A transformer area reactive power multi-objective control method, device, equipment and medium

Abstract

The present application relates to a kind of district reactive power multi-objective control method, device, equipment and medium, wherein, method includes: obtaining first active power and first reactive power, and calculating first power factor;Obtain distribution transformer side input active power to calculate line loss, and according to line loss situation, calculate the power factor after being compensated by district capacitor;Calculate the switching amount of first shunt capacitor in low-voltage side of district, and select the capacitor with appropriate capacity as switching object to switch;Monitor the power factor angle of district transformer low-voltage side after capacitor switching, and according to monitoring situation, increase the switching amount of second shunt capacitor;When the capacity of shunt capacitor in low-voltage side cannot meet the demand, calculate the gap of reactive power capacity, and include the regulation range of distributed photovoltaic reactive power regulation capability in district.The present application meets the requirements of first end and district operating power factor of medium-voltage transmission line while reducing the line loss of medium-voltage transmission line.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformer area management and control, in particular to a transformer area reactive power multi-objective control method, device, equipment and medium. BACKGROUND

[0002] Under the background of using fusion terminal management and control in transformer areas, how to comprehensively use cloud management edge control technology to optimize the operation mode of transformer areas, and through comprehensive adjustment of reactive power resources in transformer areas, reduce the line loss of medium voltage transmission lines, and at the same time meet the requirements of the power factor of the first end of the medium voltage transmission line and the operation of the transformer area, has become a problem to be solved. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a transformer area reactive power multi-objective control method, device, equipment and medium, which reduces the line loss of medium voltage transmission lines and meets the requirements of the power factor of the first end of the medium voltage transmission line and the operation of the transformer area.

[0004] The technical solution adopted by the present application to solve the technical problem is to provide a transformer area reactive power multi-objective control method, comprising the following steps:

[0005] Obtain the active power and the first end reactive power of the medium voltage side line of the transformer area power distribution transformer from the power distribution master station, and calculate the power factor of the first end of the medium voltage side line based on the first end active power and the first end reactive power;

[0006] Obtain the input active power of the transformer side, and calculate the line loss in combination with the first end active power, and when the line loss exceeds the loss threshold, calculate the power factor of the first end of the medium voltage line after the capacitor compensation of the transformer area according to the difference between the line loss and the loss threshold;

[0007] According to the power factor of the first end of the medium voltage side line, the power factor of the first end of the medium voltage line after the capacitor compensation of the transformer area, and the first end active power, calculate the first shunt capacitor switching amount of the low voltage side of the transformer area, and select the capacitor with appropriate capacity as the switching object based on the first shunt capacitor switching amount of the low voltage side of the transformer area.

[0008] Monitor the power factor angle of the low voltage side of the transformer after the capacitor is switched, and increase the second shunt capacitor switching amount according to the power factor angle of the low voltage side of the transformer;

[0009] When the capacity of the low voltage side shunt capacitor is lower than the sum of the first shunt capacitor switching amount and the second shunt capacitor switching amount, calculate the reactive power capacity gap, and include the distributed photovoltaic reactive power regulation capacity in the transformer area into the regulation range.

[0010] The power factor of the first end of the medium voltage side line is calculated by , wherein, is the power factor of the first end of the medium voltage side line, the active power at the head end, the reactive power at the head end.

[0011] The power factor of the medium-voltage line head end after capacitor compensation in the transformer area is calculated by , wherein, the power factor of the medium-voltage line head end after capacitor compensation in the transformer area, the power factor of the line head end on the medium-voltage side, the line loss, which is expressed as: , the active power at the head end, the active power input on the side of the distribution transformer, the loss threshold value.

[0012] Before the calculation of the first shunt capacitor switching amount on the low-voltage side of the transformer area according to the power factor of the line head end on the medium-voltage side, the power factor of the medium-voltage line head end after capacitor compensation in the transformer area, and the active power at the head end, the method further comprises:

[0013] determining whether the power factor of the medium-voltage line head end after capacitor compensation in the transformer area is less than the power factor requirement value of the sending end of the medium-voltage line;

[0014] If the power factor of the medium-voltage line head end after capacitor compensation in the transformer area is less than the power factor requirement value of the sending end of the medium-voltage line, the power factor of the medium-voltage line head end after capacitor compensation in the transformer area is set to the power factor requirement value of the sending end of the medium-voltage line.

