Joint testing system and method for regional distribution network self-healing devices

Abstract

The embodiments of the present invention relate to the technical field of local distribution network self-healing, and disclose a combined test system and method for regional distribution network self-healing devices. The above-mentioned combined test system for regional distribution network self-healing devices includes a simulation control host and multiple simulation test terminals. Among them, the multiple simulation test terminals correspond to the multiple self-healing devices one by one. The simulation control host is communicatively connected to the multiple simulation test terminals, and the simulation test terminals are electrically connected to the corresponding self-healing devices. The simulation control host is used to establish a distribution network simulation model, interact test information with the multiple simulation test terminals, and perform test result analysis. Among them, the test information includes fault configuration information, first simulation feedback information, and second simulation feedback information. The simulation test terminal is used to interact test information with the simulation control host, convert the fault configuration information and send it to the self-healing device, receive the first simulation feedback information uploaded by the self-healing device, simulate the switch logic of the primary system of the distribution network as a simulated circuit breaker, and generate the second simulation feedback information.

Description

Technical Field

[0001] The present invention relates to the technical field of self-healing of local distribution networks, and particularly to a joint test system and method for self-healing devices of regional distribution networks. Background Art

[0002] The distribution network directly faces end-users, is an important public infrastructure for serving people's livelihood, and is also a key link for ensuring power supply quality, improving the operation efficiency of the power grid, and innovating user services. With the proposal of the dual-carbon goal and the construction of a new power system, the investment and construction of the distribution network will become the focus of the power grid investment and construction.

[0003] Currently, the construction of the distribution network is comprehensively promoting the construction of distribution automation in the direction of fault self-healing, effectively realizing the state monitoring of the distribution network, rapid fault location, and automatic fault isolation. The self-healing function of the distribution network greatly improves the power supply reliability rate of users, but the development and implementation of its function depend on the accuracy of the action logic. Facing the diverse regional distribution network structure designs and the action logic schemes developed and designed to meet the needs of different users in different regions, the action logic of the self-healing system needs to be continuously optimized and designed to meet the applications in diverse scenarios. Often, simulation tests are required for verification. Therefore, the system-level logic function test of the regional distribution network self-healing system is particularly necessary.

[0004] For the logic function test of the self-healing system, currently, the laboratory RTDS real-time digital simulation test platform is used to build a test environment in the laboratory that includes secondary equipment (such as protection devices and self-healing devices) in multiple stations of the regional distribution network, and the real-time data of the simulation system is used for fault simulation to realize its cross-station and cross-interval integrated action logic, which can effectively verify the action logic function of the self-healing system. Laboratory simulation tests can effectively test and verify before the equipment leaves the factory, but this method has strict limitations in space. After the intelligent distributed self-healing system is installed and deployed on-site, it is difficult to form a systematic joint test during the on-site test before it is officially put into operation, and the test items and test scope are limited. To verify its actual action logic, there is still a need for integrated tests. However, switch stations or distribution rooms at different locations are often hundreds of meters or even several kilometers apart. Due to the limitations of spatial distance and technical means, there is a lack of a systematic integrated closed-loop test method for the regional distribution network across stations and intervals. Summary of the Invention

[0005] In view of this, the embodiments of the present invention provide a joint test system and method for self-healing devices of regional distribution networks, which realize the cross-space integrated test of self-healing devices of regional distribution networks and improve the test efficiency.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a combined test system for a regional distribution network self-healing device, including a simulation control host and multiple simulation test terminals. Among them, the multiple simulation test terminals correspond one-to-one with multiple self-healing devices. The simulation control host is communicatively connected to the multiple simulation test terminals, and the simulation test terminals are electrically connected to the corresponding self-healing devices. The simulation control host is used to establish a distribution network simulation model, interact test information with the multiple simulation test terminals, and analyze test results. Among them, the test information includes fault configuration information, first simulation feedback information, and second simulation feedback information. The simulation test terminal is used to interact test information with the simulation control host, convert the fault configuration information and send it to the self-healing device, receive the first simulation feedback information uploaded by the self-healing device, simulate the switch logic of the primary system of the distribution network as a simulated circuit breaker and generate the second simulation feedback information.

