Through-type test method and device for secondary system of intelligent substation

Abstract

The invention relates to the technical field of intelligent substation secondary system testing, and provides a through-type testing method and device for an intelligent substation secondary system, and the method comprises the steps: injecting test data collected by a collection simulator into a merging unit, so as to drive the secondary system to work; switch state information of an intelligent operation box in the secondary system is received through a switch simulator, and the switch state information comprises switch displacement information and switch position information; according to the switch state information, a protection whole group linkage test is carried out on the secondary system, and the protection types of the protection whole group linkage test comprise single-interval protection, hierarchical protection and multi-source information protection. According to the invention, on the basis of maintaining the integrity of the connection of the secondary system and the integrity of the input information, the protection whole group linkage of the secondary system is subjected to complete and effective testing in combination with different protection types, the on-site testing quality and efficiency of the transformer substation are improved, and the power grid safety and stable operation of the power grid are facilitated.

Description

Technical Field

[0001] The present disclosure relates to the technical field of secondary system testing of smart substations, and in particular to a through-type testing method and device for a secondary system of a smart substation. Background Art

[0002] With the promotion and construction of smart grids, the traditional way of transmitting electrical signals with cables as the medium has been replaced by optical fiber digitalization. Information is no longer a single point-to-point communication method, but can be transmitted by building a new communication network. At the same time, the correlation between a single device and other devices in a smart substation is also closer, and some new protection devices need to be judged based on the output information of multiple devices. How to verify these complex information organization relationships and comprehensive protection and control functions is a problem that must be solved in the detection work before the commissioning of smart substations.

[0003] At present, the test methods of the secondary system of smart substations mainly focus on the functional inspection of single equipment. In field tests, it is difficult to involve equipment correlation inspection and network behavior inspection. The test work lacks integrity and correlation, which is not conducive to the safety and stable operation of the power grid. In addition, the test of the secondary equipment of smart substations requires carrying multiple sets of different types of single test equipment, which not only increases manpower and material resources, but also has low test efficiency. Summary of the invention

[0004] The purpose of the embodiments of the present disclosure is to provide a through-test method and device for the secondary system of a smart substation, so as to at least solve the technical problems existing in the prior art that the secondary system test lacks integrity and relevance, is not conducive to the safety and stable operation of the power grid, and has low test efficiency.

[0005] In order to solve the above technical problems, the embodiments of the present disclosure adopt the following technical solutions:

[0006] In a first aspect, an embodiment of the present disclosure provides a through-type testing method for a secondary system of a smart substation, comprising:

[0007] Injecting the test data collected by the acquisition simulator into the merging unit to drive the secondary system to work, wherein the test data includes electromagnetic transient simulation data of the primary system;

[0008] Receiving switch status information of the intelligent operation box in the secondary system through a switch simulator, wherein the switch status information includes switch displacement information and switch position information;

[0009] A protection group linkage test is performed on the secondary system according to the switch status information, wherein the protection types of the protection group linkage test include single-interval protection, hierarchical protection and multi-source information protection.

[0010] In some embodiments, performing a protection group linkage test on the secondary system according to the switch status information includes:

[0011] Testing the correctness of the protection group linkage behavior according to the time data corresponding to the switch status information and the corresponding relationship of the switch status information under the same time coordinate axis;

[0012] According to the time intervals between the behaviors in the protection whole group linkage behavior, the performance index of the protection whole group linkage behavior is tested.

[0013] In some embodiments, performing a protection group linkage test on the secondary system according to the switch status information includes:

[0014] Determine the logical links between the injection of the test data and the operation of the circuit breaker of the protection device;

[0015] Fault detection and location are performed on the entire protection linkage behavior according to the timing relationship of each of the logical links and the switch displacement information.

[0016] In some embodiments, the method further comprises:

[0017] The test scheme is determined according to the protection type of the protection group linkage test.

[0018] In some embodiments, if the protection type of the protection group linkage test is single-interval protection, determining a test scheme according to the protection type of the protection group linkage behavior includes:

[0019] According to the type of line protection in the single bay protection, simulating the corresponding fault type through electromagnetic transient simulation;

[0020] Testing the linkage behavior of the entire protection group according to the fault type;

[0021] Among them, if the type of line protection is zero-sequence current protection, set a one-phase or two-phase instantaneous grounding fault for fault simulation, and test the entire action loop of the entire linkage behavior of the protection group; if the type of line protection is power frequency variable protection, perform fault simulation on at least one fault type among phase-to-phase short circuit, single-phase grounding, and three-phase short circuit, and check the protection action behavior under each fault type respectively.

[0022] In some embodiments, the single-interval protection includes distance protection, and the method further includes:

[0023] A fault point is set in the line, and the distance measurement function of the secondary system is tested according to the fault point.

[0024] In some embodiments, if the protection type of the protection group linkage test is multi-source information protection, the test data further includes current input polarity data, and a test scheme is determined according to the protection type of the protection group linkage test, including:

[0025] injecting the current input polarity data into the merging unit;

[0026] Checking the current input polarity according to the phase relationship between the current and voltage collected from the protection device;

[0027] If the protection type of the protection group linkage test is hierarchical protection, determining a test scheme according to the protection type of the protection group linkage test includes:

[0028] Test the coordination and information consistency between the protections with cascade relationship in the cascade protection;

[0029] After the cascade protection fails, the protection in the same area as the protection in the cascade protection is tested.

[0030] In some embodiments, before simulating a system to obtain the test data, the method further includes:

[0031] The simulation mode of the primary system is determined according to a test scenario, wherein the simulation mode includes an offline closed-loop mode and a real-time closed-loop mode.

[0032] In a second aspect, an embodiment of the present disclosure provides a through-type test device for a secondary system of a smart substation, comprising:

[0033] An injection module is configured to inject the test data collected by the acquisition simulator into the merging unit to drive the secondary system to work, wherein the test data includes electromagnetic transient simulation data of the primary system;

[0034] A receiving module, configured to receive switch status information of the intelligent operation box in the secondary system through a switch simulator, wherein the switch status information includes switch displacement information and switch position information;

[0035] The test module is configured to perform a protection group linkage test on the secondary system according to the switch status information, wherein the protection types of the protection group linkage test include single-interval protection, hierarchical protection and multi-source information protection.

