Mobile section parameter measurement method and apparatus for power distribution line, and device and medium

Abstract

A mobile section parameter measurement method for a power distribution line. The method comprises: respectively connecting a first mobile terminal (20) and a second mobile terminal (21) to endpoints of a line section to be measured (step S1); determining whether communication between the first mobile terminal (20) and the second mobile terminal (21) is normal, determining whether time synchronization between the first mobile terminal (20) and the second mobile terminal (21) is normal, and determining whether said line section between the first mobile terminal (20) and the second mobile terminal (21) is within the same section of the same phase line (step S2); if communication is normal, time synchronization is normal and said line section between the first mobile terminal (20) and the second mobile terminal (21) is within the same section of the same phase line, instructing the first mobile terminal (20) and the second mobile terminal (21) to perform voltage vector measurement and current vector measurement at any absolute time (step S3); if the absolute time has not been reached, waiting for the absolute time to perform measurement (step S4) and sending results to a host (22) (step S5); and on the basis of the results, the host (22) determining parameters of a line to be measured (step S6). In the method, a voltage vector and a current vector of each phase are measured at endpoints of two sides of a line section to be measured, and line impedance is thus accurately calculated, thereby providing accurate line parameters and topological information for protection constant value setting and power flow calculation of a power grid, supporting applications such as power grid planning, dispatching, operational control and source-grid-load-storage interaction, and assisting with new power system construction.

Description

Distribution line mobile section parameter measurement method, device, equipment and medium Technical Field

[0001] The present invention relates to the technical field of power distribution networks, and in particular to a method, device, equipment and medium for measuring parameters of a mobile section of a power distribution line. Background Art

[0002] To serve the national energy transformation and "dual carbon" goals, a large number of distributed new energy and diversified loads are connected to the power grid, requiring the power grid to achieve multi-directional coordination and flexible interaction. Traditional power grids have shown problems of insufficient transparency and digitalization, especially the distribution network structure is complex and the equipment is numerous. There is an urgent need for transparency of power grid topology and electrical and physical parameters to truly realize the digital twin power grid.

[0003] Current technical means usually use the method of measuring line impedance during power outages, which affects power supply reliability and also places a large workload on the distribution network. Current technical means often use estimation to obtain the line impedance of a section of line, which has large errors. Currently, there is no effective method to accurately obtain the line impedance of a section of line online.

[0004] Summary of the Invention

[0005] Based on this, it is necessary to propose a method, device, equipment and medium for measuring the mobile section parameters of distribution lines to address the above problems, especially an online measurement method, device, equipment and storage medium for mobile section parameters that ignores ground impedance.

[0006] To achieve the above objectives, the present application provides, in a first aspect, a method for measuring parameters of a mobile section of a distribution line, which is applied to a mobile section parameter measuring device for a distribution line, the device comprising a first mobile terminal, a second mobile terminal, and a host, the method comprising:

[0007] connecting the first mobile terminal and the second mobile terminal to end points of the line section to be measured respectively;

[0008] The host determines whether communication between the first mobile terminal and the second mobile terminal is normal, determines whether timing between the first mobile terminal and the second mobile terminal is normal, and determines whether a line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line, where the same section refers to the same main line or the same branch line;

[0009] If the communication and timing are normal and the line section to be measured between the first mobile terminal and the second mobile terminal is within the same phase line section, the host issues a measurement instruction, wherein the measurement instruction instructs the first mobile terminal and the second mobile terminal to perform voltage vector and current vector measurement at any absolute time;

[0010] After receiving the measurement instruction, the first mobile terminal and the second mobile terminal wait and measure the line voltage vector and the line current vector at the absolute time if the absolute time has not arrived;

[0011] After the measurement is completed, the first mobile terminal and the second mobile terminal send the voltage vector and current vector data of the two endpoints to the host;

[0012] The host determines the parameters of the line to be measured according to the voltage vector and current vector data of the two endpoints.

[0013] In some embodiments, determining whether the line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line specifically includes:

[0014] determining a current vector magnitude and a phase deviation between the first mobile terminal and the second mobile terminal;

[0015] If both the current vector amplitude and the phase deviation of the first mobile terminal and the second mobile terminal are smaller than a first threshold, it is determined that the line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line:

[0016] If the current vector amplitude and phase deviation between the first mobile terminal and the second mobile terminal is greater than or equal to a first threshold, it is determined that the line section to be measured between the first mobile terminal and the second mobile terminal is not in the same section of the same phase line.

