A method, device and equipment for configuring reactive compensation capacity of a wind-solar storage station

Abstract

The present invention discloses a method, device, and equipment for configuring the reactive compensation capacity of a wind, solar, and energy storage station. The method includes: calculating the maximum energy storage active power and the maximum wind power active power under different photovoltaic active power conditions; calculating the station reactive loss and station reactive power corresponding to each photovoltaic active power condition based on the photovoltaic active power, maximum energy storage active power, and maximum wind power active power of each photovoltaic active power condition; determining the reactive compensation demand under each photovoltaic active power condition using the difference between the station reactive loss and the station reactive power; and determining the reactive compensation capacity using the maximum reactive compensation demand among the reactive compensation demands under each photovoltaic active power condition, so as to configure the idle capacity of the energy storage area according to the reactive compensation capacity. The technical solution provided by the present invention improves the accuracy of reactive compensation capacity configuration of wind, solar, and energy storage stations.

Description

Technical Field

[0001] The present invention relates to the field of power compensation, and in particular to a method, device and equipment for configuring reactive power compensation capacity of a wind-solar-storage station. Background Art

[0002] At present, wind power, photovoltaic and other new energy sites need to be equipped with sufficient reactive power compensation devices to meet the power factor requirements. At the same time, many places stipulate that new energy sites must be equipped with a certain proportion of energy storage to smooth out the randomness and volatility of renewable energy power generation output. As a high-quality regulation resource, energy storage can assist in reactive power regulation while regulating active power output. Reactive power regulation by energy storage is mainly achieved through the power conversion system (PCS). Without affecting the active power output of the system, it can use the idle capacity of energy storage to provide a certain amount of reactive power support, thereby reducing the need for reactive power compensation devices in power stations, saving corresponding investment, improving the economic efficiency of the project, and reducing the electricity cost of the entire society. However, there is no accurate configuration method for how much reactive power compensation capacity should be provided. Summary of the Invention

[0003] In view of this, the embodiments of the present invention provide a method, device and equipment for configuring the reactive compensation capacity of a wind-solar-storage station, which improves the accuracy of the reactive compensation capacity configuration of the wind-solar-storage station.

[0004] According to a first aspect, the present invention provides a method for configuring the reactive compensation capacity of a wind-solar-storage station, the method comprising: calculating the maximum energy storage active power and the maximum wind power active power under different photovoltaic actual active power conditions; calculating the station reactive loss and station reactive power corresponding to each photovoltaic actual active power condition based on the photovoltaic actual active power, the maximum energy storage active power and the maximum wind power active power of each photovoltaic actual active power condition; determining the reactive compensation demand under each photovoltaic actual active power condition by using the difference between the station reactive loss and the station reactive power under each photovoltaic actual active power condition; determining the reactive compensation capacity by using the maximum reactive compensation demand among the reactive compensation demands under each photovoltaic actual active power condition, so as to configure the idle capacity of the energy storage area according to the reactive compensation capacity.

[0005] Optionally, the maximum energy storage active power under different photovoltaic active power conditions is calculated, including: obtaining photovoltaic rated active power, wind power rated active power and energy storage rated active power; determining the maximum active power of the station based on the sum of the photovoltaic rated active power and the wind power rated active power; taking values from the photovoltaic rated active power at preset proportional intervals to obtain multiple different photovoltaic active powers; using the difference between the station maximum active power and the current photovoltaic active power to determine the current energy storage allowable active power, the current energy storage allowable active power represents the maximum active power that the station is currently allowed to generate by the energy storage; determining the current maximum energy storage active power corresponding to the current photovoltaic active power based on the smaller value of the current energy storage allowable active power and the energy storage rated active power.

[0006] Optionally, the maximum wind power active power under different photovoltaic active power conditions is calculated, including: using the difference between the maximum active power of the site, the current photovoltaic active power and the current maximum energy storage active power to determine the current allowable wind power active power, the current allowable wind power active power represents the maximum active power currently allowed for wind power generation by the site; based on the smaller value of the current allowable wind power active power and the wind power rated active power, determining the current maximum wind power active power corresponding to the current photovoltaic active power.

[0007] Optionally, when calculating the station reactive loss and station reactive power corresponding to each photovoltaic active power condition, the voltage value used in the calculation is a voltage value obtained by reducing the station rated voltage by a preset multiple.

[0008] Optionally, the preset multiple is 0.97 times.

