CN105591391B - Reactive voltage control method for wind-solar-storage combined power station - Google Patents
Reactive voltage control method for wind-solar-storage combined power station Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- 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
A reactive voltage control method for a wind-solar-storage combined power station can provide a reactive power distribution method for the wind-solar-storage combined power station according to a voltage target value of a grid-connected point of the wind-solar-storage combined power station and a deviation of a voltage measured value of a grid-connected point bus, and has the advantages that the reactive power distribution method can give consideration to the reactive power capability of all reactive power sources under each main transformer of the wind-solar-storage combined power station, fully utilizes the rapidity of adjustment of a dynamic reactive power compensation device, realizes reactive power coordination control of a fan, a photovoltaic inverter, an energy storage converter and the reactive power compensation device, and meets the reactive voltage requirement of.
Description
The technical field is as follows:
the invention relates to the technical field of power system control, in particular to a reactive voltage control method for a wind-solar-storage combined power station.
(II) background technology:
in recent years, power generation by renewable clean energy sources such as wind energy, solar energy and the like has been vigorously developed. Wind energy and solar energy power generation have the characteristics of randomness, intermittence, fluctuation and the like, the large-scale access of the wind energy and the solar energy power generation has great influence on the safe and stable operation of a power system, wherein the reactive voltage problem is one of the most common problems in the actual operation.
At present, newly-built wind power plants and photovoltaic power plants are mostly provided with reactive compensation devices with corresponding capacities, and control and management are carried out according to system requirements, so that the stability of grid-connected point voltages of the wind power plants and the photovoltaic power plants can be effectively improved.
According to retrieval, research on coordination control methods of energy storage systems and renewable energy sources such as wind power and photovoltaic power generation at home and abroad mainly focuses on active control, and at present, no effective multi-source reactive coordination control method aiming at wind, light, storage and reactive compensation devices is available, and voltage control instructions issued by voltage tracking scheduling of grid-connected points of wind-solar-storage combined power generation systems are controlled.
(III) the invention content:
the invention aims to provide a reactive voltage control method for a wind-solar-energy storage combined power station, which can overcome the defects of the prior art, and can distribute the reactive power of the wind-solar-energy storage combined power station according to the number of main transformers by combining the condition of active power output, coordinate and control the reactive output of a fan, a photovoltaic inverter, an energy storage converter and a reactive compensation device, fully exert the quick response regulation capability of the dynamic reactive compensation device, ensure that the reactive output of a grid-connected point of the wind-solar-energy storage combined power station meets the change of system load, and maintain the voltage stability of the grid-connected point of the wind-solar-energy.
The technical scheme of the invention is as follows: a wind-solar-storage combined power station reactive voltage control method is characterized by comprising the following steps:
(1) obtaining a grid-connected point voltage target value U of the wind-solar storage combined power station issued by a dispatching systemtargetAnd obtaining a voltage measured value U of a grid-connected point bus of the wind-solar storage combined power stationmeaReal-time state data, operation information and booster station electric quantity information of the fan, the photovoltaic inverter, the energy storage converter and the reactive power 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 wind-light storage combined power station; if the voltage deviation value delta U is within the preset voltage deviation dead zone threshold value, the wind-solar-energy storage combined power station does not perform reactive compensation and returns to the step (1); otherwise, entering the step (3);
(3) calculating reactive power increment delta Q by combining voltage reactive power sensitivity of a grid-connected point of the wind-solar-storage combined power station;
(4) performing primary distribution on the reactive power increment among the main transformers;
(5) calculating the reactive power controllable margin of the single main transformer according to the reactive power controllable margins of a fan, a photovoltaic inverter, an energy storage converter and reactive power compensation equipment which are carried by the single main transformer;
(6) 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;
(7) respectively distributing the reactive increment delta Q' which is distributed to the single main transformer again among a fan, a photovoltaic inverter, an energy storage converter and a reactive power compensation device which are carried by each main transformer;
(8) generating a reactive control target according to the reactive increment distribution result in the step (7), and sending a reactive control instruction to the fan, the photovoltaic inverter, the energy storage converter and the reactive compensation device according to the reactive control target;
(9) 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 grid-connected point voltage fluctuation amount of the wind-solar-storage combined power station.
