A method, device and equipment for testing performance of a line selection device and a readable storage medium

Abstract

The application provides a line selection device performance test method, device and equipment and a readable storage medium. The line selection device performance test method provided by the application detects the connection signals between each device in the to-be-tested line selection system, ensures that the small current grounding line selection device in the to-be-tested line selection system is in a connected state, further constructs a target test model corresponding to a target power system and sets parameters, analyzes the line selection performance of the to-be-tested line selection device according to the fault condition of the target test model. As can be seen, when the performance of the small current grounding line selection device in the to-be-tested line selection system corresponding to the power distribution network containing new energy access is tested, the application can analyze the line selection performance of the small current grounding line selection device in the to-be-tested line selection system by judging the line selection result of the small current grounding line selection device, thereby solving the problem that it is difficult to test the performance of the small current grounding line selection device corresponding to the power distribution network containing new energy access.

Description

Technical Field

[0001] This application relates to the field of power system testing technology, and in particular to a method, apparatus, equipment and readable storage medium for testing the performance of a line selection device. Background Technology

[0002] In practical applications, distribution networks generally adopt low-current grounding systems, which are typically neutral-point ungrounded systems or systems grounded via arc suppression coils. As distribution networks expand, single-phase grounding faults become increasingly frequent. Although regulations allow for continued operation for 1-2 hours under fault conditions, configuring low-current grounding fault location devices in distribution networks is crucial for ensuring the safe operation of the power system, from the perspective of preventing electric shock and reducing public safety risks.

[0003] Existing line selection device performance testing systems are typically based on traditional distribution network structures, generally testing the performance of low-current grounding line selection devices under traditional terminal or load access conditions. However, with the development of new energy technologies, such as wind power and photovoltaics, they will gradually replace traditional thermal power units as the main force in power supply. The large-scale integration of wind and photovoltaic power into the distribution network significantly alters its operating characteristics, making existing line selection device performance testing methods insufficient for verifying whether the performance of low-current grounding line selection devices in distribution networks with new energy integration meets requirements. Summary of the Invention

[0004] This application aims to at least solve one of the aforementioned technical defects. In view of this, this application provides a method, apparatus, equipment and readable storage medium for testing the performance of a line selection device, which is used to solve the technical defect in the prior art that it is difficult to test whether the performance of a low-current grounding line selection device corresponding to a distribution network with new energy access meets the requirements.

[0005] To achieve the above objectives, the following solution is proposed:

[0006] A method for testing the performance of a line selection device, comprising:

[0007] The connection signals between the devices in the line selection system under test are detected to ensure that the devices in the line selection system under test are in a connected state.

[0008] Construct a target test model corresponding to the target power system;

[0009] Based on the parameters of the target power system, set the model parameters of the target test model;

[0010] Set the fault parameters of the target test model;

[0011] Based on the fault conditions of the target test model, the fault location performance of the low-current grounding fault location device in the fault location system to be tested is analyzed.

[0012] Preferably, the construction of the target test model corresponding to the target power system includes:

[0013] If the target power system is a neutral point ungrounded system, then based on the neutral point ungrounded system, a first target test model corresponding to the neutral point ungrounded system is constructed;

[0014] If the target power system is a grounded system via an arc suppression coil, then a second target test model corresponding to the grounded system via an arc suppression coil is constructed based on the grounded system via an arc suppression coil.

[0015] Preferably, setting the fault parameters of the target test model includes:

[0016] If the target power system is the neutral point ungrounded system, then based on the fault type of each branch of the neutral point ungrounded system, the fault type of each branch corresponding to the first target test model corresponding to the neutral point ungrounded system is set;

[0017] For each branch fault type corresponding to the first target test model, different grounding resistance parameters are set to simulate the high-resistance grounding and low-resistance grounding conditions of the neutral point ungrounded system.

[0018] Preferably, setting the fault parameters of the target test model includes:

[0019] If the target power system is the arc-suppression coil grounding system, then based on the fault type of each branch of the arc-suppression coil grounding system, the fault type of each branch corresponding to the second target test model corresponding to the arc-suppression coil grounding system is set.

[0020] For each branch fault type corresponding to the second target test model, different grounding resistance parameters are set to simulate the high-resistance grounding and low-resistance grounding conditions of the arc suppression coil grounding system.

[0021] Preferably, the step of analyzing the fault condition of the target test model and the fault location performance of the low-current grounding fault location device in the fault location system under test includes:

[0022] If the target power system is the neutral point ungrounded system, obtain the fault signal of each branch of the first target test model to obtain the first target line selection result;

[0023] Based on the first target line selection result and the fault status of each branch corresponding to the first target test model, the line selection performance of the low current grounding line selection device in the line selection system to be tested in the neutral point ungrounded system is analyzed.

[0024] Preferably, the step of analyzing the fault condition of the target test model and the fault location performance of the low-current grounding fault location device in the fault location system under test includes:

[0025] If the target power system is the grounded system via the arc suppression coil, obtain the fault signal of each branch of the second target test model to obtain the second target line selection result;

[0026] Based on the second target line selection result and the fault status of each branch corresponding to the second target test model, the line selection performance of the low current grounding line selection device in the line selection system to be tested in the arc suppression coil grounding system is analyzed.

[0027] Preferably, detecting the connection signals between the devices in the line selection system under test to ensure that the devices in the line selection system under test are in a connected state includes:

[0028] Determine the normal connectivity signal range between each device in the line selection system to be tested;

[0029] Based on the normal connectivity signal range between each device in the line selection system under test, determine whether the signal between each device in the line selection system under test is within the corresponding normal connectivity signal range.

