CN115912516A - Reactive power coordination control method and device for wind-solar-storage combined power station - Google Patents

Abstract

The invention discloses a reactive power coordination control method and device for a wind-solar-energy storage combined power station, wherein the method comprises the following steps: acquiring a total reactive power regulation instruction and a first reactive power regulation margin of the SVG; distributing according to the total adjusting instruction and the first reactive adjusting margin, and distributing all the total adjusting amount to the SVG when the total adjusting amount is less than or equal to the first reactive adjusting margin; otherwise, preferentially distributing the total adjustment amount to the SVG to enable the first reactive adjustment margin to be zero, and executing the next step; distributing the first reactive surplus regulating quantity according to the reactive power adjustable margins of the stored energy and the wind and light and the distribution priority between the wind and light and the stored energy to respectively obtain the reactive power regulating quantities of the wind and light and the stored energy, and executing the next step if the reactive power regulating quantity of the wind and light is greater than zero; and distributing the wind and photovoltaic reactive power regulating quantity according to a distribution strategy between the wind power and the photovoltaic and the reactive power adjustable margin of the wind power and the photovoltaic to respectively obtain the reactive power regulating quantity of the wind power and the photovoltaic. The invention flexibly coordinates and controls the reactive power according to the actual operation condition.

Description

Reactive power coordination control method and device for wind-solar-energy storage combined power station

Technical Field

The invention relates to the technical field of power systems, in particular to a reactive power coordination control method and device for a wind-solar-storage combined power station.

Background

In recent years, power generation by new energy sources such as wind energy and solar energy is greatly developed, but the wind energy and solar energy power generation has the characteristics of randomness, intermittence, fluctuation and the like, and the technical bottlenecks in prediction, scheduling and control make the independent power generation characteristics and the source network coordination characteristics of the two new energy sources still have larger difference compared with those of a conventional power supply, the large-scale access of a new energy power station causes great influence on the safe and stable operation of a power system, and the reactive coordination control is one of the more common problems in the actual operation.

With the development of large-scale new energy stations, wind-solar-storage combined power stations are a hot trend in the future. In addition, the wind-solar-storage combined power station is also equipped with a dynamic reactive power compensation device (SVG). For a wind-solar-energy-storage combined power station, because various reactive power control devices exist, reactive power coordination control on various power generation equipment is very critical.

When the reactive power coordination control is carried out, the prior art generally considers that wind power, photovoltaic and energy storage are of the same priority, the reactive power coordination control cannot be flexibly carried out according to the actual operation condition of the power system, and the stability, reliability and economy of grid-connected operation of the power system are adversely affected.

Disclosure of Invention

The invention aims to provide a reactive power coordination control method and device of a wind-solar-energy storage combined power station, and aims to solve the technical problem that reactive power coordination control cannot be flexibly performed according to the actual operation condition of a power system in the prior art.

The purpose of the invention can be realized by the following technical scheme:

a reactive power coordination control method of a wind-solar-energy storage combined power station comprises the following steps:

s1: acquiring a total reactive power regulation instruction and a first reactive power regulation margin of a dynamic reactive power compensation device, wherein the total reactive power regulation instruction comprises a total reactive power regulation amount to be regulated and a reactive power regulation direction, and the reactive power regulation direction comprises an up regulation direction and a down regulation direction;

s2: performing first reactive power distribution according to the total reactive power regulation instruction and the first reactive power regulation margin, and when the total reactive power regulation amount is less than or equal to the first reactive power regulation margin, distributing the total reactive power regulation amount to the dynamic reactive power compensation device according to the regulation direction; otherwise, preferentially distributing the total reactive power adjustment amount to the dynamic reactive power compensation device to enable the first reactive power adjustment margin to be zero, and then executing S3;

s3: performing second reactive power distribution on the first reactive power remaining regulating quantity between the wind and light system and the energy storage according to the first distribution priority between the wind and light system and the energy storage, the second reactive power regulating margin of the energy storage, the third reactive power regulating margin of the wind and light system and the regulating direction to respectively obtain the first reactive power regulating quantity of the wind and light system and the second reactive power regulating quantity of the energy storage, and executing S4 if the first reactive power regulating quantity is greater than zero; the first reactive remaining adjustment amount is the difference between the total reactive power adjustment amount and the first reactive power adjustment margin;

s4: and performing third reactive power distribution on the first reactive power regulating quantity between the wind power and the photovoltaic according to a distribution strategy between the wind power and the photovoltaic, a fourth reactive power adjustable margin of the wind power, a fifth reactive power adjustable margin of the photovoltaic and the adjusting direction in the wind and light system to respectively obtain a third reactive power regulating quantity of the wind power and a fourth reactive power regulating quantity of the photovoltaic.

Optionally, the distribution policy between wind power and photovoltaic power in the wind and light system is as follows:

a proportional allocation policy or a priority allocation policy.

Optionally, the proportional allocation policy includes:

and when the adjusting direction is the upward adjusting direction, performing reactive power distribution between the wind power and the photovoltaic according to the maximum reactive power ratio between the wind power and the photovoltaic.

Optionally, the proportional allocation policy includes:

and when the adjusting direction is a downward adjusting direction, distributing the reactive power between the wind power and the photovoltaic according to the proportion of the minimum reactive power between the wind power and the photovoltaic.

