Static synchronous phase modifier configuration method and system for suppressing active drop in low-voltage ride-through period

Abstract

The invention belongs to the technical field of synchronous phase modifier configuration, and provides a static synchronous phase modifier configuration method and system for inhibiting active drop in a low-pass period. The method comprises the following steps: determining an active drop key fault point according to the topological structure change condition of a high-proportion new energy system and the active drop strength of the system when each node has a fault; determining a configuration area of the static synchronous phase modifier according to a known relationship among the active drop key fault point, the static synchronous phase modifier configuration node and the voltage drop size of the key fault point; iterative search is carried out in the determined configuration area of the static synchronous phase modifier, and the node with the maximum active drop improvement amount is obtained and is the optimal configuration node of the static synchronous phase modifier. The method can effectively inhibit the active power drop during the low-voltage ride-through period of the high-proportion new energy system, and guarantees the safe and stable operation of the high-proportion new energy power system.

Description

Technical Field

[0001] The present invention belongs to the technical field of synchronous condenser configuration, and in particular relates to a static synchronous condenser configuration method and system for suppressing active power drop during a low-breakthrough period. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] As new energy sources gradually replace traditional synchronous units, the power system is accelerating towards power electronics, resulting in a significant decrease in the anti-interference and support capabilities of the power system. In particular, when AC and DC faults occur, the impact range of voltage disturbances expands rapidly. The tolerance of new energy units under low voltage conditions is relatively weak. Therefore, in order to ensure that new energy units can continue to operate stably when the system fails, low voltage ride through (LVRT) technology is generally used. However, during the low ride through process, the active power of new energy units is often greatly reduced, which in turn causes active power drop (Active Power Droop, APD) to the power grid, seriously affecting the safety and stability of high-proportion new energy power systems.

[0004] In order to effectively deal with the active power drop of new energy units during low voltage ride-through, static synchronous condenser (SSC) as a new type of power electronic device has been widely used in power systems. Static synchronous condenser uses power electronic technology and short-term energy storage devices to provide synchronous voltage support for the power grid. As an independent synchronous voltage source, it can instantly provide fast reactive power support when a system failure occurs. By introducing static synchronous condenser into the power grid, the voltage drop at the grid connection point can be significantly alleviated, and the large-scale active power drop of new energy units during low voltage ride-through can be suppressed.

[0005] In order to further improve the effect of static synchronous condenser on the active power drop during the low-power penetration period of new energy units, it is very important to reasonably determine the optimal configuration position of static synchronous condenser. At present, the existing configuration method of static synchronous condenser mainly focuses on transient overvoltage suppression and commutation failure suppression, and less consideration is given to the suppression of active power drop during the low-power penetration period. In the high-proportion new energy system, the existing static synchronous condenser configuration method is no longer applicable. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a static synchronous phase-converter configuration method and system for suppressing active power drop during low voltage ride-through, which can effectively suppress the active power drop during low voltage ride-through of a high-proportion new energy system and ensure the safe and stable operation of a high-proportion new energy power system.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A first aspect of the present invention provides a static synchronous condenser configuration method for suppressing active power drop during a low-breakthrough period.

[0009] In one or more embodiments, a method for configuring a static synchronous condenser for suppressing active power drop during a low-break period is provided, comprising:

[0010] According to the topological structure changes of the high-proportion new energy system and the active power drop intensity of the system when each node fails, the key fault points of active power drop are determined;

[0011] According to the known relationship among the key fault point of active power drop, the configuration node of the static synchronous condenser and the voltage drop size of the key fault point, the configuration area of ​​the static synchronous condenser is determined;

[0012] An iterative search is performed in the determined configuration area of ​​the static synchronous condenser to obtain the node with the maximum improvement in active power drop, which is the optimal configuration node of the static synchronous condenser.

[0013] As an implementation method, the node with the largest active power drop intensity in the system is the key active power drop fault point.

[0014] As an implementation method, when a node i fails, the system active power drop intensity APD i It is expressed as:

[0015]

[0016] Where: k = 1...m, represents the grid connection node of the new energy unit; ΔU i Indicates the voltage drop of fault node i; Z ik , Z ii are the elements in the node impedance matrix.

