Static and dynamic reactive power configuration method and device for multi-dc feed-in power grid

Abstract

The application provides a static and dynamic reactive power configuration method and device for a multi-direct-current feeding power grid, relates to the field of power systems, and obtains static reactive power compensation configuration of a power grid system; voltage reactive power disturbance checking is performed on each converter station to determine first target station configuration dynamic reactive power compensation devices; the multi-feeding short-circuit ratio of the direct-current converter station connected to the power grid system is obtained, the second target station is determined according to the multi-feeding short-circuit ratio to perform transient N-2 checking, and the configuration of the dynamic reactive power compensation device is adjusted; the direct current connected to the power grid system is subjected to blocking fault checking, and the configuration of the dynamic reactive power compensation device is adjusted; short-circuit current checking is performed on each converter station, and the configuration of the dynamic reactive power compensation device is adjusted until there is no converter station with over-standard short-circuit current, and the static and dynamic reactive power configuration scheme of the multi-direct-current feeding power grid is determined. The application can preliminarily judge the static and dynamic reactive power compensation configuration capacity and installation position of the multi-direct-current feeding power grid, and provide a reference judgment basis for reasonable planning.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power systems, in particular to a static and dynamic reactive power configuration method and device for a multi-direct current (DC) fed power grid. BACKGROUND

[0002] Dynamic reactive power compensation is mainly used to improve the dynamic reactive power support capability of the system. The dynamic reactive power compensation of the 220kV and above voltage level power grid is mainly used to provide dynamic reactive power support in the transient process of the system, reduce the risk of DC commutation failure and improve the voltage stability level of the power grid. Dynamic reactive power devices can quickly output reactive power under fault conditions to support the voltage of the system, which is conducive to the stability of the multi-DC fed system. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art.

[0004] To this end, one object of the present application is to provide a static and dynamic reactive power configuration method for a multi-DC fed power grid. The method includes obtaining static reactive power compensation configuration of a power grid system; performing voltage and reactive power disturbance checking on each converter station of the power grid system to check whether the reactive power voltage of the power grid meets the operation requirements. In response to the fact that the reactive power voltage of the power grid meets the operation requirements, a first target station is determined based on the response degree of each converter station to reactive power, and a dynamic reactive power compensation device is configured at the first target station. The multi-feeding short-circuit ratio of the DC converter station connected to the power grid system is obtained, and a second target station is determined according to the multi-feeding short-circuit ratio. Transient N-2 checking is performed at the second target station to determine whether there is a weak link of dynamic reactive power support in the power grid system. If there is, the configuration of the dynamic reactive power compensation device is adjusted until there is no weak link of dynamic reactive power support. Locking fault checking is performed on the DC connected to the power grid system to determine whether there is a weak link of dynamic reactive power support in the power grid system. If there is, the configuration of the dynamic reactive power compensation device is adjusted until there is no weak link of dynamic reactive power support. Short-circuit current checking is performed on each converter station of the power grid system to determine whether there is a converter station with excessive short-circuit current in the power grid system. If there is, the configuration of the dynamic reactive power compensation device is adjusted until there is no converter station with excessive short-circuit current. If there is not, a static and dynamic reactive power configuration scheme for the multi-DC fed power grid is determined.

[0005] The present application provides a static and dynamic reactive power configuration method suitable for a multi-DC fed power grid. Through this method, the static and dynamic reactive power compensation configuration capacity and installation position of the multi-DC fed power grid can be preliminarily judged, providing a reference for reasonably planning the static and dynamic reactive power configuration of the multi-DC fed power grid.

