CN112510764A - Control method and system for reactive power of wind power plant, electronic equipment and storage medium - Google Patents
Control method and system for reactive power of wind power plant, electronic equipment and storage medium Download PDFInfo
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- CN112510764A CN112510764A CN202011347241.5A CN202011347241A CN112510764A CN 112510764 A CN112510764 A CN 112510764A CN 202011347241 A CN202011347241 A CN 202011347241A CN 112510764 A CN112510764 A CN 112510764A
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/381—Dispersed generators
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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
- H02J3/50—Controlling the sharing of the out-of-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
- 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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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a method and a system for controlling reactive power of a wind power plant, electronic equipment and a storage medium. The method for controlling the reactive power of the wind power plant comprises the following steps: acquiring actual reactive power and target reactive power of a grid-connected point; if the actual reactive power does not reach the target reactive power, calculating reactive power to be distributed according to the target reactive power and reactive power generated by each uncontrollable fan in the wind power plant; and distributing the reactive power to be distributed to controllable fans in the wind power plant according to a preset rule. According to the invention, the reactive power to be distributed is distributed to the controllable fans in the wind power plant according to the preset rules, so that the reactive power and the voltage of the wind power plant can be controlled and adjusted. Furthermore, the invention provides a plurality of reactive power distribution modes, which can adapt to different requirements of different wind power plants and improve the flexibility of reactive power compensation of the wind power plants.
Description
Technical Field
The invention relates to the technical field of wind power, in particular to a method and a system for controlling reactive power of a wind power plant, electronic equipment and a storage medium.
Background
In order to ensure stable and reliable operation of the wind power plant, the wind power plant needs to perform reactive compensation on a sensitive electrical system composed of a wind driven generator, a transmission line, a transformer and the like, reduce energy loss caused by reactive transmission, adjust voltage fluctuation caused by wind speed change or reactive consumption, and maintain active and reactive proportional balance and voltage stability of the wind power plant. At present, the most used reactive power compensation device is a Static Var Generator (SVG), but the SVG has the defects of large area, high cost, high power consumption, low availability ratio and the like.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the above defects in the prior art, and provide a method and a system for controlling reactive power of a wind farm, an electronic device, and a storage medium.
The invention solves the technical problems through the following technical scheme:
the first aspect of the invention provides a method for controlling reactive power of a wind power plant, which comprises the following steps:
acquiring actual reactive power and target reactive power of a grid-connected point;
if the actual reactive power does not reach the target reactive power, calculating reactive power to be distributed according to the target reactive power and reactive power generated by each uncontrollable fan in the wind power plant;
and distributing the reactive power to be distributed to controllable fans in the wind power plant according to a preset rule.
Preferably, the step of obtaining the target reactive power specifically includes:
and if the actual voltage of the grid-connected point is not in the preset interval, entering a voltage regulation mode, and calculating the target reactive power according to the actual voltage.
Preferably, the preset rule is that the reactive power to be distributed is evenly distributed to controllable fans in the wind farm.
Preferably, the preset rule is that the reactive power to be distributed is distributed to each controllable fan in equal proportion according to the reactive available capacity of each controllable fan in the wind power plant.
Preferably, the preset rule is that the reactive power to be distributed is distributed to each controllable fan according to active power generated by each controllable fan of a normal grid in the wind farm.
Preferably, the control method further includes:
obtaining reactive power sent by each grid-connected loop;
and adjusting the reactive power distributed to each controllable fan according to the reactive power sent by each grid-connected loop.
Preferably, the control method further includes: and if the sum of the reactive available capacity of all the controllable fans in the wind power plant is lower than the reactive power to be distributed, sending a reactive power instruction to a reactive power compensation device so that the reactive power compensation device provides reactive power for a power grid.
A second aspect of the invention provides a control system for reactive power of a wind farm, comprising:
the first acquisition unit is used for acquiring the actual reactive power and the target reactive power of the grid-connected point;
the calculating unit is used for calculating reactive power to be distributed according to the target reactive power and reactive power generated by each uncontrollable fan in the wind power plant under the condition that the actual reactive power does not reach the target reactive power;
and the distribution unit is used for distributing the reactive power to be distributed to the controllable fans in the wind power plant according to a preset rule.
