CN115588999B - AVC control strategy method suitable for three-station-in-one energy storage wind power station - Google Patents

AVC control strategy method suitable for three-station-in-one energy storage wind power station Download PDF

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CN115588999B
CN115588999B CN202211568259.7A CN202211568259A CN115588999B CN 115588999 B CN115588999 B CN 115588999B CN 202211568259 A CN202211568259 A CN 202211568259A CN 115588999 B CN115588999 B CN 115588999B
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reactive power
side converter
fan
energy storage
reserve
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CN115588999A (en
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罗隆福
田野
欧阳志国
马芳
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Hunan Huada Electrician Hi Tech Co ltd
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Hunan Huada Electrician Hi Tech Co ltd
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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
    • 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
    • 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
    • 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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses an AVC control strategy method suitable for a three-station-in-one energy storage wind power station. And then, performing double-layer judgment, namely real-time voltage line crossing judgment and next-period expected voltage line crossing judgment. And then different action sequences are given according to the result judged by the real-time fault judgment and by combining the real-time and expected reactive power storage of the reactive power equipment. And finally, after the voltage regulation action is finished, redistributing the reactive power between the devices and between the fan groups. The invention can fully exert the reactive power potential and the characteristics of each device on the premise of not influencing the maximum output of the active power of the 'three-station-in-one' wind power station, safely, stably and efficiently regulate the voltage of a grid-connected point, and simultaneously can avoid repeated operation of the devices and waste of the reactive power.

Description

AVC control strategy method suitable for three-station-in-one energy storage wind power station
Technical Field
The invention relates to the field of new energy distribution and energy storage power station control, in particular to an AVC control strategy method suitable for a three-station-in-one energy storage wind power station.
Background
With the increasing attention to energy problems, new energy power generation technology is gradually developed and applied in engineering. The wind power generation technology has fewer limitations compared with other new energy power generation technologies, and wind resources in places such as land hills and plateaus or offshore areas are relatively abundant, so the wind power generation technology becomes a mainstream new energy power generation technology. However, unlike thermal power generation and nuclear power generation, wind power has no controllable scheduling property on the premise of fully utilizing wind resources due to large fluctuation and randomness of the wind resources. With the large-scale grid connection of wind power generation, the power generation proportion of the wind power generation increases year by year, and the volatility and randomness of the wind power generation also bring a serious challenge to the safe dispatching and stable operation of a power system.
In order to improve the related dilemma and difficulty brought by large-scale wind power generation grid connection, a wind power-energy storage technology is proposed and deeply researched. Energy storage technologies represented by energy storage batteries are also well accepted and accepted by power systems, and wind power stations including energy storage power stations are gradually listed in planning and grid-connected construction. The intervention of the energy storage device can regulate and control the grid-connected active power of the wind power station, so that the wind power station has considerable schedulability, and can track and report a power generation plan curve of a scheduling center in advance. Meanwhile, the system can provide auxiliary services such as primary frequency modulation, voltage regulation, inertia and the like. The topological structure of the wind power station integrating three stations, namely the induction filtering booster station, the cluster wind power station and the energy storage station, is provided, and the problems of wind power fluctuation, harmonic pollution, reactive power shortage and the like of the wind power station can be effectively solved. Automatic Voltage Control (AVC) is a basic function that all power stations should have, and it can monitor the voltage of the power station grid connection point in real time and automatically adjust by using a controllable reactive power source. However, after the three-station-in-one wind power station is provided with the energy storage device, the function of the original SVG and other reactive voltage regulation devices can be replaced due to the rapid regulation characteristic of energy storage, so how the reactive power reserve margin of the energy storage device is effectively exerted also puts requirements on reactive power compensation and voltage regulation control strategies in the station. Meanwhile, the method is also a difficult problem of how to fully play the active role of the energy storage power station and reasonably plan the coordination control of multiple reactive power sources so as to meet the AVC control strategy of the wind power station.
Disclosure of Invention
The technical problems that reactive power equipment utilization is insufficient, repeated oscillation is adjusted, active power output is influenced and the like due to the fact that reactive power equipment (an energy storage PCS, a double-fed fan back-to-back converter, a booster station filtering and reactive power compensation device and a booster station main transformer on-load tap changer (OTLC) are various and reactive power storage of part of reactive power sources is coupled with active power output at present are solved. The invention provides an AVC control strategy method suitable for a three-station-in-one energy storage wind power station.
In order to achieve the technical purpose, the technical scheme of the invention is that,
an AVC control strategy method suitable for a three-station-in-one energy storage wind power station comprises the following steps:
acquiring real-time electrical data of a power station including real-time grid-connected point voltage, reactive power reserve and total reactive power reserve of each device, and estimating related parameters including grid-connected point voltage expected value, energy storage station active power output and each fan predicted wind power in the next period by combining ultra-short-term wind power prediction data;
step two, judging whether the voltage of the real-time grid-connected point is within a reference voltage instruction range, and if so, entering step three; otherwise, entering the step four;
step three, calculating a voltage expected value of a grid-connected point in the next time period according to the ultra-short term wind power prediction data, judging whether the voltage expected value is within a reference voltage instruction range, if so, not adjusting, and returning to the step one; otherwise, entering the step five;
step four, judging whether the real-time grid-connected point voltage exceeds the upper limit of a reference voltage instruction or is lower than the lower limit of the reference voltage instruction, and entering step six if the real-time grid-connected point voltage exceeds the upper limit; otherwise, entering a step seven;
step five, judging whether the grid-connected point voltage expected value exceeds the upper limit of a reference voltage instruction or is lower than the lower limit of the reference voltage instruction, and entering the step eight if the grid-connected point voltage expected value exceeds the upper limit; otherwise, entering the step nine;
step six, judging whether the total reserve of the reactive power is smaller than the reactive power shortage, if so, performing a gear shifting action on a main transformer of the booster station, and returning to the step one; otherwise, equipment with reactive power reserve is put into the system to carry out reactive power output and FC in the running quit is used for filling reactive power shortage; then entering step ten;
step seven, judging whether the total reserve of the reactive power is smaller than the reactive power shortage, if so, performing a gear shifting action on a main transformer of the booster station, and returning to the step one; otherwise, equipment with reactive power reserve is thrown into the system to carry out reactive power output and FC operation to fill up the reactive power shortage; then entering step ten;
step eight, judging whether the output of the active power of the energy storage station in the next period is reduced, filling the reactive power deficit by the reactive power output of each device in sequence according to a preset first sequence when the output of the active power of the energy storage station in the next period is reduced, and filling the reactive power deficit by the reactive power output of each device in sequence according to a preset second sequence when the output of the active power of the energy storage station in the next period is reduced; then entering step ten;
step nine, comparing reactive power reserves of different equipment in the power station in the next period, and sequentially performing reactive power output in the prior sequence of the equipment with larger reactive power reserves in the next period to fill up reactive power shortage; then entering step ten;
and step ten, on the premise of ensuring that the reactive power shortage is filled, transferring the reactive power output to each fan of the power station, distributing the reactive power output of each fan by combining the predicted wind power of each fan in the next period and real-time reactive power storage, and finally returning to the step one for circular execution.
