Abnormality monitoring method, device, equipment and program product for direct current transmission line

Abstract

The application relates to an abnormality monitoring method, device, equipment and program product of a direct current transmission line. The method comprises the following steps: acquiring a rectifier station current, an inverter station current and a direct current line voltage in the direct current transmission line; determining a line current difference between the rectifier station and the inverter station in the direct current transmission line according to the rectifier station current and the inverter station current; and determining abnormality information of the direct current transmission line according to the direct current line voltage and the line current difference. The method can realize accurate monitoring of the abnormality of the direct current transmission line.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system relay protection, and in particular to an abnormal monitoring method, device, equipment and program product of a DC transmission line. BACKGROUND

[0002] Compared with AC transmission systems, high-voltage DC transmission systems have the advantages of large transmission capacity, long transmission distance, and low loss, and are widely used in long-distance power transmission, large-area power grid interconnection, underground cable transmission, etc. High-voltage DC transmission lines shoulder the heavy responsibility of power transmission in energy production and load center time periods. The transmission distance is long, the operating conditions are poor, and the failure rate is relatively higher than that of other parts of the DC system, accounting for about 50% of the DC system failures. Therefore, high-performance high-voltage DC transmission line protection is of great significance to improve the safety and stability of the entire power grid.

[0003] The longitudinal differential protection is included in the DC transmission line protection. As a backup protection of the DC transmission line, the longitudinal differential protection has good ability to reflect high-resistance grounding faults, but in the case of current measurement faults or abnormal inter-station communication, relying only on differential current may lead to inaccurate protection action. SUMMARY

[0004] Therefore, it is necessary to provide an abnormal monitoring method, device, equipment and program product of a DC transmission line, which can accurately monitor the abnormal conditions of the DC transmission line.

[0005] In a first aspect, the present application provides an abnormal monitoring method of a DC transmission line, which comprises:

[0006] obtaining a rectifier station current, an inverter station current and a DC line voltage in the DC transmission line;

[0007] determining a line current difference between the rectifier station and the inverter station in the DC transmission line according to the rectifier station current and the inverter station current;

[0008] determining abnormal information of the DC transmission line according to the DC line voltage and the line current difference.

[0009] In one embodiment, determining the abnormal information of the DC transmission line according to the DC line voltage and the line current difference comprises:

[0010] if the line current difference is greater than a current threshold value and the DC line voltage is less than a voltage threshold value, it is determined that there is a short-circuit fault in the DC transmission line; if the line current difference is greater than the current threshold value and the DC line voltage is greater than or equal to the voltage threshold value, it is determined that there is a current measurement fault or an inter-station transmission abnormality in the DC transmission line.

[0011] In one of the embodiments, in the case that there is a short-circuit fault in the DC transmission line, the method further comprises:

[0012] reducing the target current in the DC transmission line and the DC line voltage to zero, and after the target current in the DC transmission line and the DC line voltage are reduced to zero, restoring the target current in the DC transmission line and the DC line voltage to the state before the short-circuit fault; wherein the target current comprises the rectifier station current and the inverter station current.

[0013] In one of the embodiments, in the case that there is a current measurement fault or an inter-station transmission anomaly in the DC transmission line, the method further comprises:

[0014] outputting alarm information; wherein the alarm information comprises the fault type and the fault repair measure.

[0015] In one of the embodiments, obtaining the rectifier station current and the inverter station current in the DC transmission line comprises:

[0016] collecting the rectifier station current and the inverter station current in the DC transmission line through inter-station communication between the rectifier station and the inverter station in the DC transmission line.

[0017] In one of the embodiments, it comprises:

[0018] determining the current threshold and the voltage threshold according to the transmission performance between the rectifier station and the inverter station in the DC transmission line.

[0019] In a second aspect, the application further provides an abnormality monitoring device for a DC transmission line, which comprises:

[0020] an obtaining module for obtaining the rectifier station current, the inverter station current and the DC line voltage in the DC transmission line;

[0021] a difference determining module for determining the line current difference between the rectifier station and the inverter station in the DC transmission line according to the rectifier station current and the inverter station current;

[0022] an abnormality determining module for determining the abnormality information of the DC transmission line according to the DC line voltage and the line current difference.

