A method, system, device and medium for locating power system disturbance sources

Abstract

The present invention relates to a method, system, device and medium for locating a power system disturbance source, including obtaining a power system topology diagram; obtaining the first position of each line relative to each PQM terminal; determining the first confidence vector of the line; if there is no unique maximum value in the first confidence vector, performing subsequent steps; respectively taking each first target PQM terminal as the current PQM terminal; determining the second position of each line relative to each first target PQM terminal (including the current PQM terminal); determining the second confidence vector of the line; if there is a unique maximum value in each second confidence vector, then judging the disturbance results of the second target PQM terminal and the third target PQM terminal to determine the disturbance source range. It solves the problems that the PQM terminal positioning result is incorrect, resulting in incorrect, ineffective and low-accuracy disturbance source positioning results of the NPQMS system.

Description

Background Art

[0002] In modern power systems, power quality monitoring devices and systems are receiving increasing attention. In addition to the conventional power quality general measurement function, advanced functions such as power quality intelligent diagnosis and positioning have also become important components of power quality devices and systems. Among them, the voltage disturbance source positioning function helps to improve the fault troubleshooting speed, maximize power supply reliability, reduce losses, and plays an important role in practical applications.

[0003] The development of the voltage disturbance source positioning function can be mainly divided into two periods. First, it is the determination of the disturbance source direction based on a single power quality monitoring point (PQM). In this scheme, only the relative position (upstream or downstream) between each PQM terminal and the voltage disturbance source can be roughly identified, and the accurate disturbance source position cannot be further determined from the system level. Until the later emergence of the networked power quality monitoring system (NPQMS), the information of PQM terminals widely distributed in the power system is collected, and the power quality disturbance source positioning of the power system is realized by using the characteristic matrix algorithm. The matrix algorithm generates a matrix based on the system topology diagram of the power system and the positioning information uploaded by the PQM terminals, and can determine the specific position of the disturbance source in the system. The logic is simple, no additional parameters need to be configured, and the positioning speed is fast, which is conducive to engineering implementation. However, this algorithm seriously depends on the absolute correctness of the disturbance source positioning direction at the PQM terminal. Even if there are only a small number (even one) of misjudgments at the PQM terminal, the final positioning result will be incorrect or invalid. Summary of the Invention

[0004] In order to overcome the problems that when the existing disturbance source is positioned, if there is an error in the PQM terminal, the disturbance source positioning result of the NPQMS system is incorrect, invalid, and has low accuracy, the present invention provides a power system disturbance source positioning method, system, device, and medium.

[0005] In a first aspect, to solve the above technical problems, the present invention provides a power system disturbance source positioning method, including the following steps:

[0006] S1, obtain a power system topology diagram, which is a circuit diagram with a hierarchical relationship. The power system topology diagram includes multiple PQM terminals and the lines between every two adjacent PQM terminals;

[0007] S2. Obtain the perturbation results of each PQM terminal. The perturbation result is the first result or the second result. For each PQM terminal, the first result represents that the PQM terminal detects a voltage perturbation and the position of the voltage perturbation source relative to the PQM terminal, and the second result represents that the PQM terminal does not detect a voltage perturbation. The voltage perturbation source includes the line at the upper level of the PQM terminal and / or the line at the lower level of the PQM terminal;

[0008] S3. Take the PQM terminals corresponding to the first results as the first target PQM terminals. For each first target PQM terminal, determine the first position of each line relative to the first target PQM terminal according to the first result corresponding to the first target PQM terminal. The first position is the first value or the second value. For a line, the first value represents that the line is within the system range included in the positioning result of the first target PQM terminal, and the second value represents that the line is outside the system range included in the positioning result of the first target PQM terminal;

[0009] S4. For each line, determine the first confidence vector of the line according to the first position of each line relative to each first target PQM terminal. The first confidence vector represents the credibility of each line being a faulty line;

[0010] S5. If there is no unique maximum value in the first confidence vector, execute S6;

[0011] S6. Take each PQM terminal in the first target PQM terminals as the current PQM terminal and execute S7 - S9;

[0012] S7. For each current PQM terminal, determine the second position of each line relative to each current PQM terminal according to the first position of each line relative to each current PQM terminal. If the first position is the first value, the second position is the second value; if the first position is the second value, the second position is the first value. Determine the second position of each line relative to the other first target PQM terminals that are non - current PQM terminals. If the first position is the first value, the second position is the first value; if the first position is the second value, the second position is the second value;

[0013] S8. For each line, determine the second confidence vector of the line according to the second position of the line relative to each first target PQM terminal;

[0014] S9. If there is one or more second confidence vectors with a unique maximum value among all the second confidence vectors, the line corresponding to the unique maximum value is taken as the target line, and the PQM terminal on the target line is taken as the fourth target PQM terminal. Then, judge the disturbance result of the second target PQM terminal on the upper-level line of the fourth target PQM terminal and the disturbance result of the third target PQM terminal on the same-level line of the fourth target PQM terminal. If the disturbance results of both the second target PQM terminal and the third target PQM terminal are the second result, the process ends. If the disturbance result of the second target PQM terminal or the disturbance result of the third target PQM terminal is not the second result, for each line, according to the second position of the line relative to the second target PQM terminal, determine the third position of each line relative to the second target PQM terminal. If the second position is the first value, the third position is the second value; if the second position is the second value, the third position is the first value. Determine the third positions of each line relative to each PQM terminal other than the second target PQM terminal. If the second position is the first value, the third position is the first value; if the second position is the second value, the third position is the second value. For each line, according to the third position of the line relative to each PQM terminal, determine the third confidence vector of the line. Take the line corresponding to the unique maximum value in the third confidence vector as the suspected disturbance source. If there is no unique maximum value in the third confidence vector, take the lines corresponding to each maximum value in the third confidence vector as the marked lines, and return to S6.