In the first step, the real-time electrical data at least comprises real-time grid-connected point voltage, the number of operating FC groups, a booster station main gear change position, active power output and reactive power output of an energy storage station, active power output and reactive power output of a fan group and each fan, a power generation plan curve, ultra-short-term predicted wind power within 0-4h, real-time reactive vacancy, reactive power reserve of a PCS (power control system) of the energy storage station, reactive power reserve of a rotor side converter of the fan group and each fan, reactive power reserve of a network side converter of the fan group and each fan, the number of the operating and non-operating FC groups and the operating and non-operating FC reactive reserve; the estimated related parameters at least comprise expected voltage shortage, expected reactive power shortage, expected wind power change value, expected voltage change value, reactive power reserve of the energy storage station in the next period, reactive power reserve of the fan group and the rotor side converter of each fan in the next period, and reactive power reserve of the fan group and the network side converter of each fan in the next period.
In the sixth step, before filling up the reactive power deficit, the method further comprises the step of judging whether the condition of preferentially quitting the FC in operation is met, and if so, the FC in operation is quitted first, and then the reactive power deficit is filled up according to the sequence of reactive power output of the equipment; if the reactive power is not satisfied, filling up the reactive power shortage according to the sequence of firstly carrying out reactive power output by the equipment and then quitting the FC in operation; the condition of preferentially exiting the FC in operation is that the FC is not exited from the lock, and the expected wind power change value shows that the active power output by the fan will be reduced.
In the sixth step, when the condition of preferentially quitting the running FC is met, the running FC is quitted in sequence according to the descending order of the running time length, when the reactive power shortage can be filled, the quitting is stopped, if the reactive power shortage cannot be filled, the reactive power output is carried out according to the sequence of the energy storage station PCS, the fan group rotor side converter and the fan group network side converter at first; when the condition of exiting the running FC preferentially is not met, reactive power output is performed by using reactive power storage according to the sequence of the energy storage station PCS, the fan group rotor side converter and the fan group network side converter, and if the reactive power shortage cannot be filled, the running FC is exited again.
In the seventh step, when the reactive power shortage is filled, the reactive power is stored to perform reactive power output according to the sequence of the energy storage station PCS at first, the fan group rotor side converter and the fan group network side converter at last; and if the reactive power shortage cannot be filled, the FC operation is continuously started.
In the seventh step, before the reactive power of the wind turbine grid-side converter is outputted, the method further includes a step of comparing the remaining reactive power shortage with the reactive power reserve of the wind turbine grid-side converter: if the reactive power reserve of the fan group network side converter is larger than the residual reactive power shortage, continuously judging whether the active power output of the fan in the next period of time can rise according to the expected change value of the wind power, and if so, putting in corresponding FC not smaller than the reactive power reserve of the fan group network side converter to replace and fill the reactive power shortage; and if the output power does not rise, performing reactive power output by the wind turbine grid-side converter.
In the seventh step, when the FC operation is continued, the method further includes a step of comparing whether the number of FCs to be used for filling up the reactive power shortage is the same or not when the wind turbine group grid-side converter performs or does not perform reactive power output, and if the number is the same, the wind turbine group grid-side converter stops reactive power output; otherwise, the output FC of the fan group network side converter cannot fill the reactive output of the full reactive power shortage part.
In the eighth step, whether the output of the active power of the energy storage station in the next time period is reduced is judged, and the output of the active power is compared with the output of the real-time active power of the energy storage station according to the absolute value of the difference between the scheduling value of the power generation planning curve in the next time period and the output predicted value of the fan group in the next time period; before performing reactive power output according to a preset first sequence, judging whether real-time reactive power reserve of the energy storage station is larger than that of a rotor-side converter of the double-fed fan, and if so, performing reactive power output according to the preset first sequence; otherwise, performing reactive power output according to a preset second sequence; the first sequence is the sequence of the energy storage station PCS at first, the fan group rotor side converter and the fan group network side converter at last, and the second sequence is the sequence of the fan rotor side converter at first, the energy storage station PCS and the fan network side converter at last.
The method comprises the following nine steps: comparing whether the next-period reactive power reserve of the fan rotor side converter is larger than the next-period reactive power reserve of the energy storage station PCS or not, and if so, performing reactive power output by using the reactive power reserve according to the sequence of the first fan group rotor side converter, the second energy storage station PCS and the last fan group network side converter; otherwise, according to the sequence of the energy storage station PCS at first, the fan group rotor side converter and the fan group network side converter at last, the reactive power is stored to perform reactive power output.
In the step ten, the reactive power is transferred from the energy storage station PCS to the abundant reactive power reserves on the rotor side of the fan, the reactive power of each fan is reserved according to the reactive power of the next time interval, and the fan with the larger reactive power reserve is distributed with the correspondingly larger reactive power.