[0030] If the signals between the devices in the line selection system under test are within the corresponding normal connectivity signal range, then it is determined that the devices in the line selection system under test are in a connected state.

[0031] A line selection device performance testing device, comprising:

[0032] The status detection module is used to detect the connection signals between various devices in the line selection system under test, to ensure that each device in the line selection system under test is in a connected state.

[0033] The model building module is used to build a target test model corresponding to the target power system.

[0034] The parameter setting module is used to set the model parameters of the target test model based on the parameters of the target power system;

[0035] The fault parameter setting module is used to set the fault parameters of the target test model;

[0036] The performance analysis module is used to analyze the line selection performance of the low-current grounding line selection device in the line selection system under test based on the fault conditions of the target test model.

[0037] A line selection device performance testing device includes: one or more processors, and a memory;

[0038] The memory stores computer-readable instructions, which, when executed by the one or more processors, implement the steps of any of the line selection device performance testing methods described above.

[0039] A readable storage medium storing computer-readable instructions, which, when executed by one or more processors, cause the one or more processors to perform the steps of any of the line selection device performance testing methods described above.

[0040] As can be seen from the above technical solutions, the embodiments of this application can first detect the connection signals between various devices in the line selection system under test, thereby ensuring that each device in the line selection system under test is in a connected state. After confirming that each device in the line selection system under test is in a connected state, a target test model corresponding to the target power system can be constructed, which helps to set the model parameters of the target test model based on the parameters of the target power system. After setting the model parameters of the target test model, the fault parameters of the target test model can be further set. After setting the fault parameters of the target test model, it helps to analyze the line selection performance of the low-current grounding line selection device in the line selection system under test based on the fault conditions of the target test model, thereby determining whether the low-current grounding line selection device in the line selection system under test has accurate line selection performance. The method provided by the embodiments of this application can introduce new energy on the basis of traditional distribution networks when testing the performance of the low-current grounding line selection device in the line selection system under test corresponding to a distribution network with new energy access, and test whether the performance of the low-current grounding line selection device in the line selection system under test meets the requirements. This solves the problem that existing line selection device performance testing methods cannot test the performance of low-current grounding line selection devices corresponding to distribution networks with new energy access. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A flowchart illustrating a method for testing the performance of a line selection device, provided in an embodiment of this application;

[0043] Figure 2 This is a schematic diagram of the hardware structure connection of a route selection system that includes new energy access, as shown in an embodiment of this application;

[0044] Figure 3 This is a schematic diagram of a test model structure for a neutral point ungrounded system, as shown in an embodiment of this application.

[0045] Figure 4 This is a schematic diagram of a test model structure for a grounding system with an arc suppression coil, as shown in an embodiment of this application.

[0046] Figure 5 This is a schematic diagram of the structure of a line selection device performance testing device, as exemplified by an embodiment of this application.

[0047] Figure 6 This is a hardware structure block diagram of a line selection device performance testing equipment disclosed in an embodiment of this application. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] Given that most current line selection device performance testing schemes are difficult to test the line selection performance of line selection devices in distribution networks that include new energy sources, the applicant has researched a line selection device performance testing scheme. This line selection device performance testing method can determine whether the line selection device can select lines normally based on the line selection results in a simulated distribution network with new energy access, thereby solving the problem of difficulty in testing the line selection performance of line selection devices in distribution networks with new energy access.

[0050] The method provided in this application can be used in a power distribution network computing device environment or configuration. For example, a dedicated power distribution network computer.

[0051] This application provides a method for testing the performance of a line selection device. This method can be applied to various power distribution networks or power systems containing new energy sources. The executing entity can be a computer terminal or the processor or server of a smart terminal.

[0052] The following is combined Figure 1 This paper describes the process of the line selection device performance testing method provided in the embodiments of this application. Figure 1A flowchart of a line selection device performance testing method provided in this application embodiment is shown below. Figure 1 As shown, the process may include the following steps:

[0053] Step S100: Detect the connection signals between the devices in the line selection system to be tested to ensure that the devices in the line selection system to be tested are in a connected state.

[0054] Specifically, in practical applications, the line selection system can be used to test the line selection performance of the low-current grounding line selection device corresponding to the distribution network including new energy access.

[0055] The applicant in this case designed a line selection system that can be used to test the line selection performance of a low-current grounding line selection device in a distribution network including new energy access, namely the line selection system to be tested.

[0056] The following will combine Figure 2 This paper introduces the line selection system to be tested used in the embodiments of this application. Figure 2 This is a schematic diagram of the hardware structure connection of a route selection system that includes new energy access, as shown in an embodiment of this application.

[0057] like Figure 2 As shown, the line selection system to be tested provided in this application embodiment may include: a simulation workstation, a real-time simulator, a low-current grounding line selection device, a new energy controller, an interface board, a power amplifier, and a relay.

[0058] in,

[0059] The simulation workstation can be connected to the real-time simulator, which can be connected to the interface board. The interface board can be connected to the low-current grounding selection device and the new energy controller through the relay and power amplifier.

[0060] The simulation workstation is mainly used to build simulation test models and can set the parameters of the power grid simulation model.

[0061] The low-current grounding fault location device can be used to perform logical operations based on received analog and digital signals to further determine the faulty line, faulty phase, and fault type. At the same time, it can send control commands to the real-time simulator through the interface board to control the circuit breaker.

[0062] The new energy controller can be used to simulate the grid connection characteristics of a new energy system, and to simulate the operating characteristics when new energy is connected.

[0063] The interface board, the power amplifier, and the relay can be used for the transmission and amplification of digital and analog signals between the real-time simulator and the low-current grounding selection device, as well as between the real-time simulator and the new energy controller.

