CN105552924A - AVC (Automatic Voltage Control) method for wind power plant - Google Patents

AVC (Automatic Voltage Control) method for wind power plant Download PDF

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Publication number
CN105552924A
CN105552924A CN201510976754.5A CN201510976754A CN105552924A CN 105552924 A CN105552924 A CN 105552924A CN 201510976754 A CN201510976754 A CN 201510976754A CN 105552924 A CN105552924 A CN 105552924A
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China
Prior art keywords
idle
main transformer
blower fan
increment
correction target
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CN201510976754.5A
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CN105552924B (en
Inventor
任巍曦
刘宏勇
张雁忠
牛虎
赵洲
寇建
徐晓川
赵博超
王荔
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STATE GRID XINYUAN ZHANGJIAKOU SCENERY STORAGE DEMONSTRATION POWER PLANT CO Ltd
State Grid Corp of China SGCC
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STATE GRID XINYUAN ZHANGJIAKOU SCENERY STORAGE DEMONSTRATION POWER PLANT CO Ltd
State Grid Corp of China SGCC
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Priority to CN201510976754.5A priority Critical patent/CN105552924B/en
Publication of CN105552924A publication Critical patent/CN105552924A/en
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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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • 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
    • H02J3/386—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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

Abstract

The invention discloses an AVC (Automatic Voltage Control) method for a wind power plant. A reactive distribution method for the wind power plant can be given according to a deviation between a target value of a voltage of a grid-connection point of the wind power plant and an actually measured value of a bus voltage of the grid-connection point. According to the method, quick and irregular change of the voltage can be stabilized by fully utilizing the quickness of adjustment of a dynamic reactive power compensation apparatus; while running requirements of a reactive voltage are met, quick adjustment capability of an SVG is reserved as far as possible, and dynamic reactive power reserves are provided for emergent situations such as power grid events and the like; based on a distributed balance characteristic of the reactive voltage, a control unit is modeled according to a fan line; and slow change of the voltage is compensated through coordination and cooperation of multiple reactive sources, so that the voltage of the grid-connection point is maintained to meet the requirements.

Description

The control method of a kind of wind energy turbine set AVC
(1) technical field:
The present invention relates to control technique in power system technical field, particularly relate to a kind of wind energy turbine set AVC (AutomaticVoltageControl---automatism voltage control) control method.
(2) background technology:
In recent years along with the continuous intensification that growing tension and the people of fossil energy supply pay close attention to global environmental problems such as climate changes, promote that energy sustainable development becomes the common recognition of countries in the world by Renewable Energy Development, wind power generation obtains and develops fast.Along with the continuous increase of wind energy turbine set installed capacity, the safe and stable operation situation of grid-connected wind farms and access area power grid thereof receives publicity day by day, and one of them importance is exactly that the grid-connected meeting of large-scale wind power causes voltage ripple of power network.
Newly-built wind energy turbine set is all configured with dynamic reactive compensation device, as SVC, SVG etc., to improve the dynamic responding speed that reactive power regulates.The dynamic reactive compensation device of wind energy turbine set configuration suitable capacity, and carry out control and management according to system requirements, effectively can improve the stability of wind energy turbine set output voltage.
The people such as Nanjing Sino-German Protection Control System Co., Ltd. Liu Shuan, Zhang Jianzhou propose the coordination control strategy of wind energy turbine set inner blower and reactive power compensator; take preferential regulating wind power unit idle; secondly regulate the principle that reactive power compensator is idle, maintain the stable of wind farm grid-connected point voltage.But this strategy fails to give full play to the rapid adjustability of dynamic reactive compensation device to stabilize the change of voltage quick irregular, easily causes voltage-regulation defective.
(3) summary of the invention:
Order of the present invention is the control method providing a kind of wind energy turbine set AVC, it can overcome above-mentioned the deficiencies in the prior art, by cooperation control multi-source reactive apparatus, make full use of the rapidity that dynamic reactive compensation device regulates, stabilize the change of voltage quick irregular, meeting reactive voltage service requirement simultaneously, retain the rapid adjustability of SVG as far as possible, can be the emergencies such as power grid accident provides dynamic reactive for subsequent use.