The invention has the technical effects that the reactive power supply characteristics and the reserve margin of each reactive power device are fully exerted by comprehensively analyzing the real-time parameter acquisition and the ultra-short-term wind power prediction data. The most suitable reactive power equipment is given with the action sequence and the output quantity under different judgment scenes, and the grid-connected voltage is adjusted reasonably and efficiently. The active power change trend of a future 'three-station-in-one' wind power station is comprehensively considered, the condition that the voltage of a grid connection point crosses the line can be avoided to a certain extent, and the repeated adjustment of reactive power equipment can be effectively avoided.
Drawings
Fig. 1 is an overall control structure of the embodiment of the present invention.
FIG. 2 is a real-time fault determination control logic according to an embodiment of the present invention.
FIG. 3 is a control logic of Model 1 when the real-time fault is determined to exceed the upper limit of the real-time grid-connected point voltage command according to the embodiment of the present invention.
FIG. 4 is a control logic of Model 2 when the real-time fault is determined to exceed the lower limit of the real-time grid-connected point voltage command according to the embodiment of the present invention.
FIG. 5 is a control logic of Model 3 when the real-time fault is determined to expect the grid-connected point voltage to exceed the upper limit of the command according to the embodiment of the present invention.
FIG. 6 is a control logic of Model 4 when the real-time fault is determined to exceed the lower limit of the expected grid-connected point voltage.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The AVC control strategy method suitable for the three-station-in-one energy storage wind power station provided by the embodiment comprises the following steps:
the method comprises the steps of firstly, collecting real-time electrical data including real-time grid-connected point voltage, reactive power reserve and reactive power total reserve of each device of a power station, and estimating relevant parameters including a grid-connected point voltage expected value, energy storage station active power output and each fan predicted wind power in the next time period by combining ultra-short-term wind power prediction data. The real-time electrical data at least comprises real-time grid-connected point voltage, the number of FC groups in operation, a main gear change position of a booster station, active power output and reactive power output of an energy storage station, active power output and reactive power output of a fan group and each fan, a power generation plan curve, ultra-short-term predicted wind power within 0-4h, real-time reactive power shortage, reactive power reserve of a PCS (power control system) of the energy storage station, reactive power reserve of a rotor side converter of the fan group and each fan, reactive power reserve of a network side converter of the fan group and each fan, the number of FC groups in operation and not in operation and FC reactive reserve in operation and not in operation; the estimated related parameters at least comprise expected voltage shortage, expected reactive power shortage, expected wind power change value, expected voltage change value, reactive power reserve of the energy storage station in the next period, reactive power reserve of the fan group and the rotor side converter of each fan in the next period, and reactive power reserve of the fan group and the network side converter of each fan in the next period.
And step two, judging whether the real-time grid-connected point voltage is within a reference voltage instruction range, and if so, entering step three. Otherwise, entering the step four.
And step three, calculating the expected value of the voltage of the grid-connected point in the next time interval according to the ultra-short-term wind power prediction data, judging whether the expected value is in the reference voltage instruction range, if so, not adjusting, and returning to the step one. Otherwise, entering the step five.
And step four, judging whether the real-time grid-connected point voltage exceeds the upper limit of the reference voltage instruction or is lower than the lower limit of the reference voltage instruction, and entering step six if the real-time grid-connected point voltage exceeds the upper limit. Otherwise, entering step seven.
And step five, judging whether the expected value of the voltage of the grid-connected point exceeds the upper limit of the reference voltage instruction or is lower than the lower limit of the reference voltage instruction, and entering the step eight if the expected value of the voltage of the grid-connected point exceeds the upper limit of the reference voltage instruction. Otherwise, go to step nine.
And step six, judging whether the total reactive power reserve is smaller than the reactive power shortage, if so, performing a gear shifting action on the main transformer of the booster station, and returning to the step one. Otherwise, judging whether the condition of preferentially quitting the FC is met, if so, quitting the FC in operation first, and filling up the reactive power shortage by the sequence of the reactive power output of the equipment. If the reactive power is not met, the reactive power shortage is filled according to the sequence that the equipment firstly outputs the reactive power and then quits the FC in operation. The condition of preferentially exiting the FC in operation is that the FC is not exited from the lock, and the expected wind power change value shows that the active power output by the fan will be reduced. And when the condition of preferentially quitting the FC in operation is met, quitting the FC in operation according to the descending order of the operation time length, stopping quitting when the reactive power shortage can be filled, and if the reactive power shortage cannot be filled, performing reactive power output according to the order of the energy storage station PCS, the fan group rotor side converter and the fan group network side converter at first and the reactive power reserve. When the condition of exiting the FC in operation preferentially is not met, reactive power output is performed by using reactive power storage according to the sequence of the energy storage station PCS, the fan group rotor side converter and the fan group network side converter, and if the reactive power shortage cannot be filled, the operating FC is exited continuously. Then step ten is entered.
And step seven, judging whether the total reserve of the reactive power is smaller than the reactive power shortage, if so, performing a gear shifting action on the main transformer of the booster station, and returning to the step one. Otherwise, equipment with reactive power reserve is thrown to carry out reactive power output and FC operation is thrown to fill up the reactive power shortage. Then step ten is entered.
When the reactive power shortage is filled, reactive power is stored for reactive power output according to the sequence of the energy storage station PCS, the fan group rotor side converter and the fan group network side converter. And if the reactive power shortage cannot be filled, the FC operation is continuously started.
Simultaneously, before the reactive power output of the fan grid side converter, the method also comprises the step of comparing the residual reactive power shortage with the reactive power reserve of the fan grid side converter: and if the reactive power reserve of the fan group network side converter is larger than the residual reactive power shortage, continuously judging whether the active power output of the fan in the next period of time can rise according to the expected change value of the wind power, and if so, putting in corresponding FC not smaller than the reactive power reserve of the fan group network side converter to replace and fill the reactive power shortage. And if the output power does not rise, the reactive power output is carried out by the wind turbine group network side converter.
