Reactive compensation configuration method

Abstract

The embodiment of the invention discloses a reactive compensation configuration method, which comprises the following steps of: calculating reactive loss and charging power of a line in a target main body, calculating reactive loss of a transformer in the target main body, and obtaining charging and discharging active power and power factors of an energy storage converter in an energy storage power station, then, according to the adjusting power of all the energy storage converters in the energy storage power station, the reactive power loss and the charging power of all the lines in the target main body and the reactive power loss of all the transformers in the target main body, reactive power compensation configuration capacity is calculated; finally, the reactive compensation configuration capacity is made to be minimum by equally adjusting power factors of all energy storage converters in the energy storage power station, the minimum reactive compensation configuration capacity serves as the capacity of a reactive compensation device needing to be configured, and the target body comprises a wind power station and the energy storage power station; reactive compensation configuration is reduced, cost is reduced, and power fluctuation and the like of a wind power station can be effectively stabilized.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular, to a reactive power compensation configuration method. Background Art

[0002] When a wind farm is in operation, it has a relatively high dependence on reactive power. With the continuous growth of the scale and capacity of wind power grid connection, if appropriate reactive power compensation measures are not taken, the reactive power deficit in the power system will intensify, and the impact on the voltage of the power system will also continuously increase, thus posing a major threat to the safe and stable operation of the power grid. Therefore, in order to reduce the impact of wind power grid connection on the power system and improve the stability of the wind farm connected to the power system, it is an urgent need to optimize the reactive power compensation for the wind farm connected to the power system.

[0003] Currently, for the reactive power compensation configuration of wind farms, there are mainly problems such as a relatively large reactive power compensation configuration, high cost, and difficulty in suppressing the power fluctuations of wind farms. Summary of the Invention

[0004] Based on this, in view of the above problems, it is necessary to propose a reactive power compensation configuration method, which can reduce the reactive power compensation configuration, lower the cost, and can effectively suppress the power fluctuations of the wind farm, improve the voltage level of the wind farm, enhance the stability and security of wind power grid connection, and increase the return rate of the energy storage power station, etc.

[0005] To achieve the above object, in a first aspect, the present invention provides a reactive power compensation configuration method, the method comprising: Calculating the reactive power loss and charging power of the lines in the target entity, and calculating the reactive power loss of the transformers in the target entity; Obtaining the charging and discharging active power and power factor of the energy storage converters in the energy storage power station to calculate the regulation power of the energy storage converters in the energy storage power station; Calculating the reactive power compensation configuration capacity according to the regulation power of all the energy storage converters in the energy storage power station, the reactive power loss and charging power of all the lines in the target entity, and the reactive power loss of all the transformers in the target entity; Obtaining the power factor adjustment range of the energy storage converters in the energy storage power station, and equally adjusting the power factors of all the energy storage converters in the energy storage power station according to the power factor adjustment range of the energy storage converters in the energy storage power station, so that the reactive power compensation configuration capacity reaches the minimum, and taking the minimum reactive power compensation configuration capacity as the capacity of the reactive power compensation device to be configured; Wherein, the target entity includes a wind farm and the energy storage power station.

[0006] Optionally, calculating the reactive power loss of the lines in the target entity includes: Obtain the line voltage, active power, reactive power, and line reactance of the lines in the target entity; Calculate the reactive power loss of the lines in the target entity based on the line voltage, active power, reactive power, and line reactance of the lines in the target entity.

[0007] Optionally, calculating the charging power of the lines in the target entity includes: Obtain the line voltage, angular frequency, and capacitance to ground of the lines in the target entity; Calculate the charging power of the lines in the target entity based on the line voltage, angular frequency, and capacitance to ground of the lines in the target entity.

[0008] Optionally, calculating the reactive power loss of the transformers in the target entity includes: Obtain the voltage on the high-voltage side, active power, reactive power, rated capacity, percentage of no-load current, and the nominal value of the transformer reactance of the transformers in the target entity; Calculate the reactive power loss of the transformers in the target entity based on the voltage on the high-voltage side, active power, reactive power, rated capacity, percentage of no-load current, and the nominal value of the transformer reactance of the transformers in the target entity.

[0009] Optionally, calculating the reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station, the reactive power loss and charging power of all lines in the target entity, and the reactive power loss of all transformers in the target entity includes: Calculate the capacitive reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station and the charging power of all lines in the target entity; Calculate the inductive reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station, the reactive power loss of all lines in the target entity, and the reactive power loss of all transformers in the target entity; Take the capacitive reactive power compensation configuration capacity to the inductive reactive power compensation configuration capacity as the reactive power compensation configuration capacity.

[0010] Optionally, calculating the regulation power of the energy storage converters in the energy storage power station includes: Use the formula Calculate the regulation power of the energy storage converters in the energy storage power station; where, is the regulation power of the energy storage converters in the energy storage power station, is the charging and discharging active power of the energy storage converters in the energy storage power station, is the power factor of the energy storage converters in the energy storage power station.

[0011] Optionally, calculating the reactive power loss of the line in the target entity based on the line voltage, active power, reactive power, and line reactance of the line in the target entity includes: Using the formula to calculate the reactive power loss of the line in the target entity; where is the reactive power loss of the line in the target entity, is the line reactance of the line in the target entity, is the active power of the line in the target entity, is the reactive power of the line in the target entity, is the line voltage of the line in the target entity.