[0023] In a third aspect, the application further provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0024] obtaining the rectifier station current, the inverter station current and the DC line voltage in the DC transmission line;

[0025] determining the line current difference between the rectifier station and the inverter station in the DC transmission line according to the rectifier station current and the inverter station current;

[0026] determine the abnormal information of the DC power transmission line according to the DC line voltage and the line current difference.

[0027] In a fourth aspect, the present application also provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the following steps:

[0028] obtaining the rectifier station current, the inverter station current and the DC line voltage in the DC power transmission line;

[0029] determining the line current difference between the rectifier station and the inverter station in the DC power transmission line according to the rectifier station current and the inverter station current;

[0030] determining the abnormal information of the DC power transmission line according to the DC line voltage and the line current difference.

[0031] In a fifth aspect, the present application also provides a computer program product, which comprises a computer program, and the computer program is executed by a processor to implement the following steps:

[0032] obtaining the rectifier station current, the inverter station current and the DC line voltage in the DC power transmission line;

[0033] determining the line current difference between the rectifier station and the inverter station in the DC power transmission line according to the rectifier station current and the inverter station current;

[0034] determining the abnormal information of the DC power transmission line according to the DC line voltage and the line current difference.

[0035] The abnormal monitoring method, device, equipment and program product of the DC power transmission line provided by the present application can provide data basis for simultaneously monitoring the DC power transmission line from the current dimension and the voltage dimension by obtaining the rectifier station current, the inverter station current and the DC line voltage in the DC power transmission line. Then, the line current difference between the rectifier station and the inverter station in the DC power transmission line can be determined according to the rectifier station current and the inverter station current, which provides a new idea for judging the state of the DC power transmission line. Further, the abnormal information of the DC power transmission line can be determined according to the DC line voltage and the line current difference, which combines the voltage condition and the current condition, and finally realizes accurate abnormal monitoring. The present application introduces the DC line voltage to provide a new idea for judging the abnormal condition of the DC power transmission line. Moreover, the DC power transmission line is accurately monitored by comprehensively analyzing the DC line voltage and the line current difference between the rectifier station and the inverter station. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor based on these drawings.

[0037] Figure 1 An application environment diagram of the abnormal monitoring method of the DC transmission line provided in the embodiments of the present application;

[0038] Figure 2 A flowchart of the abnormal monitoring of the DC transmission line provided in the embodiments of the present application;

[0039] Figure 3 A structure diagram of the single pole grounding fault of the bipolar DC transmission line provided in the embodiments of the present application;

[0040] Figure 4 A flowchart of determining the abnormal information of the DC transmission line provided in the embodiments of the present application;

[0041] Figure 5 A recording wave diagram of the grounding fault of the DC transmission line provided in the embodiments of the present application;

[0042] Figure 6 A recording wave diagram of the current measurement fault or the inter-station transmission abnormality of the DC transmission line provided in the embodiments of the present application;

[0043] Figure 7 A flowchart of another abnormal monitoring method of the DC transmission line provided in the embodiments of the present application;

[0044] Figure 8 A structure block diagram of the abnormal monitoring device of the DC transmission line provided in the embodiments of the present application;

[0045] Figure 9 A structure block diagram of another abnormal monitoring device of the DC transmission line provided in the embodiments of the present application;

[0046] Figure 10 An internal structure diagram of the computer device provided in the embodiments of the present application. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0048] The abnormal monitoring method of the DC power transmission line provided by the embodiments of the present application can be applied to the application environment as shown in Figure 1 . The terminal 102 communicates with the server 104 through a network. The data storage system can store data required to be processed by the server 104. The data storage system can be integrated on the server 104, or placed on a cloud or other network server. The server 104 can obtain the rectifier station current, the inverter station current and the DC line voltage in the DC power transmission line. Then, the line current difference between the rectifier station and the inverter station in the DC power transmission line can be determined according to the rectifier station current and the inverter station current. Further, the abnormal information of the DC power transmission line can be determined according to the DC line voltage and the line current difference, and the abnormal information can be displayed through the terminal 102 to remind the staff to investigate. The terminal 102 can be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, Internet of Things devices and portable wearable devices. The Internet of Things device can be a smart speaker, a smart television, a smart air conditioner, a smart vehicle device, etc. The portable wearable device can be a smart watch, a smart bracelet, a head-mounted device, etc. The server 104 can be implemented by an independent server or a server cluster composed of multiple servers.