Before the reactive power output of the fan group network side converter, the method also comprises the step of comparing the residual reactive power shortage with the reactive power reserve of the fan group network side converter: and if the reactive power reserve of the fan group network side converter is larger than the residual reactive power shortage, continuously judging whether the active power output of the fan in the next period of time can rise according to the expected change value of the wind power, and if so, putting in corresponding FC not smaller than the reactive power reserve of the fan group network side converter to replace and fill the reactive power shortage. And if the output power does not rise, the reactive power output is carried out by the wind turbine group network side converter.
And continuing to put the FC into operation, and under the condition that the wind turbine group network side converter carries out or does not carry out reactive power output, putting the FC used for filling up the reactive power shortage into the wind turbine group network side converter to be the same in number, and if the FC is the same in number, stopping the reactive power output by the wind turbine group network side converter. Otherwise, the output FC of the fan group network side converter cannot fill the reactive output of the full reactive power shortage part.
And step eight, judging whether the active power output of the energy storage station in the next period is reduced, filling the reactive power deficit by sequentially outputting reactive power by all the equipment according to a preset first sequence when the active power output of the energy storage station in the next period is reduced, and filling the reactive power deficit by sequentially outputting reactive power by all the equipment according to a preset second sequence when the active power output of the energy storage station in the next period is reduced. Then step ten is entered.
And judging whether the output of the active power of the energy storage station in the next period is reduced or not, wherein the judgment is obtained by comparing the output of the active power of the energy storage station in real time with the output of the active power of the energy storage station according to the absolute value of the difference between the dispatching value of the power generation planning curve in the next period and the output predicted value of the fan group in the next period. Before reactive power output is carried out according to a preset first sequence, whether the real-time reactive power reserve of the energy storage station is larger than the reactive power reserve of the rotor-side converter of the double-fed fan or not is judged, and if the real-time reactive power reserve of the energy storage station is larger than the reactive power reserve of the rotor-side converter of the double-fed fan, reactive power output is carried out according to the preset first sequence. Otherwise, performing reactive power output according to a preset second sequence. The first sequence is the sequence of the energy storage station PCS at first, the fan group rotor side converter and the fan group network side converter at last, and the second sequence is the sequence of the fan rotor side converter at first, the energy storage station PCS and the fan network side converter at last.
And step nine, comparing the reactive power reserves of different equipment in the power station in the next period, and sequentially performing reactive power output in the previous sequence of the equipment with the larger reactive power reserves in the next period to fill up the reactive power shortage. Then step ten is entered. Specifically, whether the reactive power reserve of the fan rotor side converter in the next period is larger than that of the energy storage station PCS is compared, and if yes, reactive power is stored according to the sequence of the fan rotor side converter, the energy storage station PCS and the fan grid side converter firstly to achieve reactive power output. Otherwise, according to the sequence of the energy storage station PCS at first, the fan group rotor side converter and the fan group network side converter at last, the reactive power is stored to perform reactive power output.
And step ten, on the premise of ensuring that the reactive power shortage is filled, transferring the reactive power output to each fan of the power station, distributing the reactive power output of each fan by combining the predicted wind power of each fan in the next period and real-time reactive power storage, and finally returning to the step one for circular execution. The reactive power is transferred from the energy storage station PCS to the abundant reactive power reserves at the rotor side of the fan, the reactive power of each fan is reserved according to the reactive power of the next time period, and the fan with the larger reactive power reserve distributes the correspondingly larger reactive power.
Example 2
In this embodiment, AVC control on an energy storage wind power station is implemented by dividing a parameter setting layer, a real-time fault judgment layer, an equipment action layer, and a steady state optimization layer, where:
a parameter setting layer: the method comprises the steps of collecting and calculating real-time electric quantity of a three-station-in-one wind power station through each collecting and monitoring module of the three-station-in-one wind power station, and estimating key parameters such as expected grid-connected point voltage, expected reactive power reserve of each device and the like in the next time period (after 15 minutes) by combining ultra-short-term wind power prediction data for use.
Judging fault in real time: and judging the state of the grid-connected point voltage by a fault in real time based on the related data acquired and calculated by the parameter setting layer, wherein the judgment is mainly divided into 2-layer judgment.
1) The first layer is used for judging whether the real-time grid-connected point voltage meets a reference voltage instruction range issued by a superior control center, and if the real-time grid-connected point voltage does not meet the requirement of distinguishing whether the real-time grid-connected point voltage exceeds a reference voltage instruction upper limit or a reference voltage instruction lower limit, the judgment result is divided into a real-time voltage over-instruction upper limit Model 1 and a real-time voltage over-instruction lower limit Model 2. The layer determines that the real-time condition of the grid-connected point voltage is analyzed and measures need to be taken to quickly enable the grid-connected point voltage to meet a reference voltage instruction.
2) And if the first layer is judged to be qualified, entering the second layer for judgment, calculating the expected change value of the grid-connected point voltage in the next time period (after 15 minutes) according to the ultra-short-term wind power prediction data, judging whether the expected value of the grid-connected point voltage in the next time period meets the reference voltage instruction range issued by the superior control center, if so, no equipment acts, and re-entering for real-time fault judgment. If the need for distinguishing whether the reference voltage command upper limit or the reference voltage command lower limit is exceeded is not satisfied, the determination result is divided into a desired voltage over-command upper limit Model 3 and a desired voltage over-command lower limit Model 4. The layer determines the situation of analyzing the next time interval of the grid-connected point voltage, and can take active measures in advance to avoid the situation from being inconsistent with the reference voltage instruction or properly slow down the line crossing degree.
A device action layer: according to the result of gradually judging faults in real time, different grid-connected point voltages U are dealt with PCC And entering different reactive power equipment regulating logics in the state.