[0036] The disclosed embodiments provide a through-test method and device for a secondary system of an intelligent substation. The method and device drive the operation of the secondary system by injecting test data collected by a collection simulator into a merging unit, wherein the test data include electromagnetic transient simulation data of a primary system. Then, the switch status information of an intelligent operation box in the secondary system is received through a switch simulator, wherein the switch status information includes switch displacement information and switch position information. Thereafter, a protection group linkage test is performed on the secondary system according to the switch status information, wherein the protection types of the protection group linkage test include single-interval protection, hierarchical protection and multi-source information protection. On the basis of maintaining the integrity of the connection of the secondary system and the integrity of the input information, the protection group linkage of the secondary system can be completely and effectively tested in combination with different protection types, thereby improving the quality and efficiency of on-site testing of substations, and being beneficial to the safety of the power grid and the stable operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 It is an architecture diagram of the secondary system of the smart substation according to an embodiment of the present disclosure;

[0039] Figure 2 It is a flow chart of a through-type testing method of a secondary system of a smart substation according to an embodiment of the present disclosure;

[0040] Figure 3 A primary wiring diagram of a substation in an embodiment of the present disclosure;

[0041] Figure 4 A composite diagram of the test data and switch displacement information of the embodiment of the present disclosure;

[0042] Figure 5 Behavior logic for protecting the entire group linkage behavior of the secondary system of the embodiment of the present disclosure;

[0043] Figure 6 It is a single bay protection whole group linkage test scheme of the embodiment of the present disclosure;

[0044] Figure 7 A whole set of linkage test solutions for multi-source information protection in an embodiment of the present disclosure;

[0045] Figure 8 A hierarchical protection whole group linkage test solution for an embodiment of the present disclosure;

[0046] Fig. 9 The waveforms of voltage and current test signals of the line voltage in the hierarchical protection whole group linkage test solution of the embodiment of the present disclosure are in a cascade mode;

[0047] Fig.10 It is a deployment diagram of the station control layer equipment performance test system according to an embodiment of the present disclosure;

[0048] Fig.11 A deployment diagram of a time synchronization tool software module according to an embodiment of the present disclosure;

[0049] Fig.12 This is a test architecture diagram of the station control layer equipment performance detection system according to an embodiment of the present disclosure;

[0050] Fig.13 This is a test flow chart of the station control layer equipment performance detection system according to an embodiment of the present disclosure;

[0051] Fig.14 It is a structural schematic diagram of a through-type test device for a secondary system of a smart substation according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0052] Various aspects and features of the present disclosure are described herein with reference to the drawings.

[0053] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0054] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0055] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the attached drawings.

[0056] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0057] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0058] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments claimed are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0059] Figure 1 The architecture diagram of the secondary system of the smart substation according to the embodiment of the present disclosure is shown as follows: Figure 1 As shown in the figure, the secondary system of the smart substation follows the IEC61850 specification in its construction, including electronic equipment at the process layer, bay layer, and station control layer, and network wiring at each layer.

[0060] Among them, the process layer mainly includes merging units, intelligent operation boxes and other equipment, which are responsible for transmitting primary acquisition information, switch status information and secondary to primary operation commands, etc. The acquisition information is transmitted to the interval layer based on the IEC618509-2 protocol, and the switch status information and secondary to primary operation commands (such as position change commands) are interacted through the GOOSE protocol. In terms of specific implementation methods, there are two situations at the same time. One is that the acquisition information and switch status information are networked through optical fiber switches to realize the "network acquisition and network jump" function. The other is that the acquisition information, switch status information and the relevant equipment of the interval layer are connected one-to-one to realize the "direct acquisition and direct jump" function.

[0061] The bay layer mainly includes various protection devices (such as local protection devices), measurement and control devices, metering devices and other monitoring devices. These devices realize their own protection, control and measurement logic through information interaction with the process layer. At the same time, the equipment in this layer is also responsible for information transmission between the station control layer and the station control layer through the fiber optic switch of the station control layer. The transmission protocol follows the mms message format of IEC61850. The transmission content includes primary switch information, transformer status information, secondary equipment status information, remote control commands, etc. Since this layer contains the core equipment of the secondary system (protection and measurement and control equipment) and involves many functions, it is the focus of the secondary system inspection on the substation site.

[0062] The station control layer equipment mainly includes the whole station monitoring platform, security substation, etc. By parsing the MMS message, this type of equipment displays the whole station operation status and alarm information in the main control room, and completes the function of uploading status information to the dispatching end at regular intervals through the high-speed synchronous optical fiber network, as well as the reception and forwarding of remote action instructions.

[0063] As can be seen from the above, in the actual construction of the secondary system of the smart substation, there are characteristics such as complex information organization and distribution, numerous logical function associations, and information interaction networking, which poses a great challenge to the integrity of the test work. In order to objectively evaluate the correctness of the secondary system behavior, the following principles should be followed in the field test:

[0064] 1) Smart substations are different from traditional substations in that they are no longer customized. That is, all configurations and wiring need to be completed on site, and cannot be simply customized in a laboratory. The impact of the on-site environment and human construction factors on the secondary system cannot be ignored. Therefore, the state of the on-site test object should be consistent with the actual operating state of the substation after it is put into operation.

[0065] 2) The ultimate goal of field testing is to verify whether the response behavior of the secondary system under various operating conditions is correct. Therefore, the equipment links covered by the test method should also be consistent with the scope of the links involved in the secondary system during actual operation.

[0066] 3) The secondary system of the smart substation is a system that integrates networking and informationization. Its functions are realized through the cooperation of many devices. Any test on a single device or a few devices cannot reflect the correctness of the whole system.

[0067] In view of this, the embodiment of the present disclosure provides a through-test method for the secondary system of a smart substation, which regards the on-site secondary system of the smart substation as a whole, and includes the merging unit, network switch, fiber optic communication network and intelligent operation box that complete the information organization and distribution functions of the smart substation into the test scope, and performs a through-test on the protection group linkage behavior, multi-level protection and cross-interval protection of the secondary system.

[0068] Embodiment 1

[0069] Figure 2 A flow chart of a through-type test method for a secondary system of a smart substation according to an embodiment of the present disclosure is shown. Figure 2 As shown, a through-type testing method for a secondary system of a smart substation provided by an embodiment of the present disclosure includes:

[0070] S101: injecting test data collected by the acquisition simulator into a merging unit to drive the secondary system to work, wherein the test data includes electromagnetic transient simulation data of the primary system.

[0071] Among them, the test object of the through-test is the complete smart substation secondary system, and the network interconnection between devices is also included in the test scope. Therefore, during the test process, the integrity of the secondary system connection and the integrity of the input information must be maintained to achieve the purpose of testing the functions and technical performance of the smart substation secondary system.

[0072] When the secondary system is in actual operation, it collects primary system information as input signals. However, it is not advisable to access a live primary system during the test phase. Therefore, in this embodiment, a time domain simulation is used to replace the actual primary system output. The simulation takes the primary main wiring of the substation and the associated lines and generator sets as the objects. By setting the operating condition parameters, the power frequency and transient signals required for the operation of the secondary system can be obtained. In power quality monitoring, transient signals mainly refer to disturbance signals such as voltage sag, voltage swell and short-term voltage interruption, which have an impact on the stable operation of the power system.

[0073] In specific implementation, the time domain simulation of the primary system can be performed through the substation simulation software platform. The substation simulation software platform provides a graphical substation or power grid component modeling interface, and forms a primary wiring diagram based on the connection relationship. Parameters can be set for components such as PI-type lines, distributed parameter lines, three-phase transformers, circuit breakers, etc. And faults can be set at any node location. The simulation software platform can perform electromagnetic transient simulation or distribute electromagnetic transient calculation tasks according to the above parameter settings, and transmit the simulation results (electromagnetic transient simulation data) or task configuration information to the acquisition simulator through the wireless control host.