Technical scheme of the present invention: the control method of a kind of wind energy turbine set AVC, is characterized in that it comprises the following steps:
(1) the wind farm grid-connected point voltage desired value U that dispatching patcher issues is obtained target, obtain wind farm grid-connected some busbar voltage measured value U meaand the real-time status data of blower fan and reactive power compensator, operation information and booster stations electric quantity information;
(2) according to formula Δ U=|U target-U mea| calculate wind farm grid-connected point voltage deviate Δ U; If voltage deviation value Δ U is in the voltage deviation dead band threshold value preset, then enter step 3); Otherwise enter step (4);
(3) carry out idle displacement, return step (1);
(4) in conjunction with the idle sensitivity of wind farm grid-connected point voltage, idle increment Delta Q is calculated;
(5) idle increment is carried out between each main transformer just sub-distribution;
(6) according to separate unit main transformer with blower fan and the idle controlled nargin of reactive-load compensation equipment, calculate the idle controlled nargin of separate unit main transformer;
(7) calculate the idle correction target value of each main transformer in conjunction with the idle controlled nargin of separate unit main transformer and the result of first sub-distribution, and it is carried out sub-distribution again between each main transformer;
(8) by the idle increment Delta Q ＇ again distributing to separate unit main transformer respectively each main transformer with blower fan and reactive power compensator between distribute;
(9) generate idle control objectives according to the idle increment allocation result of step (8), send idle control command according to idle control objectives to blower fan and reactive power compensator.
(10) turn to step (1), enter next computing cycle.
In described step (2), voltage deviation dead band threshold value should be the wind farm grid-connected point voltage undulate quantity of permission.
The concrete grammar carrying out idle displacement in described step (3) is made up of following steps:
(3-1) setting idle displacement increment is based on experience value Δ Q z, generally can get 0.5MVar ~ 1.5MVar;
(3-2) the idle output total amount Q of dynamic reactive compensation device under each main transformer is calculated respectively s, and the idle output total amount Q of blower fan f;
(3-3) at every turn newly-generated Q is judged fwith the Q that last time generates fwhether in the deviation range of setting, if in the deviation range of setting, directly return step (1), if not in the deviation range of setting, enter step (3-4);
(3-4) Q is judged ssymbol;
If Q s>0, then the idle increment distributed to dynamic reactive compensation device is-Δ Q z, the total idle increment that fan distributes is+Δ Q z, and carry out idle output, return step (1);
If Q s<0, then the idle increment distributed to dynamic reactive compensation device is+Δ Q z, the total idle increment that fan distributes is-Δ Q z, and carry out idle output, return step (1);
In described step (5), the method for idle increment being carried out just sub-distribution is between each main transformer, distribute idle increment according to the meritorious ratio of exerting oneself of each main transformer.
Described step (7) calculates the idle correction target value of each main transformer in conjunction with the idle controlled nargin of separate unit main transformer and the result of first sub-distribution, and the method for it being carried out between each main transformer sub-distribution is again made up of following steps:
(7-1) the idle controlled nargin of the idle increment and separate unit main transformer of distributing to separate unit main transformer is compared;
If the idle increment (7-2) distributing to separate unit main transformer is less than or equal to the idle controlled nargin of separate unit main transformer, then the idle correction target value of separate unit main transformer is the idle increment distributing to separate unit main transformer;
If the idle increment (7-3) distributing to separate unit main transformer is greater than the idle controlled nargin of separate unit main transformer, then the idle correction target value of separate unit main transformer is the idle controlled nargin of separate unit main transformer;
(7-4) by the idle correction target value summation of each main transformer, total idle correction target value Δ Q is generated 1, according to formula Δ Q ε=| Δ Q-Δ Q 1| calculate total idle correction target value Δ Q 1and the deviate Δ Q between total idle increment Delta Q ε;
If Δ Q εin the idle deviation dead band threshold value preset, then the idle correction target value of each the main transformer obtained is distributed to each main transformer;
If Δ Q εnot in the idle deviation dead band threshold value preset, then by Δ Q εthe meritorious ratio of exerting oneself in each main transformer between the separate unit main transformer still having idle controlled nargin is distributed, and again generates the idle correction target value sum Δ Q of each main transformer 1, and calculate Δ Q ε, until Δ Q εenter in the idle deviation dead band threshold value that presets, finally obtain the idle correction target value of each main transformer and distribute to each main transformer.