And (4) distributing the reactive power increment for the first time in the step (4) among the main transformers according to the active power output proportion of the main transformers.
The method for 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 in the step (6) and redistributing the reactive power correction target value among the main transformers comprises the following steps:
(6-1) comparing the reactive power increment distributed to the single main transformer with the reactive power controllable margin of the single main transformer;
(6-2) 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;
(6-3) 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;
(6-4) 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 QεNot at the preset reactive deviation dead zone thresholdIn, then Δ Q will beεDistributing 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 reactive deviation dead zone threshold preset in the step (6-4) 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 fans, the photovoltaic inverters, the energy storage converters and the reactive power compensation devices which are carried by the main transformers in the step (7) comprises the following steps:
and (7-1) 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 parts to a fan, a photovoltaic inverter and an energy storage converter.
(7-2) when the reactive increment is distributed to the fan, the photovoltaic inverter and the energy storage converter, distributing according to the active output proportion of a current collection circuit in which each fan line, each photovoltaic line and each energy storage line are located;
(7-3) comparing the reactive increment distributed to the feeder where each power generation device is located with the reactive controllable margin of each feeder;
(7-4) if the reactive increment distributed to each feeder line is smaller than or equal to the reactive controllable margin of each feeder line, the reactive correction target value of each feeder line is the reactive increment distributed to each feeder line;
and (7-5) if the reactive increment distributed to each feeder line is larger than the reactive controllable margin of each feeder line, the reactive correction target value of each feeder line is the reactive controllable margin of each feeder line.
(7-6) summing the reactive power correction target values of the feeders 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 feeder line to each feeder 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 reactive power between the feeders with the reactive power controllable margin according to the active power output proportion of each feeder, and generating the sum delta Q of the reactive power correction target values of each feeder again2And calculating Δ QωUp to Δ QωAnd entering a preset reactive deviation dead zone threshold value, finally obtaining the reactive correction target value of each feeder line and distributing the reactive correction target value to a fan, a photovoltaic inverter and an energy storage converter carried by each feeder line.
The reactive deviation dead zone threshold preset in the step (7-6) 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 voltage of the grid-connected point of the wind-solar-storage combined power station is used as a control target, the reactive power is used as an adjustment quantity, and a reactive power distribution method of the wind-solar-storage combined power station is provided according to the deviation of the voltage target value of the grid-connected point of the wind-solar-storage combined power station and the voltage measured value of the grid-connected point bus, so that the reactive voltage requirement of a power grid on the wind-solar-storage combined power station can; 2. the method can fully utilize the rapidity of the adjustment of the dynamic reactive power compensation device, fully considers the reactive power output capability of each main transformer and each feeder line in the control process, distributes reactive power increment according to the active power output proportion, and realizes the reactive power coordination control of the fan, the photovoltaic inverter, the energy storage converter and the reactive power compensation device.
(IV) description of the drawings:
fig. 1 is a schematic flow chart of a reactive voltage control method of a wind-solar-energy-storage combined power station related by the invention.