1) And when the real-time grid-connected point voltage exceeds the upper limit of the command, entering a Model 1 control strategy, and acquiring related parameters from a parameter setting layer. Then judging the energy storage station PCS reactive power reserve Q BESS Reactive power reserve Q of rotor-side converter of doubly-fed fan DFIG-R Reactive power reserve Q of grid-side converter of double-fed fan DFIG-G And can input reactive power of FC and the likeRate reserve Q FC-all Whether the sum of the multiple is greater than the reactive power shortage Q ref . When the sum is less than the reactive power shortage Q ref And then, the main transformer of the booster station performs a gear shifting action and enters the real-time fault judgment again.
When the sum of the reactive powers which can be thrown is larger than the reactive power shortage, whether the condition of preferentially exiting the running FC is met or not is considered: and the locked FC group is not withdrawn, and the active power output by the fan is in a significant descending trend within 2h in the future through ultra-short-term wind power prediction. When the FC group preferential exit condition is met, the action sequence of the reactive equipment is that the energy storage station PCS, the double-fed fan rotor side converter and the double-fed fan power grid side converter are arranged until the reactive power shortage Q is met ref . When the FC priority exit condition is not met, the action sequence of the reactive power equipment is that the energy storage station PCS, the double-fed fan rotor side converter, the double-fed fan power grid side converter and the FC exit in operation till the reactive power shortage Q is met ref 。
2) And when the real-time grid-connected point voltage crossing command lower limit is obtained through judgment, entering a Model 2 control strategy, and firstly obtaining relevant parameters from a parameter setting layer. Then judging the energy storage station PCS reactive power reserve Q BESS Reactive power reserve Q of rotor-side converter of doubly-fed fan DFIG-R Reactive power reserve Q of grid-side converter of double-fed fan DFIG-G And can put into reactive power reserve Q such as FC FC-all Whether the sum of the four is greater than the reactive power shortage Q ref . When the sum of the four is less than the reactive power shortage Q ref And then, the main transformer of the booster station performs a gear shifting action and enters the real-time fault judgment again.
When the sum of the four is larger than the reactive power shortage, whether the reactive power reserve of the energy storage station PCS meets the reactive power shortage Q or not is considered preferentially ref When the reactive power reserve of the PCS still does not satisfy the reactive power shortage, the reactive power reserves of the rotor-side converter and the grid-side converter of the doubly-fed wind turbine are continuously taken into consideration in turn. And when the reactive power reserve of the rotor-side converter is not satisfied and the reactive power reserve of the grid-side converter is satisfied, judging whether a group of FC (fiber channel) needs to be put into in advance by combining the ultra-short-term wind power of the next node. Only when both are idleWhen the reserves can not satisfy the reactive power shortage, the sequential investment of the investable FC groups is continuously considered to satisfy the reactive power shortage Q ref 。
3) And when the expected grid-connected point voltage exceeds the upper limit of the command, entering a Model 3 control strategy, and firstly judging whether the active power output of the energy storage station is reduced progressively and the real-time reactive power reserve of the energy storage station is larger than the reactive power reserve of the rotor-side converter of the double-fed fan in the next time period. When the two are both established, the action sequence of the reactive equipment is the energy storage station PCS, the double-fed fan rotor side converter and the grid side converter in sequence. Otherwise, the action sequence of the reactive power source is the rotor side converter of the double-fed fan, the energy storage station PCS and the grid side converter of the double-fed fan, and the process does not require that the sum of the reactive power of the rotor side converter, the energy storage station PCS and the grid side converter of the double-fed fan must meet the expected reactive power shortage.
4) And when the expected grid-connected point voltage is judged to exceed the lower limit of the command, entering a Model 4 control strategy, and firstly comparing whether the reactive power reserve of the rotor-side converter of the doubly-fed fan at the next time period is larger than that of the energy storage station PCS. When the reactive power reserve of the rotor-side converter of the double-fed fan is larger than that of the energy storage station PCS, the action sequence of the reactive power source is the reactive power reserve of the rotor-side converter of the double-fed fan, the energy storage station PCS and the grid-side converter of the double-fed fan in sequence, otherwise, the action sequence of the reactive power source is the energy storage station PCS, the rotor-side converter of the double-fed fan and the grid-side converter, and the process does not require the sum of the reactive power of the energy storage station PCS, the rotor-side converter of the double-fed fan and the grid-side converter to meet the expected reactive power shortage.
Steady state optimization layer:
when the equipment action layer finishes regulation, the voltage of the grid-connected point is regulated within the reactive power source capability range and accords with a grid-connected point reference voltage instruction issued by a superior control center. At the moment, the reactive power output of each reactive power source is optimized, and the method is mainly divided into two parts:
1) And when the real-time voltage is judged to be adjusted in an off-line mode, the reactive power output of the energy storage PCS is gradually replaced by the abundant reactive power reserve at the rotor side of the double-fed fan, and the capacity of the energy storage PCS is released.
2) And (3) combining the next-period ultra-short-term wind power prediction data of each single fan, and performing optimal distribution of the reactive power output requirements of the fan group by real-time reactive power reserves of each single fan, so as to reduce the loss of a current collection line and not influence the active power output of each single fan.
Fig. 1 is an overall control structure provided in this embodiment, which includes a parameter setting layer, a real-time fault determination layer, an equipment action layer, and a steady-state optimization layer.
The parameter setting layer is mainly used for collecting and reading data of each device and node through each monitoring system and SCADA system of the 'three-station-in-one' wind power station (for example, real-time grid-connected point voltage U PCC The number of FC groups put into operation, the main gear change of the booster station and the active power output P of the energy storage station n-BESS And reactive power output Q n-BESS Active power output P of each fan and fan group n-Wind And reactive power output Q n-Wind Scheduling and issuing day-ahead power generation plan curve P plan And ultra-short-term wind power prediction power P within 0-4h pre ) And calculating real-time data required by the corresponding control strategy according to the real-time data (such as: real-time voltage shortage delta U PCC Real-time reactive power shortage Q ref Reactive power reserve Q of energy storage station PCS BESS Fan group and rotor side converter Q of each fan DFIG-R And reactive power reserve Q of the grid-side converter DFIG-G Main transformer on-load tap changer gear margin, FC group number in operation and not in operation, and FC reactive reserve Q in operation/not in operation FC-all ) And corresponding parameter calculation and setting are carried out by combining the ultra-short term wind power prediction data of the wind turbine group (such as: desired voltage deficit Δ U PCC-pre Desired reactive power deficit Q ref-pre Expected wind power change value delta P and expected voltage change value U PCC-pre And the next period of reactive power reserve Q of the energy storage station BESS-pre Fan group and rotor side converter Q of each fan in next time period DFIG-Rpre And reactive reserve Q of network-side converter DFIG-Gpre ) And parameter values are provided for each link of the control strategy.
