CN109120002A - Transformation system, energy-storage system, dispatching method and machine readable media - Google Patents
Transformation system, energy-storage system, dispatching method and machine readable media Download PDFInfo
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- CN109120002A CN109120002A CN201811256162.6A CN201811256162A CN109120002A CN 109120002 A CN109120002 A CN 109120002A CN 201811256162 A CN201811256162 A CN 201811256162A CN 109120002 A CN109120002 A CN 109120002A
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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
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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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- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The dispatching method and relevant device of the energy-storage system in a kind of power transmission system are provided, the dispatching method includes: the working frequency that the power grid is detected according to certain time interval；Calculate the change rate of the working frequency in the time interval；Determine the energy-storage system to the power supply dispatching strategy of the power grid based on the change rate of the working frequency., can be to avoid the deficiency of grid power can be monitored in time and with prejudging using the solution of the present invention, and energy-storage system release electricity is controlled to make up the transmission power deficiency of power grid.
Description
Technical field
The present invention relates to the management and running of power transmission, especially power transmission.
Background technique
With the development of energy utilization technology, presently, there are a plurality of types of generation technologies and corresponding power plant, these
The electric power that power plant generates may be incorporated into country or urban distribution network, usually in terms of power generation type, can be divided into alternative electric generation and direct current is sent out
It is bright.Fig. 1 shows conventional electrical power transmission system, wherein can using the power plant of the technologies such as firepower, wind-power electricity generation or tidal power generation
Output AC power source 101；And use the exportable DC power supply 102 of power plant of the technologies such as fuel cell technology or solar energy.In order to
The electric power that these different type generation technologies generate is connected to the grid in 104, exchange-is generallyd use in transformation system 103 directly
Convertor transformer 1031 will be converted into direct current using the alternating current of the generation technologies such as wind generating technology or tide output, using straight
Stream-commutator transformer 1032 will be converted into matched direct current using the direct current of the outputs such as heliotechnics, then in transformation
In system again through DC-AC transformer 1033 by this two kinds of direct currents be converted into the matched alternating current of power grid 104, thus
It is grid-connected into power grid 104.
Due to the diversity of generation technology, usually come at two problems: (1) power surplus leads to function of transmitting electricity in power grid 104
Rate is excessive；(2) it if some power plant or device fails, will lead to the transmission power decline of pre-designed power grid, or supply
Electricity demanding increase etc., these can all cause electricity shortage.To solve this problem, energy storage is usually provided in electrical power transmission system
System 200, the energy-storage system are connected to power grid 104 by transformer 1034 and 1033, for being sent out according to grid dispatching center 105
Automatic Generation Control (AGC) dispatch command 106 out adjusts the power supply in the power grid 104.In general, in dispatching of power netwoks
The heart 105 detects the output power on power grid 104 at regular intervals, and while confirming output power deficiency is sent out to energy-storage system 200
The AGC instruction 106 of electricity is discharged, out to make up the underpower in power grid 104.
However, since grid dispatching center 105 is generally only periodically to be monitored to the transmission power of power grid 104,
Therefore the hysteresis quality of AGC instruction 106 is typically resulted in, and then causes energy-storage system that cannot effectively be adjusted to grid power in time
Degree.
Summary of the invention
It is an object of the invention to solve the problems of the prior art, propose one kind can in time and can efficiently monitor with prejudging
Grid power and the scheme that it is scheduled.
According to an aspect of the present invention, a kind of energy-storage system for power transmission system is provided, the electricity is couple to
Power grid in power transportation system, comprising: detection module is configured to detect the work frequency of the power grid according to certain time interval
Rate；Control module is configured that the change rate for calculating the working frequency in the time interval；And it is based on the work
The change rate of working frequency determines the energy-storage system to the power supply dispatching strategy of the power grid.According to the solution of the present invention, pass through
Grid power and its variation tendency are locally monitored by energy-storage system, the scheduling to grid power can be realized in time, avoid
Lag, which adjusts brought scheduling, improperly to be influenced.
In a preferred embodiment, the detection module detection respectively corresponds at first time T1, the second time T2
Working frequency F1, F2；The control module calculates the change rate of the working frequency: δ=(F2- according to following formula
F1)/(T2-T1), and by the power supply dispatching strategy that the control module determines include: when δ be less than or equal to the first threshold
When value, the energy-storage system is dispatched to the power grid and discharges electricity；When δ is greater than the first threshold, using the energy storage system
Scheduled charged state (SoC) management rule controls the energy-storage system and charges from power grid absorption electricity in system.It fills
Electricity condition (SoC) management rule is a set of charge/discharge management rule used in the prior art, can be based on energy storage/charge shape
Power generation output power, energy storage power and the load of state coordination electric system.Using the solution of the present invention, by detecting mains frequency
The quick and Accurate Prediction to grid power variation tendency may be implemented in change rate, can in time be charged state (SoC) pipe
Reason rule provides reference signal, therefore the fast and accurately scheduling to power grid may be implemented.
In a preferred embodiment, the control module further judges whether δ is greater than second threshold, wherein described
Two threshold values are greater than the first threshold, and when δ is greater than the second threshold, the control module adjusts the scheduled charging shape
State management rule, such as preset charging current in charged state management rule is increased, to quickly absorb grid power.Benefit
With the program, adjustment charging strategy can be accelerated in power grid output power rapid increase, so as to quickly absorb electricity in time
Can, it avoids more wasting.
In a preferred embodiment, the detection module detection is in first time T1, the second time T2, third time T3
Locate corresponding described working frequency F1, F2, F3；The control module calculates the change of the working frequency according to following formula
Rate: δ=(F2-F1)/(T2-T1), and by the power supply dispatching strategy that the control module determines include: when δ is less than
Or equal to first threshold and when F3 is less than F2, the energy-storage system is dispatched to the power grid and discharges electricity；When δ is greater than described the
When one threshold value, the energy-storage system is controlled using charged state management rule scheduled in the energy-storage system and is inhaled from the power grid
Electricity is received to charge.Using the variation of monitoring grid power and actual grid power is combined, power grid can be more accurately judged
Real standard, to provide more accurate scheduling strategy.