Preferably, the first obtaining unit is specifically configured to enter a voltage regulation mode when the actual voltage of the grid-connected point is not within a preset interval, and calculate the target reactive power according to the actual voltage.
Preferably, the preset rule is that the reactive power to be distributed is evenly distributed to controllable fans in the wind farm.
Preferably, the preset rule is that the reactive power to be distributed is distributed to each controllable fan in equal proportion according to the reactive available capacity of each controllable fan in the wind power plant.
Preferably, the preset rule is that the reactive power to be distributed is distributed to each controllable fan according to active power generated by each controllable fan of a normal grid in the wind farm.
Preferably, the control system further comprises:
the second acquisition unit is used for acquiring reactive power sent by each grid-connected loop;
and the adjusting unit is used for adjusting the reactive power distributed to each controllable fan according to the reactive power sent by each grid-connected loop.
Preferably, the control system further comprises a compensation unit for sending a reactive power instruction to the reactive power compensation device to make the reactive power compensation device provide reactive power to the grid in case the sum of the reactive available capacities of all controllable wind turbines in the wind farm is lower than the reactive power to be distributed.
A third aspect of the invention provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method for controlling reactive power of a wind farm according to the first aspect when executing the computer program.
A fourth aspect of the invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of controlling reactive power of a wind farm according to the first aspect.
The positive progress effects of the invention are as follows: the reactive power and the voltage of the wind power plant can be controlled and adjusted by obtaining the actual reactive power and the target reactive power of a grid-connected point, calculating the reactive power to be distributed according to the target reactive power and the reactive power generated by each uncontrollable fan in the wind power plant under the condition that the actual reactive power does not reach the target reactive power, and distributing the reactive power to be distributed to the controllable fans in the wind power plant according to preset rules. Furthermore, the invention provides a plurality of reactive power distribution modes, which can adapt to different requirements of different wind power plants and improve the flexibility of reactive power compensation of the wind power plants.
Drawings
Fig. 1 is a flowchart of a method for controlling reactive power of a wind farm according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of a voltage droop curve provided in embodiment 1 of the present invention.
Fig. 3 is a schematic view of a topological structure of wind power integration provided in embodiment 1 of the present invention.
Fig. 4 is a block diagram of a structure of a control system for reactive power of a wind farm according to embodiment 2 of the present invention.
Fig. 5 is a block diagram of an electronic device according to embodiment 3 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
The control method for the reactive power of the wind power plant provided by the embodiment of the invention utilizes the reactive power of the fan in the wind power plant to perform reactive power compensation, and can be applied to a control system for the reactive power of the wind power plant, wherein the control system for the reactive power of the wind power plant can be integrated in a wind power plant controller, so that the control speed of reactive power and voltage regulation and the adaptability of a control strategy are improved.
Example 1
The embodiment provides a method for controlling reactive power of a wind farm, as shown in fig. 1, including the following steps:
and S101, acquiring the actual reactive power and the target reactive power of the grid-connected point. In specific implementation, the actual reactive power of the grid-connected point is obtained by collecting the three-phase voltage and the three-phase current of the grid-connected point.
In an optional implementation manner of step S101, if the actual voltage of the grid-connected point is not within the preset interval, the grid-connected point enters a voltage regulation mode, and the target reactive power is calculated according to the actual voltage. In a specific implementation, the preset interval may be set according to actual conditions, for example, plus or minus 5% of the reference voltage may be set as a lower limit value and an upper limit value of the preset interval, respectively.
In this embodiment, the step of calculating the target reactive power according to the actual voltage of the grid-connected point specifically includes: and obtaining a reference value of reactive power superposition quantity according to the voltage/reactive droop curve, and superposing the reactive power generated by the current wind power plant to be used as the target reactive power. Fig. 2 is a schematic diagram for illustrating a voltage droop curve. In the example shown in fig. 2, Un is the nominal/rated voltage of the grid-connected point, i.e. the reference voltage, U is the actual voltage of the grid-connected point, and Ud + and Ud-are the upper limit and the lower limit of the voltage control dead zone, respectively, and can be configured by parameters, where [ Ud-, Ud + ] is the above-mentioned preset interval; k1 is a voltage-regulating droop coefficient of the ascending section, and k2 is a voltage-regulating droop system of the descending section, wherein k1 and k2 can be different or can be configured in parameters; q is the target reactive power obtained by looking up the curve, Qmax is the maximum reactive capacity of the wind farm, and-Qmax is the minimum reactive capacity of the wind farm. In this example, if the actual voltage U of the grid-connected point is not within the preset interval [ Ud-, Ud + ], the voltage regulation mode is entered, Q corresponding to U is searched according to the curve shown in fig. 2, and the reactive power currently generated by the wind farm is superimposed as the target reactive power.