Optionally, when the reactive power adjusting direction is an up-adjusting direction, the reactive power adjusting margin of the dynamic reactive power compensation device is a first reactive power up-adjusting margin, otherwise, the reactive power adjusting margin of the dynamic reactive power compensation device is a first reactive power down-adjusting margin.

Optionally, when the reactive power adjusting direction is an up-adjusting direction, the second reactive power adjusting margin for energy storage is a second reactive power up-adjusting margin; and otherwise, the second reactive power regulation margin of the energy storage is the second reactive power regulation margin.

Optionally, before step S2, the method further includes:

when the adjusting direction is an upward adjusting direction, respectively acquiring the current reactive power output and reactive power maximum value of the stored energy, the current reactive power output and reactive power maximum value of the wind power, and the current reactive power output and reactive power maximum value of the photovoltaic;

and when the adjusting direction is a downward adjusting direction, respectively acquiring the current reactive power output and reactive power minimum value of the stored energy, the current reactive power output and reactive power minimum value of the wind power, and the current reactive power output and reactive power minimum value of the photovoltaic.

Optionally, when the reactive power adjustment direction is an upward adjustment direction, the fourth reactive power adjustment margin of the wind power is a difference between the maximum reactive power value of the wind power and the current reactive power output;

otherwise, the fourth reactive power adjustable margin of the wind power is the difference between the current reactive power output of the wind power and the minimum value of the reactive power.

Optionally, when the reactive power adjustment direction is an up-adjustment direction, the fifth reactive power adjustment margin of the photovoltaic is a difference between a maximum reactive power value of the photovoltaic and the current reactive power output;

otherwise, the fifth reactive power adjustable margin of the photovoltaic is the difference between the current reactive power output of the photovoltaic and the minimum value of the reactive power.

The invention also provides a reactive power coordination control device of the wind-solar-energy storage combined power station, which comprises the following components:

the system comprises an initial data acquisition module, a dynamic reactive power compensation device and a control module, wherein the initial data acquisition module is used for acquiring a total reactive power adjustment instruction and a first reactive power adjustment margin of the dynamic reactive power compensation device, the total reactive power adjustment instruction comprises a total reactive power adjustment amount to be adjusted and a reactive power adjustment direction, and the reactive power adjustment direction comprises an up-adjustment direction and a down-adjustment direction;

the first reactive power distribution module is configured to perform first reactive power distribution according to the total reactive power adjustment instruction and the first reactive power adjustment margin, and when the total reactive power adjustment amount is smaller than or equal to the first reactive power adjustment margin, distribute the total reactive power adjustment amount to the dynamic reactive power compensation device according to the adjustment direction; if not, the total reactive power adjustment amount is preferentially distributed to the dynamic reactive power compensation device to enable the first reactive power adjustment margin to be zero, and then a second reactive power distribution module is executed;

the second reactive power distribution module is used for performing second reactive power distribution on the first reactive power residual regulating quantity between the wind and light system and the energy storage according to a first distribution priority between the wind and light system and the energy storage, a second reactive power adjustable margin of the energy storage, a third reactive power adjustable margin of the wind and light system and the adjusting direction to respectively obtain a first reactive power regulating quantity of the wind and light system and a second reactive power regulating quantity of the energy storage, and if the first reactive power regulating quantity is greater than zero, the third reactive power distribution module is executed; the first reactive remaining adjustment amount is the difference between the total reactive power adjustment amount and the first reactive power adjustment margin;

and the third reactive power distribution module is used for performing third reactive power distribution on the first reactive power regulating quantity between the wind power and the photovoltaic according to a distribution strategy between the wind power and the photovoltaic, a fourth reactive power adjustable margin of the wind power, a fifth reactive power adjustable margin of the photovoltaic and the adjusting direction in the wind and photovoltaic system to respectively obtain a third reactive power regulating quantity of the wind power and a fourth reactive power regulating quantity of the photovoltaic.

The invention provides a reactive power coordination control method and device for a wind-solar-energy storage combined power station, wherein the method comprises the following steps: s1: acquiring a total reactive power regulation instruction and a first reactive power regulation margin of a dynamic reactive power compensation device, wherein the total reactive power regulation instruction comprises a total reactive power regulation amount to be regulated and a reactive power regulation direction, and the reactive power regulation direction comprises an up regulation direction and a down regulation direction; s2: performing first reactive power distribution according to the total reactive power regulation instruction and the first reactive power regulation margin, and when the total reactive power regulation amount is less than or equal to the first reactive power regulation margin, distributing the total reactive power regulation amount to the dynamic reactive power compensation device according to the regulation direction; otherwise, preferentially distributing the total reactive power adjustment amount to the dynamic reactive power compensation device to enable the first reactive power adjustment margin to be zero, and then executing S3; s3: performing second reactive power distribution on the first reactive power remaining regulating quantity between the wind and light system and the energy storage according to the first distribution priority between the wind and light system and the energy storage, the second reactive power regulating margin of the energy storage, the third reactive power regulating margin of the wind and light system and the regulating direction to respectively obtain the first reactive power regulating quantity of the wind and light system and the second reactive power regulating quantity of the energy storage, and executing S4 if the first reactive power regulating quantity is greater than zero; the first reactive remaining adjustment amount is the difference between the total reactive power adjustment amount and the first reactive power adjustment margin; s4: and performing third reactive power distribution on the first reactive power regulating quantity between the wind power and the photovoltaic according to a distribution strategy between the wind power and the photovoltaic, a fourth reactive power adjustable margin of the wind power, a fifth reactive power adjustable margin of the photovoltaic and the adjusting direction in the wind and photovoltaic system to respectively obtain a third reactive power regulating quantity of the wind power and a fourth reactive power regulating quantity of the photovoltaic.