[0049] In an exemplary embodiment, as shown in Figure 2 , an abnormal monitoring method of a DC power transmission line is provided. Taking the server 104 in Figure 1 as an example, the method can include the following steps:

[0050] S201, obtaining the rectifier station current, the inverter station current and the DC line voltage in the DC power transmission line.

[0051] The rectifier station current can be the current output by the rectifier station. The inverter station current can be the current output by the inverter station. The DC line voltage can refer to the voltage at any position in the DC power transmission line, which is related to the output DC voltage, the resistance of the DC power transmission line, the inductance of the DC power transmission line, the load condition and the adjustment of the inverter station, etc. For example, as shown in Figure 3 , the abnormal monitoring is performed on the DC power transmission line in bipolar operation.

[0052] Exemplarily, the rectifier station current, the inverter station current and the DC line voltage can be collected by the current measuring device and the voltage measuring device installed in the rectifier station and the inverter station in the DC power transmission line, and the collected rectifier station current, inverter station current and DC line voltage can be saved to the data storage system on the server 104. Then, the server 104 can directly obtain the rectifier station current, the inverter station current and the DC line voltage in the DC power transmission line through the data storage system.

[0053] S202, determine a line current difference between the rectifier station and the inverter station in the DC power transmission line according to the rectifier station current and the inverter station current.

[0054] The line current difference can represent a current loss value caused by the DC current passing through the line between the rectifier station and the inverter station.

[0055] For example, the rectifier station current and the inverter station current can be subtracted, and the absolute value of the subtraction result can be determined as the line current difference between the rectifier station and the inverter station in the DC power transmission line.

[0056] S203, determine abnormal information of the DC power transmission line according to the DC line voltage and the line current difference.

[0057] For example, the fluctuation of the voltage in the DC power transmission line can be determined according to the DC line voltage, and the current diversion in the DC power transmission line can be determined in combination with the line current difference. Then, whether the DC power transmission line has a fault or an abnormality can be determined based on the fluctuation of the voltage and the current diversion, and the fault or the abnormality can be sent to relevant staff for line troubleshooting. For example, if the voltage fluctuation amplitude is too large and the current diversion is too much, it can be determined that the DC power transmission line has a fault.

[0058] The above abnormal monitoring method of the DC power transmission line provides a data basis for simultaneously monitoring the DC power transmission line from the current dimension and the voltage dimension by obtaining the rectifier station current, the inverter station current, and the DC line voltage. Then, the line current difference between the rectifier station and the inverter station in the DC power transmission line can be determined according to the rectifier station current and the inverter station current, which provides a way to determine the state of the DC power transmission line. Further, the abnormal information of the DC power transmission line can be determined according to the DC line voltage and the line current difference, the voltage condition and the current condition are combined, and finally the accurate abnormal monitoring is realized. The present scheme introduces the DC line voltage to provide a new way to determine the abnormal condition of the DC power transmission line. In addition, the DC line voltage and the line current difference between the rectifier station and the inverter station are comprehensively analyzed to realize the accurate monitoring of the abnormal condition of the DC power transmission line.

[0059] On the basis of the above embodiments, the present embodiment explains the above embodiment S203 in detail. Specifically, the present embodiment involves a process of determining the abnormal information of the DC power transmission line, as shown in Figure 4 The process specifically includes the following steps:

[0060] S401, if the line current difference is greater than a current threshold value, and the DC line voltage is less than a voltage threshold value, it is determined that the DC power transmission line has a short circuit fault.

[0061] The current threshold value can represent the maximum current consumed by the line loss under normal conditions, and the voltage threshold value can represent the minimum voltage in the DC transmission line under normal conditions.