[0012] Optionally, calculating the charging power of the line in the target entity based on the line voltage, angular frequency, and capacitance to ground of the line in the target entity includes: Using the formula to calculate the charging power of the line in the target entity; where is the charging power of the line in the target entity, is the line voltage of the line in the target entity, is the angular frequency of the line in the target entity, is the capacitance to ground of the line in the target entity.

[0013] Optionally, calculating the reactive power loss of the transformer in the target entity based on the high-voltage side voltage, active power, reactive power, rated capacity, no-load current percentage, and nominal value of the transformer reactance of the transformer in the target entity includes: Using the formula to calculate the reactive power loss of the transformer in the target entity; where is the reactive power loss of the transformer in the target entity, is the nominal value of the transformer reactance of the transformer in the target entity, is the active power of the i-th transformer in the target entity, is the reactive power of the transformer in the target entity, is the high-voltage side voltage of the transformer in the target entity, is the no-load current percentage of the transformer in the target entity, is the rated capacity of the transformer in the target entity.

[0014] Optionally, calculating the capacitive reactive power compensation configuration capacity based on the regulation power of all energy storage converters in the energy storage power station and the charging power of all lines in the target entity includes: Calculate the capacitive reactive power compensation configuration capacity using the formula ; Calculating the inductive reactive power compensation configuration capacity based on the regulation power of all energy storage converters in the energy storage power station, the reactive power losses of all lines in the target entity, and the reactive power losses of all transformers in the target entity includes: Calculate the inductive reactive power compensation configuration capacity using the formula ; wherein, ; In the above formula, is the capacitive reactive power compensation configuration capacity, is the sum of the regulation powers of all energy storage converters in the energy storage power station, is the sum of the reactive power losses of all energy storage collector lines and all energy storage access lines in the energy storage power station, is the sum of the reactive power losses of all energy storage step-up transformers in the energy storage power station, is the sum of the reactive power losses of all wind power collector lines, all wind power submarine cable transmission lines, and all wind power onshore transmission lines in the wind farm, is the sum of the reactive power losses of all wind turbine unit transformers and all wind power step-up transformers in the wind farm, is the inductive reactive power compensation configuration capacity, is the sum of the charging powers of all energy storage collector lines and all energy storage access lines in the energy storage power station, is the sum of the charging powers of all wind power collector lines, all wind power submarine cable transmission lines, and all wind power onshore transmission lines in the wind farm, is the sum of the charging powers of all wind power submarine cable transmission lines and all wind power onshore transmission lines in the wind farm, is the regulation power of the th energy storage converter in the energy storage power station, is the reactive power loss of the rd energy storage collector line in the energy storage power station, is the reactive power loss of the th energy storage access line in the energy storage power station, is the reactive power loss of the th energy storage step-up transformer in the energy storage power station, is the reactive power loss of the th wind power collector line in the wind farm, is the reactive power loss of the th wind power submarine cable transmission line in the wind farm, is the reactive power loss of the Reactive power loss of the th wind turbine unit transformer in the wind farm station, the th wind power step-up transformer in the wind farm station, the charging power of the th energy storage collector line in the energy storage station, the charging power of the th energy storage access line in the energy storage station, the charging power of the th wind power collector line in the wind farm station, the charging power of the th wind power submarine cable outgoing line in the wind farm station, the charging power of the th wind power land outgoing line in the wind farm station.

[0015] To achieve the above object, in a second aspect, the present invention provides a reactive power compensation configuration device, which includes: A reactive power loss and charging power calculation module, configured to calculate the reactive power loss and charging power of the lines in the target entity, and calculate the reactive power loss of the transformers in the target entity; An adjustment power calculation module, configured to obtain the charging and discharging active power and power factor of the energy storage converters in the energy storage station, so as to calculate the adjustment power of the energy storage converters in the energy storage station; A reactive power compensation calculation module, configured to calculate the reactive power compensation configuration capacity according to the adjustment power of all energy storage converters in the energy storage station, the reactive power loss and charging power of all lines in the target entity, and the reactive power loss of all transformers in the target entity; An adjustment module, configured to obtain the power factor adjustment range of the energy storage converters in the energy storage station, and evenly adjust the power factor of all energy storage converters in the energy storage station according to the power factor adjustment range of the energy storage converters in the energy storage station, so that the reactive power compensation configuration capacity reaches the minimum, and use the minimum reactive power compensation configuration capacity as the capacity of the reactive power compensation device to be configured; wherein, the target entity includes a wind farm station and the energy storage station.

[0016] To achieve the above object, in a third aspect, the present invention provides a computer-readable storage medium storing a computer program, which when executed by a processor causes the processor to execute the method according to any one of the first aspect.

[0017] To achieve the above object, in a fourth aspect, the present invention provides a computer device, including a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor executes the method described in any item of the first aspect.