[0017] In some embodiments, the method further comprises:

[0018] If the absolute time has been reached, a request to change the absolute time is sent to the host.

[0019] In some embodiments, the method further comprises:

[0020] After receiving the absolute time change request, the host re-determines whether communication between the first mobile terminal and the second mobile terminal is normal, whether timing between the first mobile terminal and the second mobile terminal is normal, and whether the line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line;

[0021] If the communication and timing are normal, and the line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line, the host issues a measurement instruction again, and the measurement instruction is to instruct the first mobile terminal and the second mobile terminal to perform voltage vector and current vector measurement at the changed absolute time, and the changed absolute time is later than the absolute time before the change.

[0022] In some embodiments, the host determines the parameters of the line to be measured based on the voltage vector and current vector data of the two endpoints, including:

[0023] according to or Determine the parameters of the line to be measured, the is the voltage vector of the endpoint where the first mobile terminal 20 is located, is the voltage vector of the endpoint where the second mobile terminal 21 is located, is the current vector of the endpoint where the first mobile terminal 20 is located, is the current vector at the endpoint where the second mobile terminal 21 is located, and Z is the impedance of the line to be measured.

[0024] To achieve the above-mentioned objectives, the second aspect of the present application provides a mobile section parameter measurement device for a distribution line, the device comprising:

[0025] A first mobile terminal, a second mobile terminal, and a host;

[0026] The first mobile terminal and the second mobile terminal are respectively arranged at the end points of the line section to be measured, and are used to obtain voltage vector and current vector data according to the received host instructions and send them to the host;

[0027] The host is connected to the first mobile terminal and the second mobile terminal respectively, and is used to determine the parameters of the line to be measured based on the acquired voltage and current data, and is also used to determine whether the communication between the first mobile terminal and the second mobile terminal is normal, whether the timing of the first mobile terminal and the second mobile terminal is normal, and whether the line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line.

[0028] In some embodiments, the first mobile terminal and the second mobile terminal each include a voltage sensor, a current sensor, a timing module, a collection module, a terminal remote communication module, and a power module;

[0029] The power supply module is respectively connected to the voltage sensor, current sensor, timing module, acquisition module, and terminal remote communication module to provide working power to them;

[0030] The timing module is connected to the acquisition module, and is used to determine the current absolute time according to the received satellite signal, and send the current absolute time to the acquisition module;

[0031] The terminal remote communication module is connected to the acquisition module and the host, and is used to receive host instructions sent by the host and send them to the acquisition module, and send voltage vector and current vector data obtained from the acquisition module to the host;

[0032] The acquisition module is connected to the voltage sensor, current sensor, timing module, and terminal remote communication module respectively, and is used to collect voltage vector and current vector data through the voltage sensor and current sensor according to the current absolute time sent by the timing module and the host instruction sent by the terminal remote communication module, and send the collected voltage vector and current vector data to the host through the terminal remote communication module;

[0033] The voltage sensor is connected to the acquisition module and is used to obtain voltage vector data;

[0034] The current sensor is connected to the acquisition module and is used to obtain current vector data.

[0035] In some embodiments, the host includes a host remote communication module, a control module, and a human-computer interaction module;

[0036] The host remote communication module is connected to the human-computer interaction module and the control module, and is used to communicate with the first mobile terminal and the second mobile terminal;

[0037] The human-computer interaction module is used to obtain user input instructions and display parameters of the line to be measured;

[0038] The control module is connected to the human-computer interaction module and is used to generate a measurement instruction according to the user's input instruction; and is also used to determine the parameters of the line to be measured according to the voltage vector and current vector data obtained by the first mobile terminal and the second mobile terminal.

[0039] In some embodiments, the host remote communication module is further configured to obtain the operating status, current absolute time, current vector amplitude, and phase deviation of the first mobile terminal and the second mobile terminal;

[0040] The control module is further configured to determine whether communication is normal based on the operating status of the first mobile terminal and the second mobile terminal, determine whether timing is normal based on the current absolute time, and determine whether a line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line based on the current vector amplitude and phase deviation between the first mobile terminal and the second mobile terminal.

