CN117411092B - Active power-frequency optimization control method and system for wind-solar energy storage station - Google Patents
Active power-frequency optimization control method and system for wind-solar energy storage station Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/004—Generation forecast, e.g. methods or systems for forecasting future energy generation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to an active power-frequency optimization control method and system for a wind-solar energy storage station, wherein the method comprises the following steps: acquiring an active power control instruction at the current moment and a predicted active power value of the wind-solar field station; according to the active power control instruction and the predicted active power of the wind-light field station, adopting a partial field station priority principle to optimally allocate the active power of the wind-light storage field station and adjusting the active power control instruction of the wind-light storage field station; performing primary frequency modulation control on the wind-light storage station according to the frequency deviation, adjusting an active power control instruction of the wind-light storage station, updating the instruction into an instruction of the next moment, and outputting and executing the instruction; the above steps are cycled. Compared with the prior art, the invention can avoid the repeated adjustment of the active power of the wind-solar energy storage station and has the advantages of reducing the wind and light abandoning, improving the overall economy of the system and the like.
Description
Technical Field
The invention relates to the technical field of wind and light storage station control, in particular to a method and a system for active power-frequency optimization control of a wind and light storage station.
Background
The current wind-solar power supply has slower frequency modulation response speed, and the frequency modulation capability is limited by the current running state of the station, and the reserved spare capacity can cause the problems of wind abandoning and light abandoning to cause the new energy station to be consumed. The optimal configuration scheme of the active power in the prior art mostly adopts a mode of being distributed evenly according to rated capacity and distributed in equal proportion according to active adjustment margin, wherein the mode of being distributed evenly according to equal rated capacity is simple, and the problem of insufficient adjustment capacity of part of stations exists. The problem that the adjustment capacity of part of stations is insufficient according to the principle of average allocation of rated capacity can be solved by the allocation according to the proportion of the active adjustment allowance, but the real-time active power value of each station needs to be calculated, and the problem of economic operation index of the system is not considered.
The existing optimal control scheme aiming at wind and solar energy storage does not respectively carry out the design of a primary frequency modulation optimal control algorithm according to the increase of frequency and the decrease of frequency, only controls the frequency by single frequency modulation, and is not combined with an active power optimal configuration scheme, so that the control strategy is single, repeated adjustment is needed, and the overall operation efficiency and the economic benefit of the system are low.
Disclosure of Invention
The invention aims to overcome the problems and provides a method and a system for optimally controlling active power-frequency of a wind-solar energy storage field station.
The aim of the invention can be achieved by the following technical scheme:
An active power-frequency optimization control method for a wind-solar energy storage station comprises the following steps:
acquiring an active power control instruction at the current moment and a predicted active power value of the wind-solar field station;
According to the active power control instruction and the predicted active power of the wind-light field station, adopting a partial field station priority principle to optimally allocate the active power of the wind-light storage field station and adjusting the active power control instruction of the wind-light storage field station;
performing primary frequency modulation control on the wind-light storage station according to the frequency deviation, adjusting the active power control instruction of the wind-light storage station again, updating the instruction to be the instruction of the next moment, and outputting and executing the instruction;
and (5) circulating the steps to perform optimal control.
Further, the adjusted active power control instruction of the wind-solar energy storage station comprises an adjusted active power given value of the wind-power station, an adjusted active power given value of the photovoltaic station and an adjusted active power given value of the energy storage station;
After acquiring an active power control instruction at the current moment and a predicted active power value of the wind-solar field station, if the active power control instruction is smaller than or equal to the predicted active power value, the active power control instruction is:
when the energy storage station finishes charging, or when the energy storage station does not finish charging and the residual active power of the wind-light station is larger than the charge amount required by the energy storage station, the specific steps of the active power optimization distribution of the wind-light station are as follows:
And determining the remaining active power P loss, calculating the sum of the abandoned wind penalty cost and the abandoned light penalty cost corresponding to the wind power station and the photovoltaic station respectively as an objective function, and executing a scheme with low cost in the abandoned wind or the abandoned light.
Further, when the energy storage station finishes charging, or when the energy storage station does not finish charging and the remaining active power of the wind-light station is larger than the charging amount required by the energy storage station, in the process of optimally distributing the active power of the wind-light station, if the wind power wind-discarding cost is larger than the photovoltaic wind-discarding cost, judging whether the remaining active power P loss is larger than the photovoltaic total power generation powerIf not, the residual active power P loss is used as the photovoltaic power discarding powerConversely, the total photovoltaic power generation powerAs photovoltaic power rejectionAnd calculate the wind power electric power
In the process of optimizing and distributing active power of the wind-solar field station, if the wind power waste cost is smaller than or equal to the photovoltaic waste cost, judging whether the residual active power P loss is larger than the total power generation power of wind powerIf not, taking the residual active power P loss as wind power electric power discarding powerOtherwise, the total power of wind power is used for generatingAs wind power electric powerAnd calculate the photovoltaic power
Further, when the energy storage station finishes charging, or when the energy storage station does not finish charging and the remaining active power of the wind-light station is larger than the required charging amount of the energy storage station, the calculation process of the adjusted active power control instruction of the wind-light station specifically comprises:
If the wind power discarding cost is greater than the photovoltaic discarding cost and the residual active power P loss is greater than the total power generation The photovoltaic power and wind power at this time are:
Wherein, The total photovoltaic power;
The active power set values of the wind power station and the photovoltaic power station after adjustment are specifically:
wherein P 'wind is the adjusted active power set value of the wind power station, P' pv is the adjusted active power set value of the photovoltaic power station, For wind power rejection, P wind is the active power predicted by the wind farm, P pv is the active power predicted by the photovoltaic farm,The photovoltaic power is discarded;
If the wind power discarding cost is greater than the photovoltaic discarding cost and the residual active power P loss is less than or equal to the total photovoltaic power The photovoltaic power and wind power at this time are:
The active power set values of the wind power station and the photovoltaic power station after adjustment are specifically:
P′wind＝Pwind
If the wind power wind discarding cost is less than or equal to the photovoltaic wind discarding cost, and the residual active power P loss is greater than the total power generation power of wind power The photovoltaic power and wind power at this time are:
Wherein, The total wind power generation power is;
The active power set values of the wind power station and the photovoltaic power station after adjustment are specifically:
If the wind power wind discarding cost is less than or equal to the photovoltaic wind discarding cost and the residual active power P loss is less than or equal to the total power generation of wind power The photovoltaic power and wind power at this time are:
The active power set values of the wind power station and the photovoltaic power station after adjustment are specifically:
P′pv＝Ppv
Wherein P 'wind is the active power given value of the wind power station, and P' pv is the active power given value of the photovoltaic power station.
Further, the remaining active power is recorded as P loss,
When the energy storage station is not charged, if the remaining active power P 'of the wind-light station is larger than the required charge amount P' bess of the energy storage station, the remaining active power at the moment is as follows: p loss＝P′-P′bess;
When the energy storage station finishes charging, the remaining active power P loss is: p loss = P'.
Further, the wind curtailment cost is:
Wherein N is the number of wind power stations, and C w is the penalty cost of the abandoned wind; p W is the theoretical output of wind power; p a is the actual output of wind power;
The light discarding cost is as follows:
Wherein M is the number of photovoltaic stations, and C pv is the penalty cost of discarding light; p pv is the theoretical output of wind power; p b is the actual output of wind power.