[0009] Optionally, the reactive loss of the station corresponding to each photovoltaic actual active power condition is calculated based on the photovoltaic actual active power, maximum energy storage active power and maximum wind power active power of each photovoltaic actual active power condition, including: calculating the wind farm area reactive loss, photovoltaic area reactive loss, energy storage area reactive loss, boost transformer reactive loss and transmission line reactive loss corresponding to each photovoltaic actual active power condition based on the photovoltaic actual active power, maximum energy storage active power and maximum wind power active power of each photovoltaic actual active power condition; calculating the sum of the wind farm area reactive loss, photovoltaic area reactive loss, energy storage area reactive loss, boost transformer reactive loss and transmission line reactive loss corresponding to each photovoltaic actual active power condition as the station reactive loss corresponding to each photovoltaic actual active power condition.

[0010] Optionally, the reactive loss of the wind farm area includes the reactive loss of the wind turbine to box transformer line, the reactive loss of the wind turbine box transformer and the reactive loss of the wind farm area collection line; the reactive loss of the photovoltaic area includes the reactive loss of the photovoltaic inverter to box transformer line, the reactive loss of the photovoltaic box transformer and the reactive loss of the photovoltaic area collection line; the reactive loss of the energy storage area includes the reactive loss of the energy storage converter to box transformer line, the reactive loss of the energy storage box transformer and the reactive loss of the energy storage area collection line.

[0011] According to the second aspect, an embodiment of the present invention provides a reactive compensation capacity configuration device for a wind-solar-storage station, the device comprising: a maximum active power determination module, used to calculate the maximum energy storage active power and the maximum wind power active power under different photovoltaic actual active power conditions; a station reactive power calculation module, used to calculate the station reactive loss and station reactive power corresponding to each photovoltaic actual active power condition based on the photovoltaic actual active power, the maximum energy storage active power and the maximum wind power active power of each photovoltaic actual active power condition; a reactive compensation demand calculation module, used to determine the reactive compensation demand under each photovoltaic actual active power condition by using the difference between the station reactive loss and the station reactive power under each photovoltaic actual active power condition; a reactive compensation capacity configuration module, used to determine the reactive compensation capacity by using the maximum reactive compensation demand among the reactive compensation demands under each photovoltaic actual active power condition, so as to configure the idle capacity of the energy storage area according to the reactive compensation capacity.

[0012] According to the third aspect, an embodiment of the present invention provides a reactive compensation capacity configuration device for a wind-solar-storage station, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to execute the method described in the first aspect, or any optional embodiment of the first aspect.

[0013] According to a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method described in the first aspect or any optional embodiment of the first aspect.

[0014] The technical solution provided by this application has the following advantages:

[0015] The technical solution provided in this application uses photovoltaic active power as the independent variable to calculate the maximum energy storage active power and the maximum wind power active power under different photovoltaic active power conditions; then, based on the photovoltaic active power, maximum energy storage active power and maximum wind power active power of each photovoltaic active power condition, the station reactive loss and station reactive power corresponding to each photovoltaic active power condition are calculated; then, under each photovoltaic active power condition, the difference between the station reactive loss and the station reactive power is calculated to obtain the reactive compensation demand under each photovoltaic active power condition; finally, the reactive compensation capacity is determined based on the maximum reactive compensation demand. The determined reactive compensation capacity is used to configure the idle energy storage capacity, so that the reactive loss generated by the wind, solar and storage station under any output condition can be compensated by the configured idle energy storage capacity. While meeting the power factor of the wind, solar and storage station, the idle capacity of the energy storage system is fully utilized to provide reactive support, reducing the need for the construction of reactive compensation devices in wind, solar and storage power stations, reducing the total investment in power stations, improving the economic efficiency of the project, and reducing social electricity costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0017] Figure 1 A schematic diagram showing the steps of a method for configuring reactive compensation capacity of a wind-solar-storage station in one embodiment of the present invention is shown;

[0018] Figure 2 A schematic structural diagram of a reactive compensation capacity configuration device for a wind-solar-storage station in one embodiment of the present invention is shown;

[0019] Figure 3 A schematic structural diagram of a reactive compensation capacity configuration device for a wind-solar-storage station in one embodiment of the present invention is shown. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0021] See also Figure 1 In one embodiment, a method for configuring reactive power compensation capacity of a wind-solar-storage station specifically includes the following steps:

[0022] Step S101: Calculate the maximum energy storage active power and the maximum wind power active power under different photovoltaic active power conditions.

[0023] Step S102: Calculate the station reactive loss and station reactive power corresponding to each photovoltaic active power condition based on the photovoltaic active power, maximum energy storage active power and maximum wind power active power of each photovoltaic active power condition.