[0074] The substation simulation software platform, acquisition simulator, switch simulator and wireless control host constitute a through-test system to implement the above-mentioned through-test method.

[0075] The acquisition simulator, as a sampling value interface device, collects the test data obtained through the time domain simulation in real time, and injects the collected test data into the merging unit of the secondary system in real time to drive the secondary system to work, thereby completing the inspection and testing of various functions. The merging unit is an interface device for the secondary system. In this embodiment, the acquisition simulator is used to replace the mutual inductor to separate the primary system from the secondary system at the test site. The acquisition simulator simulates the output characteristics of the mutual inductor by receiving the electromagnetic transient simulation data of the simulation software platform, injects the test data into the merging unit in real time, and drives the secondary system to respond. The acquisition simulator can ensure the integrity of the input information.

[0076] The number of acquisition simulators used is determined by the transformer configuration, merging unit configuration, and the requirements of the test project.

[0077] In some embodiments, before simulating a system to obtain the test data, the method further includes:

[0078] The simulation mode of the primary system is determined according to a test scenario, wherein the simulation mode includes an offline closed-loop mode and a real-time closed-loop mode.

[0079] Ideally, electromagnetic transient simulation should be calculated in real time according to the actual state of the switch, generate test data under various working conditions, and complete real-time closed-loop testing to solve complex working condition simulation problems such as reclosing and fault recovery. The minimum sampling interval of the existing merging unit of the smart substation is 100μs. Combined with the distributed structure of the through-type test system, if online closed-loop testing is to be achieved, the sum of the simulation calculation time and the wireless data transmission time needs to be within 100μs. Considering the constraints of the substation simulation scale and the wireless transmission capacity on the test system, this requirement cannot be guaranteed to be met in any occasion. Therefore, the through-type test system can provide two simulation modes.

[0080] The first is the offline closed-loop simulation mode. This mode pre-sets the test scenario state and component action time according to the time axis, and performs calculations in different sections for different working conditions. All state time domain data of the set scenario can be obtained in one simulation and sent to the corresponding acquisition simulators. In this mode, the entire simulation calculation process is completely completed by the simulation software platform, and the acquisition simulator is only responsible for offline reception and real-time injection of data.

[0081] The second is the real-time closed-loop simulation mode. The difference between this mode and the offline closed-loop mode is that the switch change time is no longer pre-set, but is determined by the switch position information directly fed back. Electromagnetic transient simulation needs to determine whether the switch has changed position before each step calculation starts to determine the operating status of the next step.

[0082] Before the start of the through-test, the primary main wiring diagram of the substation to be tested is constructed through the substation simulation software platform, and the parameters of the corresponding components and lines are configured. The simulation software platform then transmits the corresponding simulation results and parameters to each acquisition simulator according to the simulation mode selected by the operator. Then the clocks of each simulator are adjusted through wireless time synchronization to achieve full system synchronization. After all the work is ready, the simulation software platform sends the start time of the test. When the local clocks of each acquisition simulator reach this time, the real-time injection process of the test data starts synchronously.

[0083] In this embodiment, the actual wiring of the secondary system under test is as consistent as possible with the actual substation design to maintain the integrity of the secondary system under test.

[0084] S102: Receive switch status information of the intelligent operation box in the secondary system through a switch simulator.

[0085] The behavior of the secondary system is ultimately manifested as the displacement of the driving switch. A loop is formed between the intelligent operation box and the actual switch. The switch displacement information of the intelligent operation box is the behavior result of the secondary system, and the overall action behavior of the secondary system can be judged based on the behavior result.

[0086] The switch simulator is connected in parallel with the switch circuit of the actual primary system, and is used to receive the relevant parameters and state quantities of the intelligent operation box. In this embodiment, the switch state information of the switch is mainly received, wherein the switch state information includes the above-mentioned switch change (switch change action) signal and switch position information. The switch state information of the intelligent operation box received by the switch simulator is an analog signal, and the switch simulator can convert the analog signal into digital information, add a time stamp, and feed it back to the substation simulation software platform.

[0087] In order to complete the system-level test project in the substation, multiple acquisition simulators and switch simulators are used, which have distributed characteristics. Considering the on-site environmental factors, the simulation software platform exchanges data with the simulator through wireless communication. At the same time, on the other hand, the simulators must be synchronized to ensure that the test data is consistent with the actual operating conditions. Therefore, wireless synchronization technology is used during the test, and the master clock in the wireless control host and the slave clock in each simulator are synchronized, so that the simulation software platform, acquisition simulator, and switch simulator are under the same reference clock.

[0088] In this embodiment, the acquisition simulator and the switch simulator can be arranged separately. When an integrated switch cabinet is used at the substation site, the merging unit and the intelligent operation box are often placed in the same cabinet. In this case, the switch simulator can be integrated into the acquisition simulator.

[0089] S103: performing a protection group linkage test on the secondary system according to the switch status information, wherein the protection types of the protection group linkage test include single-interval protection, hierarchical protection and multi-source information protection.

[0090] After obtaining the switch status information of the intelligent operation box through the switch simulator, the substation simulation software platform can test the system-level function of the protection linkage of the secondary system according to the above switch status information. At the same time, during the protection linkage test, single-interval protection, hierarchical protection and multi-source information protection are integrated into it to realize the through-test of the secondary system.

[0091] From the above, it can be seen that in this embodiment, technologies such as power grid simulation, distributed transmission of information, and synchronous signal injection are used to complete the overall protection linkage test of the substation secondary system. The test objects cover the secondary equipment in each link that realizes a specific function. It can realize a complete test of the functions and technical performance of the secondary system in the substation, improve the quality and efficiency of on-site testing of the substation, and provide effective and reliable technical means for the construction of smart substations.

[0092] The through-test method of the secondary system of the smart substation provided by the embodiment of the present disclosure drives the secondary system to work by injecting the test data collected by the acquisition simulator into the merging unit, wherein the test data includes the electromagnetic transient simulation data of the primary system; then, the switch status information of the intelligent operation box in the secondary system is received through the switch simulator, wherein the switch status information includes switch displacement information and switch position information; thereafter, the secondary system is subjected to a protection whole group linkage test according to the switch status information, wherein the protection types of the protection whole group linkage test include single-interval protection, hierarchical protection and multi-source information protection, and the protection whole group linkage of the secondary system can be completely and effectively tested in combination with different protection types on the basis of maintaining the integrity of the connection of the secondary system and the integrity of the input information, thereby improving the quality and efficiency of on-site testing of the substation, and being beneficial to the safety of the power grid and the stable operation of the power grid.

[0093] The through-test method of the disclosed embodiment combines the protection group linkage behavior as the core function of the secondary system with system-level tests such as multi-level and cross-interval protection, and effectively tests the protection group linkage that is difficult to perform on-site, especially the hierarchical (cascade type) protection, to ensure the safe and stable operation of the power grid.

[0094] In some embodiments, in step S103, performing a protection group linkage test on the secondary system according to the switch status information includes:

[0095] S1031: testing the correctness of the protection group linkage behavior according to the time data corresponding to the switch state information and the corresponding relationship of the switch state information under the same time coordinate axis;

[0096] S1032: Testing the performance index of the protection whole group linkage behavior according to the time interval between each behavior in the protection whole group linkage behavior.