In a preferred embodiment, wherein the control module further judges whether δ is greater than second threshold, wherein institute
Second threshold is stated greater than the first threshold, when δ is greater than the second threshold and F3 is greater than F2, the control module is adjusted
The scheduled charged state management rule.Using the program, it can accelerate adjustment at power grid output power rapid increase and fill
Electric strategy avoids more wasting so as to quickly absorb electric energy in time.
In a preferred embodiment, energy-storage system further comprises: receiving module, for receiving automatic generation from outside
Control (AGC) traffic order；Wherein the control module according to preset priority select determined by power supply dispatching strategy with
By one of the power supply dispatching strategy of the Automatic Generation Control (AGC) traffic order instruction, as the final of the energy-storage system
Power supply dispatching strategy.In one example, the time interval, which is less than from outside, receives Automatic Generation Control (AGC) tune
It drags out a miserable existence the time interval of order.The present invention, can be real according to actual needs by providing two scheduling strategy options for energy-storage system
Now to the multiple control of energy-storage system.
In a preferred embodiment, energy-storage system further comprises: storage source；Charge/discharge change-over switch, wherein when
The power supply dispatching strategy is when discharging electricity to the power grid, and the control module controls the charge/discharge change-over switch
Discharge mode is converted to, so that the storage source discharges electricity to the power grid to make up the electric power deficiency of the power grid；Work as institute
When stating power supply dispatching strategy to absorb electricity from the power grid using the charged state management rule control energy-storage system,
The control module controls the charge/discharge change-over switch and is converted to charge mode, so that the storage source is from the power grid
Electricity is absorbed to charge.
It is another aspect of this invention to provide that provide a kind of transformation system, be connected to an energy-storage system and a power grid (104) it
Between, comprising: detection module (1035) is configured to detect the working frequency of the power grid according to certain time interval；Control mould
Block (1036) is configured that the change rate for calculating the working frequency in the time interval；It is determined based on the change rate
Power supply dispatching strategy of the energy-storage system to the power grid；The power supply dispatching strategy is indicated to energy-storage system output
Load dispatching instruction.It according to the solution of the present invention, can be with by by transformation system real-time monitoring grid power and its variation tendency
Timely dispatch command is provided for energy-storage system, to realize the scheduling to grid power, is avoided brought by lag adjusting
Scheduling improperly influences.
In a preferred embodiment, the detection module detection respectively corresponds at first time T1, the second time T2
Working frequency F1, F2；The control module calculates the change rate of the working frequency: δ=(F2- according to following formula
F1)/(T2-T1)；It include: wherein when δ is less than or equal to the first threshold by the power supply dispatching strategy that the control module determines
When value, dispatches the energy-storage system and electricity is discharged to the power grid；When δ is greater than the first threshold, using the energy storage system
Scheduled charged state management rule controls the energy-storage system and charges from power grid absorption electricity in system.
In a preferred embodiment, wherein the control module further judges whether δ is greater than second threshold, wherein institute
Second threshold is stated greater than the first threshold, when δ is greater than the second threshold, the power supply dispatching strategy includes described in adjustment
Scheduled charged state management rule.
In a preferred embodiment, the detection module detection is in first time T1, the second time T2, third time T3
Locate corresponding described working frequency F1, F2, F3；The control module calculates the change of the working frequency according to following formula
Rate: δ=(F2-F1)/(T2-T1), and
It include: when δ is less than or equal to first threshold and F3 by the power supply dispatching strategy that the control module determines
When less than F2, the energy-storage system is dispatched to the power grid and discharges electricity；When δ is greater than the first threshold, using the storage
Scheduled charged state management rule controls the energy-storage system and charges from power grid absorption electricity in energy system.
In a preferred embodiment, the control module further judges whether δ is greater than second threshold, wherein described
Two threshold values are greater than the first threshold, when δ is greater than or equal to second threshold and F3 is greater than or equal to F2, the power supply dispatching
Strategy includes adjusting the scheduled charged state management rule.
According to another aspect of the present invention, a kind of dispatching method for the energy-storage system in power transmission system is provided,
The energy-storage system is couple to a power grid by a transformation system, comprising: detects the power grid according to certain time interval
Working frequency；Calculate the change rate of the working frequency in the time interval；Change rate based on the working frequency
Determine the energy-storage system to the power supply dispatching strategy of the power grid.According to the solution of the present invention, pass through real-time monitoring power grid function
Rate and its variation tendency can provide timely dispatch command for energy-storage system, to realize the scheduling to grid power, avoid
Lag adjust brought by scheduling improperly influence.
In a preferred embodiment, the working frequency of the detection power grid includes detection in first time T1, the
Corresponding working frequency F1, F2 at two time T2, wherein the change rate of the working frequency calculates according to the following formula: δ
=(F2-F1)/(T2-T1), wherein the determination energy-storage system includes: when δ is small to the power supply dispatching strategy of the power grid
When first threshold, dispatches the energy-storage system and electricity is discharged to the power grid；When δ is greater than the first threshold,
Using charged state management rule scheduled in the energy-storage system control the energy-storage system from the power grid absorb electricity into
Row charging.
In a preferred embodiment, the dispatching method further comprises: judge whether δ is greater than second threshold, wherein
The second threshold is greater than the first threshold, and when δ is greater than or equal to the second threshold, the power supply dispatching strategy includes
Adjust the scheduled charged state management rule.
In a preferred embodiment, the working frequency of the detection power grid includes detection in first time T1, the
Corresponding described working frequency F1, F2, F3 at two time T2, third time T3；The wherein change rate of the working frequency
It calculates according to the following formula: δ=(F2-F1)/(T2-T1), wherein power supply dispatching of the determination energy-storage system to the power grid
Strategy includes: to dispatch the energy-storage system when δ is less than or equal to first threshold and F3 is less than F2 and discharge electricity to the power grid
Amount is insufficient to make up the grid power；When δ is greater than the first threshold, using charging shape scheduled in the energy-storage system
State management rule controls the energy-storage system and charges from power grid absorption electricity.
