Method and device for judging short-circuit fault of double circuit HVDC transmission line and computer equipment

Abstract

This application relates to a method, apparatus, and computer equipment for determining short-circuit faults in a double-circuit DC transmission line on the same tower. The method includes: if at least two faulty lines are detected in the double-circuit DC transmission line on the same tower, then, based on the rectifier station end current, inverter station end current, and line grounding current of each faulty line, determining the candidate short-circuit line among the at least two faulty lines; and based on the rectifier station end current, inverter station end current, and loop grounding current of the candidate short-circuit line, determining the target short-circuit line among the candidate short-circuit lines. This method can increase the efficiency and accuracy of target short-circuit line determination and significantly reduce the consumption of manpower and material resources.

Description

Technical Field

[0001] This application relates to the field of power technology, and in particular to a method, apparatus and computer equipment for judging short-circuit faults in a double-circuit DC transmission line on the same tower. Background Technology

[0002] High-voltage direct current (HVDC) transmission systems are widely used for ultra-high voltage, long-distance, and large-capacity HVDC transmission due to their numerous advantages, such as large transmission capacity and flexible power adjustment. Furthermore, double-circuit HVDC transmission systems on the same tower can significantly reduce transmission corridor space; therefore, double-circuit HVDC transmission on the same tower has been widely applied for long-distance, large-capacity HVDC transmission.

[0003] Long-distance power transmission lines are relatively long, and when they encounter extreme weather such as storms, heavy rain, mudslides, earthquakes, and wildfires, short circuits between lines can easily occur, affecting the safe and stable operation of the power transmission system.

[0004] However, when short circuits occur between lines, the only way to determine the impact between them is through manual waveform analysis. This affects the efficiency of fault diagnosis and the timeliness of fault handling, and also consumes a significant amount of manpower and resources. Therefore, how to quickly and efficiently locate the short-circuited lines has become an urgent problem to be solved. Summary of the Invention

[0005] Therefore, it is necessary to provide a method, device, and computer equipment for quickly and efficiently locating short-circuit faults in double-circuit DC transmission lines on the same tower, in response to the above-mentioned technical problems.

[0006] Firstly, this application provides a method for diagnosing short-circuit faults in a double-circuit DC transmission line on the same tower. The method includes:

[0007] If at least two faulty lines are detected in a double-circuit DC transmission line on the same tower, the candidate short-circuit lines among the at least two faulty lines are determined based on the rectifier station end current, inverter station end current and line grounding current of each faulty line.

[0008] The target short-circuit line is determined based on the rectifier station current, inverter station current, and loop grounding current of the candidate short-circuit lines.

[0009] In one embodiment, at least two faulty lines are detected in a double-circuit DC transmission line on the same tower, including:

[0010] Determine the first current difference between the rectifier station current and the inverter station current of each transmission line in a double-circuit DC transmission line on the same tower.

[0011] If the detected first current difference is greater than the first current threshold, the transmission line is determined to be a faulty line.

[0012] In one embodiment, based on the rectifier terminal current, inverter terminal current, and line grounding current of each faulted line, candidate short-circuit lines among at least two faulted lines are determined, including:

[0013] The inverter station current and the line grounding current of each faulted line are summed to obtain the first intermediate current of that faulted line.

[0014] The difference between the rectifier station current and the first intermediate current of the faulty line is calculated to obtain the second current difference of the faulty line.

[0015] If the second current difference of the faulty line reaches the second current threshold, and the line grounding current of the faulty line does not reach the third current threshold, then the faulty line is determined to be a candidate short-circuit line.

[0016] In one embodiment, the target short-circuit line among the candidate short-circuit lines is determined based on the rectifier station end current, inverter station end current, and loop grounding current of the candidate short-circuit lines, including:

[0017] The inverter station terminal current and loop grounding current of each candidate short-circuit line are summed to obtain the second intermediate current of that candidate short-circuit line.

[0018] The difference between the rectifier station current and the second intermediate current of the candidate short-circuited line is calculated to obtain the third current difference of the candidate short-circuited line.

[0019] If the third current difference of the candidate short-circuit line reaches the fourth current threshold, and the loop grounding current of the candidate short-circuit line does not reach the fifth current threshold, then the candidate short-circuit line is determined to be the target short-circuit line.

[0020] In one embodiment, the method further includes:

[0021] Determine the operating mode of the faulty line based on the on / off status of the switch in the circuit where the faulty line is located;

[0022] Determine the line grounding current of the faulty line based on its operating mode.

[0023] In one embodiment, the method further includes:

[0024] Identify the fault circuit corresponding to each candidate short-circuit line;

[0025] Based on the on / off status of each faulty circuit, determine the corresponding operating mode for each faulty circuit;

[0026] Based on the operating mode corresponding to each faulty circuit, determine the circuit grounding current corresponding to each candidate short-circuit line.