Further, the basis for judging whether the energy storage station is charged is as follows:
Judging whether the current active power value P bess of the energy storage station is larger than or equal to the maximum charging power of the energy storage station If yes, the energy storage station is indicated to complete charging, otherwise, the energy storage station is not complete in charging;
When the energy storage station does not complete charging, if the remaining active power of the wind-solar station is larger than the required charging amount of the energy storage station, the adjusted active power set value of the energy storage station is: wherein P' bess is the amount of charge required by the energy storage station,
When the energy storage station does not complete charging, if the remaining active power of the wind-solar station is smaller than or equal to the required charging amount of the energy storage station, the adjusted active power set value of the energy storage station is: The adjusted active power set value of the wind power station is the active power set value of the wind power station of the current instruction, the adjusted active power set value of the photovoltaic power station is the active power set value of the photovoltaic power station of the current instruction, wherein P 'is the residual active power of the wind power station, P' =P wind+Ppv-Pdemand,Pdemand is the active power control instruction at the current moment, P wind is the active power predicted by the wind power station, and P pv is the active power predicted by the photovoltaic power station;
when the energy storage station finishes charging, the adjusted active power set value of the energy storage station For the active power value of the currently given energy storage station.
Further, if the active power control instruction at the current moment is larger than the predicted active power value of the wind-light station, the charging and discharging states of the energy storage station are adjusted, and the specific steps of adjusting the active power control instruction of the wind-light energy storage station are as follows:
Calculating remaining required power supply power P need＝Pdemand-Pwind-Ppv,Pdemand as an active power control instruction at the current moment, wherein P wind is active power predicted by a wind power station, P pv is active power predicted by a photovoltaic station, judging whether the energy storage station is in a charging state or a discharging state at the moment, if so, converting into the discharging state, if so, judging whether the current active power of the energy storage station is larger than the remaining required power supply power, if so, taking the remaining required power supply power P need as an adjusted active power set value of the energy storage station, and otherwise, taking the current active power value P bess of the energy storage station as an adjusted active power set value of the energy storage station.
Further, before primary frequency modulation control is executed, primary frequency modulation curves and measuring points of a wind power station, a photovoltaic station and an energy storage station are obtained first, if the difference value between the frequency of the measuring point and a reference point is smaller than a first threshold value, normal operation is carried out, if the difference value is not smaller than the first threshold value and smaller than a second threshold value, primary frequency modulation is executed, if the difference value is larger than the second threshold value, load is cut by a cutting machine, and a total switch of the measuring point is disconnected;
The primary frequency modulation is carried out in two conditions of too low frequency and too high frequency, and the active power set value of the adjusted energy storage station is adjusted again when the primary frequency modulation is carried out.
Further, when the frequency is too low, judging whether the wind power station deviates from a maximum power tracking point to operate, if yes, releasing the active power of the wind power station, judging whether the frequency meets the requirement, if yes, stopping frequency modulation, otherwise, judging whether the photovoltaic power station deviates from the maximum power tracking point, if yes, releasing the active power of the photovoltaic power station, judging whether the frequency meets the requirement, if yes, stopping frequency modulation, otherwise, starting to release electric quantity by the energy storage station, after releasing, judging whether the frequency meets the requirement, if yes, stopping frequency modulation, otherwise, performing load shedding operation until the frequency meets the requirement.
Further, when the frequency is too high, the charging power of the energy storage station is firstly adjusted up according to a primary frequency modulation curve, whether the frequency meets the requirement or not is judged, if yes, the frequency modulation is stopped, otherwise, the wind power station is started to participate in primary frequency modulation, the wind power station is controlled to deviate from a maximum power tracking point to operate, if yes, the frequency modulation is stopped, otherwise, the photovoltaic station is started to participate in primary frequency modulation, the photovoltaic station is controlled to deviate from the maximum power tracking point to operate, and if yes, the frequency modulation is stopped, otherwise, the loading operation is carried out until the frequency meets the requirement.
The invention also provides an active power-frequency optimization control system of the wind-solar energy storage field station, which comprises a data acquisition module, an active power control module and a primary frequency modulation module, wherein,
The data acquisition module is used for acquiring an active power control instruction at the current moment and a predicted active power value of the wind-solar field station;
the active power control module is used for optimally distributing the active power of the wind-light storage station by adopting a partial station priority principle according to the active power control instruction and the predicted active power of the wind-light station, and adjusting the active power control instruction of the wind-light storage station;
The primary frequency modulation module is used for carrying out primary frequency modulation control on the wind-light storage station according to the frequency deviation, adjusting the active power control instruction of the wind-light storage station again, updating the instruction to the instruction of the next moment, and outputting and executing the instruction;
the steps in the modules are circularly executed to perform optimization control.
Compared with the prior art, the invention has the following beneficial effects:
The invention provides a station control method combining active power and primary frequency modulation, wherein an optimal configuration scheme of the active power is used for separately designing a control strategy according to whether the active power value issued by scheduling is smaller than the total active power output of a wind power plant and a photovoltaic power plant, if yes, the active power is divided into energy storage to finish charging control again, active power optimal distribution of a wind-solar energy storage station is carried out, if not, the change of the energy storage station to a discharge state is regulated, the current power of the energy storage station is regulated to reach the required power supply, and then the active power control instruction of the wind-solar energy storage station is regulated by combining primary frequency modulation control. The design of the overall control strategy not only meets the requirements of the active power control and primary frequency modulation control strategies of the system, but also avoids the repeated adjustment of the active power control system, comprehensively considers factors such as the wind power/photovoltaic power generation cost, the wind abandon/light abandon punishment cost and the like of the system, and gives out the active power optimization distribution strategy under the optimal economic assessment index of the system, thereby not only meeting the economic assessment index, but also reducing the wind abandon and light abandon.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a flow chart of the present invention when the active power control command is less than or equal to the active power value of the wind-solar field station;
FIG. 3 is a flow chart of the present invention when the active power control command is greater than the active power value of the wind-solar field station;
FIG. 4 is a process diagram showing a determination of whether to perform primary frequency modulation control according to the present invention;
FIG. 5 is a primary frequency modulation response curve of a new energy station;
FIG. 6 is a flow chart of performing primary frequency modulation;
FIG. 7 is a primary frequency modulation flow chart with higher frequency;
FIG. 8 is a primary frequency modulation flow chart for low frequencies;
FIG. 9 is a simulation model topology;
FIG. 10 is a simulation model diagram based on MATLAB/Simulink construction;
FIG. 11 shows an active power and primary frequency modulation optimization control strategy built based on MATLAB/Simulink;
FIG. 12 is a 24-hour power prediction curve for a new energy station;
FIG. 13 is a partial station priority principle active power allocation strategy operating power curve;
FIG. 14 is a plot of active power change for a wind farm with increasing frequency;
FIG. 15 is a graph of active power change for a wind farm with reduced frequency.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
Example 1
The invention firstly provides an active power-frequency optimization control method of a wind-solar energy storage station, and an overall flow chart of the method is shown in figure 1. The method comprises two parts of contents, wherein the first part is a new energy station active power optimization configuration scheme. The second part is verification of the primary frequency modulation optimization control strategy of the new energy station. When the system stably operates, the active power control strategy responds to the power instruction issued by scheduling, the optimal configuration of active power is realized, when the system is subjected to frequency disturbance, the primary frequency modulation function is started according to the sequence of the stations participating in primary frequency modulation, and the primary frequency modulation purpose is achieved by correcting the active power reference value of each original new energy station.