[0018] Adopting the embodiment of the present invention has the following beneficial effects: The above method calculates the reactive power loss and charging power of the lines in the target entity, and calculates the reactive power loss of the transformers in the target entity; then obtains the charging and discharging active power and power factor of the energy storage converters in the energy storage power station to calculate the adjustment power of the energy storage converters in the energy storage power station. Then, according to the adjustment power of all the energy storage converters in the energy storage power station, the reactive power loss and charging power of all the lines in the target entity, and the reactive power loss of all the transformers in the target entity, the reactive power compensation configuration capacity is calculated; finally, the power factor adjustment range of the energy storage converters in the energy storage power station is obtained, and the power factors of all the energy storage converters in the energy storage power station are evenly adjusted according to the power factor adjustment range of the energy storage converters in the energy storage power station, so that the reactive power compensation configuration capacity reaches the minimum, and the minimum reactive power compensation configuration capacity is used as the capacity of the reactive power compensation device to be configured, where the target entity includes a wind farm and an energy storage power station; that is: by using the energy storage power station supporting the wind farm, considering the reactive power compensation that the energy storage power station can provide, and adjusting the power factor of the energy storage converters in the energy storage power station, the reactive power compensation configuration capacity is minimized, thereby reducing the reactive power compensation configuration and cost; in addition, by the energy storage power station participating in the reactive power regulation of the wind farm, not only can the power fluctuation of the wind farm be effectively suppressed, but also the voltage level of the wind farm can be improved, the stability and safety of wind power grid connection can be improved, and the rate of return of the energy storage power station can be increased, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Among them: Figure 1 It is a topological schematic diagram of a wind farm and an energy storage power station supporting the wind farm in an embodiment of the present application; Figure 2 It is a schematic diagram of a reactive power compensation configuration method in an embodiment of the present application; Figure 3 It is a schematic diagram of a reactive power compensation configuration device in an embodiment of the present application; Figure 4 It is an internal structure diagram of a computer device in some embodiments. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] When a wind farm is in operation, its dependence on reactive power is quite high. With the continuous growth of the scale and capacity of wind power grid connection, if appropriate reactive power compensation measures are not taken, the reactive power shortage in the power system will intensify, and the impact on the voltage of the power system will also continuously increase, thus posing a major threat to the safe and stable operation of the power grid. Therefore, in order to reduce the impact of wind power grid connection on the power system and improve the stability of the wind farm connected to the power system, it is an urgent need to optimize the reactive power compensation of the wind farm connected to the power system.

[0023] Currently, there are mainly problems in the reactive power compensation configuration of wind farms, such as large reactive power compensation configuration, high cost, and difficulty in suppressing the power fluctuations of wind farms.

[0024] In view of the above problems, the present application proposes a reactive power compensation configuration method, which can reduce the reactive power compensation configuration, lower the cost, and can effectively suppress the power fluctuations of the wind farm, improve the voltage level of the wind farm, improve the stability and safety of wind power grid connection, and improve the rate of return of the energy storage power station, etc. The specific implementation principle will be described in detail in the following embodiments.

[0025] To facilitate the detailed description of the following embodiments of the present application, the present application first provides a topological schematic diagram of a wind farm and an energy storage power station supporting the wind farm, so as to better understand the content in the embodiments of the present application with the help of this schematic diagram; please refer to Figure 1 , which is a topological schematic diagram of a wind farm and an energy storage power station supporting the wind farm in the embodiments of the present application. The schematic diagram shows that the wind farm is connected to the power grid. The wind farm includes lines, transformers, and wind turbines. Among them, the lines include land transmission lines, submarine cable transmission lines, and wind power collection lines, and the transformers include wind power step-up transformers and wind turbine unit transformers (i.e., box transformers); the energy storage power station supporting the wind farm includes lines, transformers, energy storage converters, and energy storage groups. Among them, the lines include energy storage access lines and energy storage collection lines, and the transformers include energy storage step-up transformers.

[0026] Please refer to Figure 2 , which is a schematic diagram of a reactive power compensation configuration method in the embodiments of the present application. The method includes: Step 210: Calculate the reactive power loss and charging power of the lines in the target entity, and calculate the reactive power loss of the transformers in the target entity.

[0027] In some embodiments, the line voltage, active power, reactive power, and line parameters of the lines in the target entity can be obtained, and then the reactive power loss and charging power of the lines in the target entity can be calculated based on the line voltage, active power, reactive power, and line parameters of the lines in the target entity. Also, obtain the high-voltage side voltage, active power, reactive power, and transformer parameters of the transformers in the target entity; calculate the reactive power loss of the transformers in the target entity based on the high-voltage side voltage, active power, reactive power, and transformer parameters of the transformers in the target entity. Of course, in other embodiments, it is also possible to only obtain the line voltage, active power, and line parameters of the lines in the target entity, and then calculate the reactive power loss and charging power of the lines in the target entity based on the line voltage, active power, and line parameters of the lines in the target entity.

[0028] The target entity of this application includes a wind farm and an energy storage power station. In some embodiments, taking Figure 1 the lines and transformers shown as an example, the lines include the onshore transmission lines, submarine cable transmission lines, and wind power collection lines of the wind farm, as well as the energy storage access lines and energy storage collection lines of the energy storage power station. The reactive power loss and charging power of the lines in the target entity include the reactive power loss and charging power of the onshore transmission lines, submarine cable transmission lines, and wind power collection lines in the wind farm, as well as the reactive power loss and charging power of the energy storage access lines and energy storage collection lines in the energy storage power station. The transformers include the wind power step-up transformers and wind turbine unit transformers of the wind farm, as well as the energy storage step-up transformers of the energy storage power station. The reactive power loss of the transformers in the target entity includes the reactive power loss of the wind power step-up transformers, the reactive power loss of the wind turbine unit transformers in the wind farm, and the reactive power loss of the energy storage step-up transformers in the energy storage power station.

