Transformer area reactive power multi-target control method, device and equipment and medium

Abstract

The invention relates to a station area reactive power multi-target control method, device and equipment and a medium, and the method comprises the steps: obtaining the head end active power and the head end reactive power, and calculating the head end power factor; obtaining the input active power of the distribution transformer side to calculate the line loss, and calculating the power factor after the transformer area capacitance compensation according to the line loss condition; calculating the switching amount of a first parallel capacitor on the low-voltage side of the transformer area, and selecting a capacitor with a proper capacity as a switching object for switching; monitoring the power factor angle of the low-voltage side of the transformer in the transformer area after the capacitor is switched, and increasing the switching amount of the second parallel capacitor according to the monitoring condition; and when the capacity of the parallel capacitor at the low-voltage side cannot meet the requirement, calculating a reactive capacity gap, and bringing the distributed photovoltaic reactive regulation capacity in the transformer area into a regulation range. According to the invention, the line loss of the medium-voltage power transmission line is reduced, and meanwhile, the requirements of medium-voltage power transmission line head end and zone area operation power factors are met.

Description

Technical Field

[0001] The present invention relates to the technical field of substation control, and in particular to a method, device, equipment and medium for multi-objective control of reactive power in a substation. Background Art

[0002] In the context of the use of integrated terminal management and control in substations, how to comprehensively use cloud-pipe-edge control technology to optimize the operation mode of substations, reduce line losses of medium-voltage transmission lines by comprehensively adjusting reactive resources in the substations, and at the same time meet the requirements of the power factor at the head end of the medium-voltage transmission line and the substation operation has become an urgent problem to be solved. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a multi-objective control method, device, equipment and medium for reactive power in a substation area, which can reduce line losses of medium-voltage transmission lines while meeting the requirements of the operating power factor of the head end of the medium-voltage transmission line and the substation area.

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

[0005] Obtaining the active power and reactive power of the first end of the medium voltage side line of the distribution transformer in the substation from the main distribution station, and calculating the power factor of the first end of the medium voltage side line based on the active power and reactive power;

[0006] Obtain the input active power on the distribution transformer side, and calculate the line loss in combination with the head-end active power, and when the line loss exceeds the critical loss value, calculate the power factor of the head end of the medium voltage line after the transformer area capacitor compensation according to the line active loss reduction value;

[0007] 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 the substation capacitor compensation, 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;

[0008] Monitor the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched on, 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;

[0009] 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 capacity in the substation is included in the regulation range.

[0010] The power factor at the head end of the medium voltage line is It is calculated as follows: cosφ1 is the power factor at the head end of the medium voltage line, P1 is the active power at the head end, and Q1 is the reactive power at the head end.

[0011] The power factor of the medium voltage line head end after the transformer area capacitor compensation is calculated by Calculated, where cosφ2 is the power factor of the medium voltage line head end after the transformer area capacitor compensation, cosφ1 is the power factor of the medium voltage line head end, ΔP is the line loss, expressed as: ΔP = P1-P2, P1 is the head end active power, P2 is the input active power of the distribution transformer side, ΔP c is the loss critical value.

[0012] 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 the substation capacitor compensation, and the active power of the first end, the method further includes:

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

[0014] If the power factor of the head end of the medium voltage line 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 head end of the medium voltage line after compensation by the substation capacitor is set to the required power factor value of the medium voltage line sending end.

[0015] The switching amount of the first parallel capacitor ΔQ1=P1(tanφ1-tanφ2) is obtained by calculation, wherein ΔQ1 is the switching amount of the first parallel capacitor, φ1 is the power factor angle at the head end of the medium voltage line, φ2 is the power factor angle at the head end of the medium voltage line after the substation capacitor compensation, and P1 is the active power at the head end.

[0016] The monitoring capacitor is switched on and off after the low-voltage side power factor angle of the transformer in the substation, and the switching amount of the second parallel capacitor is increased according to the low-voltage side power factor angle of the transformer in the substation, specifically:

[0017] Determine whether the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched on exceeds the critical value of the power factor angle of the low-voltage side of the substation;

[0018] If the power factor angle of the low-voltage side of the transformer in the substation area after the capacitor is switched exceeds the critical value of the power factor angle of the low-voltage side of the substation area, the switching amount of the second parallel capacitor is increased, wherein the switching amount of the second parallel capacitor is calculated by ΔQ2=P1(tanφ3-tanφ c ) is calculated, ΔQ2 is the switching amount of the second parallel capacitor, φ3 is the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched, φ c is the critical value of the power factor angle on the low-voltage side of the substation, and P1 is the active power at the head end;

[0019] If the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched on 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.