[0008] Based on the first aspect, in some embodiments, the simulation test terminal includes a DI / DO signal interface module, a test control module, a D / A digital-to-analog conversion module, and a simulated circuit breaker module. The test control module is respectively connected to the DI / DO signal interface module, the D / A digital-to-analog conversion module, and the simulated circuit breaker module. The simulation test terminal is connected to the self-healing device. The DI / DO signal interface module is used to receive and / or send test information. The D / A digital-to-analog conversion module is used to convert the digital quantity fault configuration information sent by the simulation control host into analog quantity fault configuration information. The test control module is used to send the analog quantity fault configuration information to the self-healing device for testing and receive the first simulation feedback information uploaded by the self-healing device or the second simulation feedback information uploaded by the simulated circuit breaker module. The simulated circuit breaker module is used to simulate the switch logic of the primary system of the distribution network and generate the second simulation feedback information.

[0009] Based on the first aspect, in some embodiments, the fault configuration information includes electrical quantity information and switch quantity information. The first simulation feedback information and the second simulation feedback information include switch quantity information.

[0010] Based on the first aspect, in some embodiments, the simulation control host and the multiple simulation test terminals are communicatively connected through an EPON communication network.

[0011] Based on the first aspect, in some embodiments, the EPON communication network includes an optical line terminal OLT, an optical distribution network ODN, and multiple optical network units ONU. One end of the optical line terminal OLT is connected to the simulation control host, and the other end is respectively connected to the multiple optical network units ONU through the optical distribution network ODN. The multiple optical network units are connected to the multiple simulation test terminals one-to-one.

[0012] Based on the first aspect, in some embodiments, an optical distribution network (ODN) includes a plurality of passive optical splitters (POSs) and optical fibers. The passive optical splitter (POS) is configured to equally or unequally distribute an optical fiber signal sent by an optical line terminal (OLT) to multiple optical fibers.

[0013] Based on the first aspect, in some embodiments, the networking method of an EPON communication network includes: based on the spare cores of the existing optical fiber ring network of the distribution network, at each switch station or power distribution room, performing optical fiber fusion splicing on the optical fiber spare cores connecting its upstream and downstream station rooms, and installing a non-uniform optical splitter (POS) to implement EPON networking.

[0014] In the embodiments of the present invention, the provided joint test system for the regional distribution network self-healing device can span the temporal and spatial distances between switch stations or power distribution rooms. The simulation test terminals are installed in each actual switch station and communicate through an EPON optical communication network, meeting the requirement for real-time integrated testing of the distribution network self-healing system and improving the testing efficiency.

[0015] In a second aspect, embodiments of the present invention provide a method for jointly testing a regional distribution network self-healing device, including: the simulation control host establishes a distribution network simulation model according to the distribution network architecture and electrical information of the to-be-tested regional distribution network; the simulation control host sets fault configuration information based on the distribution network simulation model and sends the fault configuration information to the simulation test terminal; the simulation test terminal collects first simulation feedback information and second simulation feedback information and uploads them to the simulation control host; the simulation control host performs position verification according to the first simulation feedback information and the second simulation feedback information and generates a test result report.

[0016] Based on the second aspect, in some embodiments, the simulation test terminal collects first simulation feedback information and second simulation feedback information and uploads them to the simulation control host, including: the self-healing device sends the first simulation feedback information according to the fault configuration information and the self-healing logic, and the simulation test terminal receives the first simulation feedback information and uploads it to the simulation control host; the simulation test terminal receives the first simulation feedback information and acts on the analog circuit breaker module, and uploads the actual switch position state of the analog circuit breaker module as the second feedback information to the simulation control host.

[0017] Based on the second aspect, in some embodiments, the simulation control host performs position verification according to the first simulation feedback information and the second simulation feedback information, and generates a test result report, including: the simulation control host receives the first simulation feedback information and generates the position state of the analog switch according to the distribution network simulation model, performs simulation calculations according to the position state of the analog switch, the simulation control host receives the second simulation feedback information, and compares whether the switch position state in the second simulation feedback information is consistent with the position state of the analog switch. If they are consistent, continue the simulation calculation. If they are inconsistent, stop the simulation calculation and perform fault troubleshooting; or, the simulation control host receives the second simulation feedback information and performs simulation calculations, the simulation control host receives the first simulation feedback information and generates the position state of the analog switch according to the distribution network simulation model, and compares whether the switch position state in the second simulation feedback information is consistent with the position state of the analog switch. If they are consistent, continue the simulation calculation. If they are inconsistent, stop the simulation calculation and perform fault troubleshooting.