[0015] The beneficial effects of a power system disturbance source location method provided by the present invention are as follows: The line positions and the positions of PQM terminals are obtained according to the power system topology diagram, and then the disturbance results of each PQM terminal are obtained. If the disturbance result is the first result, then according to the first result, the first positions of each line relative to the first target PQM terminal are determined. According to each of the first positions, the first confidence levels of each line are determined, and the first confidence levels of all lines are combined into a first confidence level vector. At this time, when there is no unique maximum value in the first confidence level vector, it indicates that there are incorrect positioning results among the disturbance results provided by each PQM terminal. Therefore, each PQM terminal in the first target PQM terminal is respectively used as the current PQM terminal, the second positions of each line relative to the current PQM terminal, and the second positions of each line relative to the other first target PQM terminals except the current PQM terminal are determined. According to the second positions of each line relative to each first target PQM terminal (including the current PQM terminal), the second confidence levels of each line are determined, and the second confidence levels of all lines are combined into a second confidence level vector. The unique maximum value is found from each of the second confidence level vectors, and finally the line corresponding to the unique maximum value is used as the disturbance source. Through the present application, since the first position is either the first value or the second value, if the disturbance result corresponding to the first value is incorrect, then the value corresponding to the correct disturbance result is the second value. Therefore, determining the second position according to the first position is equivalent to correcting the incorrect disturbance result to determine whether only one PQM terminal has an incorrect positioning result or multiple PQM terminals have incorrect positioning results. Based on this, the problems that when the existing disturbance source is located, if there is an error in a PQM terminal, the disturbance source location result of the NPQMS system is incorrect, fails, and has low accuracy are solved.

[0016] On the basis of the above technical solution, a power system disturbance source location method of the present invention can be further improved as follows.

[0017] Further, for each line, determining the first confidence level vector of the line according to the first positions of each line relative to each first target PQM terminal includes:

[0018] For each line, the values corresponding to the first positions of each line relative to each first target PQM terminal are accumulated to determine the first confidence level of each line, and the first confidence levels of all lines are combined into a first confidence level vector.

[0019] The beneficial effects of adopting the above further solution are: By judging which line the disturbance source is located on through the first confidence level vector, the position of the disturbance source can be quickly located.

[0020] Further, for each line, according to the second positions of each line relative to each first target PQM terminal, determining the second confidence vector of each line includes:

[0021] For each line, accumulating the values corresponding to the second positions of each line relative to each first target PQM terminal to determine the second confidence of each line, and combining the second confidences of all lines into a second confidence vector.

[0022] The beneficial effect of adopting the above further solution is that: through the current PQM terminal, determining the second position according to the first position and re-obtaining the second confidence vector of the line, and judging which line the disturbance source occurs on through the second confidence vector, the position of the disturbance source can be quickly located.

[0023] Further, if there is no unique maximum value in each of the second confidence vectors; it further includes:

[0024] Judging that the positioning results of at least 3 first target PQM terminals are incorrect.

[0025] The beneficial effect of adopting the above further solution is that: if there is no unique maximum value in each of the second confidence vectors, it indicates that the positioning results of at least 3 first target PQM terminals are incorrect.

[0026] In a second aspect, the present invention provides a power system disturbance source positioning system, including:

[0027] A first acquisition module, configured to acquire a power system topology diagram, the power system topology diagram being a circuit diagram with a hierarchical relationship, the power system topology diagram including a plurality of PQM terminals and the lines between every two adjacent PQM terminals;

[0028] A second acquisition module, configured to acquire the disturbance result of each PQM terminal, the disturbance result being a first result or a second result. For each PQM terminal, the first result represents that the PQM terminal detects a voltage disturbance and the position of the voltage disturbance relative to the PQM terminal, and the second result represents that the PQM terminal does not detect a voltage disturbance, and the voltage disturbance includes the line located at the upper level of the PQM terminal and / or the line located at the lower level of the PQM terminal;

[0029] A third acquisition module, configured to use the PQM terminal corresponding to the first result as the first target PQM terminal. For each first target PQM terminal, determine the first position of each line relative to the first target PQM terminal according to the first result corresponding to the first target PQM terminal, where the first position is a first value or a second value. For each line, the first value indicates that the line is within the system range included in the positioning result of the first target PQM terminal, and the second value indicates that the line is outside the system range included in the positioning result of the first target PQM terminal;

[0030] A fourth acquisition module, configured to determine the first confidence level of each line according to the first position of each line relative to each first target PQM terminal, and combine the first confidence levels of all lines into a first confidence level vector, where the first confidence level vector represents the credibility of each line being a faulty line;

[0031] A first judgment module, configured to, if there is no unique maximum value in the first confidence level vector, execute the function corresponding to the loop module;

[0032] A loop module, configured to use each PQM terminal in the first target PQM terminal as the current PQM terminal, and execute the functions corresponding to the fifth acquisition module, the sixth acquisition module, and the seventh acquisition module;

[0033] A fifth acquisition module, configured to, for each current PQM terminal, determine the second position of each line relative to each current PQM terminal according to the first position of each line relative to each current PQM terminal. If the first position is the first value, the second position is the second value; if the first position is the second value, the second position is the first value. Determine the second position of each line relative to the other first target PQM terminals except the current PQM terminal. If the first position is the first value, the second position is the first value; if the first position is the second value, the second position is the second value;

[0034] A sixth acquisition module, configured to determine the second confidence level of each line according to the second position of each line relative to each first target PQM terminal, and combine the second confidence levels of all lines into a second confidence level vector;

[0035] The seventh acquisition module is used to, if there is one or more second confidence vectors with a unique maximum value among the second confidence vectors, take the line corresponding to the unique maximum value as the target line, and take the PQM terminal on the target line as the fourth target PQM terminal, and judge the disturbance result of the second target PQM terminal on the upper-level line of the fourth target PQM terminal and the disturbance result of the third target PQM terminal on the same-level line as the fourth target PQM terminal. If the disturbance results of both the second target PQM terminal and the third target PQM terminal are the second result, it ends. If the disturbance result of the second target PQM terminal or the disturbance result of the third target PQM terminal is not the second result, then for each line, according to the second position of each line relative to each second target PQM terminal, determine the third position of each line relative to each second target PQM terminal. If the second position is the first value, the third position is the second value; if the second position is the second value, the third position is the first value. Determine the third position of each line relative to each PQM terminal other than the second target PQM terminal. If the second position is the first value, the third position is the first value; if the second position is the second value, the third position is the second value. For each line, according to the third position of each line relative to each PQM terminal, determine the third confidence vector of each line, and take the line corresponding to the unique maximum value in the third confidence vector as the suspected disturbance source. If there is no unique maximum value in the third confidence vector, take the lines corresponding to the third confidence vectors of each maximum value as the marked lines, and execute the functions corresponding to the loop module.

