CN113113940A - Active power control distribution algorithm for improving power generation amount during wind power plant power limit - Google Patents
Active power control distribution algorithm for improving power generation amount during wind power plant power limit 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses an active power control distribution algorithm for improving the power generation capacity of a wind power plant during power limitation, which is characterized in that the distance between the active power control distribution algorithm and a line of a booster station of the wind power plant is used as an important control priority factor, a unit which is far away from the line of the booster station of the wind power plant is preferentially controlled during the power-limiting power generation operation, and a unit which is near to the line of the booster station of the wind power plant is controlled only when the dispatching instruction requirement is not met, specifically, when a plurality of units run for power generation, the active power control priority of the unit which is near to the line of the booster station of the wind power plant is lower, and the active power output of the unit of the type is limited only when the power-limiting instruction is not met and the; therefore, the active power line loss is reduced, the active power output of the wind power plant is improved, and finally the generated energy of the wind power plant is improved.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to an active power control distribution algorithm for improving the generated energy during the power limit of a wind power plant.
Background
With the rapid development of new energy wind power generation, the loading amount of a single wind power plant is larger and larger, most wind power plants have the condition of electricity limitation in windy weather every year, the more the loading amount is, the more the current collecting lines of the wind power plants are, the longer the length of the single current collecting line is, the less the active power generated by a unit closer to the line of the booster station of the wind power plant passes through the line distance, and the more the active power can be transmitted to a power grid. Therefore, under the condition of large wind power limit, the active power output of the unit far away from the line of the booster station of the wind power plant can be preferentially controlled aiming at the unit with active power output, and the unit near the line of the booster station of the wind power plant can preferentially generate power.
Currently, active power control of most wind power plants is provided by a unit manufacturer, and the system is called a wind power plant energy management platform (hereinafter referred to as an energy management platform), and a power grid dispatching system of the wind power plants is generally provided by a third party and is called a power grid dispatching system. The systems are mutually independent, so that the positions of active power acquisition points acquired by the two systems are not uniform, and the output P of the wind turbine generator is acquired and controlled by a manufacturer of the wind turbine generatorfmThe third party manufacturer acquires and controls the active power P of the access power grid pointsm. The calculation formula is as follows:
Psl＝Pfm-Psm。
Psli.e. the active power lost by the line, due to the law of conservation of physical energy in nature, PslWill always be a positive number; this results in that the active power output controlled by the unit manufacturer meets the target value of the dispatching system when the wind farm is operated according to the dispatching system for generating power, due to the existence of PslI.e. line loss, P transmitted to the gridsmThe power generation capacity is small, so that the power generation capacity of the wind power plant is less; most of the existing power distribution algorithm technology is adjusted according to the power generation capacity of each unit, only the requirement of meeting the active power instruction of a power grid is considered, and the loss caused by the loss of a line is not considered, so that the generated energy is lost by the existing control distribution algorithm.
Disclosure of Invention
The invention aims to provide an active power control distribution algorithm for improving the generated energy during the power limit of a wind power plant so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the active power control distribution algorithm for improving the power generation amount during the limited power of the wind power plant comprises a wind generating set, an Ethernet switch, an energy management platform and a power grid dispatching system, wherein the wind generating set is electrically connected with the Ethernet switch through an optical fiber, the Ethernet switch is electrically connected with the energy management platform in a two-way mode through the Ethernet, and the energy management platform is electrically connected with the power grid dispatching system in the two-way mode through the Ethernet.
Preferably, the power grid dispatching system of the wind power plant is generally provided by a third party and called as a power grid dispatching system; the systems are mutually independent, so that the positions of active power acquisition points acquired by the two systems are not uniform, the factory of the wind turbine generator acquires and controls the output Pfm of the wind turbine generator, and the third party factory acquires and controls the active power Psm of a power grid point; the calculation formula is as follows:
Psl＝Pfm-Psm；
psl is the active power lost by the line, and is always a positive number due to the law of conservation of physical energy in nature.
