CN105429178B - Photovoltaic power station AVC control method - Google Patents
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Abstract
A control method of AVC of a photovoltaic power station can provide a reactive power distribution method of the photovoltaic power station according to deviation of a grid-connected point voltage target value and a grid-connected point bus voltage measured value of the photovoltaic power station. The invention can fully utilize the rapidity of the adjustment of the dynamic reactive power compensation device, stabilize the rapid and irregular change of the voltage, meet the reactive voltage operation requirement, simultaneously reserve the rapid adjustment capability of the SVG as much as possible, and provide dynamic reactive power reserve for emergency situations such as power grid accidents and the like. Based on the characteristic of reactive voltage distributed balance, the modeling of a control unit is carried out according to a photovoltaic line, the voltage is compensated to change slowly through the coordination of multiple reactive power sources, and the voltage of a grid-connected point is maintained to meet the requirement.
Description
The technical field is as follows:
the invention relates to the technical field of power system Control, in particular to an AVC (Automatic Voltage Control) Control method for a photovoltaic power station.
(II) background technology:
in recent years, with the increasing tension of fossil energy supply and the continuous rise of people's attention to global environmental problems such as climate change and the like, the sustainable development of energy is promoted by developing renewable energy to become a consensus of countries in the world, and photovoltaic power generation is rapidly developed. With the continuous increase of installed capacity of photovoltaic power stations, safe and stable operation conditions of grid-connected photovoltaic power stations and power grids accessed to the grid-connected photovoltaic power stations are increasingly concerned, and one important aspect is that voltage fluctuation of the power grids can be caused by large-scale photovoltaic power generation grid connection.
Newly-built photovoltaic power plant has all configured dynamic reactive power compensator, such as SVC, SVG etc. to improve reactive power's dynamic response speed of adjusting. The photovoltaic power station is provided with the dynamic reactive power compensation device with proper capacity, and control and management are carried out according to system requirements, so that the stability of the output voltage of the wind power station can be effectively improved.
Liushu, Zhang Jianzhou and the like of Nanjing Zhongde protection control system limited company provide a coordination control strategy of a photovoltaic inverter and a reactive power compensation device in a photovoltaic power station, and the principle of preferentially adjusting the reactive power of the photovoltaic inverter and then adjusting the reactive power of the reactive power compensation device is adopted to maintain the stability of the voltage of a grid-connected point of the photovoltaic power station. However, the strategy cannot fully exert the rapid regulation capability of the dynamic reactive power compensation device to stabilize the rapid and irregular change of the voltage, and the voltage regulation is easily unqualified.
(III) the invention content:
the invention aims to provide a photovoltaic power station AVC control method which can overcome the defects of the prior art, fully utilizes the rapidity of regulation of a dynamic reactive power compensation device by coordinately controlling multi-source reactive equipment, stabilizes the rapid and irregular change of voltage, meets the reactive voltage operation requirement, simultaneously reserves the rapid regulation capability of SVG as far as possible, and can provide dynamic reactive power reserve for emergency situations such as power grid accidents.
The technical scheme of the invention is as follows: a control method of AVC of a photovoltaic power station is characterized by comprising the following steps:
(1) obtaining photovoltaic power station grid-connected point voltage target value U issued by dispatching systemtargetAnd obtaining a voltage measured value U of a grid-connected point bus of the photovoltaic power stationmeaReal-time state data, operation information and booster station electric quantity information of the photovoltaic inverter and the reactive compensation device;
(2) according to the formula Δ U ═ Utarget-UmeaI, calculating a voltage deviation value delta U of a grid-connected point of the photovoltaic power station; if the voltage deviation value delta U is within a preset voltage deviation dead zone threshold value, entering the step (3); otherwise, entering the step (4);
(3) performing reactive replacement, and returning to the step (1);
(4) calculating reactive increment delta Q by combining the voltage reactive sensitivity of a grid-connected point of a photovoltaic power station;
(5) performing primary distribution on the reactive power increment among the main transformers;
(6) calculating the reactive power controllable margin of the single main transformer according to the reactive power controllable margin of the photovoltaic inverter and the reactive power compensation equipment carried by the single main transformer;
(7) calculating reactive power correction target values of the main transformers by combining the reactive power controllable margin of the single main transformer and the result of primary distribution, and redistributing the reactive power correction target values among the main transformers;
(8) respectively distributing the reactive increment delta Q' which is distributed to the single main transformer again among the photovoltaic inverters and the reactive compensation devices carried by the main transformers;
(9) and (4) generating a reactive power control target according to the reactive power increment distribution result in the step (8), and sending a reactive power control instruction to the photovoltaic inverter and the reactive power compensation device according to the reactive power control target.
