Method and system for configuring differentiated reactive power compensation device with access of large number of cables

Abstract

The invention discloses a method and a system for configuring a differentiated reactive power compensation device accessed by a large number of cables. The method comprises the following steps of: determining basic information and incoming and outgoing cable parameters of a transformer substation; calculating a power factor during peak load and a power factor during valley load of the transformer substation, and analyzing a reactive power compensation device needing to be configured; the method comprises the following steps: calculating a capacitive reactive power compensation value and an inductive reactive power compensation value required by a transformer substation through iterative calculation, calculating compensated power factors during peak load and valley load, recording the corresponding capacitive reactive power compensation value and inductive reactive power compensation value before and after the compensated power factors reach the standard, and carrying out interpolation calculation on the values, and obtaining the reactive configuration capacity of the reactive compensation device needing to be configured. According to the technical scheme, the influence of access of a large number of cables on the reactive power of the power distribution network under the novel power system can be considered, so that the capacity of the reactive power compensation device is more reasonably configured, and stable and economical operation of the urban novel power system is supported.

Description

Technical Field

[0001] The present invention belongs to the technical field of reactive power compensation for distribution networks, and in particular relates to a method and system for configuring a differentiated reactive power compensation device for access of a large number of cables. Background Art

[0002] As the link in the power system that is directly connected to users, the stability of the distribution network is receiving more and more attention. With the continuous increase in the load level of the power grid and the continuous increase in the voltage level, the load in the power system is becoming increasingly heavier, especially in cities and industrial areas. The access of a large number of cables has put the stability and efficiency of the power system at great risk.

[0003] Compared with overhead lines, cables have the advantages of low impedance, no environmental impact, high reliability, and can greatly improve the appearance of the city. However, compared with overhead lines, cables have a larger capacitance to the ground, and generate capacitive reactive power under the action of AC voltage, that is, reactive charging power for the system. Its widespread use may lead to capacitive reactive reverse transmission during low load periods, and even increased terminal voltage, which is not conducive to the safe and stable operation of the power grid. Especially during holidays and low load periods, the impact of cable charging power on system voltage is more obvious. Under the current operating mode, the increase in cable lines has caused reactive reverse transmission or increased voltage at the end of the line, which has a great impact on the substation voltage.

[0004] The purpose of optimizing reactive power compensation configuration in distribution networks is to determine the optimal capacity of reactive power compensation devices under various operating modes and constraints. At present, reactive power compensation in distribution networks focuses more on capacitive reactive power compensation and does not consider inductive reactive power demand. It is difficult to effectively control voltage fluctuations in power grids with a large number of cables connected. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a method and system for configuring a differentiated reactive power compensation device with a large number of cable accesses, which effectively improves the automation level and investment benefits of the distribution network and meets the new requirements for distribution network planning and design.

[0006] The present invention adopts the following technical solution.

[0007] The first aspect of the present invention provides a method for configuring a differentiated reactive power compensation device for accessing a large number of cables, comprising: Obtain basic substation information, incoming and outgoing cable parameters, and set the power factor requirement value during substation peak load and power factor requirement at off-peak load ; Calculate the power factor of the substation at peak load based on the basic information and the parameters of the incoming and outgoing cables and power factor at low load , and according to and as well as The lower limit of The upper limit value of determines the type of reactive power compensation device to be configured; according to and and , Calculate the capacitive reactive power compensation required for the substation , Inductive reactive power compensation value , and use this to calculate the compensated power factor at peak load and valley load , , using the preset iterative calculation accuracy to update , , recalculate , ,Record , The corresponding , ,use , The corresponding , Perform interpolation calculation to obtain the reactive configuration capacity of the reactive compensation device required.

[0008] Preferably, the basic information also includes transformer capacity and transformer impedance voltage percentage; The inlet and outlet cable parameters include the inlet and outlet cable model and cable length.

[0009] Preferably, the calculation model of the power factor of the substation at peak load is: (1) In the formula, It is the active load value on the low voltage side during the peak load of the substation; It is the reactive load value on the low voltage side during the peak load of the substation; Charging power for incoming and outgoing cables; is the transformer impedance voltage percentage; is the transformer capacity; is the no-load current percentage.

[0010] Preferably, the calculation model of the power factor during the valley load is: (2) In the formula, It is the active load value on the low voltage side during the valley load of the substation; It is the reactive load value on the low voltage side during the valley load of the substation; Charging power for incoming and outgoing cables; is the transformer impedance voltage percentage; is the transformer capacity.