An active power control distribution algorithm for improving the generated energy during the power limit of a wind power plant comprises the following steps:
1) acquiring parameters, wherein a user is required to newly increase a distance parameter from a wind power plant booster station to an accessed unit before the wind power plant energy management platform is put into use, and the wind power plant energy management platform refers to the line distance from the unit to the wind power plant booster station as a main factor during active power control;
2) obtaining the full active power output PacAfter the energy management platform operates, the full-field active power output Pac of the access unit of the energy management platform can be periodically obtained, and when the full-field active power output Pac is obtained, the full-field unit can be sequenced according to the distance and the state of the unit to form control queues Qk, Qy, Qnk and Qfk;
3) when receiving a scheduling active power instruction value Psp, the energy management platform compares the value Psp with Pac; if Pac is smaller than Psp, the wind power plant generates electricity indefinitely, all units in the wind power plant can generate electricity freely, the energy management platform can automatically skip the active power distribution logic, and at the moment, the active power control system can issue a rated power instruction value to the units. Each unit can not run in a limited power mode; when the Pac is larger than the Psp, the deviation value is Pdev which is equal to Pac-Psp, the wind power plant generates power by the super power grid dispatching instruction value, the active power output of the whole plant needs to be reduced, the energy management platform needs to execute active power distribution logic, and a unit with a higher Que priority is controlled preferentially. The energy management platform calculates how many machine groups with higher priority in the control queue Que need to have active power output to meet the condition that Pac is less than or equal to Psp according to the value of the deviation value Pdev; the calculation logic is as follows:
a. taking out the active power output Pn [0] of the first unit Que [0] in the Que;
b. calculating the value of the maximum reducible active power Pval of the unit Que [0] according to the operation control logic of the unit;
c. if Pval is larger than Pdev, the energy management platform controls the unit Que [0] to reduce the Pdev active power output, and if Pac is smaller than or equal to Psp, the control distribution logic is finished. The Que [0] is continuously kept in the Que queue;
d. if Pval is smaller than Pdev, the energy management platform controls the unit Que [0] to reduce Pval active power output, and the unit Que [0] is enabled to operate in a power generation mode with minimum capacity. The energy management platform will automatically reject the unit Que [0] from the Que queue. Adding Qfk queue, at this time, the unit Que [1] will automatically move to the first position of the Que queue, the sequence is the unit Que [0 ];
e. the energy management platform automatically calculates Pnew dev (calculation formula Pdev ═ Pac-Psp), and then executes the logic of step 1;
f. when Pac is less than or equal to Psp, ending the control distribution logic;
g. if no unit exists in the Que queue, but Pac is larger than Psp, the energy management platform gives an audible and visual alarm to the client at the moment to remind the client that the power grid dispatching instruction cannot be met for power generation.
h. In the distribution executing process, the energy management platform can adjust the queue to which the unit belongs in real time according to the state and the distance of the unit.
Preferably, the Qy is an uncontrollable unit, the unit is a sample board machine and cannot participate in power control operation, and a control instruction received by the unit is a rated power; qnk is an uncontrollable machine set, which is a non-sample machine set and has no generator set and can not participate in power control operation, and the control instruction received by the machine set is the minimum power instruction value; qk is a controllable unit, the state of the unit is the unit which generates power and can be controlled by an active power control system, and Que [0] is the unit with the highest priority, namely the unit which is farthest away from the booster station line of the wind power plant. Que [ n ] is a unit with the lowest priority, namely a unit closest to a line of a booster station of the wind power plant; qfk is a set of Qk set without descending control space after control, and the set of the type is the lowest control set.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the prior art, the active power control distribution algorithm for improving the power generation capacity of the wind power plant during the power limiting has the advantages that the distance between the active power control distribution algorithm and the line of the booster station of the wind power plant is used as an important control priority factor, a unit far away from the line of the booster station of the wind power plant is preferentially controlled during the power limiting operation, the unit near the line of the booster station of the wind power plant is controlled when the dispatching instruction requirement is not met, specifically, the active power control priority of the unit near the line of the booster station of the wind power plant is lower when a plurality of units run for power generation, and the active power output of the type of unit is limited only when the power limiting instruction is not met and the unit with higher priority is controlled; therefore, the active power line loss is reduced, the active power output of the wind power plant is improved, and finally the generated energy of the wind power plant is improved.