[0029] Step 220: Obtain the charge-discharge active power and power factor of the energy storage converters in the energy storage power station to calculate the regulation power of the energy storage converters in the energy storage power station.

[0030] It should be noted that the charging active power of the energy storage inverter in the energy storage power station refers to the actual work power provided when the electric energy is transmitted from the outside (such as wind farms, power grids, etc.) to the energy storage group for charging, that is, the energy that can be truly converted into useful work during the charging process. The discharge active power of the energy storage inverter in the energy storage power station refers to the actual work power provided by the energy storage inverter when releasing electric energy from the energy storage group to the outside. The power factor of the energy storage inverter in the energy storage power station refers to the relationship between the active power and reactive power provided by the energy storage inverter to the outside in the energy storage system; wherein, the power factor can be positive, negative or zero.

[0031] In some embodiments, the regulating power of the energy storage inverter in the energy storage power station can be calculated based on the charging and discharging active power and power factor of the energy storage inverter in the energy storage power station; wherein, the regulating power of the energy storage inverter in the energy storage power station is correlated with the power factor, that is, the regulating power of the energy storage inverter in the energy storage power station can also be a positive value, a negative value or zero.

[0032] Step 230: Calculate the reactive compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station, the reactive loss and charging power of all lines in the target entity, and the reactive loss of all transformers in the target entity.

[0033] Step 240: Obtain the power factor adjustment range of the energy storage converter in the energy storage power station, and evenly adjust the power factors of all energy storage converters in the energy storage power station according to the power factor adjustment range of the energy storage converter in the energy storage power station, so that the reactive power compensation configuration capacity reaches the minimum, and use the minimum reactive power compensation configuration capacity as the capacity of the reactive power compensation device to be configured.

[0034] Among them, the power factor adjustment range of the energy storage inverter in the energy storage power station is a parameter of the energy storage inverter, which depends on the capacity, topology, control strategy and input and output power levels of the energy storage inverter; in some embodiments, the power factor adjustment range of the energy storage inverter in the energy storage power station can be -0.95 to 0.95, where below 0 is capacitive and above 0 is inductive, that is, it can be understood that the reactive compensation configuration capacity of the present application includes capacitive reactive compensation configuration capacity and inductive reactive compensation configuration capacity.

[0035] It should be noted that, since the regulating power of the energy storage inverter in the energy storage power station is correlated with the power factor, the regulating power in the energy storage inverter can be changed by adjusting the power factor of the energy storage inverter, so that the reactive power compensation configuration capacity is minimized, and then the minimum reactive power compensation configuration capacity is used as the capacity of the reactive power compensation device to be configured, so as to determine the capacity of the reactive power compensation device to be configured in the wind farm (similar to the above embodiment, the capacity of the reactive power compensation device includes the capacitive reactive power compensation configuration capacity to the inductive reactive power compensation configuration capacity).

[0036] It should be further explained that, since the power generation of all energy storage converters in the energy storage power station needs to be consistent, that is, the power factors of all energy storage converters in the energy storage power station need to be consistent, it is possible to ensure that the energy storage converters in the energy storage power station will not cause accidents such as fire due to inconsistent power generation. Therefore, it is necessary to evenly adjust the power factors of all energy storage converters in the energy storage power station; of course, if accidents such as fire are not considered, in some embodiments, the power factor adjustment range of the i-th energy storage converter in the energy storage power station can also be obtained, and the power factor of the i-th energy storage converter in the energy storage power station can be adjusted according to the power factor adjustment range of the i-th energy storage converter in the energy storage power station, and the above steps are repeated, i successively takes integers greater than 0, so that the reactive compensation configuration capacity is minimized, and the minimum reactive compensation configuration capacity is used as the capacity of the reactive compensation device to be configured.

[0037] In an embodiment of the present application, the reactive loss and charging power of the lines in the target subject are calculated, as well as the reactive loss of the transformer in the target subject; then the charging and discharging active power and power factor of the energy storage inverter in the energy storage power station are obtained to calculate the regulating power of the energy storage inverter in the energy storage power station, and then the reactive compensation configuration capacity is calculated according to the regulating power of all energy storage inverters in the energy storage power station, the reactive loss and charging power of all lines in the target subject, and the reactive loss of all transformers in the target subject; finally, the power factor adjustment range of the energy storage inverter in the energy storage power station is obtained, and the power factors of all energy storage inverters in the energy storage power station are equally adjusted according to the power factor adjustment range of the energy storage inverter in the energy storage power station. , so that the reactive compensation configuration capacity is minimized, and the minimum reactive compensation configuration capacity is used as the capacity of the reactive compensation device to be configured, wherein the target subjects include wind farms and energy storage power stations; that is: by utilizing the energy storage power station supporting the wind farm, considering the reactive compensation that the energy storage power station can provide, and adjusting the power factor of the energy storage converter in the energy storage power station, the reactive compensation configuration capacity is minimized, thereby reducing the reactive compensation configuration and reducing costs; in addition, by having the energy storage power station participate in the reactive power regulation of the wind farm, it is possible to effectively smooth out the power fluctuation of the wind farm, and improve the voltage level of the wind farm, improve the stability and safety of wind power grid connection, and increase the rate of return of the energy storage power station.