[0036] In a third aspect, the present invention further provides an electronic device, including a memory, a processor, and a program stored on the memory and running on the processor. When the processor executes the program, it implements the steps of a power system disturbance source localization method.

[0037] In a fourth aspect, the present invention further provides a computer-readable storage medium. Instructions are stored in the computer-readable storage medium. When the instructions run on a terminal device, the terminal device is made to execute the steps of a power system disturbance source localization method. Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below with reference to the drawings and embodiments.

[0039] Figure 1 It is a schematic flowchart of a power system disturbance source localization method according to an embodiment of the present invention;

[0040] Figure 2 It is a topology diagram of this power system;

[0041] Figure 3Schematic diagram of the structure of a power system disturbance source location system according to an embodiment of the present invention. Detailed implementation manners

[0042] The following embodiments are further explanations and supplements to the present invention and do not constitute any limitation to the present invention.

[0043] As Figure 1 shown, a power system disturbance source location method according to an embodiment of the present invention includes the following steps:

[0044] S1. Obtain a power system topology diagram, which is a circuit diagram with a hierarchical relationship. The power system topology diagram includes multiple PQM terminals and the lines between every two adjacent PQM terminals.

[0045] Optionally, as Figure 2 shown, it is the obtained power system topology diagram. Among them, between every two adjacent PQM terminals ( Figure 2 where M represents the terminal and the number represents the i-th terminal), there is a line ( Figure 2 where L represents the line and the number represents the i-th line). The lines are divided into a hierarchical relationship. For example, L3, L4, L7, and L8 are parallel lines and are the lower-level lines of L2, and L1 and L2 are series lines and are the upper-level lines of L3, L4, L7, and L8. The PQM terminals are used to detect voltage disturbances in the upper-level lines or lower-level lines. For example, if M1 detects a voltage disturbance in the upper-level line of M1, the voltage disturbance source may be located in L1. If M1 detects a voltage disturbance in the lower-level line of M1, the voltage disturbance source may be located in any one of the lines from L2 to L10.

[0046] S2. Obtain the disturbance result of each PQM terminal. The disturbance result is the first result or the second result. For each PQM terminal, the first result characterizes that the PQM terminal detects a voltage disturbance and the position of the voltage disturbance relative to the PQM terminal, and the second result characterizes that the PQM terminal does not detect a voltage disturbance. The voltage disturbance includes the line located in the upper level of the PQM terminal and / or the line located in the lower level of the PQM terminal.

[0047] S3. Use the PQM terminal corresponding to the first result as the first target PQM terminal. For each first target PQM terminal, determine the first position of each voltage disturbance relative to the first target PQM terminal according to the first result corresponding to the first target PQM terminal. The first position is the first value or the second value. For each line, the first value characterizes that the line is within the system range included in the positioning result of the first target PQM terminal, and the second value characterizes that the line is outside the system range included in the positioning result of the first target PQM terminal.

[0048] Optionally, according to the system topology, each line has a starting position relative to each PQM terminal, and the first target PQM terminal is the PQM terminal that detects a voltage disturbance. Therefore, according to the first result corresponding to the first target PQM terminal, the starting position can be modified to determine the first position of each line relative to the first target PQM terminal. Based on this, the first result includes two cases. One is that the first target PQM terminal detects a voltage disturbance in the upper-level line, and the other is that the first target PQM terminal detects a voltage disturbance in the lower-level line. For example, if the first target PQM terminal M1 detects a voltage disturbance in the upper-level line, the first position of each line relative to the first target PQM terminal M1 can be expressed as: the starting position of L1 relative to M1 is the first value, and the modified first position is the second value; the starting position of L2 relative to M1 is the second value, and the modified first position is the first value. Another example is that if the first target PQM terminal M2 detects a voltage disturbance in the lower-level line, the first position of each line relative to the first target PQM terminal M2 can be expressed as: the starting positions of L1 and L2 relative to M2 are the first value, and the modified first positions are the first value; the starting position of L3 relative to M2 is the second value, and the modified first position is the second value, and so on, to obtain the first position of each line relative to the first target PQM terminal M2.

[0049] The first position refers to whether the line is within the system range included in the positioning result of the first target PQM terminal. One line corresponds to one first position of one target PQM terminal.

[0050] Optionally, the first value and the second value are opposite to each other. For example, the first value is -1 and the second value is 1.

[0051] Optionally, if the PQM terminal does not detect a voltage disturbance, then the first position of each line relative to the PQM terminal that does not detect the voltage disturbance does not need to be considered. For example, if M1 does not detect a voltage disturbance, the first position of each line relative to M1 can be assigned 0, and 0 is used to indicate that no voltage disturbance is detected.

[0052] S4. For each line, according to the first position of each line relative to each first target PQM terminal, determine the first confidence level of the line, and combine the first confidence levels of all lines into a first confidence level vector. The first confidence level vector characterizes the credibility of each line being a faulty line.

[0053] Among them, for each line, through this first position, it is characterized whether the line is within the range of the disturbance source located by the first target PQM terminal. For one line, there can be multiple first positions corresponding to multiple PQM terminals, and through these multiple first positions, the first confidence level of the line being a faulty line can be determined.