In a preferred embodiment, the dispatching method further comprises: judge whether δ is greater than second threshold, wherein
The second threshold is greater than the first threshold, when δ is greater than or equal to the second threshold and F3 is greater than F2, the power supply
Scheduling strategy includes adjusting the scheduled charged state management rule.
In a preferred embodiment, the dispatching method is executed by the energy-storage system, the dispatching method into
One step includes: to receive Automatic Generation Control (AGC) traffic order from outside；Identified power supply is selected according to preset priority
Scheduling strategy and one of the power supply dispatching strategy by the instruction of the Automatic Generation Control (AGC) traffic order, as the energy storage
The final power supply dispatching strategy of system.In one example, the time interval, which is less than from outside, receives the AGC scheduling life
The time interval of order.
In a preferred embodiment, the dispatching method is executed by the transformation system, the dispatching method into
One step includes: to utilize identified power supply dispatching strategy generating auxiliary dispatching order；Auxiliary dispatching order generated is sent
To the energy-storage system.
Detailed description of the invention
Fig. 1 shows the schematic diagram of conventional electrical power transmission system；
Fig. 2 shows the schematic diagrames according to the energy-storage system of one embodiment；
Fig. 3 shows the voltage waveform of electric transfers on network；
Fig. 4 shows the schematic diagram of the transformation system according to one embodiment；
Fig. 5 shows the flow chart of the scheduling energy-storage system according to one embodiment；
Fig. 6 shows the flow chart of the scheduling energy-storage system according to another embodiment.
Wherein description of symbols:
101-102: power plant 103: transformation system 200: energy-storage system
1031: AC-DC transformer 1032: DC-DC transformer
1033: DC-AC transformer 1034: DC-DC transformer
104: power grid 105: grid dispatching center 106:AGC dispatch command
201:AGC receiving module 202: control module
203: charge/discharge switches switch 204: storage source 205: detection module
206: auxiliary dispatching command reception module 1035: detection module
1036: control module 1037: auxiliary dispatching instruction
S501: process starts S502: detection frequency S503: threshold value comparison
S504: time delay S505: frequency compares S506: working out strategy
S601: process starts S602: detection frequency S603: threshold value comparison
S604: time delay S605: frequency compares S606: working out strategy
S607: threshold value comparison S608: time delay S609: frequency compares
S510: it works out strategy S511: generating auxiliary dispatching instruction
Specific embodiment
Method and apparatus provided in an embodiment of the present invention is described in detail with reference to the accompanying drawing.Although being shown in attached drawing
The preferred embodiment of the disclosure, however, it is to be appreciated that may be realized in various forms the disclosure without that should be illustrated here
Embodiment limited.On the contrary, these embodiments are provided so that this disclosure will be more thorough and complete, and can incite somebody to action
The scope of the present disclosure is fully disclosed to those skilled in the art.
Fig. 2 shows the schematic diagrames for the energy-storage system 200 that can be applied to electrical power transmission system shown in FIG. 1.As shown,
Energy-storage system 200 includes AGC receiving module 201, control module 202, charge/discharge switching switch 203 and storage source 204.
Wherein AGC receiving module 201 is used to receive AGC traffic order 106 from control centre 105, and is supplied to control module 202.Control
Molding block 202 parses the AGC traffic order 106 received, to determine the power supply dispatching plan of the sending of control centre 105
Slightly.For example, control module 202 then indicates when the power supply dispatching strategy indicates that energy-storage system 200 discharges electricity to power grid 104
Charge/discharge switching switch 203 switches to discharge mode, so that storage source 204 is exported by transformation system 103 to power grid 104
Electric power.And when the power supply dispatching strategy parsed from AGC traffic order 106 does not include to discharge the instruction of electricity, alternatively, working as
It when AGC receiving module 201 does not receive AGC order 106 from control centre 105, is then default to, control module 202 can refer to
Show that charge/discharge switching switch 203 switches to charge mode, to be charged from power grid 104 to storage source 204；Or control
Molding block 202 can also indicate that charge/discharge switching switch 203 is hung up, and storage source 204 is isolated with power grid 104.However,
When control centre 105 finds that transmission power declines and issues AGC instruction, possible this electricity shortage phenomenon has existed one section
Time, and advised when energy-storage system receives the AGC and instruct and start to execute internal pre-stored SOC (charged state) management
When then for example preparing to discharge electricity to power grid 104, it may occur however that the repaired failure of the power plant of failure, grid power transmission power is
Restore a period of time.Energy-storage system 200 will cause waste to power grid release electricity again at this time as a result,.Another situation is that such as
Fruit grid power transmission power is insufficient, fills when energy-storage system 200 does not receive the AGC order being adjusted and carrying out energy storage
When electric, then the transmission power on power grid can be further consumed, therefore will appear and deteriorate grid power trend.
Therefore, energy-storage system 200 according to the present invention still further comprises a detection module 205, for supervising in real time
The power of power grid 104 is surveyed, and the grid power level that will test is supplied to control module 202.Due to the electricity of electric transfers on network
The variation of the working frequency of stream directly reflects the equilibrium condition of output power, in the case where output power stable equilibrium, electricity
The working frequency of net may be typically maintained in rated value such as 50Hz.And when power plant exports and is greater than in the power of electric transfers on network
When the power of user's consumption, the working frequency of the electric current transmitted on power grid 104 will be increased.On the contrary, when user's consumption power is big
When transimission power on power grid, working frequency will be reduced.Therefore, according to one embodiment, detection module 205 can supervise in real time
The working frequency of power grid 104 is surveyed, and the working frequency sampled value F that measurement obtains is supplied to control according to the preset time interval
Module 202.Here, according to actual needs, preset time interval is set as the receiving time interval less than AGC dispatch command.