[0011] Preferably, the charging power of the incoming and outgoing cables The calculation model is: (3) (4) In the formula, is the charging power of cable i; is the system frequency; is the capacitance value; is the cable operating voltage; is the cable length and n is the total number of cables.

[0012] Preferably, the and as well as The lower limit of The upper limit value of determines the type of reactive power compensation device to be configured, as follows: like Lower than If the lower limit is reached, the substation needs to be equipped with a capacitive reactive power compensation device; like Higher than If the upper limit value is reached, the substation needs to be equipped with an inductive reactive power compensation device.

[0013] Preferably, the capacitive reactive power compensation value The calculation formula is as follows: (5) The inductive reactive power compensation value The calculation formula is as follows: (6) in It is the active load value on the low voltage side during the peak load of the substation; It is the active load value on the low voltage side during valley load of the substation.

[0014] Preferably, the calculation formula of the compensated power factor at the peak load is: (7) The calculation formula of the power factor after compensation during the valley load is: (8) In the formula, It is the active load value on the low voltage side during the peak load of the substation; It is the reactive load value on the low voltage side during the peak load of the substation; Charging power for incoming and outgoing cables; is the transformer impedance voltage percentage; is the transformer capacity; It is the active load value on the low voltage side during the valley load of the substation; It is the reactive load value on the low voltage side during valley load of the substation.

[0015] Preferably, the method for determining whether the power factor after compensation meets the standard is: If the power factor after compensation during peak load Less than The lower limit of Meet the standard, otherwise Not up to standard; Power factor after compensation at low load Greater than The upper limit value of Meet the standard, otherwise Not up to standard.

[0016] Preferably, the preset iterative calculation accuracy is updated , , as follows: , ,in, Iteration calculation accuracy.

[0017] A second aspect of the present invention provides a system for configuring a differentiated reactive power compensation device for accessing a large number of cables, comprising: Data acquisition module, used to obtain basic substation information, incoming and outgoing cable parameters and set the power factor requirement value during substation peak load and power factor requirement at off-peak load ; Reactive power compensation device analysis module, used to calculate the power factor of the substation at peak load based on the basic information and the parameters of the incoming and outgoing cables and power factor at low load , and according to and as well as The lower limit of The upper limit value of determines the type of reactive power compensation device to be configured; Reactive power configuration capacity calculation module is used to calculate the and and , Calculate the capacitive reactive power compensation required for the substation , Inductive reactive power compensation value , and use this to calculate the compensated power factor at peak load and valley load , , using the preset iterative calculation accuracy to update , , recalculate , ,Record , The corresponding , ,use , The corresponding , Perform interpolation calculation to obtain the reactive configuration capacity of the reactive compensation device required.

[0018] A third aspect of the present invention provides a terminal, comprising a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the method.

[0019] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the method when executed by a processor.

[0020] Compared with the prior art, the beneficial effects of the present invention include at least: The present invention configures reactive power compensation devices that take into account inductive reactive power requirements in a power grid with a large number of cables connected, thereby ensuring the stability and efficiency of the power grid. The present invention comprehensively considers the influence of parameters such as load and cable length of different substations on power factor, and provides the appropriate capacity configuration required by the reactive power compensation device at peak and valley loads. This differentiated configuration method can reasonably allocate reactive power compensation resources according to the actual operation status of the power grid, thereby effectively controlling voltage fluctuations, avoiding reactive power reverse transmission problems, reducing active power loss of the power grid, and improving energy transmission efficiency. In addition, this method helps to reduce unnecessary investment and reduce the construction and operation costs of the power grid.

[0021] The calculation model of the power factor at peak and valley loads proposed by the present invention can quickly calculate the power factor of the substation, which is convenient for the subsequent simple calculation of reactive power compensation capacity.

[0022] The present invention can take into account the impact of a large number of cable accesses on the reactive power of the distribution network under the new power system, thereby more reasonably configuring the capacity of the reactive power compensation device and supporting the stable and economical operation of the new urban power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of reactive power configuration of the present invention; Figure 2This is a flowchart of reactive power configuration capacity iteration of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0025] Embodiment 1 of the present invention provides a method for configuring a differentiated reactive power compensation device for accessing a large number of cables, including: S1: Obtain basic substation information, incoming and outgoing cable parameters, and set the power factor requirement value during substation peak load and power factor requirement at off-peak load ; Further optimization is to clarify the load situation of the substation, determine the reactive charging situation of the connected cables, the power factor of the substation and other information, with the focus on determining the basic information of the substation and the parameters of the incoming and outgoing cables.