(V) specific embodiment:
example (b): a wind-solar-storage combined power station reactive voltage control method (shown in figure 1) is characterized by comprising the following steps:
(1) acquisition schedulingGrid-connected point voltage target value U of wind-solar-storage combined power station issued by systemtargetAnd obtaining a voltage measured value U of a grid-connected point bus of the wind-solar storage combined power stationmeaReal-time state data, operation information and booster station electric quantity information of the fan, the photovoltaic inverter, the energy storage converter and the reactive power 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 wind-light storage combined power station; if the voltage deviation value delta U is within the preset voltage deviation dead zone threshold value, the wind-solar-energy storage combined power station does not perform reactive compensation and returns to the step (1); otherwise, entering the step (3);
(3) calculating reactive power increment delta Q by combining voltage reactive power sensitivity of a grid-connected point of the wind-solar-storage combined power station;
(4) performing primary distribution on the reactive power increment among the main transformers;
(5) calculating the reactive power controllable margin of the single main transformer according to the reactive power controllable margins of a fan, a photovoltaic inverter, an energy storage converter and reactive power compensation equipment which are carried by the single main transformer;
(6) 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;
(7) respectively distributing the reactive increment delta Q' which is distributed to the single main transformer again among a fan, a photovoltaic inverter, an energy storage converter and a reactive power compensation device which are carried by each main transformer;
(8) generating a reactive control target according to the reactive increment distribution result in the step (7), and sending a reactive control instruction to the fan, the photovoltaic inverter, the energy storage converter and the reactive compensation device according to the reactive control target;
(9) 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 grid-connected point voltage fluctuation amount of the wind-solar-storage combined power station.
And (4) distributing the reactive power increment for the first time in the step (4) among the main transformers according to the active power output proportion of the main transformers.
The method for 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 in the step (6) and redistributing the reactive power correction target value among the main transformers comprises the following steps:
(6-1) comparing the reactive power increment distributed to the single main transformer with the reactive power controllable margin of the single main transformer;
(6-2) 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;
(6-3) 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;
(6-4) 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 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.
And (4) setting a reactive deviation dead zone threshold preset in the step (6-4) according to an empirical value, wherein a typical empirical value is 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 fans, the photovoltaic inverters, the energy storage converters and the reactive power compensation devices which are carried by the main transformers in the step (7) comprises the following steps:
and (7-1) 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 parts to a fan, a photovoltaic inverter and an energy storage converter.
(7-2) when the reactive increment is distributed to the fan, the photovoltaic inverter and the energy storage converter, distributing according to the active output proportion of a current collection circuit in which each fan line, each photovoltaic line and each energy storage line are located;
(7-3) comparing the reactive increment distributed to the feeder where each power generation device is located with the reactive controllable margin of each feeder;
(7-4) if the reactive increment distributed to each feeder line is smaller than or equal to the reactive controllable margin of each feeder line, the reactive correction target value of each feeder line is the reactive increment distributed to each feeder line;
and (7-5) if the reactive increment distributed to each feeder line is larger than the reactive controllable margin of each feeder line, the reactive correction target value of each feeder line is the reactive controllable margin of each feeder line.
(7-6) summing the reactive power correction target values of the feeders 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 feeder line to each feeder 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 reactive power between the feeders with the reactive power controllable margin according to the active power output proportion of each feeder, and generating the sum delta Q of the reactive power correction target values of each feeder again2And calculating Δ QωUp to Δ QωEntering a preset reactive deviation dead zone threshold value to finally obtain a reactive correction target value of each feeder lineAnd the power supply is distributed to a fan, a photovoltaic inverter and an energy storage converter which are carried by each feeder line.
The reactive deviation dead zone threshold preset in the step (7-6) 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 a grid-connected point voltage target value U of the wind-solar storage combined power station issued by a dispatching systemtargetAnd obtaining a voltage measured value U of a grid-connected point bus of the wind-solar storage combined power stationmeaReal-time state data, operation information and booster station electric quantity information of the fan, the photovoltaic inverter, the energy storage converter and the reactive power compensation device;
(2) calculating a grid-connected point voltage deviation value delta U of the wind-light-storage combined power station according to a formula delta U ═ Utarget-Umea |; if the voltage deviation value delta U is within the preset voltage deviation dead zone threshold, the wind-solar-energy storage combined power station does not perform reactive compensation, and the step 1) is returned; otherwise, entering step 3;
the voltage deviation dead zone threshold value is an allowable grid-connected point voltage fluctuation amount of the wind-solar-storage combined power generation station.