Referring to fig. 2, the real-time fault diagnosis will be described in detail with reference to fig. 2. And judging the state of the grid-connected point voltage by a real-time fault on the basis of the related data acquired and calculated by the parameter setting layer, wherein the judgment is mainly divided into 2 layers of judgment, namely real-time voltage line crossing judgment and expected voltage line crossing judgment. The method mainly comprises the following steps:
1) Real-time reading grid-connected point voltage U of three-station-in-one wind power station PCC And a reference voltage instruction range U given by a superior control center order [U ordermin , U ordermax ]。
2) By comparing the voltage U of the grid-connected point PCC And a reference voltage command range U order [U ordermin , U ordermax ]And comparing and judging the voltages of the grid-connected points in real time. Aiming at judging whether the voltage of a real-time grid-connected point accords with a reference voltage instruction or not, if the voltage does not accord with the reference voltage instruction, the upper limit of the instruction is exceeded, namely the upper limit of the Model 1 (U) is exceeded PCC > U ordermax ) The lower limit Model 2 (U) is further exceeded PCC < U ordermin ) And entering the device operation control corresponding to the determination result.
3) If the real-time grid-connected point voltage meets the reference voltage instruction requirement (U) ordermin < U PCC < U ordermax ) And calculating the expected change value delta P of the wind power in the next period and the expected change value delta U of the voltage of the grid-connected point by combining the next predicted point data (after 15 minutes) of the ultra-short-term wind power prediction of the wind power plant PCC-pre 。
4) By comparing the grid-connected point voltage expected value (U) PCC +U PCC-pre ) And reference voltage command range [ U ordermin , U ordermax ]And comparing and judging the expected grid-connected point voltage. Aiming at judging whether the expected grid-connected point voltage in the next time interval accords with the reference voltage instruction or not, if not, the judgment is to cross the instruction upper limit Model 3 (U) PCC +U PCC-pre > U ordermax ) The lower limit Model 4 (U) is further exceeded PCC +U PCC-pre < U ordermin ) And entering a device operation step corresponding to the determination result.
Fig. 3 to 6 sequentially show the control logics of the four determination results (Model 1, model 2, model 3, and Model 4) corresponding to the real-time fault determination at the device operation level, respectively. The four control logics of the device action layer are further explained in the following with the attached drawings.
FIG. 3 shows the control logic of the device action layer corresponding to the real-time voltage over-limit Model 1. Firstly, obtaining reactive power shortage Q according to parameter setting layer ref And can provide reactive power reserve value of reactive power equipment (energy storage PCS reactive power reserve Q BESS Double-fed fan rotor side converter reactive power reserve Q DFIG-R Reactive power reserve Q of grid-side converter of double-fed fan DFIG-G And FC reactive power reserve Q FC-all ). Determining whether the sum of the reactive power reserves of all devices satisfies the reactive power deficit Q ref And if the step-up station main transformer is not satisfied with the step-up action, changing the reactive power flow in the station and re-entering the real-time fault judgment.
And if so, continuously judging whether the FC priority exit condition in operation is met, wherein the priority exit condition is that the locked FC group is not exited and the active power output by the fan is in an obvious descending trend within 2h in the future by ultra-short-term wind power prediction. If so, determining all reactive power Q provided at the commissioning FC FC-all Whether or not to satisfy reactive power shortage Q ref And if the reactive power shortage is not met, gradually quitting all the running FC, continuously considering the reactive power reserves of the energy storage station PCS, the doubly-fed fan group rotor side converter and the grid side converter, and performing reactive power output of the next device only when the reactive power reserves of the current device do not meet the reactive power shortage. If all the reactive power Q provided at the commissioning FC FC-all Satisfy reactive power shortage Q ref If so, sequentially exiting the FC according to the descending order of the operation time of the FC until the reactive power shortage Q is met ref 。
When the FC priority exit condition is not met, the reactive power reserves of the energy storage station PCS, the doubly-fed fan group rotor side converter and the grid side converter and the reactive power reserve of the FC in operation are considered in sequence. And the reactive power output of the next equipment is carried out only when the reactive power reserve of the current equipment still does not meet the reactive power shortage after the reactive power reserve of the current equipment outputs power.
FIG. 4 shows the control logic of the device action layer corresponding to the real-time voltage over-limit Model 2. First according to the parametersSetting layer to obtain reactive power shortage Q ref And can provide reactive power reserve value of reactive power equipment (energy storage PCS reactive power reserve Q BESS Reactive power reserve Q of rotor-side converter of doubly-fed fan DFIG-R Reactive power reserve Q of grid-side converter of double-fed fan DFIG-G And FC reactive power reserve Q FC-all ). Determining whether the sum of the reactive power reserves of all devices satisfies the reactive power deficit Q ref And if the step-up station main transformer is not satisfied with the step-up action, changing the reactive power flow in the station and re-entering the real-time fault judgment.