Drawings
FIG. 1 is a flow chart illustrating the process of the present invention;
FIG. 2 is a schematic view of a wind farm structure according to the present invention.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1-2, the present invention provides a technical solution: an active power control distribution algorithm for improving the generated energy during the power limit of a wind power plant comprises the following steps:
1) acquiring parameters, wherein a user is required to newly increase a distance parameter from a wind power plant booster station to an accessed unit before the wind power plant energy management platform is put into use, and the wind power plant energy management platform refers to the line distance from the unit to the wind power plant booster station as a main factor during active power control;
2) obtaining the full active power output PacAfter the energy management platform operates, the full-field active power output Pac of the access unit of the energy management platform can be periodically obtained, and when the full-field active power output Pac is obtained, the full-field unit can be sequenced according to the distance and the state of the unit to form control queues Qk, Qy, Qnk and Qfk;
3) when receiving a scheduling active power instruction value Psp, the energy management platform compares the value Psp with Pac; if Pac is smaller than Psp, the wind power plant generates electricity indefinitely, all units in the wind power plant can generate electricity freely, the energy management platform can automatically skip the active power distribution logic, and at the moment, the active power control system can issue a rated power instruction value to the units. Each unit can not run in a limited power mode; when the Pac is larger than the Psp, the deviation value is Pdev which is equal to Pac-Psp, the wind power plant generates power by the super power grid dispatching instruction value, the active power output of the whole plant needs to be reduced, the energy management platform needs to execute active power distribution logic, and a unit with a higher Que priority is controlled preferentially. The energy management platform calculates how many machine groups with higher priority in the control queue Que need to have active power output to meet the condition that Pac is less than or equal to Psp according to the value of the deviation value Pdev; the calculation logic is as follows:
a. taking out the active power output Pn [0] of the first unit Que [0] in the Que;
b. calculating the value of the maximum reducible active power Pval of the unit Que [0] according to the operation control logic of the unit;
c. if Pval is larger than Pdev, the energy management platform controls the unit Que [0] to reduce the Pdev active power output, and if Pac is smaller than or equal to Psp, the control distribution logic is finished. The Que [0] is continuously kept in the Que queue;
d. if Pval is smaller than Pdev, the energy management platform controls the unit Que [0] to reduce Pval active power output, and the unit Que [0] is enabled to operate in a power generation mode with minimum capacity. The energy management platform will automatically reject the unit Que [0] from the Que queue. Adding Qfk queue, at this time, the unit Que [1] will automatically move to the first position of the Que queue, the sequence is the unit Que [0 ];
e. the energy management platform automatically calculates Pnew dev (calculation formula Pdev ═ Pac-Psp), and then executes the logic of step 1;
f. when Pac is less than or equal to Psp, ending the control distribution logic;
g. if no unit exists in the Que queue, but Pac is larger than Psp, the energy management platform gives an audible and visual alarm to the client at the moment to remind the client that the power grid dispatching instruction cannot be met for power generation.
h. In the distribution executing process, the energy management platform can adjust the queue to which the unit belongs in real time according to the state and the distance of the unit;
qy is an uncontrollable unit which is a sample board machine and cannot participate in power control operation, and a control instruction received by the unit is rated power; qnk is an uncontrollable machine set, which is a non-sample machine set and has no generator set and can not participate in power control operation, and the control instruction received by the machine set is the minimum power instruction value; qk is a controllable unit, the state of the unit is the unit which generates power and can be controlled by an active power control system, and Que [0] is the unit with the highest priority, namely the unit which is farthest away from the booster station line of the wind power plant. Que [ n ] is a unit with the lowest priority, namely a unit closest to a line of a booster station of the wind power plant; qfk is a set of Qk set without descending control space after control, and the set of the type is the lowest control set.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides an active power control distribution algorithm of generated energy when improving wind-powered electricity generation field limit power, includes wind generating set, ethernet switch, energy management platform and electric wire netting dispatch system, its characterized in that: the wind generating set is electrically connected with the Ethernet switch through optical fibers, the Ethernet switch is electrically connected with the energy management platform in a bidirectional mode through the Ethernet, and the energy management platform is electrically connected with the power grid dispatching system in the bidirectional mode through the Ethernet.