[0006] A second object of the present application is to provide a static and dynamic reactive power configuration device for a multi-direct-current feeding power grid, comprising: an acquisition module configured to acquire static reactive power compensation configuration of a power grid system; a reactive power disturbance checking module configured to perform voltage reactive power disturbance checking on each converter station of the power grid system to check whether the power grid reactive power voltage meets the operation requirements, and if the power grid reactive power voltage meets the operation requirements, determine a first target station based on the response degree of each converter station to reactive power, and configure a dynamic reactive power compensation device at the first target station; a transient checking module configured to acquire multi-feeding short-circuit ratios of direct-current converter stations connected to the power grid system, determine a second target station based on the multi-feeding short-circuit ratios, and perform transient N-2 checking at the second target station to determine whether there is a weak link of dynamic reactive power support in the power grid system, and if there is, adjust the configuration of the dynamic reactive power compensation device until there is no weak link of dynamic reactive power support; a blocking fault checking module configured to perform blocking fault checking on the direct current connected to the power grid system to determine whether there is a weak link of dynamic reactive power support in the power grid system, and if there is, adjust the configuration of the dynamic reactive power compensation device until there is no weak link of dynamic reactive power support; and a short-circuit current checking module configured to perform short-circuit current checking on each converter station of the power grid system to determine whether there is a converter station with excessive short-circuit current in the power grid system, and if there is, adjust the configuration of the dynamic reactive power compensation device until there is no converter station with excessive short-circuit current, and if there is not, determine a static and dynamic reactive power configuration scheme for the multi-direct-current feeding power grid.

[0007] A third object of the present application is to provide an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the static and dynamic reactive power configuration method for the multi-direct-current feeding power grid according to the first aspect of the present application.

[0008] A fourth object of the present application is to provide a non-transitory computer readable storage medium storing computer instructions, wherein the computer instructions are used to implement the static and dynamic reactive power configuration method for the multi-direct-current feeding power grid according to the first aspect of the present application.

[0009] A fifth object of the present application is to provide a computer program product comprising a computer program, wherein the computer program, when executed by a processor, implements the static and dynamic reactive power configuration method for the multi-direct-current feeding power grid according to the first aspect of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0010] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0011] Figure 1is a flow chart of a static and dynamic reactive power configuration method of a multi-direct current feeding power grid according to an embodiment of the present application.

[0012] Figure 2 is a schematic diagram of a static and dynamic reactive power configuration method of a multi-direct current feeding power grid according to an embodiment of the present application.

[0013] Figure 3 is a schematic diagram of a static and dynamic reactive power configuration device of a multi-direct current feeding power grid according to an embodiment of the present application.

[0014] Figure 4 is a schematic diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0015] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which examples of embodiments are shown, and the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0016] Figure 1 is an exemplary embodiment of a static and dynamic reactive power configuration method of a multi-direct current feeding power grid according to an embodiment of the present application, as shown in Figure 1 the static and dynamic reactive power configuration method of the multi-direct current feeding power grid comprises the following steps:

[0017] S101, obtaining static reactive power compensation configuration of a power grid system.

[0018] In order to reduce the transmission loss of reactive power and improve the efficiency of power transmission and distribution equipment, it is necessary to configure the reactive power compensation equipment of the power grid system. Before configuring the reactive power compensation equipment of the power grid system, the static reactive power compensation configuration of the power grid system needs to be obtained.

[0019] Exemplarily, when obtaining the static reactive power compensation configuration of the power grid system, research data of the power grid system can be built, and the power grid system is subjected to transient N-1 stability checking based on the research data. The results of the transient N-1 stability checking are obtained, and the research data are adjusted based on the checking results until the stability requirements of the power grid system are met. The demand of the power grid system for static reactive power compensation is determined through reactive power balance analysis, and the power grid system is configured for static reactive power compensation according to the principle of hierarchical and zonal balance.

[0020] In the present application, the total reactive power compensation capacity Q 补 of the power grid system is calculated by the following formula:

[0021] Q 补 = Q 静态 + Q 动态

[0022] Q 补 Q 静态 Q 动态 Q

[0023] S102, voltage and reactive power disturbance checking is performed on each converter station of the power grid system to check whether the power grid reactive power voltage meets the operation requirements, and if the power grid reactive power voltage meets the operation requirements, a first target station is determined based on the response degree of each converter station to the reactive power, and a dynamic reactive power compensation device is configured at the first target station.

[0024] After static reactive power compensation configuration is performed on the power grid system, voltage and reactive power disturbance checking is performed on each converter station of the power grid system to check whether the power grid reactive power voltage meets the operation requirements.