[0024] Step S103: Determine the reactive compensation demand under each photovoltaic active power condition by using the difference between the station reactive loss and the station reactive power under each photovoltaic active power condition.

[0025] Step S104: Determine reactive compensation capacity using the maximum reactive compensation demand among the reactive compensation demands under the actual active power conditions of the photovoltaics, so as to configure the idle capacity of the energy storage area according to the reactive compensation capacity.

[0026] Specifically, under a specific operating mode of a wind, solar, and storage station, the reactive power loss of the wind, solar, and storage station minus the maximum reactive power generated by various reactive power sources represents the station's reactive compensation capacity requirement for that mode. This embodiment of the present invention considers all normal operating modes and determines the maximum reactive compensation capacity requirement for each. If the maximum reactive compensation value is used as the minimum reactive compensation capacity required by the station, the station can cope with reactive losses under all normal operating conditions, maximizing the power factor of the wind, solar, and storage station and ensuring the most efficient active power output.

[0027] Under the premise of unchanged voltage, the greater the active power of the station, the greater the current, the corresponding greater the reactive loss of the station, and thus the greater the demand for reactive compensation capacity. Therefore, this embodiment calculates the reactive compensation capacity demand according to the maximum active power of the station under normal operating mode.

[0028] Based on the above-mentioned ideas provided by the embodiments of the present invention, and further considering that the reactive power provided by wind power is relatively small and has a relatively small impact on the reactive compensation capacity demand of the station, and considering that the active power output of energy storage mainly plays a supporting role and needs to change with the active output of photovoltaic and wind power, this embodiment uses photovoltaic active power as the independent variable and calculates the maximum energy storage active power and maximum wind power active power under different photovoltaic active power conditions for multiple photovoltaic active power conditions, thereby further determining the maximum station active power under different photovoltaic active power conditions. Then, using the photovoltaic active power, maximum energy storage active power, and maximum wind power active power under each photovoltaic active power condition, the station reactive loss and station reactive power corresponding to each photovoltaic active power condition are comprehensively calculated. Then, for each photovoltaic active power condition, the difference between the corresponding station reactive loss and station reactive power is calculated to obtain the reactive compensation demand corresponding to each photovoltaic active power condition. Finally, the maximum reactive compensation demand is found from the reactive compensation demand corresponding to each photovoltaic active power condition. This maximum value serves as the minimum scale of reactive compensation that the station needs to configure. In other words, when configuring the idle capacity of energy storage, the configured idle capacity must at least reach the maximum reactive compensation demand. The configured capacity can be greater than the maximum reactive compensation demand, but cannot be less than this value. Therefore, the idle energy storage capacity configured by the embodiment of the present invention can cope with reactive losses under various normal operating conditions. Even if the wind, solar, and storage systems are all outputting at maximum active power, the reactive losses generated by the station are very large, and the configured idle energy storage capacity can also provide reactive compensation for them. If the configured idle energy storage capacity is equal to the maximum reactive compensation demand, the reactive compensation requirements are met while avoiding the waste caused by over-configuration of capacity. This fully utilizes the idle capacity of the energy storage system to provide reactive support, reduces the need to build reactive compensation devices in wind, solar, and storage power stations, reduces the total investment in the power station, improves the economic efficiency of the project, and reduces social electricity costs.

[0029] Specifically, in one embodiment, the method for configuring reactive power compensation capacity for a wind, solar, and storage station provided by the present invention uses a voltage value obtained by reducing the station's rated voltage by a predetermined multiple when calculating the station's reactive power and reactive loss corresponding to each photovoltaic active power condition. Specifically, this embodiment further considers that, assuming the station's active power remains constant, lower voltages correspond to higher currents, which in turn increases the station's reactive power loss and, consequently, the station's demand for reactive power compensation capacity. Therefore, this embodiment calculates the reactive power compensation capacity requirement based on the lowest voltage under normal operating conditions. Safety regulations typically stipulate that the voltage deviation for new energy stations should be within a range of -3% to +7% of the nominal voltage. Therefore, in this embodiment, the voltage used in the calculation is 0.97 times the rated voltage. This is done to obtain the maximum reactive power compensation requirement under both maximum active power and minimum voltage conditions, thereby ensuring that the configured reactive power compensation capacity can meet the reactive power losses generated by the wind, solar, and storage station under all normal operating conditions.

[0030] Specifically, in one embodiment, the above step S101 specifically includes the following steps:

[0031] Step 1: Obtain the rated active power of photovoltaic power, wind power, and energy storage.