[0027] Secondly, this application also provides a short-circuit fault detection device for a double-circuit DC transmission line on the same tower. The device includes:

[0028] The candidate determination module is used to determine the candidate short-circuit line among the at least two faulty lines if at least two faulty lines are detected in a double-circuit DC transmission line on the same tower, based on the rectifier station end current, inverter station end current and line grounding current of each faulty line.

[0029] The target determination module is used to determine the target short-circuit line among the candidate short-circuit lines based on the rectifier station end current, inverter station end current and loop grounding current of the candidate short-circuit lines.

[0030] Thirdly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0031] If at least two faulty lines are detected in a double-circuit DC transmission line on the same tower, the candidate short-circuit lines among the at least two faulty lines are determined based on the rectifier station end current, inverter station end current and line grounding current of each faulty line.

[0032] The target short-circuit line is determined based on the rectifier station current, inverter station current, and loop grounding current of the candidate short-circuit lines.

[0033] Fourthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, performs the following steps:

[0034] If at least two faulty lines are detected in a double-circuit DC transmission line on the same tower, the candidate short-circuit lines among the at least two faulty lines are determined based on the rectifier station end current, inverter station end current and line grounding current of each faulty line.

[0035] The target short-circuit line is determined based on the rectifier station current, inverter station current, and loop grounding current of the candidate short-circuit lines.

[0036] Fifthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, performs the following steps:

[0037] If at least two faulty lines are detected in a double-circuit DC transmission line on the same tower, the candidate short-circuit lines among the at least two faulty lines are determined based on the rectifier station end current, inverter station end current and line grounding current of each faulty line.

[0038] The target short-circuit line is determined based on the rectifier station current, inverter station current, and loop grounding current of the candidate short-circuit lines.

[0039] The aforementioned method, device, and computer equipment for judging short-circuit faults in double-circuit DC transmission lines on the same tower, when detecting at least two faulty lines in the double-circuit DC transmission line on the same tower, determines the candidate short-circuit lines based on the rectifier station end current, inverter station end current, and line grounding current of each faulty line. Then, based on the rectifier station end current, inverter station end current, and loop grounding current of the candidate short-circuit lines, the target short-circuit line is determined. This method can quickly and efficiently determine which two lines have short-circuit faults, saving a lot of manpower and material resources. Attached Figure Description

[0040] Figure 1 This is an application environment diagram of a short-circuit fault judgment method for a double-circuit DC transmission line on the same tower in one embodiment;

[0041] Figure 2 This is a flowchart illustrating a method for determining short-circuit faults in a double-circuit DC transmission line on the same tower, as described in one embodiment.

[0042] Figure 3 This is a schematic diagram of a double-circuit DC transmission line on the same tower in one embodiment;

[0043] Figure 4 This is a schematic diagram of the circuit principle of a dual-circuit DC transmission line on the same tower in one embodiment;

[0044] Figure 5 This is a flowchart illustrating the process of determining a faulty circuit in one embodiment;

[0045] Figure 6 This is a flowchart illustrating the process of determining the operating mode corresponding to a faulty line in one embodiment.

[0046] Figure 7 This is a flowchart illustrating the process of determining the operating mode corresponding to a faulty circuit in one embodiment.

[0047] Figure 8 This is a flowchart illustrating a short-circuit fault detection method for a double-circuit DC transmission line on the same tower, as described in another embodiment.

[0048] Figure 9 This is a structural block diagram of a short-circuit fault detection device for a double-circuit DC transmission line on the same tower, as shown in one embodiment.

[0049] Figure 10 This is a structural block diagram of a short-circuit fault detection device for a double-circuit DC transmission line on the same tower, as shown in another embodiment.

[0050] Figure 11This is a structural block diagram of a short-circuit fault detection device for a double-circuit DC transmission line on the same tower in another embodiment.

[0051] Figure 12 This is a structural block diagram of a short-circuit fault detection device for a double-circuit DC transmission line on the same tower in another embodiment;

[0052] Figure 13 Here is a structural block diagram of a short-circuit fault detection device for a double-circuit DC transmission line on the same tower in one embodiment;

[0053] Figure 14 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0055] The short-circuit fault judgment method for double-circuit DC transmission lines on the same tower provided in this application embodiment can be applied to, for example... Figure 1 In the application environment shown, in one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows. Figure 1 As shown. The computer device includes a processor, memory, and network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores data required for performance analysis of time-domain control elements. The network interface communicates with external terminals via a network connection. When executed by the processor, the computer program implements the short-circuit fault detection method for a double-circuit DC transmission line on the same tower as described in any of the following embodiments.