[0097] The through-type test injects test data through the acquisition simulator, and feeds back the position and displacement information of the circuit breaker and isolating switch through the switch simulator, so as to realize the closed-loop test of the protection of the entire linkage.

[0098] Since the internal clocks of the acquisition simulator and switch simulator are synchronized with the main clock, the test data and switch quantity information have a corresponding relationship under the same time coordinate axis. Therefore, the entire set of timing behavior identification of the switch position change of the power grid fault state protection action can be completed, that is, the secondary system can be tested for the entire set of linkage behavior of the protection based on time data.

[0099] Take the protection group behavior inspection of a two-phase short-circuit fault in a substation line as an example. Figure 3As shown. When a short circuit fault occurs between phases AB in line 2, the current and voltage test data at CT2 and PT2 are generated by electromagnetic transient simulation and injected into the line merging unit, and the state of circuit breaker Breaker L2 is recovered through the switch simulator. The collected values ​​of the three-phase current, voltage instantaneous value waveform and other test data during the full test process and the switch displacement information can be synthesized as Figure 4 Composite image shown.

[0100] Depend on Figure 4 It can be seen that the AB phase fault in this test occurred at 0.5s (with the start of the test as 0); at 0.525s, the line protection output tripped A and B, and the intelligent operation box returned the received trip command message at 0.569s; at 0.6065s, the AB two-phase circuit breaker changed to open. Figure 4 The sampling values ​​(test data), the correctness of the switch state and the corresponding time stamp can not only qualitatively check whether the functional behavior of the entire line protection group is correct, but also judge the performance indicators of the entire protection group linkage behavior through the time data between the behaviors (for example, whether the line protection output trips in time after the AB phase fault occurs).

[0101] From the above, it can be seen that the simulation software platform can establish a timing relationship based on the switch status information and switch status time information obtained from the injection test data test to complete the identification of the correctness of the entire protection linkage behavior of the secondary system.

[0102] In some embodiments, in step S103, performing a protection group linkage test on the secondary system according to the switch status information includes:

[0103] S1033: Determine the logical links between the injection of the test data to the circuit breaker action of the protection device;

[0104] S1034: Perform fault detection and location on the entire protection linkage behavior according to the timing relationship of each of the logic links and the switch change information.

[0105] When testing the secondary system of the smart substation, it is necessary not only to check whether the protection linkage function of the entire group is correct, but also to further locate the cause of the fault when a fault is detected (anomaly is found) to facilitate on-site elimination. Therefore, in steps S1033 and S1034, the test results such as the switch status information are evaluated, fault detection is performed, and fault location is performed.

[0106] The behavioral logic relationship between each working link of the secondary system is the basis for the identification of the test function of the whole group linkage of the through-type protection. Taking the whole group linkage of the single-bay protection as an example, Figure 5 The logical links from test data injection to circuit breaker action are shown. Figure 5The protection device is subdivided into three logical links: protection logic (mainly setting the setting value), protection function switching, and protection command word setting. Any abnormality in any link will cause the circuit breaker to malfunction or refuse to operate. In addition, these links meet a strict sequential relationship. The abnormality in a certain link will only affect the next link and has nothing to do with the previous link. Therefore, if the timing status of each link can be obtained, the fault link can be accurately located when an abnormality occurs.

[0107] The acquisition of the states of the above-mentioned logical links, except for the signal between the intelligent operation box and the circuit breaker, can be obtained by the secondary system itself at the intelligent substation site. The signal between the intelligent operation box and the circuit breaker is the switch position information obtained by the above-mentioned switch simulator for feedback of the tripping signal of the intelligent operation box and the switch position information corresponding to the switch position information. The switch position information and switch position information can be used to detect and locate the fault of the entire protection linkage behavior.

[0108] In some embodiments, the method further comprises:

[0109] S104: Determine a test plan according to the protection type of the protection group linkage test.

[0110] Before conducting a whole-group linkage test of the through-type protection, it is necessary to consider various types of protection functions, design corresponding through-type test schemes, and then inject the test data into the merging unit to drive the secondary system to work for testing, so as to meet different protection test requirements.

[0111] In some embodiments, if the protection type of the protection group linkage test is single-interval protection, in step S104, determining a test scheme according to the protection type of the protection group linkage behavior includes:

[0112] S201: According to the type of line protection in the single bay protection, simulating a corresponding fault type through electromagnetic transient simulation;

[0113] S202: Testing the linkage behavior of the entire protection group according to the fault type.

[0114] Single bay protection is mainly line protection. For the through-type test of this type of protection, it is only necessary to inject the electromagnetic transient simulation results of the three-phase current and three-phase voltage of the line into the line merging unit in real time. The test plan is as follows: Figure 6 shown.

[0115] Considering that line protection uses a variety of protection algorithms to make judgments for different fault types, there needs to be some distinction in the fault types simulated by the electromagnetic transient calculation to facilitate the sub-item testing of each protection algorithm.

[0116] Furthermore, if the type of line protection is zero-sequence current protection, a one-phase or two-phase instantaneous ground fault is set to perform fault simulation, and the entire action loop of the entire linkage behavior of the protection group is tested. Zero-sequence current protection is mainly used to respond to ground short-circuit faults occurring inside or outside the transformer. This protection method is implemented by detecting zero-sequence current. When a ground fault occurs, the zero-sequence current protection will be activated to disconnect the circuit breakers on both sides of the transformer to prevent the fault from expanding.

[0117] If the type of line protection is power frequency variation protection, perform fault simulation on at least one fault type among phase-to-phase short circuit, single-phase grounding, and three-phase short circuit, and check the protection action behavior under each fault type. Power frequency variation protection is a protection measure that uses the power frequency component characteristics of the voltage and current that appear when a short circuit occurs in a transmission line to identify faults and start protection.

[0118] As mentioned above, when conducting a whole group test of a single-interval protection, different fault types can be simulated according to the type of line protection, and different test schemes can be designed to accurately and effectively test the protection action behavior under each fault type, thereby improving the test effect.

[0119] In some embodiments, the single-interval protection includes distance protection, and the method further includes:

[0120] A fault point is set in the line, and the distance measurement function of the secondary system is tested according to the fault point.

[0121] For distance protection, its distance measurement function should also be tested when the protection group linkage test is carried out. For example, the fault points can be set at 0%, 10%, 25%, and 50% of the line respectively, so as to use the above fault points to perform distance measurement function detection.

[0122] The above-mentioned single-bay protection whole group test often only requires one acquisition simulator. Therefore, during on-site testing in the substation, multiple single-bay lines can be set up to carry out testing experiments at the same time, thereby improving testing efficiency.

[0123] In some embodiments, if the protection type of the protection group linkage test is multi-source information protection, the test data also includes current input polarity data. In step S104, a test scheme is determined according to the protection type of the protection group linkage test, including:

[0124] S301: injecting the current input polarity data into the merging unit;

[0125] S302: Check the current input polarity according to the phase relationship between the current and voltage collected from the protection device.