The idle deviation dead band threshold value that described step (7-4) presets sets based on experience value, generally can get 0.3MVar ~ 0.6MVar.
In described step (8) by the idle increment Delta Q ＇ again distributing to separate unit main transformer respectively each main transformer with blower fan and reactive power compensator between the concrete grammar that carries out distributing comprise the following steps:
(8-1) first the idle increment again distributing to separate unit main transformer is distributed to dynamic reactive compensation device, if idle increment is greater than the controlled nargin of dynamic reactive compensation device, then will has more part and distribute to blower fan;
(8-2) distribute according to the meritorious ratio of exerting oneself of each bar blower fan line when fan distributes idle increment;
(8-3) the idle controlled nargin of reality of the idle increment and each bar blower fan line of distributing to each bar blower fan line is compared;
If the idle increment (8-4) distributing to each bar blower fan line is less than or equal to the idle controlled nargin of each bar blower fan line, then the idle correction target value of each bar blower fan line is the idle increment distributing to each bar blower fan line;
If the idle increment (8-5) distributing to each bar blower fan line is greater than the idle controlled nargin of each bar blower fan line, then the idle correction target value of each bar blower fan line is the idle controlled nargin of each bar blower fan line;
(8-6) by the idle correction target value summation of each bar blower fan line, total idle correction target value Δ Q is generated 2, according to formula Δ Q ω=| Δ Q ＇-Δ Q 2| calculate total idle correction target value Δ Q 2and the deviate Δ Q between total idle increment Delta Q ＇ ω;
If Δ Q ωin the idle deviation dead band threshold value preset, then the idle correction target value of each bar blower fan line obtained is distributed to each bar blower fan line;
If Δ Q ωnot in the idle deviation dead band threshold value preset, then by Δ Q ωdistribute in the meritorious ratio of exerting oneself of each bar blower fan line still having between each bar blower fan line of idle controlled nargin, again generate the idle correction target value sum Δ Q of each bar blower fan line 2, and calculate Δ Q ω, until Δ Q ωenter in the idle deviation dead band threshold value that presets, finally obtain each bar blower fan line idle correction target value and be averagely allocated to each bar blower fan line with blower fan.
The idle deviation dead band threshold value preset in described step (8-6) sets based on experience value, generally can get 0.1MVar ~ 0.3MVar.
Superiority of the present invention is: 1. can make full use of the rapidity that dynamic reactive compensation device regulates, stabilize the change of voltage quick irregular, meeting reactive voltage service requirement simultaneously, retain the rapid adjustability of SVG as far as possible, improved the reserve capacity of dynamic reactive compensation device by idle displacement, can be the emergencies such as power grid accident provides dynamic reactive for subsequent use; 2., based on the distributed balance characteristic of reactive voltage, carry out controller by blower fan line and set up mould, by many reactive sources cooperation, bucking voltage changes slowly, maintains grid-connected point voltage and meets the demands.
(4) accompanying drawing illustrates:
The control flow schematic diagram of the control method of Fig. 1 a kind of wind energy turbine set AVC involved by the present invention.