[0032] Step 2: Determine the maximum active power of the site based on the sum of the rated active power of photovoltaic power and the rated active power of wind power.

[0033] Step 3: Take values from the PV rated active power at preset proportional intervals to obtain multiple different PV generated active powers.

[0034] Step 4: Use the difference between the maximum active power of the site and the current actual active power generated by the photovoltaic system to determine the current allowable active power of the energy storage. The current allowable active power of the energy storage represents the maximum active power that the site is currently allowed to generate from the energy storage.

[0035] Step 5: Determine the current maximum energy storage active power corresponding to the current photovoltaic active power based on the smaller value of the current energy storage allowable active power and the energy storage rated active power.

[0036] Step 6: Use the difference between the maximum active power of the site, the current photovoltaic active power, and the current maximum energy storage active power to determine the current allowable wind power active power. The current allowable wind power active power represents the maximum active power currently allowed for wind power generation at the site.

[0037] Step 7: Determine the current maximum wind power active power corresponding to the current photovoltaic active power based on the smaller value of the current wind power allowable active power and the wind power rated active power.

[0038] Specifically, before calculating the maximum wind power active power and the maximum energy storage active power with photovoltaic active power as the independent variable, first obtain the installed capacity P of wind power, photovoltaic power and energy storage of the wind-solar-storage station. wi,N 、P so,N and P st,N , namely the rated active power of photovoltaic power, the rated active power of wind power and the rated active power of energy storage. Since energy storage mainly plays the role of smoothing the output of new energy and promoting the consumption of new energy, this embodiment does not consider the situation where energy storage is fully generated when wind and solar power are fully generated, so the maximum active power of the transmission line configured by the wind, solar and energy storage station is determined to be P N =P wi,N +P so,N , that is, the maximum active power allowed to be generated by the wind-solar-storage station is P N In order to use the photovoltaic active power P so As the independent variable, the value is taken from the photovoltaic rated active power at a preset proportional interval to obtain multiple different photovoltaic active powers. For example, if a suitable positive integer n is selected as the number of different photovoltaic active powers, the photovoltaic active power value is

[0039]

[0040] Where, P so,i represents the active power generated by the ith photovoltaic power station, That is, the preset proportional interval is set from the photovoltaic rated power P so,N The n photovoltaic active powers are incrementally extracted to represent the n normal operating conditions.

[0041] Then, for each photovoltaic active power, the corresponding maximum energy storage active power and wind power maximum active power are calculated. The calculation process is as follows:

[0042] The greater the active power of the energy storage, the smaller the maximum reactive power it can provide, and the greater the demand for reactive power compensation capacity at the site. so,i When the maximum active power of energy storage is P st ,max ,i P st,max,i =min{P st,N ,P N -P so,i}. That is, P N It is the maximum active power that the wind and solar storage station can send out as a whole, minus the actual active power of photovoltaic power P so,i The following is the allowed active power of energy storage, which represents the maximum active power allowed to be emitted by the energy storage from the overall perspective of the station, P st,N As the energy storage rated power, when both of the above two conditions are met, the maximum energy storage active power takes the minimum of the above two values.

[0043] Similarly, when the photovoltaic active power is P so,i And the maximum active power P of energy storage st,max,i After determination, take the maximum active power of wind power as P wi,max,i =min{P wi,N ,P N -P so,i -P st,max,i}. Among them, P N -P so,i -P st,max,i It indicates the maximum power that the site allows wind power to generate after the actual active power of photovoltaic power generation and the maximum active power of energy storage are determined, that is, the allowed active power of wind power.

[0044] Specifically, in one embodiment, the above step S102 specifically includes the following steps:

[0045] Step 8: Based on the actual photovoltaic active power, maximum energy storage active power and maximum wind power active power of each photovoltaic active power condition, calculate the wind farm area reactive loss, photovoltaic area reactive loss, energy storage area reactive loss, boost transformer reactive loss and transmission line reactive loss corresponding to each photovoltaic active power condition.

[0046] Step 9: Calculate the sum of the wind farm reactive loss, photovoltaic reactive loss, energy storage reactive loss, boost transformer reactive loss, and transmission line reactive loss corresponding to each photovoltaic active power condition as the station reactive loss corresponding to each photovoltaic active power condition.