[0025] If the power grid reactive power voltage meets the operation requirements, a first target station is determined based on the response degree of each converter station to the reactive power, and configuration of dynamic reactive power compensation devices such as phase modulation machines, static var compensators (SVCs), static synchronous compensators (STATCOMs or SVGs) is performed at the first target station.

[0026] For example, when the first target station is determined based on the response degree of each converter station to the reactive power, a reactive power voltage action factor of each converter station can be obtained, the reactive power voltage action factors are sorted in descending order, and the first N converter stations are selected as the first target station. Alternatively, the value of N can be 5, that is, 5 converter stations are selected to be configured with dynamic reactive power compensation devices such as phase modulation machines, SVCs, STATCOMs (SVGs). The reactive power voltage action factor is used to reflect the response degree of the converter station to the reactive power.

[0027] When the response degree of each converter station to the reactive power is obtained, the reactive power compensation configuration of the converter station i is introduced to the reactive power voltage action factor I ji of the converter station j, and the calculation formula is as follows:

[0028]

[0029] I ji is the reactive power voltage action factor, i is the disturbance bus, j is the observation bus, ΔS i is the reactive power disturbance amount of the AC bus of the converter station i, which is about 1%, and ΔU j is the voltage change amount of the AC bus of the converter station j.

[0030] S103, obtain the multi-infeed short-circuit ratio of the DC converter station accessing the power grid system, determine the second target station according to the multi-infeed short-circuit ratio, and perform transient N-2 checking at the second target station to determine whether there is a weak link of dynamic reactive power support in the power grid system, and if there is, adjust the configuration of the dynamic reactive power compensation device until there is no weak link of dynamic reactive power support.

[0031] Obtain the multi-infeed short-circuit ratio of the DC converter station accessing the power grid system, and introduce the multi-infeed interaction factor I of the converter station i to the converter station j MIIFji , and the calculation formula is:

[0032]

[0033] In the formula, i is the self-disturbance bus, j is the observation bus, ΔU i is the voltage disturbance of the AC bus of the converter station i, about 1%, and ΔU j is the voltage change of the AC bus of the converter station j.

[0034] In the formula, I MIIFji describes the strength and weakness of the mutual coupling between the AC buses of the converter stations.

[0035] The multi-infeed short-circuit ratio I MIESCRi of the converter station i is calculated, and the calculation formula is:

[0036]

[0037] In the formula, S ci is the three-phase short-circuit capacity of the AC bus of the converter station i, Q cNi is the reactive power provided by the AC filter and shunt capacitor in the converter station when the voltage of the AC bus of the converter station is at the rated value, I MIIFji is the multi-infeed interaction factor of the converter station i to the converter station j, and P dcNi is the rated power of the i-th DC transmission line.

[0038] After determining the multi-infeed short-circuit ratio of the DC converter station accessing the power grid system, the multi-infeed short-circuit ratios are sorted in ascending order, and the M converter stations with the lowest multi-infeed short-circuit ratios are taken as the second target stations, where the value of M can be the same as or different from the value of N. If the value of M is the same as the value of N, that is, M is 5, the transient N-2 checking is performed on the selected five second target stations to determine whether there is a weak link of dynamic reactive power support in the power grid system. If there is a weak link of dynamic reactive power support, the configuration of the dynamic reactive power compensation device such as the phase modifier, SVC, STATCOM (SVG) is adjusted until there is no weak link of dynamic reactive power support.

[0039] S104, the DC connected to the power grid system is subjected to a blocking fault check to determine whether the power grid system has a weak link of dynamic reactive power support, and if so, the configuration of the dynamic reactive power compensation device is adjusted until there is no weak link of dynamic reactive power support.

[0040] The DC connected to the power grid system is subjected to a blocking fault check to determine whether the power grid system has a weak link of dynamic reactive power support, and if so, the configuration of the dynamic reactive power compensation device is adjusted until there is no weak link of dynamic reactive power support.

[0041] S105, the short-circuit current of each converter station of the power grid system is checked to determine whether there is a converter station with excessive short-circuit current in the power grid system, and if so, the configuration of the dynamic reactive power compensation device is adjusted until there is no converter station with excessive short-circuit current, and if not, the static and dynamic reactive power configuration scheme for the multi-DC feeding power grid is determined.