(3) Calculating reactive power increment delta Q by combining voltage reactive power sensitivity of a grid-connected point of the wind-solar-storage combined power station;
(4) performing primary distribution on the reactive power increment among the main transformers;
the distribution method is to distribute reactive power increment among the main transformers according to the active power output proportion of the main transformers.
(5) Calculating the reactive power controllable margin of the single main transformer according to the reactive power controllable margins of a fan, a photovoltaic inverter, an energy storage converter and reactive power compensation equipment which are carried by the single main transformer;
(6) 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:
(6-1) comparing the reactive power increment distributed to the single main transformer with the reactive power controllable margin of the single main transformer;
(6-2) 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;
and (6-3) 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.
(6-4) 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 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.
(7) The method comprises the following steps of respectively distributing the reactive increment delta Q' which is distributed to a single main transformer again among a fan, a photovoltaic inverter, an energy storage converter and a reactive power compensation device which are carried by each main transformer:
(7-1) firstly allocating the reactive power increment which is allocated to the single main transformer again to the dynamic reactive power compensation device, and if the reactive power increment is within the controllable margin range of the dynamic reactive power compensation device, completing allocation; and if the reactive increment is larger than the controllable margin of the dynamic reactive compensation device, distributing the excess parts to a fan, a photovoltaic inverter and an energy storage converter.
(7-2) distributing the reactive power increment to the fan, the photovoltaic inverter and the energy storage converter according to the active power output proportion of a feeder line where the fan, the photovoltaic unit and the energy storage unit are located;
(7-3) comparing the reactive increment of the feeder line where the fan, the photovoltaic unit and the energy storage unit are located with the reactive controllable margin of each current collection line;
the reactive power controllable margin of each feeder line is obtained by calculating the reactive power controllable margin of a fan or a photovoltaic inverter or an energy storage converter carried by the feeder line;
(7-4) if the reactive increment distributed to each feeder line is within the reactive controllable margin range of each feeder line, the reactive correction target value of each feeder line is the reactive increment distributed to each feeder line;
and (7-5) if the reactive increment distributed to each feeder line is larger than the reactive controllable margin of each feeder line, the reactive correction target value of each feeder line is the reactive controllable margin of each feeder line.
(7-6) summing the reactive power correction target values of the feeders 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 feeder line to each feeder 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 reactive power between the feeders with the reactive power controllable margin according to the active power output proportion of each feeder, and generating the sum delta Q of the reactive power correction target values of each feeder again2And calculating Δ QωUp to Δ QωAnd entering a preset reactive deviation dead zone threshold value, finally obtaining the reactive correction target value of each feeder line and distributing the reactive correction target value to a fan, a photovoltaic inverter and an energy storage converter carried by each feeder line.
The preset reactive deviation dead zone threshold is set according to an empirical value.
(8) And (4) generating a reactive power control target according to the reactive power increment distribution result in the step (7), and sending a reactive power control instruction to the fan, the photovoltaic inverter, the energy storage converter and the reactive power compensation device according to the reactive power control target.
(9) Turning to the step (1), entering the next calculation period.