In this embodiment, if the actual voltage of the grid-connected point is within the preset interval, the target reactive power may be obtained according to the reactive requirement of the power grid or the owner, specifically, the target reactive power is obtained through the SCADA system and the AVC system on the power grid side.
And S102, if the actual reactive power does not reach the target reactive power, calculating the reactive power to be distributed according to the target reactive power and the reactive power generated by each uncontrollable fan in the wind power plant.
It should be noted that the wind farm includes controllable wind turbines and uncontrollable wind turbines, where a controllable wind turbine means that active power/reactive power generated by a wind turbine is controllable, and specifically, the active power/reactive power generated by the wind turbine can be controlled by sending an active power instruction/reactive power instruction to the controllable wind turbine. The uncontrollable fan means that the active power/reactive power generated by the fan is uncontrollable, and the active power/reactive power generated by the fan cannot be controlled by sending an active power instruction/reactive power instruction to the uncontrollable fan.
In step S102, if the actual reactive power generated by the grid-connected point does not reach the target reactive power, reactive compensation is required, and in specific implementation, the difference between the target reactive power and the reactive power generated by each uncontrollable fan is the reactive power to be distributed.
And S103, distributing the reactive power to be distributed to controllable fans in the wind power plant according to a preset rule. The reactive power to be distributed is distributed to the controllable fans, so that reactive power and voltage of the wind power plant can be controlled and adjusted.
In an optional embodiment, the preset rule is to equally distribute the reactive power to be distributed to controllable wind turbines in the wind farm. In this embodiment, the same reactive power is distributed to each controllable fan. In a specific example, the reactive power to be distributed is 300Var, and the reactive power distributed to the controllable fans a1, a2, A3 and a4 in sequence is 75Var, 75Var and 75Var, respectively. It should be noted that, if the reactive power allocated to the controllable wind turbine is greater than the current available reactive capacity of the controllable wind turbine, the reactive power allocated to the controllable wind turbine is limited to the available reactive capacity.
In an optional embodiment, the preset rule is that the reactive power to be distributed is distributed to each controllable wind turbine in equal proportion according to the reactive available capacity of each controllable wind turbine in the wind farm. In the embodiment, the larger the reactive available capacity of the controllable fan is, the more reactive power is distributed to the controllable fan, so that the required reactive power is more accurately and reasonably sent out by the fan, the voltage fluctuation of a grid-connected point is further reduced, and the voltage stability of the grid-connected point is maintained. In a specific example, the reactive power to be distributed is 300Var, the reactive available capacity of the controllable fan a1 is 50Var, the reactive available capacity of the controllable fan a2 is 100Var, the reactive available capacity of the controllable fan A3 is 150Var, and the reactive available capacity of the controllable fan a4 is 200Var, so that the reactive powers distributed to the controllable fans a1, a2, A3, and a4 in sequence are 30Var, 60Var, 90Var, and 120Var, respectively.
In an optional embodiment, the preset rule is that the reactive power to be distributed is distributed to each controllable wind turbine according to active power generated by each controllable wind turbine normally connected to the grid in the wind farm. In specific implementation, different priorities can be set for fans generating active power in all controllable fans in a normal grid, and reactive power is preferentially distributed to fans with higher priorities. In an example of the specific implementation, the priority of the wind turbine generating non-zero active power is set to be higher than that of the wind turbine generating zero active power, that is, reactive power is preferentially distributed to the controllable wind turbine generating non-zero active power, and when the available reactive capacity of the wind turbine generating non-zero active power is not enough, reactive power is distributed to the controllable wind turbine generating zero active power. In specific implementation, if the sum of the available reactive capacities of all the controllable fans generating non-zero active power can meet the reactive power to be distributed, the reactive power to be distributed is distributed to the controllable fans generating non-zero active power in equal proportion according to the available reactive capacities of the controllable fans generating non-zero active power; if the sum of the available reactive capacity of all the controllable fans generating the non-zero active power can not meet the reactive power to be distributed, distributing the reactive power which is the same as the available reactive capacity of each controllable fan to each controllable fan generating the non-zero active power, and distributing the residual reactive power to be distributed to each controllable fan generating the zero active power in equal proportion according to the available reactive capacity of each controllable fan generating the zero active power.