[0026] The basic information mainly includes transformer capacity , Transformer impedance voltage percentage , load capacity, etc.; The inlet and outlet cable parameters include but are not limited to the inlet and outlet cable model, cable length ; Said The lower limit of is 0.97. The upper limit value of is 0.95; It also determines the capacity of a single group of reactive equipment, iterative calculation accuracy, etc.

[0027] S2: Calculate the power factor of the substation at peak load based on the basic information and the parameters of the incoming and outgoing cables and power factor at low load , and according to and as well as The lower limit of The upper limit value of determines the type of reactive power compensation device to be configured; Further preferably, a power factor model of the substation peak and valley loads is established with transformer parameters, cable information and load values ​​(active load values ​​P1, P2; reactive load values ​​Q1, Q2) as input quantities, and the reactive equipment to be configured is analyzed based on the output results of the existing data; (1) The calculation model of the power factor of the substation at peak load is: (1) In the formula, is the power factor during the substation peak load period; It is the active load value on the low voltage side during the peak load of the substation; It is the reactive load value on the low voltage side during the peak load of the substation; is the charging power of the incoming and outgoing lines (if any, 0 if not); is the transformer impedance voltage percentage; is the transformer capacity; is the no-load current percentage.

[0028] (2) The calculation model of the power factor of the substation at low load is: (2) In the formula, is the power factor of the substation during valley load period; It is the active load value on the low voltage side during the valley load of the substation; It is the reactive load value on the low voltage side during valley load of the substation.

[0029] Inlet and outlet cable charging power The calculation model is: (3) (4) In the formula, is the charging power of cable i; is the system frequency; is the capacitance value; is the cable operating voltage; is the cable length and n is the total number of cables.

[0030] (4) After establishing the power factor model of the substation at peak load and valley load respectively with transformer parameters, cable information and load value as input, the power factor under different load conditions is analyzed as follows: If the power factor is lower than If the lower limit value is lower than 0.97, the substation needs to be equipped with a capacitive reactive power compensation device; If the power factor is higher than If the upper limit value is higher than 0.95, the substation needs to be equipped with an inductive reactive power compensation device.

[0031] S3: Based on the power factor at peak load and power factor at low load and , Calculate the capacitive reactive power compensation required for the substation , Inductive reactive power compensation value , and use this to calculate the compensated power factor at peak load and valley load , Regardless of whether the power factor after compensation meets the standard or not, the preset iterative calculation accuracy is used to update , , recalculate , ,Record , The corresponding , ,use , The corresponding , Perform interpolation calculation to obtain the reactive configuration capacity of the reactive compensation device required.

[0032] Further preferably, the minimum reactive power required to meet the power factor standard is established as a principle, and the calculation is based on the load level data. , , respectively check the power factor after compensation at peak load and valley load; Based on the compensated power factor, and on the premise of ensuring the normal operation of the system, with the minimum reactive power compensation capacity as the principle, after iteration and sampling processing, a suitable reactive power configuration scheme is given to ensure stable and economical operation of the system.

[0033] Depend on Figure 2 It can be seen that the reactive power factor model is established to test the power factor after compensation at peak load and valley load respectively. Whether the test is qualified (up to standard) or not, it needs to be updated. , Restart the cycle calculation, the updated , For the original , ± iterative calculation accuracy, until the power factor changes from unqualified to qualified or qualified to unqualified, stop the calculation, and obtain the reactive power compensation value at the time of power factor qualified-unqualified switching and the latest reactive power compensation value at the time of power factor unqualified-qualified switching. Interpolate these two values ​​to obtain the reactive power configuration capacity value.

[0034] Through iterative cycle calculation, the reactive power compensation calculation values ​​are made close to the required values. Finally, through interpolation calculation, the reactive power equipment capacity with high accuracy is obtained, so as to maximize the economic benefits of reactive power equipment and reduce the investment cost of reactive power equipment.

[0035] The power factor test model after reactive power compensation at peak load and valley load is combined with the calculation results of the reactive power equipment capacity value required by the substation to calculate the power factor after reactive power compensation at peak load, which serves as the basis for power factor judgment during iterative calculation.

[0036] The configuration amount of reactive power compensation device is restricted by the power factor at peak and valley times. The configuration amount constraint function of reactive power compensation device is: , (1) Capacitive reactive power compensation value The calculation formula is as follows: (5) Inductive reactive power compensation value The calculation formula is as follows: (6) (2) Establish a reactive power factor model after compensation at peak load and check the power factor after compensation. The calculation formula for the power factor after compensation at peak load is: (7) In the formula It is the power factor after reactive power compensation at peak load; is the capacitive reactive power compensation value required for the substation (Mvar).