[0064] The performance of the low-current grounding fault location device in the test system can be determined by simulating a real distribution network in the fault location system under test and simulating new energy access through the new energy controller.

[0065] When it is necessary to test the performance of the low-current grounding fault location device in the fault location system corresponding to a distribution network with new energy access, other factors that may affect the performance of the low-current grounding fault location device in the fault location system under test can be eliminated first. This ensures that the low-current grounding fault location device in the fault location system under test is in normal working condition, and prevents the fault location result of the low-current grounding fault location device in the fault location system under test from being interfered with by other factors, so as to obtain the most accurate test result and cause inaccurate test results.

[0066] Since the line selection system under test can be composed of multiple devices as described above, to determine whether the low-current grounding line selection device in the line selection system under test is in a normal connected state, the connection signals between the various devices in the line selection system under test can be detected. If the connection signals between the various devices are all normal, it can be determined that the various devices in the line selection system under test are in a normal state and that the various devices in the line selection system under test are in a connected state. Therefore, it can be determined that the low-current grounding line selection device in the line selection system under test is in a connected state and can be used normally.

[0067] Step S110: Construct a target test model corresponding to the target power system.

[0068] Specifically, as described above, after determining that each device in the line selection system to be tested is in a normal connected state, a target test model for testing the low-current grounding line selection device in the line selection system to be tested can be further built in the simulation workstation corresponding to the line selection system to be tested.

[0069] Generally, in practical applications, in order to ensure the user's power safety, the low-current grounding fault location device is not directly connected to the actual power system before its performance is tested, in order to prevent accidents that could lead to power safety incidents.

[0070] Generally, the low-current grounding fault location device can be tested by creating a target test model that can simulate the power system. Only if the low-current grounding fault location device passes the test can it be safely used in a real power distribution network environment.

[0071] There are many different types of power systems in the distribution network, including but not limited to neutral point ungrounded systems and systems grounded through arc suppression coils.

[0072] Before testing the low-current grounding fault location device, the power system selected by the user can be used as the target power system. The target power system can be simulated by the simulation workstation corresponding to the fault location system to be tested. A new energy controller that can simulate the access of new energy sources can be introduced to simulate the access of new energy sources, thereby obtaining the target test model corresponding to the distribution network with new energy access.

[0073] The target test model may include an infinite power supply, a transformer, a busbar, multiple branches, a load, and a new energy controller.

[0074] After establishing the target test model in the line selection system to be tested, which can simulate the distribution network with new energy access, it is helpful to further connect the low-current grounding line selection device to the line selection system to be tested for performance testing. That is, to perform performance testing on the low-current grounding line selection device in the line selection system to be tested, to determine whether the low-current grounding line selection device in the line selection system to be tested can correctly select the corresponding branch route in the distribution network with new energy access, and whether the line selection performance meets the requirements. In this way, it can be determined whether the performance of the low-current grounding line selection device in the distribution network with new energy access meets the requirements.

[0075] Step S120: Set the model parameters of the target test model according to the parameters of the target power system.

[0076] Specifically, as described above, step S110 can construct the target test model corresponding to the target power system, which facilitates the testing of the low-current grounding fault location device in the fault location system to be tested.

[0077] However, before conducting the test, in order to make the target test model more closely resemble the target power system, the relevant parameters of the target test model can be set in the simulation workstation corresponding to the line selection system to be tested.

[0078] Since the target test model is constructed based on the power system selected by the user, and each power system has its corresponding characteristics, as well as its corresponding sub-devices and parameter requirements, the target test model constructed based on the target power system also needs to have its parameters set according to the characteristics of the target power system and the parameters of its corresponding sub-devices.

[0079] Step S130: Set the fault parameters of the target test model.

[0080] Specifically, as described above, step S120 allows setting the model parameters of the target test model based on the parameters of the target power system.

[0081] Furthermore, to test the line selection performance of the low-current grounding line selection device in the line selection system to be tested, the corresponding fault parameters can be set on the target test model through the simulation workstation corresponding to the line selection system to be tested.

[0082] The target test model can include multiple branches, and different fault parameters can be set for each branch. This can simulate different fault conditions of each branch of the target power system, which helps to determine whether the low-current grounding fault location device in the test system can find the most suitable branch as the fault location result among all branches based on the different fault conditions of each branch, and thus determine the fault location performance of the low-current grounding fault location device in the test system.

[0083] Step S140: Based on the fault condition of the target test model, analyze the line selection performance of the low-current grounding line selection device in the line selection system to be tested.

[0084] Specifically, as described above, in step S130, corresponding fault parameters can be set for each branch of the target test model to obtain different fault conditions. Furthermore, based on the fault conditions of each branch of the target test model, the fault selection performance of the low-current grounding fault selection device connected to the fault selection system under test can be analyzed.

[0085] After setting the fault parameters for each branch of the target test model, the fault of the target test model can be triggered by the simulation workstation corresponding to the line selection system under test, and the fault signal of each branch of the target test model can be obtained. The line selection result of the low-current grounding line selection device in the line selection system under test can be obtained. This helps to further analyze the line selection result of the low-current grounding line selection device in the line selection system under test, thereby obtaining the line selection performance of the low-current grounding line selection device in the line selection system under test.