[0020] The reactive capacity gap is calculated by ΔQ3=ΔQ1+ΔQ2-ΔQ c Calculated, where ΔQ3 is the reactive capacity gap, ΔQ1 is the switching capacity of the first parallel capacitor, ΔQ2 is the switching capacity of the second parallel capacitor, and ΔQ c is the total switching capacity of capacitors.

[0021] The above mentioned inclusion of the distributed photovoltaic reactive power regulation capability in the substation area into the regulation scope specifically includes:

[0022] According to the voltage monitoring results of each photovoltaic grid-connected point, all photovoltaic inverters whose voltages at distributed photovoltaic access points in the area do not exceed the limit are selected as the adjustment object group;

[0023] Sort the adjustment object group according to the remaining capacity of the inverter;

[0024] 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-connected point is close to the voltage upper limit.

[0025] The technical solution adopted by the present invention to solve the technical problem is: to provide a multi-objective control device for reactive power in a transformer area, comprising:

[0026] 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 of the head end;

[0027] The second acquisition calculation module is used to obtain the input active power of the distribution transformer side, and calculate the line loss in combination with the head end active power, and when the line loss exceeds the loss critical value, calculate the power factor of the head end of the medium voltage line after the transformer area capacitor compensation according to the line active loss reduction value;

[0028] 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 side line, the power factor of the first end of the medium-voltage line after the substation capacitor compensation, and the active power of the first end, and select a capacitor of appropriate capacity as a switching object for switching based on the switching amount of the first parallel capacitor on the low-voltage side of the substation;

[0029] 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;

[0030] 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 capacity in the substation into the regulation range.

[0031] The technical solution adopted by the present invention to solve its technical problem is: to provide an electronic device, including 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 above-mentioned multi-objective control method for reactive power of the substation when executing the computer program.

[0032] The technical solution adopted by the present invention to solve its technical problem is: providing a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned multi-objective control method of reactive power in the substation are implemented.

[0033] Beneficial Effects

[0034] Due to the adoption of the above-mentioned technical scheme, the present invention has the following advantages and positive effects compared with the prior art: the present invention fully utilizes the reactive capacity of the substation for regulation, reduces the power loss of the transmission line, meets the power factor requirements of the head end of the transmission line and the substation, and realizes reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flow chart of the multi-objective control method of reactive power in a substation according to the first embodiment of the present invention. DETAILED DESCRIPTION

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

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

[0038] Step 1: Obtain the active power P1 and reactive power Q1 of the medium voltage side line head end of the distribution transformer in the substation from the distribution master station, and calculate the power factor cosφ1 of the medium voltage side line head end based on the active power P1 and reactive power Q1, that is,

[0039] Step 2: Obtain the input active power P2 of the distribution transformer side, and calculate the line loss ΔP in combination with the head end active power P1, that is, ΔP = P1-P2, and when the line loss ΔP exceeds the loss critical value ΔP c When the power factor cosφ2 of the medium voltage line head end after the transformer area capacitor compensation is calculated according to the line active power loss reduction value, that is,

[0040] After completing step 2, first determine whether the power factor cosφ2 at the head end of the line after compensation by the substation capacitor is less than the required value β of the power factor at the sending end of the medium voltage line (which can be adjusted by referring to the national standard). If it is less than, that is, cosφ2<β, then the power factor of the head end of the medium voltage line after compensation by the substation capacitor is set to the required value of the power factor at the sending end of the medium voltage line, that is, cosφ2=β.

[0041] Step 3, calculate the switching amount ΔQ1 of the first parallel capacitor on the low-voltage side of the substation according to the power factor cosφ1 at the head end of the medium-voltage line, the power factor cosφ2 at the head end of the medium-voltage line after the substation capacitor compensation, and the active power P1 at the head end, and the calculation method is: ΔQ1 = P1 (tanφ1-tanφ2), and select a capacitor of appropriate capacity as the switching object based on the switching amount of the first parallel capacitor on the low-voltage side of the substation for switching. When switching, according to the capacitor grouping capacity, select a group of capacitors with a capacity closest to the switching amount ΔQ1 of the first parallel capacitor as the switching object for switching. When the capacitor capacity is less than the switching amount ΔQ1 of the first parallel capacitor, all capacitors are switched in.

[0042] Step 4, monitor the power factor angle φ3 of the low-voltage side of the transformer in the substation after the capacitor is switched on, and increase the switching amount of the second parallel capacitor according to the power factor angle φ3 of the low-voltage side of the transformer in the substation, specifically: determine whether the power factor angle φ3 of the low-voltage side of the transformer in the substation after the capacitor is switched on exceeds the critical value of the power factor angle φ3 of the low-voltage side of the substation c , if it exceeds, that is, φ3>φ c , then increase the switching capacity of the second parallel capacitor, where the switching capacity of the second parallel capacitor is calculated by ΔQ2=P1(tanφ3-tanφ c ) is calculated; if it does not exceed, then φ3≤φ c , no adjustment is made, that is, the switching amount of the second parallel capacitor is zero.