[0126] like Figure 7As shown in the figure, the typical representative of multi-source information protection is transformer protection. To test the correctness of its function, the whole linkage test method of through-type protection can simultaneously inject electromagnetic transient simulation data into the high, medium and low side merging units. In fault simulation, various interphase short circuits and grounding faults outside and inside the zone can be set to verify the action behavior of the protection on the three sides.

[0127] At the same time, in the test of transformer protection, the current input polarity is also an important test item. Therefore, the through-type test can set the polarity end of the transformer according to the on-site situation on the simulation software platform, and then simulate and generate steady-state test data, which are injected into the three-side merging unit of the transformer protection by the acquisition simulator. Finally, the polarity check can be completed by the current and voltage phase relationship observed on the transformer protection device.

[0128] In some embodiments, if the protection type of the protection group linkage test is hierarchical protection, in step S104, determining a test scheme according to the protection type of the protection group linkage test includes:

[0129] S401: Testing the coordination and information consistency between the protections with cascade relationship in the cascade protection;

[0130] S402: After the cascade protection fails, testing the protection in the same area as the protection in the cascade protection.

[0131] like Figure 8 As shown in the figure, hierarchical protection refers to a type of protection that has a cascade relationship between busbar protection and interval line protection, and between busbar protection and transformer protection. High-level protection covers the area of ​​low-level protection. Therefore, when testing the entire group of such protections, it is necessary not only to consider the verification of individual protection functions, but also to test the coordination between protections and the consistency of information. At the same time, after a type of protection fails, whether the protection in the same area can operate accurately is also a test item that must be carried out in the through-type test.

[0132] From the perspective of the field test environment, the configuration of the merging unit of this type of protection is relatively flexible. For example, the voltage input of the line merging unit can come from the voltage channel of the bus merging unit. In this case, the test requires two acquisition simulators to inject current signals from the line merging unit and voltage signals from the bus merging unit respectively. Therefore, the test method is similar to the test of the multi-source information protection mentioned above.

[0133] Fig. 9 The waveforms of the three-phase short-circuit voltage and current when the line merging unit and the bus merging unit are cascaded. Fig. 9 As shown, the three-phase voltage simulation data of I mother is Fig. 9The acquisition simulator 2# is injected into the bus merging unit, and the three-phase current simulation data of the red Ⅰ line is injected into the line merging unit through the acquisition simulator 1# to realize the three-phase short-circuit protection test of the line under the cascade voltage condition.

[0134] In some embodiments, the method further comprises:

[0135] S501: Construct station control layer equipment performance test system;

[0136] S502: Through the station control layer equipment performance test system, the performance of the station control layer equipment in the secondary system of the smart substation is tested under the data avalanche state. The smart substation adopts a hierarchical networking communication mode to realize the sharing and interoperability of data within the station and between substations. The data of each layer of the substation are concentrated in the station control layer in the secondary system of the smart substation. The station control layer equipment completes the functions of data reception, storage, processing, display and forwarding, which is the key link of the smart substation. The station control layer equipment mainly includes various data servers and application servers, various workstations, communication gateways and switches, data concentrators and application terminals, etc. Various devices work together to complete the collection and processing of various data in the station, realize the operation monitoring, operation and control of the equipment in the station, comprehensive information analysis, as well as intelligent warning, anti-error locking and other functions, forming an integrated monitoring system for smart substations.

[0137] The station control layer equipment communicates with the interval layer equipment through the station control layer network. The interactive information flows are divided into six categories: protection information flow, measurement information flow, control information flow, status monitoring information flow, alarm information flow, and metering information flow. These information flows not only carry relevant information about the operation of the substation, but also affect the performance indicators of the working status of the station control layer equipment. The indicators that describe the working status of the station control layer equipment mainly include: CPU load rate, network load rate, memory occupancy rate, system response time, avalanche response capability, etc. When data avalanche occurs, a large amount of data will be generated in a short period of time, which will bring severe tests to the performance of the station control layer equipment and directly test the working status of related equipment. Therefore, under the state of data avalanche, testing the performance of the station control layer equipment is one of the most important test contents.

[0138] The performance test of the station control layer equipment needs to be carried out under two conditions: normal working state and fault state (avalanche condition). Under the avalanche state, each index of the station control layer equipment will reach dozens of times of each index under the normal working state. Therefore, as long as the performance index of the station control layer equipment meets the limit values ​​of each index under the avalanche condition, it will definitely meet the index requirements under normal working state.

[0139] Therefore, in this embodiment, the performance index test of the station control layer equipment under the avalanche test condition is mainly analyzed in detail, and the performance test during normal operation is not described in detail.

[0140] In this embodiment, a station control layer equipment performance test system is designed for the station control layer equipment of the smart substation based on the structure and function of the smart substation monitoring integrated system. The station control layer equipment performance test system is based on a small industrial computer or PC to build an avalanche simulation server, which complies with the IEC61850 standard and can control the type and amount of avalanche data through software to achieve the purpose of simulating the data communication of the interval layer equipment. The station control layer equipment performance acquisition module connected to the system to be tested collects data reflecting the performance of the system to be tested, and completes the test analysis of the performance of the station control layer equipment under the data avalanche state.

[0141] like Fig.10 As shown, the architecture of the station control layer equipment performance test system includes the system to be tested, the avalanche simulation server and the detection workstation. The system to be tested deploys the corresponding platform software, the station control layer equipment performance collection module and the time synchronization client according to the actual situation of the automation manufacturer; the avalanche simulation server deploys the avalanche simulation configuration module, the avalanche simulation service module and the time synchronization client module; the detection workstation deploys the station control layer equipment performance data analysis module and the time synchronization service module.

[0142] Among them, in the system to be tested, according to the actual situation of the party to be tested, the corresponding software (intelligent substation integrated monitoring software) is deployed on the station control layer equipment. The station control layer equipment performance acquisition module is responsible for collecting the operation information of the station control layer equipment during normal operation and avalanche failure, and sending the operation information to the detection workstation. The time synchronization client module is used to send time synchronization requests and receive time synchronization messages from the time synchronization service, verify the local time and thus achieve time synchronization.

[0143] The avalanche simulation server includes an avalanche simulation configuration module, an avalanche simulation service module and a time synchronization client module. The avalanche simulation configuration module is responsible for parsing the SCD file and loading the IED device model to create a virtual IED device. The avalanche simulation service module manages the created virtual IED device and controls the start and stop of the virtual IED device. It has the ability to generate a large number of telesignals and telemetering changes as required to simulate the occurrence of avalanches. The time synchronization client module is used to send time synchronization requests and receive time synchronization messages from the time synchronization service, verify the local time and achieve time synchronization.

[0144] The avalanche simulation configuration module is preferably a remote avalanche configuration module, which can construct a full-station interval layer device model with the full-station SCD model provided by the integrated monitoring system to be tested; it can also import the CID file of a single IED device according to the requirements of the detector. The number of IED devices participating in the avalanche can be controlled in real time, and the number of points, cycles, and times of remote signal upload of the specified device can be set.