[0054] Optionally, for each line, determine the first confidence level of each line according to the first position of each line relative to each first target PQM terminal, and combine the first confidence levels of all lines into a first confidence level vector, including:

[0055] For each line, accumulate the values corresponding to the first positions of each line relative to each first target PQM terminal to determine the first confidence level of each line, and combine the first confidence levels of all lines into a first confidence level vector.

[0056] In this embodiment, for example, L1 is a voltage disturbance source, and the first positions of L1 relative to each first target PQM terminal are the first value, the first value, and the second value respectively. Then the first confidence level of L1 is equal to the sum of the first value, the first value, and the second value. The larger the value of the first confidence level, the greater the probability that L1 fails.

[0057] S5, if there is no unique maximum value in the first confidence level vector, then execute S6.

[0058] Optionally, the unique maximum value means that there is exactly one maximum value in the first confidence level vector. For example, the first confidence level vector of L1 - L10 is represented by vector C as [3, 3, 3, 3, 3, 3, 3, 1, 2, 1]. It can be seen from vector C that the first confidence level values of L1 - L7 are the largest and the same, which indicates that there is no unique maximum value in the first confidence level vector. S6, take each PQM terminal in the first target PQM terminal as the current PQM terminal, and execute S7 - S9.

[0059] In this embodiment, the absence of a unique maximum value in the first confidence level vector indicates that there are incorrect values (the first value or the second value) among the first positions, that is, there are incorrect disturbance results among the disturbance results. It is necessary to take each PQM terminal in the first target PQM terminal as the current PQM terminal and execute S7 - S9 to determine the second position of each line relative to the first target PQM terminal.

[0060] S7, for each current PQM terminal, determine the second position of each line relative to each current PQM terminal according to the first position of each line relative to each current PQM terminal. If the first position is the first value, the second position is the second value; if the first position is the second value, the second position is the first value. Determine the second position of each line relative to the other first target PQM terminals except the current PQM terminal according to the first position of each line relative to the other first target PQM terminals except the current PQM terminal. If the first position is the first value, the second position is the first value; if the first position is the second value, the second position is the second value.

[0061] In this embodiment, for example, in S3, M1 is the first target PQM terminal corresponding to the first result. The first positions of each line relative to the first target PQM terminal are specifically as follows: the first position of L1 relative to M1 is the first value, and the first position of L2 relative to M1 is the second value. At this time, for M1, the second position of each line relative to M1 (the current PQM terminal) is as follows: the second position of L1 relative to M1 is the second value, and the second position of L2 relative to M1 is the first value, that is, the opposite of the first position of L1 relative to M1 is taken to obtain the second position; the second position of each line relative to other first PQM terminals except M1 is the same as the first position.

[0062] S8. For each line, according to the second position of each line relative to each first target PQM terminal, determine the second confidence level of each line, and combine the second confidence levels of all lines into a second confidence level vector.

[0063] In this embodiment, the second position of L1 relative to the current PQM terminal is the first value, and the second positions of L1 relative to each first target PQM terminal except the current PQM terminal include the first value and the second value. Then, the second confidence level of L1 is equal to the sum of all the first values and all the second values.

[0064] S9. If there is one or more second confidence vectors with a unique maximum value among all the second confidence vectors, then use the line corresponding to the unique maximum value as the target line, and use the PQM terminal on this target line as the fourth target PQM terminal. Determine the disturbance result of the second target PQM terminal on the upper-level line of the fourth target PQM terminal, and the disturbance result of the third target PQM terminal on the same-level line as the fourth target PQM terminal. If the disturbance results of both the second target PQM terminal and the third target PQM terminal are the second result, then end. If the disturbance result of the second target PQM terminal or the disturbance result of the third target PQM terminal is not the second result, then for each line, determine the third position of each line relative to each second target PQM terminal according to the second position of each line relative to each second target PQM terminal. If the second position is the first value, the third position is the second value; if the second position is the second value, the third position is the first value. Determine the third position of each line relative to each PQM terminal other than the second target PQM terminal. If the second position is the first value, the third position is the first value; if the second position is the second value, the third position is the second value. For each line, determine the third confidence vector of each line according to the third position of each line relative to each PQM terminal, and use the line corresponding to the unique maximum value in the third confidence vector as the suspected disturbance source. If there is no unique maximum value in the third confidence vector, then use the lines corresponding to the third confidence vectors of each maximum value as the marked lines, and return to S6.

[0065] Optionally, if there is no unique maximum value in the second confidence vectors corresponding to each first target PQM terminal; it further includes:

[0066] Judge that the positioning results of at least 3 first target PQM terminals are incorrect.

[0067] For example, when M1 is used as the current PQM terminal, if the second confidence vectors of L2, L3, and L4 are all the maximum value 3, then use L2, L3, and L4 as the marked lines. When M2 is used as the current PQM terminal, if the second confidence vectors of L2 and L4 are all the maximum value 4, then use L2 and L4 as the marked lines. After S6 is executed and the situation where there is a unique maximum value in the second confidence vector is still not found, then use L2, L3, and L4 as the suspected disturbance sources.

[0068] As Figure 3 shown, a power system disturbance source positioning system according to an embodiment of the present invention includes:

[0069] The first acquisition module 202 is configured to acquire a power system topology diagram, which is a circuit diagram with a hierarchical relationship. The power system topology diagram includes a plurality of PQM terminals and the lines between every two adjacent PQM terminals.

[0070] The second acquisition module 203 is configured to acquire the perturbation result of each PQM terminal. The perturbation result is the first result or the second result. For each PQM terminal, the first result represents that the PQM terminal detects a voltage perturbation and the position of the voltage perturbation relative to the PQM terminal. The second result represents that the PQM terminal does not detect a voltage perturbation. The voltage perturbation includes the lines located above the PQM terminal and / or the lines located below the PQM terminal.