The active power generating method comprises the steps that the active power generating mode is a non-zero active power mode, the active power generating mode is a normal power generating mode, the active power generating mode is a zero active power mode, the active power generating mode is a zero standby mode, the standby mode is connected with a power grid under the condition of no wind, available reactive power is achieved, and the active power generating mode is zero or approximately equal to zero.
The embodiment provides multiple modes for distributing reactive power to the controllable fans, can adapt to different requirements of different wind power plants, and improves the flexibility of reactive power compensation of the wind power plants.
In an optional embodiment, the control method further includes the following steps:
and step S104, obtaining reactive power sent by each grid-connected loop. In specific implementation, the actual reactive power sent by each grid-connected loop is obtained by collecting the three-phase voltage and the three-phase current of each grid-connected loop.
And S105, adjusting the reactive power distributed to each controllable fan according to the reactive power sent by each grid-connected loop. In this embodiment, the reactive power distributed to each controllable fan is adjusted according to the reactive power sent by each grid-connected loop, that is, finer reactive power distribution is performed on each controllable fan on different grid-connected loops, so that the direction and the magnitude of the reactive power sent by each grid-connected loop are within a reasonable range, and the situation that the power factor on some grid-connected loops deviates from the reasonable range and the reactive power sent by some grid-connected loops is absorbed by other grid-connected loops, which results in that reactive power compensation cannot be performed on grid-connected points is avoided.
In an optional embodiment, the reactive capability of the wind turbine in the wind farm cannot meet the target reactive power, and the control method further includes: and if the sum of the reactive available capacity of all the controllable fans in the wind power plant is lower than the reactive power to be distributed, sending a reactive power instruction to a reactive power compensation device so that the reactive power compensation device provides reactive power for a power grid.
In a specific implementation, the reactive power compensation device is connected to the grid through a switch, and the reactive power compensation device is enabled to provide reactive power to the grid by sending a control signal to the switch to enable the switch to be closed and sending a reactive power instruction to the reactive power compensation device. In a specific implementation, the reactive power to be distributed to the reactive compensation device may be obtained according to a difference between the reactive power to be distributed and a sum of the reactive available capacities of all the controllable fans, where the reactive power instruction carries the reactive power to be distributed to the reactive compensation device.
The reactive power compensation device may be SVG, Static Var Compensator (SVC), or the like.
Fig. 3 is a schematic diagram for illustrating a structure of a wind power grid. As shown in fig. 2, each fan in the wind farm is boosted to 35kV once, i.e. the in-farm level is 35kV, and is composed of n grid-connected loops, and is boosted to 220kV twice to realize grid connection. The wind field controller is directly connected with each fan, each grid-connected loop, a grid-connected point, the SCADA system, the AVC system on the power grid side and the reactive power compensation device. The wind field controller acquires reactive power and active power emitted by each fan by acquiring data transmitted by the main control of each fan, acquires reactive power emitted by each grid-connected loop by acquiring voltage and current of each grid-connected loop, acquires actual reactive power of a grid-connected point by acquiring voltage and current of the grid-connected point, can acquire target reactive power from a user or an AVC system on the power grid side, and can distribute reactive power to each controllable fan in a wind electric field in different distribution modes by calculating, judging and processing. In addition, under the condition that the reactive power of a fan in the wind power plant cannot meet the target reactive power, the reactive power compensation device is controlled to be connected into the power grid so as to provide the reactive power which cannot be met by the wind power plant for the power grid.
Example 2
The present embodiment provides a control system 30 for reactive power of a wind farm, as shown in fig. 4, including a first obtaining unit 31, a calculating unit 32, and a distributing unit 33.