[0086] As can be seen from the above-described technical solutions, the method provided in this application embodiment can determine whether the devices in the line selection system under test are in a connected state by detecting whether the connection signals between the devices in the line selection system under test are normal, which helps to eliminate the problem of inaccurate testing caused by equipment problems. After determining that the devices in the line selection system under test are in a connected state, a target test model corresponding to the target power system including the new energy controller can be further constructed, and model parameters and fault parameters can be set. This can help the low-current grounding line selection device in the line selection system under test to perform line selection operation according to the set model parameters and fault parameters, and further help to analyze the line selection performance of the low-current grounding line selection device in the line selection system under test based on the fault conditions of the target test model. This application embodiment can create a target detection model including the new energy controller, and by setting different fault parameters and obtaining the line selection results of the low-current grounding line selection device in the line selection system under test, the line selection performance of the low-current grounding line selection device in the line selection system under test can be analyzed, solving the problem of difficulty in testing whether the performance of the low-current grounding line selection device corresponding to the distribution network with new energy access meets the requirements.

[0087] In another embodiment of this application, the process of detecting the connection signals between the devices in the line selection system under test in step S100 to ensure that the devices in the line selection system under test are in a connected state is described. This process may include the following steps:

[0088] Step S201: Determine the normal connectivity signal range between each device in the line selection system to be tested.

[0089] Specifically, to test the low-current grounding fault location device in the fault location system to be tested, it is necessary to first ensure that all devices in the fault location system to be tested are in a normal connected state to prevent inaccurate test results due to damage to some devices inside the fault location system to be tested.

[0090] To determine whether the line selection system under test is in a normal connectivity state, it can be first determined whether each device inside the line selection system under test is in a normal connectivity state.

[0091] To determine whether the devices within the line selection system under test are in a normal connected state, it can be done by determining whether the connection signals between the devices within the line selection system under test are within the normal connection signal range.

[0092] To determine whether the connectivity signals between the devices within the line selection system under test are within the normal connectivity signal range, the normal connectivity signal range between the devices within the line selection system under test can be obtained first.

[0093] Step S202: Based on the normal connectivity signal range between each device in the line selection system to be tested, determine whether the signal between each device in the line selection system to be tested is within the corresponding normal connectivity signal range.

[0094] Specifically, as described above, in step S201, the normal connectivity signal range between the various devices within the line selection system to be tested can be obtained.

[0095] Furthermore, it can be determined whether the signals between the various devices within the line selection system under test are within the corresponding normal communication signal range to determine whether the various devices within the line selection system under test are normally connected.

[0096] The signal data between the devices within the line selection system under test can be obtained and compared with the normal connectivity signal range between the devices within the line selection system under test obtained in step S201 above, thereby determining whether the devices in the line selection system under test are normally connected.

[0097] Step S203: If the signals between the devices in the line selection system to be tested are within the corresponding normal connection signal range, then it is determined that the devices in the line selection system to be tested are in a connected state.

[0098] Specifically, as described above, the connection signals between the devices in the line selection system under test can be compared with the normal connection range between the devices in the line selection system under test, thereby determining the state of each device in the line selection system under test.

[0099] For example,

[0100] Assume that the line selection system to be tested consists of device A, device B, and device C connected in series;

[0101] Device A is connected to Device B, and Device B is connected to Device C;

[0102] The normal communication signal range between device A and device B is 4mA-20mA;

[0103] The normal communication signal range between device B and device C is 10mA-20mA.

[0104] If the connection signal between device A and device B is 1mA and the connection signal between device B and device C is 5mA, it indicates that the connection signal between device A and device B is not within the normal connection signal range, and the connection signal between device B and device C is not within the normal connection range. This further indicates that the devices in the line selection system under test are not normally connected.

[0105] If, after testing, the connection signal between device A and device B is 10mA, and the connection signal between device B and device C is 15mA, both falling within their corresponding normal connection signal ranges, it can be concluded that all devices within the line selection system under test are in normal connection, further indicating that all devices in the line selection system under test are in a connected state.

[0106] As can be seen from the technical solutions described above, the method provided in this application embodiment can first determine the normal connectivity signal range between each device in the line selection system under test. This helps to compare the normal connectivity signal range between each device in the line selection system under test with the signals between each device in the line selection system under test, thereby determining whether each device in the line selection system under test is in a normal connectivity state, and thus determining whether the line selection system under test is in a connectivity state, eliminating the influence of equipment damage on the test results. This application embodiment can determine whether the line selection system under test can be used normally, eliminating the problem of inaccurate test results caused by damage to the line selection system under test, and helps to test whether the performance of the low-current grounding line selection device corresponding to the distribution network with new energy access meets the requirements.

[0107] In another embodiment of this application, the process of constructing a target test model corresponding to the target power system in step S110 described above is introduced. This process may include the following steps:

[0108] Step S301: If the target power system is a neutral point ungrounded system, then construct a first target test model corresponding to the neutral point ungrounded system based on the neutral point ungrounded system.

[0109] Specifically, as described above, there are two common low-current grounding systems: a neutral-point ungrounded system and an arc-suppression coil grounding system. This application uses the neutral-point ungrounded system and the arc-suppression coil grounding system as examples to introduce the process of constructing a target test model.

[0110] The target test model can be built using a simulation workstation, and the model parameters can be further set, as shown in the reference. Figure 3 , Figure 3 This is a schematic diagram of a test model for a neutral point ungrounded system as shown in an embodiment of this application. The model may include an infinite power source, a transformer, a busbar, branches, loads, and a new energy control model. The infinite power source can be connected to a 10kV busbar through a 110kV / 10kV transformer. The busbar may have multiple branches, one or two of which are connected to new energy sources. The case of a single type of new energy source or multiple types of new energy sources can be studied.

[0111] If the target power system is a neutral-point ungrounded system, then based on the characteristics of the neutral-point ungrounded system and in conjunction with the aforementioned new energy controller, a first target test model corresponding to the neutral-point ungrounded system can be constructed to simulate the distribution network with new energy access under the neutral-point ungrounded system. By testing whether the line selection equipment under test can correctly select the line in the first target test model, it can be further determined whether the low-current grounding line selection device in the line selection system under test can correctly select the line in the neutral-point ungrounded system containing new energy access.