Based on the technical scheme, the invention has the following beneficial effects:

according to the method, the total reactive power adjusting amount and the adjusting direction are obtained, the priority of the SVG device is considered to be higher than that of the wind-solar energy storage system, firstly, the total reactive power adjusting amount is preferentially distributed to the SVG device according to the adjustable margin of the SVG device, and the rest reactive power is distributed to the wind-solar energy storage system; and then distributing the reactive residual part between the wind and light system or the energy storage room according to the priority of the wind and light system and the energy storage room, and if the wind and light reactive regulation quantity distributed by the wind and light system is larger than zero, further distributing the wind and light reactive regulation quantity between the wind power and the photovoltaic, and finally respectively obtaining the reactive regulation quantities of the wind power, the photovoltaic and the energy storage. When the reactive power coordination control is carried out, different priorities of the SVG device, the energy storage device, the wind power and the photovoltaic device in the wind-light-storage combined power station are fully considered, and the priority between the wind-light system and the energy storage device and the priority between the wind power and the photovoltaic device are determined according to the actual operation condition of the power system, so that the reactive power coordination control can be flexibly carried out according to the actual operation states of the wind power device, the photovoltaic device, the energy storage device, the SVG device and other devices in the wind-light-storage combined power station, and the stability, the reliability and the economy of grid-connected operation of the power system are facilitated.

Drawings

FIG. 1 is a schematic flow chart of an embodiment of the method of the present invention;

FIG. 2 is a schematic flow chart of another embodiment of the method of the present invention;

fig. 3 is a schematic structural diagram of an embodiment of the present invention.

Detailed Description

The embodiment of the invention provides a reactive power coordination control method and device of a wind-solar-energy storage combined power station, and aims to solve the technical problem that reactive power coordination control cannot be flexibly carried out according to the actual operation condition of a power system in the prior art.

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Wind energy and solar energy are representative new energy, and are widely applied along with the construction of a new power system mainly using the new energy. However, both wind power generation and photovoltaic power generation have the characteristics of randomness and intermittency, and the technical bottlenecks in prediction, scheduling and control of the wind power generation and the photovoltaic power generation make the independent power generation characteristics and the source network coordination characteristics of the two new energy sources still have larger differences compared with those of a conventional power source, and the chemical energy storage device can effectively solve the problem. Therefore, the wind-solar-storage combined power station can be constructed by utilizing the complementarity between wind-solar-storage, and the stability and the economy of grid-connected operation of the wind-solar-storage combined power station are improved. In addition, the wind-solar-storage combined power station is usually equipped with a dynamic reactive power compensation device (SVG). Because a wind-solar-energy-storage combined power station is provided with a plurality of reactive power control devices, a key problem to be considered is reactive power coordination control of a plurality of power generation devices.

Referring to fig. 1, an embodiment of a reactive power coordination control method for a wind-solar-energy storage combined power plant provided by the invention includes:

s100: acquiring a total reactive power regulation instruction and a first reactive power regulation margin of a dynamic reactive power compensation device, wherein the total reactive power regulation instruction comprises a total reactive power regulation amount to be regulated and a reactive power regulation direction, and the reactive power regulation direction comprises an up regulation direction and a down regulation direction;

s200: performing first reactive power distribution according to the total reactive power regulation instruction and the first reactive power regulation margin, and when the total reactive power regulation amount is less than or equal to the first reactive power regulation margin, distributing the total reactive power regulation amount to the dynamic reactive power compensation device according to the regulation direction; otherwise, preferentially distributing the total reactive power adjustment amount to the dynamic reactive power compensation device to enable the first reactive power adjustment margin to be zero, and then executing S300;

s300: performing second reactive power distribution on the first reactive power remaining regulating quantity between the wind and light system and the energy storage according to the first distribution priority between the wind and light system and the energy storage, the second reactive power regulating margin of the energy storage, the third reactive power regulating margin of the wind and light system and the regulating direction to respectively obtain the first reactive power regulating quantity of the wind and light system and the second reactive power regulating quantity of the energy storage, and executing S400 if the first reactive power regulating quantity is greater than zero; the first reactive remaining adjustment amount is the difference between the total reactive power adjustment amount and the first reactive power adjustment margin;

s400: and performing third reactive power distribution on the first reactive power regulating quantity between the wind power and the photovoltaic according to a distribution strategy between the wind power and the photovoltaic, a fourth reactive power adjustable margin of the wind power, a fifth reactive power adjustable margin of the photovoltaic and the adjusting direction in the wind and photovoltaic system to respectively obtain a third reactive power regulating quantity of the wind power and a fourth reactive power regulating quantity of the photovoltaic.

In step S100, the wind, photovoltaic and energy storage combined power plant first obtains a total reactive power adjustment command and a first reactive power adjustment margin of the dynamic reactive power compensation device; the reactive power regulation total instruction comprises a reactive power regulation total amount to be regulated and a reactive power regulation direction, and the reactive power regulation direction comprises an up regulation direction and a down regulation direction.