[0017] As an implementation method, the known relationship between the key fault point of active power drop, the static synchronous condenser configuration node and the voltage drop size of the key fault point is:

[0018]

[0019] Where: t represents the key fault node of active power drop, c represents the static synchronous condenser configuration node, ΔU t Indicates the voltage drop at the critical fault point; Z tc represents the mutual impedance between the fault node and the phase regulator node; Z tt represents the fault node self-impedance.

[0020] As an implementation method, the configuration area D of the static synchronous condenser is expressed as:

[0021]

[0022] As an implementation method, the voltage drop at the key fault point of active power drop is set to 1pu, and the static synchronous phase condenser is configured at node c. The improvement amount of active power drop in the system is It is expressed as:

[0023]

[0024] Where: k = 1...m, represents the grid connection node of the new energy unit; Z SSC Represents the subtransient reactance of the static synchronous condenser; Z ct represents the mutual impedance between the fault node and the phase regulator node; Z ck represents the mutual impedance between the phase regulator node and the new energy node; Z tk represents the mutual impedance between the fault node and the new energy node; Z cc Z represents the phase shifter node self-impedance; tt represents the fault node self-impedance.

[0025] As an implementation method, during the iterative search within a determined configuration area of ​​the static synchronous condenser, the position constraints of the static synchronous condenser configuration node c and the new energy unit node k are expressed as: c, k∈D; wherein D is the configuration area of ​​the static synchronous condenser.

[0026] A second aspect of the present invention provides a static synchronous condenser configuration system for suppressing active power drop during a low-breakthrough period.

[0027] In one or more embodiments, a static synchronous condenser configuration system for suppressing active power drop during low-breakthrough period includes:

[0028] Active power drop key fault point determination module, which is used to determine the active power drop key fault point according to the topological structure change of the high-proportion new energy system and the active power drop intensity of the system when each node fails;

[0029] The static synchronous condenser configuration area module is used to determine the configuration area of ​​the static synchronous condenser according to the known relationship between the key fault point of active power drop, the static synchronous condenser configuration node and the voltage drop size of the key fault point;

[0030] The optimal configuration module of the static synchronous condenser is used to iteratively search in the determined configuration area of ​​the static synchronous condenser to find the node with the maximum improvement in active power drop, which is the optimal configuration node of the static synchronous condenser.

[0031] A third aspect of the present invention provides a computer-readable storage medium.

[0032] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps in the static synchronous phase condenser configuration method for suppressing active power drop during low-breakthrough as described above.

[0033] A fourth aspect of the present invention provides an electronic device.

[0034] An electronic device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps in the static synchronous condenser configuration method for suppressing active power drop during low-breakthrough as described above are implemented.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention determines the key fault points of active power drop according to the changes in the topological structure of the high-proportion new energy system and the active power drop intensity of the system when each node fails; then delineates the configuration area of ​​the static synchronous phase condenser according to the key fault points, and finally iteratively searches within the determined configuration area of ​​the static synchronous phase condenser to obtain the node with the largest active power drop improvement to determine the configuration position of the static synchronous phase condenser. The method proposed in the present invention takes into account the inhibitory effect of the optimized configuration of the static synchronous phase condenser on the active power drop during the low-voltage ride-through of the new energy unit, effectively suppresses the active power drop during the low-voltage ride-through of the high-proportion new energy system, and ensures the safe and stable operation of the high-proportion new energy power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0038] Figure 1 It is a flow chart of a static synchronous condenser configuration method for suppressing active power drop during a low-breakthrough period according to an embodiment of the present invention;

[0039] Figure 2 Schematic diagram of the connection of a static synchronous condenser according to an embodiment of the present invention;

[0040] Figure 3 is a flow chart of configuration of a static synchronous condenser according to an embodiment of the present invention;

[0041] Figure 4 is a schematic diagram of an electronic device according to an embodiment of the present invention;

[0042] Figure 5It is a schematic diagram of the structure of a static synchronous phase condenser configuration system for suppressing active power drop during a low-breakthrough period according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0046] Figure 1 It is a flow chart of a static synchronous phase condenser configuration method for suppressing active power drop during a low-breakthrough period in an embodiment of the present invention.

[0047] Combination Figure 1 and Figure 3 The static synchronous phase condenser configuration method for suppressing active power drop during low-breakout period in this embodiment may include:

[0048] S101, according to the topological structure change of the high-proportion new energy system and the active power drop intensity of the system when each node fails, determine the key active power drop fault point.

[0049] Among them, the node with the largest active power drop intensity is the key fault point of active power drop.

