CN105429178A - Control method for photovoltaic power station AVC - Google Patents

Control method for photovoltaic power station AVC Download PDF

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Publication number
CN105429178A
CN105429178A CN201510974791.2A CN201510974791A CN105429178A CN 105429178 A CN105429178 A CN 105429178A CN 201510974791 A CN201510974791 A CN 201510974791A CN 105429178 A CN105429178 A CN 105429178A
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China
Prior art keywords
idle
photovoltaic
main transformer
increment
correction target
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CN105429178B (en
Inventor
任巍曦
刘宏勇
朱跃
寇建
王德伟
赵雷庆
李洋
姚城
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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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    • H02J3/383—
    • 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
    • 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
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

The invention discloses a control method for a photovoltaic power station AVC. A reactive power distribution method of a photovoltaic power station can be provided according to a deviation between a target value of a grid-connected point voltage of the photovoltaic power station and a measured value of a grid-connected point busbar voltage. According to the control method disclosed by the invention, an irregular quick change of the voltage can be stabilized by fully utilizing the adjustment speedability of a dynamic reactive power compensation device; the quick adjusting capability of the SVG is reserved as much as possible when the operating requirements of a reactive voltage are met; and a dynamic reactive power is provided for emergency situations of a power grid accident and the like for later use. On the basis of distributed balance characteristics of the reactive voltage, modeling of a control unit is carried out according to a photovoltaic wire; a slow change of the voltage is compensated through coordination and cooperation of a plurality of reactive sources; and the requirements of the grid-connected point voltage are maintained.