For example, as shown in figure 3, due to the transmission voltage on power grid be usually in the form of sine wave transmit, detection module
205 can real-time monitoring every half period when working frequency F, such as when detectable sine wave zero crossing, that is, work of voltage when being zero
Working frequency, thus working frequency F1, F2, F3 ... when obtaining moment T1, T2, T3 ....
When the device fails of some power plant, due to inertia of generating set etc., when measuring different at this time
Between the working frequency F difference put may can't be very big, however in order to accurately prejudge electrical grid transmission power necessarily under
This trend drops, it is proposed, according to the invention, control module 202 is receiving working frequency sampling F1, F2, F3 ... later, calculates power grid
Working frequency change rate δ, i.e., temporally differentiate δ=dF/dT to working frequency, frequency change rate δ can reflect power grid
The decrease speed of transimission power, in formula, dF indicates that the working frequency of front and back double measurement is poor, and dT indicate this double measurement when
Between be spaced.Such as control module 202 can be calculate by the following formula frequency change rate δ:
δ=(F2-F1)/(T2-T1)
It can be appreciated that indicating that network operation frequency is declining, and frequency change rate δ when frequency change rate δ is less than zero
Smaller (its absolute value is bigger in other words) indicates that the speed of working frequency decline is faster, and electric power factory equipment failure may occur for explanation
Or there is peak in electricity consumption, therefore power grid will emergent power deficiency.On the contrary, being indicated in power grid when frequency change rate δ is greater than zero
The working frequency of electric power rising, and frequency change rate δ is bigger, and the speed for indicating that working frequency rises is faster, then can table
Show power on power grid it is sufficient or excessively sufficient.Therefore, control module 202 can determine energy-storage system according to working frequency change rate δ
200 scheduling strategy.In one example, when δ is less than or equal to first threshold TH1, the control of control module 202 is charged/is put
Cutting changes switch 203 and is switched to discharge mode, to dispatch the release electricity of the storage source 204 in the energy-storage system, to make up
Electricity shortage on power grid 104, TH 1 may be set to less than zero here.And when control module 202 judges that δ is greater than first threshold
When TH1, molding block 202 controls charge/discharge switching switch 203 and is switched to charge mode, and makes a reservation for using in energy-storage system 200
Charged state management rule SoC control the charging strategy of energy-storage system 200, including absorb electricity from power grid 104 and filled
Electricity or pause charging etc..In general, charged state management rule SoC defines the charge mode to charge for storage source 204.
In another embodiment of the invention, control module 202 can also further judge whether δ is greater than second threshold
TH2, second threshold TH2 is greater than first threshold TH1 here, and may be set to be greater than zero.It is described when δ is greater than second threshold TH2
Control module 202 can adjust scheduled charged state (SoC) management rule.Due to when generation δ is greater than second threshold TH2's
When situation, show that biggish promotion occurs in grid power, therefore charged state management rule SoC, example can be appropriately modified
Charge mode is such as modified to charge using bigger charging current to storage source 204, described in absorbing more quickly
Electricity on power grid is to avoid causing to waste.Charged state (SoC) management rule how is specifically adjusted, those skilled in the art can basis
Depending on actual conditions, details are not described herein.
In another embodiment, it is contemplated that there are the possibility of normal fluctuation for power grid, and therefore, control module 202 is established
One threshold window, the lower boundary of the window is first threshold TH1, and coboundary is second threshold TH2, wherein TH1 < TH2.When
When the frequency change rate δ of calculating falls into the threshold window, charge/discharge can be switched switch 203 and be placed in one by control module 202
Default state, such as charge/discharge switching switch 203 is placed in suspended state, energy-storage system 200 and power grid 104 is isolated,
To avoid energy-storage system 200 to the excessive interference of power grid 104.
In another embodiment of the invention, control module 202 is when determining power supply dispatching strategy based on frequency change rate δ
It can also further consider the variation of actual grid power.Specifically, control module 202 is received from detection module 205
After corresponding working frequency F1, F2 at first time T1, the second time T2, first, in accordance with formula δ=(F2-F1)/
(T2-T1) the change rate δ of frequency is calculated.Then according to the change rate δ of frequency calculated and the work after the certain time-delay time
Working frequency such as F3 integrates the scheduling strategy of determining energy-storage system 200, the survey of delay time and working frequency F1, F2 here
Measuring time interval can be identical or different.In one example, the power supply dispatching strategy determined by control module 202 includes: to work as δ
Less than first threshold TH1 and F3 is less than F2, such as when the absolute value of the difference of F3 and F2 is greater than third threshold value TH3, described in scheduling
Energy-storage system 200 discharges electricity to the power grid 104；And when δ is greater than the first threshold, then as previously mentioned, institute can be used
The scheduled SoC management rule control energy-storage system 200 in energy-storage system is stated to be filled from the power grid 104 absorption electricity
Electricity.
In another embodiment of the invention, control module 202 further judges whether δ is greater than second threshold TH2, works as δ
It is described greater than second threshold TH2 and when F3 is greater than F2 (such as the absolute value of the difference of F3 and F2 is greater than the third threshold value TH3)
Control module adjusts the scheduled charged state management rule SoC, such as change to the charge mode of storage source 204.At this
In example, the value of first threshold TH1 and second threshold TH2 can be identical or different.For example, being truly reflected electricity due to considering
First threshold TH1 and second threshold TH2 can be selected as zero by the working frequency F3 of net power level.
