Controllable voltage source arc extinguishing method, control device and computer storage medium

Abstract

The present invention relates to a controllable voltage source arc extinguishing method, a control device and a computer storage medium, and the method comprises: S1, when a ground fault occurs in a distribution network, obtaining three-phase voltage change data outputted after the distribution network fails; S2, generating three phase voltage increment matrices corresponding to three phase lines one by one according to the three-phase voltage change data; S3, sorting and transforming each phase voltage increment matrix to obtain three multidimensional data matrices corresponding to the three phase voltage increment matrices one by one; S4, performing similarity analysis according to the three multidimensional data matrices to obtain a first similarity coefficient capable of representing the similarity between phase A and phase B, a second similarity coefficient capable of representing the similarity between phase B and phase C, and a third similarity coefficient capable of representing the similarity between phase A and phase C; S5, determining the fault phase according to the first to third similarity coefficients. The present invention can simplify the fault phase determination method and improve the fault phase determination efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of controllable voltage source arc extinguishing devices, and in particular to a controllable voltage source arc extinguishing method, a control device and a computer storage medium. Background Art

[0002] The controllable voltage source arc extinguishing device can output the corresponding current to compensate for the ground fault current according to the difference between the zero-sequence admittance matrix of the distribution network during normal operation and after the fault occurs. It combines the advantages of power electronics technology and traditional arc extinguishing coils, makes up for the shortcomings of traditional passive arc extinguishing coils that cannot compensate for active components and harmonic components of current, and realizes full compensation of ground fault current, so it is widely favored. However, to determine the fault phase, the controllable voltage source arc extinguishing device generally requires the amplitude and phase angle of the three-phase voltage to judge the fault phase, or to open the point fault phase by tracking the zero-sequence voltage trajectory. The execution calculation method is relatively complex and inefficient, which affects the arc extinguishing performance of the controllable voltage source arc extinguishing device. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a controllable voltage source arc extinguishing method, a control device and a computer storage medium.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a controllable voltage source arc extinguishing method for a controllable voltage source arc extinguishing device, the controllable voltage source arc extinguishing method comprising:

[0005] S1. When a ground fault occurs in the distribution network connected to the controllable voltage source arc extinguishing device, obtain the three-phase voltage change data outputted after the fault occurs in the distribution network;

[0006] S2. Generate three phase voltage increment matrices corresponding to the three phase lines one by one according to the three-phase voltage change data;

[0007] S3, sorting and transforming each of the phase voltage increment matrices to obtain three multidimensional data matrices corresponding to the three phase voltage increment matrices;

[0008] S4, performing similarity analysis based on the three multidimensional data matrices to obtain a first similarity coefficient capable of representing the similarity between phase A and phase B, a second similarity coefficient capable of representing the similarity between phase B and phase C, and a third similarity coefficient capable of representing the similarity between phase A and phase C;

[0009] S5. Determine the fault phase according to the first to third similarity coefficients.

[0010] Preferably, the three-phase voltage change data includes voltage change data of phase A, voltage change data of phase B and voltage change data of phase C; wherein the voltage change data of each phase line includes a plurality of voltage signals arranged in increasing order based on sampling time;

[0011] In S2, generating three phase voltage increment matrices corresponding to three phase lines one by one according to the three-phase voltage change data includes:

[0012] The voltage change data of the A-phase line, the voltage change data of the B-phase line, and the voltage change data of the C-phase line are respectively: determining m voltage increments corresponding to each of the voltage signals in the voltage change data of the X-phase line according to the first calculation formula, and forming a phase voltage increment matrix corresponding to the X-phase line according to the multiple voltage increments;

[0013] Wherein, the first calculation formula is expressed as: , represents the i-th voltage increment of the phase voltage increment matrix of the X phase line, X is A, B or C, i=1, 2, ..., m-1, The (i+1)th voltage signal representing the voltage variation data of the X-phase line.