It is understood that the first reactive power margin of the dynamic reactive power compensation device is the first reactive power margin when the reactive power adjusting direction is the up-adjusting direction, otherwise the first reactive power margin of the dynamic reactive power compensation device is the first reactive power margin.

In step S100, the process of obtaining the first reactive power adjusting margin of the dynamic reactive power compensation device is as follows: when the adjusting direction is upward adjustment, the maximum reactive power value and the current reactive power output of the dynamic reactive power compensation device need to be acquired, and the first reactive power adjustable margin is the difference between the maximum reactive power value and the current reactive power output; when the adjusting direction is down-regulation, the reactive power minimum value and the current reactive power output of the dynamic reactive power compensation device need to be acquired, and the first reactive power adjustable margin is the difference between the current reactive power output and the reactive power minimum value.

Before executing the step S200, when the adjusting direction is the upward adjusting direction, respectively acquiring the current reactive power output and the maximum reactive power value of the stored energy, the current reactive power output and the maximum reactive power value of the wind power, and the current reactive power output and the maximum reactive power value of the photovoltaic power; and when the adjusting direction is a downward adjusting direction, respectively acquiring the current reactive power output and reactive power minimum value of the stored energy, the current reactive power output and reactive power minimum value of the wind power, and the current reactive power output and reactive power minimum value of the photovoltaic. So as to calculate the reactive up-regulation margin of the stored energy,

before step S200 is executed, reactive power adjustable margins of energy storage, wind power and photovoltaic are respectively calculated, specifically, when the adjusting direction is an up-adjusting direction, the reactive power adjustable margins of energy storage, wind power and photovoltaic are respectively obtained, and when the adjusting direction is a down-adjusting direction, the reactive power adjustable margins of energy storage, wind power and photovoltaic are respectively obtained. For example, when the adjustment direction is the up-adjustment direction, only the fourth reactive power up-adjustment margin of the wind power needs to be acquired, and the maximum reactive power value and the current reactive power output of the wind power are acquired, where the fourth reactive power up-adjustment margin of the wind power is the difference between the maximum reactive power value and the current reactive power output of the wind power. When the adjusting direction is the down-adjusting direction, only the fourth reactive power down-adjusting margin of the wind power needs to be acquired, the reactive power minimum value and the current reactive power output of the wind power are acquired, and the fourth reactive power down-adjusting margin of the wind power is the difference between the current reactive power output and the reactive power minimum value of the wind power. The calculation methods of the second reactive power adjustable margin of energy storage and the fifth reactive power adjustable margin of photovoltaic are similar to those of wind power, and are not described herein again.

In step S200, performing a first reactive power distribution according to the total reactive power adjustment command and the first reactive power adjustment margin, and when the total reactive power adjustment amount is less than or equal to the first reactive power adjustment margin, distributing all the total reactive power adjustment amount to the dynamic reactive power compensation device; otherwise, the total reactive power adjustment amount is preferentially allocated to the dynamic reactive power compensation device to make the first reactive power adjustment margin zero, and then S300 is performed.

In the embodiment, the reactive power is preferentially distributed according to the first reactive power adjustable margin of the dynamic reactive power compensation device (SVG device), when the total reactive power adjustable amount is less than or equal to the first reactive power adjustable margin of the SVG device, only the SVG reactive power adjusting instruction is issued to the SVG device, the total reactive power adjustable amount is completely distributed to the SVG device, namely, the reactive power is distributed to the SVG device only at the moment, the reactive power does not need to be distributed to the wind-solar energy storage system, and the reactive power distribution is finished.

When the total reactive power adjustment amount is larger than the first reactive power adjustment margin of the SVG device, firstly, a full-sending instruction is issued to the SVG device, the total reactive power adjustment amount is preferentially distributed to the dynamic reactive power compensation device to enable the first reactive power adjustment margin to be zero, then, the subsequent steps are executed, and the rest part, namely the first reactive power remaining adjustment amount is distributed among the three parts of the wind, light and storage system. It is understood that the first reactive surplus adjusting amount is the difference between the total reactive power adjusting amount and the first reactive power adjusting margin.

It should be noted that when the total reactive power adjustment amount is greater than the first reactive power adjustment margin of the SVG device, a full-sending instruction is issued to the SVG device, that is, the reactive power with the amount equivalent to the first reactive power adjustment margin is taken out from the total reactive power adjustment amount and distributed to the SVG device, so that the first reactive power adjustment margin of the SVG device is zero after the first reactive power distribution. When the reactive power adjusting direction is the upward adjusting direction, the reactive power of the SVG device reaches the maximum value of the reactive power after the first reactive power distribution; and when the reactive power adjusting direction is the down-regulation direction, the reactive power of the SVG device after the first reactive power distribution is the minimum value of the reactive power.

It should be noted that the adjustable margin of the wind-solar energy storage system is the sum of the adjustable margins of the energy storage system, the wind power system and the photovoltaic system.

In step S300, performing second reactive power distribution on the first reactive power remaining regulating quantity between the wind and light system and the energy storage according to the first distribution priority between the wind and light system and the energy storage, the second reactive power regulating margin of the energy storage, the third reactive power regulating margin of the wind and light system and the regulating direction to respectively obtain the first reactive power regulating quantity of the wind and light system and the second reactive power regulating quantity of the energy storage, and executing S4 if the first reactive power regulating quantity is greater than zero; and the first reactive residual regulating quantity is the difference between the total reactive power regulating quantity and the first reactive power regulating margin.