The active power response control strategy of the new energy station is that the multi-station operation data of the new energy station is configured according to the active power control instruction issued by the power prediction system of the new energy station and the dispatching center. The operation modes are divided into three types: the method comprises the steps of distributing according to rated capacity in equal proportion, distributing according to active adjustment margin in equal proportion, and preferentially adjusting partial stations. And calculating the active power set value of the new energy station according to the operation model, and eliminating stations which do not participate in operation at the present time. Mode 1 is distributed according to rated capacity, the method is simple, but the problem of insufficient adjustment capability of part of stations can exist and the overall operation economy of the system is not considered; mode 2 is distributed according to equal proportion of active adjustment allowance, the method can solve the problem of insufficient adjustment capacity of part of stations, but real-time active power values of each station need to be calculated, and meanwhile the problem of overall operation economy of the system is not considered. The mode 3 adopts a method for adjusting the priorities of partial stations, so that repeated adjustment of an active power control system can be avoided, the adjustment time of the adjustment control system is shortened, and the priorities of the stations are determined according to the historical operation states and the current operation economical conditions of each station in the power station.
The active power control adopts a mode 3, and firstly, whether the active power value issued by the current dispatching center is larger than a power predicted value is judged according to a power predicted curve and an active power control instruction issued by the dispatching center. And if the power is larger than the preset value, the active power of the wind power station and the photovoltaic power station is fully generated, and the energy storage station supporting system is started to operate. If the energy is less than or equal to the predetermined value, judging the stored energy whether the station is charged is completed. And if the charging is completed, the remaining active power is directly subjected to wind discarding or light discarding treatment. If the charging is not completed, redundant wind and active power of the light field station are used for energy storage and charging, the problem of the new energy field station is solved, meanwhile, whether redundant generated energy exists is judged again, and if the redundant generated energy exists, wind discarding or light discarding treatment is carried out.
1. Active power control strategy
The active power control of the method provided by the invention specifically comprises the following steps: acquiring an active power control instruction at the current moment and a predicted active power value of the wind-solar field station; according to the active power control instruction and the predicted active power of the wind-light field station, adopting a partial field station priority principle to optimally allocate the active power of the wind-light storage field station and adjusting the active power control instruction of the wind-light storage field station; performing primary frequency modulation control on the wind-light storage station according to the frequency deviation, adjusting the active power control instruction of the wind-light storage station again, updating the instruction to be the instruction of the next moment, and outputting and executing the instruction; and (5) circulating the steps to perform optimal control.
The adjusted active power control instruction of the wind-solar energy storage station comprises an adjusted active power given value of the wind-power station, an adjusted active power given value of the photovoltaic station and an adjusted active power given value of the energy storage station.
After acquiring an active power control instruction at the current moment and a predicted active power value of the wind-solar field station, if the active power control instruction is smaller than or equal to the predicted active power value, the active power control instruction is:
when the energy storage station finishes charging, or when the energy storage station does not finish charging and the residual active power of the wind-light station is larger than the charge amount required by the energy storage station, the specific steps of the active power optimization distribution of the wind-light station are as follows:
And determining the remaining active power P loss, calculating the sum of the abandoned wind penalty cost and the abandoned light penalty cost corresponding to the wind power station and the photovoltaic station respectively as an objective function, and executing a scheme with low cost in the abandoned wind or the abandoned light.
When the energy storage station finishes charging, or when the energy storage station does not finish charging and the remaining active power of the wind-light station is larger than the charging amount required by the energy storage station, in the process of optimally distributing the active power of the wind-light station, if the wind power discarding cost is larger than the photovoltaic discarding cost, judging whether the remaining active power P loss is larger than the photovoltaic total power generation powerIf not, the residual active power P loss is used as the photovoltaic power discarding powerConversely, the total photovoltaic power generation powerAs photovoltaic power rejectionAnd calculate the wind power electric power
In the process of optimizing and distributing active power of the wind-solar field station, if the wind power waste cost is smaller than or equal to the photovoltaic waste cost, judging whether the residual active power P loss is larger than the total power generation power of wind powerIf not, taking the residual active power P loss as wind power electric power discarding powerOtherwise, the total power of wind power is used for generatingAs wind power electric powerAnd calculate the photovoltaic power
And obtaining an active power control instruction of the adjusted wind-solar field station according to the calculated power discarding power. Meanwhile, the remaining active power is recorded as P loss,
When the energy storage station does not complete charging, if the remaining active power of the wind-solar station is smaller than or equal to the required charging amount of the energy storage station, the adjusted active power set value of the energy storage station is: The adjusted active power set value of the wind power station is the active power set value of the wind power station of the current instruction, the adjusted active power set value of the photovoltaic power station is the active power set value of the photovoltaic power station of the current instruction, wherein P 'is the residual active power of the wind power station, P' =P wind+Ppv-Pdemand,Pdemand is the active power control instruction at the current moment, P wind is the active power predicted by the wind power station, and P pv is the active power predicted by the photovoltaic power station.
When the energy storage station is not charged, if the remaining active power P 'of the wind-light station is larger than the required charge amount P' bess of the energy storage station, the remaining active power at the moment is as follows: p loss＝P′-P′bess;
When the energy storage station finishes charging, the remaining active power P loss is: p loss = P'.
If the active power control instruction at the current moment is larger than the predicted active power value of the wind-light field station, the charging and discharging states of the energy storage field station are adjusted, and the specific steps of adjusting the active power control instruction of the wind-light energy storage field station are as follows:
Calculating remaining required power supply power P need＝Pdemand-Pwind-Ppv,Pdemand as an active power control instruction at the current moment, wherein P wind is active power predicted by a wind power station, P pv is active power predicted by a photovoltaic station, judging whether the energy storage station is in a charging state or a discharging state at the moment, if so, converting into the discharging state, if so, judging whether the current active power of the energy storage station is larger than the remaining required power supply power, if so, taking the remaining required power supply power P need as an adjusted active power set value of the energy storage station, and otherwise, taking the current active power value P bess of the energy storage station as an adjusted active power set value of the energy storage station.
According to the above procedure, 9 cases of power control can be obtained. Before analyzing these situations, first, an active power control instruction and a predicted active power value P demand of the wind-solar field station at the current moment are obtained, the active power of the predicted wind-solar field station at the current moment is P wind, the active power of the predicted photovoltaic field station at the current moment is P pv, and the active power value of the given energy storage field station at the current moment is P bess. All cases of active power control are then analyzed in sequence:
First, whether or not equation 1 is established:
Pwind+Ppv≥Pdemand (1)
if so, judging whether the stored energy is charged. The active power control flow after the establishment of equation 1 is shown in fig. 2. Calculating the current charge quantity of the energy storage station, and assuming that the maximum charge power of the energy storage station is And judging whether the current active power value of the energy storage station meets the requirement of a formula 2.
1. If the formula 2 is satisfied, it is explained that the charging of the energy storage station is not completed, and the charge amount P 'bess required by the current energy storage station and the remaining power P' of the current new energy station are calculated.