2. The active power control distribution algorithm for improving the power generation amount during the power limit of the wind power plant as claimed in claim 1, characterized by comprising the following steps:
1) acquiring parameters, wherein a user is required to newly increase a distance parameter from a wind power plant booster station to an accessed unit before the wind power plant energy management platform is put into use, and the wind power plant energy management platform refers to the line distance from the unit to the wind power plant booster station as a main factor during active power control;
2) obtaining the full active power output PacAfter the energy management platform operates, the full-field active power output Pac of the access unit of the energy management platform can be periodically obtained, and when the full-field active power output Pac is obtained, the full-field unit can be sequenced according to the distance and the state of the unit to form control queues Qk, Qy, Qnk and Qfk;
3) when receiving a scheduling active power instruction value Psp, the energy management platform compares the value Psp with Pac; if Pac is smaller than Psp, the wind power plant generates electricity indefinitely, all units in the wind power plant can generate electricity freely, the energy management platform can automatically skip the active power distribution logic, and at the moment, the active power control system can issue a rated power instruction value to the units. Each unit can not run in a limited power mode; when the Pac is larger than the Psp, the deviation value is Pdev which is equal to Pac-Psp, the wind power plant generates power by the super power grid dispatching instruction value, the active power output of the whole plant needs to be reduced, the energy management platform needs to execute active power distribution logic, and a unit with a higher Que priority is controlled preferentially. The energy management platform calculates how many machine groups with higher priority in the control queue Que need to have active power output to meet the condition that Pac is less than or equal to Psp according to the value of the deviation value Pdev; the calculation logic is as follows:
a. taking out the active power output Pn [0] of the first unit Que [0] in the Que;
b. calculating the value of the maximum reducible active power Pval of the unit Que [0] according to the operation control logic of the unit;
c. if Pval is larger than Pdev, the energy management platform controls the unit Que [0] to reduce the Pdev active power output, and if Pac is smaller than or equal to Psp, the control distribution logic is finished. The Que [0] is continuously kept in the Que queue;
d. if Pval is smaller than Pdev, the energy management platform controls the unit Que [0] to reduce Pval active power output, and the unit Que [0] is enabled to operate in a power generation mode with minimum capacity. The energy management platform will automatically reject the unit Que [0] from the Que queue. Adding Qfk queue, at this time, the unit Que [1] will automatically move to the first position of the Que queue, the sequence is the unit Que [0 ];
e. the energy management platform automatically calculates Pnew dev (calculation formula Pdev ═ Pac-Psp), and then executes the logic of step 1;
f. when Pac is less than or equal to Psp, ending the control distribution logic;
g. if no unit exists in the Que queue, but Pac is larger than Psp, the energy management platform gives an audible and visual alarm to the client at the moment to remind the client that the power grid dispatching instruction cannot be met for power generation.
h. In the distribution executing process, the energy management platform can adjust the queue to which the unit belongs in real time according to the state and the distance of the unit.
3. The active power control distribution algorithm for improving the power generation amount during the power limit of the wind power plant according to claim 1, characterized in that: the power grid dispatching system of the wind power plant is generally provided by a third party and called as a power grid dispatching system; the systems are mutually independent, so that the positions of active power acquisition points acquired by the two systems are not uniform, the factory of the wind turbine generator acquires and controls the output Pfm of the wind turbine generator, and the third party factory acquires and controls the active power Psm of a power grid point; the calculation formula is as follows:
Psl＝Pfm-Psm；
psl is the active power lost by the line, and is always a positive number due to the law of conservation of physical energy in nature.
4. The active power control distribution algorithm for improving the power generation amount during the power limit of the wind power plant according to claim 2, characterized in that: qy is an uncontrollable unit which is a sample board machine and cannot participate in power control operation, and a control instruction received by the unit is rated power; qnk is an uncontrollable machine set, which is a non-sample machine set and has no generator set and can not participate in power control operation, and the control instruction received by the machine set is the minimum power instruction value; qk is a controllable unit, the state of the unit is the unit which generates power and can be controlled by an active power control system, and Que [0] is the unit with the highest priority, namely the unit which is farthest away from the booster station line of the wind power plant. Que [ n ] is a unit with the lowest priority, namely a unit closest to a line of a booster station of the wind power plant; qfk is a set of Qk set without descending control space after control, and the set of the type is the lowest control set.
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| CN102386623A (en) * | 2011-07-07 | 2012-03-21 | 浙江运达风电股份有限公司 | Method for reducing loss of wind farm |
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| CN102386623A (en) * | 2011-07-07 | 2012-03-21 | 浙江运达风电股份有限公司 | Method for reducing loss of wind farm |
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| CN105244922A (en) * | 2015-11-13 | 2016-01-13 | 东北电力大学 | Double-fed wind power plant group active power output optimization distribution method in wind limit case |
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