[0071] The third acquisition module 204 is configured to use the PQM terminal corresponding to the first result as the first target PQM terminal. For each first target PQM terminal, according to the first result corresponding to the first target PQM terminal, determine the first position of each line relative to the first target PQM terminal. The first position is the first value or the second value. For each line, the first value represents that the line is within the system range included in the positioning result of the first target PQM terminal, and the second value represents that the line is outside the system range included in the positioning result of the first target PQM terminal.

[0072] The fourth acquisition module 205 is configured to, for each line, determine the first confidence level of each line according to the first position of each line relative to each first target PQM terminal, and combine the first confidence levels of all lines into a first confidence level vector. The first confidence level vector represents the credibility of each line being a faulty line.

[0073] The first judgment module 206 is configured to, if there is no unique maximum value in the first confidence level vector, execute the function corresponding to the loop module.

[0074] The loop module 207 is configured to use each PQM terminal in the first target PQM terminals as the current PQM terminal and execute the functions corresponding to the fifth acquisition module, the sixth acquisition module, and the seventh acquisition module.

[0075] The fifth acquisition module 208 is configured to, for each current PQM terminal, determine the second position of each line relative to each current PQM terminal according to the first position of each line relative to each current PQM terminal. If the first position is the first value, the second position is the second value; if the first position is the second value, the second position is the first value. Determine the second position of each line relative to other first target PQM terminals except the current PQM terminal according to the first position of each line relative to other first target PQM terminals except the current PQM terminal. If the first position is the first value, the second position is the first value; if the first position is the second value, the second position is the second value.

[0076] The sixth acquisition module 209 is configured to, for each line, determine the second confidence vector of each line according to the second position of each line relative to each first target PQM terminal, and combine the second confidences of all lines into a second confidence vector.

[0077] The seventh acquisition module 210 is configured to, if there is one or more second confidence vectors with a unique maximum value among all the second confidence vectors, use the line corresponding to the unique maximum value as the target line, and use the PQM terminal on the target line as the fourth target PQM terminal. Judge the disturbance result of the second target PQM terminal on the upper-level line of the fourth target PQM terminal and the disturbance result of the third target PQM terminal on the same-level line of the fourth target PQM terminal. If the disturbance results of both the second target PQM terminal and the third target PQM terminal are the second result, end. If the disturbance result of the second target PQM terminal or the disturbance result of the third target PQM terminal is not the second result, for each line, determine the third position of each line relative to each second target PQM terminal according to the second position of each line relative to each second target PQM terminal. If the second position is the first value, the third position is the second value; if the second position is the second value, the third position is the first value. Determine the third position of each line relative to other PQM terminals except the second target PQM terminal. If the second position is the first value, the third position is the first value; if the second position is the second value, the third position is the second value. For each line, determine the third confidence of each line according to the third position of each line relative to each PQM terminal, and combine them into a third confidence vector. Use the line corresponding to the unique maximum value in the third confidence vector as the disturbance source. If there is no unique maximum value in the third confidence vector, use the lines corresponding to the third confidence vectors of each maximum value as the marked lines, and return to S6.

[0078] Optionally, the fourth acquisition module 205 includes:

[0079] The first calculation module is configured to, for each line, accumulate the values corresponding to the first positions of each line relative to each first target PQM terminal, determine the first confidence level of each line, and combine the first confidence levels of all lines into a first confidence level vector.

[0080] Optionally, the sixth acquisition module 209 includes:

[0081] The second calculation module is configured to, for each line, accumulate the values corresponding to the second positions of each line relative to each first target PQM terminal, determine the second confidence level of each line, and combine the second confidence levels of all lines into a second confidence level vector.

[0082] Optionally, the seventh acquisition module 210 further includes:

[0083] The second judgment module is configured to judge that the positioning results of at least 3 first target PQM terminals are incorrect.

[0084] A specific application of this embodiment:

[0085] S11, as Figure 2 shown, obtain the power system topology diagram. For each line, the starting position of the line relative to each PQM terminal can be represented by matrix A, where matrix A L×M is represented as:

[0086]

[0087] where A L×M represents matrix A, L i represents the i-th line, M i represents the i-th PQM terminal, +1 indicates that the i-th line is the subordinate line of the i-th PQM terminal, and -1 indicates that the i-th line is the superior line of the i-th PQM terminal.

[0088] Meanwhile, taking the voltage disturbance source located on line L8 as an example, at this time, for PQM terminal M5, the correct disturbance source positioning result is the subordinate line. For M8 to M9, the correct disturbance source positioning results are all the superior lines. At the same time, affected by the longitudinal propagation characteristics of the transformer, generally, transient disturbances can only be transmitted from the high-voltage side of the transformer to the low-voltage side, and it is difficult to be transmitted from the low-voltage side to the high-voltage side. Therefore, there is no voltage fluctuation and no effective positioning result (i.e., the "second result") for the voltages monitored by the PQM terminals other than M5. Assuming that the positioning result of PQM terminal M5 is incorrect and it is the superior line, then S12 is started to be executed.

[0089] S12, obtain the disturbance results of each PQM terminal, and the results are as follows:

[0090] The perturbation results of M1 - M4 and M6 - M7 are the second results, and the perturbation results of M5, M8 - M9 are the first results.

[0091] S13. Take the PQM terminals corresponding to the first results as the first target PQM terminals. For each first target PQM terminal, determine the first positions of each line relative to the first target PQM terminal according to the first results corresponding to the first target PQM terminal.