[0037] A reactive power factor model after compensation during valley load is established to test the power factor after compensation. The calculation formula for the power factor after compensation during valley load is: (8) In the formula It is the power factor after reactive power compensation at peak load; is the inductive reactive power compensation value required by the substation (Mvar).

[0038] (3) The method for judging whether the power factor after compensation meets the standard or not is: If the power factor after compensation during peak load Less than The lower limit of Meet the standard, otherwise Not up to standard; Power factor after compensation at low load Greater than The upper limit value of Meet the standard, otherwise Not up to standard.

[0039] (4) Using iterative calculation accuracy update , The way is as follows: , ,in, Iteration calculation accuracy.

[0040] The specific embodiments are as follows: Taking a certain area as an experimental object, a method for configuring a differentiated reactive power compensation device with a large number of cable accesses of the present invention comprises: S1: Determine the basic information of the substation and the parameters of the incoming and outgoing cables; Transformer impedance voltage percentage of a 110kV substation: U d %=14; Transformer capacity :50MVA; Load capacity: 80MVA for 10kV load at peak load and 20MVA for 10kV load at valley load; The lower limit of the power factor requirement at peak load is 0.97, which is used for calculation : ; , where 80 corresponds to the peak load of 10kV at 80MVA; The upper limit of the power factor requirement at off-peak load is 0.95, which is used for calculation : ; , where 20 corresponds to the 10kV load of 20MVA during the valley load mentioned above; Incoming and outgoing line information: 110kV incoming cable cross section is 1000mm 2 , length is 7km, 10kV outgoing cable section is 240mm 2 , with a length of 72km.

[0041] Substation power factor requirement during peak load: In this embodiment Specifically, take 0.97; Required power factor of substation during off-peak load: In this embodiment Specifically, take 0.95.

[0042] It is also determined that: Capacity of single reactive power compensation equipment: 4Mvar; Iteration calculation accuracy : 0.4; S2: Analyze the reactive power compensation device required for configuration; (1) According to the length of the incoming and outgoing cables, the cable charging power can be obtained. The charging power of 10kV and 110kV lines is as follows: , , , The sum of ; (2) Power factor at peak load: , Power factor at low load: , The above power factor results show that: At peak load, the power factor when the capacitive reactive power equipment is compensated is 0.944, which is lower than the lower limit of 0.97 required by the substation, indicating that the substation needs to be equipped with a capacitive reactive power compensation device; During valley load, the power factor without inductive reactive power compensation equipment is 0.997, which is higher than the upper limit of 0.95 required by the substation, indicating that the substation needs to be equipped with an inductive reactive power compensation device.

[0043] S3: Calculate the reactive configuration capacity of the reactive compensation device required: (1) Capacitive reactive power compensation The substation needs a power factor of , so the capacitive reactive power compensation value is calculated as follows: , In the above formula Specifically, take 0.97; The power factor after reactive power compensation at peak load is: , The power factor after compensation is still less than 0.97, so it is iterated again.

[0044] When the capacitive reactive power compensation value When the power factor is 6.52Mvar, the power factor after compensation is is 0.968; Update the capacitive reactive power compensation value with 6.52Mvar + iterative calculation accuracy 0.4 = 6.92Mvar , recalculate the compensated power factor It is 0.969, still less than 0.97; Update the capacitive reactive power compensation value with 6.92Mvar + iterative calculation accuracy 0.4 = 7.32Mvar , recalculate the compensated power factor The power factor is 0.971, which is considered to be acceptable.

[0045] When the power factor is qualified, the capacitive reactive power compensation value is 7.32Mvar, and the power factor after compensation is 0.971; when the power factor is unqualified, the capacitive reactive power compensation value The power factor after compensation is 0.969. It is necessary to interpolate these two capacitive reactive power compensation values ​​and find that when the power factor after compensation is 0.97, the reactive configuration capacity (capacitive reactive power compensation value) is 7.1Mvar.

[0046] (2) Inductive reactive power compensation The substation needs a power factor of , so the inductive reactive power compensation value is calculated as follows: ,

[0047] In the above formula Specifically take 0.95; The power factor after reactive power compensation when using valley load is: ,

[0048] Power factor after compensation It is still greater than 0.95, so iterate again.