As shown in Fig. 2, the control module 202 of energy-storage system 200 both can be to the received AGC order of AGC receiving module 201
It is parsed to receive the power supply dispatching strategy issued by grid dispatching center 105, also can use and mentioned by detection module 205
The mains frequency of confession samples and voluntarily works out power supply dispatching strategy.One embodiment according to the invention, in energy-storage system 200
Control module 202 can comprehensively consider this two kinds of power supply dispatching strategies.For example, control module 202 can be adjusted for this two kinds power supplies
When spending strategy setting priority, such as receiving this two kinds of scheduling strategies at the same time, the sending of grid dispatching center 105 can be set
The priority of power supply dispatching strategy is higher than the power supply dispatching strategy that control module 202 is voluntarily worked out, or opposite.Alternatively, connecing in the ban
When receiving the power supply dispatching strategy of the sending of grid dispatching center 105, control module 202 can indicate 205 real-time detection of detection module
The working frequency of power grid simultaneously works out power supply dispatching strategy accordingly.When the power supply dispatching strategy and received power supply dispatching plan worked out
When slightly consistent, then corresponding scheduling is executed according to AGC order, and when there is inconsistency, then ignore the received AGC order.
It is to be herein pointed out in the examples described above, time point T1, T2, T3 of working frequency detected are respectively
At the time of continuous sine wave passes through zero point, it can be appreciated that the present invention is not limited thereto, detection module 205 can be by arbitrary
Time interval detects the working frequency of power grid, and the interval of T1 and T2 and the time interval of T2 and T3 can not also phases
Deng.Preferably, the time interval of T2 and T3 is greater than the interval of T1 and T2, fully to confirm the actual power variation of power grid.?
In one preferred embodiment, the network operation frequency based on monitoring of control module 202 works out the period of scheduling strategy, i.e. (T2-
T1)+(T3-T2) should be less than the time interval that energy-storage system 200 receives AGC traffic order from grid dispatching center 105, thus real
Now more timely than grid dispatching center, efficient power grid quality monitoring.
It in the above-described embodiments, is locally to monitor the working frequency of power grid by energy-storage system 200 oneself and work out corresponding
Power supply dispatching strategy.And in another embodiment of the invention, it can also be that energy-storage system 200 works out phase by transformation system 103
The power supply dispatching strategy answered.Fig. 4 shows the schematic diagram of transformation system 103 according to an embodiment of the invention.As shown,
The transformation system 103 includes detection module 1035 and control module 1036.It is noted herein that for simplicity, transformation
Other subsystems that system 103 is included are not shown with component.
As shown in figure 4, detection module 1035 monitors the working frequency of power grid 104, and will survey according to the preset time interval
The working frequency sampled value F measured is supplied to control module 1036.Similarly with energy-storage system working method shown in Fig. 3,
As an example, detection module 1035 can working frequency F on real-time monitoring power grid 104 when alternating voltage every half period,
Such as working frequency when detectable sine wave alternating current zero crossing, thus working frequency when obtaining moment T1, T2, T3 ...
F1,F2,F3…..According to the embodiment, control module 1036 is receiving working frequency F1, F2, F3 ... later, by work
Working frequency temporally differentiates to calculate the working frequency change rate δ of power grid, and frequency change rate δ can reflect electrical grid transmission function
The variation tendency of rate.Specifically, control module 1036 can be calculate by the following formula frequency change rate δ: δ=(F2-F1)/(T2-T1).
Control module 1036 can determine the scheduling strategy of energy-storage system 200 according to working frequency change rate δ as a result,.For example, working as δ
When less than or equal to first threshold TH1, control module 1036 can determine the underpower on power grid, therefore control module 1036 is made
The scheduling strategy ordered includes that the storage source 204 for needing to dispatch in the energy-storage system 200 discharges electricity to make up the confession on power grid
It is electric insufficient.When the control module 1036 judges that δ is greater than first threshold TH1, the scheduling strategy packet of the formulation of control module 1036
It includes suggestion energy-storage system 200 and uses charging strategy of the scheduled charged state SoC management rule from the power grid.
In another embodiment, control module 1036 further judges whether δ is greater than second threshold TH2, when δ is greater than second
When threshold value, control module 1036 can determine that transmission power is sufficient or excessively sufficient on power grid, therefore the scheduling strategy worked out includes suggesting
Energy-storage system 200 adjusts the scheduled charged state SoC management rule, such as adjusts the charge mode of energy-storage system to increase
Charging current etc..
After control module 1036 has worked out scheduling strategy, generating an auxiliary dispatching instruction should as shown in 1037 in figure
Dispatch command 1037 contains the scheduling strategy that control module 1036 is worked out, and auxiliary dispatching instruction 1037 is sent to storage
It can system 200.The embodiment according to the invention, energy-storage system 200 may include an auxiliary dispatching command reception module
206, the control module 202 in energy-storage system 200 is received by auxiliary dispatching command reception module 206 comes from transformation system 103
The dispatch command 1037 of generation.Control module 202 parses the scheduling strategy worked out by transformation system from dispatch command 1037, and
According to the switch mode of scheduling strategy control charge/discharge switching switch 203, realize to power grid release electricity or from institute
State the scheduling requirement that power grid absorbs electricity.
In one alternate embodiment, auxiliary dispatching command reception module can not be separately provided in energy-storage system 200
206, but dispatch command 1037 is directly received by AGC receiving module 201.The scheduling scheme realized according to the present invention as a result,
It does not need to carry out energy-storage system in the prior art modification in any structure.
Equally, in order to reduce influence of the power grid normal fluctuation to scheduling strategy, control module 1036 establishes a threshold window
Mouthful, the lower boundary of the window is first threshold TH1, and coboundary is second threshold TH2, and TH1 is less than zero here, and TH2 can be big
In zero.When the frequency change rate δ of calculating falls into the threshold window, output scheduling is instructed 1037 by control module 1036, by
This, energy-storage system 200 can be operated by default settings.