[0015] The first shunt capacitor switching amount is calculated by , wherein, the first shunt capacitor switching amount, the power factor angle of the line head end on the medium-voltage side, the power factor angle of the medium-voltage line head end after capacitor compensation in the transformer area, the active power at the head end.

[0016] The method further comprises:

[0017] determining whether the power factor angle of the transformer low-voltage side after capacitor switching exceeds the critical value of the power factor angle on the low-voltage side of the transformer area;

[0018] If the power factor angle of the transformer low-voltage side after capacitor switching exceeds the critical value of the power factor angle on the low-voltage side of the transformer area, the second shunt capacitor switching amount is increased, wherein the second shunt capacitor switching amount is calculated by , the second shunt capacitor switching amount, a power factor angle of a low-voltage side of a transformer in a distribution area after the capacitor is switched in, a critical value of the power factor angle of the low-voltage side of the distribution area, active power at a head end,

[0019] If the power factor angle of the low-voltage side of the transformer in the distribution area after the capacitor is switched in does not exceed the critical value of the power factor angle of the low-voltage side of the distribution area, the second shunt capacitor switching-in amount is zero.

[0020] The reactive power capacity gap is calculated by , wherein, is the reactive power capacity gap, is the first shunt capacitor switching-in amount, is the second shunt capacitor switching-in amount, is the total capacitor switching-in amount.

[0021] The distributed photovoltaic reactive power regulation capability in the distribution area is included in the regulation range, and specifically includes:

[0022] According to the voltage monitoring results of each photovoltaic grid-connected point, all photovoltaic inverters in the distribution area whose voltage does not exceed the limit are selected as a regulation object group;

[0023] The regulation object group is sorted according to the residual capacity of the inverters;

[0024] Each inverter is sequentially regulated until the switching-in capacity requirement is met or all photovoltaic inverters in the distribution area are regulated; during the regulation, the reactive power output of the inverter is increased, and the regulation of the inverter is terminated when the regulation is close to the capacity of the inverter or the grid-connected point of the inverter is close to the upper limit of the voltage.

[0025] The technical solution adopted by the present application to solve its technical problems is: a distribution area reactive power multi-target control device is provided, comprising:

[0026] A first acquisition and calculation module is configured to acquire active power and reactive power at a head end of a medium-voltage side line of a distribution transformer from a distribution main station, and calculate a power factor at the head end of the medium-voltage side line based on the active power and the reactive power at the head end;

[0027] A second acquisition and calculation module is configured to acquire input active power at the side of the distribution transformer, calculate line loss in combination with the active power at the head end, and when the line loss exceeds a loss critical value, calculate a power factor at the head end of the medium-voltage line after capacitor compensation in the distribution area according to a difference between the line loss and the loss critical value;

[0028] A switching module is configured to calculate a switching amount of a first shunt capacitor on a low-voltage side of a transformer in a substation according to a power factor of a first end of a medium-voltage line, a power factor of the first end of the medium-voltage line after compensation by a capacitor in the substation, and an active power of the first end, and select a capacitor with a proper capacity as a switching object based on the switching amount of the first shunt capacitor on the low-voltage side of the transformer in the substation.

[0029] A switching increasing module is configured to monitor a power factor angle of the low-voltage side of the transformer in the substation after the switching of the capacitor, and increase a switching amount of a second shunt capacitor according to the power factor angle of the low-voltage side of the transformer in the substation.

[0030] A photovoltaic adjusting module is configured to calculate a gap of reactive power capacity when a capacity of the shunt capacitor on the low-voltage side is less than a sum of the switching amount of the first shunt capacitor and the switching amount of the second shunt capacitor, and include a distributed photovoltaic reactive power adjusting capacity in the substation into an adjusting range.

[0031] The technical solution adopted by the present application to solve the technical problem is to provide an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the substation reactive power multi-target control method when executing the computer program.