[0049] The update calculation based on the iterative calculation accuracy of 0.4 is as follows: When the inductive reactive power compensation value When the power factor is 5.67Mvar, the power factor after compensation is is 0.964; When the inductive reactive power compensation value When the power factor is 6.07Mvar, the power factor after compensation is is 0.958; When the inductive reactive power compensation value When the power factor is 6.47Mvar, the power factor after compensation is is 0.952; When the inductive reactive power compensation value When it is 6.87Mvar, the power factor after compensation is The power factor is 0.946, which is considered to be acceptable.

[0050] According to the above calculation value, when the power factor is qualified, the inductive reactive power compensation value is The power factor after compensation is 0.946. When the power factor after compensation is unqualified, the inductive reactive power compensation value is The power factor after compensation is 0.952. By interpolation calculation, it is found that when the compensated power factor is 0.95, the reactive configuration capacity (inductive reactive compensation value) is 6.61Mvar.

[0051] In summary, the calculated capacity of capacitive reactive equipment is 7.1Mvar, and the inductive reactive capacity is 6.61Mvar. Since the capacity of a single reactive compensation device is 4Mvar, two sets of inductive and capacitive reactive configurations are required.

[0052] Embodiment 2 of the present invention provides a system for configuring a differentiated reactive power compensation device for accessing a large number of cables, including: Data acquisition module, used to obtain basic substation information, incoming and outgoing cable parameters and set the power factor requirement value during substation peak load and power factor requirement at off-peak load ; Reactive power compensation device analysis module, used to calculate the power factor of the substation at peak load based on the basic information and the parameters of the incoming and outgoing cables and power factor at low load , and according to and as well as The lower limit of The upper limit value of determines the type of reactive power compensation device to be configured; Reactive power configuration capacity calculation module is used to calculate the and and , Calculate the capacitive reactive power compensation required for the substation , Inductive reactive power compensation value , and use this to calculate the compensated power factor at peak load and valley load , , using the preset iterative calculation accuracy to update , , recalculate , ,Record , The corresponding , ,use , The corresponding , Perform interpolation calculation to obtain the reactive configuration capacity of the reactive compensation device required.

[0053] Embodiment 3 of the present invention provides a terminal, including a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the method.

[0054] Embodiment 4 of the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the method when executed by a processor.

[0055] Compared with the prior art, the beneficial effects of the present invention include at least: The present invention configures reactive power compensation devices that take into account inductive reactive power requirements in a power grid with a large number of cables connected, thereby ensuring the stability and efficiency of the power grid. The present invention comprehensively considers the influence of parameters such as load and cable length of different substations on power factor, and provides the appropriate capacity configuration required by the reactive power compensation device at peak and valley loads. This differentiated configuration method can reasonably allocate reactive power compensation resources according to the actual operation status of the power grid, thereby effectively controlling voltage fluctuations, avoiding reactive power reverse transmission problems, reducing active power loss of the power grid, and improving energy transmission efficiency. In addition, this method helps to reduce unnecessary investment and reduce the construction and operation costs of the power grid.

[0056] The calculation model of the power factor at peak and valley loads proposed by the present invention can quickly calculate the power factor of the substation, which is convenient for the subsequent simple calculation of reactive power compensation capacity.

[0057] The present invention can take into account the impact of a large number of cable accesses on the reactive power of the distribution network under the new power system, thereby more reasonably configuring the capacity of the reactive power compensation device and supporting the stable and economical operation of the new urban power system.

[0058] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0059] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the above. More specific examples (a non-exhaustive list) of computer-readable storage media include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the above. The computer-readable storage medium used herein is not to be interpreted as a transient signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0060] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0061] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer, partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect through the Internet). In some embodiments, by using the state information of the computer-readable program instructions to personalize an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit may execute the computer-readable program instructions, thereby implementing various aspects of the present disclosure.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for configuring a differentiated reactive power compensation device for a large number of cable accesses, characterized in that: include: Obtain basic substation information, incoming and outgoing cable parameters, and set the power factor requirement value during substation peak load and power factor requirement at off-peak load ; Calculate the power factor of the substation at peak load based on the basic information and the parameters of the incoming and outgoing cables and power factor at low load , and according to and as well as The lower limit of The upper limit value of determines the type of reactive power compensation device to be configured; according to and and , Calculate the capacitive reactive power compensation required for the substation , Inductive reactive power compensation value , and use this to calculate the compensated power factor at peak load and valley load , , using the preset iterative calculation accuracy to update , , recalculate , ,Record , The corresponding , ,use , The corresponding , Perform interpolation calculation to obtain the reactive configuration capacity of the reactive compensation device required.