(10) Turning to the step (1), entering the next calculation period.
And (3) in the step (2), the voltage deviation dead zone threshold value is an allowable photovoltaic power station grid-connected point voltage fluctuation amount.
The specific method for performing reactive power replacement in the step (3) comprises the following steps:
(3-1) setting the reactive replacement increment to DeltaQ according to empirical valueszGenerally, 0.5 MVar-1.5 MVar can be selected;
(3-2) respectively calculating the total reactive output Q of the dynamic reactive compensation device under each main transformersAnd the total reactive output Q of the photovoltaic inverterf；
(3-3) judging Q newly generated at a timefAnd the last generated QfIf the deviation is within the set deviation range, directly returning to the step (1) if the deviation is within the set deviation range, and otherwise, entering the step (3-4);
(3-4) judgment of QsThe symbol of (a);
if Qs>0, the reactive increment distributed to the dynamic reactive power compensation device is delta QzThe total incremental reactive power allocated to the photovoltaic inverter is + delta QzAnd performing reactive output, and returning to the step (1);
if Qs<0, the reactive increment distributed to the dynamic reactive power compensation device is + delta QzThe total reactive power increment allocated to the photovoltaic inverter is-delta QzAnd performing reactive output, and returning to the step (1);
in the step (5), the method for primarily distributing the reactive power increment is to distribute the reactive power increment among the main transformers according to the active power output proportion of the main transformers.
The step (7) is combined with the reactive power controllable margin of a single main transformer and the result of primary distribution to calculate the reactive power correction target value of each main transformer, and the method for redistributing the reactive power correction target value among the main transformers comprises the following steps:
(7-1) comparing the reactive power increment distributed to the single main transformer with the reactive power controllable margin of the single main transformer;
(7-2) if the reactive power increment allocated to the single main transformer is smaller than or equal to the reactive power controllable margin of the single main transformer, the reactive power correction target value of the single main transformer is the reactive power increment allocated to the single main transformer;
(7-3) if the reactive power increment distributed to the single main transformer is larger than the reactive power controllable margin of the single main transformer, the reactive power correction target value of the single main transformer is the reactive power controllable margin of the single main transformer;
(7-4) summing the reactive power correction target values of the main transformers to generate a total reactive power correction target value delta Q1According to the formula Δ Qε＝|ΔQ-ΔQ1I calculate the total reactive power correction target value Delta Q1Deviation value delta Q from total reactive power increment delta Qε；
If Δ QεDistributing the obtained reactive power correction target values of the main transformers to the main transformers within a preset reactive power deviation dead zone threshold;
if Δ QεIf the current is not within the preset reactive power deviation dead zone threshold value, the delta Q is adjustedεDistributing the power output of each main transformer among the single main transformers with the reactive power controllable margin, and generating the sum delta Q of the reactive power correction target values of each main transformer again1And calculating Δ QεUp to Δ QεEntering a preset reactive deviation dead zone threshold value to finally obtainAnd distributing the target reactive power correction value to each main transformer.
The reactive deviation dead zone threshold preset in the step (7-4) is set according to an empirical value, and may generally be 0.3MVar to 0.6 MVar.