P′＝Pwind+Ppv-Pdemand (4)
Next, judging whether the current required charge amount P 'bess of the energy storage station is greater than or equal to the current residual electric quantity P' of the new energy station:
P′bess≥P′ (5)
1.1 if formula (5) is satisfied, and is the first case at this time, then all remaining active power of the wind farm and the photovoltaic farm are used for energy storage farm charging, and the current energy storage charge (i.e. the adjusted given energy storage farm active power) is:
at this time, the adjusted given power of the instructed wind power station is the current given power of the wind power station, and the adjusted given active power of the instructed energy storage station is the current charge amount of the energy storage station
1.2 If equation (5) is not satisfied, the current energy storage station charge is:
At this time, the remaining power generation amount P loss of the new energy station is also required to be calculated for the wind-discarding or light-discarding process.
The remaining power generation amount P loss is: p loss＝P′-P′bess.
According to the wind discarding penalty cost of the current wind station and the photovoltaic station as an objective function, whether the wind discarding cost or the light discarding cost is low in the current running state is given.
Objective function:
min{F′wind+F′pv} (9)
Wherein F 'wind is the wind-discarding penalty cost, and F' pv is the light-discarding penalty cost.
And if the wind power station discarding cost is greater than the light Fu Changzhan discarding cost, preferentially discarding the light. And if the wind power station waste wind cost is smaller than the photovoltaic station waste light cost, preferentially waste wind.
The wind abandoning punishment cost is calculated according to the formula (10),
Wherein, C w is the wind abandon punishment cost; p W is the theoretical output of wind power; p a is the actual output of wind power.
The light rejection penalty cost is calculated according to equation (11),
Wherein, C pv is the light discarding punishment cost; p pv is the theoretical output of wind power; p b is the actual output of wind power.
1.2.1 Assuming that the wind power wind curtailment cost is greater than the photovoltaic curtailment, then
Assuming that the total power generation of the photovoltaic isThe total power generation amount of wind power is
1.2.1.1 Judges whether the remaining active power is equal to or less than the total photovoltaic power, that is, whether the formula (13) is satisfied. If the system requirement is not met, the second condition is that the system requirement cannot be met only by the waste light, and the waste wind treatment is needed, and then:
At this time, the active power set values of the adjusted wind power station and photovoltaic station are:
meanwhile, the adjusted given power of the energy storage station is the current energy storage charge amount:
That is, when the energy storage station is not charged, and the remaining active power of the wind-light station is larger than the charging amount required by energy storage, if the wind power wind-discarding cost is larger than the photovoltaic light-discarding cost, and the remaining active power is larger than the photovoltaic total power generation power, the updated instruction is shown in the above five formulas.
1.2.1.2 If equation (13) is satisfied, the photovoltaic power is:
at the moment, the wind power abandons the electric power
The active power set values of the wind power station and the photovoltaic station adjusted at this time are:
P′wind＝Pwind
meanwhile, the energy storage station gives active power as the current energy storage charge amount:
1.2.2 assume that the photovoltaic curtailment cost is greater than the wind curtailment cost:
Judging whether the residual active power is less than or equal to the total wind power generation power, namely whether the formula (18) is satisfied,
1.2.2.1 If the formula (18) is not satisfied, the third case indicates that the system requirement cannot be satisfied by only using the waste wind, and the waste light treatment is needed, then:
at this time, the adjusted active power set values of the wind power station and the photovoltaic station are as follows:
meanwhile, the adjusted energy storage given active power is the current energy storage charge amount, and is as follows:
1.2.2.2 if the formula (18) is satisfied, in this case, the fourth case indicates that only wind is discarded, and the wind power is discarded as follows:
Photovoltaic power rejection at this time The active power set values of the wind power station and the photovoltaic station adjusted at the moment are:
P′pv＝Ppv
Meanwhile, the energy storage station gives active power as the current energy storage charge amount, which is:
2. returning to the judgment of the formula 2, if the formula 2 is satisfied, the completion of energy storage and charging is illustrated, and at the moment, the wind-solar active power optimization distribution is performed by adopting a partial station priority principle. When charging is completed, the set active power of the adjusted energy storage station is not changed.
When the charging is completed, the charging is not needed, and the wind and/or the light are/is abandoned directly, so that the residual generating capacity P loss is: p loss＝P′.P′＝Pwind+Ppv-Pdemand.
2.1, If the wind power waste cost is larger than the photovoltaic waste cost, judging whether the residual active power is smaller than or equal to the total photovoltaic power generation power, namely whether the formula (13) is satisfied.
2.1.1 If not satisfied, in this case, the fifth case indicates that the system requirement cannot be satisfied by only discarding light, and the wind discarding treatment is also required, then:
at this time, the adjusted active power set values of the wind power station and the photovoltaic station are as follows:
meanwhile, the adjusted energy storage given active power is still the current active power value of the given energy storage power station and is not changed.
2.1.2 If equation (13) is satisfied, in this case, in the sixth case, the photovoltaic power is:
at the moment, the wind power abandons the electric power
The active power set values of the wind power station and the photovoltaic power station after adjustment at the moment are:
P′wind＝Pwind
Meanwhile, the adjusted energy storage given power is still the current active power value of the given energy storage power station and is unchanged.
2.2, Supposing that the photovoltaic waste light cost is greater than the wind power waste wind cost:
Judging whether the residual active power is less than or equal to the total wind power generation power, namely whether the formula (18) is satisfied,
2.2.1 If the formula (18) is not satisfied, in this case, the seventh case indicates that the system requirement cannot be satisfied by only using the waste wind, and the waste light treatment is needed, where:
At this time, the active power set values of the adjusted wind power station and photovoltaic station are:
meanwhile, the given power of the stored energy is still the current active power value of the given energy storage station, and the active power value is not changed.
2.2.2 If the formula (18) is satisfied, in this case, the eighth case indicates that only wind is discarded, and the wind power is discarded as follows:
Photovoltaic power rejection at this time The active power set values of the wind power station and the photovoltaic power station after adjustment at the moment are:
P′pv＝Ppv
meanwhile, the given power of the stored energy is still the current active power value of the given energy storage station, and the active power value is not changed.
Next, consider the last case, namely, the ninth case, that is, the case where expression 1 does not hold, and the active power control flow after the case where expression 1 does not hold is shown in fig. 3. The wind power station and the photovoltaic station operate according to the full distribution of the power prediction curve, and at the moment, the predicted active power of the wind power station and the photovoltaic station is as follows:
Meanwhile, calculating a current active power control instruction issued according to scheduling and the current running states of the wind power station and the photovoltaic station, and calculating the residual required power supply quantity:
Pneed＝Pdemand-Pwind-Ppv (26)
and judging the running state of the energy storage station, and if the energy storage station is in a charging state, stopping charging and switching to a discharging mode. If the energy storage station is in the discharge mode, judging whether the current discharge power meets the requirement.
Assuming that the current electric quantity of the energy storage station is P bess, judging that P bess≥Pneed meets the requirement, setting the energy storage given active power as P' bess, and adjusting the energy storage given power as follows:
p' bess＝Pneed (27) if P bess≤Pneed, the adjusted stored energy given power is:
P′bess＝Pbess (28)
At the moment, the given active power values of the wind power station and the photovoltaic station are unchanged and still are the given active power values of the current instruction.
All that is said is the case of an active power strategy.
2. Primary frequency modulation control
The invention is based on the active power strategy, and performs primary frequency modulation control on the stored energy given power output by the active power strategy. Before execution, a process of determining whether to execute primary frequency modulation control is first performed as shown in fig. 4. As shown in fig. 4, the primary frequency modulation judgment basis of the new energy station is shown. Firstly, setting a primary frequency modulation curve and a measurement point of a wind power station, a photovoltaic station and an energy storage station. As shown in fig. 5, the primary frequency modulation response curve of the new energy station is shown. Wherein, P 0 outputs active power for the current new energy station. P N is the rated active power of the new energy station; in some embodiments, the new energy station is specified to up-regulate the maximum power value to 0.06P N, down-regulate the maximum power value to 0.1P N, and the new energy station participates in primary frequency modulation to meet the requirement that the active power output is greater than 0.2P N.