In another embodiment of the invention, control module 1036 is determining power supply dispatching strategy based on frequency change rate δ
When can also further consider the variation of actual mains frequency.Specifically, control module 1036 connects from detection module 1035
It receives after corresponding working frequency F1, F2 at first time T1, the second time T2, first, in accordance with formula δ=(F2-
F1 the change rate δ for)/(T2-T1) calculating frequency, then according to the change rate δ of frequency calculated and after the certain time-delay time
Working frequency such as F3 integrate the scheduling strategy of determining energy-storage system 200.In one example, when δ is less than or equal to the
When one threshold value TH1 and F3 are less than F2 (for example, the absolute value of the difference of F3 and F2 is greater than third threshold value TH3), by control module
The 1036 power supply dispatching strategies determined include: to generate to dispatch the energy-storage system to the dispatch command of power grid release electricity
1037；And when δ is greater than the first threshold, the power supply dispatching strategy determined by control module 1036 includes: energy-storage system 202
Energy-storage system is controlled using scheduled charged state SoC management rule to charge from power grid absorption electricity, and is generated and referred to
Show the instruction of the scheduling strategy.It can be appreciated that control module 1036 can not also export when δ is greater than the first threshold TH1
Any auxiliary dispatching instruction 1037, and energy-storage system can be operated in the case where not receiving auxiliary dispatching instruction by default mode,
Including being charged using scheduled charged state SoC management rule to energy-storage system.
In another embodiment, control module 1036 further judges whether δ is greater than second threshold TH2, when δ is greater than second
Threshold value TH2 and F3 be greater than F2 for example more than threshold value TH3 when, control module 1036, which produces, suggests that energy-storage system 200 adjusts institute
State the auxiliary dispatching instruction 1037 of scheduled charged state management rule.Here first threshold TH1 and second threshold TH2 can be with
Identical, Li such as Zhuo is set as zero.
Fig. 5 shows the method flow diagram of scheduling energy-storage system 200 in accordance with a preferred embodiment of the present invention.In this example
In, this method executes at energy-storage system 200.As shown, energy-storage system 200 starts the prison to power grid 104 in step S501
It surveys.
It is adopted in step S502 every each half period of sine wave alternating current in certain time interval such as power grid
Collect the frequency F of alternating current, such as F1, F2.Then in step S503, frequency F1, F2 of the alternating current based on acquisition calculates exchange
The change rate δ of the calculating and first threshold TH 1 is simultaneously compared by the change rate δ of the working frequency of electricity.
When step S503 determines that δ is less than or equal to first threshold TH 1, for TH1 less than zero, process proceeds to step here
Rapid 504, energy-storage system 200 further acquires the working frequency after a fixed response time, such as the working frequency F3 at acquisition T3 moment.
Then whether it is greater than third threshold in the absolute value for the difference for further determining that working frequency F3 and working frequency F2 in step S505
Value TH3.If it is greater than or be equal to third threshold value TH3, then show output power on current electric grid 104 there is obvious deficiency,
Therefore the scheduling strategy for forbidding energy-storage system 200 to charge using power grid is generated in step S506, and can further be indicated
Storage source 204 in energy-storage system 200 discharges electricity to power grid 104.If determining working frequency F3 and work in step S505
The absolute value of the difference of working frequency F2 is less than third threshold value TH3, then process return step S502, continues the working frequency to power grid
Monitoring and acquisition, and energy-storage system 200 is operated according to default mode.
When step S503 determines that frequency change rate δ is greater than first threshold TH1, process return step S502 continues pair
The monitoring and acquisition of the working frequency of power grid, and energy-storage system 200 is operated according to default mode.
The method flow of above-mentioned example is locally executed by energy-storage system 200, in another embodiment of the invention, should
Method flow can also be executed by transformation system 103, i.e., execute step S501~S506 shown in fig. 5 by transformation system 103.Only
Unlike one, when transformation system 103 is after step S506 has determined scheduling strategy, the generation of transformation system 103 contains institute
The instruction is simultaneously supplied to energy-storage system 200 by the dispatch command 1037 of determining scheduling strategy.As a result, from transformation system 103
After receiving dispatch command 1037, energy-storage system 200 executes corresponding according to the scheduling strategy parsed from dispatch command 1037
Operation.
Fig. 6 shows the method flow diagram of scheduling energy-storage system 200 in accordance with a preferred embodiment of the present invention.In this example
In, this method executes at energy-storage system 200.As shown, energy-storage system 200 starts the prison to power grid 104 in step S601
It surveys.
It is adopted in step S602 every each half period of sine wave alternating current in certain time interval such as power grid
Collect the frequency F of alternating current, such as F1, F2.Then in step S603, frequency F1, F2 of the alternating current based on acquisition calculates exchange
The change rate δ of the calculating and first threshold TH 1 is simultaneously compared by the change rate δ of the working frequency of electricity.
When step S603 determines that δ is less than or equal to first threshold TH 1, process proceeds to step 604, energy-storage system
200 further acquire the working frequency after a fixed response time, such as the working frequency F3 at acquisition T3 moment.Then in step
S605 further determines that whether the absolute value of the difference of working frequency F3 and working frequency F2 is greater than third threshold value TH3.If big
In or be equal to third threshold value TH3, then there is clear deficiencies for the output power for showing on current electric grid 104, therefore in step
S606 generates the scheduling strategy for forbidding energy-storage system 200 to charge using power grid, and can further indicate energy-storage system 200
In storage source 204 to power grid 104 discharge electricity.If in the difference for determining working frequency F3 Yu working frequency F2 in step S605
The absolute value of value is less than third threshold value TH3, then process return step S602, continues the monitoring to the working frequency of power grid and adopt
Collection.
When step S603 determines that frequency change rate δ is greater than first threshold TH1, process proceeds to step S607, into one
Whether step determination frequency change rate δ is greater than second threshold TH2.If it is determined that frequency change rate δ be less than second threshold TH2, then into
Journey return step S602 continues monitoring and acquisition to the working frequency of power grid, and energy-storage system is operated according to default mode.