The specific method for distributing the reactive power increment delta Q' which is distributed to the single main transformer again among the photovoltaic inverters and the reactive power compensation devices carried by the main transformers in the step (8) comprises the following steps:
(8-1) firstly allocating the reactive increment which is allocated to the single main transformer again to the dynamic reactive compensation device, and if the reactive increment is larger than the controllable margin of the dynamic reactive compensation device, allocating the excess part to the photovoltaic inverter;
(8-2) distributing the active output ratio of each photovoltaic line when distributing the reactive increment to the photovoltaic inverter;
(8-3) comparing the reactive power increment distributed to each photovoltaic line with the actual reactive power controllable margin of each photovoltaic line;
(8-4) if the reactive increment distributed to each photovoltaic line is smaller than or equal to the reactive controllable margin of each photovoltaic line, the reactive correction target value of each photovoltaic line is the reactive increment distributed to each photovoltaic line;
(8-5) if the reactive increment distributed to each photovoltaic line is larger than the reactive controllable margin of each photovoltaic line, the reactive correction target value of each photovoltaic line is the reactive controllable margin of each photovoltaic line;
(8-6) summing the reactive power correction target values of the respective photovoltaic lines to generate a total reactive power correction target value DeltaQ2According to the formula Δ Qω＝|ΔQ＇-ΔQ2I calculate the total reactive power correction target value Delta Q2Deviation Δ Q from the total reactive gain Δ Qω；
If Δ QωDistributing the obtained reactive power correction target value of each photovoltaic line to each photovoltaic line within a preset reactive power deviation dead zone threshold value;
if Δ QωIf the current is not within the preset reactive power deviation dead zone threshold value, the delta Q is adjustedωEach still having controllable margin of reactive powerDistributing the photovoltaic lines according to the active power output proportion of each photovoltaic line, and generating the sum delta Q of the reactive power correction target values of each photovoltaic line again2And calculating Δ QωUp to Δ QωAnd entering a preset reactive deviation dead zone threshold value, finally obtaining a reactive correction target value of each photovoltaic line and averagely distributing the target value to the photovoltaic carried by each photovoltaic line.
The reactive deviation dead zone threshold preset in the step (8-6) is set according to an empirical value, and may generally be 0.1MVar to 0.3 MVar.
The invention has the advantages that: 1. the method has the advantages that the rapidity of the dynamic reactive power compensation device can be fully utilized, the rapid irregular change of the voltage is stabilized, the rapid adjustment capability of the SVG is kept as far as possible while the reactive voltage operation requirement is met, the spare capacity of the dynamic reactive power compensation device is improved through reactive power replacement, and dynamic reactive power spare can be provided for emergency situations such as power grid accidents; 2. based on the characteristic of reactive voltage distributed balance, the modeling of a control unit is carried out according to a photovoltaic line, the voltage is compensated to change slowly through the coordination of multiple reactive power sources, and the voltage of a grid-connected point is maintained to meet the requirement.
(IV) description of the drawings:
fig. 1 is a schematic control flow diagram of a control method of photovoltaic power station AVC related to the present invention.
(V) specific embodiment:
example (b): a control method of photovoltaic power plant AVC (see fig. 1), characterized in that it comprises the following steps:
(1) obtaining photovoltaic power station grid-connected point voltage target value U issued by dispatching systemtargetAnd obtaining a voltage measured value U of a grid-connected point bus of the photovoltaic power stationmeaReal-time state data, operation information and booster station electric quantity information of the photovoltaic inverter and the reactive compensation device;
(2) according to the formula Δ U ═ Utarget-UmeaI, calculating a voltage deviation value delta U of a grid-connected point of the photovoltaic power station; if the voltage deviation value delta U is within a preset voltage deviation dead zone threshold value, entering the step (3); otherwise, entering the step (4);
(3) performing reactive replacement, and returning to the step (1);
(4) calculating reactive increment delta Q by combining the voltage reactive sensitivity of a grid-connected point of a photovoltaic power station;
(5) performing primary distribution on the reactive power increment among the main transformers;
(6) calculating the reactive power controllable margin of the single main transformer according to the reactive power controllable margin of the photovoltaic inverter and the reactive power compensation equipment carried by the single main transformer;
(7) calculating reactive power correction target values of the main transformers by combining the reactive power controllable margin of the single main transformer and the result of primary distribution, and redistributing the reactive power correction target values among the main transformers;
(8) respectively distributing the reactive increment delta Q' which is distributed to the single main transformer again among the photovoltaic inverters and the reactive compensation devices carried by the main transformers;
(9) and (4) generating a reactive power control target according to the reactive power increment distribution result in the step (8), and sending a reactive power control instruction to the photovoltaic inverter and the reactive power compensation device according to the reactive power control target.