In this embodiment, the second reactive power adjustable margin of the stored energy is a second reactive power up-regulation margin (during up-regulation) or a second reactive power down-regulation margin (during down-regulation), and the third reactive power adjustable margin of the wind and light system is a third reactive power up-regulation margin (during up-regulation) or a third reactive power down-regulation margin (during down-regulation). The second reactive power up-regulation margin is the difference between the maximum value of the stored reactive power and the current reactive power output, and the second reactive power down-regulation margin is the difference between the current reactive power output of the stored energy and the minimum value of the reactive power; the third reactive power up-regulation margin is the difference between the maximum reactive power value of the wind and light system and the current reactive power output, and the third reactive power down-regulation margin is the difference between the current reactive power output of the wind and light system and the minimum reactive power value.

In the second reactive power distribution, the wind-solar-energy storage combined power station forms a power control instruction of a wind-solar system and a power control instruction of an energy storage device according to a wind-solar-energy and energy storage distribution strategy, and obtains a first reactive power regulating quantity of the wind-solar system and a second reactive power regulating quantity of the energy storage device respectively.

The wind-solar-energy-storage combined power station determines a reactive power distribution strategy of a wind-solar system and energy storage according to the priority between the wind-solar system and the energy storage: when energy storage is prior, only adjusting the reactive power output of the energy storage when the energy storage has reactive power adjustable margin, and adjusting the reactive power output of the wind and light system when the energy storage has no reactive power adjustable margin; when the wind and light system has priority, the reactive power output of the wind and light system is only adjusted when the wind and light system has reactive power adjustable margin, and the reactive power output of the stored energy is adjusted when the wind and light system does not have reactive power adjustable margin.

When the first distribution priority between the wind and light system and the energy storage is energy storage priority and the adjusting direction is an up-adjusting direction, the second reactive power adjustable margin is a second reactive power up-adjusting margin at the moment, the first reactive power residual adjusting quantity is compared with the second reactive power up-adjusting margin, if the first reactive power residual adjusting quantity is less than or equal to the second reactive power up-adjusting margin, the stored reactive power up-adjusting margin is sufficient, so that only the reactive power output of the energy storage is needed to be adjusted, the reactive power output of the wind and light system is not needed to be adjusted, at the moment, the second reactive power adjusting quantity of the energy storage is equal to the first reactive power residual adjusting quantity, and the first reactive adjusting quantity of the wind and light system is zero; and if not, indicating that the energy storage does not have enough reactive power up-regulation margin, preferentially distributing the first reactive power surplus regulation quantity to the energy storage to enable the second reactive power up-regulation margin to be zero, and then regulating the reactive power output of the wind and light system, wherein at the moment, the second reactive power regulation quantity of the energy storage is equal to the second reactive power up-regulation margin, and the first reactive power regulation quantity of the wind and light system is the difference between the first reactive power surplus regulation quantity and the second reactive power up-regulation margin.

If the energy storage is prior and the adjusting direction is the down-adjusting direction, the second reactive power adjusting margin is the second reactive power adjusting margin, the first reactive power remaining adjusting quantity is compared with the second reactive power adjusting margin, if the first reactive power remaining adjusting quantity is smaller than or equal to the second reactive power adjusting margin, the stored reactive power adjusting margin is sufficient, therefore, only the reactive power output of the energy storage needs to be adjusted, the reactive power output of the wind and light system does not need to be adjusted, at the moment, the second reactive power adjusting quantity of the energy storage is equal to the first reactive power remaining adjusting quantity, and the first reactive power adjusting quantity of the wind and light system is zero; and if not, indicating that the stored energy does not have enough reactive power down-regulation margin, preferentially distributing the first reactive power remaining regulation amount to the stored energy to enable the second reactive power down-regulation margin to be zero, and then regulating the reactive power output of the wind and light system, wherein at the moment, the second reactive power regulation amount of the stored energy is equal to the second reactive power down-regulation margin, and the first reactive power regulation amount of the wind and light system is the difference between the first reactive power remaining regulation amount and the second reactive power down-regulation margin.

When the first distribution priority between the wind and light system and the energy storage is the priority of the wind and light system, the situation of reactive power distribution is similar to the priority of the energy storage, and details are not repeated here.

In step S400, third reactive power distribution is performed on the first reactive power adjustment amount between the wind power and the photovoltaic power according to a distribution strategy between the wind power and the photovoltaic power in the wind/solar system, a fourth reactive power adjustment margin of the wind power, a fifth reactive power adjustment margin of the photovoltaic power, and an adjustment direction, so as to obtain a third reactive power adjustment amount of the wind power and a fourth reactive power adjustment amount of the photovoltaic power, respectively.

According to the distribution strategy between wind power and photovoltaic in the wind-solar system, the method comprises the following steps: a proportional allocation policy or a priority allocation policy. Wherein, the proportion allocation strategy comprises: and distributing the reactive power between the wind power and the photovoltaic according to the proportion of the maximum value or the minimum value of the reactive power between the wind power and the photovoltaic. The proportion distribution can be set according to the field requirements, and if the wind and light output are the same, the proportion distribution is carried out according to the upper and lower limit proportion of the unit; for example, the maximum value (upper limit) of the reactive power of the wind turbine generator is 60MVar, the minimum value (lower limit) is 20MVar, the maximum value (upper limit) of the reactive power of the photovoltaic is 40MVar, the minimum value (lower limit) is 10MVar, and when the reactive power needs to be adjusted up, the maximum ratio of the reactive power of the wind turbine generator and the photovoltaic is 60; when the reactive power needs to be adjusted downwards, the proportion of the minimum reactive power of the wind power and the photovoltaic distribution is 20.