[0092] Among them, for the lines where the positioning result of PQM terminal M5 is the superior, the superior lines L1 - L7 are within the system range included in the positioning result of M5. The starting position - 1 of lines L1 - L7 needs to be modified to the first position + 1. The inferior lines L9 - L10 are outside the system range included in the positioning result of M5. The starting position + 1 of lines L9 - L10 needs to be modified to the first position - 1. For the lines where the positioning result of PQM terminal M8 is the superior, the superior lines L1 - L8 and L10 are within the system range included in the positioning result of M8. The starting position - 1 of lines L1 - L8 and L10 needs to be modified to the first position + 1. The inferior line L9 is outside the system range included in the positioning result of M8. The starting position + 1 of line L9 needs to be modified to the first position - 1. For the lines where the positioning result of PQM terminal M9 is the superior, the superior lines L1 - L9 are within the system range included in the positioning result of M9. The starting position - 1 of lines L1 - L9 needs to be modified to the first position + 1. The inferior line L10 is outside the system range included in the positioning result of M9. The starting position + 1 of line L10 needs to be modified to the first position - 1.

[0093] Modify matrix A according to the first results (i.e., determine the first positions), and determine the first positions of each voltage perturbation relative to the first target PQM terminal to form matrix B L×M , matrix B L×M is as follows:

[0094]

[0095] Among them, 0 indicates that the PQM terminal does not detect voltage perturbation, so the first positions of each line relative to the PQM terminal that does not detect voltage perturbation do not need to be considered. - 1 represents the first value, and + 1 represents the second value.

[0096] S14. For each line, determine the first confidence level of each line according to the first positions of each line relative to each first target PQM terminal, and combine the first confidence levels of all lines into a first confidence level vector.

[0097] Among them, the first confidence vector is represented by the vector C1, and the vector C1 is [3, 3, 3, 3, 3, 3, 3, 1, -1, -1]. Since there is no unique maximum value in the vector C1, it is necessary to enter S15. Otherwise, the line corresponding to the unique maximum value is the disturbance source, and the positioning result is obtained, and the judgment is directly ended.

[0098] S15. Take each PQM terminal in the first target PQM terminal (i.e., M5, M8, M9) as the current PQM terminal, determine the second position of each voltage disturbance relative to each current PQM terminal, and obtain the second confidence vectors of each voltage disturbance, which are represented by C5, C8, and C9. Among them, C5 represents the second confidence vector of each voltage disturbance when M5 is the current PQM terminal, C8 represents the second confidence vector of each voltage disturbance when M8 is the current PQM terminal, and C9 represents the second confidence vector of each voltage disturbance when M9 is the current PQM terminal;

[0099] In addition, C5 is [1, 1, 1, 1, 1, 1, 1, 3, 1, 1], C8 is [1, 1, 1, 1, 1, 1, 1, -1, 3, -3], and C9 is [1, 1, 1, 1, 1, 1, 1, -1, 1, -3].

[0100] S16. Only C5 among C5, C8, and C9 has the unique maximum value of the second confidence vector. Therefore, the line corresponding to the second confidence vector of the maximum value in C5 is used as the target line, that is, the target line is L8. As Figure 2 shown, the fourth target PQM terminal corresponding to L8 is M5, the PQM terminals corresponding to the lines in parallel with M5 at the same level are M2, M3, and M4, and the PQM terminal corresponding to the upper-level line L2 of M5 is M1.

[0101] S17. From the matrix B L×M it can be seen that M1, M2, M3, and M4 are all second results. Therefore, L8 is used as the disturbance source.

[0102] Optionally, Steps 1 to 7 consider the positioning error of the disturbance source caused by a single PQM terminal being incorrect. If multiple PQM terminals are incorrect, it is still applicable to this application. Specifically as follows:

[0103] S21. As Figure 2 shown, obtain the power system topology diagram. For each line, the starting position of the line for each PQM terminal can be represented by the matrix A, where the matrix A L×M is represented as:

[0104]

[0105] Among them, A L×M represents the matrix A, Li Denote the i-th line as M i Denote the i-th PQM terminal. +1 indicates that the i-th line is a subordinate line of the i-th PQM terminal, and -1 indicates that the i-th line is a superior line of the i-th PQM terminal.

[0106] Meanwhile, taking the voltage disturbance source located on line L2 as an example, at this time, for PQM terminal M1, the correct disturbance source location result is the subordinate line, and for M2 - M9, the correct disturbance source location results are all the superior lines. Assume that the location results of two PQM terminals, M2 and M5, are incorrect and are the subordinate lines.

[0107] S22. Obtain the disturbance results of each PQM terminal, and the results are as follows:

[0108] The disturbance results of M1 - M9 are all the first result.

[0109] S23. Take the PQM terminals corresponding to the first result as the first target PQM terminals. For each first target PQM terminal, determine the first position of each voltage disturbance relative to the first target PQM terminal according to the first result corresponding to the first target PQM terminal;

[0110] Among them, the location result of PQM terminal M1 is the subordinate line. Therefore, the subordinate lines L2 - L10 are within the system range included in the location result of M1, and the starting position +1 of lines L2 - L10 remains as the first position +1. The superior line L1 is outside the system range included in the location result of M1, and the starting position -1 of line L1 remains as the first position -1; the location result of PQM terminal M2 is the subordinate line. Therefore, the subordinate line L3 is within the system range included in the location result of M2, and the starting position +1 of line L3 remains as the first position +1. The superior lines L1 - L2 and L4 - L10 are outside the system range included in the location result of M2, and the starting position -1 of lines L1 - L2 and L4 - L10 remains as the first position -1; the location result of PQM terminal M3 is the superior line. Therefore, the superior lines L1 - L3 and L7 - L10 are within the system range included in the location result of M3, and the starting position -1 of lines L1 - L3 and L7 - L10 needs to be modified to the first position +1. The subordinate lines L4 - L6 are outside the system range included in the location result of M3, and the starting position +1 of lines L4 - L6 needs to be modified to the first position -1; and so on.

[0111] Modify matrix A according to the first result (i.e., determine the first position), and determine the first position of each voltage disturbance relative to the first target PQM terminal to form matrix B L×M , matrix B L×M is as follows:

[0112]

[0113] Among them, -1 represents the first numerical value, and +1 represents the second numerical value.