[0050] Before dividing the configurable area of ​​the static synchronous condenser, it is necessary to find a critical fault point of active power drop in the system. When a voltage drop fault occurs at the critical fault point and its vicinity, the active power drop of the system is the largest.

[0051] The relationship between the voltage drop of the new energy unit and the voltage drop at the fault point can be expressed as:

[0052]

[0053] Where: ΔU k Indicates the voltage drop at the new energy grid-connected node k, ΔU i Indicates the voltage drop at fault node i, Z ik , Z ii are the elements in the node impedance matrix.

[0054] The active power drop during low voltage ride-through of new energy units APD can be expressed as:

[0055] APD=U0*I P0 -U t *I Pt (2)

[0056] In the formula: U0, I P0 Indicates the node voltage and active current during normal operation, U t ,I Pt Represents the node voltage and active current during low-level wear-through.

[0057] The active power drop of new energy units is positively correlated with the voltage drop, so the voltage drop at the grid connection point can be used to characterize the active power drop intensity of the system. When a fault occurs at node i, the active power drop intensity of the system APD i It is expressed as:

[0058]

[0059] Where: k = 1...m, represents the grid connection node of the new energy unit; ΔU i Indicates the voltage drop of fault node i; Z ik , Z ii are the elements in the node impedance matrix.

[0060] APD in the system i The largest point is the key fault point of active power drop. When this node fails, the voltage drop of the new energy units in the entire network is the most serious, resulting in the most serious active power drop.

[0061] Specifically, Figure 2 Taking the static synchronous condenser access schematic diagram shown in FIG. 1 as an example, step S101 includes the following steps:

[0062] Step S1011: Generate a node impedance matrix Z according to system parameters, taking into account the sub-transient reactance of synchronous units and new energy units, and the node number i=1;

[0063] Step S1012: Set the i node to have a three-phase short circuit fault, the voltage drop is 1, and calculate the active power drop evaluation function APD i , node number i+1;

[0064] Step S1013: determine whether the node number i is greater than the total number of system nodes n; if k ≥ n, go to step S1014; otherwise, go to step S1012;

[0065] Step S1014: APD i The largest node is the key fault point of active power drop.

[0066] S102, determining a configuration area of ​​the static synchronous condenser according to a known relationship among a key fault point of active power drop, a configuration node of the static synchronous condenser, and a voltage drop magnitude at the key fault point.

[0067] According to the obtained key fault point of active power drop in the system, the configuration area of ​​the static synchronous condenser is delineated. Because the improvement effect of the static synchronous condenser on the system voltage drop spreads from the configuration point of the condenser to the surrounding area, the configuration node of the static synchronous condenser should be located near the key fault point of active power drop.

[0068] Among them, according to the grid connection requirements of new energy units, when the grid connection point voltage is lower than 0.9pu, the new energy unit enters low-breakdown, that is, the voltage drop is greater than 0.1pu, so the configurable nodes of the static synchronous phase regulator should meet the following requirements:

[0069]

[0070] Where: t represents the key fault node of active power drop, c represents the static synchronous condenser configuration node, ΔU t Indicates the voltage drop at the critical fault point; Z tc represents the mutual impedance between the fault node and the phase regulator node; Z tt represents the fault node self-impedance.

[0071] That is, the known relationship among the key fault point of active power drop, the static synchronous condenser configuration node and the voltage drop size of the key fault point is determined.

[0072] The configuration area D of the static synchronous condenser is expressed as:

[0073]

[0074] Assuming that a three-phase short circuit occurs at the critical fault point and the voltage drop is 1 pu, the static synchronous condenser configuration area D is simplified to:

[0075]

[0076] S103, iteratively searching in the determined configuration area of ​​the static synchronous condenser to find the node with the maximum improvement in active power drop, which is the optimal configuration node of the static synchronous condenser.

[0077] According to the designated configuration area of ​​the static synchronous condenser, the objective function is defined to characterize the improvement effect of the condenser access on the active power drop. The optimal configuration node of the static synchronous condenser can be determined by iterative search in the configuration area.

[0078] After the static synchronous condenser is connected to the original power system, it can be considered that a new parallel branch to the ground is added to the system. After the static synchronous condenser is configured in the system, any element Z in the new node impedance matrix i ' j It can be expressed as:

[0079]

[0080] Where: c represents the access node of the static synchronous condenser, Z SSC Represents the subtransient reactance of the static synchronous condenser.