[0032] The technical solution adopted by the present application to solve the technical problem is to provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program is executable by a processor to implement the steps of the substation reactive power multi-target control method.

[0033] Advantages

[0034] Compared with the prior art, the present application has the following advantages and positive effects: the present application fully utilizes the reactive power capacity of the substation for adjustment, reduces the power loss of the transmission line, meets the power factor requirements of the first end of the transmission line and the substation, and realizes reliable operation. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a flowchart of the substation reactive power multi-target control method of the first embodiment of the present application. DETAILED DESCRIPTION

[0036] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. Furthermore, it should be understood that those skilled in the art can make various modifications or changes to the present application after reading the content taught by the present application, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0037] The first embodiment of the present application relates to a substation reactive power multi-target control method, as shown in Figure 1As shown, the following steps are included:

[0038] Step 1: Obtain the active power of the medium voltage side line head end of the distribution transformer in the substation from the distribution master station and the first-end reactive power , and based on the head-end active power and the first-end reactive power Calculate the power factor at the head end of the medium voltage line ,Right now .

[0039] Step 2: Get the input active power of the distribution transformer , and combined with the head-end active power Calculating line loss ,Right now , and line losses Exceeding the loss threshold When the power factor of the medium voltage line head end after the transformer area capacitor compensation is calculated based on the difference between the line loss and the loss critical value ,Right now .

[0040] After completing step 2, first determine the power factor of the line head end after the station capacitor compensation Is it less than the required power factor value at the sending end of the medium voltage line? (You can refer to the national standard to adjust it yourself), if it is less than , then let the power factor of the medium voltage line head end after the transformer area capacitor compensation be the required value of the medium voltage line sending end power factor, that is, .

[0041] Step 3: According to the power factor of the first end of the medium voltage side line , the power factor of the medium voltage line head end after the transformer area capacitor compensation and the first-end active power Calculate the switching capacity of the first shunt capacitor on the low-voltage side of the transformer area , calculated as: , and based on the switching capacity of the first parallel capacitor on the low-voltage side of the substation, select a capacitor with appropriate capacity as the switching object for switching. When switching, according to the capacitor group capacity, select a capacitor with the same capacity as the switching capacity of the first parallel capacitor. The closest group of capacitors is used as the switching object for switching. When the capacitor capacity is less than the switching capacity of the first parallel capacitor, When , all capacitors are put into operation.

[0042] Step 4: Monitor the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched on and off. , and according to the power factor angle of the low voltage side of the transformer in the station area Increase the second parallel capacitor switching amount, specifically: judge the low-voltage side power factor angle of the transformer after the capacitor is switched Whether the low-voltage side power factor angle of the transformer exceeds the critical value If it exceeds, that is Then increase the second parallel capacitor switching amount, wherein the second parallel capacitor switching amount is calculated by If it does not exceed, that is No adjustment is made, that is, the second parallel capacitor switching amount is zero.

[0043] Step 5, judge whether the low-voltage side parallel capacitor capacity meets the switching capacity requirement, that is, whether the low-voltage side parallel capacitor capacity is lower than the sum of the first parallel capacitor switching amount and the second parallel capacitor switching amount, if it is lower, calculate the reactive power capacity gap And include the distributed photovoltaic reactive power regulation capability in the regulation range, wherein the calculation method of the reactive power capacity gap Is as follows: , Is the total switching amount of the capacitor.

[0044] When the distributed photovoltaic reactive power regulation capability in the transformer area is included in the regulation range in this step, it specifically includes: according to the voltage monitoring results of each photovoltaic grid-connected point, all photovoltaic inverters with voltage not exceeding the limit in the transformer area are selected as the regulation object group; the regulation object group is sorted according to the remaining capacity of the inverters; each inverter is adjusted in turn until the switching capacity requirement is met or all photovoltaic inverters in the transformer area are adjusted, and when adjusting, the reactive power output of the inverter is increased, and the adjustment of the inverter is terminated when the inverter capacity is close to the limit or the voltage of the inverter grid-connected point is close to the upper limit.

[0045] It can be found that the present application fully utilizes the reactive power capacity of the transformer area for regulation, reduces the power loss of the transmission line, meets the power factor requirements of the head of the transmission line and the transformer area, and realizes reliable operation.