If yes, then comparing the reactive power reserve Q of the energy storage station PCS BESS Whether or not to satisfy reactive power shortage Q ref If the requirement is met, the energy storage station PCS outputs corresponding reactive power shortage, otherwise, all reactive power reserves Q are output BESS And further considering reactive power reserve Q of rotor side conversion of the doubly-fed wind turbine group DFIG-R . When reactive power reserves of the energy storage station PCS and the double-fed fan group rotor side converter cannot meet reactive power shortage, further considering reactive power reserve Q of the double-fed fan group network side converter DFIG-G Whether or not to satisfy the remaining reactive deficit (Q) ref -Q BESS -Q DFIG-R ）。
And if the wind power output of the fan is in the expected judgment, judging whether the active power output of the fan in the next time period is in an ascending trend or not according to the super-short-term wind power prediction data in the next time period. If so, the wind turbine grid-side converter does not output, and the FC group which is just larger than the reactive power reserve of the double-fed wind turbine grid-side converter is put into operation, otherwise, the double-fed wind turbine grid-side converter outputs Q ref -Q BESS -Q DFIG-R If no FC group can be put into, the secondary step is not considered.
If not, the reactive power shortage Q is met under the condition that whether the reactive power reserve of the wind turbine group network side converter is output or not ref And whether the number of FC groups put in is the same. Gradually adding FC groups to respectively satisfy the residual reactive power shortage (Q) ref -Q BESS -Q DFIG-R ) And (Q) ref -Q BESS -Q DFIG-R -Q DFIG-G ) Judging whether the number of the needed FC groups is the same or not, if so, outputting no reactive power by the wind turbine group network side converter, and if not, outputting Q by the wind turbine group network side converter ref -Q BESS -Q DFIG-R -X 1 *Q FC The reactive power of (c).
FIG. 5 shows the control logic of the device action layer corresponding to the expected voltage over-limit Model 3. Firstly, whether the active power output of the energy storage station is decreased progressively and whether the real-time reactive power reserve of the energy storage station is larger than the reactive power reserve of a rotor-side converter of the double-fed fan in the next time period is judged. Whether the active power output of the energy storage station in the next period is decreased is represented by the comparison condition between the absolute value of the difference between the scheduling value of the power generation planning curve in the next time and the output predicted value of the wind turbine group in the next time and the real-time active power output of the energy storage station. When the real-time active power output of the energy storage station is small, the active power output of the energy storage station in the next period is increased gradually, and otherwise, the active power output of the energy storage station is decreased gradually.
Only when both are true, the order of the reactive power source is the energy storage station PCS, the doubly-fed wind turbine rotor-side converter and the grid-side converter. Otherwise, the action sequence of the reactive power source is a double-fed fan rotor side converter, an energy storage station PCS and a double-fed fan grid side converter. The process does not require that the sum of the three reactive powers must meet the expected reactive power deficit and that the reactive power of the next device is output only if the reactive power reserve of the current device does not meet the reactive power deficit.
FIG. 6 shows the control logic of the device action layer corresponding to the lower limit Model 4 of the expected voltage. First according to the expected voltage shortage DeltaU PCC-pre Calculating the expected reactive power deficit Q ref-pre And then judging whether the expected reactive power reserve of the rotor-side converter of the doubly-fed wind turbine is larger than that of the energy storage station PCS or not. When the expected reactive power reserve of the rotor-side converter of the double-fed fan is larger than that of the energy storage station PCS, the action sequence of the reactive power source is that of the rotor-side converter of the double-fed fan, the energy storage station PCS and the grid-side converter of the double-fed fan. Otherwise, the action sequence of the reactive power source is the energy storage station PCS, the double-fed fan rotor side converter and the double-fed fanA grid-side converter. The process does not require that the sum of the reactive power of the three equipment must meet the expected reactive deficit and that the reactive power of the next equipment is only performed when the reactive power of the current equipment still does not meet the reactive deficit after the reactive power of the current equipment is uniformly stored.
The steady state optimization layer is used for optimizing the reactive power output of each reactive power source within the reactive power reserve capacity range of the reactive power source when the equipment action layer finishes adjustment according to the judgment result of the real-time fault judgment layer and does not need to adjust through the real-time fault judgment layer, and the steady state optimization layer is mainly divided into two parts:
1) And the reactive power output of the energy storage station PCS is gradually replaced by abundant reactive power reserves at the rotor side of the double-fed fan, and the capacity of the energy storage station PCS is released.
2) The reactive power output of each fan is optimally distributed by combining the next-period ultra-short-term wind power prediction data of each fan and the real-time reactive power reserve of each fan, so that the loss of a current collection circuit is reduced, the active power output of each fan is not influenced to the greatest extent, and the reactive power redistribution in the fan group is realized.

Claims (10)

1. An AVC control strategy method suitable for a three-station-in-one energy storage wind power station is characterized by comprising the following steps:
acquiring real-time electrical data of a power station including real-time grid-connected point voltage, reactive power reserve and total reactive power reserve of each device, and estimating related parameters including grid-connected point voltage expected value, energy storage station active power output and each fan predicted wind power in the next period by combining ultra-short-term wind power prediction data;
step two, judging whether the voltage of the real-time grid-connected point is within a reference voltage instruction range, and if so, entering step three; otherwise, entering the step four;
step three, calculating a voltage expected value of a grid-connected point in the next time period according to the ultra-short term wind power prediction data, judging whether the voltage expected value is within a reference voltage instruction range, if so, not adjusting, and returning to the step one; otherwise, entering the step five;
step four, judging whether the real-time grid-connected point voltage exceeds the upper limit of a reference voltage instruction or is lower than the lower limit of the reference voltage instruction, and entering step six if the real-time grid-connected point voltage exceeds the upper limit; otherwise, entering a step seven;
step five, judging whether the grid-connected point voltage expected value exceeds the upper limit of a reference voltage instruction or is lower than the lower limit of the reference voltage instruction, and entering the step eight if the grid-connected point voltage expected value exceeds the upper limit; otherwise, entering the step nine;
step six, judging whether the total reactive power reserve is smaller than the reactive power shortage, if so, performing a gear shifting action on a main transformer of the booster station, and returning to the step one; otherwise, equipment with reactive power reserve is put into the system to carry out reactive power output and FC in the running quit is used for filling reactive power shortage; then entering the step ten;
step seven, judging whether the total reserve of the reactive power is smaller than the reactive power shortage, if so, performing a gear shifting action on a main transformer of the booster station, and returning to the step one; otherwise, equipment with reactive power reserve is thrown to carry out reactive power output and FC operation to fill up reactive power shortage; then entering step ten;
step eight, judging whether the output of the active power of the energy storage station in the next period is reduced, if so, filling the reactive power shortage by sequentially reactive power output of each device according to a preset first sequence, otherwise, filling the reactive power shortage by sequentially reactive power output of each device according to a preset second sequence; then entering step ten; the first sequence is the sequence of the energy storage station PCS at first, the fan group rotor side converter and the fan group network side converter at last, and the second sequence is the sequence of the fan rotor side converter at first, the energy storage station PCS and the fan network side converter at last;
step nine, comparing reactive power reserves of different equipment in the power station in the next period, and sequentially performing reactive power output in the previous sequence of the equipment with larger reactive power reserves in the next period to fill up reactive power shortage; then entering the step ten;
and step ten, on the premise of ensuring that the reactive power shortage is filled, transferring the reactive power output to each fan of the power station, distributing the reactive power output of each fan by combining the predicted wind power of each fan in the next period and real-time reactive power storage, and finally returning to the step one for circular execution.