[0112] Step S302: If the target power system is a grounded system via an arc suppression coil, then based on the grounded system via an arc suppression coil, construct a second target test model corresponding to the grounded system via an arc suppression coil.

[0113] Specifically, as described above, it can be further determined whether the line selection equipment under test can correctly select the line in the neutral ungrounded system containing new energy access by testing whether the line selection equipment under test can correctly select the line in the first target test model.

[0114] refer to Figure 4 , Figure 4 This is a schematic diagram of a test model structure for a grounding system with an arc suppression coil, as shown in an embodiment of this application.

[0115] like Figure 4 As shown, similar to the construction of the first target test model corresponding to the neutral point ungrounded system, a second target test model corresponding to the arc suppression coil grounded system can be constructed first through a simulation workstation. This allows for further determination of whether the line selection device to be tested can correctly select the line in the second target test model, and further determination of whether the low-current grounding line selection device in the line selection system to be tested can correctly select the line in the arc suppression coil grounded system containing new energy access.

[0116] As can be seen from the above-described technical solutions, the method provided in this application can perform different processing according to different target power systems, constructing a target test model corresponding to the target power system. When the target power system is a neutral-point ungrounded system, the first target test model corresponding to the neutral-point ungrounded system is constructed to provide the low-current grounding line selection device in the line selection system under test for line selection device performance testing. When the target power system is a system grounded through an arc suppression coil, the second target test model corresponding to the system grounded through an arc suppression coil is constructed to provide the low-current grounding line selection device in the line selection system under test for line selection device performance testing. This application can construct corresponding target test models according to different power systems for testing the low-current grounding line selection device in the line selection system under test, which helps to obtain the test results of the line selection performance of the low-current grounding line selection device in the line selection system under test under different target test models.

[0117] In another embodiment of this application, the process of setting the fault parameters of the target test model in step S130 is described, which may include the following steps:

[0118] Step S401: If the target power system is the neutral point ungrounded system, then based on the fault type of each branch of the neutral point ungrounded system, set the fault type of each branch corresponding to the first target test model corresponding to the neutral point ungrounded system.

[0119] Specifically, as can be seen from the above introduction, different power systems have different equipment and parameters, so it is necessary to set them according to the specific situation of the target power system selected.

[0120] If the target power system is the neutral point ungrounded system, then the fault types of each branch corresponding to the first target test model corresponding to the neutral point ungrounded system can be set according to the fault types of each branch of the neutral point ungrounded system. The fault settings can be made by applying a single-phase ground fault to each branch in the first target test model respectively.

[0121] Step S402: For each branch corresponding to the first target test model, set different grounding resistance parameters to simulate the high-resistance grounding and low-resistance grounding conditions of the neutral point ungrounded system.

[0122] Specifically, as described above, step S401 can be used to set a corresponding fault for each branch of the first target test model. Furthermore, different parameters can be set to simulate different grounding conditions of the neutral point ungrounded system.

[0123] By setting different grounding resistances for each branch corresponding to the first target test model, the high-resistance grounding and low-resistance grounding situations of the neutral point ungrounded system in reality can be simulated.

[0124] As can be seen from the above-described technical solutions, the method provided in this application embodiment can set fault parameters for the neutral point ungrounded system. If the target power system is the neutral point ungrounded system, then according to the fault type of each branch of the neutral point ungrounded system, the fault type of each branch corresponding to the first target test model corresponding to the neutral point ungrounded system is set. This helps to further set the resistance of each branch according to the first target test model with the set fault type, thereby better simulating the high resistance grounding and low resistance grounding situations of the neutral point ungrounded system in reality. This helps to solve the problem of difficulty in testing whether the performance of the low current grounding line selection device corresponding to the distribution network with new energy access meets the requirements when testing the low current grounding line selection device in the line selection system to be tested.

[0125] In another embodiment of this application, the process of setting the fault parameters of the target test model in step S130 is described, which may include the following steps:

[0126] Step S501: If the target power system is the arc-suppression coil grounding system, then based on the fault type of each branch of the arc-suppression coil grounding system, set the fault type of each branch corresponding to the second target test model corresponding to the arc-suppression coil grounding system.

[0127] Specifically, if the target power system is the arc-suppression coil grounded system, then steps S401 and S402 described above cannot be used to set faults and resistances in the target test model. It is necessary to further set the fault types for each branch of the second target test model corresponding to the arc-suppression coil grounded system based on the fault types of each branch. This fault setting can be achieved by applying a single-phase ground fault to each branch in the second target test model.

[0128] Step S502: For each branch fault type corresponding to the second target test model, set different grounding resistance parameters to simulate the high-resistance grounding and low-resistance grounding conditions of the arc suppression coil grounding system.

[0129] Specifically, as described above, step S501 can be used to set a corresponding fault for each branch of the second target test model. Furthermore, different grounding resistance parameters can be set to simulate different grounding conditions of the arc suppression coil grounding system.

[0130] in,

[0131] The grounding conditions of the arc suppression coil grounding system can include high-resistance grounding and low-resistance grounding, and different grounding conditions correspond to different fault types.

[0132] By setting different grounding resistances for each branch corresponding to the second target test model, the high-resistance grounding and low-resistance grounding situations of the arc-suppression coil grounding system in the real power distribution network environment can be simulated.