[0062] Optionally, the current threshold value and the voltage threshold value can be determined according to the transmission performance between the rectifier station and the inverter station in the DC transmission line.

[0063] For example, the maximum current consumed by the line loss and the minimum voltage under normal transmission conditions can be determined according to the distance between the rectifier station and the inverter station in the DC transmission line, the resistance of the DC transmission line, the inductance of the DC transmission line, and the load conditions, etc. For example, the current fluctuation between the rectifier station and the inverter station in the DC transmission line under normal operation is about 10A, and the current threshold value can be set to 30A to prevent the current from causing protection misoperation under normal fluctuation.

[0064] For example, the line current difference value can be directly compared with the current threshold value, and the DC line voltage can be compared with the voltage threshold value. If the line current difference value is greater than the current threshold value, it can be indicated that the change of the current exceeds the normal range. If the DC line voltage is less than the voltage threshold value, it can be indicated that the voltage state is abnormal, and the fluctuation amplitude of the voltage exceeds the normal range. If the line current difference value is greater than the current threshold value at the same time, and the DC line voltage is less than the voltage threshold value, that is, the line current shunt abnormally increases and the voltage abnormally decreases, indicating that there is a certain form of short circuit in the DC transmission line, it can be determined that there is a short circuit fault in the DC transmission line.

[0065] It should be noted that in the case of a short circuit fault in the DC transmission line, the target current in the DC transmission line and the DC line voltage can be reduced to zero, and after the target current in the DC transmission line and the DC line voltage are reduced to zero, the target current in the DC transmission line and the DC line voltage can be restored to the state before the short circuit fault.

[0066] The target current includes the rectifier station current and the inverter station current.

[0067] For example, as shown in Figure 3 and Figure 5 If the ground fault occurs in the pole 1 DC transmission line in Figure 3 , the ground fault point current IdF of the DC transmission line flows back to the DC system through the grounding poles of the rectifier station and the inverter station, causing the rectifier side DC line current (i.e. rectifier station current - IdL) to be significantly greater than the inverter side DC line current (i.e. inverter station current - IdL_os), and the DC line voltage to be significantly lower than the rated operating voltage. Correspondingly, the relevant DC line recording wave when the pole 1 DC transmission line has a ground fault is as shown in Figure 5As shown. Further, the fault restart function can be set to reduce the target current in the DC transmission line and the DC line voltage to zero, and after the target current in the DC transmission line and the DC line voltage are reduced to zero, the target current in the DC transmission line and the DC line voltage are restored to the state before the short-circuit fault, that is, in the case of a short-circuit fault in the DC transmission line, the fault restart function can be directly started. It should be noted that, in order to prevent protection misoperation, the delay of the action (i.e. triggering the fault restart function) can be set to be relatively long, such as 100 ms.

[0068] S402, if the line current difference is greater than the current threshold value, and the DC line voltage is greater than or equal to the voltage threshold value, it is determined that the DC transmission line has a current measurement fault or an inter-station transmission abnormality.

[0069] Wherein, the current measurement fault can represent that the current measurement device fails to cause abnormal measurement of the current value; the inter-station transmission abnormality can represent that the rectifier station and the inverter station in the DC transmission line have an abnormality in the process of inter-station transmission, such as data loss, data error, transmission delay, connection interruption, network basic equipment fault condition.

[0070] For example, the line current difference can be directly compared with the current threshold value, and the DC line voltage can be compared with the voltage threshold value; if the line current difference is greater than the current threshold value, it can be represented that the change of the current exceeds the normal range, and if the DC line voltage is greater than or equal to the voltage threshold value, it can be represented that the DC transmission line is in a normal working state in terms of voltage; if the line current difference is greater than the current threshold value at the same time, the DC line voltage is greater than or equal to the voltage threshold value, that is, the line shunt of the current abnormally increases and the voltage is normal, indicating that there is a current measurement fault or an inter-station transmission abnormality in the DC transmission line.