[0043] Step 5, determine whether the capacity of the low-voltage side parallel capacitor meets the switching capacity requirement, that is, determine whether 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. If it is lower, calculate the reactive capacity gap ΔQ3, and include the distributed photovoltaic reactive power regulation capability in the substation into the regulation range. The reactive capacity gap ΔQ3 is calculated as follows: ΔQ3 = ΔQ1 + ΔQ2 - ΔQc , ΔQ c is the total switching capacity of capacitors.

[0044] In this step, when the reactive power regulation capability of distributed photovoltaic power in the substation is included in the regulation range, it specifically includes: based on the voltage monitoring results of each photovoltaic grid-connected point, all photovoltaic inverters whose voltage at the distributed photovoltaic access point in the substation is not over the limit are selected as the regulation object group; the regulation object group is sorted according to the remaining capacity of the inverter; each inverter is adjusted in sequence until the switching capacity requirement is met or all photovoltaic inverters in the substation are regulated. During the adjustment, the reactive output of the inverter is increased, and the regulation of the inverter is terminated when it is adjusted to close to the inverter capacity or the inverter grid-connected point is close to the voltage upper limit.

[0045] It is not difficult to find that the present invention fully utilizes the reactive capacity of the substation for regulation, reduces the power loss of the transmission line, and at the same time meets the power factor requirements of the head end of the transmission line and the substation to achieve reliable operation.

[0046] The second embodiment of the present invention relates to a multi-objective control device for reactive power in a substation area, comprising:

[0047] 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 of the head end;

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

[0049] 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 side line, the power factor of the first end of the medium-voltage line after the substation capacitor compensation, and the active power of the first end, and select a capacitor of appropriate capacity as a switching object for switching based on the switching amount of the first parallel capacitor on the low-voltage side of the substation;

[0050] 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;

[0051] 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 capacity in the substation into the regulation range.

[0052] The first acquisition calculation module is Calculate the power factor at the head end of the medium voltage line, where cosφ1 is the power factor at the head end of the medium voltage line, P1 is the active power at the head end, and Q1 is the reactive power at the head end.

[0053] The second acquisition calculation module is Calculate the power factor of the medium voltage line head end after the transformer area capacitor compensation, where cosφ2 is the power factor of the medium voltage line head end after the transformer area capacitor compensation, cosφ1 is the power factor of the medium voltage side line head end, ΔP is the line loss, expressed as: ΔP = P1-P2, P1 is the head end active power, P2 is the input active power on the distribution transformer side, ΔP c is the loss critical value.

[0054] The multi-objective control device for reactive power in the substation area also includes:

[0055] A judgment module, used to judge whether the power factor of the head end of the medium voltage line after the transformer area capacitor compensation is less than the required value of the power factor of the sending end of the medium voltage line;

[0056] The correction module is used to make the power factor of the head end of the medium-voltage line after compensation by the substation capacitor be the required value of the power factor of the sending end of the medium-voltage line when the power factor of the head end of the medium-voltage line after compensation by the substation capacitor is less than the required value of the power factor of the sending end of the medium-voltage line.

[0057] The switching module calculates the switching amount of the first parallel capacitor by ΔQ1=P1(tanφ1-tanφ2), wherein ΔQ1 is the switching amount of the first parallel capacitor, φ1 is the power factor angle at the head end of the medium voltage line, φ2 is the power factor angle at the head end of the medium voltage line after the substation capacitor compensation, and P1 is the active power at the head end.

[0058] The switching increase module includes:

[0059] A judgment unit, used to judge whether the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched on exceeds the critical value of the power factor angle of the low-voltage side of the substation;

[0060] The adding unit is used to increase the switching amount of the second parallel capacitor when 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, wherein the switching amount of the second parallel capacitor is calculated by ΔQ2=P1(tanφ3-tanφ c ) is calculated, ΔQ2 is the switching amount of the second parallel capacitor, φ3 is the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched, φ c is the critical value of the power factor angle on the low-voltage side of the substation, and P1 is the active power at the head end;

[0061] The setting unit is used to set the switching amount of the second parallel capacitor to zero when the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched does not exceed the critical value of the power factor angle of the low-voltage side of the substation.

[0062] The photovoltaic regulation module is through ΔQ3 = ΔQ1 + ΔQ2 - ΔQ c Calculate the reactive capacity gap, where ΔQ3 is the reactive capacity gap, ΔQ1 is the switching capacity of the first parallel capacitor, ΔQ2 is the switching capacity of the second parallel capacitor, and ΔQ c It is the total switching of capacitors.