[0056] In one embodiment, such as Figure 2 As shown, a method for judging short-circuit faults in a double-circuit DC transmission line on the same tower is provided, and this method is applied to... Figure 1 Taking a computer device as an example, the explanation includes the following steps:

[0057] S201 If at least two faulty lines are detected in a double-circuit DC transmission line on the same tower, then the candidate short-circuit lines among the at least two faulty lines are determined based on the rectifier station end current, inverter station end current and line grounding current of each faulty line.

[0058] In this embodiment, the rectifier station current is the starting current of a transmission line, and the inverter station current is the ending current of a transmission line. The line grounding current is defined as follows: When the transmission line operates as a grounded return line, the line grounding current is defined as the current at the grounding electrode of the rectifier station, which can be understood as the grounding current at the starting point of the transmission line. In reality, the grounding point of this grounding current is approximately tens of kilometers away from the rectifier station. When the transmission line operates as a metallic return line, the line grounding current is defined as the current at the grounding point of the inverter station, which can be understood as the grounding current at the ending point of the transmission line. Candidate short-circuit lines are those lines among the faulty lines that may have a short-circuit fault.

[0059] Optional, Figure 3 This is a schematic diagram of a transmission line on the same tower. In this embodiment, a short circuit refers to a physical connection between two lines or a non-physical connection between two lines caused by trees, wildfires along the route, or discharge between lines. Since a short circuit fault occurs between at least two lines, the candidate short circuit line can only be determined based on the rectifier station current, inverter station current, and line grounding current of each faulted line when at least two lines have faults.

[0060] Specifically, based on the rectifier station end current, inverter station end current, and line grounding current of each faulty line, candidate short-circuit lines are determined from at least two faulty lines. This includes: summing the inverter station end current and line grounding current of each faulty line to obtain the first intermediate current of that faulty line; calculating the difference between the rectifier station end current and the first intermediate current of that faulty line to obtain the second current difference of that faulty line; if the second current difference of that faulty line reaches the second current threshold and the line grounding current of that faulty line does not reach the third current threshold, then that faulty line is determined as a candidate short-circuit line.

[0061] Optionally, the inverter station current and the line grounding current of each faulted line can be added together to obtain the first intermediate current; the rectifier station current of the faulted line can be subtracted from the first intermediate current to obtain the second current difference; when the second current difference of the faulted line reaches the second current threshold and the line grounding current of the faulted line does not reach the third current threshold, the faulted line is determined to be a candidate short-circuit line; otherwise, the faulted line is determined not to be a candidate short-circuit line.

[0062] Specifically, in this embodiment, the faulty lines of a double-circuit DC transmission line on the same tower can be determined as candidate short-circuit lines based on formula (1). That is, the faulty lines that satisfy the following formula (1) are candidate short-circuit lines.

[0063]

[0064] Among them, I dLn I is the rectifier station current of a faulty line. dL(n+4) I represents the inverter station current of the faulty line. dLm I is the line grounding current of the faulty line. set1 I is the first current threshold. set2 For the second current threshold, I set3 This is the third current threshold.

[0065] For example, to determine Figure 4 Taking the example of whether line I, pole 1, in the double-circuit DC transmission line shown on the same tower is a candidate short-circuit line, the rectifier station end current I of line I, pole 1, is considered as a candidate short-circuit line. dL1 Substituting I into formula (1) dLn The inverter station terminal current I of line I return pole 1 dL5 Substituting I into formula (1) dL(n+4) The grounding current I of line I returning to pole 1 dL9 or I dL13 Substitute I dLm Determine I dL1 -(I dL5 +I dL9 ) or I dL1 -(I dL5 +I dL13 Is it greater than the second current threshold and I? dL9 or I dL13 If the value is less than the third current threshold, then the I return pole 1 line is a candidate short-circuit line.

[0066] S202. Based on the rectifier station end current, inverter station end current and loop grounding current of the candidate short-circuit lines, determine the target short-circuit line among the candidate short-circuit lines.

[0067] Among them, the circuit grounding current is the current at the grounding point of a transmission circuit. When the transmission line is operated as a ground return line, the line grounding current is defined as the current at the grounding electrode of the rectifier station, which can be understood as the grounding current at the starting point of the transmission line. In reality, the grounding point of this grounding current is about tens of kilometers away from the rectifier station. When the transmission line is operated as a metallic return line, the line grounding current is defined as the current at the grounding point of the inverter station, which can be understood as the grounding current at the ending point of the transmission line.

[0068] Optionally, the target short-circuit line can be determined based on the rectifier station end current, inverter station end current and loop grounding current of the candidate short-circuit line. Usually, the short-circuit fault of the same tower transmission line is a short-circuit between two transmission lines. Therefore, in this scheme, the situation of more than two lines being short-circuited is not considered. It is only necessary to determine two target short-circuit lines from the target short-circuit lines.