[0042] The short-circuit current of each converter station of the power grid system is checked to determine whether there is a converter station with excessive short-circuit current in the power grid system, and if so, the configuration of the dynamic reactive power compensation device is adjusted until there is no converter station with excessive short-circuit current, and if not, the static and dynamic reactive power configuration scheme for the multi-DC feeding power grid is determined.

[0043] The present application proposes a static and dynamic reactive power configuration method suitable for a multi-DC feeding power grid. Through this method, the static and dynamic reactive power compensation configuration capacity and installation position of the multi-DC feeding power grid can be preliminarily judged, providing a reference judgment basis for reasonably planning the static and dynamic reactive power configuration of the multi-DC feeding power grid.

[0044] Further, if in step S102, the voltage and reactive power disturbance of each converter station of the power grid system is checked to check whether the power grid reactive voltage meets the operation requirements, if the power grid reactive voltage does not meet the operation requirements, the configuration of the static reactive power compensation capacity is modified until the operation requirements are met, then the subsequent determination of the first target station based on the response degree of each converter station to reactive power is executed, and the dynamic reactive power compensation device is configured at the first target station.

[0045] Further, if in step S103, the transient N-2 check is performed at the second target station to determine whether the power grid system has a weak link of dynamic reactive power support, and if the power grid system does not have a weak link of dynamic reactive power support, then step S104 is directly executed.

[0046] Further, if the DC connected to the power grid system is subjected to the blocking fault check in step S104, and it is determined that there is no weak link of dynamic reactive power support in the power grid system, then step S105 is directly executed.

[0047] Figure 2 is an exemplary schematic diagram of a static and dynamic reactive power configuration method for a multi-DC feeding power grid, as shown in the embodiment of the present application. Figure 2 As shown in the embodiment of the present application, in the process of obtaining the static and dynamic reactive power configuration method for the multi-DC feeding power grid, the power grid research data needs to be built, and the transient N-1 stability check is performed based on the power grid research data, and it is determined whether the power grid system meets the stability requirement based on the check result. If the power grid system meets the stability requirement, the static reactive power compensation configuration is performed. If the power grid system does not meet the stability requirement, the power grid research data is modified until the power grid system meets the stability requirement, and the static reactive power compensation configuration is performed.

[0048] As shown in the embodiment of the present application, after the static reactive power compensation configuration is performed, it is determined whether the reactive voltage in the power grid system meets the operation requirement. If the reactive voltage meets the operation requirement, the voltage reactive disturbance check is performed on each site of the power grid, and the five sites with the largest response are sorted according to the response degree of each site to the reactive power, and the configuration of the dynamic reactive power compensation device such as phase modifier, SVC, STATCOM (SVG) is performed. If the reactive voltage does not meet the operation requirement, the static reactive power compensation configuration is modified until the reactive voltage meets the operation requirement. Figure 2 As shown in the embodiment of the present application, after the configuration of the dynamic reactive power compensation device such as phase modifier, SVC, STATCOM (SVG) is performed, the preliminary dynamic reactive power compensation device configuration is obtained, the multi-feeding short circuit ratio calculation is performed on the DC converter station connected to the power grid, the multi-feeding short circuit ratio value is obtained according to the calculation result, the five sites with the lowest ratio value are selected for the transient N-2 check, and it is determined whether there is a weak link of dynamic reactive power support in the power grid system. If there is a weak link of dynamic reactive power support in the power grid system, the configuration of the dynamic reactive power compensation device such as phase modifier, SVC, STATCOM (SVG) is adjusted until there is no weak link of dynamic reactive power support. If there is no weak link of dynamic reactive power support in the power grid system, the DC blocking fault check is directly performed.