(5) embodiment:
Embodiment: the control method (see Fig. 1) of a kind of wind energy turbine set AVC, it comprises the following steps:
(1) the wind farm grid-connected point voltage desired value U that dispatching patcher issues is obtained target, obtain wind farm grid-connected some busbar voltage measured value U meaand the real-time status data of blower fan and reactive power compensator, operation information and booster stations electric quantity information;
(2) according to formula Δ U=|U target-U mea| calculate wind farm grid-connected point voltage deviate Δ U; If voltage deviation value Δ U is in the voltage deviation dead band threshold value preset, then enter step (3); Otherwise enter step (4);
(3) carry out idle displacement, return step (1);
(4) in conjunction with the idle sensitivity of wind farm grid-connected point voltage, idle increment Delta Q is calculated;
(5) idle increment is carried out between each main transformer just sub-distribution;
(6) according to separate unit main transformer with blower fan and the idle controlled nargin of reactive-load compensation equipment, calculate the idle controlled nargin of separate unit main transformer;
(7) calculate the idle correction target value of each main transformer in conjunction with the idle controlled nargin of separate unit main transformer and the result of first sub-distribution, and it is carried out sub-distribution again between each main transformer;
(8) by the idle increment Delta Q ＇ again distributing to separate unit main transformer respectively each main transformer with blower fan and reactive power compensator between distribute;
(9) generate idle control objectives according to the idle increment allocation result of step (8), send idle control command according to idle control objectives to blower fan and reactive power compensator.
(10) turn to step (1), enter next computing cycle.
In described step (2), voltage deviation dead band threshold value should be the wind farm grid-connected point voltage undulate quantity of permission.
The concrete grammar carrying out idle displacement in described step (3) is made up of following steps:
(3-1) setting idle displacement increment is based on experience value Δ Q z, generally can get 0.5MVar ~ 1.5MVar;
(3-2) the idle output total amount Q of dynamic reactive compensation device under each main transformer is calculated respectively s, and the idle output total amount Q of blower fan f;
(3-3) at every turn newly-generated Q is judged fwith the Q that last time generates fwhether in the deviation range of setting, if in the deviation range of setting, directly return step (1), if not in the deviation range of setting, enter step (3-4);
(3-4) Q is judged ssymbol;
If Q s>0, then the idle increment distributed to dynamic reactive compensation device is-Δ Q z, the total idle increment that fan distributes is+Δ Q z, and carry out idle output, return step (1);
If Q s<0, then the idle increment distributed to dynamic reactive compensation device is+Δ Q z, the total idle increment that fan distributes is-Δ Q z, and carry out idle output, return step (1);
In described step (5), the method for idle increment being carried out just sub-distribution is between each main transformer, distribute idle increment according to the meritorious ratio of exerting oneself of each main transformer.
Described step (7) calculates the idle correction target value of each main transformer in conjunction with the idle controlled nargin of separate unit main transformer and the result of first sub-distribution, and the method for it being carried out between each main transformer sub-distribution is again made up of following steps:
(7-1) the idle controlled nargin of the idle increment and separate unit main transformer of distributing to separate unit main transformer is compared;
If the idle increment (7-2) distributing to separate unit main transformer is less than or equal to the idle controlled nargin of separate unit main transformer, then the idle correction target value of separate unit main transformer is the idle increment distributing to separate unit main transformer;
If the idle increment (7-3) distributing to separate unit main transformer is greater than the idle controlled nargin of separate unit main transformer, then the idle correction target value of separate unit main transformer is the idle controlled nargin of separate unit main transformer;
(7-4) by the idle correction target value summation of each main transformer, total idle correction target value Δ Q is generated 1, according to formula Δ Q ε=| Δ Q-Δ Q 1| calculate total idle correction target value Δ Q 1and the deviate Δ Q between total idle increment Delta Q ε;
If Δ Q εin the idle deviation dead band threshold value preset, then the idle correction target value of each the main transformer obtained is distributed to each main transformer;
If Δ Q εnot in the idle deviation dead band threshold value preset, then by Δ Q εthe meritorious ratio of exerting oneself in each main transformer between the separate unit main transformer still having idle controlled nargin is distributed, and again generates the idle correction target value sum Δ Q of each main transformer 1, and calculate Δ Q ε, until Δ Q εenter in the idle deviation dead band threshold value that presets, finally obtain the idle correction target value of each main transformer and distribute to each main transformer.