[0018] In the embodiments of the present invention, while obtaining the first simulation feedback information by using the self-healing device, the second simulation feedback information is obtained by using the analog circuit breaker. The second simulation feedback information is compared with the model calculation result of the first feedback information, and position verification is performed by comparing the consistency of the above information, which ensures the real-time performance and correctness of the simulation information transmission and ensures the normal progress of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Schematic diagram of the structure of the regional distribution network self-healing device joint test system provided by the embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the composition module of the simulation test terminal provided by the embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the EPON optical communication network architecture provided by the embodiment of the present invention;

[0023] Figure 4 Flowchart of the regional distribution network self-healing device joint test method provided by the embodiment of the present invention;

[0024] Figure 5 Flowchart of the test provided by the embodiment of the present invention;

[0025] Figure 6Flow chart of feedback information provided by an embodiment of the present invention;

[0026] Figure 7 Process diagram of simulation calculation provided by an embodiment of the present invention. Detailed implementation manners

[0027] The present invention will be described more clearly below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the function of the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made. These all belong to the protection scope of the present invention.

[0028] To make the purpose, technical solution and advantages of the present invention clearer, the following will be described through specific embodiments with reference to the accompanying drawings.

[0029] To realize the cross-space joint test of the regional distribution network self-healing device, the present invention provides a regional distribution network self-healing device joint test system.

[0030] As Figure 1 shown, the regional distribution network self-healing device joint test system includes a simulation control host and multiple simulation test terminals. Among them, multiple simulation test terminals correspond to multiple self-healing devices one by one. The simulation control host is communicatively connected to multiple simulation test terminals, and the simulation test terminals are electrically connected to the corresponding self-healing devices.

[0031] The simulation control host is used to establish a distribution network simulation model, interact test information with multiple simulation test terminals, and analyze test results. Among them, the test information includes fault configuration information, first simulation feedback information, and second simulation feedback information.

[0032] In some embodiments, the simulation control host is arranged in the switch station or distribution room at the first level, that is, the head end, and a distribution network simulation model is built through simulation software to simulate the primary part of the power system.

[0033] The simulation test terminal is used to interact test information with the simulation control host, convert the fault configuration information and send it to the self-healing device, receive the first simulation feedback information uploaded by the self-healing device, simulate the switch logic of the distribution network primary system as a simulated circuit breaker and generate the second simulation feedback information.

[0034] As Figure 2 shown, the simulation test terminal includes a DI / DO signal interface module, a test control module, a D / A digital-to-analog conversion module, and a simulated circuit breaker module. The test control module is respectively connected to the DI / DO signal interface module, the D / A digital-to-analog conversion module, and the simulated circuit breaker module. The simulation test terminal is connected to the self-healing device.

[0035] The DI / DO signal interface module is used to receive and / or send test information. The D / A digital-to-analog conversion module is used to convert the digital fault configuration information sent by the simulation control host into analog fault configuration information. The test control module is used to send the analog fault configuration information to the self-healing device for testing and receive the first simulation feedback information uploaded by the self-healing device or the second simulation feedback information uploaded by the analog circuit breaker module. The analog circuit breaker module is used to simulate the switch logic of the primary system of the distribution network and generate the second simulation feedback information.

[0036] The fault configuration information includes electrical quantity information and switch quantity information. The first simulation feedback information and the second simulation feedback information include switch quantity information.

[0037] In some embodiments, the electrical quantities (such as voltage and current) are unidirectional, from the simulation control host to the simulation test terminal; the switch quantity information is bidirectional. For example, information such as switch position, manual closing instruction, and manual tripping instruction is from the simulation control host to the simulation test terminal, while the self-healing tripping and self-healing closing instruction information is from the simulation test terminal to the simulation control host.

[0038] As Figure 3 shown, the simulation control host and multiple simulation test terminals are communicatively connected through an EPON communication network.

[0039] In some embodiments, an EPON communication network is built using the spare cores of the optical fibers in the optical fiber communication network of the self-healing system itself. The EPON communication network includes three parts: OLT (Optical Line Terminal), ONU (Optical Network Unit), and ODN (Optical Distribution Network). One end of the optical line terminal OLT is connected to the simulation control host, and the other end is respectively connected to multiple optical network units ONU through the optical distribution network ODN. Multiple optical network units ONU are connected to multiple simulation test terminals in a one-to-one correspondence.

[0040] The optical distribution network ODN includes multiple passive optical splitters POS and optical fibers. The passive optical splitter POS is used to equally or unequally distribute an optical fiber signal sent by the optical line terminal OLT to multiple optical fibers.