[0049] Figure 2 As shown in the embodiment of the present application, after the configuration of the dynamic reactive power compensation device such as phase modifier, SVC, STATCOM (SVG) is performed, the preliminary dynamic reactive power compensation device configuration is obtained, the multi-feeding short circuit ratio calculation is performed on the DC converter station connected to the power grid, the multi-feeding short circuit ratio value is obtained according to the calculation result, the five sites with the lowest ratio value are selected for the transient N-2 check, and it is determined whether there is a weak link of dynamic reactive power support in the power grid system. If there is a weak link of dynamic reactive power support in the power grid system, the configuration of the dynamic reactive power compensation device such as phase modifier, SVC, STATCOM (SVG) is adjusted until there is no weak link of dynamic reactive power support. If there is no weak link of dynamic reactive power support in the power grid system, the DC blocking fault check is directly performed.

[0050] As shown in the embodiment of the present application, after the configuration of the dynamic reactive power compensation device such as phase modifier, SVC, STATCOM (SVG) is performed, the preliminary dynamic reactive power compensation device configuration is obtained, the multi-feeding short circuit ratio calculation is performed on the DC converter station connected to the power grid, the multi-feeding short circuit ratio value is obtained according to the calculation result, the five sites with the lowest ratio value are selected for the transient N-2 check, and it is determined whether there is a weak link of dynamic reactive power support in the power grid system. If there is a weak link of dynamic reactive power support in the power grid system, the configuration of the dynamic reactive power compensation device such as phase modifier, SVC, STATCOM (SVG) is adjusted until there is no weak link of dynamic reactive power support. If there is no weak link of dynamic reactive power support in the power grid system, the DC blocking fault check is directly performed. Figure 2 ​As shown, when checking the DC blocking fault of the power grid system, the system determines whether there are other weak links in the dynamic reactive power support based on the check results. If there are weak links in the dynamic reactive power support, the configuration of dynamic reactive power compensation devices such as synchronous condensers, SVC, and STATCOM (SVG) is adjusted until there are no weak links in the dynamic reactive power support. If there are no weak links in the dynamic reactive power support, the system directly proceeds to the short-circuit current check.

[0051] like Figure 2 As shown, when performing short-circuit current verification on the power grid system, the verification results are used to determine whether there are any sites in the power grid system with excessive short-circuit current. If there are sites with excessive short-circuit current, the configuration of dynamic reactive power compensation devices such as synchronous condensers, SVCs, and STATCOMs (SVGs) is adjusted until there are no sites with excessive short-circuit current. If there are no sites in the power grid system with excessive short-circuit current, a comprehensive configuration scheme for static and dynamic reactive power of multiple DC feeds into the power grid is obtained.

[0052] Figure 3 This application illustrates a schematic diagram of a static and dynamic reactive power configuration device for a multi-DC-feed power grid, as shown in the diagram. Figure 3 As shown, the static and dynamic reactive power configuration device 300 for the multi-DC-feed grid includes: an acquisition module 31, a reactive power disturbance verification module 32, a transient verification module 33, a blocking fault verification module 34, and a short-circuit current verification module 35, wherein:

[0053] The acquisition module 31 is used to acquire the static reactive power compensation configuration of the power grid system.

[0054] The reactive power disturbance verification module 32 is used to perform voltage reactive power disturbance verification on each converter station of the power grid system to verify whether the reactive power voltage of the power grid meets the operating requirements. If the reactive power voltage of the power grid meets the operating requirements, the first target station is determined based on the reactive power response of each converter station, and a dynamic reactive power compensation device is configured at the first target station.

[0055] The transient verification module 33 is used to obtain the multi-infeed short-circuit ratio of the DC converter station connected to the power grid system, determine the second target site based on the multi-infeed short-circuit ratio, and perform transient N-2 verification at the second target site to determine whether there is a weak link in the dynamic reactive power support of the power grid system. If there is, the configuration of the dynamic reactive power compensation device is adjusted until there is no weak link in the dynamic reactive power support.

[0056] The blocking fault verification module 34 is used to perform blocking fault verification on the DC connected to the power grid system to determine whether there is a weak link in the dynamic reactive power support of the power grid system. If there is, the configuration of the dynamic reactive power compensation device is adjusted until there is no weak link in the dynamic reactive power support.

[0057] The short-circuit current verification module 35 is used to verify the short-circuit current of each converter station in the power grid system to determine whether there are converter stations in the power grid system with excessive short-circuit current. If there are, the configuration of the dynamic reactive power compensation device is adjusted until there are no converter stations with excessive short-circuit current. If there are no, the static and dynamic reactive power configuration scheme of multiple DC feeds into the power grid is determined.