[0041] To achieve the above-mentioned objective, the third aspect of the present application provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the following steps:

[0042] connecting the first mobile terminal and the second mobile terminal to end points of the line section to be measured respectively;

[0043] The host determines whether communication between the first mobile terminal and the second mobile terminal is normal, determines whether timing between the first mobile terminal and the second mobile terminal is normal, and determines whether a line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line, where the same section refers to the same main line or the same branch line;

[0044] If the communication and timing are normal and the line section to be measured between the first mobile terminal and the second mobile terminal is within the same phase line section, the host issues a measurement instruction, wherein the measurement instruction instructs the first mobile terminal and the second mobile terminal to perform voltage vector and current vector measurement at any absolute time;

[0045] After receiving the measurement instruction, the first mobile terminal and the second mobile terminal wait and measure the line voltage vector and the line current vector at the absolute time if the absolute time has not arrived;

[0046] After the measurement is completed, the first mobile terminal and the second mobile terminal send the voltage vector and current vector data of the two endpoints to the host;

[0047] The host determines the parameters of the line to be measured according to the voltage vector and current vector data of the two endpoints.

[0048] To achieve the above-mentioned object, the fourth aspect of the present application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor performs the following steps:

[0049] connecting the first mobile terminal and the second mobile terminal to end points of the line section to be measured respectively;

[0050] The host determines whether communication between the first mobile terminal and the second mobile terminal is normal, determines whether timing between the first mobile terminal and the second mobile terminal is normal, and determines whether a line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line, where the same section refers to the same main line or the same branch line;

[0051] If the communication and timing are normal and the line section to be measured between the first mobile terminal and the second mobile terminal is within the same phase line section, the host issues a measurement instruction, wherein the measurement instruction instructs the first mobile terminal and the second mobile terminal to perform voltage vector and current vector measurement at any absolute time;

[0052] After receiving the measurement instruction, the first mobile terminal and the second mobile terminal wait and measure the line voltage vector and the line current vector at the absolute time if the absolute time has not arrived;

[0053] After the measurement is completed, the first mobile terminal and the second mobile terminal send the voltage vector and current vector data of the two endpoints to the host;

[0054] The host determines the parameters of the line to be measured according to the voltage vector and current vector data of the two endpoints.

[0055] The embodiments of the present invention have the following beneficial effects:

[0056] The distribution network mobile interval parameter measurement device proposed in the present invention utilizes a movable first mobile terminal, a second mobile terminal, and a host computer, and through satellite timing, measures the voltage vector and current vector of each phase on both sides of the line section to be measured at the same absolute time, thereby accurately calculating the line impedance, thereby improving the accuracy and convenience of obtaining the impedance of the power grid line to be measured, and providing accurate line parameters and topology information for power grid protection constant value setting and power flow calculation, supporting applications such as power grid planning, scheduling, operation control, and source-grid-load-storage interaction, and facilitating the construction of new power systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0058] in:

[0059] FIG1 is a schematic flow chart of a method for measuring parameters of a mobile section of a distribution line according to one embodiment;

[0060] FIG2 is a structural diagram of a mobile section parameter measuring device for a power distribution line according to one embodiment;

[0061] FIG3 is a structural diagram of a first mobile terminal in a mobile section parameter measurement device for a power distribution line according to an embodiment;

[0062] FIG4 is a structural diagram of a main unit in a mobile section parameter measuring device for a power distribution line according to one embodiment;

[0063] FIG5 is a schematic diagram of the structure of a computer device in one embodiment;

[0064] FIG6 is a schematic diagram of the structure of a computer-readable storage medium in one embodiment. DETAILED DESCRIPTION

[0065] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0066] In an embodiment of the present application, a method for measuring parameters of a mobile section of a distribution line is provided. Please refer to Figure 1. Figure 1 is a flow chart of measuring parameters of a mobile section of a distribution line in one embodiment. The method for measuring parameters of a mobile section of a distribution line includes steps S1 to S6.

[0067] Step S1, connecting the first mobile terminal and the second mobile terminal to endpoints of a line segment to be measured respectively;

[0068] Specifically, the first mobile terminal 20 and the second mobile terminal 21 are respectively connected to two end points of the line section to be measured, and the host 22 is connected to the first mobile terminal 20 and the second mobile terminal 21 .