[0069] Specifically, based on the rectifier station end current, inverter station end current, and loop grounding current of the candidate short-circuit lines, the target short-circuit line is determined, including: summing the inverter station end current and loop grounding current of each candidate short-circuit line to obtain the second intermediate current of that candidate short-circuit line; subtracting the rectifier station end current of that candidate short-circuit line from the second intermediate current to obtain the third current difference of that candidate short-circuit line; if the third current difference of that candidate short-circuit line reaches the fourth current threshold, and the loop grounding current of that candidate short-circuit line does not reach the fifth current threshold, then that candidate short-circuit line is determined as the target short-circuit line.

[0070] Optionally, the second intermediate current can be obtained by adding the inverter station current to the loop grounding current of each candidate short-circuited line; the third current difference can be obtained by subtracting the second intermediate current from the rectifier station current of the candidate short-circuited line.

[0071] Specifically, in this embodiment, the candidate short-circuit lines of a double-circuit DC transmission line on the same tower can be determined based on formula (2) to determine whether each candidate short-circuit line is the target short-circuit line. That is, the candidate short-circuit lines that satisfy the following formula (2) are the target short-circuit lines.

[0072]

[0073] Among them, I dLn I is the rectifier station terminal current. dL(n+4) I is the inverter station terminal current. dLk For the loop grounding current, I set1 I is the first current threshold. set4 The fourth current threshold, I set5 This is the fifth current threshold.

[0074] For example, to determine Figure 4 Taking the example of whether line I, pole 1, of the double-circuit DC transmission line on the same tower is the target short-circuit line, let's consider the rectifier station terminal current I of line I, pole 1. dL1 Substituting I into formula (2) dLn The inverter station terminal current I of line I return pole 1 dL5 Substituting I into formula (2) dL(n+4) The grounding current I of line I returning to pole 1 dL9 or I dL13 Substitute I dLk Determine I dL1 -(I dL5 +I dL9 ) or I dL1 -(I dL5 +I dL13 Is it greater than the fourth current threshold and I dL9 or IdL13 If the value is less than the fifth current threshold, then the I-circuit 1 line is the target short-circuit line. Using the same method, determine whether other lines meet the above formula (2). When two candidate short-circuit lines meet the above formula (2) at the same time, then both lines are determined to be target short-circuit lines, that is, both lines have been short-circuited. For example, if the I-circuit 1 line and the I-circuit 2 line meet the above formula (2) at the same time, then it is determined that a short circuit has occurred between the I-circuit 1 line and the I-circuit 2 line; if the I-circuit 1 line and the II-circuit 2 line meet the above formula (2) at the same time, then it is determined that a short circuit has occurred between the I-circuit 1 line and the II-circuit 2 line.

[0075] In the above embodiment, after at least two faulty lines are detected, candidate short-circuit lines are first determined by the rectifier station end current, inverter station end current and line grounding current of each faulty line. Then, the target short-circuit line is found by the rectifier station end current, inverter station end current and loop grounding current of the candidate short-circuit lines. This method can accurately and quickly identify the line that has a short-circuit fault and reduce the consumption of manpower and material resources.

[0076] It should be noted that the magnitudes of the first to fifth current thresholds involved in this embodiment can be the same or different, and there is no limitation on this.

[0077] The above embodiment determines the short-circuited line based on the premise that at least two faulty lines exist. Therefore, in this embodiment, if... Figure 5 As shown, the method for determining a line as a faulty line is explained. At least two faulty lines are detected in a double-circuit DC transmission line on the same tower, including:

[0078] S501, determine the first current difference between the rectifier terminal current and the inverter terminal current of each transmission line in a double-circuit DC transmission line on the same tower.

[0079] The first current difference is the difference between the rectifier station current and the inverter station current of each transmission line.

[0080] Optionally, the first current difference can be obtained by subtracting the inverter terminal current of each transmission line from the rectifier terminal current of each transmission line.

[0081] S502, if the detected first current difference is greater than the first current threshold, then the transmission line is determined to be a faulty line.

[0082] The first current threshold is a current value set manually to determine the faulty circuit, and its value is not fixed.

[0083] Optionally, the first current difference is compared with the first current threshold. If the first current difference is less than or equal to the first current threshold, the transmission line is determined to be a faulty line. If the first current difference is greater than the first preset threshold, the transmission line is determined to be a faulty line.

[0084] Specifically, in this embodiment, the method can determine whether each transmission line of a double-circuit DC transmission line on the same tower is a faulty line based on formula (3). That is, the transmission line that satisfies the following formula (1) is a faulty line.

[0085] I dLn -I dL(n+4) >I set1 (3)

[0086] Among them, I dLn Let I be the rectifier terminal current of a certain transmission line. dL(n+4) I is the inverter station current of this transmission line. set1 This is the first current threshold.