Next, it is determined whether the grid-tie frequency exceeds the primary frequency modulation range, and in some embodiments of the present invention, the primary frequency modulation is not started when the frequency deviation is less than or equal to + -0.05 Hz, as shown in FIG. 4. When the frequency deviation is between 48Hz and 49.95Hz and 50.05Hz to 51.5Hz, a primary frequency modulation function is started. When the frequency is less than 48Hz and greater than 51.5Hz, the cutting machine cuts the load. And when primary frequency modulation is not started, directly executing the power instruction output by the active power control.
The flow of performing primary frequency modulation is shown in fig. 6. When the frequency meets 48 Hz-49.95 Hz and 50.05 Hz-51.5 Hz, the new energy station starts primary frequency modulation control and sets the station participating in primary frequency modulation. When the frequency of the grid-connected point is higher, the station transmits a power-down operation instruction and formulates a power-down operation control strategy, and the scheme adopts an operation strategy of energy storage priority, light Fu Di II, wind power third and load last. When the frequency of the grid-connected point is lower, the station transmits a power-up operation instruction and formulates a power-up operation control strategy, and the scheme adopts a wind power priority, light Fu Di two, energy storage third and load last operation strategy to ensure that the system always operates in an economic optimal state. And during primary frequency modulation, correcting the output adjusted energy storage active power set value. Performing primary frequency modulation time division into two cases:
1. The primary frequency modulation flow with higher frequency is shown in fig. 7. Assuming that the frequency of the new energy station grid-connected point is higher, the system needs to operate with reduced power at the moment, and the energy storage and charging power is firstly adjusted upwards according to a primary frequency modulation curve, and the adjustment time is generally 15 seconds. After 15 seconds, storing energy, exiting primary frequency modulation, judging whether the system grid-connected point frequency meets the assessment requirement or not again, if the frequency is regulated to a stable value, exiting the primary frequency modulation, if the frequency is still higher, starting a wind power station to participate in the primary frequency modulation, regulating time is 15 seconds as well, if the frequency is restored to an initial value, exiting the primary frequency modulation, if the frequency is still higher, starting a photovoltaic station to participate in the primary frequency modulation, enabling the photovoltaic station to deviate from a maximum power tracking point, and if the frequency is still higher, starting load increasing operation, and regulating the system grid-connected point frequency after the regulation time is 10 seconds and the regulation time is 10 seconds.
2. The primary frequency modulation flow with lower frequency is shown in fig. 8. If the frequency of the grid-connected point is lower, the station will send out a power-up operation instruction and formulate a power-up operation control strategy. Under the condition of meeting the principle of optimal economy, the scheme adopts a control strategy of wind power priority, light Fu Di II, third energy storage and final load. In detail, firstly judging whether the wind power station operates deviating from the maximum power tracking point, if so, releasing the active power of the wind power station, and if the frequency at the moment does not meet the requirement, judging whether the photovoltaic station deviates from the maximum power tracking point. If so, releasing the active power of the photovoltaic station, if the frequency checking requirement is not met at the moment, starting to release the electric quantity of the energy storage station, and if the frequency checking requirement is not met at the moment, reducing the load operation.
According to the primary frequency modulation optimization control scheme of the new energy station, frequency up-regulation limit and frequency down-regulation limit can be set according to different examination requirements of the system, and control logic is realized by separating frequency rising and frequency falling according to the frequency deviation of grid-connected points. If the frequency is higher, the system needs to be operated with reduced power, and at the moment, the wind/light field station is preferably adopted to deviate from the maximum power tracking point, so that the frequency modulation requirement is met, meanwhile, the problems of wind abandonment and excessive light abandonment of the system are avoided, and the problem of the absorption of the new energy field station is solved. When the frequency is low, whether the wind/light field station is in maximum power operation is preferentially considered, and the kinetic energy of the rotor is released to finish the adjustment of the frequency of the system, so that the system operates under the condition of optimal economy. Meanwhile, by combining with a new energy station active power optimization control strategy, the whole system operates on an economical optimization principle, and if the occurrence frequency is suddenly high and suddenly low in the adjustment process, the two control models can be freely switched. The scheme not only meets the frequency modulation requirement of the system, but also meets the economic evaluation index of the system.
In both cases, when primary frequency modulation control is required, the power command of any case of active power control can be combined.
Simulation verification of the method of the present invention is performed as follows. A system simulation model is built by adopting an MATLAB/Simulink simulation platform, and is used for a model wind power plant, a photovoltaic power station, an energy storage power station, an SVG reactive power compensation device, a load, a boost converter, a collection line, a large power grid model and the like. The wind power plant is connected with a 35kV power grid in parallel by N W2500-106 wind power stations, and then is connected with the power grid through a 35kV/220kV step-up transformer, and the maximum power which can be generated is 10MW. The photovoltaic power station is formed by connecting 50 average value models of 100kW arrays in parallel, wherein a single photovoltaic field station is connected to a 35kV power grid through a DC-DC boost converter and a three-phase three-level VSC. And meanwhile, the maximum power tracking is realized by adopting a BOOST converter. The energy storage station model can consider dynamic characteristics in the charging and discharging process of the storage battery. When the wind-solar energy storage source is in complementary hybrid grid-connected operation, the frequency is supported by an external power grid, and the storage battery can adopt a proper control strategy to inhibit active fluctuation output by the wind driven generator and the photovoltaic array; when the power grid is in island operation, the storage battery is used as a main control unit, and the active power output and the reactive power output of the storage battery are regulated at the same time, so that the stability of voltage and frequency is maintained. The simulation model topology is shown in fig. 9. A simulation model built based on MATLAB/Simulink is shown in FIG. 10. The active power and primary frequency modulation optimization control strategy built based on MATLAB/Simulink is shown in FIG. 11. The rate prediction curve obtained based on the above model is shown in fig. 12.
As shown in fig. 12, the power prediction curve of the new energy station for 24 hours includes a new energy station grid-connected point internet power prediction curve, a wind power station active power prediction curve, a photovoltaic station active power prediction curve, an energy storage station power prediction curve and a load power prediction curve which are issued by scheduling. According to the given value, the optimal configuration of active power is realized through the partial station priority principle.
The partial station priority principle active power allocation strategy is shown in fig. 13. Fig. 13 shows the results of realizing active power distribution of the new energy station by adopting a partial station priority principle for solving the problem of new energy station digestion based on an economical optimum operation mode, and from simulation results, the actual internet power of the wind power station, the wind curtailed power, the actual internet power of the photovoltaic power station, the light curtailed power, the operation power curve of the energy storage station and the like can be seen.
The frequency increases, the active power change curve of the wind power station is shown in fig. 14, the frequency decreases, and the active power change curve of the wind power station is shown in fig. 15.