[0069] Step S2, the host 22 determines whether the communication between the first mobile terminal 20 and the second mobile terminal 21 is normal, whether the timing between the first mobile terminal 20 and the second mobile terminal 21 is normal, and whether the line section to be measured between the first mobile terminal 20 and the second mobile terminal 21 is within the same section of the same phase line, where the same section refers to the same main line or the same branch line;

[0070] In some embodiments, determining whether the line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line specifically includes:

[0071] determining a current vector magnitude and a phase deviation between the first mobile terminal and the second mobile terminal;

[0072] If both the current vector amplitude and the phase deviation of the first mobile terminal and the second mobile terminal are smaller than a first threshold, it is determined that the line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line:

[0073] If the current vector amplitude and phase deviation between the first mobile terminal and the second mobile terminal is greater than or equal to a first threshold, it is determined that the line section to be measured between the first mobile terminal and the second mobile terminal is not in the same section of the same phase line.

[0074] Specifically, ideally, the current vector amplitude and phase deviation between the first mobile terminal 20 and the second mobile terminal 21 should be zero. Taking into account the measurement error of the device, the first threshold in this application is 0.5% of the measurement error of the device to ensure that the line section to be measured between the first mobile terminal 20 and the second mobile terminal 21 is in the same section of the same phase line, because the voltage vector and the current vector need to be detected phase by phase, and need to be the same main line or the same branch line of the same phase. If the line section to be measured between the first mobile terminal 20 and the second mobile terminal 21 is not in the same section of the same phase line, it is necessary to check the connection endpoints of the first mobile terminal 20 and the second mobile terminal 21.

[0075] In some embodiments, the host 22 is operated to send a test instruction to query whether the voltage and current data obtained by the first mobile terminal 20 and the second mobile terminal 21 are received within a preset time. If they cannot be received, or only the voltage and current data of one mobile terminal are received, it is considered that the communication is abnormal. At this time, further detection and attempt to reconnect the communication are required. If the communication is normal, further detection is performed to determine whether the timing is normal and accurate. If the timing is normal and accurate, it is determined whether the line section to be measured between the first mobile terminal 20 and the second mobile terminal 21 is within the same section of the same phase line. If it is within the same section of the same phase line, go to step S3.

[0076] Step S3: If the communication and timing are normal and the line section to be measured between the first mobile terminal and the second mobile terminal is within the same phase line section, the host issues a measurement instruction, wherein the measurement instruction instructs the first mobile terminal and the second mobile terminal to perform voltage vector and current vector measurement at any absolute time.

[0077] Specifically, the measurement instruction, that is, the host instruction, includes requiring the first mobile terminal 20 and the second mobile terminal 21 to perform voltage and current measurements at a certain absolute time point. Generally speaking, the absolute time required to be measured is a delay of the current absolute time.

[0078] Step S4: After receiving the measurement instruction, if the absolute time has not arrived, the first mobile terminal and the second mobile terminal wait and measure the line voltage vector and the line current vector at the absolute time;

[0079] Specifically, the absolute time is acquired in real time by the timing module.

[0080] In some embodiments, the method further comprises:

[0081] If the absolute time has been reached, a request to change the absolute time is sent to the host 22.

[0082] In some embodiments, the method further comprises:

[0083] After receiving the absolute time change request, the host 22 re-determines whether the communication between the first mobile terminal 20 and the second mobile terminal 21 is normal, and determines whether the timing between the first mobile terminal 20 and the second mobile terminal 21 is normal;

[0084] If the communication and timing are normal, the host 22 issues a measurement instruction again, which instructs the first mobile terminal 20 and the second mobile terminal 21 to perform voltage vector and current vector measurements at the changed absolute time, which is later than the absolute time before the change.

[0085] Step S5: After the measurement is completed, the first mobile terminal and the second mobile terminal send the voltage vector and current vector data of the two endpoints to the host;

[0086] Step S6, the host determines the parameters of the line to be measured based on the voltage vector and current vector data of the two endpoints;

[0087] In some embodiments, the host determines the parameters of the line to be measured based on the voltage vector and current vector data of the two endpoints, including:

[0088] according to or Determine the parameters of the line to be measured, the is the voltage vector of the endpoint where the first mobile terminal 20 is located, is the voltage vector of the endpoint where the second mobile terminal 21 is located, is the current vector of the endpoint where the first mobile terminal 20 is located, is the current vector at the endpoint where the second mobile terminal 21 is located, and Z is the impedance of the line to be measured.