[0047] Specifically, in this embodiment of the present invention, to further improve the accuracy of reactive power compensation capacity configuration, improving the accuracy of reactive power loss calculation is a prerequisite. This embodiment accurately calculates the overall reactive power loss of a station from five aspects: wind farm reactive power loss, photovoltaic reactive power loss, energy storage reactive power loss, boost transformer reactive power loss, and transmission line reactive power loss. The reactive power loss of the station corresponding to n photovoltaic active power conditions is calculated using the following method.

[0048] The reactive loss of the wind-solar-storage station corresponding to each photovoltaic active power condition is obtained by adding up the reactive loss of the wind farm area, the reactive loss of the photovoltaic area, the reactive loss of the energy storage area, the reactive loss of the boost transformer, and the reactive loss of the transmission line. The calculation method of each part is as follows.

[0049] 1. Reactive power loss in wind farm area

[0050] Among them, the reactive loss of the wind farm area is obtained by adding the reactive loss of the wind turbine to the box transformer line, the reactive loss of the wind turbine box transformer, and the reactive loss of the wind farm area collection line. The calculation methods of each part are as follows.

[0051] (a) The reactive power loss of a single wind turbine to box-type transformer line is calculated using equations (1) and (2), where voltage, active power, and power factor angle are the voltage, active power, and maximum power factor angle of the wind turbine, respectively. The reactive power loss of all wind turbine to box-type transformer lines within the site is summed to obtain the reactive power loss of the wind turbine to box-type transformer line for the entire site.

[0052] Line reactive loss Q L (Unit: Mvar) The calculation formula is:

[0053] Q L =3I 2 X (1)

[0054] Where I is the line current in kA, calculated by equation (2); X is the line equivalent reactance in Ω.

[0055]

[0056] Where S is the apparent power of the line, in MVA; U is the line voltage, in kV; P is the active power of the line, in MW, which is the current maximum wind power active power. is the line power factor.

[0057] (b) The reactive power loss of a single fan box is calculated using the following formula (3):

[0058]

[0059] Where Q T is the reactive loss of the transformer, in Mvar; U k % is the percentage of transformer short-circuit voltage; I0% is the percentage of transformer no-load current; S is the apparent power of the transformer, in MVA; S N is the rated capacity of the transformer in MVA. The apparent power S is calculated according to the following formula (4).

[0060]

[0061] Where P is the current maximum wind power active power, in MW; is the maximum power factor angle of the wind turbine. The reactive loss of all wind turbine chassis transformers in the field is summed to obtain the reactive loss of the wind turbine chassis transformers in the entire field.

[0062] (c) Based on the segmentation of the wind farm's collector lines, the reactive power loss of a single section of the collector line is calculated using equations (1) and (2), where voltage is the voltage on the high-voltage side of the wind turbine box transformer, active power is the sum of the active power of the wind turbines flowing through that section of the collector line, and power factor angle is the maximum power factor angle of the wind turbines. The reactive power loss of all single-section collector lines within the farm is summed to obtain the reactive power loss of the collector lines for the entire farm.

[0063] 2. Calculation of reactive power loss in photovoltaic field

[0064] The reactive loss of the photovoltaic field is obtained by adding the reactive loss of the photovoltaic inverter to the box transformer line, the reactive loss of the photovoltaic box transformer, and the reactive loss of the photovoltaic field collection line. The calculation method of each part is as follows.

[0065] (a) The reactive power loss of a single PV inverter to box-type transformer line is calculated using equations (1) and (2), where the parameters are replaced. The parameters that need to be replaced are: voltage and active power are taken as the voltage of the PV array and the actual active power of the PV array, respectively, and the power factor is taken as 1. The reactive power loss of all single PV inverter to box-type transformer lines in the site is summed to obtain the reactive power loss of the PV inverter to box-type transformer line in the entire site.

[0066] (b) The reactive power loss of a single PV box transformer is calculated using Equation (3), where the power factor is 1 and the apparent power is equal to the active power of the PV array. The reactive power loss of all PV box transformers within the site is summed to obtain the reactive power loss of the entire site.

[0067] (c) Based on the segmentation of the PV field's collector lines, the reactive power loss of a single section of the collector line is calculated using equations (1) and (2), where voltage is the high-voltage side voltage of the PV box transformer, active power is the sum of the PV active power flowing through that section of the collector line, and the power factor is 1. The reactive power loss of all single-section collector lines within the field is summed to obtain the reactive power loss of the collector lines within the entire field.

[0068] 3. Calculation of reactive power loss in energy storage area

[0069] The reactive loss of the energy storage area is obtained by adding the reactive loss of the line from the energy storage converter to the box transformer, the reactive loss of the energy storage box transformer, and the reactive loss of the energy storage area collection line. The calculation methods of each part are as follows.