(10) Turning to the step (1), entering the next calculation period.
And (3) in the step (2), the voltage deviation dead zone threshold value is an allowable photovoltaic power station grid-connected point voltage fluctuation amount.
The specific method for performing reactive power replacement in the step (3) comprises the following steps:
(3-1) setting the reactive replacement increment to DeltaQ according to empirical valueszA typical empirical value of 1MVar can generally be taken;
(3-2) respectively calculating the total reactive output Q of the dynamic reactive compensation device under each main transformersAnd the total reactive output Q of the photovoltaic inverterf；
(3-3) judging Q newly generated at a timefAnd the last generated QfIf the deviation is within the set deviation range, directly returning to the step (1) if the deviation is within the set deviation range, and otherwise, entering the step (3-4);
(3-4) judgment of QsThe symbol of (a);
if Qs>0, then the reactive increment allocated to the dynamic reactive power compensation device is-ΔQzThe total incremental reactive power allocated to the photovoltaic inverter is + delta QzAnd performing reactive output, and returning to the step (1);
if Qs<0, the reactive increment distributed to the dynamic reactive power compensation device is + delta QzThe total reactive power increment allocated to the photovoltaic inverter is-delta QzAnd performing reactive output, and returning to the step (1);
in the step (5), the method for primarily distributing the reactive power increment is to distribute the reactive power increment among the main transformers according to the active power output proportion of the main transformers.
The step (7) is combined with the reactive power controllable margin of a single main transformer and the result of primary distribution to calculate the reactive power correction target value of each main transformer, and the method for redistributing the reactive power correction target value among the main transformers comprises the following steps:
(7-1) comparing the reactive power increment distributed to the single main transformer with the reactive power controllable margin of the single main transformer;
(7-2) if the reactive power increment allocated to the single main transformer is smaller than or equal to the reactive power controllable margin of the single main transformer, the reactive power correction target value of the single main transformer is the reactive power increment allocated to the single main transformer;
(7-3) if the reactive power increment distributed to the single main transformer is larger than the reactive power controllable margin of the single main transformer, the reactive power correction target value of the single main transformer is the reactive power controllable margin of the single main transformer;
(7-4) summing the reactive power correction target values of the main transformers to generate a total reactive power correction target value delta Q1According to the formula Δ Qε＝|ΔQ-ΔQ1I calculate the total reactive power correction target value Delta Q1Deviation value delta Q from total reactive power increment delta Qε；
If Δ QεDistributing the obtained reactive power correction target values of the main transformers to the main transformers within a preset reactive power deviation dead zone threshold;
if Δ QεIf the current is not within the preset reactive power deviation dead zone threshold value, the delta Q is adjustedεDistributing the active output power of each main transformer among the single main transformers with the reactive power controllable margin, and regenerating each main transformerSum of variable reactive power correction target values Δ Q1And calculating Δ QεUp to Δ QεAnd entering a preset reactive deviation dead zone threshold value, and finally obtaining reactive correction target values of all the main transformers and distributing the reactive correction target values to all the main transformers.
The reactive deviation dead zone threshold preset in the step (7-4) is set according to an empirical value, and a typical empirical value can be generally taken as 0.5 MVar.