[0133] As can be seen from the above-described technical solutions, the method provided in this application embodiment can set fault parameters for the arc-suppression coil grounding system. If the target power system is the arc-suppression coil grounding system, then based on the fault type of each branch of the arc-suppression coil grounding system, the fault type of each branch corresponding to the second target test model corresponding to the arc-suppression coil grounding system is set. This helps to further set the grounding resistance of each branch according to the second target test model with the set fault types, thereby better simulating the high-resistance grounding and low-resistance grounding situations of the arc-suppression coil grounding system in reality. This helps to obtain the line selection performance test results of the small current grounding line selection device in the line selection system under test for different grounding faults corresponding to the arc-suppression coil grounding system when testing the line selection device in the line selection system under test. It can more accurately reflect the line selection performance of the small current grounding line selection device in the line selection system under test. It can solve the problem of difficulty in testing whether the performance of the small current grounding line selection device corresponding to the distribution network with new energy access meets the requirements.

[0134] In another embodiment of this application, the process of analyzing the fault location performance of the low-current grounding fault location device in the fault location system under test in step S140 is described. This process may include the following steps:

[0135] Step S601: If the target power system is the neutral point ungrounded system, obtain the fault signal of each branch of the first target test model to obtain the first target line selection result.

[0136] Specifically, if the target power system is the neutral point ungrounded system, it means that the model used in the current test is the first target test model. After setting the model parameters and fault parameters in steps S120 and S130, the fault signal of each branch of the first target test model can be obtained, and then the first target line selection result can be obtained.

[0137] By acquiring the fault signal of each branch corresponding to the first target test model, the line selection result of the low current grounding line selection device in the line selection system to be tested for the first target test model corresponding to the neutral point ungrounded system with new energy access can be analyzed and determined.

[0138] Step S602: Based on the first target line selection result and the fault status of each branch corresponding to the first target test model, analyze the line selection performance of the small current grounding line selection device in the line selection system to be tested in the neutral point ungrounded system.

[0139] Specifically, as described above, step S601 can obtain the line selection result of the low current grounding line selection device in the line selection system to be tested for the first target test model.

[0140] The low-current grounding fault location device in the fault location system under test includes the circuit breaker control command returned by the low-current grounding fault location device in the fault location system under test for the fault location result corresponding to the first target test model. The circuit breaker on each branch can be controlled by the circuit breaker control command returned by the low-current grounding fault location device in the fault location system under test. The circuit breaker on each branch responds to the circuit breaker control command returned by the low-current grounding fault location device in the fault location system under test and performs the corresponding operation, thereby obtaining the specific fault location result.

[0141] For example,

[0142] Assume that the operating status of the circuit breakers on each branch is controlled by the numbers 0 and 1, where 0 indicates a closed circuit and 1 indicates a closed circuit.

[0143] If the target test model has 3 branches, and a fault is set on the 3rd branch, after the above processing, the circuit breaker control command returned by the line selection device under test is "110", then the line selection result of the line selection device under test can be expressed as:

[0144] The first branch road is passable;

[0145] The second branch road is passable;

[0146] The third branch road is blocked.

[0147] This indicates that the low-current grounding fault location device in the fault location system under test ultimately selects the third branch.

[0148] Furthermore, based on the first target line selection result and the fault status of each branch corresponding to the first target test model, the line selection performance of the low-current grounding line selection device in the line selection system to be tested for the first target test model can be analyzed, and the line selection performance of the low-current grounding line selection device in the line selection system to be tested for the neutral point ungrounded system with new energy access can be further obtained.

[0149] Based on the fault status of each branch corresponding to the first target test model, the correct branch can be determined as the first target branch. By judging the selection result of the small current grounding selection device in the line selection system to be tested, it can be determined whether the first target branch has been selected. If so, it means that the small current grounding selection device in the line selection system to be tested can correctly select the line in the first target test model, and the line selection performance can meet the requirements. This further indicates that the small current grounding selection device in the line selection system to be tested can correctly select the line in the neutral point ungrounded system including new energy access, and the line selection performance can meet the requirements.

[0150] As can be seen from the above-described technical solutions, the method provided in this application embodiment can determine the selection result of the low-current grounding selection device in the line selection system under test by acquiring the fault signals of each branch corresponding to the first target test model. This helps to analyze the line selection performance of the low-current grounding selection device in the line selection system under test in the neutral point ungrounded system based on the line selection result of the low-current grounding selection device in the line selection system under test and the fault status of each branch corresponding to the first target test model. This application embodiment can analyze and determine whether the line selection performance of the low-current grounding selection device in the line selection system under test meets the requirements in the neutral point ungrounded system with new energy access based on the fault signals of each branch corresponding to the first target test model, thus solving the problem of difficulty in testing the performance of the corresponding line selection device in the neutral point ungrounded system with new energy access.

[0151] In another embodiment of this application, the process of analyzing the fault location performance of the low-current grounding fault location device in the fault location system under test in step S140 is described. This process may include the following steps:

[0152] Step S701: If the target power system is the grounded system via the arc suppression coil, obtain the fault signal of each branch of the second target test model to obtain the second target line selection result.

[0153] Specifically, if the target power system is the grounded system via the arc suppression coil, then the target test model is the second target test model, and the second target line selection result can be obtained by acquiring the fault signal of each branch of the second target test model.

[0154] By acquiring the fault signal of each branch of the second target test model, the line selection result of the low-current grounding line selection device in the line selection system to be tested for the second target test model corresponding to the arc-suppression coil grounding system of new energy access can be analyzed and determined.

[0155] Step S702: Based on the second target line selection result and the fault status of each branch corresponding to the second target test model, analyze the line selection performance of the small current grounding line selection device in the line selection system to be tested in the arc suppression coil grounding system.