And for priority distribution strategies, the method is divided into wind power priority and photovoltaic priority. When the wind power is prior, only the reactive power output of the wind power is adjusted when the wind power has an adjustable margin, and the reactive power output of the photovoltaic is adjusted when the wind power has no adjustable margin; and when the photovoltaic is preferential, only the reactive power output of the photovoltaic is adjusted when the photovoltaic has the adjustable margin, and the reactive power output of the wind power is adjusted when the photovoltaic does not have the adjustable margin.

It should be noted that the wind-solar-energy storage hybrid power station selects one (alternative) of two allocation strategies such as proportion allocation and priority allocation according to application requirements. When the area of the wind-solar-energy storage hybrid power station (new energy power station) is full of wind power and photovoltaic resources, a proportional allocation strategy can be selected according to actual conditions; when certain resource in wind power and photovoltaic has a large ratio of resources, a priority allocation strategy can be selected. For example, when the daylight is sufficiently lit and the wind speed is not high, photovoltaic preference may be selected; when the day is cloudy and the wind speed is high, the wind power can be selected to be prior; when the light is weak and only the wind exists at night, the wind power can be selected to be prior.

In the third reactive power distribution, the wind-solar-energy storage combined power station forms power control instructions of the wind generation set and the photovoltaic generation set according to a reactive power distribution strategy between wind generation and photovoltaic, namely reactive power control instructions (including reactive power regulating quantity and regulating direction) of the three devices of wind generation, photovoltaic and energy storage are finally formed.

According to the reactive power coordination control method of the wind-solar-storage combined power station, the priority of the SVG device is considered to be higher than that of the wind-solar-storage system by acquiring the reactive power regulation total amount and the regulation direction, firstly, the reactive power regulation total amount is preferentially distributed to the SVG device according to the regulation margin of the SVG device, and the reactive power residual part is distributed to the wind-solar-storage system; and then distributing the reactive residual part between the wind and light system or the energy storage room according to the priority of the wind and light system and the energy storage room, and if the wind and light reactive regulation quantity distributed by the wind and light system is larger than zero, further distributing the wind and light reactive regulation quantity between the wind power and the photovoltaic, and finally respectively obtaining the reactive regulation quantities of the wind power, the photovoltaic and the energy storage. When the reactive power coordination control is carried out, different priorities of the SVG device, the energy storage device, the wind power and the photovoltaic device in the wind-light-storage combined power station are fully considered, and the priority between the wind-light system and the energy storage device and the priority between the wind power and the photovoltaic device are determined according to the actual operation condition of the power system, so that the reactive power coordination control can be flexibly carried out according to the actual operation states of the wind power device, the photovoltaic device, the energy storage device, the SVG device and other devices in the wind-light-storage combined power station, and the stability, the reliability and the economy of grid-connected operation of the power system are facilitated.

Referring to fig. 2, the present invention further provides another embodiment of a reactive power coordination control method for a wind-solar-energy storage combined power plant, including:

1) The wind-solar-storage combined power station acquires a total reactive power regulation instruction (including total reactive power regulation amount and reactive power regulation direction), and acquires the current reactive power output and maximum or minimum reactive power of the SVG device, wind, light and storage in the power station, so that reactive power up-regulation margin or reactive power down-regulation margin of the SVG device, wind, light and storage is calculated and obtained respectively.

It should be noted that when the reactive power regulation direction is the up-regulation direction, the reactive power up-regulation margin of the corresponding device can be obtained only by collecting the SVG device, the wind, the light, the stored current reactive power output and the maximum value of the reactive power; when the reactive power regulation direction is the down regulation direction, the reactive power down regulation margin of the corresponding device can be obtained only by collecting the SVG device, wind, light, the stored current reactive power output and the reactive power minimum value.

Preferentially distributing according to the reactive power adjustable margin of the SVG device, namely distributing reactive power to the SVG device only when the reactive power adjusting instruction is smaller than the adjustable margin of the SVG device; and when the reactive power adjusting instruction is larger than the adjustable margin of the SVG device, the SVG device is fully started, the rest part of the SVG device is distributed by the wind, the solar and the photovoltaic storage, and a follow-up strategy is executed. And finally obtaining the SVG reactive power control instruction and the wind-solar energy storage reactive power control instruction.

2) The wind, light and energy storage combined power station selects a wind, light and energy storage distribution strategy according to the wind, light and energy storage reactive power regulation instruction: when energy storage is prior, only adjusting the energy storage reactive power output when the energy storage has adjustable margin, and adjusting the wind-solar reactive power output when the energy storage has no adjustable margin; when wind and light have priority, only wind and light reactive power output is adjusted when the wind and light have adjustable margin, and energy storage reactive power output is adjusted when the wind and light have no adjustable margin.

3) The wind-light-storage combined power station forms a power control instruction of an energy storage device and a power control instruction of a wind-light system according to a wind-light and energy storage distribution strategy.