[0071] For example, as shown in Figure 3 and Figure 6 If a current measurement fault or an inter-station transmission abnormality occurs in the pole 1 DC transmission line in Figure 3 , the rectifier side DC line current (i.e. the rectifier station current) is greater than the inverter side DC line current (i.e. the inverter station current), but the DC line voltage is normal, that is, when the pole 1 DC transmission line has a current measurement fault or an inter-station transmission abnormality, the related DC line recording wave is as shown in Figure 6 That is, by considering the change of the DC line voltage, the short-circuit fault of the DC transmission line is distinguished from the current measurement fault or the inter-station transmission abnormality of the DC transmission line, and the false protection action caused by the current measurement fault or the inter-station transmission abnormality is eliminated.

[0072] It should be noted that in the case of a current measurement fault or an inter-station transmission abnormality in the DC transmission line, an alarm information can be output.

[0073] The alarm information can include, but is not limited to, the fault type and the fault repair measure, and can also include the fault location and the fault time and the like.

[0074] For example, in the case that there is a current measurement fault or an abnormal inter-station transmission in the DC transmission line, the terminal 102 can output alarm information including the fault type and the fault repair measure and the like to the worker.

[0075] In the embodiment of the present application, by introducing the current threshold and the voltage threshold, a basis is provided for judging the condition of the DC transmission line, so as to realize accurate monitoring of the abnormal condition of the DC transmission line.

[0076] On the basis of the above-mentioned embodiment, the embodiment of the present application explains and describes the above-mentioned embodiment S201 in detail. Specifically, the process of obtaining the rectifier station current and the inverter station current in the DC transmission line is involved in the embodiment of the present application, and specifically includes:

[0077] The rectifier station current and the inverter station current in the DC transmission line are collected through inter-station communication between the rectifier station and the inverter station in the DC transmission line.

[0078] It should be noted that, in the DC transmission project, in order to detect whether a ground fault occurs on the transmission line, a longitudinal differential protection is usually configured, that is, a DC line longitudinal differential protection is configured for the DC transmission line; wherein the longitudinal differential protection is to collect the line currents of the station (such as the rectifier station) and the opposite station (such as the inverter station) and calculate the differential current, and the differential current between the two ends of the line is basically 0 in normal operation; when a ground fault occurs, the longitudinal differential protection will generate a large differential current; and the longitudinal differential protection needs to collect the line current of the opposite station through inter-station communication, and the inter-station communication needs to follow a specific communication protocol, such as MODBUS and IEC 60870-5-104, to ensure reliable transmission and correct analysis of data.

[0079] For example, the rectifier station current collected by the current measurement device in the rectifier station and the inverter station current collected by the current measurement device in the inverter station can be obtained through inter-station communication between the rectifier station and the inverter station in the DC transmission line.

[0080] In the embodiment of the present application, by introducing inter-station communication, a way is provided for obtaining the rectifier station current and the inverter station current, and a foundation is laid for accurately determining the line current difference between the rectifier station and the inverter station.

[0081] On the basis of the above-mentioned embodiment, the embodiment provides an optional example of a method for monitoring the abnormality of the DC transmission line. As shown in Figure 7 the specific implementation process is as follows:

[0082] S701, acquire the rectifier station current, the inverter station current and the DC line voltage in the DC transmission line.

[0083] Optionally, the rectifier station current and the inverter station current in the DC transmission line can be acquired through the inter-station communication between the rectifier station and the inverter station in the DC transmission line.

[0084] S702, determine the line current difference between the rectifier station and the inverter station in the DC transmission line according to the rectifier station current and the inverter station current.

[0085] S703, if the line current difference is greater than the current threshold value and the DC line voltage is less than the voltage threshold value, determine that the DC transmission line has a short-circuit fault.

[0086] Optionally, the current threshold value and the voltage threshold value can be determined according to the transmission performance between the rectifier station and the inverter station in the DC transmission line.

[0087] It should be noted that, in the case that the DC transmission line has a short-circuit fault, the target current and the DC line voltage in the DC transmission line can be reduced to zero, and after the target current and the DC line voltage in the DC transmission line are reduced to zero, the target current and the DC line voltage in the DC transmission line are restored to the state before the short-circuit fault; wherein the target current includes the rectifier station current and the inverter station current.