[0046] The second embodiment of the present application relates to a transformer area reactive power multi-target control device, comprising:

[0047] A first acquisition and calculation module is used to acquire the active power and the reactive power at the head of the medium-voltage side line of the transformer area distribution transformer from the distribution main station, and calculate the power factor at the head of the medium-voltage side line based on the active power and the reactive power;

[0048] A second acquisition and calculation module is used to acquire the input active power at the side of the distribution transformer, calculate the line loss in combination with the active power, and calculate the power factor at the head of the medium-voltage line after the capacitor compensation of the transformer area when the line loss exceeds the loss critical value according to the difference between the line loss and the loss critical value;

[0049] A switching module is configured to calculate a first shunt capacitor switching amount according to a medium-voltage side line head power factor, a medium-voltage line head power factor after a substation capacitor compensation, and a head active power, and select a capacitor with a proper capacity as a switching object based on the first shunt capacitor switching amount for switching;

[0050] A switching increasing module is configured to monitor a substation transformer low-voltage side power factor angle after the capacitor switching, and increase a second shunt capacitor switching amount according to the substation transformer low-voltage side power factor angle;

[0051] A photovoltaic adjustment module is configured to calculate a reactive power capacity gap when a low-voltage side shunt capacitor capacity is lower than a sum of the first shunt capacitor switching amount and the second shunt capacitor switching amount, and include a distributed photovoltaic reactive power adjustment capacity in a substation into an adjustment range.

[0052] The first acquisition and calculation module is configured to calculate a medium-voltage side line head power factor, wherein, the medium-voltage side line head power factor is, the head active power is, the head reactive power is.

[0053] The second acquisition and calculation module is configured to calculate a medium-voltage line head power factor after a substation capacitor compensation, wherein, the medium-voltage line head power factor after the substation capacitor compensation is, the medium-voltage side line head power factor is, the line loss is represented as: , the head active power is, the distribution transformer side input active power is, the loss critical value is.

[0054] The substation reactive power multi-objective control device further comprises:

[0055] A judgment module is configured to judge whether the medium-voltage line head power factor after the substation capacitor compensation is less than a medium-voltage line sending end power factor requirement value;

[0056] A correction module is configured to, when the medium-voltage line head power factor after the substation capacitor compensation is less than the medium-voltage line sending end power factor requirement value, make the medium-voltage line head power factor after the substation capacitor compensation the medium-voltage line sending end power factor requirement value.

[0057] The switching module is configured to calculate the first shunt capacitor switching amount, wherein, The first shunt capacitor switching amount, The medium voltage side line head power factor angle, The medium voltage line head power factor angle after the capacitor compensation in the transformer substation, The head active power.

[0058] The switching increasing module comprises:

[0059] A judging unit is configured to judge whether the transformer substation low voltage side power factor angle after the capacitor switching exceeds the transformer substation low voltage side power factor angle threshold value;

[0060] An increasing unit is configured to increase the second shunt capacitor switching amount when the transformer substation low voltage side power factor angle after the capacitor switching exceeds the transformer substation low voltage side power factor angle threshold value, wherein the second shunt capacitor switching amount is calculated by , The second shunt capacitor switching amount, The transformer substation low voltage side power factor angle after the capacitor switching, The transformer substation low voltage side power factor angle threshold value, The head active power.

[0061] A setting unit is configured to set the second shunt capacitor switching amount to zero when the transformer substation low voltage side power factor angle after the capacitor switching does not exceed the transformer substation low voltage side power factor angle threshold value.

[0062] The photovoltaic regulation module calculates the reactive power capacity gap by , wherein, The reactive power capacity gap, The first shunt capacitor switching amount, The second shunt capacitor switching amount, The total capacitor switching.

[0063] The photovoltaic regulation module comprises:

[0064] A screening unit is configured to screen all photovoltaic inverters with the voltage not exceeding the limit in the transformer substation as the regulation object group according to the voltage monitoring results of each photovoltaic grid-connected point.

[0065] A sorting unit sorts the regulation object group according to the remaining capacity of the inverters.