Description

The control method of a kind of photovoltaic plant AVC
(1) technical field:
The present invention relates to control technique in power system technical field, particularly relate to a kind of photovoltaic plant 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, photovoltaic generation obtains and develops fast.Along with the continuous increase of photovoltaic plant installed capacity, the safe and stable operation situation of parallel networking type photovoltaic power station and access area power grid thereof receives publicity day by day, and one of them importance is exactly that large-scale photovoltaic electricity generation grid-connecting can cause voltage ripple of power network.
Newly-built photovoltaic plant 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 photovoltaic plant 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 photovoltaic DC-to-AC converter and reactive power compensator in photovoltaic plant; take the preferential photovoltaic DC-to-AC converter that regulates idle; secondly regulate the principle that reactive power compensator is idle, maintain the stable of photovoltaic electric station grid connection 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 photovoltaic plant 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 photovoltaic plant AVC, is characterized in that it comprises the following steps:
(1) the photovoltaic electric station grid connection point voltage desired value U that dispatching patcher issues is obtained target, obtain photovoltaic electric station grid connection point busbar voltage measured value U meaand the real-time status data of photovoltaic DC-to-AC converter and reactive power compensator, operation information and booster stations electric quantity information;
(2) according to formula Δ U=|U target-U mea| calculate photovoltaic electric station grid connection 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 photovoltaic electric station grid connection 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 photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter 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 photovoltaic electric station grid connection 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 photovoltaic DC-to-AC converter 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 distributed to photovoltaic DC-to-AC converter 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 distributed to photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter;
(8-2) distribute according to the meritorious ratio of exerting oneself of each bar photovoltaic wire when distributing idle increment to photovoltaic DC-to-AC converter;
(8-3) the idle controlled nargin of reality of the idle increment and each bar photovoltaic wire of distributing to each bar photovoltaic wire is compared;
If the idle increment (8-4) distributing to each bar photovoltaic wire is less than or equal to the idle controlled nargin of each bar photovoltaic wire, then the idle correction target value of each bar photovoltaic wire is the idle increment distributing to each bar photovoltaic wire;
If the idle increment (8-5) distributing to each bar photovoltaic wire is greater than the idle controlled nargin of each bar photovoltaic wire, then the idle correction target value of each bar photovoltaic wire is the idle controlled nargin of each bar photovoltaic wire;
(8-6) by the idle correction target value summation of each bar photovoltaic wire, 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 photovoltaic wire obtained is distributed to each bar photovoltaic wire;
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 photovoltaic wire still having between each bar photovoltaic wire of idle controlled nargin, again generate the idle correction target value sum Δ Q of each bar photovoltaic wire 2, and calculate Δ Q ω, until Δ Q ωenter in the idle deviation dead band threshold value that presets, finally obtain each bar photovoltaic wire idle correction target value and be averagely allocated to each bar photovoltaic wire with photovoltaic.
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 photovoltaic wire 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 Fig. 1 control method of a kind of photovoltaic plant AVC involved by the present invention.
(5) embodiment:
Embodiment: the control method (see Fig. 1) of a kind of photovoltaic plant AVC, is characterized in that it comprises the following steps:
(1) the photovoltaic electric station grid connection point voltage desired value U that dispatching patcher issues is obtained target, obtain photovoltaic electric station grid connection point busbar voltage measured value U meaand the real-time status data of photovoltaic DC-to-AC converter and reactive power compensator, operation information and booster stations electric quantity information;
(2) according to formula Δ U=|U target-U mea| calculate photovoltaic electric station grid connection 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 photovoltaic electric station grid connection 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 photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter 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 photovoltaic electric station grid connection 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 success experience value is 1MVar;
(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 photovoltaic DC-to-AC converter 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 distributed to photovoltaic DC-to-AC converter 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 distributed to photovoltaic DC-to-AC converter 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 generally can get 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 photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter;
(8-2) distribute according to the meritorious ratio of exerting oneself of each bar photovoltaic wire when distributing idle increment to photovoltaic DC-to-AC converter;
(8-3) the idle controlled nargin of reality of the idle increment and each bar photovoltaic wire of distributing to each bar photovoltaic wire is compared;
If the idle increment (8-4) distributing to each bar photovoltaic wire is less than or equal to the idle controlled nargin of each bar photovoltaic wire, then the idle correction target value of each bar photovoltaic wire is the idle increment distributing to each bar photovoltaic wire;
If the idle increment (8-5) distributing to each bar photovoltaic wire is greater than the idle controlled nargin of each bar photovoltaic wire, then the idle correction target value of each bar photovoltaic wire is the idle controlled nargin of each bar photovoltaic wire;
(8-6) by the idle correction target value summation of each bar photovoltaic wire, 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 photovoltaic wire obtained is distributed to each bar photovoltaic wire;
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 photovoltaic wire still having between each bar photovoltaic wire of idle controlled nargin, again generate the idle correction target value sum Δ Q of each bar photovoltaic wire 2, and calculate Δ Q ω, until Δ Q ωenter in the idle deviation dead band threshold value that presets, finally obtain each bar photovoltaic wire idle correction target value and be averagely allocated to each bar photovoltaic wire with photovoltaic.
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 photovoltaic electric station grid connection point voltage desired value U that dispatching patcher issues is obtained target, obtain photovoltaic electric station grid connection point busbar voltage measured value U meaand the real-time status data of photovoltaic DC-to-AC converter and reactive power compensator, operation information and booster stations electric quantity information;
2) photovoltaic electric station grid connection 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 photovoltaic electric station grid connection 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 photovoltaic DC-to-AC converter 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 distributed to photovoltaic DC-to-AC converter 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 distributed to photovoltaic DC-to-AC converter is-Δ Q z, and carry out idle output, return step 1);
4) in conjunction with the idle sensitivity of photovoltaic electric station grid connection 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 photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter.
8-2) distribute according to the meritorious ratio of exerting oneself of each bar photovoltaic DC-to-AC converter line when distributing idle increment to photovoltaic DC-to-AC converter;
8-3) the idle controlled nargin of reality of the idle increment and each bar photovoltaic DC-to-AC converter line of distributing to each bar photovoltaic DC-to-AC converter line is compared;
If idle increment 8-4) distributing to each bar photovoltaic DC-to-AC converter line is less than or equal to the idle controlled nargin of each bar photovoltaic DC-to-AC converter line, then the idle correction target value of each bar photovoltaic DC-to-AC converter line is the idle increment distributing to each bar photovoltaic DC-to-AC converter line;
If idle increment 8-5) distributing to each bar photovoltaic DC-to-AC converter line is greater than the idle controlled nargin of each bar photovoltaic DC-to-AC converter line, then the idle correction target value of each bar photovoltaic DC-to-AC converter line is the idle controlled nargin of each bar photovoltaic DC-to-AC converter line.
8-6) by the idle correction target value summation of each bar photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter line obtained is distributed to each bar photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter line still having between each bar photovoltaic DC-to-AC converter line of idle controlled nargin, again generate the idle correction target value sum Δ Q of each bar photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter line idle correction target value and distribute to each bar photovoltaic DC-to-AC converter line with photovoltaic DC-to-AC converter.
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 photovoltaic DC-to-AC converter and reactive power compensator.
10) turn to step 1, enter next computing cycle.