[0088] S704, if the line current difference is greater than the current threshold value and the DC line voltage is greater than or equal to the voltage threshold value, determine that the DC transmission line has a current measurement fault or an inter-station transmission abnormality.

[0089] It should be noted that, in the case that the DC transmission line has a current measurement fault or an inter-station transmission abnormality, an alarm information is output; wherein the alarm information includes the fault type and the fault repair measure.

[0090] The specific process of S701-S704 can refer to the description of the above method embodiments, and the implementation principle and technical effects are similar, which will not be repeated here.

[0091] It should be understood that although the steps in the flowcharts involved in the embodiments described above are shown in sequence according to the arrows, the steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, the execution of the steps is not strictly limited in sequence, and the steps can be executed in other orders. Moreover, at least some of the steps in the flowcharts involved in the embodiments described above can include multiple steps or multiple stages, which are not necessarily executed at the same time but can be executed at different times, and the execution of the steps or stages is not necessarily sequential but can be executed alternately or in rotation with at least some of the other steps or the steps or stages in the other steps.

[0092] Based on the same inventive concept, the embodiments of the present application also provide an abnormality monitoring device for a DC power transmission line, which is used to implement the abnormality monitoring method of the DC power transmission line described above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, and therefore the specific limitations in one or more embodiments of the abnormality monitoring device for a DC power transmission line provided below can refer to the limitations of the abnormality monitoring method of the DC power transmission line described above, which will not be described again here.

[0093] In an exemplary embodiment, as shown in Figure 8 there is provided an abnormality monitoring device 1 for a DC power transmission line, comprising: an acquisition module 10, a difference determination module 20 and an abnormality determination module 30, wherein:

[0094] The acquisition module 10 is configured to acquire a rectifier station current, an inverter station current and a DC line voltage in the DC power transmission line.

[0095] The difference determination module 20 is configured to determine a line current difference between the rectifier station and the inverter station in the DC power transmission line according to the rectifier station current and the inverter station current.

[0096] The abnormality determination module 30 is configured to determine abnormality information of the DC power transmission line according to the DC line voltage and the line current difference.

[0097] In an embodiment, as shown in Figure 9 the abnormality determination module 30 specifically further comprises:

[0098] The short circuit determination unit 31 is configured to determine that a short circuit fault exists in the DC power transmission line if the line current difference is greater than a current threshold value and the DC line voltage is less than a voltage threshold value.

[0099] The abnormality determination unit 32 is configured to determine that a current measurement fault or an inter-station transmission abnormality exists in the DC power transmission line if the line current difference is greater than the current threshold value and the DC line voltage is greater than or equal to the voltage threshold value.

[0100] In one embodiment, the short-circuit determining unit 31 is specifically configured to:

[0101] reducing the target current and the DC line voltage in the DC transmission line to zero, and restoring the target current and the DC line voltage in the DC transmission line to a state before the short-circuit fault after the target current and the DC line voltage in the DC transmission line are reduced to zero; wherein the target current comprises the rectifier station current and the inverter station current.

[0102] In one embodiment, the anomaly determining unit 32 is specifically configured to:

[0103] outputting alarm information; wherein the alarm information comprises the fault type and the fault repair measure.

[0104] In one embodiment, the anomaly monitoring device 1 of the DC transmission line further comprises:

[0105] a communication module, configured to collect the rectifier station current and the inverter station current in the DC transmission line through inter-station communication between the rectifier station and the inverter station in the DC transmission line.

[0106] In one embodiment, the anomaly monitoring device 1 of the DC transmission line further comprises:

[0107] a threshold determining module, configured to determine the current threshold and the voltage threshold according to the transmission performance between the rectifier station and the inverter station in the DC transmission line.

[0108] The above various modules of the anomaly monitoring device of the DC transmission line can be realized by software, hardware and combinations thereof, in whole or in part. The above various modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to the above various modules.

[0109] In one exemplary embodiment, a computer device is provided, which can be a server, and the internal structure diagram thereof can be as shown in Figure 10As shown in the figure. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through the system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capability. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store line data. The input / output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used to communicate with the terminal outside through the network connection. The computer program is executed by the processor to realize an abnormal monitoring method of a direct current transmission line.