[0014] Preferably, in S3, the ordering and conversion of each phase voltage increment matrix comprises:

[0015] For each of the phase voltage increment matrices, the following is performed:

[0016] S31, determining the phase voltage increment matrix as the first multidimensional vector and the vector to be converted, and setting Y to 1;

[0017] S32, Y increases by one;

[0018] S33, determine whether Y is less than P, if so, execute S34, otherwise execute S36;

[0019] S34, shifting the first q voltage increments of the vector to be converted as a whole to the tail end of the vector to be converted to obtain the Yth multidimensional vector; wherein q is a positive integer;

[0020] S35, updating the Y-th multidimensional vector to the vector to be converted, and returning to S32;

[0021] S36. Establish a multidimensional data matrix corresponding to the phase voltage increment matrix according to the 1st to P-1th multidimensional vectors.

[0022] Preferably, in S4, performing similarity analysis based on the three multidimensional data matrices includes:

[0023] The extended Gaussian image is used to perform similarity analysis on each of the three multidimensional data matrices to obtain the first similarity coefficient, the second similarity coefficient and the third similarity coefficient.

[0024] Preferably, in S5, determining the fault phase according to the first to third similarity coefficients includes:

[0025] Determine the similarity coefficient corresponding to the middle value of the first to third similarity coefficients as the target coefficient;

[0026] When the target coefficient is the first similarity coefficient, phase C is determined as the fault phase;

[0027] When the target coefficient is the second similarity coefficient, phase A is determined as the fault phase;

[0028] When the target coefficient is the third similarity coefficient, phase B is determined as the faulty phase.

[0029] Preferably, the controllable voltage source arc extinguishing method further comprises:

[0030] S6. Determine the voltage reduction value when the controllable voltage source arc extinguishing device extinguishes the fault phase according to the first to third similarity coefficients.

[0031] Preferably, in S6, determining the voltage reduction value when the controllable voltage source arc extinguishing device extinguishes the fault phase according to the first to third similarity coefficients includes:

[0032] When phase A is determined to be the fault phase, the voltage drop value is calculated according to the second calculation formula, which is expressed as: ,in, Indicates the voltage drop value corresponding to when phase A is determined to be the fault phase, represents the second similarity coefficient, represents the third similarity coefficient, represents the first similarity coefficient;

[0033] When phase B is determined to be the fault phase, the voltage drop value is calculated according to the third calculation formula, which is expressed as: , Indicates the voltage drop value corresponding to when phase B is determined to be the fault phase;

[0034] When phase C is determined to be the fault phase, the voltage drop value is calculated according to the fourth calculation formula, which is expressed as: , It indicates the voltage drop value corresponding to when phase C is determined to be the fault phase.

[0035] Preferably, before S1, the method further includes:

[0036] S01. Acquire output parameters of the distribution network in real time, and determine whether a ground fault occurs in the distribution network according to the output parameters.

[0037] The present invention also constructs a control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned controllable voltage source arc extinguishing method when executing the computer program.

[0038] The present invention also constructs a computer storage medium storing a computer program, and the computer program implements the steps of the above-mentioned controllable voltage source arc extinguishing method when it is run.

[0039] The implementation of the present invention has the following beneficial effects: the present invention first obtains the three-phase voltage change data output after the distribution network fails; then generates three phase voltage increment matrices according to the three-phase voltage change data, and then sorts and transforms the phase voltage increment matrices to obtain three multidimensional data matrices; then performs similarity analysis according to the three multidimensional data matrices to obtain the first similarity coefficient, the second similarity coefficient and the third similarity coefficient; finally, determines the fault phase according to the first to third similarity coefficients. It can be understood that the present invention realizes the determination of the fault phase by analyzing the similarity of the first to third similarity coefficients without detecting the phase angle and the zero-sequence voltage, simplifies the method for determining the fault phase and improves the efficiency of determining the fault phase, and plays a positive role in improving the arc extinguishing performance of the controllable voltage source arc extinguishing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0041] Figure 1 is a flowchart of a controllable voltage source arc extinguishing method in some embodiments of the present invention;

[0042] Figure 2 is a flowchart of a program for sorting and converting the voltage increment matrix of each phase in some embodiments of the present invention;

[0043] Figure 3 is a circuit structure block diagram of a control device in some embodiments of the present invention. DETAILED DESCRIPTION

[0044] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0045] It should be noted that the flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0046] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0047] Figure 1 The following is a flow chart of a controllable voltage source arc extinguishing method in some embodiments of the present invention. The method is used to control the controllable voltage source arc extinguishing device to perform arc extinguishing work, so that the controllable voltage source arc extinguishing device can reduce the voltage at a suitable voltage reduction value, thereby improving the performance of the controllable voltage source arc extinguishing device. Figure 1 As shown, the controllable voltage source arc extinguishing method may include step S1, step S2, step S3, step S4, step S5 and step S6.