[0114] S24. For each line, determine the first confidence level of each line according to the first position of each line relative to each first target PQM terminal, and combine the first confidence levels of all lines into a first confidence level vector.

[0115] Among them, the first confidence level vector is represented by the vector C1, and the vector C1 is [3, 5, 7, 3, 1, 1, 3, 7, 5, 5].

[0116] S25. Take each PQM terminal (i.e., M1 - M9) in the first target PQM terminal as the current PQM terminal, determine the second position of each line relative to each current PQM terminal, and obtain the second confidence level vectors of each voltage disturbance, which are represented by the vectors C1 - C9. Among them, C1 represents the second confidence level vector of the line when M1 is the current PQM terminal, and so on;

[0117] In addition, C1 is [5, 3, 5, 1, -1, -1, 1, 5, 3, 3], C2 is [5, 7, 5, 5, 3, 3, 5, 9, 7, 7], C3 is [1, 3, 5, 5, 3, 3, 1, 5, 3, 3], C4 is [1, 3, 5, 1, -1, -1, 5, 5, 3, 3], C5 is [5, 7, 9, 5, 3, 3, 5, 5, 3, 3], C6 is [1, 3, 5, 1, -1, 3, 1, 5, 3, 3], C7 is [1, 3, 5, 1, -1, 3, 1, 5, 3, 3], C8 is [1, 3, 5, 1, -1, -1, 1, 5, 7, 3], C9 is [1, 3, 5, 1, -1, -1, 1, 5, 3, 7].

[0118] S26. There is a unique maximum value in the second confidence level vectors of C2, C5, C8, and C9. Therefore, take L8, L3, L9, and L10 as the target lines, L8 as the target line 1, L3 as the target line 2, L9 as the target line 3, and L10 as the target line 4.

[0119] S27. For the target line 1, the fourth target PQM terminal corresponding to L8 is M5, the PQM terminals corresponding to the lines in parallel with M5 at the same level are M2, M3, and M4, and the PQM terminal corresponding to the line at the upper level of M5 is M1. Since M1 - M4 are all the first results, it is necessary to determine the third position of each line relative to the M5 terminal, and determine that the third confidence level vector of the line is [7, 9, 7, 7, 5, 5, 7, 7, 5, 5]. From this, it can be seen that L2 has the unique maximum value of the third confidence level vector. Therefore, L2 and L8 are used as the final suspected disturbance sources.

[0120] S28. Repeat the operation of S27 for target line 2, target line 3, and target line 4. It can be obtained that the final disturbance source also includes L3. Therefore, when there are two faulty PQM terminals, the suspected disturbance sources are [L2, L3, L8].

[0121] An electronic device according to an embodiment of the present invention includes a memory, a processor, and a program stored in the memory and running on the processor. When the processor executes the program, it implements some or all of the steps of the above-mentioned method for locating a disturbance source in a power system.

[0122] Among them, the electronic device can be selected as a computer, a mobile phone, etc. Correspondingly, its program is a computer software or a mobile phone APP, etc. Moreover, for the various parameters and steps in the above-mentioned electronic device of the present invention, reference can be made to the various parameters and steps in the embodiments of the method for locating a disturbance source in a power system in the foregoing text, and details will not be described herein.

[0123] Those skilled in the art know that the present invention can be implemented as a device, a method, or a computer program product. Therefore, the present disclosure can be specifically implemented in the following forms, that is: it can be completely hardware, can also be completely software (including firmware, resident software, microcode, etc.), and can also be in the form of a combination of hardware and software, which is generally referred to as "circuit", "module", or "device" in this article. In addition, in some embodiments, the present invention can also be implemented in the form of a computer program product in one or more computer-readable media, and the computer-readable media contains computer-readable program code. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor device, apparatus, or device, or any combination of the above.

[0124] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "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 invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without conflict, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0125] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for locating power system disturbance sources, characterized in that, Including the following steps: S1. Obtain a power system topology diagram, which is a circuit diagram with a hierarchical relationship. The power system topology diagram includes multiple PQM terminals and the lines between every two adjacent PQM terminals; S2. Obtain the disturbance result of each PQM terminal. The disturbance result is the first result or the second result. For each PQM terminal, the first result characterizes that the PQM terminal detects a voltage disturbance and the position of the voltage disturbance relative to the PQM terminal, and the second result characterizes that the PQM terminal does not detect a voltage disturbance. The voltage disturbance includes the lines located above the PQM terminal and / or the lines located below the PQM terminal; S3. Take the PQM terminals corresponding to the first result as the first target PQM terminals. For each first target PQM terminal, determine the first position of each line relative to the first target PQM terminal according to the first result corresponding to the first target PQM terminal. The first position is the first value or the second value. For the line, the first value characterizes that the line is within the system range included in the positioning result of the first target PQM terminal, and the second value characterizes that the line is outside the system range included in the positioning result of the first target PQM terminal; S4. For each line, determine the first confidence vector of the line according to the first position of each line relative to each first target PQM terminal. The first confidence vector characterizes the credibility of each line being a faulty line; S5. If there is no unique maximum value in the first confidence vector, execute S6. If there is a unique maximum value in the first confidence vector, the line corresponding to the unique maximum value is the disturbance source and the positioning ends; S6. Take each PQM terminal in the first target PQM terminals as the current PQM terminal and execute S7 - S9; S7. For each current PQM terminal, determine the second position of each line relative to each current PQM terminal according to the first position of each line relative to each current PQM terminal. If the first position is the first value, the second position is the second value. If the first position is the second value, the second position is the first value; determine the second position of each line relative to the other first target PQM terminals that are not the current PQM terminal. If the first position is the first value, the second position is the first value. If the first position is the second value, the second position is the second value; S8. For each line, determine the second confidence vector of the line according to the second position of the line relative to each first target PQM terminal; S9. If there is a unique maximum value in one or more of the second confidence vectors, the line corresponding to the unique maximum value is taken as the target line, and the PQM terminal on the target line is taken as the fourth target PQM terminal. Then, judge the disturbance results of the second target PQM terminal on the upper-level line of the fourth target PQM terminal and the disturbance results of the third target PQM terminal on the same-level line of the fourth target PQM terminal. If the disturbance results of the second target PQM terminal and the third target PQM terminal are both the second result, the process ends. If the disturbance result of the second target PQM terminal or the disturbance result of the third target PQM terminal is not the second result, for each line, according to the second position of the line relative to the second target PQM terminal, determine the third position of each line relative to the second target PQM terminal. If the second position is the first value, the third position is the second value; if the second position is the second value, the third position is the first value. Determine the third positions of each line relative to each PQM terminal other than the second target PQM terminal. If the second position is the first value, the third position is the first value; if the second position is the second value, the third position is the second value. For each line, according to the third positions of the line relative to each PQM terminal, determine the third confidence vector of the line, and take the line corresponding to the unique maximum value in the third confidence vector as the suspected disturbance source. If there is no unique maximum value in the third confidence vector, take the lines corresponding to each maximum value in the third confidence vector as the marked lines, and return to S6.