[0041] The networking method of the EPON communication network includes: based on the spare cores of the existing optical fiber ring network of the distribution network, at each switch station or distribution room, the spare cores of the optical fibers connecting its upstream and downstream station houses are subjected to optical fiber fusion splicing treatment, and a non-uniform optical splitter POS is installed to realize EPON networking.

[0042] In some embodiments, for the distribution network self-healing system involved in the present invention, the communication between its various self-healing devices is realized by direct fiber connection to achieve peer-to-peer communication. Therefore, the proposed test method and test system of the present invention can utilize the spare cores of the existing fiber optic ring network, and build an EPON time-division multiplexing passive optical network on this basis without adding new communication channels, reducing the investment cost. The OLT of the EPON communication network and the simulation control host are jointly arranged in the head-end switch station or distribution room. The OLT can interact with the simulation control host for data. The simulation control host first sends the fault configuration information to the OLT through the data interface of the OLT, and then the OLT connects to the station-end device ONU through the ODN network (composed of optical fibers and passive optical splitters).

[0043] The ONU is arranged at each switch station end, and one ONU is configured at each simulation test terminal, responsible for receiving the data sent by the OLT and sending it to the corresponding simulation test terminal. On the other hand, the ONU receives the first simulation feedback information and the second simulation feedback information of the test terminal, and transmits them back to the OLT through the ODN network, and uploads them to the simulation control host through data interaction. The OLT realizes the control and management functions of the station-end device ONU through the ODN.

[0044] Based on the above regional distribution network self-healing device joint test system, the present invention also provides a regional distribution network self-healing device joint test method, as Figure 4 shown, the regional distribution network self-healing device joint test method may include steps 401 to 404.

[0045] Step 401: The simulation control host establishes a power distribution network simulation model according to the power distribution network architecture and electrical information of the power distribution network to be tested.

[0046] Build a power distribution network simulation model according to the structure of the power distribution network to be tested, perform parameter configuration, and analyze the short-circuit fault setting according to the logical function test requirements.

[0047] Step 402: The simulation control host sets the fault configuration information based on the power distribution network simulation model and sends the fault configuration information to the simulation test terminal.

[0048] Step 403: The simulation test terminal collects the first simulation feedback information and the second simulation feedback information and uploads them to the simulation control host.

[0049] The self-healing device sends the first simulation feedback information according to the fault configuration information and the self-healing logic, and the simulation test terminal receives the first simulation feedback information and uploads it to the simulation control host;

[0050] The simulation test terminal receives the first simulation feedback information and acts on the simulated circuit breaker module, and uploads the actual switch position state of the simulated circuit breaker module as the second feedback information to the simulation control host.

[0051] Step 404: The simulation control host performs position verification based on the first simulation feedback information and the second simulation feedback information, and generates a test result report.

[0052] The simulation control host receives the first simulation feedback information and generates the simulated switch position status according to the distribution network simulation model, performs simulation calculations based on the simulated switch position status. The simulation control host receives the second simulation feedback information, and compares whether the switch position status in the second simulation feedback information is consistent with the simulated switch position status. If they are consistent, continue the simulation calculation; if not, stop the simulation calculation and perform fault troubleshooting.

[0053] Or, the simulation control host receives the second simulation feedback information and performs simulation calculations. The simulation control host receives the first simulation feedback information and generates the simulated switch position status according to the distribution network simulation model, and compares whether the switch position status in the second simulation feedback information is consistent with the simulated switch position status. If they are consistent, continue the simulation calculation; if not, stop the simulation calculation and perform fault troubleshooting.

[0054] Embodiment 1

[0055] Taking the distribution network with a 10kV double-loop network structure as an example, as Figure 5 shown in the figure, first, perform simulation initialization. Build a distribution network simulation model on the simulation control host according to the distribution network structure, set parameters and control modes, configure fault information according to the logical function test requirements, and configure a simulation test terminal at each of the four switch stations A, B, C, and D. Each simulation test terminal has I / O interface functions and D / A conversion functions, and can output at least 1 channel of voltage and 3 channels of current simultaneously, meeting the resource requirements of the in-loop and out-loop section interval currents and bus voltages of this station. This test terminal of the simulation test terminal has a simulated circuit breaker function module and can complete a closed-loop test with the self-healing terminal.

[0056] Configure an optical line terminal OLT, which is responsible for data interaction with the simulation control host. The simulation control host first sends the electrical quantity and switch quantity data to the OLT through the data interface of the OLT, and then the OLT connects to the station-side device ONU through the ODN network (composed of optical fibers and passive optical splitters), providing a fiber interface for the passive optical fiber network facing the test terminals distributed at each station.