[0089] Specifically, the current vector of the endpoint where the second mobile terminal 21 is located is the same as the current vector of the endpoint where the first mobile terminal 20 is located in an ideal situation, so it can be based on or Determine the parameters of the line to be measured, where The differences are consistent.

[0090] Using the technical solution of this embodiment, the host determines whether the first mobile terminal and the second mobile terminal are communicating normally, whether the timing is normal, and whether the line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line. If the communication and timing are normal, and the line section to be measured between the first mobile terminal and the second mobile terminal is within the same phase line section, the host issues a measurement instruction, wherein the measurement instruction instructs the first mobile terminal and the second mobile terminal to perform voltage and current measurements within an arbitrary absolute time. After receiving the measurement instruction, if the absolute time has not arrived, the first mobile terminal and the second mobile terminal wait and measure the line voltage and current at the absolute time. After the measurement is completed, the first mobile terminal and the second mobile terminal send the voltage and current data of the two endpoints to the host. The host determines the parameters of the line to be measured based on the voltage and current of the two endpoints, thereby improving the accuracy and convenience of obtaining the impedance of the power grid line to be measured, providing accurate line parameters and topology information for power grid protection setting and power flow calculation, supporting applications such as power grid planning, scheduling, operation control, and source-grid-load-storage interaction, and facilitating the construction of new power systems.

[0091] In an embodiment of the present application, a distribution line mobile section parameter measuring device is provided. Please refer to Figure 2, which is a structural diagram of the distribution line mobile section parameter measuring device in one embodiment. The distribution line mobile section parameter measuring device includes: a first mobile terminal 20, a second mobile terminal 21, and a host 22.

[0092] The first mobile terminal and the second mobile terminal are respectively arranged at the end points of the line section to be measured, and are used to obtain voltage vector and current vector data according to the received host instructions and send them to the host;

[0093] The host is connected to the first mobile terminal and the second mobile terminal respectively, and is used to determine the parameters of the line to be measured based on the acquired voltage and current data, and is also used to determine whether the communication between the first mobile terminal and the second mobile terminal is normal, whether the timing of the first mobile terminal and the second mobile terminal is normal, and whether the line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line.

[0094] Specifically, the first mobile terminal 20 and the second mobile terminal 21 are the same, and are respectively connected to the two end points of the line section to be measured when working. The first mobile terminal 20, the second mobile terminal 21 and the host 22 are in the same time zone to ensure the consistency of time during time synchronization. The remote communication method between the host 22 and the first mobile terminal 20 and the first mobile terminal 21 can adopt any feasible method, including but not limited to wired communication and wireless communication.

[0095] In some embodiments, the first mobile terminal 20 and the second mobile terminal 21 each include a power module 201 , a timing module 202 , a terminal remote communication module 203 , a collection module 204 , a voltage sensor 205 , and a current sensor 206 ;

[0096] The power supply module 201 is respectively connected to the voltage sensor 205, the current sensor 206, the timing module 202, the acquisition module 204, and the terminal remote communication module 203 to provide working power to them;

[0097] The timing module 202 is connected to the acquisition module 204 and is used to determine the current absolute time based on the received satellite signal and send the current absolute time to the acquisition module 204;

[0098] The terminal remote communication module 203 is connected to the acquisition module 204 and the host 22, and is used to receive host instructions sent by the host 22 and send them to the acquisition module 204, and send voltage vector and current vector data obtained from the acquisition module 204 to the host 22;

[0099] The acquisition module 204 is connected to the voltage sensor 205, the current sensor 206, the timing module 202, and the terminal remote communication module 203 respectively. The acquisition module 204 is used to collect voltage vector and current vector data through the voltage sensor 205 and the current sensor 206 according to the current absolute time sent by the timing module 202 and the host instruction sent by the terminal remote communication module 203, and send the collected voltage vector and current vector data to the host 22 through the terminal remote communication module 203;

[0100] The voltage sensor 205 is connected to the acquisition module 204 and is used to obtain voltage vector data;

[0101] The current sensor 206 is connected to the acquisition module 204 and is used to obtain current vector data.

[0102] Specifically, the first mobile terminal 20 and the second mobile terminal 21 have the same structure. For details, please refer to the structural diagram of the first mobile terminal in the mobile section parameter measurement device of the distribution line in one embodiment of Figure 3. The power supply module 201, the timing module 202, the terminal remote communication module 203, the acquisition module 204, the voltage sensor 205, and the current sensor 206 can be directly connected or indirectly connected.