The first obtaining unit is used for obtaining the actual reactive power and the target reactive power of the grid-connected point. In specific implementation, the actual reactive power of the grid-connected point is obtained by collecting the three-phase voltage and the three-phase current of the grid-connected point.
In an optional implementation manner, the first obtaining unit is configured to enter a voltage regulation mode when an actual voltage of the grid-connected point is not within a preset interval, and calculate the target reactive power according to the actual voltage. In this embodiment, the step of calculating the target reactive power according to the actual voltage of the grid-connected point specifically includes: and obtaining a reference value of reactive power superposition quantity according to the voltage/reactive droop curve, and superposing the reactive power generated by the current wind power plant to be used as the target reactive power.
If the actual voltage of the grid-connected point is within the preset interval, the target reactive power can be obtained according to the reactive requirement of the power grid or an owner, and specifically, the target reactive power is obtained through an SCADA system and an AVC system on the power grid side.
And the calculating unit is used for calculating the reactive power to be distributed according to the target reactive power and the reactive power generated by each uncontrollable fan in the wind power plant under the condition that the actual reactive power does not reach the target reactive power.
It should be noted that the wind farm includes controllable wind turbines and uncontrollable wind turbines, where a controllable wind turbine means that active power/reactive power generated by a wind turbine is controllable, and specifically, the active power/reactive power generated by the wind turbine can be controlled by sending an active power instruction/reactive power instruction to the controllable wind turbine. The uncontrollable fan means that the active power/reactive power generated by the fan is uncontrollable, and the active power/reactive power generated by the fan cannot be controlled by sending an active power instruction/reactive power instruction to the uncontrollable fan.
In this embodiment, if the actual reactive power generated by the grid-connected point does not reach the target reactive power, reactive compensation is required, and in a specific implementation, the difference between the target reactive power and the reactive power generated by each uncontrollable fan is the reactive power to be distributed.
The distribution unit is used for distributing the reactive power to be distributed to controllable fans in the wind power plant according to preset rules.
In an optional embodiment, the preset rule is to equally distribute the reactive power to be distributed to controllable wind turbines in the wind farm. In this embodiment, the same reactive power is distributed to each controllable fan. It should be noted that, if the reactive power allocated to the controllable wind turbine is greater than the current available reactive capacity of the controllable wind turbine, the reactive power allocated to the controllable wind turbine is limited to the available reactive capacity.
In an optional embodiment, the preset rule is that the reactive power to be distributed is distributed to each controllable wind turbine in equal proportion according to the reactive available capacity of each controllable wind turbine in the wind farm. In the embodiment, the larger the reactive available capacity of the controllable fan is, the more reactive power is distributed to the controllable fan, so that the required reactive power is more accurately and reasonably sent out by the fan, the voltage fluctuation of a grid-connected point is further reduced, and the voltage stability of the grid-connected point is maintained.
In an optional embodiment, the preset rule is that the reactive power to be distributed is distributed to each controllable wind turbine according to active power generated by each controllable wind turbine normally connected to the grid in the wind farm. In specific implementation, different priorities can be set for fans generating active power in all controllable fans in a normal grid, and reactive power is preferentially distributed to fans with higher priorities. In an example of the specific implementation, the priority of the wind turbine generating non-zero active power is set to be higher than that of the wind turbine generating zero active power, that is, reactive power is preferentially distributed to the controllable wind turbine generating non-zero active power, and when the available reactive capacity of the wind turbine generating non-zero active power is not enough, reactive power is distributed to the controllable wind turbine generating zero active power. In specific implementation, if the sum of the available reactive capacities of all the controllable fans generating non-zero active power can meet the reactive power to be distributed, the reactive power to be distributed is distributed to the controllable fans generating non-zero active power in equal proportion according to the available reactive capacities of the controllable fans generating non-zero active power; if the sum of the available reactive capacity of all the controllable fans generating the non-zero active power can not meet the reactive power to be distributed, distributing the reactive power which is the same as the available reactive capacity of each controllable fan to each controllable fan generating the non-zero active power, and distributing the residual reactive power to be distributed to each controllable fan generating the zero active power in equal proportion according to the available reactive capacity of each controllable fan generating the zero active power.