The idle deviation dead band threshold value that described step (7-4) presets sets based on experience value, and success experience value is 0.5MVar.
In described step (8) by the idle increment Delta Q ＇ again distributing to separate unit main transformer respectively each main transformer with blower fan and reactive power compensator between the concrete grammar that carries out distributing comprise the following steps:
(8-1) first the idle increment again distributing to separate unit main transformer is distributed to dynamic reactive compensation device, if idle increment is greater than the controlled nargin of dynamic reactive compensation device, then will has more part and distribute to blower fan;
(8-2) distribute according to the meritorious ratio of exerting oneself of each bar blower fan line when fan distributes idle increment;
(8-3) the idle controlled nargin of reality of the idle increment and each bar blower fan line of distributing to each bar blower fan line is compared;
If the idle increment (8-4) distributing to each bar blower fan line is less than or equal to the idle controlled nargin of each bar blower fan line, then the idle correction target value of each bar blower fan line is the idle increment distributing to each bar blower fan line;
If the idle increment (8-5) distributing to each bar blower fan line is greater than the idle controlled nargin of each bar blower fan line, then the idle correction target value of each bar blower fan line is the idle controlled nargin of each bar blower fan line;
(8-6) by the idle correction target value summation of each bar blower fan line, total idle correction target value Δ Q is generated 2, according to formula Δ Q ω=| Δ Q ＇-Δ Q 2| calculate total idle correction target value Δ Q 2and the deviate Δ Q between total idle increment Delta Q ＇ ω;
If Δ Q ωin the idle deviation dead band threshold value preset, then the idle correction target value of each bar blower fan line obtained is distributed to each bar blower fan line;
If Δ Q ωnot in the idle deviation dead band threshold value preset, then by Δ Q ωdistribute in the meritorious ratio of exerting oneself of each bar blower fan line still having between each bar blower fan line of idle controlled nargin, again generate the idle correction target value sum Δ Q of each bar blower fan line 2, and calculate Δ Q ω, until Δ Q ωenter in the idle deviation dead band threshold value that presets, finally obtain each bar blower fan line idle correction target value and be averagely allocated to each bar blower fan line with blower fan.
The idle deviation dead band threshold value preset in described step (8-6) sets based on experience value, and success experience value is 0.2MVar).
Below in conjunction with accompanying drawing, the present invention is further described.
1) the wind farm grid-connected point voltage desired value U that dispatching patcher issues is obtained target, obtain wind farm grid-connected some busbar voltage measured value U meaand the real-time status data of blower fan and reactive power compensator, operation information and booster stations electric quantity information;
2) wind farm grid-connected point voltage deviate Δ U is calculated according to formula Δ U=|Utarget-Umea|; If voltage deviation value Δ U is in the voltage deviation dead band threshold value preset, then enter step 3); Otherwise enter step 4;
Described voltage deviation dead band threshold value should be the wind farm grid-connected point voltage undulate quantity of permission.
3) carry out idle displacement, specifically comprise the following steps:
3-1) setting idle displacement increment is based on experience value Δ Q z;
3-2) calculate the idle output total amount Q of dynamic reactive compensation device under each main transformer respectively s, and the idle output total amount Q of blower fan f;
3-3) judge at every turn newly-generated Q fwith the Q that last time generates fwhether in the deviation range of setting, if in the deviation range of setting, directly return step 1), if not in the deviation range of setting, enter step 3-4);
3-4) judge Q ssymbol;
If Q s>0, then the idle increment distributed to dynamic reactive compensation device is-Δ Q z, the total idle increment that fan distributes is+Δ Q z, and carry out idle output, return step 1);
If Q s<0, then the idle increment distributed to dynamic reactive compensation device is+Δ Q z, the total idle increment that fan distributes is-Δ Q z, and carry out idle output, return step 1);
4) in conjunction with the idle sensitivity of wind farm grid-connected point voltage, idle increment Delta Q is calculated;
5) idle increment is carried out between each main transformer just sub-distribution;
The method of idle increment being carried out just sub-distribution is between each main transformer, distribute idle increment according to the meritorious ratio of exerting oneself of each main transformer.