[0048] Step S1 includes: when a ground fault occurs in the distribution network connected to the controllable voltage source arc extinguishing device, the three-phase voltage change data output after the fault occurs in the distribution network is obtained. Specifically, when a ground fault occurs in the distribution network, the three-phase voltage signal output by the distribution network within a set time or m cycles after the fault moment can be obtained to form the three-phase voltage change data. The set time and m (a positive integer) can be adaptively set according to the actual situation. Generally, the set time is not less than 1 second and m is not less than 20. In order to simplify the algorithm of the subsequent steps, this step preferably obtains the three-phase voltage change data in the form of the number of cycles. It should be noted that the three-phase voltage change data includes the voltage change data of the A phase line, the voltage change data of the B phase line and the voltage change data of the C phase line, and the voltage change data of each phase line includes a plurality of voltage signals arranged in ascending order from small to large (or from early to late) based on the sampling time (that is, the earlier the sampling time, the smaller the sequence number corresponding to the voltage signal).

[0049] In some embodiments, Figure 1As shown, step S01 may be included before step S1. Step S01 includes: acquiring the output parameters of the distribution network in real time, and determining whether a ground fault occurs in the distribution network according to the output parameters. In this embodiment, whether a ground fault occurs in the distribution network can be determined by the output parameters and the existing ground fault detection method (such as a three-phase voltage unbalance detection method, a zero-sequence voltage detection method, a three-phase current vector sum detection method, etc.). It can be understood that the output parameter can be the three-phase voltage or three-phase current output by the distribution network. For example, when the output parameter is a three-phase voltage, the three-phase voltage unbalance detection method can be used to determine whether a ground fault occurs in the distribution network.

[0050] Step S2 includes: generating three phase voltage increment matrices corresponding to the three phase lines one by one according to the three-phase voltage change data.

[0051] In some embodiments, generating three phase voltage increment matrices corresponding to the three phase lines according to the three-phase voltage change data in step S2 may include: performing the following operations on the voltage change data of the A phase line, the voltage change data of the B phase line, and the voltage change data of the C phase line: determining m voltage increments corresponding to each voltage signal in the voltage change data of the X phase line according to a first calculation formula, and forming a phase voltage increment matrix corresponding to the X phase line according to the multiple voltage increments; wherein the first calculation formula is expressed as: , represents the i-th voltage increment of the phase voltage increment matrix of the X phase line, X is A, B or C, i=1, 2, ..., m-1, The i+1th voltage signal representing the voltage change data of the X phase line, The i-th voltage signal representing the voltage variation data of the X-phase line.

[0052] It is understandable that when a ground fault occurs in a phase line of the distribution network, the faulty phase will be obviously distorted. However, due to the imbalance of the three-phase voltage, the voltage waveform of the remaining two normal phase lines (i.e., the fault-free phase lines) will be distorted. Compared with the voltage magnitude, the voltage increment can better characterize the magnitude of the change in phase voltage in each cycle, and can very conveniently and clearly characterize the degree of voltage distortion, which helps to identify the faulty phase and voltage drop value in subsequent steps.

[0053] Step S3 includes: sorting and transforming each phase voltage increment matrix to obtain three multi-dimensional data matrices corresponding to the three phase voltage increment matrices.

[0054] In some embodiments, the sorting conversion of each phase voltage increment matrix in step S3 may include: sorting each phase voltage increment matrix as follows: Figure 2 Steps S31 to S36 are shown.