2. According to claim 1, a method for configuring a differentiated reactive power compensation device for a large number of cable accesses, characterized in that: The basic information includes transformer capacity and transformer impedance voltage percentage; The inlet and outlet cable parameters include the inlet and outlet cable model and cable length.

3. According to claim 1, a method for configuring a differentiated reactive power compensation device for a large number of cable accesses, characterized in that: The calculation model of the power factor of the substation at peak load is: （1） In the formula, It is the active load value on the low voltage side during the peak load of the substation; It is the reactive load value on the low voltage side during the peak load of the substation; Charging power for incoming and outgoing cables; is the transformer impedance voltage percentage; is the transformer capacity; is the no-load current percentage.

4. The method for configuring a differentiated reactive power compensation device for a large number of cable accesses according to claim 1, characterized in that: The calculation model of the power factor during the valley load is: （2） In the formula, It is the active load value on the low voltage side during the valley load of the substation; It is the reactive load value on the low voltage side during the valley load of the substation; Charging power for incoming and outgoing cables; is the transformer impedance voltage percentage; is the transformer capacity.

5. The method for configuring a differentiated reactive power compensation device for a large number of cable accesses according to claim 1, characterized in that: Inlet and outlet cable charging power The calculation model is: （3） （4） In the formula, is the charging power of cable i; is the system frequency; is the capacitance value; is the cable operating voltage; is the cable length and n is the total number of cables.

6. The method for configuring a differentiated reactive power compensation device for a large number of cable accesses according to claim 1, characterized in that: The basis and as well as The lower limit of The upper limit value of determines the type of reactive power compensation device to be configured, as follows: like Lower than If the lower limit is reached, the substation needs to be equipped with a capacitive reactive power compensation device; like Higher than If the upper limit value is reached, the substation needs to be equipped with an inductive reactive power compensation device.

7. The method for configuring a differentiated reactive power compensation device for a large number of cable accesses according to claim 1, characterized in that: The capacitive reactive power compensation value The calculation formula is as follows: （5） The inductive reactive power compensation value The calculation formula is as follows: （6） in It is the active load value on the low voltage side during the peak load of the substation; It is the active load value on the low voltage side during valley load of the substation.

8. The method for configuring a differentiated reactive power compensation device for a large number of cable accesses according to claim 1, characterized in that: The calculation formula of the compensated power factor at the peak load is: （7） The calculation formula of the power factor after compensation during the valley load is: （8） In the formula, It is the active load value on the low voltage side during the peak load of the substation; It is the reactive load value on the low voltage side during the peak load of the substation; Charging power for incoming and outgoing cables; is the transformer impedance voltage percentage; is the transformer capacity; It is the active load value on the low voltage side during the valley load of the substation; It is the reactive load value on the low voltage side during valley load of the substation.

9. The method for configuring a differentiated reactive power compensation device for a large number of cable accesses according to claim 1, characterized in that: The method for judging whether the power factor after compensation meets the standard is: If the power factor after compensation during peak load Less than The lower limit of Meet the standard, otherwise Not up to standard; Power factor after compensation at low load Greater than The upper limit value of Meet the standard, otherwise Not up to standard.

10. The method for configuring a differentiated reactive power compensation device for a large number of cable accesses according to claim 1, characterized in that: The preset iterative calculation accuracy is updated , , as follows: , ,in, Iteration calculation accuracy.

11. A system for configuring a differentiated reactive power compensation device for accessing a large number of cables, using the method according to any one of claims 1 to 10, characterized in that: The system comprises: Data acquisition module, used to obtain basic substation information, incoming and outgoing cable parameters and set the power factor requirement value during substation peak load and power factor requirement at off-peak load ; Reactive power compensation device analysis module, used to calculate the power factor of the substation at peak load based on the basic information and the parameters of the incoming and outgoing cables and power factor at low load , and according to and as well as The lower limit of The upper limit value of determines the type of reactive power compensation device to be configured; Reactive power configuration capacity calculation module is used to calculate the and and , Calculate the capacitive reactive power compensation required for the substation , Inductive reactive power compensation value , and use this to calculate the compensated power factor at peak load and valley load , , using the preset iterative calculation accuracy to update , , recalculate , ,Record , The corresponding , ,use , The corresponding , Perform interpolation calculation to obtain the reactive configuration capacity of the reactive compensation device required.

12. A terminal comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1-10.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 10 are implemented.

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