[0038] In a feasible implementation, step 210 in the above embodiment, calculating the reactive loss of the line in the target body, includes: obtaining the line voltage, active power, reactive power and line reactance of the line in the target body; calculating the reactive loss of the line in the target body according to the line voltage, active power, reactive power and line reactance of the line in the target body.

[0039] In the embodiments of the present application, by calculating the reactive power loss of the lines in the target entity based on the line voltage, active power, reactive power, and line reactance of the lines in the target entity, the accuracy and reliability of calculating the reactive power loss of the lines in a wind farm and an energy storage power station can be improved.

[0040] In a feasible implementation manner, step 210 in the above embodiment, which calculates the charging power of the lines in the target entity, includes: obtaining the line voltage, angular frequency, and capacitance to ground of the lines in the target entity; and calculating the charging power of the lines in the target entity based on the line voltage, angular frequency, and capacitance to ground of the lines in the target entity.

[0041] In the embodiments of the present application, by calculating the charging power of the lines in the target entity based on the line voltage, angular frequency, and capacitance to ground of the lines in the target entity, the accuracy and reliability of calculating the charging power of the lines in a wind farm and an energy storage power station can be improved.

[0042] In a feasible implementation manner, step 210 in the above embodiment, which calculates the reactive power loss of the transformers in the target entity, includes: obtaining the high-side voltage, active power, reactive power, rated capacity, percentage of no-load current, and nominal value of the transformer reactance of the transformers in the target entity; and calculating the reactive power loss of the transformers in the target entity based on the high-side voltage, active power, reactive power, rated capacity, percentage of no-load current, and nominal value of the transformer reactance of the transformers in the target entity.

[0043] In the embodiments of the present application, by calculating the charging power of the lines in the target entity based on the line voltage, angular frequency, and capacitance to ground of the lines in the target entity, the accuracy and reliability of calculating the charging power of the lines in a wind farm and an energy storage power station can be improved.

[0044] In a feasible implementation manner, step 230 in the above embodiment, which calculates the reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station, the reactive power loss and charging power of all lines in the target entity, and the reactive power loss of all transformers in the target entity, includes: calculating the capacitive reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station and the charging power of all lines in the target entity; calculating the inductive reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station, the reactive power loss of all lines in the target entity, and the reactive power loss of all transformers in the target entity; and taking the capacitive reactive power compensation configuration capacity to the inductive reactive power compensation configuration capacity as the reactive power compensation configuration capacity.

[0045] In the embodiments of the present application, by calculating the capacitive reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station and the charging power of all lines in the target main body, a relatively accurate capacitive reactive power compensation configuration capacity can be obtained; by calculating the inductive reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station, the reactive power loss of all lines in the target main body, and the reactive power loss of all transformers in the target main body, a relatively accurate inductive reactive power compensation configuration capacity can be obtained; and both the capacitive reactive power compensation configuration capacity and the inductive reactive power compensation configuration capacity use the regulation power of all energy storage converters in the energy storage power station for regulation, which can minimize the capacitive reactive power compensation configuration capacity and the inductive reactive power compensation configuration capacity, and further minimize the required reactive power compensation configuration capacity, so as to reduce the reactive power compensation configuration and cost, etc.

[0046] In a feasible implementation manner, step 220 in the above embodiment, calculating the regulation power of the energy storage converter in the energy storage power station, includes: Using the formula To calculate the regulation power of the energy storage converter in the energy storage power station; Wherein, Is the regulation power of the energy storage converter in the energy storage power station, Is the charging and discharging active power of the energy storage converter in the energy storage power station, Is the power factor of the energy storage converter in the energy storage power station.

[0047] In the embodiments of the present application, a rigorous calculation formula for the regulation power of the energy storage converter is provided from a mathematical perspective. From the rigor of the mathematical logic, the accuracy of the calculated regulation power of the energy storage converter can be ensured, and by preferably showing the calculation formula for the regulation power of the energy storage converter, it is convenient for technicians to provide reference, understanding, and calculation, etc.

[0048] In a feasible implementation manner, calculating the reactive power loss of the line in the target main body according to the line voltage, active power, reactive power, and line reactance of the line in the target main body in the above embodiment includes: Using the formula To calculate the reactive power loss of the line in the target main body; Wherein, Is the reactive power loss of the line in the target main body, Is the line reactance of the line in the target main body, Is the active power of the line in the target main body, Is the reactive power of the line in the target main body, Is the line voltage of the line in the target main body.

[0049] In the embodiments of the present application, a rigorous calculation formula for the reactive power loss of the line is provided from a mathematical perspective. The accuracy of the calculated reactive power loss of the line can be ensured from the rigor of mathematical logic, and the calculation formula for the reactive power loss of the line is preferably shown to facilitate reference, understanding, and calculation for technicians.