The invention provides a new energy station active power optimization control strategy based on an economic optimal operation mode and a partial station priority principle for solving the new energy station consumption problem, and simultaneously provides different frequency modulation optimization control strategies according to different operation conditions of a system and combining higher/lower system frequency. The optimal configuration scheme of the active power is used for separately designing a control strategy according to whether the active power value issued by the scheduling is larger or smaller than the total active power output of the wind power station and the photovoltaic station. And the primary frequency modulation response control strategy is designed by considering the strategy separately according to the two conditions of higher frequency and lower frequency. The design of the overall control strategy not only meets the requirements of active power control and primary frequency modulation control strategies of the system, but also avoids repeated adjustment of the active power control system, reduces the response time of the adjustment control system, comprehensively considers factors such as wind power/photovoltaic power generation cost, wind discarding/light discarding punishment cost and the like of the system, gives out an active power optimization distribution strategy under the optimal economic assessment index of the system, meets the economic assessment index, and solves the problems of wind discarding and light discarding of the system.
Example 2
In another aspect of the present invention, a corresponding active power-frequency optimization control system for a wind-solar energy storage station is provided based on the active power-frequency optimization control method for a wind-solar energy storage station in embodiment 1, where the system can implement the method in embodiment 1.
The system may include a data acquisition module, an active power control module, and a primary frequency modulation module, wherein,
The data acquisition module is used for acquiring an active power control instruction at the current moment and a predicted active power value of the wind-solar field station;
the active power control module is used for optimally distributing the active power of the wind-light storage station by adopting a partial station priority principle according to the active power control instruction and the predicted active power of the wind-light station, and adjusting the active power control instruction of the wind-light storage station;
The primary frequency modulation module is used for carrying out primary frequency modulation control on the wind-light storage station according to the frequency deviation, adjusting the active power control instruction of the wind-light storage station again, updating the instruction to the instruction of the next moment, and outputting and executing the instruction;
the steps in the modules are circularly executed to perform optimization control.
After the data acquisition module acquires the active power control instruction at the current moment and the predicted active power value of the wind-light field station, the acquired data are transmitted to the active power control module, the active power control module optimally distributes the active power of the wind-light storage field station, then the active power control instruction of the wind-light storage field station after adjustment is output to the primary frequency modulation module, and the primary frequency modulation module adjusts the active power control instruction of the wind-light storage field station after adjustment again.
Example 3
In another aspect of the present invention, a corresponding active power-frequency optimization control system for a wind-solar energy storage station is provided based on the active power-frequency optimization control method for a wind-solar energy storage station in embodiment 1, where the system can implement the method in embodiment 1. The system of the present invention includes a processor, an internal bus, a network interface, memory, and non-volatile storage, although other services may be required. The processor reads the corresponding computer program from the nonvolatile memory into the memory and then runs the same to implement the method of optimizing control described in the flowchart of fig. 1. Of course, other implementations, such as logic devices or combinations of hardware and software, are not excluded from the present invention, that is, the execution subject of the following processing flows is not limited to each logic unit, but may be hardware or logic devices.
The embodiments of the present invention are described in a progressive manner, and the same and similar parts of the embodiments are all referred to each other, and each embodiment is mainly described in the differences from the other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (20)
1. The active power-frequency optimization control method for the wind-solar energy storage station is characterized by comprising the following steps of:
acquiring an active power control instruction at the current moment and a predicted active power value of the wind-solar field station;
According to the active power control instruction and the predicted active power of the wind-light field station, adopting a partial field station priority principle to optimally allocate the active power of the wind-light storage field station and adjusting the active power control instruction of the wind-light storage field station;
performing primary frequency modulation control on the wind-light storage station according to the frequency deviation, adjusting the active power control instruction of the wind-light storage station again, updating the instruction to be the instruction of the next moment, and outputting and executing the instruction;
The steps are circulated to perform optimization control;
the active power control instruction of the wind-solar energy storage station after the first adjustment comprises an adjusted active power given value of the wind-power station, an adjusted active power given value of the photovoltaic station and an adjusted active power given value of the energy storage station;
After acquiring an active power control instruction at the current moment and a predicted active power value of the wind-solar field station, if the active power control instruction is smaller than or equal to the predicted active power value, the active power control instruction is:
when the energy storage station finishes charging, or when the energy storage station does not finish charging and the residual active power of the wind-light station is larger than the charge amount required by the energy storage station, the specific steps of the active power optimization distribution of the wind-light station are as follows:
And determining the remaining active power P loss, calculating the sum of the abandoned wind penalty cost and the abandoned light penalty cost corresponding to the wind power station and the photovoltaic station respectively as an objective function, and executing a scheme with low cost in the abandoned wind or the abandoned light.
2. The method for optimizing and controlling active power and frequency of a wind-light energy storage station according to claim 1, wherein when the energy storage station is charged, or when the energy storage station is not charged and the remaining active power of the wind-light station is larger than the charging amount required by the energy storage station, in the process of optimizing and distributing the active power of the wind-light energy storage station, if the wind-power wind-discarding cost is larger than the photovoltaic wind-discarding cost, judging whether the remaining active power P loss is larger than the photovoltaic total generated powerIf not, the residual active power P loss is used as the photovoltaic power discarding powerConversely, the total photovoltaic power generation powerAs photovoltaic power rejectionAnd calculate the wind power electric power
In the process of optimizing and distributing active power of the wind-solar field station, if the wind power waste cost is smaller than or equal to the photovoltaic waste cost, judging whether the residual active power P loss is larger than the total power generation power of wind powerIf not, taking the residual active power P loss as wind power electric power discarding powerOtherwise, the total power of wind power is used for generatingAs wind power electric powerAnd calculate the photovoltaic power
3. The method for optimizing and controlling the active power and the frequency of the wind-light energy storage station according to claim 2, wherein when the energy storage station finishes charging or when the energy storage station does not finish charging and the remaining active power of the wind-light station is larger than the charging amount required by the energy storage station, the calculation process of the adjusted active power control instruction of the wind-light station is specifically as follows:
If the wind power discarding cost is greater than the photovoltaic discarding cost and the residual active power P loss is greater than the total power generation The photovoltaic power and wind power at this time are:
Wherein, The total photovoltaic power;
The active power set values of the wind power station and the photovoltaic power station after adjustment are specifically:
Wherein P' wind is the adjusted active power set value of the wind power station, P p′v is the adjusted active power set value of the photovoltaic power station, For wind power rejection, P wind is the active power predicted by the wind farm, P pv is the active power predicted by the photovoltaic farm,The photovoltaic power is discarded;
If the wind power discarding cost is greater than the photovoltaic discarding cost and the residual active power P loss is less than or equal to the total photovoltaic power The photovoltaic power and wind power at this time are:
The active power set values of the wind power station and the photovoltaic power station after adjustment are specifically:
P′wind＝Pwind
If the wind power wind discarding cost is less than or equal to the photovoltaic wind discarding cost, and the residual active power P loss is greater than the total power generation power of wind power The photovoltaic power and wind power at this time are:
Wherein, The total wind power generation power is;
The active power set values of the wind power station and the photovoltaic power station after adjustment are specifically:
If the wind power wind discarding cost is less than or equal to the photovoltaic wind discarding cost and the residual active power P loss is less than or equal to the total power generation of wind power The photovoltaic power and wind power at this time are:
The active power set values of the wind power station and the photovoltaic power station after adjustment are specifically:
P′pv＝Ppv
Wherein P' wind is the active power given value of the wind power station, and P p′v is the active power given value of the photovoltaic power station.