[0103] The timing module 202 is used to receive satellite signals to determine the current absolute time. The current absolute time refers to the UTC time in any time zone. The host and the two mobile terminals use the same UTC time zone. The satellite signal can be any satellite signal in the world that can be used for accurate timing, including but not limited to GPS signals and Beidou satellite signals, and the timing error of the timing module 202 is less than 1ms. In this application, the timing error of the timing module 202 is 1us~1ms.

[0104] The terminal remote communication module 203 is responsible for realizing the communication between the modules inside the mobile terminal and the communication between the mobile terminal and the host.

[0105] The acquisition module 204 digitally acquires the voltage and current of the first mobile terminal 20 and the second mobile terminal 21 at the required absolute time based on the absolute time sent by the timing module and the absolute time required in the host instruction.

[0106] In some embodiments, the host 22 includes a host remote communication module 221 , a control module 222 , and a human-computer interaction module 223 ;

[0107] The host remote communication module 221 is connected to the human-computer interaction module 223 and the control module 222, and is used to communicate with the first mobile terminal 20 and the second mobile terminal 21;

[0108] The human-computer interaction module 223 is used to obtain user input instructions and display parameters of the line to be measured;

[0109] The control module 222 is connected to the human-computer interaction module 223 and is used to generate a measurement instruction according to the user's input instruction; it is also used to determine the parameters of the line to be measured based on the voltage vector and current vector data obtained by the first mobile terminal 20 and the second mobile terminal 21.

[0110] Specifically, the host 22 can refer to the structural diagram of the host in the mobile section parameter measuring device of the distribution line in one embodiment of Figure 4. The user inputs the measurement command through the human-computer interaction module 223 in the host 22, and sends the measurement command to the control module 222. The control module 222 generates a measurement instruction according to the user's input instruction, and sends it to the terminal remote communication module 203 of the first mobile terminal 20 and the second mobile terminal 21 respectively. Here, the measurement instruction is the host instruction sent by the host 22. The host remote communication module 221 is connected to the terminal remote communication module 203 of the first mobile terminal 20 and the second mobile terminal 21 respectively to realize the communication between the host 22 and the first mobile terminal 20 and the second mobile terminal 21.

[0111] In some embodiments, the host remote communication module 221 is further configured to obtain the working status, current absolute time, current vector amplitude, and phase deviation of the first mobile terminal 20 and the second mobile terminal 21;

[0112] The control module 222 is further configured to determine whether the communication is normal according to the working status of the first mobile terminal 20 and the second mobile terminal 21, determine whether the timing is normal according to the current absolute time, and determine whether the line section to be measured between the first mobile terminal 20 and the second mobile terminal 21 is within the same section of the same phase line according to the current vector amplitude and phase deviation between the first mobile terminal 20 and the second mobile terminal 21.

[0113] Specifically, the host can determine whether the communication is normal by sending a test command to detect the working status of the first mobile terminal 20 and the second mobile terminal 21, and determine whether the timing is normal by obtaining the current absolute time of the first mobile terminal 20 and the second mobile terminal 21 and comparing it with the current absolute time of the host.

[0114] The distribution network mobile interval parameter measurement device proposed in the present invention utilizes a movable first mobile terminal, a second mobile terminal, and a host computer, and through satellite timing, measures the voltage vector and current vector of each phase on both sides of the line section to be measured at the same absolute time, thereby accurately calculating the line impedance, thereby improving the accuracy and convenience of obtaining the impedance of the power grid line to be measured, and providing accurate line parameters and topology information for power grid protection constant value setting and power flow calculation, supporting applications such as power grid planning, scheduling, operation control, and source-grid-load-storage interaction, and facilitating the construction of new power systems.