[0063] The photovoltaic regulation module comprises:

[0064] A screening unit is used to screen out all photovoltaic inverters whose voltages of distributed photovoltaic access points in the platform area are within the voltage limit as the adjustment object group according to the voltage monitoring results of each photovoltaic grid-connected point;

[0065] A sorting unit sorts the adjustment object group according to the remaining capacity of the inverter;

[0066] The regulating unit is used to sequentially regulate each inverter until the switching capacity requirement is met or all photovoltaic inverters in the substation area have completed regulation; during regulation, the reactive output of the inverter is increased, and the regulation of the inverter is terminated when it is adjusted to 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 invention relates to an electronic device, including 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 in a substation of the first embodiment when executing the computer program.

[0068] The fourth embodiment of the present invention relates to a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the multi-objective control method for reactive power in a substation area of ​​the first embodiment are implemented.

[0069] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0070] The present application is described with reference to the 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 process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, 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 device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0071] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device 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 is implemented in the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0072] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0073] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A multi-objective control method for reactive power in an area, characterized in that: The following steps are involved: Obtaining the active power and reactive power of the first end of the medium voltage side line of the distribution transformer in the substation from the main distribution station, and calculating the power factor of the first end of the medium voltage side line 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, and when the line loss exceeds the critical loss value, calculate the power factor of the head end of the medium voltage line after the transformer area capacitor compensation according to the line active loss reduction value; 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 the substation capacitor compensation, 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; Monitor the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched on, 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 capacity 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 line is It is calculated as follows: cosφ1 is the power factor at the head end of the medium voltage line, P1 is the active power at the head end, and Q1 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 transformer area capacitor compensation is calculated by Calculated, where cosφ2 is the power factor of the medium voltage line head end after the transformer area capacitor compensation, cosφ1 is the power factor of the medium voltage line head end, ΔP is the line loss, expressed as: ΔP = P1-P2, P1 is the head end active power, P2 is the input active power of the distribution transformer side, ΔP c is the loss critical value.

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 the substation capacitor compensation, and the active power of the first end, the method further includes: Determine whether the power factor of the head end of the medium voltage line after the transformer area capacitor compensation is less than the required value of the power factor of the sending end of the medium voltage line; If the power factor of the head end of the medium voltage line 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 head end of the medium voltage line 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 amount of the first parallel capacitor ΔQ1=P1(tanφ1-tanφ2) is obtained by calculation, wherein ΔQ1 is the switching amount of the first parallel capacitor, φ1 is the power factor angle at the head end of the medium voltage line, φ2 is the power factor angle at the head end of the medium voltage line after the substation capacitor compensation, and P1 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 capacitor is switched on and off after the low-voltage side power factor angle of the transformer in the substation, and the switching amount of the second parallel capacitor is increased according to the low-voltage side power factor angle of the transformer in the substation, specifically: Determine whether the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched on exceeds the critical value of the power factor angle of the low-voltage side of the substation; If the power factor angle of the low-voltage side of the transformer in the substation area after the capacitor is switched exceeds the critical value of the power factor angle of the low-voltage side of the substation area, the switching amount of the second parallel capacitor is increased, wherein the switching amount of the second parallel capacitor is calculated by ΔQ2=P1(tanφ3-tanφ c ) is calculated, ΔQ2 is the switching amount of the second parallel capacitor, φ3 is the power factor angle of the low-voltage side of the transformer in the substation after the capacitor is switched, φ c is the critical value of the power factor angle on the low-voltage side of the substation, and P1 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 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 by ΔQ3=ΔQ1+ΔQ2-ΔQ c Calculated, where ΔQ3 is the reactive capacity gap, ΔQ1 is the switching capacity of the first parallel capacitor, ΔQ2 is the switching capacity of the second parallel capacitor, and ΔQ c is the total switching capacity of capacitors.

8. The multi-objective control method for reactive power in a substation area according to claim 1, characterized in that: The above mentioned inclusion of the distributed photovoltaic reactive power regulation capability in the substation area into the regulation scope specifically includes: According to the voltage monitoring results of each photovoltaic grid-connected point, all photovoltaic inverters whose voltages at distributed photovoltaic access points in the area do not exceed the limit are selected as the adjustment object 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-connected 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 of the head end; The second acquisition calculation module is used to obtain the input active power of the distribution transformer side, and calculate the line loss in combination with the head end active power, and when the line loss exceeds the loss critical value, calculate the power factor of the head end of the medium voltage line after the transformer area capacitor compensation according to the line active loss reduction 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 side line, the power factor of the first end of the medium-voltage line after the substation capacitor compensation, and the active power of the first end, and select a capacitor of appropriate capacity as a 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 capacity 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, characterized in that: When the processor executes the computer program, the steps of the multi-objective control method for reactive power in an area as described in any one of claims 1-9 are implemented.

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 9 are implemented.

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