4. The method for optimizing and controlling the active power-frequency of the wind-solar energy storage field station according to claim 3, wherein the remaining active power is recorded as P loss,
When the energy storage station is not charged, if the remaining active power P 'of the wind-light station is larger than the required charge amount P' bess of the energy storage station, the remaining active power at the moment is as follows: p loss＝P′-P′bess;
When the energy storage station finishes charging, the remaining active power P loss is: p loss = P'.
5. The method for optimizing and controlling the active power-frequency of the wind-solar energy storage field station according to claim 3, wherein the wind curtailment cost is as follows:
Wherein N is the number of wind power stations, and C w is the penalty cost of the abandoned wind; p W is the theoretical output of wind power; p a is the actual output of wind power;
The light discarding cost is as follows:
Wherein M is the number of photovoltaic stations, and C pv is the penalty cost of discarding light; p pv is the theoretical output of wind power; p b is the actual output of wind power.
6. The method for optimizing and controlling the active power and the frequency of the wind-solar energy storage station according to claim 1, wherein the basis for judging whether the energy storage station is charged is as follows:
Judging whether the current active power value P bess of the energy storage station is larger than or equal to the maximum charging power of the energy storage station If yes, the energy storage station is indicated to complete charging, otherwise, the energy storage station is not complete in charging;
When the energy storage station does not complete charging, if the remaining active power of the wind-solar station is larger than the charging amount required by the energy storage station,
The active power set value of the energy storage station after adjustment at this time is: wherein P' bess is the amount of charge required by the energy storage station,
When the energy storage station does not complete charging, if the remaining active power of the wind-solar station is smaller than or equal to the required charging amount of the energy storage station, the adjusted active power set value of the energy storage station is: The adjusted active power set value of the wind power station is the active power set value of the wind power station of the current instruction, the adjusted active power set value of the photovoltaic power station is the active power set value of the photovoltaic power station of the current instruction, wherein P 'is the residual active power of the wind power station, P' =P wind+Ppv-Pdemand,Pdemand is the active power control instruction at the current moment, P wind is the active power predicted by the wind power station, and P pv is the active power predicted by the photovoltaic power station;
when the energy storage station finishes charging, the adjusted active power set value of the energy storage station For the active power value of the currently given energy storage station.
7. The method for optimizing control over active power and frequency of a wind-solar energy storage station according to claim 1, wherein if the active power control command at the current moment is larger than the predicted active power value of the wind-solar station, the charging and discharging states of the energy storage station are adjusted, and the specific steps of adjusting the active power control command of the wind-solar energy storage station are as follows:
Calculating remaining required power supply power P need＝Pdemand-Pwind-Ppv,Pdemand as an active power control instruction at the current moment, wherein P wind is active power predicted by a wind power station, P pv is active power predicted by a photovoltaic station, judging whether the energy storage station is in a charging state or a discharging state at the moment, if so, converting into the discharging state, if so, judging whether the current active power of the energy storage station is larger than the remaining required power supply power, if so, taking the remaining required power supply power P need as an adjusted active power set value of the energy storage station, and otherwise, taking the current active power value P bess of the energy storage station as an adjusted active power set value of the energy storage station.
8. The method for optimizing and controlling the active power and the frequency of the wind-solar energy storage station according to claim 1, wherein before primary frequency modulation control is executed, primary frequency modulation curves and measuring points of the wind power station, the photovoltaic station and the energy storage station are acquired firstly, if the difference value between the frequency of the measuring point and a reference point is smaller than a first threshold value, normal operation is judged, if the difference value is not smaller than the first threshold value and smaller than a second threshold value, primary frequency modulation is executed, if the difference value is larger than the second threshold value, load is cut off by a cutting machine, and a main switch of the measuring point is disconnected;
The primary frequency modulation is carried out in two conditions of too low frequency and too high frequency, and the active power set value of the adjusted energy storage station is adjusted again when the primary frequency modulation is carried out.
9. The method for optimizing control of active power and frequency of a wind-solar energy storage station according to claim 8, wherein when the frequency is too low, judging whether the wind-solar energy storage station deviates from a maximum power tracking point to operate, if yes, releasing the active power of the wind-solar energy storage station, judging whether the frequency meets the requirement, if yes, stopping frequency modulation, otherwise, judging whether the photovoltaic station deviates from the maximum power tracking point, if yes, releasing the active power of the photovoltaic station, judging whether the frequency meets the requirement, if yes, stopping frequency modulation, otherwise, starting releasing electric quantity by the energy storage station, after releasing, judging whether the frequency meets the requirement, if yes, stopping frequency modulation, otherwise, reducing load operation until the frequency meets the requirement.
10. The method for optimizing and controlling the active power and the frequency of the wind-solar energy storage station according to claim 8 is characterized in that when the frequency is too high, the charging power of the energy storage station is firstly adjusted up according to a primary frequency modulation curve, whether the frequency meets the requirement or not is judged, if yes, the frequency modulation is stopped, otherwise, the wind power station is started to participate in primary frequency modulation, the wind power station is controlled to run away from a maximum power tracking point, whether the frequency meets the requirement or not is judged, if yes, the wind power station is stopped, otherwise, the photovoltaic station is started to participate in primary frequency modulation, the photovoltaic station is controlled to run away from the maximum power tracking point, whether the frequency meets the requirement or not is judged, if yes, the frequency modulation is stopped, otherwise, the loading operation is stopped, and the frequency meets the requirement.
11. The active power-frequency optimization control system of the wind-solar energy storage station is characterized by comprising a data acquisition module, an active power control module and a primary frequency modulation module, wherein,
The data acquisition module is used for acquiring an active power control instruction at the current moment and a predicted active power value of the wind-solar field station;
the active power control module is used for optimally distributing the active power of the wind-light storage station by adopting a partial station priority principle according to the active power control instruction and the predicted active power of the wind-light station, and adjusting the active power control instruction of the wind-light storage station;
The primary frequency modulation module is used for carrying out primary frequency modulation control on the wind-light storage station according to the frequency deviation, adjusting the active power control instruction of the wind-light storage station again, updating the instruction to the instruction of the next moment, and outputting and executing the instruction;
The steps in the modules are circularly executed to perform optimization control;
the active power control instruction of the wind-solar energy storage station after the first adjustment comprises an adjusted active power given value of the wind-power station, an adjusted active power given value of the photovoltaic station and an adjusted active power given value of the energy storage station;
After acquiring an active power control instruction at the current moment and a predicted active power value of the wind-solar field station, if the active power control instruction is smaller than or equal to the predicted active power value, the active power control instruction is:
when the energy storage station finishes charging, or when the energy storage station does not finish charging and the residual active power of the wind-light station is larger than the charge amount required by the energy storage station, the specific steps of the active power optimization distribution of the wind-light station are as follows:
And determining the remaining active power P loss, calculating the sum of the abandoned wind penalty cost and the abandoned light penalty cost corresponding to the wind power station and the photovoltaic station respectively as an objective function, and executing a scheme with low cost in the abandoned wind or the abandoned light.