[0066] A regulation unit is configured to sequentially regulate each inverter until the switching capacity requirement is met or all photovoltaic inverters in the transformer substation are regulated. When regulating, the reactive power output of the inverter is increased, and the regulation of the inverter is terminated when the regulation is close to the inverter capacity or the inverter grid-connected point is close to the voltage upper limit.

[0067] The third embodiment of the present application relates to an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the multi-objective control method for reactive power of a transformer area of the first embodiment when executing the computer program.

[0068] The fourth embodiment of the present application relates to a computer readable storage medium, which stores a computer program, wherein the computer program implements the steps of the multi-objective control method for reactive power of a transformer area of the first embodiment when executed by a processor.

[0069] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk memory and optical memory, etc.) containing computer-usable program code.

[0070] The present application is described with reference to flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device that implements the flow Figure 1 The function of one flow or multiple flows and / or blocks Figure 1 The function of one block or multiple blocks.

[0071] These computer program instructions can also be stored in a computer-readable memory capable of guiding a computer or other programmable data processing devices to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction method, which implements the flow Figure 1 The function of one flow or multiple flows and / or blocks Figure 1 The function of one block or multiple blocks.

[0072] These computer program instructions can also be loaded into a computer or other programmable data processing device, so that a series of operation steps are performed on the computer or other programmable data processing device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide a process for implementing the flow Figure 1 The function of one flow or multiple flows and / or blocks Figure 1steps of the functions specified in the block or blocks.

[0073] The above description is merely that of a specific implementation of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, and all such changes or replacements should be encompassed within the scope of protection of the present application. Therefore, the scope of protection of the present application should be subject to the scope of protection of the claims.

Claims

1. A multi-objective control method for reactive power in a substation, characterized in that: The following steps are involved: Obtain the active power and reactive power of the medium voltage side line head end of the distribution transformer in the substation from the power distribution master station, and calculate the power factor of the medium voltage side line head end based on the active power and reactive power; Obtain the input active power on the distribution transformer side, and calculate the line loss in combination with the head-end active power. When the line loss exceeds the loss critical value, calculate the power factor of the medium voltage line head end after the substation capacitor compensation based on the difference between the line loss and the loss critical value; Calculate the switching capacity of the first parallel capacitor on the low-voltage side of the substation according to the power factor of the first end of the medium-voltage line, the power factor of the first end of the medium-voltage line after compensation by the substation capacitor, and the active power of the first end, and select a capacitor with appropriate capacity as the switching object for switching based on the switching capacity of the first parallel capacitor on the low-voltage side of the substation; Monitor the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched on and off, and increase the switching amount of the second parallel capacitor according to the power factor angle of the low-voltage side of the transformer in the substation; When the capacity of the low-voltage side parallel capacitor is lower than the sum of the switching capacity of the first parallel capacitor and the switching capacity of the second parallel capacitor, the reactive capacity gap is calculated, and the distributed photovoltaic reactive power regulation capability in the substation is included in the regulation range.

2. The multi-objective control method for reactive power in a substation area according to claim 1, characterized in that: The power factor of the first end of the medium voltage side line is Calculated, where is the power factor at the first end of the medium voltage line, is the active power at the head end, is the reactive power at the head end.

3. The multi-objective control method for reactive power in a substation area according to claim 1, characterized in that: The power factor of the medium voltage line head end after the power factor compensation of the substation capacitor is Calculated, where is the power factor at the head end of the medium voltage line after compensation by the substation capacitor. is the power factor at the first end of the medium voltage line, is the line loss, expressed as: , is the active power at the head end, Input active power to the distribution transformer side, is the loss threshold.

4. The multi-objective control method for reactive power in a substation area according to claim 1, characterized in that: Before calculating the switching amount of the first parallel capacitor on the low-voltage side of the substation according to the power factor of the first end of the medium-voltage line, the power factor of the first end of the medium-voltage line after compensation by the substation capacitor, and the active power of the first end, the method further includes: Determine whether the power factor of the medium voltage line head end after the transformer area capacitor compensation is less than the required power factor value of the medium voltage line sending end; If the power factor of the medium-voltage line head end after compensation by the substation capacitor is less than the required power factor value of the medium-voltage line sending end, the power factor of the medium-voltage line head end after compensation by the substation capacitor is set to the required power factor value of the medium-voltage line sending end.