[0050] In a feasible implementation manner, calculating the charging power of the line in the target entity according to the line voltage, angular frequency, and capacitance to ground of the line in the above embodiments includes: Using the formula to calculate the charging power of the line in the target entity; wherein, is the charging power of the line in the target entity, is the line voltage of the line in the target entity, is the angular frequency of the line in the target entity, is the capacitance to ground of the line in the target entity.

[0051] In the embodiments of the present application, a rigorous calculation formula for the charging power of the line is provided from a mathematical perspective. The accuracy of the calculated charging power of the line can be ensured from the rigor of mathematical logic, and the calculation formula for the charging power of the line is preferably shown to facilitate reference, understanding, and calculation for technicians.

[0052] In a feasible implementation manner, calculating the reactive power loss of the transformer in the target entity according to the high-side voltage, active power, reactive power, rated capacity, no-load current percentage, and nominal value of the transformer reactance of the transformer in the above embodiments includes: Using the formula to calculate the reactive power loss of the transformer in the target entity; wherein, is the reactive power loss of the transformer in the target entity, is the nominal value of the transformer reactance of the transformer in the target entity, is the active power of the i-th transformer in the target entity, is the reactive power of the transformer in the target entity, is the high-side voltage of the transformer in the target entity, is the no-load current percentage of the transformer in the target entity, is the rated capacity of the transformer in the target entity.

[0053] In the embodiments of the present application, a rigorous calculation formula for the reactive power loss of a transformer is provided from a mathematical perspective. The accuracy of the calculated reactive power loss of the transformer can be ensured from the rigor of the mathematical logic, and the calculation formula for the reactive power loss of the transformer is preferably shown to facilitate reference, understanding, and calculation for technicians.

[0054] In a feasible implementation manner, calculating the capacitive reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station and the charging power of all lines in the target entity in the above embodiments includes: Using the formula To calculate the capacitive reactive power compensation configuration capacity; Calculating the inductive reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station, the reactive power loss of all lines in the target entity, and the reactive power loss of all transformers in the target entity in the above embodiments includes: Using the formula To calculate the inductive reactive power compensation configuration capacity; Wherein, ; In the above formula, Is the capacitive reactive power compensation configuration capacity, Is the sum of the regulation powers of all energy storage converters in the energy storage power station, Is the sum of the reactive power losses of all energy storage collector lines and all energy storage access lines in the energy storage power station, Is the sum of the reactive power losses of all energy storage step-up transformers in the energy storage power station, Is the sum of the reactive power losses of all wind power collector lines, all wind power submarine cable transmission lines, and all wind power land transmission lines in the wind farm, Is the sum of the reactive power losses of all wind turbine unit transformers and all wind power step-up transformers in the wind farm, Is the inductive reactive power compensation configuration capacity, Is the sum of the charging powers of all energy storage collector lines and all energy storage access lines in the energy storage power station, Is the sum of the charging powers of all wind power collector lines, all wind power submarine cable transmission lines, and all wind power land transmission lines in the wind farm, Is the sum of the charging powers of all wind power submarine cable transmission lines and all wind power land transmission lines in the wind farm, Is the regulation power of the rd energy storage converter in the energy storage power station, Is the reactive power loss of the th energy storage collector line in the energy storage power station, Is the reactive power loss of the th energy storage access line in the energy storage power station, Is the The reactive power loss of a energy storage step-up transformer is the reactive power loss of the th wind power collection line in the wind farm is the reactive power loss of the th wind power submarine cable outgoing line in the wind farm is the reactive power loss of the th wind power land outgoing line in the wind farm is the reactive power loss of the th wind turbine unit transformer in the wind farm is the reactive power loss of the th wind power step-up transformer in the wind farm is the charging power of the th energy storage collection line in the energy storage power station is the charging power of the th energy storage access line in the energy storage power station is the charging power of the th wind power collection line in the wind farm is the charging power of the th wind power submarine cable outgoing line in the wind farm is the charging power of the th wind power land outgoing line in the wind farm.

[0055] It should be noted that since there is no transformer between the wind power submarine cable outgoing line and the wind power land outgoing line in the wind farm, the line voltage, active power, reactive power, and line reactance of the lines are approximately equal. Therefore, the reactive power loss calculations of the wind power submarine cable outgoing line and the wind power land outgoing line can be unified into the reactive power loss calculation of the wind power outgoing line.

[0056] In the embodiments of the present application, formulas for calculating the capacitive reactive power compensation configuration capacity and the inductive reactive power compensation configuration capacity are provided from a mathematical perspective. From the rigor of the mathematical logic, the accuracy of the calculated capacitive reactive power compensation configuration capacity and inductive reactive power compensation configuration capacity can be ensured, and the formulas for calculating the capacitive reactive power compensation configuration capacity and the inductive reactive power compensation configuration capacity are preferably shown to facilitate reference, understanding, and calculation for technical personnel.

[0057] In some embodiments, the present application further provides a reactive power compensation configuration device.