4) And calculating a power control instruction of the wind-light-storage combined power station according to the previous steps, and simultaneously acquiring actual power, a reactive maximum value, a minimum value (existing in 1, can be deleted) and the like of wind and light in the power station.

5) The wind-solar-energy storage hybrid power station selects one (two-to-one) of two distribution strategies such as proportion distribution, priority distribution and the like according to application requirements.

6) And for the proportion distribution strategy, the proportion is distributed according to wind and light reactive upper and lower limits (maximum and minimum values).

7) The priority allocation strategy is divided into wind priority and light priority. When wind has priority, only adjusting wind reactive power output when the wind has adjustable margin, and adjusting light reactive power output when the wind has no adjustable margin; when the light has priority, only the light reactive power is adjusted when the light has the adjustable margin, and the wind reactive power is adjusted when the light has no adjustable margin.

8) The wind-solar-energy-storage combined power station forms reactive power control instructions of the wind turbine generator and the photovoltaic turbine generator according to a wind and light distribution strategy, namely reactive power control instructions of the wind turbine generator, the photovoltaic generator and the energy storage device are finally formed.

Referring to fig. 3, the present invention further provides an embodiment of a reactive power coordination control apparatus of a wind-solar-energy storage combined power plant, including:

the initial data acquisition module 11 is configured to acquire a total reactive power adjustment instruction and a first reactive power adjustment margin of the dynamic reactive power compensation device, where the total reactive power adjustment instruction includes a total reactive power adjustment amount to be adjusted and a reactive power adjustment direction, and the reactive power adjustment direction includes an up-adjustment direction and a down-adjustment direction;

a first reactive power allocation module 22, configured to perform first reactive power allocation according to the total reactive power adjustment instruction and the first reactive power adjustment margin, and when the total reactive power adjustment amount is smaller than or equal to the first reactive power adjustment margin, allocate all of the total reactive power adjustment amount to the dynamic reactive power compensation device according to the adjustment direction; if not, the total reactive power adjustment amount is preferentially distributed to the dynamic reactive power compensation device to enable the first reactive power adjustment margin to be zero, and then a second reactive power distribution module is executed;

the second reactive power distribution module 33 is configured to perform second reactive power distribution on the first reactive remaining adjustment amount between the wind and light system and the energy storage according to a first distribution priority between the wind and light system and the energy storage, a second reactive power adjustable margin of the energy storage, a third reactive power adjustable margin of the wind and light system, and the adjustment direction, to obtain the first reactive adjustment amount of the wind and light system and the second reactive adjustment amount of the energy storage respectively, and if the first reactive adjustment amount is greater than zero, execute the third reactive power distribution module; the first reactive remaining adjustment amount is the difference between the total reactive power adjustment amount and the first reactive power adjustment margin;

a third reactive power distribution module 44, configured to perform third reactive power distribution on the first reactive power regulating quantity between the wind power and the photovoltaic power according to the distribution policy between the wind power and the photovoltaic power in the wind/photovoltaic power system, the fourth reactive power adjustable margin of the wind power, the fifth reactive power adjustable margin of the photovoltaic power, and the adjusting direction, to obtain a third reactive power regulating quantity of the wind power and a fourth reactive power regulating quantity of the photovoltaic power, respectively

According to the embodiment, reactive power is distributed according to SVG and wind-light storage, then the wind-light storage is used for adjusting reactive power output according to wind-light and storage, and finally the wind-light pair is used for adjusting reactive power output with wind priority and light priority. The invention can flexibly carry out reactive coordination control on various devices such as wind power, photovoltaic, energy storage, SVG and the like in the wind-solar-energy storage combined power station.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or electrical connection may be through some interfaces, indirect coupling or electrical connection of devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A reactive power coordination control method of a wind-solar-energy storage combined power station is characterized by comprising the following steps:

s1: acquiring a reactive power regulation total instruction and a first reactive power regulation margin of a dynamic reactive power compensation device, wherein the reactive power regulation total instruction comprises a reactive power regulation total amount to be regulated and a reactive power regulation direction, and the reactive power regulation direction comprises an up regulation direction and a down regulation direction;

s2: performing first reactive power distribution according to the total reactive power regulation instruction and the first reactive power regulation margin, and when the total reactive power regulation amount is less than or equal to the first reactive power regulation margin, distributing the total reactive power regulation amount to the dynamic reactive power compensation device according to the regulation direction; otherwise, preferentially distributing the total reactive power adjustment amount to the dynamic reactive power compensation device to enable the first reactive power adjustment margin to be zero, and then executing S3;

s3: performing second reactive power distribution on the first reactive power remaining regulating quantity between the wind and light system and the energy storage according to the first distribution priority between the wind and light system and the energy storage, the second reactive power regulating margin of the energy storage, the third reactive power regulating margin of the wind and light system and the regulating direction to respectively obtain the first reactive power regulating quantity of the wind and light system and the second reactive power regulating quantity of the energy storage, and executing S4 if the first reactive power regulating quantity is greater than zero; the first reactive residual regulating quantity is the difference between the total reactive power regulating quantity and the first reactive power regulating margin;

s4: and performing third reactive power distribution on the first reactive power regulating quantity between the wind power and the photovoltaic according to a distribution strategy between the wind power and the photovoltaic, a fourth reactive power adjustable margin of the wind power, a fifth reactive power adjustable margin of the photovoltaic and the adjusting direction in the wind and photovoltaic system to respectively obtain a third reactive power regulating quantity of the wind power and a fourth reactive power regulating quantity of the photovoltaic.