[0087] For example, to determine Figure 4 Taking the fault status of line I, pole 1, in the double-circuit DC transmission line shown on the same tower as an example, the rectifier station terminal current I of line I, pole 1, is considered. dL1 Substituting I into formula (3) dLn The inverter station terminal current I of line I return pole 1 dL5 Substituting I into formula (1) dL(n+4) Determine I dL1 with I dL5 Is the difference greater than the first current threshold I? set1 If the condition is met, it indicates that the I-return pole 1 line is a faulty line.

[0088] In the above embodiment, by comparing the first current difference with the first preset threshold, it is determined whether the line is a faulty line. This solution can quickly and accurately determine which line is a faulty line, and reduces the consumption of manpower and material resources.

[0089] In another embodiment, such as Figure 6 As shown, this paper describes how to determine the line grounding current of a faulty line. The method includes:

[0090] S601, determine the corresponding operating mode of the faulty line based on the on / off status of the switch in the transmission line circuit where the faulty line is located.

[0091] Optional, such as Figure 4 As shown, D1-D14 in circuit I represent each switch or disconnector. Based on the on / off status of the switches in the transmission line circuit where the faulty line is located, the corresponding operating mode of the faulty line can be determined.

[0092] Specifically, taking the I-return pole 1 line as an example, such as Figure 4 As shown, when D1, D4, D8, and D11 are closed and the remaining switches are open, the operating mode of the faulty line is the earth return mode. When D1, D3, D7, D8, D10, D12, and D14 are closed and the remaining switches are open, the operating mode of the faulty line is the metal return mode.

[0093] S602, determine the line grounding current of the faulty line according to the operating mode corresponding to the faulty line.

[0094] Optionally, when the operating mode is earth return mode, the line grounding current of the faulted line is the rectifier station grounding electrode line current; when the operating mode is metallic return mode, the line grounding current of the faulted line is the inverter station grounding point current.

[0095] Specifically, taking the I-return pole 1 line as an example, such as Figure 4 As shown, when its operating mode is earth return mode, the line grounding current of the faulty line is I. dL9 When the operating mode is metallic return, the line grounding current of the faulty line is I. dL13 .

[0096] In the above embodiment, the circuit operation mode is determined by the opening and closing of the switch, and the line grounding current is determined according to the operation mode, so that the line grounding current can be adjusted according to the actual situation.

[0097] In another embodiment, such as Figure 7 As shown, this paper describes how to determine the loop grounding current corresponding to a candidate short-circuited line. The method includes:

[0098] S701, determine the fault circuit corresponding to each candidate short-circuit line.

[0099] Specifically, in this embodiment, the transmission line circuit where each candidate short-circuit line is located can be regarded as the fault circuit corresponding to that candidate short-circuit line.

[0100] For example, such as Figure 4 As shown, if the candidate short-circuit line is line I return pole 1, then its corresponding fault circuit is line I return pole 1.

[0101] S702 determines the operating mode corresponding to each fault circuit based on the on / off status of each fault circuit's switch.

[0102] Optional, such as Figure 4 As shown, D1-D14 in circuit I represent switches or disconnectors. Based on the on / off status of the switches or disconnectors in the fault circuit, the corresponding operating mode of the fault circuit can be determined.

[0103] Specifically, taking I-return pole 1 as an example, such as Figure 4 As shown, when D1, D4, D8, and D11 are closed and the remaining switches are open, the operating mode of the fault circuit is the ground return mode. When D1, D3, D7, D8, D10, D12, and D14 are closed and the remaining switches are open, the operating mode of the fault circuit is the metallic return mode.

[0104] S703 determines the circuit grounding current corresponding to each candidate short-circuit line based on the operating mode corresponding to each fault circuit.

[0105] Optionally, when the operating mode is earth return mode, the circuit grounding current of the fault circuit is the rectifier station grounding electrode line current; when the operating mode is metallic return mode, the circuit grounding current of the fault circuit is the inverter station grounding current.

[0106] Specifically, taking I-return pole 1 as an example, such as Figure 4 As shown, when its operating mode is earth return mode, the fault circuit grounding current is I. dL9 When the operating mode is metallic return, the circuit grounding current of the fault circuit is I. dL13 .

[0107] In the above embodiment, the operating mode of the fault circuit is determined by the opening and closing of the switch, and the circuit grounding current is determined according to the operating mode, so that the circuit grounding current can be adjusted according to the actual situation.

[0108] To more comprehensively demonstrate this solution, this embodiment presents an optional method for judging short-circuit faults in a double-circuit DC transmission line on the same tower, such as... Figure 8 As shown.

[0109] S801, determine the first current difference between the rectifier terminal current and the inverter terminal current of each transmission line of a double-circuit DC transmission line on the same tower.

[0110] S802, determine whether the first current difference is greater than the first current threshold. If yes, execute S803; otherwise, execute S813.

[0111] S803 indicates that the transmission line is faulty.

[0112] S804: Determine if the number of faulty lines is greater than 1. If yes, execute S805; otherwise, execute S814.