6) according to separate unit main transformer with blower fan and the idle controlled nargin of reactive-load compensation equipment, calculate the idle controlled nargin of separate unit main transformer;
7) calculate the idle correction target value of each main transformer in conjunction with the idle controlled nargin of separate unit main transformer and the result of first sub-distribution, specifically comprise the following steps:
7-1) the idle controlled nargin of the idle increment and separate unit main transformer of distributing to separate unit main transformer is compared;
If idle increment 7-2) distributing to separate unit main transformer is less than or equal to the idle controlled nargin of separate unit main transformer, then the idle correction target value of separate unit main transformer is the idle increment distributing to separate unit main transformer;
If idle increment 7-3) distributing to separate unit main transformer is greater than the idle controlled nargin of separate unit main transformer, then the idle correction target value of separate unit main transformer is the idle controlled nargin of separate unit main transformer.
7-4) by the idle correction target value summation of each main transformer, generate total idle correction target value Δ Q 1, according to formula Δ Q ε=| Δ Q-Δ Q 1| calculate total idle correction target value Δ Q 1and the deviate Δ Q between total idle increment Delta Q ε;
If Δ Q εin the idle deviation dead band threshold value preset, then the idle correction target value of each the main transformer obtained is distributed to each main transformer;
If Δ Q εnot in the idle deviation dead band threshold value preset, then by Δ Q εthe meritorious ratio of exerting oneself in each main transformer between the separate unit main transformer still having idle controlled nargin is distributed, and again generates the idle correction target value sum Δ Q of each main transformer 1, and calculate Δ Q ε, until Δ Q εenter in the idle deviation dead band threshold value that presets, finally obtain the idle correction target value of each main transformer and distribute to each main transformer.
The above-mentioned idle deviation dead band threshold value preset sets based on experience value.
8) by the idle increment Delta Q ＇ again distributing to separate unit main transformer respectively each main transformer with blower fan and reactive power compensator between distribute, specifically comprise the following steps:
8-1) first the idle increment again distributing to separate unit main transformer is distributed to dynamic reactive compensation device, if idle increment is greater than the controlled nargin of dynamic reactive compensation device, then will has more part and distribute to blower fan.
8-2) distribute according to the meritorious ratio of exerting oneself of each bar blower fan line when fan distributes idle increment;
8-3) the idle controlled nargin of reality of the idle increment and each bar blower fan line of distributing to each bar blower fan line is compared;
If idle increment 8-4) distributing to each bar blower fan line is less than or equal to the idle controlled nargin of each bar blower fan line, then the idle correction target value of each bar blower fan line is the idle increment distributing to each bar blower fan line;
If idle increment 8-5) distributing to each bar blower fan line is greater than the idle controlled nargin of each bar blower fan line, then the idle correction target value of each bar blower fan line is the idle controlled nargin of each bar blower fan line.
8-6) by the idle correction target value summation of each bar blower fan line, generate total idle correction target value Δ Q 2, according to formula Δ Q ω=| Δ Q ＇-Δ Q 2| calculate total idle correction target value Δ Q 2and the deviate Δ Q between total idle increment Delta Q ＇ ω;
If Δ Q ωin the idle deviation dead band threshold value preset, then the idle correction target value of each bar blower fan line obtained is distributed to each bar blower fan line;
If Δ Q ωnot in the idle deviation dead band threshold value preset, then by Δ Q ωdistribute in the meritorious ratio of exerting oneself of each bar blower fan line still having between each bar blower fan line of idle controlled nargin, again generate the idle correction target value sum Δ Q of each bar blower fan line 2, and calculate Δ Q ω, until Δ Q ωenter in the idle deviation dead band threshold value that presets, finally obtain each bar blower fan line idle correction target value and distribute to each bar blower fan line with blower fan.