Claims (5)
1. A wind-solar-storage combined power station reactive voltage control method is characterized by comprising the following steps:
(1) obtaining a grid-connected point voltage target value U of the wind-solar storage combined power station issued by a dispatching systemtargetAnd obtaining a voltage measured value U of a grid-connected point bus of the wind-solar storage combined power stationmeaReal-time state data, operation information and booster station electric quantity information of the fan, the photovoltaic inverter, the energy storage converter and the reactive power 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 wind-light storage combined power station; if the voltage deviation value delta U is within the preset voltage deviation dead zone threshold value, the wind-solar-energy storage combined power station does not perform reactive compensation and returns to the step (1); otherwise, entering the step (3);
(3) calculating reactive power increment delta Q by combining voltage reactive power sensitivity of a grid-connected point of the wind-solar-storage combined power station;
(4) performing primary distribution on the reactive power increment among the main transformers;
(5) calculating the reactive power controllable margin of the single main transformer according to the reactive power controllable margins of a fan, a photovoltaic inverter, an energy storage converter and reactive power compensation equipment which are carried by the single main transformer;
(6) the reactive power correction target value of each main transformer is calculated by combining the reactive power controllable margin of a single main transformer and the result of primary distribution, and is redistributed among the main transformers, and the method comprises the following steps:
(6-1) comparing the reactive power increment distributed to the single main transformer with the reactive power controllable margin of the single main transformer;
(6-2) 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;
(6-3) 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;
(6-4) 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, finally obtaining reactive correction target values of all main transformers and distributing the reactive correction target values to all the main transformers;
(7) the method is characterized in that the reactive increment delta Q' which is distributed to a single main transformer again is distributed among a fan, a photovoltaic inverter, an energy storage converter and a reactive power compensation device which are carried by each main transformer, and the method comprises the following steps:
(7-1) firstly allocating the reactive increment which is allocated to the single main transformer again to a dynamic reactive compensation device, and if the reactive increment is larger than the controllable margin of the dynamic reactive compensation device, allocating the excess parts to a fan, a photovoltaic inverter and an energy storage converter;
(7-2) when the reactive increment is distributed to the fan, the photovoltaic inverter and the energy storage converter, distributing according to the active output proportion of a current collection circuit in which each fan line, each photovoltaic line and each energy storage line are located;
(7-3) comparing the reactive increment distributed to the feeder where each power generation device is located with the reactive controllable margin of each feeder;
(7-4) if the reactive increment distributed to each feeder line is smaller than or equal to the reactive controllable margin of each feeder line, the reactive correction target value of each feeder line is the reactive increment distributed to each feeder line;
(7-5) if the reactive increment distributed to each feeder line is larger than the reactive controllable margin of each feeder line, the reactive correction target value of each feeder line is the reactive controllable margin of each feeder line;
(7-6) summing the reactive power correction target values of the feeders 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 feeder line to each feeder 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 reactive power between the feeders with the reactive power controllable margin according to the active power output proportion of each feeder, and generating the sum delta Q of the reactive power correction target values of each feeder again2And calculating Δ QωUp to Δ QωEntering a preset reactive deviation dead zone threshold value, finally obtaining a reactive correction target value of each feeder line and distributing the reactive correction target value to a fan, a photovoltaic inverter and an energy storage converter carried by each feeder line;
(8) generating a reactive control target according to the reactive increment distribution result in the step (7), and sending a reactive control instruction to the fan, the photovoltaic inverter, the energy storage converter and the reactive compensation device according to the reactive control target;
(9) turning to the step (1), entering the next calculation period.
2. The reactive voltage control method of the wind-solar-energy storage combined power station according to claim 1, characterized in that the voltage deviation dead zone threshold in the step (2) is an allowable grid-connected point voltage fluctuation amount of the wind-solar-energy storage combined power station.
3. The wind, light and storage combined power plant reactive voltage control method according to claim 1, characterized in that in the step (4), the reactive power increment is primarily distributed among the main transformers according to the active output ratio of the main transformers.
4. The wind, photovoltaic and energy storage combined power plant reactive voltage control method according to claim 1, characterized in that the preset reactive deviation dead zone threshold in the step (6-4) is set according to an empirical value, and the value range is 0.3 MVar-0.6 MVar.
5. The wind, photovoltaic and energy storage combined power plant reactive voltage control method according to claim 1, characterized in that the preset reactive deviation dead zone threshold in the step (7-6) is set according to an empirical value, and the value range is 0.1 MVar-0.3 MVar.