[0110] Those skilled in the art can understand that, Figure 10 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0111] In one exemplary embodiment, a computer device is provided, comprising a memory and a processor, the memory storing a computer program, and the processor executing the computer program to realize the following steps:

[0112] Obtaining the rectifier station current, the inverter station current and the direct current line voltage in the direct current transmission line;

[0113] According to the rectifier station current and the inverter station current, determining the line current difference between the rectifier station and the inverter station in the direct current transmission line;

[0114] According to the direct current line voltage and the line current difference, determining the abnormal information of the direct current transmission line.

[0115] In one embodiment, the processor executing the computer program further realizes the following steps:

[0116] If the line current difference is greater than the current threshold value, and the direct current line voltage is less than the voltage threshold value, it is determined that there is a short circuit fault in the direct current transmission line; if the line current difference is greater than the current threshold value, and the direct current line voltage is greater than or equal to the voltage threshold value, it is determined that there is a current measurement fault or an inter-station transmission anomaly in the direct current transmission line.

[0117] In one embodiment, the processor executing the computer program further realizes the following steps:

[0118] The target current in the DC transmission line and the DC line voltage are reduced to zero, and after the target current in the DC transmission line and the DC line voltage are reduced to zero, the target current in the DC transmission line and the DC line voltage are restored to the state before the short-circuit fault; wherein the target current includes the rectifier station current and the inverter station current.

[0119] In one embodiment, the processor, when executing the computer program, also implements the following steps:

[0120] outputting alarm information; wherein the alarm information includes the fault type and the fault repair measure.

[0121] In one embodiment, the processor, when executing the computer program, also implements the following steps:

[0122] The rectifier station current and the inverter station current in the DC transmission line are collected through inter-station communication between the rectifier station and the inverter station in the DC transmission line.

[0123] In one embodiment, the processor, when executing the computer program, also implements the following steps:

[0124] The current threshold and the voltage threshold are determined according to the transmission performance between the rectifier station and the inverter station in the DC transmission line.

[0125] In one embodiment, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program, and the computer program, when executed by a processor, implements the following steps:

[0126] The rectifier station current, the inverter station current and the DC line voltage in the DC transmission line are obtained;

[0127] The line current difference between the rectifier station and the inverter station in the DC transmission line is determined according to the rectifier station current and the inverter station current;

[0128] The abnormal information of the DC transmission line is determined according to the DC line voltage and the line current difference.

[0129] In one embodiment, the computer program, when executed by the processor, also implements the following steps:

[0130] If the line current difference is greater than the current threshold, and the DC line voltage is less than the voltage threshold, it is determined that the DC transmission line has a short-circuit fault; if the line current difference is greater than the current threshold, and the DC line voltage is greater than or equal to the voltage threshold, it is determined that the DC transmission line has a current measurement fault or an inter-station transmission abnormality.

[0131] In one embodiment, the computer program, when executed by the processor, also implements the following steps:

[0132] The target current in the DC transmission line and the DC line voltage are reduced to zero, and after the target current in the DC transmission line and the DC line voltage are reduced to zero, the target current in the DC transmission line and the DC line voltage are restored to the state before the short-circuit fault; wherein the target current includes the rectifier station current and the inverter station current.

[0133] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0134] outputting alarm information; wherein the alarm information includes the fault type and the fault repair measure.

[0135] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0136] The rectifier station current and the inverter station current in the DC transmission line are collected through inter-station communication between the rectifier station and the inverter station in the DC transmission line.

[0137] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0138] The current threshold and the voltage threshold are determined according to the transmission performance between the rectifier station and the inverter station in the DC transmission line.

[0139] In one embodiment, a computer program product is provided, comprising a computer program which, when executed by the processor, implements the following steps:

[0140] obtaining the rectifier station current, the inverter station current and the DC line voltage in the DC transmission line;

[0141] determining the line current difference between the rectifier station and the inverter station in the DC transmission line according to the rectifier station current and the inverter station current;

[0142] determining the abnormal information of the DC transmission line according to the DC line voltage and the line current difference.