[0057] One optical network unit (ONU) is configured at each of switch stations A, B, C, and D. An ODN optical distribution network is constructed using the spare cores of the existing fiber optic ring network among the four stations. At each switch station or power distribution room, the two spare fiber optic cores connecting its upstream and downstream station buildings are fused, and a non-uniform optical splitter (POS) is installed to achieve EPON networking. For the downstream data stream from the OLT to the ONU, time-division multiplexing technology is used. The electrical and switching quantities in the fault configuration information are transmitted in a broadcast manner and sent to the ONUs of the four switch stations according to the destination address information of each station's ONU based on the IEEE802.3 protocol. For the upstream data stream from the ONU to the OLT, time-division multiple access technology is used, and each ONU uses the transmission time slot to avoid transmission conflicts. After the EPON configuration is completed, check whether the channel data interaction is normal. If it is normal, start the test.

[0058] The simulation control host performs operation calculations according to the pre-set fault control logic and sends the electrical and switching quantities in the fault configuration information to the simulation test terminal. The self-healing system locates the distribution network fault, isolates the fault, and restores power supply to the non-fault area according to its action logic, and sends trip and closing commands to the corresponding simulation test terminal.

[0059] After receiving the first simulation feedback information (such as trip and closing commands) from the self-healing device under test, the simulation test terminal transmits it to the simulation control host through the EPON communication network. After receiving the trip and closing commands in the first simulation feedback information, the distribution network simulation model acts on the corresponding virtual circuit breaker in the model and performs further analysis and calculations according to the working logic of the virtual circuit breaker. The above virtual circuit breaker refers to the virtual circuit breaker model in the distribution network simulation model, which has the same working logic as the actual circuit breaker and acts accordingly after receiving the trip and closing information.

[0060] As Figure 6 shown, the first simulation feedback information sent by the self-healing device is specifically trip and closing commands (including manual trip and closing commands and self-healing trip and closing commands). The first simulation feedback information acts on both the analog circuit breaker module of the simulation test terminal and the virtual circuit breaker on the simulation control host at the same time. After the analog circuit breaker changes its position, it sends the second simulation feedback information (the switch position status of the analog circuit breaker) to the simulation control host. The distribution network simulation model on the simulation control host accesses the switch position status of the virtual circuit breaker and the switch position status of the analog circuit breaker successively during the calculation process and performs further analysis and calculations based on this.

[0061] Whether the simulation control host first receives the trip and closing commands from the self-healing device or first receives the switch position status of the analog circuit breaker, it is considered that the state has changed and is reflected in the distribution network simulation model for further analysis and calculations to output the electrical quantities of the next state.

[0062] As Figure 7As shown, after receiving the closing position information, it is judged whether the two are consistent within the delay time. In some embodiments, the step size of the simulation calculation is 83 μs. During this time period, if it is confirmed that the two are consistent, the result is considered correct and the next calculation is carried out. After receiving the first simulation feedback information, if the simulation control host receives the second simulation feedback information within the delay time, at this time, position verification is carried out, comparing the received analog circuit breaker switch position state with the switch position state of the virtual circuit breaker in the distribution network simulation model after receiving the trip and close commands of the device under test for self-healing. If the two are consistent, it does not affect the continued operation of the simulation main program, has no impact on the entire simulation calculation process, and enters a new verification process. If the two are inconsistent, it indicates that an abnormality has occurred in the communication channel information transmission, and the simulation program operation is immediately stopped to find the fault. In this way, the real-time and correctness of the simulation information transmission are realized based on the verification of the circuit breaker switch position state, ensuring the normal progress of the test.

[0063] After the simulation test is completed, according to the action situation of the self-healing device, combined with the final state of the distribution network simulation model and the state of the analog circuit breaker, the test result evaluation is carried out to realize the on-site cross-station domain integrated logic function test of the regional distribution network distributed self-healing system.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A combined test system for self-healing devices of regional distribution networks, characterized in that, The joint test system for the regional distribution network self-healing device includes a simulation control host and multiple simulation test terminals. Among them, the multiple simulation test terminals correspond to multiple self-healing devices one by one. The simulation control host is communicatively connected to the multiple simulation test terminals, and the simulation test terminals are electrically connected to the corresponding self-healing devices; The simulation control host is used to establish a distribution network simulation model, interact test information with the multiple simulation test terminals, and analyze test results. Among them, the test information includes fault configuration information, first simulation feedback information, and second simulation feedback information; The simulation test terminal is used to interact the test information with the simulation control host, convert the fault configuration information and send it to the self-healing device, receive the first simulation feedback information uploaded by the self-healing device, simulate the switch logic of the primary system of the distribution network as a simulated circuit breaker, and generate the second simulation feedback information.