The active power generating method comprises the steps that the active power generating mode is a non-zero active power mode, the active power generating mode is a normal power generating mode, the active power generating mode is a zero active power mode, the active power generating mode is a zero standby mode, the standby mode is connected with a power grid under the condition of no wind, available reactive power is achieved, and the active power generating mode is zero or approximately equal to zero.
The embodiment provides multiple modes for distributing reactive power to the controllable fans, can adapt to different requirements of different wind power plants, and improves the flexibility of reactive power compensation of the wind power plants.
In an alternative embodiment, as shown in fig. 4, the control system further includes a second obtaining unit 34 and an adjusting unit 35.
The second obtaining unit is used for obtaining reactive power sent by each grid-connected loop. In specific implementation, the actual reactive power sent by each grid-connected loop is obtained by collecting the three-phase voltage and the three-phase current of each grid-connected loop.
The adjusting unit is used for adjusting the reactive power distributed to each controllable fan according to the reactive power sent by each grid-connected loop. In this embodiment, the reactive power distributed to each controllable fan is adjusted according to the reactive power sent by each grid-connected loop, that is, finer reactive power distribution is performed on each controllable fan on different grid-connected loops, so that the direction and the magnitude of the reactive power sent by each grid-connected loop are within a reasonable range, and the situation that the power factor on some grid-connected loops deviates from the reasonable range and the reactive power sent by some grid-connected loops is absorbed by other grid-connected loops, which results in that reactive power compensation cannot be performed on grid-connected points is avoided.
In an alternative embodiment, in which the reactive capacity of the wind turbines in the wind farm cannot meet the target reactive power, as shown in fig. 4, the control system further includes a compensation unit 36, configured to send a reactive power instruction to the reactive power compensation device to enable the reactive power compensation device to provide reactive power to the grid, if the sum of the reactive available capacities of all controllable wind turbines in the wind farm is lower than the reactive power to be distributed.
In a specific implementation, the reactive power compensation device is connected to the grid through a switch, and the reactive power compensation device is enabled to provide reactive power to the grid by sending a control signal to the switch to enable the switch to be closed and sending a reactive power instruction to the reactive power compensation device. In a specific implementation, the reactive power to be distributed to the reactive compensation device may be obtained according to a difference between the reactive power to be distributed and a sum of the reactive available capacities of all the controllable fans, where the reactive power instruction carries the reactive power to be distributed to the reactive compensation device.
The reactive power compensation device may be SVG, Static Var Compensator (SVC), or the like.
Example 3
Fig. 5 is a schematic structural diagram of an electronic device provided in this embodiment. The electronic device comprises a memory, a processor, a computer program stored on the memory and executable on the processor, and a plurality of subsystems for realizing different functions, wherein the processor realizes the control method of the reactive power of the wind farm of the embodiment 1 when executing the program. The electronic device 3 shown in fig. 5 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiment of the present invention.
The components of the electronic device 3 may include, but are not limited to: the at least one processor 4, the at least one memory 5, and a bus 6 connecting the various system components (including the memory 5 and the processor 4).
The bus 6 includes a data bus, an address bus, and a control bus.
The memory 5 may include volatile memory, such as Random Access Memory (RAM) and/or cache memory, and may further include Read Only Memory (ROM).
The memory 5 may also include a program/utility having a set (at least one) of program modules including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
The processor 4 executes various functional applications and data processing, such as a control method of reactive power of a wind farm according to embodiment 1 of the present invention, by running a computer program stored in the memory 5.
The electronic device 3 may also communicate with one or more external devices 7, such as a keyboard, pointing device, etc. Such communication may be via an input/output (I/O) interface 8. Also, the electronic device 3 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet) via the network adapter 9. As shown in fig. 5, the network adapter 9 communicates with other modules of the electronic device 3 via the bus 6. It should be appreciated that although not shown in FIG. 5, other hardware and/or software modules may be used in conjunction with the electronic device 3, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems, etc.
It should be noted that although in the above detailed description several units/modules or sub-units/modules of the electronic device are mentioned, such a division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more of the units/modules described above may be embodied in one unit/module according to embodiments of the invention. Conversely, the features and functions of one unit/module described above may be further divided into embodiments by a plurality of units/modules.
Example 4
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the method of controlling reactive power of a wind farm of embodiment 1.