[0055] Step S31 includes: determining the phase voltage increment matrix as the first multidimensional vector and the vector to be converted, and setting Y to 1. Specifically, It corresponds to the first multidimensional vector of the phase voltage increment matrix of the X phase line. In addition, Y is a natural number.

[0056] Step S32 includes: Y is increased by 1. The function of this step is to make Y self-increment, and step S33 is executed after each self-increment.

[0057] Step S33 includes: determining whether Y is less than P, if yes, executing step S34, otherwise executing step S36. P is a natural number, and its setting range can be 5 to 8.

[0058] Step S34 includes: shifting the first q voltage increments of the vector to be converted to the tail end of the vector to be converted as a whole to obtain the Y-th multidimensional vector; wherein q is a positive integer. In the step, the phase voltage increment matrix of the X phase line (corresponding to the first multidimensional vector of the X phase line, which is also the vector to be converted), the first multidimensional vector is expressed as: , assuming q is equal to 2, then the first two voltage increments correspond to and ,Will and Shift to the end of the vector to be converted to obtain the second multidimensional vector, expressed as: Then after executing step S34 again, the third multidimensional vector is obtained, which is expressed as: After each shift is completed, step S35 is executed.

[0059] In some embodiments, the setting range of q can be 10 to 15. It should be noted that q must be smaller than m, and q determines the stride of each shift, while P determines the number of cyclic shifts. q and P are determined by the total number of samples (i.e., the size of m). Generally, q and P are positively correlated with m.

[0060] Step S35 includes: updating the Yth multidimensional vector as the vector to be converted, and returning to step S32. It can be understood that this step will set the latest obtained Yth multidimensional vector as the latest vector to be converted, and return to step S32.

[0061] Step S36 includes: establishing a multidimensional data matrix corresponding to the phase voltage increment matrix according to the 1st to P-1th multidimensional vectors. The multidimensional data matrix is ​​expressed as: , where X is A, B or C, that is, the A-phase multidimensional data matrix corresponding to the A-phase voltage increment matrix is ​​expressed as: ,The B-phase multidimensional data matrix corresponding to the B-phase voltage increment matrix is ​​expressed as: , the C-phase multidimensional data matrix corresponding to the C-phase voltage increment matrix is ​​expressed as: .

[0062] Step S4 includes: performing similarity analysis based on the three multidimensional data matrices to obtain a first similarity coefficient that can represent the similarity between phase A and phase B, a second similarity coefficient that can represent the similarity between phase B and phase C, and a third similarity coefficient that can represent the similarity between phase A and phase C.

[0063] In some embodiments, performing similarity analysis based on three multidimensional data matrices in step S4 may include: using extended Gaussian images to perform similarity analysis on each of the three multidimensional data matrices to obtain a first similarity coefficient, a second similarity coefficient, and a third similarity coefficient. Specifically, first convert the A-phase multidimensional data matrix, the B-phase multidimensional data matrix, and the C-phase multidimensional data matrix into two-dimensional matrices of the same size, and then calculate the first similarity coefficient, the second similarity coefficient, and the third similarity coefficient using a similarity calculation formula. The similarity calculation formula is expressed as: ,in, represents the first similarity coefficient, represents the second similarity coefficient, represents the third similarity coefficient.

[0064] Step S5 includes: determining the fault phase according to the first similarity coefficient, the second similarity coefficient and the third similarity coefficient.

[0065] In some embodiments, determining the fault phase according to the first to third similarity coefficients in step S5 may include: determining the similarity coefficient corresponding to the middle value of the first to third similarity coefficients as the target coefficient; when the target coefficient is the first similarity coefficient, determining phase C as the fault phase; when the target coefficient is the second similarity coefficient, determining phase A as the fault phase (i.e., the phase line where the ground fault occurs); when the target coefficient is the third similarity coefficient, determining phase B as the fault phase. It can be understood that the principle of this step is: affected by the fault phase, the two phase lines without fault will produce different degrees of distortion due to the imbalance of the three-phase voltage, but due to the different phases of the three phase lines, the influence of the distortion will also have different influences due to the different phases, resulting in the fault phase and any normal phase line being either relatively similar or having obvious differences, that is, the similarity between the fault phase and one of the normal phase lines is obviously greater than the similarity between the two normal phase lines, and the similarity between the fault phase and the other normal phase line is obviously smaller than the similarity between the two normal phase lines, so the fault phase can be determined by taking the middle value of the three first to third similarity coefficients as the target coefficient and determining the fault phase according to the target coefficient.