[0058] Please refer to Figure 3 , which is a schematic diagram of a reactive power compensation configuration device in the embodiments of the present application. The device 310 includes: The reactive power loss and charging power calculation module 311 is used to calculate the reactive power loss and charging power of the lines in the target entity, and calculate the reactive power loss of the transformers in the target entity; The regulation power calculation module 312 is used to obtain the charge-discharge active power and power factor of the energy storage converters in the energy storage power station, so as to calculate the regulation power of the energy storage converters in the energy storage power station; The reactive power compensation calculation module 313 is used to calculate the reactive power compensation configuration capacity according to the regulation power of all the energy storage converters in the energy storage power station, the reactive power loss and charging power of all the lines in the target entity, and the reactive power loss of all the transformers in the target entity; The regulation module 314 is used to obtain the power factor regulation range of the energy storage converters in the energy storage power station, and evenly regulate the power factors of all the energy storage converters in the energy storage power station according to the power factor regulation range of the energy storage converters in the energy storage power station, so that the reactive power compensation configuration capacity reaches the minimum, and use the minimum reactive power compensation configuration capacity as the capacity of the reactive power compensation device to be configured; Wherein, the target entity includes a wind farm and an energy storage power station.

[0059] In the embodiment of the present application, the relevant content of the above-mentioned reactive power loss and charging power calculation module 311, regulation power calculation module 312, reactive power compensation calculation module 313 and regulation module 314 can be referred to Figure 2 the content in the shown embodiment, which will not be elaborated here.

[0060] It should be noted that the device 310 of the present application further includes some other modules. It can be understood that there is a one-to-one correspondence between the method of the present application and the device 310. Therefore, some other modules of the device 310 of the present application are the corresponding content of the method of the present application in the above embodiment.

[0061] In an embodiment of the present application, the reactive loss and charging power of the lines in the target subject are calculated, as well as the reactive loss of the transformer in the target subject; then the charging and discharging active power and power factor of the energy storage inverter in the energy storage power station are obtained to calculate the regulating power of the energy storage inverter in the energy storage power station, and then the reactive compensation configuration capacity is calculated according to the regulating power of all energy storage inverters in the energy storage power station, the reactive loss and charging power of all lines in the target subject, and the reactive loss of all transformers in the target subject; finally, the power factor adjustment range of the energy storage inverter in the energy storage power station is obtained, and the power factors of all energy storage inverters in the energy storage power station are equally adjusted according to the power factor adjustment range of the energy storage inverter in the energy storage power station. , so that the reactive compensation configuration capacity is minimized, and the minimum reactive compensation configuration capacity is used as the capacity of the reactive compensation device to be configured, wherein the target subjects include wind farms and energy storage power stations; that is: by utilizing the energy storage power station supporting the wind farm, considering the reactive compensation that the energy storage power station can provide, and adjusting the power factor of the energy storage converter in the energy storage power station, the reactive compensation configuration capacity is minimized, thereby reducing the reactive compensation configuration and reducing costs; in addition, by having the energy storage power station participate in the reactive power regulation of the wind farm, it is possible to effectively smooth out the power fluctuation of the wind farm, and improve the voltage level of the wind farm, improve the stability and safety of wind power grid connection, and increase the rate of return of the energy storage power station.

[0062] In some embodiments, the present application further provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor executes a reactive power compensation configuration method in the above method embodiment.

[0063] In some embodiments, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes a reactive power compensation configuration method in the above method embodiment.

[0064] Figure 4 The internal structure diagram of a computer device in some embodiments is shown. The computer device may be a terminal, a server, or a gateway. Figure 4 As shown, the computer device includes a processor, a memory and a network interface connected through a system bus.

[0065] The memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program. When the computer program is executed by the processor, the processor can implement each step in the above method embodiment. The internal memory may also store a computer program. When the computer program is executed by the processor, the processor can implement each step in the above method embodiment. Those skilled in the art can understand thatFigure 4 The structure shown is only a block diagram of some of the structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have a different component layout.

[0066] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods.

[0067] Among them, any reference to a memory, storage, database or other medium used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0068] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0069] The above-described embodiments merely represent several implementation manners of this application. Their descriptions are relatively specific and detailed, but should not be construed as a limitation on the patent scope of this application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application should be subject to the appended claims.

Claims

1. A reactive power compensation configuration method, characterized in that, The method includes: Calculating the reactive power loss and charging power of the lines in the target entity, and calculating the reactive power loss of the transformers in the target entity; Obtaining the charging and discharging active power and power factor of the energy storage converters in the energy storage power station to calculate the regulation power of the energy storage converters in the energy storage power station; Calculating the reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station, the reactive power loss and charging power of all lines in the target entity, and the reactive power loss of all transformers in the target entity; Obtaining the power factor regulation range of the energy storage converters in the energy storage power station, and evenly regulating the power factors of all energy storage converters in the energy storage power station according to the power factor regulation range of the energy storage converters in the energy storage power station, so that the reactive power compensation configuration capacity reaches the minimum, and taking the minimum reactive power compensation configuration capacity as the capacity of the reactive power compensation device to be configured; Wherein, the target entity includes a wind farm and the energy storage power station.

2. The method according to claim 1, wherein Calculating the reactive power loss of the lines in the target entity includes: Obtaining the line voltage, active power, reactive power and line reactance of the lines in the target entity; Calculating the reactive power loss of the lines in the target entity according to the line voltage, active power, reactive power and line reactance of the lines in the target entity.

3. The method according to claim 1, wherein Calculating the charging power of the lines in the target entity includes: Obtaining the line voltage, angular frequency and capacitance to ground of the lines in the target entity; Calculating the charging power of the lines in the target entity according to the line voltage, angular frequency and capacitance to ground of the lines in the target entity.