12. The system according to claim 11, wherein when the energy storage station is charged, or when the energy storage station is not charged and the remaining active power of the wind-solar station is greater than the charge amount required by the energy storage station, in the process of optimally distributing the active power of the wind-solar station, if the wind power wind-curtailed cost is greater than the photovoltaic wind-curtailed cost, it is determined whether the remaining active power P loss is greater than the photovoltaic total generated powerIf not, the residual active power P loss is used as the photovoltaic power discarding powerConversely, the total photovoltaic power generation powerAs photovoltaic power rejectionAnd calculate the wind power electric power
In the process of optimizing and distributing active power of the wind-solar field station, if the wind power waste cost is smaller than or equal to the photovoltaic waste cost, judging whether the residual active power P loss is larger than the total power generation power of wind powerIf not, taking the residual active power P loss as wind power electric power discarding powerOtherwise, the total power of wind power is used for generatingAs wind power electric powerAnd calculate the photovoltaic power
13. The active power-frequency optimization control system of a wind-light energy storage station according to claim 11, wherein when the energy storage station finishes charging or when the energy storage station does not finish charging and the remaining active power of the wind-light station is greater than the required charging amount of the energy storage station, the calculation process of the adjusted active power control instruction of the wind-light station specifically comprises:
If the wind power discarding cost is greater than the photovoltaic discarding cost and the residual active power P loss is greater than the total power generation The photovoltaic power and wind power at this time are:
Wherein, The total photovoltaic power;
The active power set values of the wind power station and the photovoltaic power station after adjustment are specifically:
wherein P 'wind is the adjusted active power set value of the wind power station, P' pv is the adjusted active power set value of the photovoltaic power station, For wind power rejection, P wind is the active power predicted by the wind farm, P pv is the active power predicted by the photovoltaic farm,The photovoltaic power is discarded;
If the wind power discarding cost is greater than the photovoltaic discarding cost and the residual active power P loss is less than or equal to the total photovoltaic power The photovoltaic power and wind power at this time are:
The active power set values of the wind power station and the photovoltaic power station after adjustment are specifically:
P′wind＝Pwind
If the wind power wind discarding cost is less than or equal to the photovoltaic wind discarding cost, and the residual active power P loss is greater than the total power generation power of wind power The photovoltaic power and wind power at this time are:
Wherein, The total wind power generation power is;
The active power set values of the wind power station and the photovoltaic power station after adjustment are specifically:
If the wind power wind discarding cost is less than or equal to the photovoltaic wind discarding cost and the residual active power P loss is less than or equal to the total power generation of wind power The photovoltaic power and wind power at this time are:
The active power set values of the wind power station and the photovoltaic power station after adjustment are specifically:
Pp′v＝Ppv
Wherein P 'wind is the active power given value of the wind power station, and P' pv is the active power given value of the photovoltaic power station.
14. The wind-solar energy storage station active power-frequency optimization control system according to claim 13, wherein the remaining active power is recorded as P loss,
When the energy storage station is not charged, if the remaining active power P 'of the wind-light station is larger than the required charge amount P' bess of the energy storage station, the remaining active power at the moment is as follows: p loss＝P′-Pb′ess;
When the energy storage station finishes charging, the remaining active power P loss is: p loss = P'.
15. The active power-frequency optimization control system of a wind-solar energy storage station according to claim 13, wherein the wind curtailment cost is:
Wherein N is the number of wind power stations, and C w is the penalty cost of the abandoned wind; p W is the theoretical output of wind power; p a is the actual output of wind power;
The light discarding cost is as follows:
Wherein M is the number of photovoltaic stations, and C pv is the penalty cost of discarding light; p pv is the theoretical output of wind power; p b is the actual output of wind power.
16. The wind-solar energy storage station active power-frequency optimization control system according to claim 11, wherein the basis for judging whether the energy storage station is charged is as follows:
Judging whether the current active power value P bess of the energy storage station is larger than or equal to the maximum charging power of the energy storage station If yes, the energy storage station is indicated to complete charging, otherwise, the energy storage station is not complete in charging;
When the energy storage station does not complete charging, if the remaining active power of the wind-solar station is larger than the charging amount required by the energy storage station,
The active power set value of the energy storage station after adjustment at this time is: wherein P' bess is the amount of charge required by the energy storage station,
When the energy storage station does not complete charging, if the remaining active power of the wind-solar station is smaller than or equal to the required charging amount of the energy storage station, the adjusted active power set value of the energy storage station is: The adjusted active power set value of the wind power station is the active power set value of the wind power station of the current instruction, the adjusted active power set value of the photovoltaic power station is the active power set value of the photovoltaic power station of the current instruction, wherein P 'is the residual active power of the wind power station, P' =P wind+Pov-Pdemand,Pdemand is the active power control instruction at the current moment, P wind is the active power predicted by the wind power station, and P pv is the active power predicted by the photovoltaic power station;
when the energy storage station finishes charging, the adjusted active power set value of the energy storage station For the active power value of the currently given energy storage station.
17. The wind-solar energy storage station active power-frequency optimization control system according to claim 11, wherein if the active power control command at the current moment is greater than the predicted wind-solar station active power value, the specific steps of adjusting the charging and discharging states of the energy storage station and the active power control command of the wind-solar energy storage station are as follows:
Calculating remaining required power supply power P need＝Pdemand-Pwind-Ppv,Pdemand as an active power control instruction at the current moment, wherein P wind is active power predicted by a wind power station, P pv is active power predicted by a photovoltaic station, judging whether the energy storage station is in a charging state or a discharging state at the moment, if so, converting into the discharging state, if so, judging whether the current active power of the energy storage station is larger than the remaining required power supply power, if so, taking the remaining required power supply power P need as an adjusted active power set value of the energy storage station, and otherwise, taking the current active power value P bess of the energy storage station as an adjusted active power set value of the energy storage station.
18. The active power-frequency optimization control system of a wind-solar energy storage station according to claim 11, wherein before primary frequency modulation control is executed, primary frequency modulation curves and measurement points of a wind power station, a photovoltaic station and an energy storage station are acquired first, if the difference value between the frequency of the measurement point and a reference point is smaller than a first threshold value, normal operation is judged, if the difference value is not smaller than the first threshold value and smaller than a second threshold value, primary frequency modulation is executed, if the difference value is larger than the second threshold value, load is cut off by a cutting machine, and a main switch of the measurement point is disconnected;
The primary frequency modulation is carried out in two conditions of too low frequency and too high frequency, and the active power set value of the adjusted energy storage station is adjusted again when the primary frequency modulation is carried out.
19. The wind-solar energy storage station active power-frequency optimization control system according to claim 18, wherein when the frequency is too low, judging whether the wind power station deviates from a maximum power tracking point to operate, if yes, releasing the wind power station active power, judging whether the frequency meets the requirement, if yes, stopping frequency modulation, otherwise, judging whether the photovoltaic station deviates from the maximum power tracking point, if yes, releasing the photovoltaic station active power, judging whether the frequency meets the requirement, if yes, stopping frequency modulation, otherwise, starting releasing electric quantity by the energy storage station, after releasing, judging whether the frequency meets the requirement, if yes, stopping frequency modulation, otherwise, reducing load operation until the frequency meets the requirement.
20. The wind-solar energy storage station active power-frequency optimization control system according to claim 18, wherein when the frequency is too high, the charging power of the energy storage station is firstly adjusted up according to a primary frequency modulation curve, whether the frequency meets the requirement or not is judged, if yes, the frequency modulation is stopped, otherwise, the wind power station is started to participate in primary frequency modulation, the wind power station is controlled to run away from a maximum power tracking point, whether the frequency meets the requirement or not is judged, if yes, the frequency modulation is stopped, otherwise, the photovoltaic station is started to participate in primary frequency modulation, the photovoltaic station is controlled to run away from the maximum power tracking point, whether the frequency meets the requirement or not is judged, if yes, the frequency modulation is stopped, otherwise, the loading operation is stopped, and the frequency meets the requirement.
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