[0081] Assuming the voltage drop at the critical fault point of active power drop is 1pu, according to formula (7), node c is equipped with a static synchronous condenser, and the improvement of system active power drop is It is expressed as:

[0082]

[0083] Where: k = 1...m, represents the grid connection node of the new energy unit; Z SSC Represents the subtransient reactance of the static synchronous condenser; Z ct represents the mutual impedance between the fault node and the phase regulator node; Z ck represents the mutual impedance between the phase regulator node and the new energy node; Z tk represents the mutual impedance between the fault node and the new energy node; Z cc Z represents the phase shifter node self-impedance; tt represents the fault node self-impedance.

[0084] When a fault occurs at a critical fault point of active power drop, only the new energy units in the configuration area enter low voltage ride-through, resulting in active power drop. In the iterative search process within the determined configuration area of ​​the static synchronous condenser, the position constraints of the static synchronous condenser configuration node c and the new energy unit node k are expressed as follows:

[0085] c,k∈D(9);

[0086] Wherein, D is the configuration area of ​​the static synchronous condenser.

[0087] Specifically, step S103 includes the following steps:

[0088] Step S1031: Set the static synchronous condenser configuration node number i=1.

[0089] Step S1032: Determine whether the node number i is located in the static synchronous condenser configuration area. If so, go to step S1033; otherwise, go to step S1034.

[0090] Step S1033: Calculate the improvement of system active power drop after configuring the static synchronous condenser

[0091] Step S1034: Node number i+1, determine whether the node number i is greater than the total number of system nodes n, if i≥n, go to step S1035; otherwise, go to step S1032.

[0092] Step S1035: APD i The largest node is the static synchronous condenser configuration node.

[0093] Reference Figure 4 , a schematic diagram of an electronic device is given. It should be noted that, Figure 4 The electronic device 400 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0094] like Figure 4 As shown, electronic device 400 includes a central processing unit (CPU) 401, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 402 or a program loaded from a storage portion 408 into a random access memory (RAM) 403. In RAM 403, various programs and data required for system operation are also stored. Central processing unit 401, ROM 402 and RAM 403 are connected to each other via bus 404. Input / output (I / O) interface 405 is also connected to bus 404.

[0095] The following components are connected to the I / O interface 405: an input section 406 including a keyboard, a mouse, etc.; an output section 407 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 408 including a hard disk, etc.; and a communication section 409 including a network interface card such as a local area network (LAN) card, a modem, etc. The communication section 409 performs communication processing via a network such as the Internet. A drive 410 is also connected to the I / O interface 405 as needed. A removable medium 411, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 410 as needed so that a computer program read therefrom is installed into the storage section 408 as needed.

[0096] When the central processing unit 401 in the electronic device of this embodiment executes the program, the following is achieved: Figure 1 The steps in the method of configuring a static synchronous condenser for suppressing active power drop during low-breakthrough are shown.

[0097] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer readable medium, the computer program including a computer program for executing Figure 1 In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 409, and / or installed from the removable medium 411. When the computer program is executed by the central processing unit 401, various functions defined in the apparatus of the present application are executed.

[0098] in, Figure 1 The computer program instructions corresponding to the method shown may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0099] A person skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0100] Figure 5 Schematic diagram of the configuration system of a static synchronous condenser for suppressing active power drop during low penetration according to an embodiment of the present invention. Figure 1 The static synchronous condenser configuration method for suppressing active power drop during low penetration corresponds to the following: Figure 5 As shown, the static synchronous phase condenser configuration system for suppressing active power drop during low penetration in this embodiment may include:

[0101] Active power drop key fault point determination module 501, which is used to determine the active power drop key fault point according to the topological structure change of the high-proportion new energy system and the active power drop intensity of the system when each node fails;

[0102] The static synchronous condenser configuration area module 502 is used to determine the configuration area of ​​the static synchronous condenser according to the known relationship between the key fault point of active power drop, the static synchronous condenser configuration node and the voltage drop size of the key fault point;

[0103] The static synchronous condenser optimal configuration module 503 is used to iteratively search in the determined configuration area of ​​the static synchronous condenser to find the node with the maximum improvement in active power drop as the optimal configuration node of the static synchronous condenser.