2. The method according to claim 1, wherein in the first step, the real-time electrical data at least comprises real-time grid-connected point voltage, the number of FC groups in operation, a main gear change of a booster station, active power output and reactive power output of an energy storage station, active power output and reactive power output of a fan group and each fan, a power generation plan curve, ultra-short-term predicted wind power within 0-4h, real-time reactive vacancy, reactive power reserve of a PCS of the energy storage station, reactive power reserve of a rotor-side converter of the fan group and each fan, reactive power reserve of a network-side converter of the fan group and each fan, the number of FC groups in operation and not in operation and FC reactive reserve in operation and not in operation; the estimated related parameters at least comprise expected voltage shortage, expected reactive power shortage, expected wind power change value, expected voltage change value, reactive power reserve of the energy storage station in the next period, reactive power reserve of the fan group and the rotor side converter of each fan in the next period, and reactive power reserve of the fan group and the network side converter of each fan in the next period.
3. The method of claim 2, wherein in step six, before filling the reactive power deficit, the method further comprises the step of determining whether a condition for preemptively exiting the FC in operation is satisfied, and if so, filling the reactive power deficit in the order of exiting the FC in operation and then filling the reactive power deficit with the reactive power of the equipment; if the reactive power is not satisfied, filling up the reactive power shortage according to the sequence of firstly carrying out reactive power output by the equipment and then quitting the FC in operation; the condition of preferentially exiting the FC in operation is that the FC is not exited from the lock, and the expected wind power change value shows that the active power output by the fan will be reduced.
4. The method according to claim 3, wherein in the sixth step, when the condition of preferentially exiting the operating FC is met, the operating FC is sequentially exited according to the descending order of the operation duration, the exiting is stopped when the reactive power shortage can be filled, and if the reactive power shortage cannot be filled, the reactive power output is performed by using the reactive power reserve according to the order of the energy storage station PCS, the fan group rotor side converter and the fan group network side converter; when the condition of exiting the FC in operation preferentially is not met, reactive power output is performed by using reactive power storage according to the sequence of the energy storage station PCS, the fan group rotor side converter and the fan group network side converter, and if the reactive power shortage cannot be filled, the operating FC is exited continuously.
5. The method according to claim 2, wherein in the seventh step, when the reactive power shortage is filled, the reactive power output is performed by using reactive power reserve according to the sequence of the energy storage station PCS firstly, the fan group rotor side converter secondly and the fan group network side converter thirdly; and if the reactive power shortage cannot be filled, the FC operation is continuously started.
6. The method of claim 5, wherein the seventh step, before the wind turbine grid-side converter reactive power outtake, further comprises the step of comparing the remaining reactive power deficit with a wind turbine grid-side converter reactive power reserve: if the reactive power reserve of the fan group network side converter is larger than the residual reactive power shortage, continuously judging whether the active power output of the fan in the next period of time can rise according to the expected change value of the wind power, and if so, inputting a corresponding FC not smaller than the reactive power reserve of the fan group network side converter to replace and fill the reactive power shortage; and if the output power does not rise, the reactive power output is carried out by the wind turbine group network side converter.
7. The method according to claim 5, wherein in the seventh step, when continuing to put into operation the wind turbine grid-side converter further comprises the step of comparing whether the number of FC put into use for filling reactive power deficit is the same under the condition that the wind turbine grid-side converter performs reactive power output or does not perform reactive power output, and if the number is the same, the wind turbine grid-side converter stops reactive power output; otherwise, the output FC of the fan group network side converter cannot fill the reactive output of the reactive power shortage part.
8. The method according to claim 2, wherein in the eighth step, the judgment on whether the active power output of the energy storage station decreases in the next time period is obtained by comparing the absolute value of the difference between the scheduling value of the power generation planning curve in the next time period and the predicted output value of the wind turbine group in the next time period with the magnitude of the real-time active power output of the energy storage station; before performing reactive power output according to a preset first sequence, judging whether real-time reactive power reserve of the energy storage station is larger than that of a rotor-side converter of the double-fed fan, and if so, performing reactive power output according to the preset first sequence; otherwise, performing reactive power output according to a preset second sequence.
9. The method of claim 2, wherein said step nine comprises: comparing whether the next-period reactive power reserve of the fan rotor side converter is larger than the next-period reactive power reserve of the energy storage station PCS or not, and if so, performing reactive power output by using the reactive power reserve according to the sequence of the first fan group rotor side converter, the second energy storage station PCS and the last fan group network side converter; otherwise, according to the sequence of the energy storage station PCS at first, the fan group rotor side converter and the fan group network side converter at last, the reactive power is stored to perform reactive power output.
10. The method of claim 2, wherein in step ten, the reactive power is transferred from the power station PCS to the spare reactive power reserve on the rotor side of the wind turbine, the reactive power of each wind turbine is reserved according to the next time interval, and the wind turbine with the larger reactive power reserve is allocated the correspondingly larger reactive power.
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