[0156] Specifically, as described above, after step S701, the line selection result of the line selection device under test under the second target test model can be obtained. Furthermore, the line selection performance of the line selection device under test in the arc-suppression coil grounding system can be determined by the fault conditions of each branch corresponding to the second target test model.

[0157] After obtaining the line selection result of the low-current grounding line selection device in the line selection system under the second target test model, the correct line selection branch can be determined as the second target branch based on the fault status of each branch corresponding to the second target test model. Furthermore, it can be determined whether the branch selected by the low-current grounding line selection device in the line selection system under test is the second target branch. If so, it indicates that the low-current grounding line selection device in the line selection system under test can correctly select the line under the second target test model, and its line selection performance meets the requirements. This further indicates that the low-current grounding line selection device in the line selection system under test can correctly select the line under the arc-suppression coil grounding system including new energy access, and its line selection performance meets the requirements.

[0158] The following describes the process of testing the line selection performance of the low-current grounding line selection device in the line selection system under test.

[0159] refer to Figure 2 ,Figure 2 This is a hardware connection diagram of a line selection system including new energy access, as shown in an embodiment of this application. Figure 2 As shown, the target test model is built in a simulation workstation and compiled and simulated on a real-time simulator. A fault in the test model is triggered through the simulation workstation. The low-current ground fault location device in the fault location system under test (i.e., the low-current ground fault location device shown in the figure), and the new energy controller continuously obtain information about the target test model from the real-time simulator through an interface board and a power amplifier or terminal relay. This information includes analog quantities such as bus voltage and current, and digital quantities such as the circuit breaker's opening and closing status. Based on the obtained information, combined with the fault location logic and protection-related logic, circuit breaker control commands and other information are returned to the real-time simulator to obtain the fault location result of the low-current ground fault location device in the fault location system under test.

[0160] As can be seen from the technical solutions described above, the method provided in this application embodiment can determine the selection result of the low-current grounding selection device in the line selection system under test by acquiring the fault signals of each branch corresponding to the second target test model. This helps to analyze the line selection performance of the low-current grounding selection device in the line selection system under test in the arc-suppression coil grounding system based on the line selection result of the low-current grounding selection device in the line selection system under test and the fault status of each branch corresponding to the second target test model. This application embodiment can analyze and determine whether the line selection performance of the low-current grounding selection device in the line selection system under test meets the requirements in the arc-suppression coil grounding system containing new energy access based on the fault signals of each branch corresponding to the second target test model, thus solving the problem of difficulty in testing the performance of the line selection device corresponding to the arc-suppression coil grounding system containing new energy access.

[0161] The following describes the performance testing device for the line selection device provided in the embodiments of this application. The performance testing device for the line selection device described below can be referred to in correspondence with the performance testing method for the line selection device described above.

[0162] See Figure 5 , Figure 5 This is a schematic diagram of the structure of a line selection device performance testing device, which is an example of an embodiment of this application.

[0163] like Figure 5 As shown, the performance testing device for the line selection device may include:

[0164] The status detection module 11 is used to detect the connection signals between various devices in the line selection system under test, to ensure that each device in the line selection system under test is in a connected state.

[0165] Model building module 12 is used to build a target test model corresponding to the target power system;

[0166] The parameter setting module 13 is used to set the model parameters of the target test model according to the parameters of the target power system;

[0167] The fault parameter setting module 14 is used to set the fault parameters of the target test model;

[0168] The performance analysis module 15 is used to analyze the line selection performance of the low-current grounding line selection device in the line selection system to be tested based on the fault conditions of the target test model.

[0169] As can be seen from the above-described line selection device performance testing device, the state detection module 11 provided in this application embodiment can ensure that each device in the line selection system under test is in a connected state by detecting the connection signals of each device in the line selection system under test, thus eliminating the possibility that there may be damaged devices in the line selection system under test, which could lead to inaccurate test results. After ensuring that each device in the line selection system under test can be normally connected, the model construction module 12 can be used to construct a target test model corresponding to the target power system. The parameter setting module 13 can be used to set the model parameters of the target test model according to the parameters of the target power system, and the fault parameter setting module 14 can be used to set the fault parameters of the target test model. This helps to test the small current grounding line selection device in the line selection system under test based on the constructed target test model and the set model parameters and fault parameters. Furthermore, the performance analysis module 15 can be used to analyze the line selection performance of the small current grounding line selection device in the line selection system under test based on the fault conditions of the target test model, which helps to determine whether the line selection performance of the small current grounding line selection device in the line selection system under test meets the requirements. This application embodiment can, when testing the line selection performance of the low-current grounding line selection device in the line selection system to be tested, further determine the line selection performance of the low-current grounding line selection device in the line selection system to be tested under a power system with simulated new energy access by testing the line selection result of the low-current grounding line selection device in the line selection system to be tested on the target test model corresponding to the power system with simulated new energy access.

[0170] The specific processing flow of each unit included in the above-mentioned line selection device performance testing device can be found in the relevant introduction of the line selection device performance testing method section above, and will not be repeated here.

[0171] The line selection device performance testing device provided in this application embodiment can be applied to line selection device performance testing equipment, such as terminals: mobile phones, computers, etc. Optionally,Figure 6 The hardware structure block diagram of the line selection device performance testing equipment is shown. (Refer to...) Figure 6 The hardware structure of the line selection device performance testing equipment may include: at least one processor 1, at least one communication interface 2, at least one memory 3, and at least one communication bus 4.

[0172] In this embodiment, the number of processor 1, communication interface 2, memory 3, and communication bus 4 is at least one, and processor 1, communication interface 2, and memory 3 communicate with each other through communication bus 4.