The specific method for distributing the reactive power increment delta Q' which is distributed to the single main transformer again among the photovoltaic inverters and the reactive power compensation devices carried by the main transformers in the step (8) comprises the following steps:
(8-1) firstly allocating the reactive increment which is allocated to the single main transformer again to the dynamic reactive compensation device, and if the reactive increment is larger than the controllable margin of the dynamic reactive compensation device, allocating the excess part to the photovoltaic inverter;
(8-2) distributing the active output ratio of each photovoltaic line when distributing the reactive increment to the photovoltaic inverter;
(8-3) comparing the reactive power increment distributed to each photovoltaic line with the actual reactive power controllable margin of each photovoltaic line;
(8-4) if the reactive increment distributed to each photovoltaic line is smaller than or equal to the reactive controllable margin of each photovoltaic line, the reactive correction target value of each photovoltaic line is the reactive increment distributed to each photovoltaic line;
(8-5) if the reactive increment distributed to each photovoltaic line is larger than the reactive controllable margin of each photovoltaic line, the reactive correction target value of each photovoltaic line is the reactive controllable margin of each photovoltaic line;
(8-6) summing the reactive power correction target values of the respective photovoltaic lines to generate a total reactive power correction target value DeltaQ2According to the formula Δ Qω＝|ΔQ＇-ΔQ2I calculate the total reactive power correction target value Delta Q2Deviation Δ Q from the total reactive gain Δ Qω；
If Δ QωWithin the preset reactive deviation dead zone threshold value, distributing the obtained reactive correction target value of each photovoltaic line to each photovoltaic lineA line of relief;
if Δ QωIf the current is not within the preset reactive power deviation dead zone threshold value, the delta Q is adjustedωDistributing the photovoltaic lines with the controllable reactive margin according to the active power output proportion of each photovoltaic line, and regenerating the sum delta Q of the reactive power correction target values of each photovoltaic line2And calculating Δ QωUp to Δ QωAnd entering a preset reactive deviation dead zone threshold value, finally obtaining a reactive correction target value of each photovoltaic line and averagely distributing the target value to the photovoltaic carried by each photovoltaic line.
The reactive deviation dead zone threshold preset in the step (8-6) is set according to an empirical value, and a typical empirical value is 0.2 MVar.
The invention is further described below with reference to the accompanying drawings.
1) Obtaining photovoltaic power station grid-connected point voltage target value U issued by dispatching systemtargetAnd obtaining a voltage measured value U of a grid-connected point bus of the photovoltaic power stationmeaReal-time state data, operation information and booster station electric quantity information of the photovoltaic inverter and the reactive compensation device;
2) calculating a voltage deviation value delta U of a grid-connected point of the photovoltaic power station according to a formula delta U target-U mea; if the voltage deviation value delta U is within a preset voltage deviation dead zone threshold, entering step 3); otherwise, entering step 4;
the voltage deviation dead zone threshold value is an allowable photovoltaic power station grid-connected point voltage fluctuation amount.
3) Performing reactive power replacement, specifically comprising the following steps:
3-1) setting the reactive replacement increment to be delta Q according to empirical valuesz；
3-2) respectively calculating the total reactive output Q of the dynamic reactive compensation device under each main transformersAnd the total reactive output Q of the photovoltaic inverterf；
3-3) judging each newly generated QfAnd the last generated QfWhether the deviation is within the set deviation range or not, if the deviation is within the set deviation range, the step 1) is directly returned, and if the deviation is not within the set deviation range, the step 3-4) is carried out;
3-4) determination of QsThe symbol of (a);
if Qs>0, the reactive increment distributed to the dynamic reactive power compensation device is delta QzThe total incremental reactive power allocated to the photovoltaic inverter is + delta QzAnd performing reactive output, and returning to the step 1);
if Qs<0, the reactive increment distributed to the dynamic reactive power compensation device is + delta QzThe total reactive power increment allocated to the photovoltaic inverter is-delta QzAnd performing reactive output, and returning to the step 1);
4) calculating reactive increment delta Q by combining the voltage reactive sensitivity of a grid-connected point of a photovoltaic power station;
5) performing primary distribution on the reactive power increment among the main transformers;
the method for primarily distributing the reactive power increment comprises the step of distributing the reactive power increment among the main transformers according to the active power output proportion of the main transformers.