More specific examples, among others, that the readable storage medium may employ may include, but are not limited to: a portable disk, a hard disk, random access memory, read only memory, erasable programmable read only memory, optical storage device, magnetic storage device, or any suitable combination of the foregoing.
In a possible embodiment, the invention can also be implemented in the form of a program product comprising program code for causing a terminal device to execute a control method for wind farm reactive power implementing embodiment 1, when said program product is run on said terminal device.
Where program code for carrying out the invention is written in any combination of one or more programming languages, the program code may be executed entirely on the user device, partly on the user device, as a stand-alone software package, partly on the user device and partly on a remote device or entirely on the remote device.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. A method for controlling reactive power of a wind power plant is characterized by comprising the following steps:
acquiring actual reactive power and target reactive power of a grid-connected point;
if the actual reactive power does not reach the target reactive power, calculating reactive power to be distributed according to the target reactive power and reactive power generated by each uncontrollable fan in the wind power plant;
and distributing the reactive power to be distributed to controllable fans in the wind power plant according to a preset rule.
2. The control method according to claim 1, wherein the step of obtaining the target reactive power specifically comprises:
and if the actual voltage of the grid-connected point is not in the preset interval, entering a voltage regulation mode, and calculating the target reactive power according to the actual voltage.
3. The control method according to claim 1, characterized in that the preset rule is to distribute the reactive power to be distributed evenly to the controllable fans in a wind farm; alternatively, the first and second electrodes may be,
the preset rule is that the reactive power to be distributed is distributed to each controllable fan in equal proportion according to the reactive available capacity of each controllable fan in the wind power plant; alternatively, the first and second electrodes may be,
the preset rule is that the reactive power to be distributed is distributed to the controllable fans according to the active power generated by the controllable fans which are normally connected with the grid in the wind power plant.
4. The control method according to any one of claims 1 to 3, characterized by further comprising:
obtaining reactive power sent by each grid-connected loop;
adjusting reactive power distributed to each controllable fan according to the reactive power sent by each grid-connected loop;
and/or the presence of a gas in the gas,
the control method further comprises the following steps: and if the sum of the reactive available capacity of all the controllable fans in the wind power plant is lower than the reactive power to be distributed, sending a reactive power instruction to a reactive power compensation device so that the reactive power compensation device provides reactive power for a power grid.
5. A control system for reactive power of a wind farm, comprising:
the first acquisition unit is used for acquiring the actual reactive power and the target reactive power of the grid-connected point;
the calculating unit is used for calculating reactive power to be distributed according to the target reactive power and reactive power generated by each uncontrollable fan in the wind power plant under the condition that the actual reactive power does not reach the target reactive power;
and the distribution unit is used for distributing the reactive power to be distributed to the controllable fans in the wind power plant according to a preset rule.
6. The control system according to claim 5, wherein the first obtaining unit is specifically configured to enter a voltage regulation mode when an actual voltage of the grid-connected point is not within a preset interval, and calculate the target reactive power according to the actual voltage.
7. The control system of claim 5, wherein the preset rule is to evenly distribute the reactive power to be distributed to controllable wind turbines in a wind farm; alternatively, the first and second electrodes may be,
the preset rule is that the reactive power to be distributed is distributed to each controllable fan in equal proportion according to the reactive available capacity of each controllable fan in the wind power plant; alternatively, the first and second electrodes may be,
the preset rule is that the reactive power to be distributed is distributed to the controllable fans according to the active power generated by the controllable fans which are normally connected with the grid in the wind power plant.
8. The control system of any one of claims 5-7, further comprising:
the second acquisition unit is used for acquiring reactive power sent by each grid-connected loop;
the adjusting unit is used for adjusting the reactive power distributed to each controllable fan according to the reactive power sent by each grid-connected loop;
and/or the presence of a gas in the gas,
the control system further comprises a compensation unit, which is used for sending a reactive power instruction to a reactive power compensation device to enable the reactive power compensation device to provide reactive power to the power grid under the condition that the sum of the reactive available capacity of all the controllable fans in the wind power plant is lower than the reactive power to be distributed.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of controlling reactive power of a wind farm according to any of claims 1-4 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out a method of controlling reactive power of a wind farm according to any of the claims 1-4.
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