[0115] In an embodiment of the present application, a computer device is provided. Please refer to FIG5 , which is a schematic diagram of the structure of a computer device in one embodiment. The device includes a memory 301 and a processor 302. The memory 301 stores a computer program. When the computer program is executed by the processor 302, the processor 302 performs the following steps:

[0116] connecting the first mobile terminal and the second mobile terminal to end points of the line section to be measured respectively;

[0117] The host determines whether communication between the first mobile terminal and the second mobile terminal is normal, determines whether timing between the first mobile terminal and the second mobile terminal is normal, and determines whether a line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line, where the same section refers to the same main line or the same branch line;

[0118] If the communication and timing are normal and the line section to be measured between the first mobile terminal and the second mobile terminal is within the same phase line section, the host issues a measurement instruction, wherein the measurement instruction instructs the first mobile terminal and the second mobile terminal to perform voltage vector and current vector measurement at any absolute time;

[0119] After receiving the measurement instruction, the first mobile terminal and the second mobile terminal wait and measure the line voltage vector and the line current vector at the absolute time if the absolute time has not arrived;

[0120] After the measurement is completed, the first mobile terminal and the second mobile terminal send the voltage vector and current vector data of the two endpoints to the host;

[0121] The host determines the parameters of the line to be measured based on the voltage vector and current vector data of the two endpoints. The processor 302 may also be referred to as a CPU (Central Processing Unit). The processor 302 may be an integrated circuit chip with signal processing capabilities. The processor 302 may also be a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor may be a microprocessor, or the processor 301 may be any conventional processor.

[0122] In an embodiment of the present application, a computer-readable storage medium is provided. Please refer to FIG6 , which is a schematic diagram of the structure of a computer-readable storage medium in one embodiment. The storage medium stores a readable computer program 401. The computer program 401 may be stored in the storage medium in the form of a software product, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the following steps:

[0123] connecting the first mobile terminal and the second mobile terminal to end points of the line section to be measured respectively;

[0124] The host determines whether communication between the first mobile terminal and the second mobile terminal is normal, determines whether timing between the first mobile terminal and the second mobile terminal is normal, and determines whether a line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line, where the same section refers to the same main line or the same branch line;

[0125] If the communication and timing are normal and the line section to be measured between the first mobile terminal and the second mobile terminal is within the same phase line section, the host issues a measurement instruction, wherein the measurement instruction instructs the first mobile terminal and the second mobile terminal to perform voltage vector and current vector measurement at any absolute time;

[0126] After receiving the measurement instruction, the first mobile terminal and the second mobile terminal wait and measure the line voltage vector and the line current vector at the absolute time if the absolute time has not arrived;

[0127] After the measurement is completed, the first mobile terminal and the second mobile terminal send the voltage vector and current vector data of the two endpoints to the host;

[0128] The host determines the parameters of the line to be measured according to the voltage vector and current vector data of the two endpoints.

[0129] The aforementioned storage media include: USB flash drives, mobile hard drives, magnetic disks or optical disks, ROM (Read-Only Memory), RAM (Random Access Memory), and other media that can store program codes, or terminal devices such as computers, service machines, mobile phones, and tablets.

[0130] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0131] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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.

[0132] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for measuring parameters of a mobile section of a power distribution line, applied to a mobile section parameter measuring device for a power distribution line, the device comprising a first mobile terminal, a second mobile terminal, and a host, characterized in that: The method comprises: connecting the first mobile terminal and the second mobile terminal to end points of the line section to be measured respectively; The host determines whether communication between the first mobile terminal and the second mobile terminal is normal, determines whether timing between the first mobile terminal and the second mobile terminal is normal, and determines whether a line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line, where the same section refers to the same main line or the same branch line; If the communication and timing are normal and the line section to be measured between the first mobile terminal and the second mobile terminal is within the same phase line section, the host issues a measurement instruction, wherein the measurement instruction instructs the first mobile terminal and the second mobile terminal to perform voltage vector and current vector measurement at any absolute time; After receiving the measurement instruction, the first mobile terminal and the second mobile terminal wait and measure the line voltage vector and the line current vector at the absolute time if the absolute time has not arrived; After the measurement is completed, the first mobile terminal and the second mobile terminal send the voltage vector and current vector data of the two endpoints to the host; The host determines the parameters of the line to be measured according to the voltage vector and current vector data of the two endpoints.

2. The method for measuring parameters of a mobile section of a power distribution line according to claim 1, characterized in that: The determining whether the line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line specifically includes: determining a current vector magnitude and a phase deviation between the first mobile terminal and the second mobile terminal; If the current vector magnitude and phase deviation between the first mobile terminal and the second mobile terminal are both small Based on a first threshold, determining that the line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line: If the current vector amplitude and phase deviation between the first mobile terminal and the second mobile terminal is greater than or equal to a first threshold, it is determined that the line section to be measured between the first mobile terminal and the second mobile terminal is not in the same section of the same phase line.