If determination frequency change rate δ is greater than or equal to second threshold TH2 at step S607, process proceeds to step
S608 further acquires the working frequency after a fixed response time, such as the working frequency F3 at acquisition T3 moment.Then in step
S609 further determines that whether the absolute value of the difference of working frequency F3 and working frequency F2 is greater than third threshold value TH3.If big
In or equal to third threshold value TH3, then show that the output power on current electric grid 104 is excessively sufficient, therefore generates and indicate in step S510
Energy-storage system 200 adjusts scheduled charged state management rule SoC, such as changes charge mode.If determined in step S609
The absolute value of the difference of working frequency F3 and working frequency F2 is less than third threshold value TH3, then shows the power supply on current electric grid 104
Power may be intended to balance, therefore process return step S602, continue the monitoring and acquisition to the working frequency of power grid, and
Energy-storage system 200 is operated according to default mode.
The method flow of above-mentioned example is locally executed by energy-storage system 200, in another embodiment of the invention, should
Method flow can also be executed by transformation system 103, i.e., execute step S601~S610 shown in fig. 5 by transformation system 103.Only
Unlike one, when transformation system 103 is after step S606 and step S510 have determined scheduling strategy, process proceeds to step
S611.In step S611, transformation system 103 generate contain determined by scheduling strategy dispatch command 1037 and by the instruction
It is supplied to energy-storage system 200.As a result, after receiving dispatch command 1037 from transformation system 103, energy-storage system 200 according to from
The scheduling strategy parsed in dispatch command 1037 executes corresponding operation.
Method of the invention can be executed by central processing unit CPU or processor the program being stored in memory or
Instruction is to realize.Another embodiment of the present invention provides machine readable media on be stored with machine readable instructions, this is machine readable
Instruction makes processor execute any method above-mentioned, therefore machine readable code and storage machine when being executed by processor
The machine readable media of readable code constitutes a part of the invention.The embodiment of machine readable media include floppy disk, hard disk,
It is magneto-optic disk, CD (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), tape, non-volatile
Storage card and ROM.Selectively, can by communication network download program code from server computer or on cloud.
It should be noted that step not all in above-mentioned each method process be all it is necessary, can be according to actual
Need to ignore certain steps or module.In addition, the present invention be not yet each step execution sequence be not it is fixed, can basis
It needs to be adjusted.System structure described in the various embodiments described above can be physical structure, be also possible to logical construction, that is,
Some modules may be realized by same physical entity, be realized alternatively, some modules may divide by multiple physical entities, alternatively, can
To be realized jointly by certain components in multiple autonomous devices.
Detailed displaying and explanation carried out to the present invention above by attached drawing and preferred embodiment, however the present invention is not limited to
These embodiments having revealed that, base could be aware that with above-mentioned multiple embodiment those skilled in the art, can combine above-mentioned difference
Code audit means in embodiment obtain the more embodiments of the present invention, these embodiments also protection scope of the present invention it
It is interior.
Claims (23)
1. a kind of energy-storage system (200) for power transmission system, the power grid being couple in the power transmission system
(104), comprising:
Detection module (205) is configured to detect the working frequency of the power grid (104) according to certain time interval；
Control module (202), is configured that
Calculate the change rate of the working frequency in the time interval；And
Determine the energy-storage system (200) to the power supply dispatching plan of the power grid (104) based on the change rate of the working frequency
Slightly.
2. energy-storage system (200) as claimed in claim 1, wherein
The detection module (205) detection at first time T1, the second time T2 the corresponding working frequency F1,
F2；
The control module (202) calculates the change rate of the working frequency according to following formula:
δ=(F2-F1)/(T2-T1), and
Include: by the power supply dispatching strategy that the control module (202) determine
When δ is less than or equal to first threshold, the energy-storage system (200) is dispatched to the power grid (104) and discharges electricity；
When δ is greater than the first threshold, institute is controlled using charged state management rule scheduled in the energy-storage system (200)
Energy-storage system (200) is stated to charge from the power grid (104) absorption electricity.
3. energy-storage system (200) as claimed in claim 2, wherein the control module (202) further judges whether δ is greater than second
Threshold value, wherein the second threshold is greater than the first threshold,
When δ is greater than the second threshold, the control module (202) adjusts the scheduled charged state management rule.
4. energy-storage system (200) as claimed in claim 1, wherein
Detection module (205) detection corresponding work at first time T1, the second time T2, third time T3
Working frequency F1, F2, F3；
The control module (202) calculates the change rate of the working frequency according to following formula:
δ=(F2-F1)/(T2-T1), and
Include: by the power supply dispatching strategy that the control module (202) determine
When δ is less than or equal to first threshold and F3 is less than F2, the energy-storage system (200) is dispatched to the power grid (104)
Discharge electricity；
When δ is greater than the first threshold, institute is controlled using charged state management rule scheduled in the energy-storage system (200)
Energy-storage system (200) is stated to charge from the power grid (104) absorption electricity.
5. energy-storage system (200) as claimed in claim 4, wherein the control module (202) further judges whether δ is greater than second
Threshold value, wherein the second threshold is greater than the first threshold,
When δ is greater than the second threshold and F3 is greater than F2, the control module (202) adjusts the scheduled charged state
Management rule.
6. further comprising such as the energy-storage system (200) of one of claim 1-5:
Receiving module (201), for receiving Automatic Generation Control (AGC) traffic order from outside；
Wherein the control module (202) is according to power supply dispatching strategy determined by the selection of preset priority and by described automatic
One of the power supply dispatching strategy of Generation Control (AGC) traffic order instruction, the final power supply as the energy-storage system (200)
Scheduling strategy.
7. energy-storage system (200) as claimed in claim 6, wherein the time interval, which is less than from outside, receives the automatic generation control
Make the time interval of (AGC) traffic order.
8. further comprising such as the energy-storage system (200) of one of claim 1-7:
Storage source (204)；
Charge/discharge change-over switch (203), wherein
When the power supply dispatching strategy is to discharge electricity to the power grid (104), filled described in control module (202) control
Electricity/electric discharge change-over switch is converted to discharge mode, so as to the power grid (104) to discharge electricity described to make up for the storage source
The electric power of power grid (104) is insufficient；
When the power supply dispatching strategy is to control the energy-storage system (200) from the electricity using the charged state management rule
When net (104) absorbs electricity, the control module (202) controls the charge/discharge change-over switch and is converted to charge mode, with
Toilet states storage source and charges from the power grid (104) absorption electricity.