6) Calculating the reactive power controllable margin of the single main transformer according to the reactive power controllable margin of the photovoltaic inverter and the reactive power compensation equipment carried by the single main transformer;
7) and calculating the reactive power correction target value of each main transformer by combining the reactive power controllable margin of a single main transformer and the result of primary distribution, and specifically comprising the following steps of:
7-1) comparing the reactive increment distributed to the single main transformer with the reactive controllable margin of the single main transformer;
7-2) if the reactive power increment allocated to the single main transformer is less than or equal to the reactive power controllable margin of the single main transformer, the reactive power correction target value of the single main transformer is the reactive power increment allocated to the single main transformer;
7-3) if the reactive power increment distributed to the single main transformer is larger than the reactive power controllable margin of the single main transformer, the reactive power correction target value of the single main transformer is the reactive power controllable margin of the single main transformer.
7-4) summing the reactive power correction target values of all main transformers to generate a total reactive power correction target value delta Q1According to the formula Δ Qε＝|ΔQ-ΔQ1I calculate the total reactive power correction target value Delta Q1Deviation value delta Q from total reactive power increment delta Qε；
If Δ QεDistributing the obtained reactive power correction target values of the main transformers to the main transformers within a preset reactive power deviation dead zone threshold;
if Δ QεIf the current is not within the preset reactive power deviation dead zone threshold value, the delta Q is adjustedεDistributing the power output of each main transformer among the single main transformers with the reactive power controllable margin, and generating the sum delta Q of the reactive power correction target values of each main transformer again1And calculating Δ QεUp to Δ QεAnd entering a preset reactive deviation dead zone threshold value, and finally obtaining reactive correction target values of all the main transformers and distributing the reactive correction target values to all the main transformers.
The preset reactive deviation dead zone threshold is set according to an empirical value.
8) Respectively distributing the reactive increment delta Q' which is distributed to a single main transformer again among the photovoltaic inverters and the reactive compensation devices carried by each main transformer, and specifically comprising the following steps:
8-1) distributing the reactive increment which is distributed to the single main transformer again to the dynamic reactive compensation device firstly, and distributing the excess part to the photovoltaic inverter if the reactive increment is larger than the controllable margin of the dynamic reactive compensation device.
8-2) distributing the active output proportion of each photovoltaic inverter line when distributing the reactive increment to the photovoltaic inverters;
8-3) comparing the reactive power increment distributed to each photovoltaic inverter line with the actual reactive power controllable margin of each photovoltaic inverter line;
8-4) if the reactive increment distributed to each photovoltaic inverter line is smaller than or equal to the reactive controllable margin of each photovoltaic inverter line, the reactive correction target value of each photovoltaic inverter line is the reactive increment distributed to each photovoltaic inverter line;
8-5) if the reactive increment distributed to each photovoltaic inverter line is larger than the reactive controllable margin of each photovoltaic inverter line, the reactive correction target value of each photovoltaic inverter line is the reactive controllable margin of each photovoltaic inverter line.
8-6) summing the reactive power correction target values of the individual photovoltaic inverter lines to generate a total reactive power correction target value DeltaQ2According to the formula Δ Qω＝|ΔQ＇-ΔQ2I calculate the total reactive power correction target value Delta Q2Deviation Δ Q from the total reactive gain Δ Qω；
If Δ QωDistributing the obtained reactive power correction target value of each photovoltaic inverter line to each photovoltaic inverter line within a preset reactive power deviation dead zone threshold value;
if Δ QωIf the current is not within the preset reactive power deviation dead zone threshold value, the delta Q is adjustedωDistributing the photovoltaic inverter lines with controllable reactive margin according to the active power output proportion of each photovoltaic inverter line, and generating the sum delta Q of the reactive power correction target values of each photovoltaic inverter line again2And calculating Δ QωUp to Δ QωAnd entering a preset reactive deviation dead zone threshold value, finally obtaining a reactive correction target value of each photovoltaic inverter line and distributing the reactive correction target value to the photovoltaic inverters carried by each photovoltaic inverter line.