[0145] The avalanche simulation service module is preferably a remote avalanche simulation module, which can automatically complete the simulation process of avalanche remote signaling according to the model imported by the configuration component or the configured parameters. At the same time, automatic and manual modes are provided: the automatic mode completes the simulation according to the pre-configured parameters (number of points, cycles, times), and the manual mode performs a single avalanche remote signaling simulation.

[0146] The detection workstation includes a station control layer equipment performance data analysis module and a time synchronization service module. Among them, the station control layer equipment performance data analysis module provides information entry and modification functions as well as performance parameter analysis functions. The information includes: detection party information, manufacturer information to be tested, joint adjustment substation information, system software to be tested and station control layer equipment information, performance indicators, communication parameters, etc. When using the detection workstation for the first time, it is necessary to enter the detection party information. When using this system again, it is necessary to confirm the detection party information, and the detection party information can be modified and saved. Before the detection begins, it is necessary to enter the information of the party to be tested, and the information of the party to be tested that has been tested can also be opened. The station control layer equipment performance data analysis module mainly receives information from the station control layer equipment performance acquisition module in the system to be tested, and compares and analyzes it with the pre-set relevant performance indicators to draw a detection conclusion.

[0147] The time synchronization service module receives the time synchronization request from the time synchronization client module, replies to the time synchronization message, and realizes time synchronization. Time synchronization is the basis of the advanced application detection platform of the smart substation, especially for the detection of the real-time performance data collection and alarm direct transmission of the station control layer equipment, and the real-time detection of remote browsing and file retrieval. If the system to be tested is equipped with a time synchronization device, it is not necessary to enable the time synchronization tool of the detection platform (including the above-mentioned avalanche simulation server and detection workstation).

[0148] The time synchronization tool software of the detection platform uses SNTP for time calibration, and its accuracy can meet the application of this system. In addition, the time synchronization software occupies fewer resources during operation, and compared with the load of the system under test itself, its occupied resources can be ignored.

[0149] Time synchronization tools are divided into servers and clients, such as Fig.10 and Fig.11 As shown, the time synchronization server is generally deployed at the detection workstation, and the time synchronization client is deployed at the simulation interval layer IED server (avalanche simulation server) and the station control layer equipment of the system to be tested. That is, the local time of the detection workstation is used as the reference clock to calibrate the time of other devices.

[0150] The time synchronization tool calibration process is as follows:

[0151] (1) Check that the workstation has deployed and is running the time synchronization service.

[0152] (2) The time synchronization client is deployed and run on the IED server at the simulation bay layer and the station control layer equipment of the system under test, and time synchronization requests are sent to the time synchronization service at regular intervals.

[0153] (3) The time synchronization service receives the time synchronization request and responds with a time synchronization message.

[0154] (4) The time synchronization client receives the calibration message and verifies the local time.

[0155] From the above, we can see that testing the performance indicators of the station control layer equipment under avalanche conditions can achieve the purpose of testing the performance of the station control layer. Fig.12 The test architecture of the station control layer equipment performance detection system is shown.

[0156] The station control layer equipment performance detection system belongs to an equipment performance detection subsystem in the through-type test system disclosed in the present invention. After the equipment performance detection subsystem is put into operation, it mainly includes the following processes, which are described as follows in comparison with the business data flow in the test architecture diagram:

[0157] 1) Import model files: According to actual needs, the simulation system (remote signal avalanche simulation component) can import the whole station SCD file provided by the system to be tested to simulate the bay layer IED system of the whole station, or import the CID model file specified by the user. Through model import, the online data model of the avalanche remote signal simulation system can be constructed.

[0158] 2) Configure the parameters of avalanche telesignaling: The telesignaling avalanche configuration component sets the IED devices in the bay layer participating in the avalanche telesignaling test in real time, or sets the number of telesignaling points, cycles, and times for each device. It provides automatic or manual modes to complete the telesignaling avalanche simulation.

[0159] 3) Realize the MMS communication function with the integrated monitoring system to be tested, and support the 61850 report upload mechanism of remote signaling data.

[0160] 4) During the avalanche telesignaling process, check the CPU load and network load of the station control layer hardware equipment through the data server to see if they meet the index requirements.

[0161] 5) During the avalanche telesignaling process, check whether the monitoring host's telemetry data refresh, remote control operation and other functions are normal; whether SOE and COS items are lost.

[0162] 6) During the avalanche telesignaling process, the laboratory simulated dispatching master station was used to test the relevant functions of the data communication gateway (telecontrol workstation):

[0163] Under normal circumstances, whether SOE and COS items are lost;

[0164] When switching between two machines, whether SOE and COS items are lost;

[0165] When switching between two networks, are SOE and COS items lost?

[0166] 7) Through the equipment performance test evaluation software, obtain the current configuration parameters of the avalanche telesignaling simulator (number of telesignaling points, cycles, times), avalanche telesignaling maintenance time, etc., which are used to generate the environmental conditions for the test report.

[0167] 8) Through the equipment performance test and evaluation software, the performance indicators such as the CPU load of the station control layer equipment (including the monitoring host and data server) and the network load of the security partition are collected in real time.

[0168] A crisis state is a state in which a serious electrical fault or abnormal condition occurs in a smart substation. After the initial event, a series of adverse reactions will be triggered, resulting in partial or even complete power outages. At this time, the monitoring equipment in the station will receive a large amount of data streams consisting of alarm signals, measurement values, and equipment status information. The phenomenon that the smart substation receives a large amount of alarm-related data in this crisis state is called data avalanche. In actual situations, a series of line tripping, voltage collapse, overvoltage, frequency drop, etc. caused by certain initial events will trigger data avalanche. The large amount of data that emerges at this time is called avalanche data.

[0169] The method of generating data in traditional avalanche testing is: select n measurement and control devices, each measurement and control device selects m telesignals as required, and changes the positions of m×n telesignals multiple times in a short period of time (0-3s), sending out more telesignal signals. This requires connecting the signal terminals in parallel on the measurement and control device, and then controlling the power switch to complete the on / off behavior. Then, in the monitoring background database, select the time period set for the test, check the SOE event record, and check whether the telesignal position change information record is uploaded to the station control end in sequence.

[0170] In this test system, the generation of avalanche data is completed by the avalanche simulation server. The avalanche server is a server that can simulate the operating status of the IED. By sending and receiving IEC61850 / MMS messages, the simulation system can simulate the communication behavior and response logic of the IED as an IEC61850 / MMS server, and can simulate the communication behavior and event response of the IED as a GOOSE publisher or receiver. When generating avalanche data, the substation SCD model file or the IED CID model file must be imported first. After verifying that the imported model file is correct, a standard memory database corresponding to the simulated IED is generated. According to certain rules, the data obtained by parsing the model is extracted from the signals of the MMS communication application simulation and the GOOSE communication application simulation, and a virtual application signal library is generated. At the same time, a signal mapping table reflecting the relationship between the IEC61850 data object reference and the virtual application signal ID is generated. Among them, the communication with the station control layer equipment to be tested is established through the avalanche simulation service module, which mainly realizes the signal simulation function, such as telesignaling simulation, telemetry simulation, etc. The avalanche simulation configuration module provides the test personnel with an avalanche simulation parameter configuration interface.