Claims (8)

1. a control method of photovoltaic plant AVC, is characterized in that it comprises the following steps:
(1) the photovoltaic electric station grid connection point voltage desired value U that dispatching patcher issues is obtained target, obtain photovoltaic electric station grid connection point busbar voltage measured value U meaand the real-time status data of photovoltaic DC-to-AC converter and reactive power compensator, operation information and booster stations electric quantity information;
(2) according to formula Δ U=|U target-U mea| calculate photovoltaic electric station grid connection 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 photovoltaic electric station grid connection 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 photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter and reactive power compensator.
(10) turn to step (1), enter next computing cycle.
2. the control method of a kind of photovoltaic plant AVC according to claim 1, is characterized in that in described step (2), voltage deviation dead band threshold value should be the photovoltaic electric station grid connection point voltage undulate quantity of permission.
3. the control method of a kind of photovoltaic plant 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 photovoltaic DC-to-AC converter 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 distributed to photovoltaic DC-to-AC converter 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 distributed to photovoltaic DC-to-AC converter is-Δ Q z, and carry out idle output, return step (1).
4. the control method of a kind of photovoltaic plant AVC according to claim 1, it is characterized in that 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.
5. the control method of a kind of photovoltaic plant 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 photovoltaic plant 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 photovoltaic plant 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 photovoltaic DC-to-AC converter 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 photovoltaic DC-to-AC converter;
(8-2) distribute according to the meritorious ratio of exerting oneself of each bar photovoltaic wire when distributing idle increment to photovoltaic DC-to-AC converter;
(8-3) the idle controlled nargin of reality of the idle increment and each bar photovoltaic wire of distributing to each bar photovoltaic wire is compared;
If the idle increment (8-4) distributing to each bar photovoltaic wire is less than or equal to the idle controlled nargin of each bar photovoltaic wire, then the idle correction target value of each bar photovoltaic wire is the idle increment distributing to each bar photovoltaic wire;
If the idle increment (8-5) distributing to each bar photovoltaic wire is greater than the idle controlled nargin of each bar photovoltaic wire, then the idle correction target value of each bar photovoltaic wire is the idle controlled nargin of each bar photovoltaic wire;
(8-6) by the idle correction target value summation of each bar photovoltaic wire, 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 photovoltaic wire obtained is distributed to each bar photovoltaic wire;
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 photovoltaic wire still having between each bar photovoltaic wire of idle controlled nargin, again generate the idle correction target value sum Δ Q of each bar photovoltaic wire 2, and calculate Δ Q ω, until Δ Q ωenter in the idle deviation dead band threshold value that presets, finally obtain each bar photovoltaic wire idle correction target value and be averagely allocated to each bar photovoltaic wire with photovoltaic.
8. the control method of a kind of photovoltaic plant 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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