The preset reactive deviation dead zone threshold is set according to an empirical value.
9) Generating a reactive control target according to the reactive increment distribution result of the step 8), and sending a reactive control instruction to the photovoltaic inverter and the reactive compensation device according to the reactive control target.
10) Turning to the step 1, entering the next calculation period.
Claims (7)
1. A control method of AVC of a photovoltaic power station is characterized by comprising the following steps:
(1) obtaining photovoltaic power station grid-connected point voltage target value U issued by dispatching systemtargetAnd obtaining a voltage measured value U of a grid-connected point bus of the photovoltaic power stationmeaReal-time state data, operation information and booster station electric quantity information of the photovoltaic inverter and the reactive compensation device;
(2) according to the formula Δ U ═ Utarget-UmeaI, calculating a voltage deviation value delta U of a grid-connected point of the photovoltaic power station; such as voltage deviation valueIf the delta U is within the preset voltage deviation dead zone threshold, entering the step (3); otherwise, entering the step (4);
(3) performing reactive replacement, and returning to the step (1);
(4) calculating reactive increment delta Q by combining the voltage reactive sensitivity of a grid-connected point of a photovoltaic power station;
(5) performing primary distribution on the reactive power increment among the main transformers;
(6) calculating the reactive power controllable margin of the single main transformer according to the reactive power controllable margin of the photovoltaic inverter and the reactive power compensation equipment carried by the single main transformer;
(7) the method comprises the following steps of calculating reactive power correction target values of all main transformers by combining reactive power controllable margins of the single main transformers and results of primary distribution, and redistributing the reactive power correction target values among the main transformers, wherein the reactive power correction target values are specifically composed of the following steps:
(7-1) comparing the reactive power increment distributed to the single main transformer with the reactive power controllable margin of the single main transformer;
(7-2) if the reactive power increment allocated to the single main transformer is smaller than or equal to the reactive power controllable margin of the single main transformer, the reactive power correction target value of the single main transformer is the reactive power increment allocated to the single main transformer;
(7-3) if the reactive power increment distributed to the single main transformer is larger than the reactive power controllable margin of the single main transformer, the reactive power correction target value of the single main transformer is the reactive power controllable margin of the single main transformer;
(7-4) summing the reactive power correction target values of the main transformers to generate a total reactive power correction target value delta Q1According to the formula Δ Qε＝|ΔQ-ΔQ1I calculate the total reactive power correction target value Delta Q1Deviation value delta Q from total reactive power increment delta Qε；
If Δ QεDistributing the obtained reactive power correction target values of the main transformers to the main transformers within a preset reactive power deviation dead zone threshold;
if Δ QεIf the current is not within the preset reactive power deviation dead zone threshold value, the delta Q is adjustedεDistributing the power output of each main transformer among the single main transformers with the reactive power controllable margin to generate the reactive power correction target value of each main transformer againAnd Δ Q1And calculating Δ QεUp to Δ QεEntering a preset reactive deviation dead zone threshold value, finally obtaining reactive correction target values of all main transformers and distributing the reactive correction target values to all the main transformers;
(8) respectively distributing the reactive increment delta Q' which is distributed to the single main transformer again among the photovoltaic inverters and the reactive compensation devices carried by the main transformers;
(9) generating a reactive power control target according to the reactive power increment distribution result in the step (8), and sending a reactive power control instruction to the photovoltaic inverter and the reactive power compensation device according to the reactive power control target;
(10) turning to the step (1), entering the next calculation period.
2. The AVC control method for a photovoltaic power plant according to claim 1, wherein the voltage deviation dead zone threshold in step (2) is an allowable photovoltaic power plant grid-connected point voltage fluctuation amount.