[0070] (a) The reactive power loss of a single energy storage converter to the box-type transformer is calculated using equations (1) and (2), where the voltage is the voltage of the battery system connected to the energy storage converter, and the apparent power is the maximum capacity of the energy storage converter. The reactive power loss of all single energy storage converters to the box-type transformer within the site is summed to obtain the reactive power loss of the entire site.

[0071] (b) The reactive power loss of a single energy storage box transformer is calculated using Equation (3), where the apparent power is the maximum capacity of the energy storage converter. The reactive power loss of all single energy storage box transformers in the site is summed to obtain the reactive power loss of the entire site.

[0072] (c) Based on the segmentation of the energy storage field's collector lines, the reactive loss of a single collector line segment is calculated using equations (1) and (2), where voltage is the voltage on the high-voltage side of the energy storage box transformer, and apparent power is the sum of the maximum capacities of the energy storage converters flowing through that segment of the collector line. The reactive loss of all single-segment collector lines within the field is summed to obtain the reactive loss of the collector lines for the entire field.

[0073] 4. Calculation of reactive power loss of boost transformer

[0074] The reactive power loss of a single boost transformer is calculated using Equation (3), where the apparent power is calculated by dividing the active power by the power factor using Equation (4). The active power is the sum of the active power of all wind power, photovoltaic power, and energy storage connected to the boost transformer. The power factor is determined according to local regulations. The reactive power loss of all individual boost transformers in the site is summed to obtain the reactive power loss of the entire site.

[0075] 5. Calculation of reactive power loss of transmission lines

[0076] The reactive power loss of a single transmission line is calculated using equations (1) and (2), where voltage is the voltage on the high-voltage side of the step-up transformer, active power is the sum of the active power of all wind power, photovoltaic power, and energy storage connected to the transmission line, and the power factor is determined according to local regulations. The reactive power loss of all individual transmission lines is summed to obtain the reactive power loss of the entire wind, photovoltaic, and energy storage power station transmission line.

[0077] By calculating the reactive loss of each of the above parts, the accuracy of the reactive loss estimation of the station as a whole is further improved.

[0078] In addition, in this embodiment, the steps for calculating the station reactive power corresponding to each photovoltaic active power condition based on the photovoltaic active power, maximum energy storage active power, and maximum wind power active power of each photovoltaic active power condition are as follows:

[0079] In this embodiment, in order to calculate the reactive power compensation capacity, it is necessary to first calculate the reactive power that the wind, solar and energy storage system can provide as a reactive power source, including:

[0080] 1. Wind farms

[0081] The maximum reactive power Q that a wind farm can provide wi,max (Unit: Mvar)

[0082]

[0083] Where P is the maximum wind power active power, in MW; is the maximum power factor angle of the wind turbine.

[0084] 2. Photovoltaic power stations and energy storage power stations

[0085] The principles of photovoltaic inverters and energy storage converters are similar, and both can provide reactive power support for the system. By utilizing the idle capacity of photovoltaic inverters or energy storage converters, the maximum reactive power Q max (Unit: Mvar)

[0086]

[0087] Where S max is the maximum capacity of the inverter or converter, in MVA; P is the active power of the inverter or converter, in MW. If it is a photovoltaic power station, P is the current photovoltaic active power; if it is an energy storage system, P is the current maximum energy storage active power.

[0088] Through the above steps, the technical solution provided by the present application takes photovoltaic active power as the independent variable, and calculates the maximum energy storage active power and the maximum wind power active power under different photovoltaic actual active power conditions; then, based on the photovoltaic actual active power, the maximum energy storage active power and the maximum wind power active power of each photovoltaic actual active power condition, the station reactive loss and the station reactive power corresponding to each photovoltaic actual active power condition are calculated; thereafter, the difference between the station reactive loss and the station reactive power is calculated under each photovoltaic actual active power condition to obtain the reactive compensation demand under each photovoltaic actual active power condition; finally, the reactive compensation capacity is determined based on the maximum reactive compensation demand. By using the determined reactive compensation capacity to configure the idle energy storage capacity, the reactive loss generated by the wind-solar-storage station under any output conditions can be compensated by the configured idle energy storage capacity. While meeting the power factor of the wind-solar-storage station, the idle capacity of the energy storage system is fully utilized to provide reactive support, reducing the need for reactive compensation devices to be installed in the wind-solar-storage station, reducing the total investment in the station, improving the economic efficiency of the project, and reducing social electricity costs.