The above-mentioned idle deviation dead band threshold value preset sets based on experience value.
9) according to step 8) idle increment allocation result generate idle control objectives, send idle control command according to idle control objectives to blower fan and reactive power compensator.
10) turn to step 1, enter next computing cycle.

Claims (8)

1. a control method of wind energy turbine set AVC, is characterized in that it comprises the following steps:
(1) the wind farm grid-connected point voltage desired value U that dispatching patcher issues is obtained target, obtain wind farm grid-connected some busbar voltage measured value U meaand the real-time status data of blower fan and reactive power compensator, operation information and booster stations electric quantity information;
(2) according to formula Δ U=|U target-U mea| calculate wind farm grid-connected point voltage deviate Δ U; If voltage deviation value Δ U is in the voltage deviation dead band threshold value preset, then enter step 3); Otherwise enter step (4);
(3) carry out idle displacement, return step (1);
(4) in conjunction with the idle sensitivity of wind farm grid-connected point voltage, idle increment Delta Q is calculated;
(5) idle increment is carried out between each main transformer just sub-distribution;
(6) according to separate unit main transformer with blower fan and the idle controlled nargin of reactive-load compensation equipment, calculate the idle controlled nargin of separate unit main transformer;
(7) calculate the idle correction target value of each main transformer in conjunction with the idle controlled nargin of separate unit main transformer and the result of first sub-distribution, and it is carried out sub-distribution again between each main transformer;
(8) by the idle increment Delta Q ＇ again distributing to separate unit main transformer respectively each main transformer with blower fan and reactive power compensator between distribute;
(9) generate idle control objectives according to the idle increment allocation result of step (8), send idle control command according to idle control objectives to blower fan and reactive power compensator.
(10) turn to step (1), enter next computing cycle.
2. the control method of a kind of wind energy turbine set AVC according to claim 1, is characterized in that in described step (2), voltage deviation dead band threshold value should be the wind farm grid-connected point voltage undulate quantity of permission.
3. the control method of a kind of wind energy turbine set AVC according to claim 1, is characterized in that the concrete grammar carrying out idle displacement in described step (3) is made up of following steps:
(3-1) setting idle displacement increment is based on experience value Δ Q z, generally can get 0.5MVar ~ 1.5MVar;
(3-2) the idle output total amount Q of dynamic reactive compensation device under each main transformer is calculated respectively s, and the idle output total amount Q of blower fan f;
(3-3) at every turn newly-generated Q is judged fwith the Q that last time generates fwhether in the deviation range of setting, if in the deviation range of setting, directly return step (1), if not in the deviation range of setting, enter step (3-4);
(3-4) Q is judged ssymbol:
If Q s>0, then the idle increment distributed to dynamic reactive compensation device is-Δ Q z, the total idle increment that fan distributes is+Δ Q z, and carry out idle output, return step (1);
If Q s<0, then the idle increment distributed to dynamic reactive compensation device is+Δ Q z, the total idle increment that fan distributes is-Δ Q z, and carry out idle output, return step (1).
4. the control method of a kind of wind energy turbine set AVC according to claim 1, is characterized in that in described step (5), and the method for idle increment being carried out just sub-distribution is between each main transformer, distribute idle increment according to the meritorious ratio of exerting oneself of each main transformer.