[0066] Step S6 includes: determining a voltage reduction value when the controllable voltage source arc extinguishing device extinguishes the fault phase according to the first similarity coefficient, the second similarity coefficient and the third similarity coefficient.

[0067] In some embodiments, determining the voltage reduction value when the controllable voltage source arc extinguishing device extinguishes the fault phase according to the first similarity coefficient, the second similarity coefficient and the third similarity coefficient in step S6 may include:

[0068] When phase A is determined to be the fault phase, the voltage drop value is calculated according to the second calculation formula, which is expressed as: ,in, Indicates the voltage drop value corresponding to when phase A is determined to be the fault phase;

[0069] When phase B is determined to be the fault phase, the voltage drop value is calculated according to the third calculation formula, which is expressed as: , Indicates the voltage drop value corresponding to when phase B is determined as the fault phase;

[0070] When phase C is determined to be the fault phase, the voltage drop value is calculated according to the fourth calculation formula, which is expressed as: , Indicates the voltage drop value corresponding to when phase C is determined to be the fault phase.

[0071] In this embodiment, since the voltage level of the distribution network in which the controllable voltage source arc extinguishing device is actually applied is relatively large, taking a 6.3 kV distribution network as an example, , and The unit can be kilovolts.

[0072] Further, after determining the voltage reduction value, the controllable voltage source arc extinguishing method may further include: controlling the controllable voltage source arc extinguishing device to perform arc extinguishing work according to the voltage reduction value. It can be understood that this embodiment can accurately control the working state of the controllable voltage source arc extinguishing device and improve the arc extinguishing effect of the controllable voltage source arc extinguishing device.

[0073] The technical solution of the present invention is implemented by first acquiring the three-phase voltage change data output after the fault occurs in the distribution network; then generating three phase voltage increment matrices according to the three-phase voltage change data, and then sorting and transforming the voltage increment matrices of each phase to obtain three multidimensional data matrices; then performing similarity analysis according to the three multidimensional data matrices to obtain the first similarity coefficient, the second similarity coefficient and the third similarity coefficient; finally determining the fault phase according to the first to third similarity coefficients. It can be understood that the present invention realizes the determination of the fault phase by analyzing the similarity of the first to third similarity coefficients without detecting the phase angle and the zero-sequence voltage, simplifies the method for determining the fault phase and improves the efficiency of determining the fault phase, and plays a positive role in improving the arc extinguishing performance of the controllable voltage source arc extinguishing device.

[0074] like Figure 3As shown, the present invention also provides a control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the controllable voltage source arc extinguishing method provided in an embodiment of the present invention are implemented.

[0075] The present invention also provides a computer storage medium storing a computer program, which implements the steps of the controllable voltage source arc extinguishing method provided in an embodiment of the present invention when the computer program is running.