[0089] like Figure 2 As shown, this embodiment also provides a reactive power compensation capacity configuration device for a wind-solar-storage station, the device comprising:

[0090] The maximum active power determination module 101 is used to calculate the maximum energy storage active power and the maximum wind power active power under different photovoltaic active power conditions. For details, please refer to the relevant description of step S101 in the above method embodiment, which will not be repeated here.

[0091] The station reactive power calculation module 102 is configured to calculate the station reactive loss and station reactive power corresponding to each photovoltaic active power condition based on the photovoltaic active power, maximum energy storage active power, and maximum wind power active power. For details, see the description of step S102 in the above method embodiment and will not be repeated here.

[0092] Reactive power compensation demand calculation module 103 is used to determine the reactive power compensation demand for each photovoltaic active power condition using the difference between the station reactive power loss and the station reactive power under each photovoltaic active power condition. For details, see the description of step S103 in the above method embodiment and will not be repeated here.

[0093] Reactive compensation capacity configuration module 104 is configured to determine reactive compensation capacity based on the maximum reactive compensation demand among the reactive compensation demands under the actual PV active power conditions, thereby allocating the idle capacity of the energy storage area according to the reactive compensation capacity. For details, refer to the description of step S104 in the above method embodiment and will not be repeated here.

[0094] An embodiment of the present invention provides a reactive compensation capacity configuration device for a wind-solar-storage station, which is used to execute a reactive compensation capacity configuration method for a wind-solar-storage station provided in the above embodiment. Its implementation method and principle are the same. For details, please refer to the relevant description of the above method embodiment and will not be repeated here.

[0095] Through the coordinated cooperation of the above-mentioned components, the technical solution provided by this application takes photovoltaic active power as the independent variable, and calculates the maximum energy storage active power and the maximum wind power active power under different photovoltaic actual active power conditions; then, based on the photovoltaic actual active power, the maximum energy storage active power and the maximum wind power active power of each photovoltaic actual active power condition, the station reactive loss and the station reactive power corresponding to each photovoltaic actual active power condition are calculated; thereafter, the difference between the station reactive loss and the station reactive power is calculated under each photovoltaic actual active power condition to obtain the reactive compensation demand under each photovoltaic actual active power condition; finally, the reactive compensation capacity is determined based on the maximum reactive compensation demand. By using the determined reactive compensation capacity to configure the idle energy storage capacity, the reactive loss generated by the wind-solar-storage station under any output conditions can be compensated by the configured idle energy storage capacity. While meeting the power factor of the wind-solar-storage station, the idle capacity of the energy storage system is fully utilized to provide reactive support, reducing the need for reactive compensation devices to be installed in the wind-solar-storage station, reducing the total investment in the station, improving the economic efficiency of the project, and reducing social electricity costs.

[0096] Figure 3The embodiment of the present invention shows a reactive power compensation capacity device of a wind-solar storage station, which includes a processor 901 and a memory 902, which can be connected via a bus or other means. Figure 3 The bus connection is taken as an example.

[0097] The processor 901 may be a central processing unit (CPU). The processor 901 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0098] Memory 902, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as the program instructions / modules corresponding to the methods in the above-described method embodiments. Processor 901 executes the non-transitory software programs, instructions, and modules stored in memory 902 to perform various processor functions and data processing, thereby implementing the methods in the above-described method embodiments.

[0099] The memory 902 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created by the processor 901, etc. In addition, the memory 902 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 902 may optionally include a memory remotely located relative to the processor 901, and these remote memories may be connected to the processor 901 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0100] One or more modules are stored in the memory 902 and, when executed by the processor 901 , perform the method in the above method embodiment.

[0101] The specific details of the reactive power compensation capacity equipment of the above-mentioned wind-solar storage station can be understood by referring to the corresponding descriptions and effects in the above-mentioned method embodiments, and will not be repeated here.

[0102] Those skilled in the art will appreciate that all or part of the processes in the above-described embodiments can be implemented by instructing related hardware through a computer program. The implemented program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above-described embodiments. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD), or a solid-state drive (SSD). The storage medium can also include a combination of the above-mentioned types of memory.