5. the control method of a kind of wind energy turbine set AVC according to claim 1, it is characterized in that described step (7) calculates the idle correction target value of each main transformer in conjunction with the idle controlled nargin of separate unit main transformer and the result of first sub-distribution, and the method for it being carried out between each main transformer sub-distribution is again made up of following steps:
(7-1) the idle controlled nargin of the idle increment and separate unit main transformer of distributing to separate unit main transformer is compared;
If the idle increment (7-2) distributing to separate unit main transformer is less than or equal to the idle controlled nargin of separate unit main transformer, then the idle correction target value of separate unit main transformer is the idle increment distributing to separate unit main transformer;
If the idle increment (7-3) distributing to separate unit main transformer is greater than the idle controlled nargin of separate unit main transformer, then the idle correction target value of separate unit main transformer is the idle controlled nargin of separate unit main transformer;
(7-4) by the idle correction target value summation of each main transformer, total idle correction target value Δ Q is generated 1, according to formula Δ Q ε=| Δ Q-Δ Q 1| calculate total idle correction target value Δ Q 1and the deviate Δ Q between total idle increment Delta Q ε;
If Δ Q εin the idle deviation dead band threshold value preset, then the idle correction target value of each the main transformer obtained is distributed to each main transformer;
If Δ Q εnot in the idle deviation dead band threshold value preset, then by Δ Q εthe meritorious ratio of exerting oneself in each main transformer between the separate unit main transformer still having idle controlled nargin is distributed, and again generates the idle correction target value sum Δ Q of each main transformer 1, and calculate Δ Q ε, until Δ Q εenter in the idle deviation dead band threshold value that presets, finally obtain the idle correction target value of each main transformer and distribute to each main transformer.
6. the control method of a kind of wind energy turbine set AVC according to claim 5, is characterized in that the idle deviation dead band threshold value that described step (7-4) presets sets based on experience value, generally can get 0.3MVar ~ 0.6MVar.
7. the control method of a kind of wind energy turbine set AVC according to claim 1, it is characterized in that in described step (8) by the idle increment Delta Q ＇ again distributing to separate unit main transformer respectively each main transformer with blower fan and reactive power compensator between the concrete grammar that carries out distributing comprise the following steps:
(8-1) first the idle increment again distributing to separate unit main transformer is distributed to dynamic reactive compensation device, if idle increment is greater than the controlled nargin of dynamic reactive compensation device, then will has more part and distribute to blower fan;
(8-2) distribute according to the meritorious ratio of exerting oneself of each bar blower fan line when fan distributes idle increment;
(8-3) the idle controlled nargin of reality of the idle increment and each bar blower fan line of distributing to each bar blower fan line is compared;
If the idle increment (8-4) distributing to each bar blower fan line is less than or equal to the idle controlled nargin of each bar blower fan line, then the idle correction target value of each bar blower fan line is the idle increment distributing to each bar blower fan line;
If the idle increment (8-5) distributing to each bar blower fan line is greater than the idle controlled nargin of each bar blower fan line, then the idle correction target value of each bar blower fan line is the idle controlled nargin of each bar blower fan line;
(8-6) by the idle correction target value summation of each bar blower fan line, total idle correction target value Δ Q is generated 2, according to formula Δ Q ω=| Δ Q ＇-Δ Q 2| calculate total idle correction target value Δ Q 2and the deviate Δ Q between total idle increment Delta Q ＇ ω;
If Δ Q ωin the idle deviation dead band threshold value preset, then the idle correction target value of each bar blower fan line obtained is distributed to each bar blower fan line;
If Δ Q ωnot in the idle deviation dead band threshold value preset, then by Δ Q ωdistribute in the meritorious ratio of exerting oneself of each bar blower fan line still having between each bar blower fan line of idle controlled nargin, again generate the idle correction target value sum Δ Q of each bar blower fan line 2, and calculate Δ Q ω, until Δ Q ωenter in the idle deviation dead band threshold value that presets, finally obtain each bar blower fan line idle correction target value and be averagely allocated to each bar blower fan line with blower fan.
8. the control method of a kind of wind energy turbine set AVC according to claim 7, is characterized in that the idle deviation dead band threshold value preset in described step (8-6) sets based on experience value, generally can get 0.1MVar ~ 0.3MVar.
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