[0171] Parameter configuration is mainly divided into virtual IED device selection, data type, change cycle, COS number, etc. Among them,

[0172] Virtual IED device selection: refers to selecting the IED device to be simulated according to the requirements of the detection party and starting it.

[0173] Data type: refers to the type of data that changes when simulating an avalanche, including telesignaling changes, telemetering changes, and simultaneous changes in telesignaling and telemetering.

[0174] Change cycle: refers to the change cycle of telesignaling and telemetry data. The change cycle is set to be greater than or equal to 1000ms.

[0175] COS number: refers to the number of COS generated when simulating avalanche. You can choose 1000, 2000, 4000, 8000 and custom number. For example, if the COS number is 2000, since each remote signal point action and reset can generate two COS events, it is necessary for all 1000 remote signal points of all IED devices to act once and reset once. Click "Calculate COS number", the system will automatically allocate the number of calculated COS for each device according to the number of IEDs selected in the avalanche simulation parameter configuration interface and the total number of remote signals of each IED device.

[0176] After the parameter configuration is completed, the avalanche simulation system is run to generate a large amount of telesignaling and telemetry information. After the system under test receives the information transmitted by the avalanche simulation system, it generates SOE and COS items. Telesignaling and telemetry information, SOE and COS items are all avalanche data. With the above avalanche data, the performance of the station control layer equipment can be tested using the avalanche data to determine whether the information processing capacity of the station control layer equipment meets the substation operation requirements. If yes, it is determined that the performance of the station control layer equipment meets the requirements.

[0177] Before testing, preparation work needs to be done, including time synchronization settings, platform software configuration, avalanche simulation server configuration, and device performance indicator setting. Fig.10 and Fig.13 As shown, the specific test process is as follows:

[0178] (1) Start detection

[0179] Start the test, the test workstation establishes a communication connection with the avalanche simulation server and the station control layer equipment of the system to be tested, and obtains the operating data related to the performance of the station control layer equipment in real time through the station control layer equipment performance collection module.

[0180] (2) Avalanche simulation parameter configuration

[0181] In the avalanche simulation configuration module, the number of virtual IED devices participating in the avalanche test and the avalanche conditions are configured according to the requirements of the detection party.

[0182] (3) Avalanche starts

[0183] After the configuration is completed, the avalanche test can be started. After the avalanche starts, the avalanche simulation server will send a change telesignal to the system under test, and the system under test will generate SOE and COS events at the same time.

[0184] The detection workstation detects the equipment operation status under the avalanche state, and obtains and records the performance data such as the CPU load rate, network load rate, memory usage rate, etc. of the station control layer equipment in real time.

[0185] During the avalanche simulation process, the avalanche simulation can also be interrupted and canceled, thereby canceling the current detection and restarting the next detection.

[0186] (4) Ending the avalanche

[0187] After the telemetry and telesignaling data changes, the avalanche simulation server stops the avalanche simulation, and the detection workstation ends the equipment performance detection under fault conditions.

[0188] After the avalanche ends, the system under test resumes normal operation, the station control layer equipment performance collection module continues to obtain the operating data of the station control layer equipment, and the detection workstation detects the equipment performance under normal operation of the system under test.

[0189] The normal operation test can also be interrupted and ended during the normal operation test. If you need to keep the test results, you can enter the normal end test process; if you do not need to keep the test results, you can cancel the test and start the next test again.

[0190] (5) End of test

[0191] When the normal operation test reaches the set time value, the data analysis module (station control layer equipment performance analysis module) automatically ends the test, analyzes and organizes the test data and draws the test conclusion in preparation for generating and printing the test report. If the station control layer equipment is a data communication gateway, in an avalanche environment, the dual-machine switching device is used to perform the main and auxiliary switching. The data analysis module calculates the dual-machine switching time and detects whether the SOE and COS items are lost during the switching process.

[0192] (6) Print test report

[0193] After the test is completed, the data analysis module organizes and analyzes the test data, draws test conclusions and generates a test report in a standardized format. You can view the test report of the station control layer equipment performance test and support test report printing. The data analysis module has the function of reviewing and printing historical test reports. It can retrieve historical test reports based on the name of the manufacturer or substation to be tested and the test time conditions, and then review and print historical test reports.

[0194] As can be seen from the above, in this embodiment, considering that all data of the substation are concentrated in the station control layer, the station control layer equipment completes the functions of data reception, storage, processing, display and forwarding, which is the key link of the intelligent substation. Therefore, by performing performance testing on the station control layer equipment in the secondary system of the energy substation, it is ensured that the information processing capacity of the station control layer meets the substation operation requirements, which is further conducive to the safety and stable operation of the power grid.

[0195] Embodiment 2

[0196] Fig.14 The schematic diagram of the structure of the through-type test device of the secondary system of the smart substation according to the embodiment of the present disclosure is shown as follows: Fig.14 As shown, the embodiment of the present disclosure provides a through-type test device for a secondary system of a smart substation, comprising:

[0197] The injection module 10 is configured to inject the test data collected by the acquisition simulator into the merging unit to drive the secondary system to work, wherein the test data includes electromagnetic transient simulation data of the primary system;

[0198] The receiving module 20 is configured to receive switch status information of the intelligent operation box in the secondary system through a switch simulator, wherein the switch status information includes switch displacement information and switch position information;

[0199] The test module 30 is configured to perform a protection group linkage test on the secondary system according to the switch status information, wherein the protection types of the protection group linkage test include single-interval protection, hierarchical protection and multi-source information protection.

[0200] In some embodiments, the test module 30 is further configured to: test the correctness of the protection group linkage behavior according to the time data corresponding to the switch state information and the corresponding relationship between the switch state information under the same time coordinate axis;

[0201] According to the time intervals between the behaviors in the protection whole group linkage behavior, the performance index of the protection whole group linkage behavior is tested.

[0202] In some embodiments, the test module 30 is further configured to: determine the various logical links between the injection of the test data to the circuit breaker action of the protection device;

[0203] Fault detection and location are performed on the entire protection linkage behavior according to the timing relationship of each of the logical links and the switch displacement information.

[0204] In some embodiments, the through-test device further includes a test scheme determination module configured to determine a test scheme according to a protection type of the protection group linkage test.

[0205] In some embodiments, if the protection type of the protection whole group linkage test is single interval protection, the test scheme determination module is further configured as follows:

[0206] According to the type of line protection in the single bay protection, simulating the corresponding fault type through electromagnetic transient simulation;

[0207] Testing the linkage behavior of the entire protection group according to the fault type;

[0208] Among them, if the type of line protection is zero-sequence current protection, set a one-phase or two-phase instantaneous grounding fault for fault simulation, and test the entire action loop of the entire linkage behavior of the protection group; if the type of line protection is power frequency variable protection, perform fault simulation on at least one fault type among phase-to-phase short circuit, single-phase grounding, and three-phase short circuit, and check the protection action behavior under each fault type respectively.