[0103] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A method for configuring reactive power compensation capacity of a wind-solar-storage station, characterized in that: The method comprises: Calculate the maximum energy storage active power and maximum wind power active power under different photovoltaic active power conditions; Based on the photovoltaic active power, maximum energy storage active power and maximum wind power active power of each photovoltaic active power condition, the station reactive loss and station reactive power corresponding to each photovoltaic active power condition are calculated; The reactive power compensation requirement under each photovoltaic active power condition is determined by using the difference between the reactive power loss and the reactive power of the station under each photovoltaic active power condition; The reactive compensation capacity is determined by using the maximum reactive compensation demand among the reactive compensation demands under the actual active power conditions of each photovoltaic generator, so as to configure the idle capacity of the energy storage area according to the reactive compensation capacity.

2. The method according to claim 1, characterized in that Calculate the maximum energy storage active power under different PV active power conditions, including: Obtain the rated active power of photovoltaic power, wind power and energy storage; Determining the maximum active power of the site based on the sum of the photovoltaic rated active power and the wind power rated active power; Taking values from the photovoltaic rated active power at preset proportional intervals to obtain a plurality of different photovoltaic generated active powers; The current allowed active power of energy storage is determined by using the difference between the maximum active power of the station and the current photovoltaic active power, wherein the current allowed active power of energy storage represents the maximum active power currently allowed to be emitted by the energy storage at the station; The current maximum energy storage active power corresponding to the current photovoltaic active power is determined based on the smaller value of the current energy storage allowable active power and the energy storage rated active power.

3. The method according to claim 2, characterized in that Calculate the maximum wind power under different photovoltaic active power conditions, including: Determine the current wind power allowable active power by using the difference between the maximum active power of the station, the current photovoltaic active power, and the current maximum energy storage active power, where the current wind power allowable active power represents the maximum active power currently allowed for wind power generation by the station; The current maximum wind power active power corresponding to the current photovoltaic active power is determined based on the smaller value of the current wind power allowable active power and the wind power rated active power.

4. The method according to claim 1, wherein When calculating the site reactive loss and site reactive power corresponding to each photovoltaic active power condition, the voltage value used in the calculation is the voltage value obtained by reducing the site rated voltage by a preset multiple.

5. The method according to claim 4, characterized in that The preset multiple is 0.97 times.

6. The method according to claim 1, characterized in that Based on the actual photovoltaic active power, maximum energy storage active power, and maximum wind power active power of each photovoltaic active power condition, the station reactive loss corresponding to each photovoltaic active power condition is calculated, including: Based on the photovoltaic active power, maximum energy storage active power and maximum wind power active power of each photovoltaic active power condition, the reactive loss of the wind farm area, the reactive loss of the photovoltaic area, the reactive loss of the energy storage area, the reactive loss of the boost transformer and the reactive loss of the transmission line corresponding to each photovoltaic active power condition are calculated; The sum of the reactive loss of the wind farm area, the reactive loss of the photovoltaic area, the reactive loss of the energy storage area, the reactive loss of the boost transformer, and the reactive loss of the transmission line corresponding to each photovoltaic actual active power condition is calculated as the station reactive loss corresponding to each photovoltaic actual active power condition.

7. The method according to claim 6, characterized in that The reactive loss of the wind farm area includes the reactive loss of the wind turbine to box transformer line, the reactive loss of the wind turbine box transformer and the reactive loss of the wind farm collection line; the reactive loss of the photovoltaic area includes the reactive loss of the photovoltaic inverter to box transformer line, the reactive loss of the photovoltaic box transformer and the reactive loss of the photovoltaic area collection line; the reactive loss of the energy storage area includes the reactive loss of the energy storage converter to box transformer line, the reactive loss of the energy storage box transformer and the reactive loss of the energy storage area collection line.

8. A reactive power compensation capacity configuration device for a wind-solar storage station, characterized in that: The device comprises: The maximum active power determination module is used to calculate the maximum energy storage active power and the maximum wind power active power under different photovoltaic active power conditions; The station reactive power calculation module is used to calculate the station reactive loss and station reactive power corresponding to each photovoltaic active power condition based on the photovoltaic active power, maximum energy storage active power and maximum wind power active power of each photovoltaic active power condition; The reactive power compensation demand calculation module is used to determine the reactive power compensation demand under the actual active power conditions of each photovoltaic power generation by using the difference between the reactive power loss of the station and the reactive power of the station under the actual active power conditions of each photovoltaic power generation; The reactive compensation capacity configuration module is used to determine the reactive compensation capacity by using the maximum reactive compensation demand among the reactive compensation demands under the actual active power conditions of each photovoltaic power generation, so as to configure the idle capacity of the energy storage area according to the reactive compensation capacity.

9. A reactive power compensation capacity configuration device for a wind-solar storage station, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 7 by executing the computer instructions.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method according to any one of claims 1 to 7.

Images