[0058] Furthermore, module 31 is also used for: building research data for the power grid system; performing transient N-1 stability verification on the power grid system, and adjusting the research data based on the verification results until the stability requirements of the power grid system are met; determining the power grid system's demand for static reactive power compensation through reactive power balance analysis, and configuring static reactive power compensation for the power grid system according to the principle of hierarchical and regional balance.

[0059] Furthermore, the reactive power disturbance verification module 32 is also used to: in response to the grid reactive power voltage not meeting the operating requirements, modify the configuration of the static reactive power compensation capacity until the operating requirements are met and execute subsequent steps.

[0060] Furthermore, the transient verification module 33 is also used to: in response to the absence of a weak link in the power grid system where there is no dynamic reactive power support, perform a blocking fault verification and subsequent steps for the DC connected to the power grid system.

[0061] Furthermore, the blocking fault verification module 34 is also used to: in response to the absence of a weak link in the power grid system with dynamic reactive power support, perform short-circuit current verification and subsequent steps for each converter station in the power grid system.

[0062] Furthermore, the reactive power disturbance verification module 32 is also used to: obtain the reactive power voltage action factor of each converter station, wherein the reactive power voltage action factor is used to reflect the degree of response of the converter station to reactive power; sort the reactive power voltage action factors in descending order, and select the first N converter stations as the first target station.

[0063] Furthermore, the transient verification module 33 is also used to: obtain the multi-infeed short-circuit ratio of each converter station; sort the multi-infeed short-circuit ratios in ascending order, and select the first M converter stations as the second target stations.

[0064] To achieve the above embodiments, this application also proposes an electronic device 400, such as... Figure 4 As shown, the electronic device 400 includes a processor 401 and a memory 402 communicatively connected to the processor. The memory 402 stores instructions that can be executed by at least one processor. The instructions are executed by at least one processor 401 to implement the static and dynamic reactive power configuration method for multiple DC-fed grids as shown in the above embodiment.

[0065] To achieve the above-mentioned embodiments, the embodiments of the present application further propose a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to make a computer implement the static and dynamic reactive configuration method of the multi-DC-infeed power grid as shown in the above-mentioned embodiments.

[0066] To achieve the above-mentioned embodiments, the embodiments of the present application further propose a computer program product comprising a computer program, the computer program, when executed by a processor, implements the static and dynamic reactive configuration method of the multi-DC-infeed power grid as shown in the above-mentioned embodiments.

[0067] In addition, the terms "first", "second", "third", etc. are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0068] In the description of the present application, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0069] Although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A method for static and dynamic reactive power configuration of a multi-DC feed-in grid, characterized in that, The method comprises the following steps: obtaining the static reactive power compensation configuration of the power grid system, including: building research data of the power grid system, performing transient N-1 stability checking on the power grid system, and adjusting the research data based on the checking result until the stability requirement of the power grid system is met, determining the demand of the power grid system for static reactive power compensation through reactive power balance analysis, and configuring static reactive power compensation for the power grid system according to the principle of hierarchical and zoned balance; performing voltage reactive disturbance checking on each converter station of the power grid system to check whether the power grid reactive voltage meets the operation requirement, and in response to the power grid reactive voltage meeting the operation requirement, determining a first target station based on the response degree of each converter station to reactive power, including: obtaining the reactive voltage action factor of each converter station, wherein the reactive voltage action factor is used to reflect the response degree of the converter station to reactive power, sorting the reactive voltage action factors in descending order, selecting the first N converter stations as the first target station, and configuring a dynamic reactive power compensation device at the first target station; obtaining the multi-infeed short-circuit ratio of the DC converter station connected to the power grid system, determining a second target station according to the multi-infeed short-circuit ratio, including: obtaining the multi-infeed short-circuit ratio of each converter station, sorting the multi-infeed short-circuit ratios in ascending order, selecting the first M converter stations as the second target station, and performing transient N-2 checking on the second target station to determine whether there is a weak link of dynamic reactive power support in the power grid system, and if there is, adjusting the configuration of the dynamic reactive power compensation device until there is no weak link of dynamic reactive power support; performing blocking fault checking on the DC connected to the power grid system to determine whether there is a weak link of dynamic reactive power support in the power grid system, and if there is, adjusting the configuration of the dynamic reactive power compensation device until there is no weak link of dynamic reactive power support; performing short-circuit current checking on each converter station of the power grid system to determine whether there is a converter station with excessive short-circuit current in the power grid system, and if there is, adjusting the configuration of the dynamic reactive power compensation device until there is no converter station with excessive short-circuit current, and if not, determining the static and dynamic reactive power configuration scheme of the multi-DC infeed power grid.