9. a kind of transformation system (103), is connected between an energy-storage system (200) and a power grid (104), comprising:
Detection module (1035) is configured to detect the working frequency of the power grid (104) according to certain time interval；
Control module (1036), is configured that
Calculate the change rate of the working frequency in the time interval；
Determine the energy-storage system (200) to the power supply dispatching strategy of the power grid (104) based on the change rate；
The load dispatching instruction of the power supply dispatching strategy is indicated to the energy-storage system (200) output.
10. transformation system (103) as claimed in claim 9, wherein
The detection module (1035) detection at first time T1, the second time T2 the corresponding working frequency F1,
F2；
The control module (1036) calculates the change rate of the working frequency according to following formula:
δ=(F2-F1)/(T2-T1)；
Wherein include: by the power supply dispatching strategy that the control module (1036) determine
When δ is less than or equal to first threshold, dispatches the energy-storage system (200) and electricity is discharged to the power grid (104)；
When δ is greater than the first threshold, institute is controlled using charged state management rule scheduled in the energy-storage system (200)
Energy-storage system (200) is stated to charge from the power grid (104) absorption electricity.
11. such as the transformation system (103) of claim 10, wherein the control module (1036) further judges whether δ is greater than
Second threshold, wherein the second threshold is greater than the first threshold,
When δ is greater than the second threshold, the power supply dispatching strategy includes adjusting the scheduled charged state management rule.
12. transformation system (103) as claimed in claim 9, wherein
Detection module (1035) detection is corresponding described at first time T1, the second time T2, third time T3
Working frequency F1, F2, F3；
The control module (1036) calculates the change rate of the working frequency according to following formula:
δ=(F2-F1)/(T2-T1), and
Include: by the power supply dispatching strategy that the control module (1036) determine
When δ is less than or equal to first threshold and F3 is less than F2, the energy-storage system (200) is dispatched to the power grid (104)
Discharge electricity；
When δ is greater than the first threshold, institute is controlled using charged state management rule scheduled in the energy-storage system (200)
Energy-storage system (200) is stated to charge from the power grid (104) absorption electricity.
13. such as the transformation system (103) of claim 12, wherein the control module (1036) further judges whether δ is greater than
Second threshold, wherein the second threshold is greater than the first threshold,
When δ is greater than or equal to second threshold and F3 is greater than or equal to F2, the power supply dispatching strategy includes that adjustment is described pre-
Fixed charged state management rule.
14. a kind of dispatching method for the energy-storage system in power transmission system, the energy-storage system passes through a transformation system
It is couple to a power grid, comprising:
The working frequency of the power grid is detected according to certain time interval；
Calculate the change rate of the working frequency in the time interval；
Determine the energy-storage system to the power supply dispatching strategy of the power grid based on the change rate of the working frequency.
15. such as the dispatching method of claim 14, wherein
The working frequency of the detection power grid includes that detection is corresponding described at first time T1, the second time T2
Working frequency F1, F2, wherein the change rate of the working frequency calculates according to the following formula:
δ=(F2-F1)/(T2-T1),
Wherein the determination energy-storage system includes: to the power supply dispatching strategy of the power grid
When δ is less than or equal to first threshold, dispatches the energy-storage system and electricity is discharged to the power grid；
When δ is greater than the first threshold, the storage is controlled using charged state management rule scheduled in the energy-storage system
Energy system absorbs electricity from the power grid and charges.
16. further comprising such as the dispatching method of claim 15:
Judge whether δ is greater than second threshold, wherein the second threshold is greater than the first threshold,
When δ is greater than or equal to the second threshold, the power supply dispatching strategy includes adjusting the scheduled charged state pipe
Reason rule.
17. such as the dispatching method of claim 14, wherein
The working frequency of the detection power grid includes detection in first time T1, the second time T2, third time T3 punishment
Not corresponding described working frequency F1, F2, F3；Wherein the change rate of the working frequency calculates according to the following formula:
δ=(F2-F1)/(T2-T1),
Wherein the determination energy-storage system includes: to the power supply dispatching strategy of the power grid
When δ, which is less than or equal to first threshold and F3, is less than F2, dispatch the energy-storage system to the power grid discharge electricity with
It is insufficient to make up the grid power；
When δ is greater than the first threshold, the storage is controlled using charged state management rule scheduled in the energy-storage system
Energy system absorbs electricity from the power grid and charges.
18. further comprising: judging whether δ is greater than second threshold, wherein second threshold such as the dispatching method of claim 17
Value is greater than the first threshold,
When δ is greater than or equal to the second threshold and F3 is greater than F2, the power supply dispatching strategy includes adjusting described make a reservation for
Charged state management rule.
19. such as the dispatching method of one of claim 14-18, wherein the dispatching method is executed by the energy-storage system,
The dispatching method further comprises:
Automatic Generation Control (AGC) traffic order is received from outside；
Identified power supply dispatching strategy is selected according to preset priority and by the Automatic Generation Control (AGC) traffic order
One of power supply dispatching strategy of instruction, the final power supply dispatching strategy as the energy-storage system.
20. such as the dispatching method of claim 19, wherein the time interval is less than from the external reception AGC traffic order
Time interval.
21. such as the dispatching method of one of claim 14-18, wherein the dispatching method is executed by the transformation system,
The dispatching method further comprises:
Utilize identified power supply dispatching strategy generating auxiliary dispatching order；
Auxiliary dispatching order generated is sent to the energy-storage system.
22. a kind of power supply dispatching equipment, comprising:
Memory is stored thereon with executable instruction；
Processor is configured to execute method of the described instruction to realize one of claim 14-21.
23. a kind of machine readable media is stored thereon with executable instruction, when described instruction is executed by the machine, make
The machine realizes the described in any item methods of claim 14-21.
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