2. The method according to claim 1, characterized in that, For each line, determine the first confidence vector of the line according to the first positions of each line relative to each first target PQM terminal, including: For each line, accumulate the values corresponding to the first positions of the line relative to each first target PQM terminal to determine the first confidence of each line, and combine the first confidences of all the lines into the first confidence vector.

3. The method according to claim 1, characterized in that, For each line, determine the second confidence vector of the line according to the second positions of the line relative to each PQM terminal, including: For each line, accumulate the values corresponding to the second positions of the line relative to each first target PQM terminal to determine the second confidence of each line, and combine the second confidences of all the lines into the second confidence vector.

4. The method according to claim 1, wherein If there is no unique maximum value in the second confidence vectors corresponding to each first target PQM terminal; it further includes: Judge that the positioning results of at least 3 first target PQM terminals are incorrect.

5. A power system disturbance source location system, characterized in that, Include: The first acquisition module is used to acquire a power system topology diagram, which is a circuit diagram with a hierarchical relationship. The power system topology diagram includes multiple PQM terminals and the lines between every two adjacent PQM terminals. The second acquisition module is used to acquire the disturbance result of each PQM terminal. The disturbance result is the first result or the second result. For each PQM terminal, the first result represents that the PQM terminal detects a voltage disturbance and the position of the voltage disturbance relative to the PQM terminal, and the second result represents that the PQM terminal does not detect a voltage disturbance. The voltage disturbance includes the line located above the PQM terminal and / or the line located below the PQM terminal. The third acquisition module is used to use the PQM terminal corresponding to the first result as the first target PQM terminal. For each first target PQM terminal, according to the first result corresponding to the first target PQM terminal, determine the first position of each line relative to the first target PQM terminal. The first position is the first value or the second value. For each line, the first value represents that the line is within the system range included in the positioning result of the first target PQM terminal, and the second value represents that the line is outside the system range included in the positioning result of the first target PQM terminal. The fourth acquisition module is used to, for each line, determine the first confidence level of each line according to the first position of each line relative to each first target PQM terminal, and combine the first confidence levels of all lines into a first confidence level vector. The first confidence level vector represents the credibility of each line being a faulty line. The first judgment module is used to, if there is no unique maximum value in the first confidence level vector, execute the function corresponding to the loop module; if there is a unique maximum value in the first confidence level vector, the line corresponding to the unique maximum value is the disturbance source, and the positioning ends. The loop module is used to use each PQM terminal in the first target PQM terminals as the current PQM terminal and execute the functions corresponding to the fifth acquisition module, the sixth acquisition module, and the seventh acquisition module. The fifth acquisition module is used to, for each current PQM terminal, determine the second position of each line relative to each current PQM terminal according to the first position of each line relative to each current PQM terminal. If the first position is the first value, the second position is the second value; if the first position is the second value, the second position is the first value. Determine the second position of each line relative to the other first target PQM terminals except the current PQM terminal. If the first position is the first value, the second position is the first value; if the first position is the second value, the second position is the second value. The sixth acquisition module is used to, for each line, determine the second confidence level of each line according to the second position of each line relative to each first target PQM terminal, and combine the second confidence levels of all lines into a second confidence level vector. The seventh acquisition module is configured to, if there is one or more second confidence vectors with a unique maximum value among the second confidence vectors, use the line corresponding to the unique maximum value as the target line, and use the PQM terminal on the target line as the fourth target PQM terminal, and determine the disturbance result of the second target PQM terminal on the upper-level line of the fourth target PQM terminal and the disturbance result of the third target PQM terminal on the same-level line as the fourth target PQM terminal. If the disturbance results of the second target PQM terminal and the third target PQM terminal are both the second result, the process ends. If the disturbance result of the second target PQM terminal or the disturbance result of the third target PQM terminal is not the second result, for each line, determine the third position of each line relative to each second target PQM terminal according to the second position of each line relative to each second target PQM terminal. If the second position is the first value, the third position is the second value; if the second position is the second value, the third position is the first value. Determine the third position of each line relative to each PQM terminal other than the second target PQM terminal. If the second position is the first value, the third position is the first value; if the second position is the second value, the third position is the second value. For each line, determine the third confidence vector of the line according to the third position of each line relative to each PQM terminal, and use the line corresponding to the unique maximum value in the third confidence vector as the disturbance source. If there is no unique maximum value in the third confidence vector, use the lines corresponding to the third confidence vectors of each maximum value as the marked lines, and execute the functions corresponding to the loop module.

6. An electronic device, comprising a memory, a processor, and a program stored on the memory and running on the processor, characterized in that, When the processor executes the program, it implements the steps of a power system disturbance source location method according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, Instructions are stored in the computer-readable storage medium, and when the instructions are run on the terminal device, the terminal device is caused to execute the steps of a power system disturbance source location method according to any one of claims 1 to 4.

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