3. The method for measuring parameters of a mobile section of a power distribution line according to claim 2, characterized in that: The method further comprises: If the absolute time has been reached, a request to change the absolute time is sent to the host.

4. The method for measuring parameters of a mobile section of a power distribution line according to claim 3, characterized in that: The method further comprises: After receiving the absolute time change request, the host re-determines whether communication between the first mobile terminal and the second mobile terminal is normal, whether timing between the first mobile terminal and the second mobile terminal is normal, and whether the line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line; If the communication and timing are normal, and the line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line, the host issues a measurement instruction again, and the measurement instruction is to instruct the first mobile terminal and the second mobile terminal to perform voltage vector and current vector measurement at the changed absolute time, and the changed absolute time is later than the absolute time before the change.

5. The method for measuring parameters of a mobile section of a power distribution line according to claim 4, characterized in that: The host determines the parameters of the line to be measured according to the voltage vector and current vector data of the two endpoints, including: according to work Determine the parameters of the line to be measured, the is the voltage vector of the endpoint where the first mobile terminal 20 is located, is the voltage vector of the endpoint where the second mobile terminal 21 is located, is the current vector of the endpoint where the first mobile terminal 20 is located, For the second mobile terminal 21 The current vector at the endpoint, Z is the impedance of the line to be measured.

6. A mobile section parameter measuring device for a distribution line, characterized in that: comprising a first mobile terminal, a second mobile terminal, and a host; The first mobile terminal and the second mobile terminal are respectively arranged at the end points of the line section to be measured, and are used to obtain voltage vector and current vector data according to the received host instructions and send them to the host; The host is connected to the first mobile terminal and the second mobile terminal respectively, and is used to determine the parameters of the line to be measured based on the acquired voltage and current data, and is also used to determine whether the communication between the first mobile terminal and the second mobile terminal is normal, whether the timing of the first mobile terminal and the second mobile terminal is normal, and whether the line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line.

7. The mobile section parameter measuring device for distribution lines according to claim 6, characterized in that: The first mobile terminal and the second mobile terminal both include a voltage sensor, a current sensor, a timing module, a collection module, a terminal remote communication module, and a power module; The power supply module is respectively connected to the voltage sensor, current sensor, timing module, acquisition module, and terminal remote communication module to provide working power to them; The timing module is connected to the acquisition module, and is used to determine the current absolute time according to the received satellite signal, and send the current absolute time to the acquisition module; The terminal remote communication module is connected to the acquisition module and the host, and is used to receive host instructions sent by the host and send them to the acquisition module, and send voltage vector and current vector data obtained from the acquisition module to the host; The acquisition module is connected to the voltage sensor, current sensor, timing module, and terminal remote communication module respectively, and is used to collect voltage vector and current vector data through the voltage sensor and current sensor according to the current absolute time sent by the timing module and the host instruction sent by the terminal remote communication module, and send the collected voltage vector and current vector data to the host through the terminal remote communication module; The voltage sensor is connected to the acquisition module and is used to obtain voltage vector data; The current sensor is connected to the acquisition module and is used to obtain current vector data.

8. The mobile section parameter measuring device for distribution lines according to claim 7, characterized in that: The host includes a host remote communication module, a control module, and a human-computer interaction module; The host remote communication module is connected to the human-computer interaction module and the control module, and is used to communicate with the first mobile terminal and the second mobile terminal; The human-computer interaction module is used to obtain user input instructions and display parameters of the line to be measured; The control module is connected to the human-computer interaction module and is used to generate a measurement instruction according to the user's input instruction; It is also used to determine the parameters of the line to be measured based on the voltage vector and current vector data acquired by the first mobile terminal and the second mobile terminal.

9. The mobile section parameter measuring device for distribution lines according to claim 8, characterized in that: The host remote communication module is further configured to obtain the operating status, current absolute time, current vector amplitude, and phase deviation of the first mobile terminal and the second mobile terminal; The control module is further configured to determine whether communication is normal based on the operating status of the first mobile terminal and the second mobile terminal, determine whether timing is normal based on the current absolute time, and determine whether a line section to be measured between the first mobile terminal and the second mobile terminal is within the same section of the same phase line based on the current vector amplitude and phase deviation between the first mobile terminal and the second mobile terminal.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 5.

11. A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 5.

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