[0173] Processor 1 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0174] Memory 3 may include high-speed RAM, and may also include non-volatile memory, such as at least one disk storage device;

[0175] The memory stores a program, which the processor can call. The program is used to implement the various processing steps in the aforementioned terminal line selection device performance test scheme.

[0176] This application embodiment also provides a readable storage medium that can store a program suitable for processor execution, the program being used to implement the various processing flows of the aforementioned terminal in the line selection device performance test scheme.

[0177] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0178] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0179] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Various embodiments can be combined with each other. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for testing the performance of a line selection device, characterized in that, include: The connection signals between various devices in the line selection system under test are detected to ensure that each device in the line selection system under test is in a connected state; the line selection system under test includes a distribution network with new energy access and is equipped with a new energy controller; the new energy controller is used to simulate the grid connection characteristics of the new energy system, and the operating characteristics when new energy is accessed by the new energy distribution network are simulated through the new energy controller. Construct a target test model corresponding to the target power system; the target test model is used to simulate the distribution network for new energy access; Based on the parameters of the target power system, set the model parameters of the target test model; Set the fault parameters of the target test model; Based on the fault conditions of the target test model, the line selection performance of the low-current grounding line selection device in the line selection system to be tested is analyzed. The construction of the target test model corresponding to the target power system includes: If the target power system is a neutral point ungrounded system, then based on the neutral point ungrounded system, a first target test model corresponding to the neutral point ungrounded system is constructed; If the target power system is a grounded system via an arc suppression coil, then a second target test model corresponding to the grounded system via an arc suppression coil is constructed based on the grounded system via an arc suppression coil.

2. The method according to claim 1, characterized in that, Setting the fault parameters of the target test model includes: If the target power system is the neutral point ungrounded system, then based on the fault type of each branch of the neutral point ungrounded system, the fault type of each branch corresponding to the first target test model corresponding to the neutral point ungrounded system is set; For each branch fault type corresponding to the first target test model, different grounding resistance parameters are set to simulate the high-resistance grounding and low-resistance grounding conditions of the neutral point ungrounded system.

3. The method according to claim 1, characterized in that, Setting the fault parameters of the target test model includes: If the target power system is the arc-suppression coil grounding system, then based on the fault type of each branch of the arc-suppression coil grounding system, the fault type of each branch corresponding to the second target test model corresponding to the arc-suppression coil grounding system is set. For each branch fault type corresponding to the second target test model, different grounding resistance parameters are set to simulate the high-resistance grounding and low-resistance grounding conditions of the arc suppression coil grounding system.

4. The method according to claim 2, characterized in that, The analysis of the fault conditions of the target test model, and the analysis of the fault location performance of the low-current grounding fault location device in the fault location system under test, includes: If the target power system is the neutral point ungrounded system, obtain the fault signal of each branch of the first target test model to obtain the first target line selection result; Based on the first target line selection result and the fault status of each branch corresponding to the first target test model, the line selection performance of the low current grounding line selection device in the line selection system to be tested in the neutral point ungrounded system is analyzed.

5. The method according to claim 2, characterized in that, The analysis of the fault conditions of the target test model, and the analysis of the fault location performance of the low-current grounding fault location device in the fault location system under test, includes: If the target power system is the grounded system via the arc suppression coil, obtain the fault signal of each branch of the second target test model to obtain the second target line selection result; Based on the second target line selection result and the fault status of each branch corresponding to the second target test model, the line selection performance of the low current grounding line selection device in the line selection system to be tested in the arc suppression coil grounding system is analyzed.

6. The method according to any one of claims 1-5, characterized in that, The connection signals between the devices in the line selection system under test are detected to ensure that all devices in the line selection system under test are in a connected state, including: Determine the normal connectivity signal range between each device in the line selection system to be tested; Based on the normal connectivity signal range between each device in the line selection system under test, determine whether the signal between each device in the line selection system under test is within the corresponding normal connectivity signal range. If the signals between the devices in the line selection system under test are within the corresponding normal connectivity signal range, then it is determined that the devices in the line selection system under test are in a connected state.

7. A performance testing device for a line selection device, characterized in that, include: The status detection module is used to detect the connection signals between various devices in the line selection system under test to ensure that each device in the line selection system under test is in a connected state; the line selection system under test includes a distribution network with new energy access and is equipped with a new energy controller; the new energy controller is used to simulate the grid connection characteristics of the new energy system, and to simulate the operating characteristics when new energy is accessed by the distribution network. The model building module is used to build a target test model corresponding to the target power system. The target test model is used to simulate the distribution network for new energy access; The construction of the target test model corresponding to the target power system includes: If the target power system is a neutral point ungrounded system, then based on the neutral point ungrounded system, a first target test model corresponding to the neutral point ungrounded system is constructed; If the target power system is a grounded system with an arc suppression coil, then a second target test model corresponding to the grounded system with an arc suppression coil is constructed based on the grounded system with an arc suppression coil. The parameter setting module is used to set the model parameters of the target test model based on the parameters of the target power system. The fault parameter setting module is used to set the fault parameters of the target test model; The performance analysis module is used to analyze the line selection performance of the low-current grounding line selection device in the line selection system under test based on the fault conditions of the target test model.

8. A performance testing device for a line selection apparatus, characterized in that, include: One or more processors, and memory; The memory stores computer-readable instructions, which, when executed by the one or more processors, implement the steps of the line selection device performance testing method as described in any one of claims 1 to 6.

9. A readable storage medium, characterized in that: The readable storage medium stores computer-readable instructions that, when executed by one or more processors, cause the one or more processors to perform the steps of the line selection device performance testing method as described in any one of claims 1 to 6.

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