4. The method according to claim 1, wherein The calculating the reactive power loss of the transformers in the target entity includes: Obtaining the high-voltage side voltage, active power, reactive power, rated capacity, no-load current percentage and the nominal value of the transformer reactance of the transformers in the target entity; Calculating the reactive power loss of the transformers in the target entity according to the high-voltage side voltage, active power, reactive power, rated capacity, no-load current percentage and the nominal value of the transformer reactance of the transformers in the target entity.

5. The method according to claim 1, wherein, The calculating the reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station, the reactive power loss and charging power of all lines in the target entity, and the reactive power loss of all transformers in the target entity includes: Calculating the capacitive reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station and the charging power of all lines in the target entity; Calculating the inductive reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station, the reactive power loss of all lines in the target entity and the reactive power loss of all transformers in the target entity; Taking the capacitive reactive power compensation configuration capacity to the inductive reactive power compensation configuration capacity as the reactive power compensation configuration capacity.

6. The method according to claim 1, wherein The calculating the regulation power of the energy storage converters in the energy storage power station includes: Use the formula to calculate the regulation power of the energy storage converter in the energy storage power station; Wherein, is the regulated power of the energy storage converter in the energy storage power station, is the charging and discharging active power of the energy storage converter in the energy storage power station, is the power factor of the energy storage converter in the energy storage power station.

7. The method according to claim 2, wherein The calculating the reactive power loss of the lines in the target entity according to the line voltage, active power, reactive power and line reactance of the lines in the target entity includes: Use the formula to calculate the reactive power loss of the line in the target object; Among them, is the reactive power loss of the line in the target entity, is the line reactance of the line in the target entity, is the active power of the line in the target entity, is the reactive power of the line in the target entity, is the line voltage of the line in the target entity.

8. The method according to claim 3, characterized in that, Calculating the charging power of the line in the target entity according to the line voltage, angular frequency, and capacitance to ground of the line in the target entity includes: Use the formula to calculate the charging power of the circuit in the target object; Among them, is the charging power of the circuit in the target body, is the line voltage of the circuit in the target body, is the angular frequency of the circuit in the target body, is the capacitance to ground of the circuit in the target body.

9. The method according to claim 4, wherein Calculating the reactive power loss of the transformer in the target entity according to the high-side voltage, active power, reactive power, rated capacity, percentage of no-load current, and nominal value of the transformer reactance of the transformer in the target entity includes: Use the formula to calculate the reactive power loss of the transformer in the target object; Among them, is the reactive power loss of the transformer in the target entity, is the nominal value of the transformer reactance of the transformer in the target entity, is the active power of the i-th transformer in the target entity, is the reactive power of the transformer in the target entity, is the high-side voltage of the transformer in the target entity, is the no-load current percentage of the transformer in the target entity, is the rated capacity of the transformer in the target entity.

10. The method according to claim 5, characterized in that, Calculating the capacitive reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station and the charging power of all lines in the target entity includes: Using the formula to calculate the capacitive reactive power compensation configuration capacity; Calculating the inductive reactive power compensation configuration capacity according to the regulation power of all energy storage converters in the energy storage power station, the reactive power losses of all lines in the target entity, and the reactive power losses of all transformers in the target entity includes: Use the formula to calculate the configured capacity of the inductive reactive power compensation; Among them, ; In the above formula, is the capacitive reactive power compensation configured capacity, is the sum of the regulation powers of all energy storage converters in the energy storage power station, is the sum of the reactive power losses of all energy storage collector lines and all energy storage access lines in the energy storage power station, is the sum of the reactive power losses of all energy storage step-up transformers in the energy storage power station, is the sum of the reactive power losses of all wind power collector lines, all wind power submarine cable transmission lines and all wind power land transmission lines in the wind farm, is the sum of the reactive power losses of all wind turbine unit transformers and all wind power step-up transformers in the wind farm, is the inductive reactive power compensation configured capacity, is the sum of the charging powers of all energy storage collector lines and all energy storage access lines in the energy storage power station, is the sum of the charging powers of all wind power collector lines, all wind power submarine cable transmission lines and all wind power land transmission lines in the wind farm, is the sum of the charging powers of all wind power submarine cable transmission lines and all wind power land transmission lines in the wind farm, is the th regulation power of the energy storage converter in the energy storage power station, is the th reactive power loss of the energy storage collector line in the energy storage power station, is the th reactive power loss of the energy storage access line in the energy storage power station, is the th reactive power loss of the energy storage step-up transformer in the energy storage power station, is the th reactive power loss of the wind power collector line in the wind farm, is the th reactive power loss of the wind power submarine cable transmission line in the wind farm, is the th reactive power loss of the wind power land transmission line in the wind farm, is the th reactive power loss of the wind turbine unit transformer in the wind farm, is the th reactive power loss of the wind power step-up transformer in the wind farm, is the th charging power of the energy storage collector line in the energy storage power station, is the th charging power of the energy storage access line in the energy storage power station, be the charging power of the th wind power collector line in the wind farm station, be the charging power of the th wind power submarine cable transmission line in the wind farm station, be the charging power of the th wind power onshore transmission line in the wind farm station.

Images