[0113] S805 sums the inverter station current and the line grounding current for each faulty line to obtain the first intermediate current of that faulty line.

[0114] S806, perform a difference calculation between the rectifier station end current and the first intermediate current of the faulty line to obtain the second current difference of the faulty line.

[0115] S807: Determine whether the second current difference of the faulty line is greater than or equal to the second current threshold, and whether the line grounding current of the faulty line is less than or equal to the third current threshold. If yes, execute S808; otherwise, execute S814.

[0116] S808, the faulty line has been identified as a candidate for short circuit.

[0117] S809 sums up the inverter station current and the loop grounding current for each candidate short-circuit line to obtain the second intermediate current of that candidate short-circuit line.

[0118] S810, perform a difference calculation between the rectifier station end current and the second intermediate current of the candidate short-circuited line to obtain the third current difference of the candidate short-circuited line.

[0119] S811, determine whether the third current difference of the candidate short-circuit line is greater than the fourth current threshold, and whether the loop grounding current of the candidate short-circuit line is less than the fifth current threshold. If yes, execute S812; otherwise, execute S814.

[0120] S812, determine the candidate short-circuit line as the target short-circuit line.

[0121] S813 indicates that this line is not faulty.

[0122] S814 indicates that the faulty line is a ground fault line.

[0123] The specific processes of S801-S814 described above can be found in the description of the above method embodiments. Their implementation principles and technical effects are similar, and will not be repeated here.

[0124] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0125] Based on the same inventive concept, this application also provides a short-circuit fault detection device for a double-circuit DC transmission line on the same tower, used to implement the aforementioned method for detecting short-circuit faults in double-circuit DC transmission lines. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more embodiments of the short-circuit fault detection device for double-circuit DC transmission lines on the same tower provided below can be found in the limitations of the short-circuit fault detection method for double-circuit DC transmission lines on the same tower described above, and will not be repeated here.

[0126] In one embodiment, such as Figure 9 As shown, a short-circuit fault detection device for a double-circuit DC transmission line on the same tower is provided, comprising: a candidate determination module 90 and a target determination module 91, wherein:

[0127] The candidate determination module 90 is used to determine the candidate short-circuit line among the at least two fault lines if at least two fault lines are detected in a double-circuit DC transmission line on the same tower, based on the rectifier station end current, inverter station end current and line grounding current of each fault line.

[0128] The target determination module 91 is used to determine the target short-circuit line among the candidate short-circuit lines based on the rectifier station end current, inverter station end current and loop grounding current of the candidate short-circuit lines.

[0129] In another embodiment, such as Figure 10 As shown above, Figure 9 The short-circuit fault detection device for a double-circuit DC transmission line on the same tower also includes:

[0130] The fault determination module 92 is used to determine the first current difference between the rectifier station end current and the inverter station end current of each transmission line of the double-circuit DC transmission line on the same tower; if the first current difference is detected to be less than the first current threshold, the transmission line is determined to be a faulty line.

[0131] In another embodiment, such as Figure 11 As shown above, Figure 9 The candidate determination module 90 also includes:

[0132] The first determining unit 900 sums the inverter station current and the line grounding current of each faulted line to obtain the first intermediate current of the faulted line.

[0133] The second determining unit 901 is used to perform a difference calculation between the rectifier station end current and the first intermediate current of the faulty line to obtain the second current difference of the faulty line.

[0134] The candidate determination unit 902 is used to determine the faulty line as a candidate short-circuit line if the second current difference of the faulty line reaches the second current threshold and the line grounding current of the faulty line does not reach the third current threshold.

[0135] In another embodiment, such as Figure 12 As shown above, Figure 9 The target determination module 91 also includes:

[0136] The third determining unit 910 is used to sum the inverter station end current and the loop grounding current of each candidate short-circuit line to obtain the second intermediate current of the candidate short-circuit line.

[0137] The fourth determining unit 911 is used to perform a difference calculation between the rectifier station end current and the second intermediate current of the candidate short-circuited line to obtain the third current difference of the candidate short-circuited line.

[0138] The target determination unit 912 is used to determine the candidate short-circuit line as the target short-circuit line if the third current difference of the candidate short-circuit line reaches the fourth current threshold and the loop grounding current of the candidate short-circuit line does not reach the fifth current threshold.

[0139] In another embodiment, such as Figure 13 As shown above, Figure 9 The short-circuit fault detection device for a double-circuit DC transmission line on the same tower also includes:

[0140] The grounding determination module 93 is used to determine the operating mode of the faulty line based on the on / off status of the switch in the transmission line circuit where the faulty line is located; and to determine the line grounding current of the faulty line based on the operating mode of the faulty line.