2. The reactive power coordination control method of the wind, light and storage combined power plant according to claim 1, characterized in that the distribution strategy between wind power and photovoltaic in the wind and light system is as follows:

a proportional allocation policy or a priority allocation policy.

3. The reactive power coordinated control method of a wind, light and storage combined power plant according to claim 2, characterized in that the proportional distribution strategy comprises:

and when the adjusting direction is the upward adjusting direction, performing reactive power distribution between the wind power and the photovoltaic according to the maximum reactive power ratio between the wind power and the photovoltaic.

4. The reactive power coordinated control method of the wind-solar-energy-storage combined power plant according to claim 2, characterized in that the proportional allocation strategy comprises:

and when the adjusting direction is a downward adjusting direction, distributing the reactive power between the wind power and the photovoltaic according to the reactive power minimum value proportion between the wind power and the photovoltaic.

5. The reactive power coordinated control method of the wind, light and storage combined power plant according to claim 1, characterized in that when the reactive power regulation direction is an up regulation direction, the reactive power regulation margin of the dynamic reactive power compensation device is a first reactive power up regulation margin, otherwise, the reactive power regulation margin of the dynamic reactive power compensation device is a first reactive power down regulation margin.

6. The reactive power coordinated control method of the wind, light and energy storage combined power plant according to claim 1, wherein when the reactive power regulation direction is an up regulation direction, the second reactive power regulation margin of energy storage is a second reactive power up regulation margin; and otherwise, the second reactive power regulation margin of the energy storage is the second reactive power regulation margin.

7. The reactive power coordinated control method of the wind, light and storage combined power plant according to claim 1, characterized by further comprising, before step S2:

when the adjusting direction is an upward adjusting direction, respectively acquiring the current reactive power output and reactive power maximum value of the stored energy, the current reactive power output and reactive power maximum value of the wind power, and the current reactive power output and reactive power maximum value of the photovoltaic;

and when the adjusting direction is a downward adjusting direction, respectively acquiring the current reactive power output and reactive power minimum value of the stored energy, the current reactive power output and reactive power minimum value of the wind power, and the current reactive power output and reactive power minimum value of the photovoltaic.

8. The reactive power coordination control method of a wind, light and storage combined power plant according to claim 1, characterized in that when the reactive power regulation direction is up regulation, the fourth reactive power regulation margin of the wind power is a difference between a maximum reactive power value of the wind power and a current reactive power output;

otherwise, the fourth reactive power adjustable margin of the wind power is the difference between the current reactive power output of the wind power and the minimum value of the reactive power.

9. The reactive power coordinated control method of the wind, light and storage combined power plant according to claim 1, wherein when the reactive power regulation direction is an up regulation direction, the fifth reactive power regulation margin of the photovoltaic is a difference between a maximum value of the reactive power of the photovoltaic and a current reactive power output;

otherwise, the fifth reactive power adjustable margin of the photovoltaic is the difference between the current reactive power output and the minimum value of the reactive power of the photovoltaic.

10. A reactive power coordination control device of a wind-solar-energy storage combined power station is characterized by comprising:

the system comprises an initial data acquisition module, a dynamic reactive power compensation device and a control module, wherein the initial data acquisition module is used for acquiring a total reactive power adjustment instruction and a first reactive power adjustment margin of the dynamic reactive power compensation device, the total reactive power adjustment instruction comprises a total reactive power adjustment amount to be adjusted and a reactive power adjustment direction, and the reactive power adjustment direction comprises an up-adjustment direction and a down-adjustment direction;

the first reactive power distribution module is configured to perform first reactive power distribution according to the total reactive power adjustment instruction and the first reactive power adjustment margin, and when the total reactive power adjustment amount is smaller than or equal to the first reactive power adjustment margin, distribute the total reactive power adjustment amount to the dynamic reactive power compensation device according to the adjustment direction; if not, the total reactive power adjustment amount is preferentially distributed to the dynamic reactive power compensation device to enable the first reactive power adjustment margin to be zero, and then a second reactive power distribution module is executed;

the second reactive power distribution module is used for performing second reactive power distribution on the first reactive power residual regulating quantity between the wind and light system and the energy storage according to the first distribution priority between the wind and light system and the energy storage, the second reactive power adjustable margin of the energy storage, the third reactive power adjustable margin of the wind and light system and the adjusting direction to respectively obtain the first reactive power regulating quantity of the wind and light system and the second reactive power regulating quantity of the energy storage, and if the first reactive power regulating quantity is larger than zero, the third reactive power distribution module is executed; the first reactive remaining adjustment amount is the difference between the total reactive power adjustment amount and the first reactive power adjustment margin;

and the third reactive power distribution module is used for performing third reactive power distribution on the first reactive power regulating quantity between the wind power and the photovoltaic according to a distribution strategy between the wind power and the photovoltaic, a fourth reactive power adjustable margin of the wind power, a fifth reactive power adjustable margin of the photovoltaic and the adjusting direction in the wind and photovoltaic system to respectively obtain a third reactive power regulating quantity of the wind power and a fourth reactive power regulating quantity of the photovoltaic.

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