5. The multi-objective control method for reactive power in a substation area according to claim 1, characterized in that: The switching capacity of the first parallel capacitor By calculation, we get: is the switching capacity of the first parallel capacitor, is the power factor angle at the head end of the medium voltage line, is the power factor angle at the head end of the medium voltage line after the transformer capacitor compensation, is the active power at the head end.

6. The multi-objective control method for reactive power in a substation area according to claim 1, characterized in that: The monitoring of the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched, and increasing the switching amount of the second parallel capacitor according to the power factor angle of the low-voltage side of the transformer in the substation, is specifically as follows: Determine whether the power factor angle of the low-voltage side of the transformer in the substation exceeds the critical value of the power factor angle of the low-voltage side of the substation after the capacitor is switched on and off; If the power factor angle of the low-voltage side of the transformer in the substation exceeds the critical value of the power factor angle of the low-voltage side of the substation after the capacitor is switched, the switching amount of the second parallel capacitor is increased, wherein the switching amount of the second parallel capacitor is determined by Calculated, is the switching capacity of the second parallel capacitor, is the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched on and off. is the critical value of the power factor angle on the low-voltage side of the substation, is the active power at the head end; If the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched on and off does not exceed the critical value of the power factor angle of the low-voltage side of the substation, the switching amount of the second parallel capacitor is zero.

7. The multi-objective control method for reactive power in a substation area according to claim 1, characterized in that: The reactive capacity gap is Calculated, where is the reactive capacity gap, is the switching capacity of the first parallel capacitor, is the switching capacity of the second parallel capacitor, is the total switching capacity of the capacitor.

8. The multi-objective control method for reactive power in a substation area according to claim 1, characterized in that: Including the distributed photovoltaic reactive power regulation capability within the substation into the regulation scope specifically includes: Based on the voltage monitoring results of each photovoltaic grid-connected point, all photovoltaic inverters whose voltages at distributed photovoltaic access points within the platform area do not exceed the limit are selected as the adjustment target group; Sort the adjustment object group according to the remaining capacity of the inverter; Adjust each inverter in sequence until the switching capacity requirements are met or all photovoltaic inverters in the substation have completed adjustment; during adjustment, increase the reactive output of the inverter, and terminate the adjustment of the inverter when it is adjusted to close to the inverter capacity or the inverter grid connection point is close to the voltage upper limit.

9. A multi-objective control device for reactive power in a substation area, characterized in that: include: The first acquisition calculation module is used to obtain the active power and reactive power of the medium-voltage side line head end of the distribution transformer in the substation from the power distribution master station, and calculate the power factor of the medium-voltage side line head end based on the active power and reactive power; The second acquisition calculation module is used to obtain the input active power on the distribution transformer side, and calculate the line loss in combination with the head-end active power. When the line loss exceeds the loss critical value, the power factor of the head end of the medium voltage line after the substation capacitor compensation is calculated according to the difference between the line loss and the loss critical value; A switching module is used to calculate the switching amount of the first parallel capacitor on the low-voltage side of the substation according to the power factor of the first end of the medium-voltage line, the power factor of the first end of the medium-voltage line after compensation by the substation capacitor, and the active power of the first end, and select a capacitor of appropriate capacity as the switching object for switching based on the switching amount of the first parallel capacitor on the low-voltage side of the substation; The switching increase module is used to monitor the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched, and increase the switching amount of the second parallel capacitor according to the power factor angle of the low-voltage side of the transformer in the substation; The photovoltaic regulation module is used to calculate the reactive capacity gap when the capacity of the low-voltage side parallel capacitor is lower than the sum of the switching capacity of the first parallel capacitor and the switching capacity of the second parallel capacitor, and to include the distributed photovoltaic reactive power regulation capability in the substation into the regulation range.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the multi-objective control method for reactive power in a substation are implemented as claimed in any one of claims 1 to 8.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the multi-objective control method for reactive power in an area as claimed in any one of claims 1 to 8 are implemented.

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