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| CN106786625B (en) * | 2016-12-20 | 2023-10-13 | 国网天津市电力公司 | Power distribution network voltage coordination control method based on distributed energy supply system interaction capability |
| CN107069816B (en) * | 2017-04-24 | 2018-02-16 | 广东电网有限责任公司佛山供电局 | The reactive coordination control method and device of distributed power generation unit |
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| CN109787282B (en) * | 2019-01-29 | 2022-09-02 | 国电南瑞科技股份有限公司 | Large-scale energy storage participation new energy station reactive power coordination control method and system |
| CN112398154B (en) * | 2020-11-04 | 2022-07-26 | 国网北京市电力公司 | Energy storage power station optimization control method, system, device and storage medium |
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| CN114421522B (en) * | 2021-12-30 | 2023-05-02 | 中国华能集团清洁能源技术研究院有限公司 | Photovoltaic power station power control method and system |
| CN114944659B (en) * | 2022-06-01 | 2023-12-08 | 中国长江三峡集团有限公司 | Automatic control method and system for wind-solar-energy-storage combined power station |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11289664A (en) * | 1998-04-06 | 1999-10-19 | Kansai Electric Power Co Inc:The | Power distribution system control system |
| JPH11289661A (en) * | 1998-04-06 | 1999-10-19 | Kansai Electric Power Co Inc:The | Power flow-calculating device for power distribution system control system |
| CN102801170A (en) * | 2012-08-07 | 2012-11-28 | 广东电网公司中山供电局 | Reactive-voltage control method and system of regional power-grid substations |
| CN102868167A (en) * | 2012-09-11 | 2013-01-09 | 南京中德保护控制系统有限公司 | Reactive voltage control method of photovoltaic power station |
| CN104333008A (en) * | 2014-11-10 | 2015-02-04 | 安徽立卓智能电网科技有限公司 | Reactive voltage control method for improving voltage qualified rate of wind power plant |
| CN104901319A (en) * | 2015-05-13 | 2015-09-09 | 安徽立卓智能电网科技有限公司 | Photovoltaic power plant AVC control method |
| CN105048472A (en) * | 2015-07-08 | 2015-11-11 | 安徽立卓智能电网科技有限公司 | Reactive voltage control method for improving voltage qualified rate of photovoltaic power station |
| CN105075053A (en) * | 2013-02-08 | 2015-11-18 | 日本电气株式会社 | Battery control device, battery control system, battery control method, and recording medium |
| CN105162133A (en) * | 2015-08-24 | 2015-12-16 | 国电南瑞科技股份有限公司 | Reactive power target value allocation method for main transformer of local dispatcher gateway |
-
2015
- 2015-12-23 CN CN201510977308.6A patent/CN105591391B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11289664A (en) * | 1998-04-06 | 1999-10-19 | Kansai Electric Power Co Inc:The | Power distribution system control system |
| JPH11289661A (en) * | 1998-04-06 | 1999-10-19 | Kansai Electric Power Co Inc:The | Power flow-calculating device for power distribution system control system |
| CN102801170A (en) * | 2012-08-07 | 2012-11-28 | 广东电网公司中山供电局 | Reactive-voltage control method and system of regional power-grid substations |
| CN102868167A (en) * | 2012-09-11 | 2013-01-09 | 南京中德保护控制系统有限公司 | Reactive voltage control method of photovoltaic power station |
| CN105075053A (en) * | 2013-02-08 | 2015-11-18 | 日本电气株式会社 | Battery control device, battery control system, battery control method, and recording medium |
| CN104333008A (en) * | 2014-11-10 | 2015-02-04 | 安徽立卓智能电网科技有限公司 | Reactive voltage control method for improving voltage qualified rate of wind power plant |
| CN104901319A (en) * | 2015-05-13 | 2015-09-09 | 安徽立卓智能电网科技有限公司 | Photovoltaic power plant AVC control method |
| CN105048472A (en) * | 2015-07-08 | 2015-11-11 | 安徽立卓智能电网科技有限公司 | Reactive voltage control method for improving voltage qualified rate of photovoltaic power station |
| CN105162133A (en) * | 2015-08-24 | 2015-12-16 | 国电南瑞科技股份有限公司 | Reactive power target value allocation method for main transformer of local dispatcher gateway |
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