2. The method of claim 1, wherein, After the voltage reactive disturbance checking on each converter station of the power grid system to check whether the power grid reactive voltage meets the operation requirement, the method further comprises the following steps: in response to the power grid reactive voltage not meeting the operation requirement, modifying the configuration of the static reactive power compensation capacity until the operation requirement is met and performing the subsequent steps.

3. The method of claim 1, wherein, After the transient N-2 checking on the second target station to determine whether there is a weak link of dynamic reactive power support in the power grid system, the method further comprises the following steps: in response to the power grid system not having a weak link of dynamic reactive power support, performing blocking fault checking on the DC connected to the power grid system and the subsequent steps.

4. The method of claim 3, wherein, After the blocking fault checking on the DC connected to the power grid system to determine whether there is another weak link of dynamic reactive power support in the power grid system, the method further comprises the following steps: In response to the weak link of the power grid system without dynamic reactive power support, short-circuit current checking of each converter station of the power grid system and subsequent steps are performed.

5. A static and dynamic reactive configuration device for a multi-DC feed grid, characterized by, The method comprises the following steps: An acquisition module is configured to acquire static reactive power compensation configuration of the power grid system, including: building research data of the power grid system, performing transient N-1 stability checking on the power grid system, and adjusting the research data based on the checking result until the stability requirement of the power grid system is met, determining the demand of the power grid system for static reactive power compensation through reactive power balance analysis, and configuring static reactive power compensation of the power grid system according to the principle of hierarchical and zoned balance; A reactive disturbance checking module is configured to perform voltage reactive disturbance checking on each converter station of the power grid system to check whether the power grid reactive voltage meets the operation requirement, and if the power grid reactive voltage meets the operation requirement, to determine a first target station based on the response degree of each converter station to reactive power, including: acquiring a reactive voltage action factor of each converter station, wherein the reactive voltage action factor is used to reflect the response degree of the converter station to reactive power, sorting the reactive voltage action factors in descending order, selecting the first N converter stations as the first target station, and configuring a dynamic reactive compensation device at the first target station; A transient checking module is configured to acquire multi-infeed short-circuit ratios of DC converter stations connected to the power grid system, determine a second target station according to the multi-infeed short-circuit ratios, including: acquiring multi-infeed short-circuit ratios of each converter station, sorting the multi-infeed short-circuit ratios in ascending order, selecting the first M converter stations as the second target station, and performing transient N-2 checking on the second target station to determine whether the power grid system has a weak link of dynamic reactive power support, and if so, adjusting the configuration of the dynamic reactive compensation device until there is no weak link of dynamic reactive power support; A blocking fault checking module is configured to perform blocking fault checking on DC connected to the power grid system to determine whether the power grid system has a weak link of dynamic reactive power support, and if so, adjusting the configuration of the dynamic reactive compensation device until there is no weak link of dynamic reactive power support; A short-circuit current checking module is configured to perform short-circuit current checking on each converter station of the power grid system to determine whether the power grid system has a converter station with over-standard short-circuit current, and if so, adjusting the configuration of the dynamic reactive compensation device until there is no converter station with over-standard short-circuit current, and if not, determining a static and dynamic reactive power configuration scheme of the multi-DC infeed power grid.

6. An electronic device comprising: at least one processor; and a memory communicatively connected with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-4.

7. A non-transitory computer readable storage medium having stored thereon computer instructions, wherein, The computer instructions are used to enable the computer to perform the method of any one of claims 1-4.

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