[0104] Specifically, in the active power drop critical fault point determining module 501, the node with the largest active power drop intensity of the system is the active power drop critical fault point.

[0105] Before dividing the configurable area of ​​the static synchronous condenser, it is necessary to find a critical fault point of active power drop in the system. When a voltage drop fault occurs at the critical fault point and its vicinity, the active power drop of the system is the largest.

[0106] The relationship between the voltage drop of the new energy unit and the voltage drop at the fault point can be expressed as:

[0107]

[0108] Where: ΔU k Indicates the voltage drop at the new energy grid-connected node k, ΔU i Indicates the voltage drop at fault node i, Z ik , Z ii are the elements in the node impedance matrix.

[0109] The active power drop during low voltage ride-through of new energy units APD can be expressed as:

[0110] APD=U0*I P0 -U t *I Pt

[0111] In the formula: U0, I P0 Indicates the node voltage and active current during normal operation, U t ,I Pt Represents the node voltage and active current during low-level wear-through.

[0112] The active power drop of new energy units is positively correlated with the voltage drop, so the voltage drop at the grid connection point can be used to characterize the active power drop intensity of the system. When a fault occurs at node i, the active power drop intensity of the system APD i It is expressed as:

[0113]

[0114] Where: k = 1...m, represents the grid connection node of the new energy unit; ΔU i Indicates the voltage drop of fault node i; Z ik , Z ii are the elements in the node impedance matrix.

[0115] APD in the system i The largest point is the key fault point of active power drop. When this node fails, the voltage drop of the new energy units in the entire network is the most serious, resulting in the most serious active power drop.

[0116] In the static synchronous condenser configuration area module 502, the configuration area of ​​the static synchronous condenser is delineated according to the obtained key fault point of active power drop of the system. Because the improvement effect of the static synchronous condenser on the system voltage drop spreads from the configuration point of the condenser to the surrounding area, the configuration node of the static synchronous condenser should be located near the key fault point of active power drop.

[0117] Among them, according to the grid connection requirements of new energy units, when the grid connection point voltage is lower than 0.9pu, the new energy unit enters low-breakdown, that is, the voltage drop is greater than 0.1pu, so the configurable nodes of the static synchronous phase regulator should meet the following requirements:

[0118]

[0119] Where: t represents the key fault node of active power drop, c represents the static synchronous condenser configuration node, ΔU t Indicates the voltage drop at the critical fault point; Z tc represents the mutual impedance between the fault node and the phase regulator node; Z tt represents the fault node self-impedance.

[0120] That is, the known relationship among the key fault point of active power drop, the static synchronous condenser configuration node and the voltage drop size of the key fault point is determined.

[0121] The configuration area D of the static synchronous condenser is expressed as:

[0122]

[0123] Assuming that a three-phase short circuit occurs at the critical fault point and the voltage drop is 1 pu, the static synchronous condenser configuration area D is simplified to:

[0124]

[0125] In the static synchronous condenser optimal configuration module 503, according to the designated static synchronous condenser configuration area, an objective function is defined to characterize the improvement effect of condenser access on active power drop. By iteratively searching in the configuration area, the optimal configuration node of the static synchronous condenser can be determined.

[0126] After the static synchronous condenser is connected to the original power system, it can be considered that a new parallel branch to the ground is added to the system. After the static synchronous condenser is configured in the system, any element Z in the new node impedance matrix i ' j It can be expressed as:

[0127]

[0128] Where: c represents the access node of the static synchronous condenser, Z SSC It represents the sub-transient reactance of the static synchronous condenser. Assuming the voltage drop at the critical fault point of active power drop is 1pu, according to the above formula, node c is equipped with a static synchronous condenser, and the improvement amount of system active power drop is It is expressed as:

[0129]

[0130] Where: k = 1...m, represents the grid connection node of the new energy unit; Z SSC Represents the subtransient reactance of the static synchronous condenser; Z ct represents the mutual impedance between the fault node and the phase regulator node; Z ck represents the mutual impedance between the phase regulator node and the new energy node; Z tk represents the mutual impedance between the fault node and the new energy node; Z cc Z represents the phase shifter node self-impedance; tt represents the fault node self-impedance.

[0131] When a fault occurs at a critical fault point of active power drop, only the new energy units in the configuration area enter low voltage ride-through, resulting in active power drop. In the iterative search process within the determined configuration area of ​​the static synchronous condenser, the position constraints of the static synchronous condenser configuration node c and the new energy unit node k are expressed as follows:

[0132] c,k∈D;

[0133] Wherein, D is the configuration area of ​​the static synchronous condenser.