[0209] In some embodiments, the single-interval protection includes distance protection, and the test scheme determination module is further configured to: set a fault point in the line, and test the distance measurement function of the secondary system according to the fault point.

[0210] In some embodiments, if the protection type of the protection whole group linkage test is multi-source information protection, the test data also includes current input polarity data, and the test scheme determination module is further configured as follows:

[0211] injecting the current input polarity data into the merging unit;

[0212] Checking the current input polarity according to the phase relationship between the current and voltage collected from the protection device;

[0213] If the protection type of the protection whole group linkage test is hierarchical protection, the test scheme determination module is further configured as follows:

[0214] Test the coordination and information consistency between the protections with cascade relationship in the cascade protection;

[0215] After the cascade protection fails, the protection in the same area as the protection in the cascade protection is tested.

[0216] In some embodiments, the through-test device further comprises:

[0217] A construction module configured to construct a station control layer equipment performance test system;

[0218] The testing module 30 is further configured to test the performance of the station control layer equipment in the secondary system of the smart substation through the station control layer equipment performance testing system under the data avalanche state.

[0219] In some embodiments, the through-type test device further includes a simulation mode determination module configured to:

[0220] Before simulating a primary system to obtain the test data, a simulation mode of the primary system is determined according to a test scenario, wherein the simulation mode includes an offline closed-loop mode and a real-time closed-loop mode.

[0221] The through-type test device of the secondary system of the smart substation provided in the embodiment of the present disclosure corresponds to the through-type test method of the secondary system of the smart substation in the above-mentioned embodiment. Any optional items in the embodiment of the through-type test method of the secondary system of the smart substation are also applicable to the embodiment of the through-type test device of the secondary system of the smart substation, which will not be repeated here.

[0222] Embodiment 3

[0223] An embodiment of the present disclosure also provides an electronic device, comprising at least a memory and a processor, wherein the memory stores a computer program, and the processor implements the above-mentioned through-test method for the secondary system of a smart substation when executing the computer program on the memory.

[0224] Among them, the processor that executes the computer program may be a processing device including one or more general processing devices, such as a microprocessor, a central processing unit (CPU), a graphics processing unit (GPU), etc. The memory may be a read-only memory (ROM), a random access memory (RAM), a phase change random access memory (PRAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), an electrically erasable programmable read-only memory (EEPROM), other types of random access memory (RAM), a flash disk or other forms of flash memory, a cache, a register, a static memory, a compact disk read-only memory (CD-ROM), a digital versatile disk (DVD) or other optical memory, a cassette or other magnetic storage device, or any other possible non-temporary medium used to store information or instructions that can be accessed by a computer device.

[0225] Embodiment 4

[0226] The embodiment of the present disclosure further provides a computer-readable storage medium, wherein the computer-readable medium stores a computer program, and when the computer program is executed by a processor, the through-test method of the secondary system of the smart substation is implemented.

[0227] Among them, the computer readable storage medium can adopt any combination of one or more computer readable media. The computer readable medium can be a computer readable signal medium or a computer readable storage medium. The computer program can be organized into one or more computer executable components or modules. Any number and combination of such components or modules can be used to implement various aspects of the present disclosure.

[0228] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution.

Claims

1. A through-type testing method for a secondary system of a smart substation, characterized in that: include: Injecting the test data collected by the acquisition simulator into the merging unit to drive the secondary system to work, wherein the test data includes electromagnetic transient simulation data of the primary system; Receiving switch status information of the intelligent operation box in the secondary system through a switch simulator, wherein the switch status information includes switch displacement information and switch position information; A protection group linkage test is performed on the secondary system according to the switch status information, wherein the protection types of the protection group linkage test include single-interval protection, hierarchical protection and multi-source information protection.

2. The method according to claim 1, characterized in that Performing a protection group linkage test on the secondary system according to the switch status information includes: Testing the correctness of the protection group linkage behavior according to the time data corresponding to the switch status information and the corresponding relationship of the switch status information under the same time coordinate axis; According to the time intervals between the behaviors in the protection whole group linkage behavior, the performance index of the protection whole group linkage behavior is tested.

3. The method according to claim 1, characterized in that Performing a protection group linkage test on the secondary system according to the switch status information includes: Determine the logical links between the injection of the test data and the operation of the circuit breaker of the protection device; Fault detection and location are performed on the entire protection linkage behavior according to the timing relationship of each logical link and the switch displacement information.

4. The method according to claim 2, characterized in that The method further comprises: The test scheme is determined according to the protection type of the protection group linkage test.

5. The method according to claim 4, characterized in that If the protection type of the protection group linkage test is single-interval protection, a test scheme is determined according to the protection type of the protection group linkage behavior, including: According to the type of line protection in the single bay protection, simulating the corresponding fault type through electromagnetic transient simulation; Testing the linkage behavior of the entire protection group according to the fault type; Among them, if the type of line protection is zero-sequence current protection, set a one-phase or two-phase instantaneous grounding fault for fault simulation, and test the entire action loop of the entire linkage behavior of the protection group; if the type of line protection is power frequency variable protection, perform fault simulation on at least one fault type among phase-to-phase short circuit, single-phase grounding, and three-phase short circuit, and check the protection action behavior under each fault type respectively.

6. The method according to claim 5, characterized in that The single bay protection includes distance protection, and the method further includes: A fault point is set in the line, and the distance measurement function of the secondary system is tested according to the fault point.

7. The method according to claim 4, characterized in that If the protection type of the protection group linkage test is multi-source information protection, the test data also includes current input polarity data, and a test scheme is determined according to the protection type of the protection group linkage test, including: injecting the current input polarity data into the merging unit; Checking the current input polarity according to the phase relationship between the current and voltage collected from the protection device; If the protection type of the protection group linkage test is hierarchical protection, determining a test scheme according to the protection type of the protection group linkage test includes: Test the coordination and information consistency between the protections with cascade relationship in the cascade protection; After the cascade protection fails, the protection in the same area as the protection in the cascade protection is tested.

8. The method according to claim 1, characterized in that Before simulating a primary system to obtain the test data, the method further includes: The simulation mode of the primary system is determined according to a test scenario, wherein the simulation mode includes an offline closed-loop mode and a real-time closed-loop mode.

9. The method according to claim 1, characterized in that: The method further comprises: Construct station control layer equipment performance test system; The station control layer equipment performance test system is used to test the performance of the station control layer equipment in the secondary system of the smart substation under data avalanche conditions.

10. A through-type test device for the secondary system of a smart substation, characterized in that: include: An injection module is configured to inject the test data collected by the acquisition simulator into the merging unit to drive the secondary system to work, wherein the test data includes electromagnetic transient simulation data of the primary system; A receiving module, configured to receive switch status information of the intelligent operation box in the secondary system through a switch simulator, wherein the switch status information includes switch displacement information and switch position information; The test module is configured to perform a protection group linkage test on the secondary system according to the switch status information, wherein the protection types of the protection group linkage test include single-interval protection, hierarchical protection and multi-source information protection.

Images