[0076] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0077] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0078] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0079] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A controllable voltage source arc extinguishing method, used in a controllable voltage source arc extinguishing device, characterized in that: The controllable voltage source arc extinguishing method comprises: S1. When a ground fault occurs in the distribution network connected to the controllable voltage source arc extinguishing device, obtain the three-phase voltage change data output after the fault occurs in the distribution network; the three-phase voltage change data includes the voltage change data of the A phase line, the voltage change data of the B phase line and the voltage change data of the C phase line; wherein the voltage change data of each phase line includes a plurality of voltage signals arranged in ascending order based on the sampling time; S2. Generate three phase voltage increment matrices corresponding to the three phase lines one by one according to the three-phase voltage change data; S3, sorting and transforming each of the phase voltage increment matrices to obtain three multidimensional data matrices corresponding to the three phase voltage increment matrices; S4, performing similarity analysis based on the three multidimensional data matrices to obtain a first similarity coefficient capable of representing the similarity between phase A and phase B, a second similarity coefficient capable of representing the similarity between phase B and phase C, and a third similarity coefficient capable of representing the similarity between phase A and phase C; S5, determining the fault phase according to the first to third similarity coefficients; In S2, generating three phase voltage increment matrices corresponding to three phase lines one by one according to the three-phase voltage change data includes: The voltage change data of the A-phase line, the voltage change data of the B-phase line, and the voltage change data of the C-phase line are respectively: determining m voltage increments corresponding to each of the voltage signals in the voltage change data of the X-phase line according to the first calculation formula, and forming a phase voltage increment matrix corresponding to the X-phase line according to the multiple voltage increments; Wherein, the first calculation formula is expressed as: , represents the i-th voltage increment of the phase voltage increment matrix of the X phase line, X is A, B or C, i=1, 2, ..., m-1, The i+1th voltage signal representing the voltage change data of the X-phase line; In S3, the ordering and conversion of each phase voltage increment matrix includes: For each of the phase voltage increment matrices, the following is performed: S31, determining the phase voltage increment matrix as the first multidimensional vector and the vector to be converted, and setting Y to 1; S32, Y increases by one; S33, determine whether Y is less than P, if so, execute S34, otherwise execute S36; S34, shifting the first q voltage increments of the vector to be converted as a whole to the tail end of the vector to be converted to obtain the Yth multidimensional vector; wherein q is a positive integer; S35, updating the Y-th multidimensional vector to the vector to be converted, and returning to S32; S36. Establish a multidimensional data matrix corresponding to the phase voltage increment matrix according to the 1st to P-1th multidimensional vectors.

2. The controllable voltage source arc extinguishing method according to claim 1, characterized in that: In S4, performing similarity analysis based on the three multidimensional data matrices includes: The extended Gaussian image is used to perform similarity analysis on each of the three multidimensional data matrices to obtain the first similarity coefficient, the second similarity coefficient and the third similarity coefficient.

3. The controllable voltage source arc extinguishing method according to claim 1, characterized in that: In S5, determining the fault phase according to the first to third similarity coefficients includes: Determine the similarity coefficient corresponding to the middle value of the first to third similarity coefficients as the target coefficient; When the target coefficient is the first similarity coefficient, phase C is determined as the fault phase; When the target coefficient is the second similarity coefficient, phase A is determined as the fault phase; When the target coefficient is the third similarity coefficient, phase B is determined as the faulty phase.

4. The controllable voltage source arc extinguishing method according to claim 3, characterized in that: Also includes: S6. Determine the voltage reduction value when the controllable voltage source arc extinguishing device extinguishes the fault phase according to the first to third similarity coefficients.

5. The controllable voltage source arc extinguishing method according to claim 4, characterized in that: In S6, determining the voltage reduction value when the controllable voltage source arc extinguishing device extinguishes the fault phase according to the first to third similarity coefficients includes: When phase A is determined to be the fault phase, the voltage drop value is calculated according to the second calculation formula, which is expressed as: ,in, Indicates the voltage drop value corresponding to when phase A is determined to be the fault phase, represents the second similarity coefficient, represents the third similarity coefficient, represents the first similarity coefficient; When phase B is determined to be the fault phase, the voltage drop value is calculated according to the third calculation formula, which is expressed as: , Indicates the voltage drop value corresponding to when phase B is determined to be the fault phase; When phase C is determined to be the fault phase, the voltage drop value is calculated according to the fourth calculation formula, which is expressed as: , It indicates the voltage drop value corresponding to when phase C is determined to be the fault phase.

6. The controllable voltage source arc extinguishing method according to any one of claims 1 to 5, characterized in that: Before S1, the method further includes: S01. Acquire output parameters of the distribution network in real time, and determine whether a ground fault occurs in the distribution network according to the output parameters.

7. A control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the controllable voltage source arc extinguishing method according to any one of claims 1 to 6 are implemented.

8. A computer storage medium, characterized in that A computer program is stored, and when the computer program is run, the steps of the controllable voltage source arc extinguishing method described in any one of claims 1 to 6 are implemented.

Images