2. The combined test system for self-healing devices of regional distribution networks according to claim 1, characterized in that, The simulation test terminal includes a DI / DO signal interface module, a test control module, a D / A digital-to-analog conversion module, and a simulated circuit breaker module. The test control module is respectively connected to the DI / DO signal interface module, the D / A digital-to-analog conversion module, and the simulated circuit breaker module. The simulation test terminal is connected to the self-healing device; The DI / DO signal interface module is used to receive and / or send the test information. The D / A digital-to-analog conversion module is used to convert the digital quantity fault configuration information sent by the simulation control host into analog quantity fault configuration information. The test control module is used to send the analog quantity fault configuration information to the self-healing device for testing and receive the first simulation feedback information uploaded by the self-healing device or the second simulation feedback information uploaded by the simulated circuit breaker module. The simulated circuit breaker module is used to simulate the switch logic of the primary system of the distribution network and generate the second simulation feedback information.

3. The combined test system for self-healing devices of regional distribution networks according to claim 1, characterized in that, The fault configuration information includes electrical quantity information and switch quantity information. The first simulation feedback information and the second simulation feedback information include switch quantity information.

4. The combined test system for self-healing devices of regional distribution networks according to claim 1, characterized in that, The simulation control host and the multiple simulation test terminals are communicatively connected through an EPON communication network.

5. The combined test system for self-healing devices of regional distribution networks according to claim 4, characterized in that, The EPON communication network includes an optical line terminal OLT, an optical distribution network ODN, and multiple optical network units ONU. One end of the optical line terminal OLT is connected to the simulation control host, and the other end is respectively connected to the multiple optical network units ONU through the optical distribution network ODN. The multiple optical network units are connected to the multiple simulation test terminals one by one.

6. The combined test system for self-healing devices of regional distribution networks according to claim 5, characterized in that, The optical distribution network ODN includes multiple passive optical splitters POS and optical fibers. The passive optical splitter POS is used to equally or unequally distribute a fiber optic signal sent by the optical line terminal OLT to multiple optical fibers.

7. The combined test system for self-healing devices of regional distribution networks according to claim 6, characterized in that, The networking method of the EPON communication network includes: Based on the spare core of the existing fiber optic ring network of the distribution network, in each switch station or distribution room, perform fiber fusion processing on the fiber optic spare cores connecting its upstream and downstream station houses, and install a non-uniform optical splitter POS to achieve EPON networking.

8. A combined test method for self-healing devices of regional distribution networks, characterized in that, Including: The simulation control host establishes a distribution network simulation model according to the distribution network architecture and electrical information of the area to be measured. The simulation control host sets fault configuration information based on the distribution network simulation model and sends the fault configuration information to the simulation test terminal. The simulation test terminal collects the first simulation feedback information and the second simulation feedback information and uploads them to the simulation control host. The simulation control host performs position verification based on the first simulation feedback information and the second simulation feedback information and generates a test result report. Among them, the simulation test terminal collects the first simulation feedback information and the second simulation feedback information and uploads them to the simulation control host, including: The self-healing device issues the first simulation feedback information according to the fault configuration information and the self-healing logic, and the simulation test terminal receives the first simulation feedback information and uploads it to the simulation control host. The simulation test terminal receives the first simulation feedback information and acts on the analog circuit breaker module, and uploads the actual switch position state of the analog circuit breaker module as the second simulation feedback information to the simulation control host. The simulation control host performs position verification based on the first simulation feedback information and the second simulation feedback information and generates a test result report, including: The simulation control host receives the first simulation feedback information and generates an analog switch position state according to the distribution network simulation model, performs simulation calculations according to the analog switch position state, the simulation control host receives the second simulation feedback information, and compares whether the switch position state in the second simulation feedback information is consistent with the analog switch position state. If they are consistent, continue the simulation calculation. If they are inconsistent, stop the simulation calculation and perform fault troubleshooting. Or, the simulation control host receives the second simulation feedback information and performs simulation calculations. The simulation control host receives the first simulation feedback information and generates an analog switch position state according to the distribution network simulation model, and compares whether the switch position state in the second simulation feedback information is consistent with the analog switch position state. If they are consistent, continue the simulation calculation. If they are inconsistent, stop the simulation calculation and perform fault troubleshooting.

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