[0143] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0144] If the line current difference is greater than the current threshold and the DC line voltage is less than the voltage threshold, it is determined that the DC transmission line has a short-circuit fault; if the line current difference is greater than the current threshold and the DC line voltage is greater than or equal to the voltage threshold, it is determined that the DC transmission line has a current measurement fault or an inter-station transmission abnormality.

[0145] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0146] The target current in the DC transmission line and the DC line voltage are reduced to zero, and after the target current in the DC transmission line and the DC line voltage are reduced to zero, the target current in the DC transmission line and the DC line voltage are restored to the state before the short-circuit fault; wherein the target current includes the rectifier station current and the inverter station current.

[0147] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0148] outputting alarm information; wherein the alarm information includes the fault type and the fault repair measure.

[0149] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0150] The rectifier station current and the inverter station current in the DC transmission line are collected through inter-station communication between the rectifier station and the inverter station in the DC transmission line.

[0151] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0152] The current threshold and the voltage threshold are determined according to the transmission performance between the rectifier station and the inverter station in the DC transmission line.

[0153] It should be noted that the information (including but not limited to rectifier station information, inverter station information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by all parties, and the collection, use and processing of related data need to comply with relevant regulations.

[0154] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, database or other medium used in the embodiments provided in the present 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 storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0155] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the present application.

[0156] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method of monitoring an abnormality of a DC power transmission line, characterized by, The method comprises: obtaining rectifier station current, inverter station current and DC line voltage in a DC transmission line; determining line current difference between the rectifier station and the inverter station in the DC transmission line according to the rectifier station current and the inverter station current; if the line current difference is greater than a current threshold value and the DC line voltage is less than a voltage threshold value, determining that a short circuit fault exists in the DC transmission line; if the line current difference is greater than the current threshold value and the DC line voltage is greater than or equal to the voltage threshold value, determining that a current measurement fault or an inter-station transmission abnormality exists in the DC transmission line.

2. The method of claim 1, wherein, In the case that the short circuit fault exists in the DC transmission line, the method further comprises: reducing target current in the DC transmission line and the DC line voltage to zero, and restoring the target current in the DC transmission line and the DC line voltage to a state before the short circuit fault after the target current in the DC transmission line and the DC line voltage are reduced to zero; wherein the target current comprises the rectifier station current and the inverter station current.

3. The method of claim 1, wherein, In the case that the current measurement fault or the inter-station transmission abnormality exists in the DC transmission line, the method further comprises: outputting alarm information; wherein the alarm information comprises fault type and fault repair measures.

4. The method according to any one of claims 1 to 3, characterized in that, Obtaining rectifier station current and inverter station current in a DC transmission line comprises: collecting the rectifier station current and the inverter station current in the DC transmission line through inter-station communication between the rectifier station and the inverter station in the DC transmission line.

5. The method of claim 1, wherein, The method further comprises: determining the current threshold value and the voltage threshold value according to transmission performance between the rectifier station and the inverter station in the DC transmission line.

6. An abnormality monitoring device for a DC power transmission line, characterized by comprising: The device comprises: an obtaining module configured to obtain rectifier station current, inverter station current and DC line voltage in a DC transmission line; a difference determining module configured to determine line current difference between the rectifier station and the inverter station in the DC transmission line according to the rectifier station current and the inverter station current; an abnormality determining module configured to determine that a short circuit fault exists in the DC transmission line if the line current difference is greater than a current threshold value and the DC line voltage is less than a voltage threshold value, and determine that a current measurement fault or an inter-station transmission abnormality exists in the DC transmission line if the line current difference is greater than the current threshold value and the DC line voltage is greater than or equal to the voltage threshold value. 7.A computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the computer device is configured to perform the method according to any one of claims 1-6 when the computer program is executed by the processor. The processor implements the steps of the method of any one of claims 1 to 5 when executing the computer program.

8. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by the processor, implements the steps of the method of any one of claims 1 to 5.

9. A computer program product comprising a computer program, characterized in that, The computer program, when executed by the processor, implements the steps of the method of any one of claims 1 to 5.

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