3. The method for controlling photovoltaic power plant AVC according to claim 1, characterized in that said specific method for performing reactive substitution in step (3) consists of the following steps:
(3-1) setting the reactive replacement increment to DeltaQ according to empirical valueszThe value range is 0.5 MVar-1.5 MVar;
(3-2) respectively calculating the total reactive output Q of the dynamic reactive compensation device under each main transformersAnd the total reactive output Q of the photovoltaic inverterf；
(3-3) judging Q newly generated at a timefAnd the last generated QfIf the deviation is within the set deviation range, directly returning to the step (1) if the deviation is within the set deviation range, and otherwise, entering the step (3-4);
(3-4) judgment of QsSymbol (c):
if Qs>0, the reactive increment distributed to the dynamic reactive power compensation device is delta QzThe total incremental reactive power allocated to the photovoltaic inverter is + delta QzAnd performing reactive output, and returning to the step (1);
if Qs<0, the reactive increment distributed to the dynamic reactive power compensation device is + delta QzThe total reactive power increment allocated to the photovoltaic inverter is-delta QzAnd performing reactive output and returning to the step (1).
4. The method of claim 1 wherein in step (5) the initial allocation of the reactive power increments is performed by allocating the reactive power increments among the primary substations in proportion to the active power output of the primary substations.
5. The method for controlling AVC of a photovoltaic power plant according to claim 1, wherein the reactive deviation dead zone threshold preset in said step (7-4) is set according to empirical values, and the value range is 0.3MVar to 0.6 MVar.
6. The method for controlling the AVC of a photovoltaic power plant according to claim 1, wherein said step (8) of distributing the increment of reactive power Δ Q're-distributed to the individual main transformers between the photovoltaic inverters and the reactive power compensation devices respectively carried by the individual main transformers comprises the steps of:
(8-1) firstly allocating the reactive increment which is allocated to the single main transformer again to the dynamic reactive compensation device, and if the reactive increment is larger than the controllable margin of the dynamic reactive compensation device, allocating the excess part to the photovoltaic inverter;
(8-2) distributing the active output ratio of each photovoltaic line when distributing the reactive increment to the photovoltaic inverter;
(8-3) comparing the reactive power increment distributed to each photovoltaic line with the actual reactive power controllable margin of each photovoltaic line;
(8-4) if the reactive increment distributed to each photovoltaic line is smaller than or equal to the reactive controllable margin of each photovoltaic line, the reactive correction target value of each photovoltaic line is the reactive increment distributed to each photovoltaic line;
(8-5) if the reactive increment distributed to each photovoltaic line is larger than the reactive controllable margin of each photovoltaic line, the reactive correction target value of each photovoltaic line is the reactive controllable margin of each photovoltaic line;
(8-6) summing the reactive power correction target values of the respective photovoltaic lines to generate a total reactive power correction target value DeltaQ2According to the formula Δ Qω＝|ΔQ＇-ΔQ2I calculate the total reactive power correction target value Delta Q2Deviation Δ Q from the total reactive gain Δ Qω；
If Δ QωDistributing the obtained reactive power correction target value of each photovoltaic line to each photovoltaic line within a preset reactive power deviation dead zone threshold value;
if Δ QωIf the current is not within the preset reactive power deviation dead zone threshold value, the delta Q is adjustedωDistributing the photovoltaic lines with the controllable reactive margin according to the active power output proportion of each photovoltaic line, and regenerating the sum delta Q of the reactive power correction target values of each photovoltaic line2And calculating Δ QωUp to Δ QωAnd entering a preset reactive deviation dead zone threshold value, finally obtaining a reactive correction target value of each photovoltaic line and averagely distributing the target value to the photovoltaic carried by each photovoltaic line.
7. The method for controlling AVC of a photovoltaic power plant according to claim 6, wherein the reactive deviation dead zone threshold preset in said step (8-6) is set according to empirical values, and the value range is 0.1MVar to 0.3 MVar.
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