[0141] In another embodiment, the ground current determination module 93 is further configured to:

[0142] Identify the fault circuit corresponding to each candidate short-circuit line; determine the operating mode corresponding to each fault circuit based on the switch status of each fault circuit; determine the circuit grounding current corresponding to each candidate short-circuit line based on the operating mode corresponding to each fault circuit.

[0143] The various modules in the aforementioned short-circuit fault detection device for double-circuit DC transmission lines on the same tower can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0144] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 14 As shown. The computer device includes a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When executed by the processor, the computer program implements a method for determining short-circuit faults in a double-circuit DC transmission line on the same tower. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0145] Those skilled in the art will understand that Figure 14 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0146] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0147] If at least two faulty lines are detected in a double-circuit DC transmission line on the same tower, the candidate short-circuit lines among the at least two faulty lines are determined based on the rectifier station end current, inverter station end current and line grounding current of each faulty line.

[0148] The target short-circuit line is determined based on the rectifier station current, inverter station current, and loop grounding current of the candidate short-circuit lines.

[0149] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0150] Determine the first current difference between the rectifier station current and the inverter station current of each transmission line in a double-circuit DC transmission line on the same tower; if the first current difference is detected to be greater than the first current threshold, then the transmission line is determined to be a faulty line.

[0151] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0152] The inverter station current and the line grounding current of each faulted line are summed to obtain the first intermediate current of the faulted line; the difference between the rectifier station current and the first intermediate current of the faulted line is calculated to obtain the second current difference of the faulted line; if the second current difference of the faulted line reaches the second current threshold and the line grounding current of the faulted line does not reach the third current threshold, then the faulted line is determined to be a candidate short-circuit line.

[0153] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0154] The inverter station end current and loop grounding current of each candidate short-circuit line are summed to obtain the second intermediate current of the candidate short-circuit line; the difference between the rectifier station end current and the second intermediate current of the candidate short-circuit line is calculated to obtain the third current difference of the candidate short-circuit line; if the third current difference of the candidate short-circuit line reaches the fourth current threshold and the loop grounding current of the candidate short-circuit line does not reach the fifth current threshold, then the candidate short-circuit line is determined as the target short-circuit line.

[0155] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0156] Determine the operating mode of the faulty line based on the on / off status of the switch in the transmission line circuit where the faulty line is located; determine the line grounding current of the faulty line based on the operating mode of the faulty line.

[0157] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0158] Identify the fault circuit corresponding to each candidate short-circuit line; determine the operating mode corresponding to each fault circuit based on the switch status of each fault circuit; determine the circuit grounding current corresponding to each candidate short-circuit line based on the operating mode corresponding to each fault circuit.

[0159] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0160] If at least two faulty lines are detected in a double-circuit DC transmission line on the same tower, the candidate short-circuit lines among the at least two faulty lines are determined based on the rectifier station end current, inverter station end current and line grounding current of each faulty line.

[0161] The target short-circuit line is determined based on the rectifier station current, inverter station current, and loop grounding current of the candidate short-circuit lines.

[0162] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0163] Determine the first current difference between the rectifier station current and the inverter station current of each transmission line in a double-circuit DC transmission line on the same tower; if the first current difference is detected to be greater than the first current threshold, then the transmission line is determined to be a faulty line.

[0164] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0165] The inverter station current and the line grounding current of each faulted line are summed to obtain the first intermediate current of the faulted line; the difference between the rectifier station current and the first intermediate current of the faulted line is calculated to obtain the second current difference of the faulted line; if the second current difference of the faulted line reaches the second current threshold and the line grounding current of the faulted line does not reach the third current threshold, then the faulted line is determined to be a candidate short-circuit line.

[0166] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0167] The inverter station end current and loop grounding current of each candidate short-circuit line are summed to obtain the second intermediate current of the candidate short-circuit line; the difference between the rectifier station end current and the second intermediate current of the candidate short-circuit line is calculated to obtain the third current difference of the candidate short-circuit line; if the third current difference of the candidate short-circuit line reaches the fourth current threshold and the loop grounding current of the candidate short-circuit line does not reach the fifth current threshold, then the candidate short-circuit line is determined as the target short-circuit line.

[0168] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0169] Determine the operating mode of the faulty line based on the on / off status of the switch in the transmission line circuit where the faulty line is located; determine the line grounding current of the faulty line based on the operating mode of the faulty line.

[0170] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0171] Identify the fault circuit corresponding to each candidate short-circuit line; determine the operating mode corresponding to each fault circuit based on the switch status of each fault circuit; determine the circuit grounding current corresponding to each candidate short-circuit line based on the operating mode corresponding to each fault circuit.

[0172] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0173] If at least two faulty lines are detected in a double-circuit DC transmission line on the same tower, the candidate short-circuit lines among the at least two faulty lines are determined based on the rectifier station end current, inverter station end current and line grounding current of each faulty line.