[0134] It should be noted here that Figure 5 The various modules in the static synchronous condenser configuration system for suppressing active power drop during low penetration are Figure 1 The various steps in the static synchronous phase condenser configuration method for suppressing active power drop during low-breakthrough correspond to each other one by one, and the specific implementation process is the same, which will not be repeated here.

[0135] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A static synchronous condenser configuration method for suppressing active power drop during low-breakthrough period, characterized in that: include: According to the topological structure changes of the high-proportion new energy system and the active power drop intensity of the system when each node fails, the key fault points of active power drop are determined; According to the known relationship among the key fault point of active power drop, the configuration node of the static synchronous condenser and the voltage drop size of the key fault point, the configuration area of ​​the static synchronous condenser is determined; An iterative search is performed in the determined configuration area of ​​the static synchronous condenser to obtain the node with the maximum improvement in active power drop, which is the optimal configuration node of the static synchronous condenser.

2. The static synchronous condenser configuration method for suppressing active power drop during low-breakout period according to claim 1, characterized in that: The node with the largest active power drop intensity in the system is the key active power drop fault point.

3. The static synchronous condenser configuration method for suppressing active power drop during low-breakout period according to claim 1, characterized in that: When node i fails, the system active power drop intensity APD i It is expressed as: Where: k = 1...m, represents the grid connection node of the new energy unit; ΔU i Indicates the voltage drop of fault node i; Z ik , Z ii are the elements in the node impedance matrix.

4. The static synchronous condenser configuration method for suppressing active power drop during low-breakthrough period according to claim 1, characterized in that: The known relationship between the key fault point of active power drop, the static synchronous condenser configuration node and the voltage drop size at the key fault point is: Where: t represents the key fault node of active power drop, c represents the static synchronous condenser configuration node, ΔU t Indicates the voltage drop at the critical fault point; Z tc represents the mutual impedance between the fault node and the phase regulator node; Z tt represents the fault node self-impedance.

5. The static synchronous condenser configuration method for suppressing active power drop during low-breakout period according to claim 4, characterized in that: The configuration area D of the static synchronous condenser is expressed as:

6. The static synchronous condenser configuration method for suppressing active power drop during low-breakout period according to claim 1, characterized in that: Assume that the voltage drop at the critical fault point of active power drop is 1pu, and node c is equipped with a static synchronous condenser. The improvement amount of active power drop in the system is It is expressed as: Where: k = 1...m, represents the grid connection node of the new energy unit; Z SSC Represents the subtransient reactance of the static synchronous condenser; Z ct represents the mutual impedance between the fault node and the phase regulator node; Z ck represents the mutual impedance between the phase regulator node and the new energy node; Z tk represents the mutual impedance between the fault node and the new energy node; Z cc Z represents the phase shifter node self-impedance; tt represents the fault node self-impedance.

7. The static synchronous condenser configuration method for suppressing active power drop during low-breakout period according to claim 1, characterized in that: In the process of iterative search within the determined configuration area of ​​the static synchronous condenser, the position constraints of the static synchronous condenser configuration node c and the new energy unit node k are expressed as: c, k∈D; where D is the configuration area of ​​the static synchronous condenser.

8. A static synchronous condenser configuration system for suppressing active power drop during low-breakthrough period, characterized in that: include: Active power drop key fault point determination module, which is used to determine the active power drop key fault point according to the topological structure change of the high-proportion new energy system and the active power drop intensity of the system when each node fails; The static synchronous condenser configuration area module is used to determine the configuration area of ​​the static synchronous condenser according to the known relationship between the key fault point of active power drop, the static synchronous condenser configuration node and the voltage drop size of the key fault point; The optimal configuration module of the static synchronous condenser is used to iteratively search in the determined configuration area of ​​the static synchronous condenser to find the node with the maximum improvement in active power drop, which is the optimal configuration node of the static synchronous condenser.

9. 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 static synchronous condenser configuration method for suppressing active power drop during a low-breakthrough period as described in any one of claims 1 to 7 are implemented.

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 program, the steps in the method for configuring a static synchronous condenser for suppressing active power drop during a low-breakthrough period as described in any one of claims 1 to 7 are implemented.

Images