[0174] The target short-circuit line is determined based on the rectifier station current, inverter station current, and loop grounding current of the candidate short-circuit lines.

[0175] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0176] Determine the first current difference between the rectifier station current and the inverter station current of each transmission line in a double-circuit DC transmission line on the same tower; if the first current difference is detected to be greater than the first current threshold, then the transmission line is determined to be a faulty line.

[0177] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0178] The inverter station current and the line grounding current of each faulted line are summed to obtain the first intermediate current of the faulted line; the difference between the rectifier station current and the first intermediate current of the faulted line is calculated to obtain the second current difference of the faulted line; if the second current difference of the faulted line reaches the second current threshold and the line grounding current of the faulted line does not reach the third current threshold, then the faulted line is determined to be a candidate short-circuit line.

[0179] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0180] The inverter station end current and loop grounding current of each candidate short-circuit line are summed to obtain the second intermediate current of the candidate short-circuit line; the difference between the rectifier station end current and the second intermediate current of the candidate short-circuit line is calculated to obtain the third current difference of the candidate short-circuit line; if the third current difference of the candidate short-circuit line reaches the fourth current threshold and the loop grounding current of the candidate short-circuit line does not reach the fifth current threshold, then the candidate short-circuit line is determined as the target short-circuit line.

[0181] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0182] Determine the operating mode of the faulty line based on the on / off status of the switch in the transmission line circuit where the faulty line is located; determine the line grounding current of the faulty line based on the operating mode of the faulty line.

[0183] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0184] Identify the fault circuit corresponding to each candidate short-circuit line; determine the operating mode corresponding to each fault circuit based on the switch status of each fault circuit; determine the circuit grounding current corresponding to each candidate short-circuit line based on the operating mode corresponding to each fault circuit.

[0185] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0186] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0187] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for judging short-circuit faults in a double-circuit DC transmission line on the same tower, characterized in that, The method includes: If at least two faulty lines are detected in a double-circuit DC transmission line on the same tower, the inverter station current and the line grounding current of each faulty line are summed to obtain the first intermediate current of that faulty line. The difference between the rectifier station current and the first intermediate current of the faulty line is calculated to obtain the second current difference of the faulty line. If the second current difference of the faulty line reaches the second current threshold and the line grounding current of the faulty line does not reach the third current threshold, then the faulty line is determined to be a candidate short-circuit line. The inverter station terminal current and loop grounding current of each candidate short-circuit line are summed to obtain the second intermediate current of that candidate short-circuit line. The difference between the rectifier station current and the second intermediate current of the candidate short-circuited line is calculated to obtain the third current difference of the candidate short-circuited line. If the third current difference of the candidate short-circuit line reaches the fourth current threshold, and the loop grounding current of the candidate short-circuit line does not reach the fifth current threshold, then the candidate short-circuit line is determined to be the target short-circuit line.

2. The method according to claim 1, characterized in that, The detection of at least two faulty lines in a double-circuit DC transmission line on the same tower includes: Determine the first current difference between the rectifier station current and the inverter station current of each transmission line in a double-circuit DC transmission line on the same tower. If the detected first current difference is greater than the first current threshold, the transmission line is determined to be a faulty line.

3. The method according to claims 1-2, characterized in that, The method further includes: The operating mode of the faulty line is determined based on the on / off status of the switch in the circuit where the faulty line is located. The line grounding current of the faulty line is determined based on the operating mode corresponding to the faulty line.

4. The method according to claims 1-2, characterized in that, The method further includes: Identify the fault circuit corresponding to each candidate short-circuit line; Based on the on / off status of each faulty circuit, determine the corresponding operating mode for each faulty circuit; Based on the operating mode corresponding to each faulty circuit, determine the circuit grounding current corresponding to each candidate short-circuit line.

5. A short-circuit fault detection device for a double-circuit DC transmission line on the same tower, characterized in that, The device includes: If the candidate determination module detects at least two faulty lines in a double-circuit DC transmission line on the same tower, it sums the inverter station current and the line grounding current of each faulty line to obtain the first intermediate current of the faulty line; it then calculates the difference between the rectifier station current and the first intermediate current of the faulty line to obtain the second current difference of the faulty line; if the second current difference of the faulty line reaches the second current threshold and the line grounding current of the faulty line does not reach the third current threshold, then the faulty line is determined to be a candidate short-circuit line. The target determination module sums the inverter station end current and the loop grounding current of each candidate short-circuit line to obtain the second intermediate current of the candidate short-circuit line; it then calculates the difference between the rectifier station end current and the second intermediate current of the candidate short-circuit line to obtain the third current difference of the candidate short-circuit line; if the third current difference of the candidate short-circuit line reaches the fourth current threshold and the loop grounding current of the candidate short-circuit line does not reach the fifth current threshold, then the candidate short-circuit line is determined to be the target short-circuit line.

6. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 4.

8. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 4.

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