Method for testing centralized self-healing function of master station based on RTDS

Abstract

The invention provides a method for testing a centralized self-healing function of a master station based on an RTDS (Real Time Digital System), which tests the centralized self-healing function of the master station based on a test system constructed on the basis of the RTDS, and fully considers various test conditions and implementation modes of the various test conditions which may influence the centralized self-healing function of the master station by a multi-energy scene by utilizing the flexible modeling capability of the RTDS. The test software judges whether the centralized self-healing function of the master station meets the function requirements under the multi-energy scene or not by comparing the preset column of the information comparison table with the actual condition column, and the method has the characteristics of intuition and convenience in implementation.

Description

Technical Field

[0001] This invention relates to the technical field of power system distribution automation, and in particular to a test method for the centralized self-healing function of the master station based on RTDS. Background Technology

[0002] The centralized self-healing function of the master station is one of the functions of the self-healing technology of the distribution automation master station (referred to as the distribution master station). This centralized self-healing function of the master station uses the feeder terminal unit (FTU) to monitor the operation of the distribution network. When a feeder fault occurs, it can locate the fault in time, quickly isolate the fault, and then restore power supply to the non-faulty areas upstream and downstream of the fault point.

[0003] Distributed generation (DG) integration upgrades traditional distribution networks to active distribution networks. The direction and magnitude of short-circuit currents are influenced by the type, location, and capacity of distributed power sources, leading to a decrease in the sensitivity of existing field-controlled unit (FTU) protection, and even maloperation or failure to operate. These issues will affect the realization of the centralized self-healing function of the main station. To assess the impact of DG integration on this function, it is necessary to test it in multi-energy scenarios.

[0004] The self-healing function can be tested using the method of actual power distribution terminal and power distribution master station communication interconnection test. This method involves injecting voltage and current at the actual FTU to make the FTU send the message required for testing the self-healing technology. This method has the disadvantages of difficulty in synchronizing the injected signals of each FTU and a large workload for test personnel. Compared with the test method in the single-sided large power supply scenario, these disadvantages will be more prominent in the multi-energy scenario. Summary of the Invention

[0005] The purpose of this invention is to provide a test method for the centralized self-healing function of the master station based on RTDS, which is used to solve problems such as how to evaluate the impact of DG access on the self-healing function. It can help testers determine whether the centralized self-healing function of the master station fully possesses the feeder fault self-healing function in multi-functional scenarios.

[0006] To achieve the above objectives, this invention provides a testing method for a centralized self-healing function of a master station based on RTDS, comprising: Step S1: Build a test system for centralized self-healing function of the master station based on RTDS; Step S2: Determine the test conditions and their implementation methods; Step S3: Modify the RSCAD-based centralized simulation platform model library based on the test conditions and its implementation method, and compile the modified RSCAD-based centralized simulation platform model library to obtain the corresponding RSCAD executable file. Step S4: Use the test software to call the module to open the main station centralized simulation platform model with a specific test condition and its implementation method; Step S5: The tester fills in the DG disengagement or remote control preset column of the information lookup table with the correct FTU displacement and remote control commands executed by the self-healing technology. Step S6: Use the test software to call the executable file of the simulation platform model opened in step S4 and run the executable file; Step S7: The simulated MCD and simulated FTU wait for the general call command from the power distribution master station and send telemetry and tele-signaling information in response to their respective general calls. Step S8: Trigger a fault on the RSCAD runtime interface to connect the fault circuit; Step S9: Listen to FTU change messages and remote control messages and fill in the change position and remote control content into the DG decoupling or remote control actual situation column; Step S10: The judgment module compares the preset column with the actual column, and judges whether the self-healing function meets the preset requirements under a certain implementation mode of the test conditions based on the comparison result. Step S11: Repeat steps S4 to S10 multiple times. If the self-healing function meets the preset requirements under all implementation methods of all test conditions, then the conclusion is drawn that the self-healing function of the main station centralized simulation platform model library tested based on the test conditions and their implementation methods meets the preset requirements.

[0007] According to the present invention, a test method for the centralized self-healing function of the master station based on RTDS is provided. By changing the fault point, fault type and duration, transition resistance and DG type and penetration rate of the multi-energy scenario distribution network model, a distribution network simulation model library built on RSCAD is obtained.

[0008] According to the present invention, a test method for the centralized self-healing function of the master station based on RTDS is provided. The test conditions include DG disconnection conditions, fault information conditions, and load transfer feeder selection.

[0009] According to the present invention, a test method for the centralized self-healing function of the master station based on RTDS is provided, wherein the DG disconnection conditions include local disconnection and master station remote disconnection.

[0010] According to the present invention, a test method for the centralized self-healing function of the master station based on RTDS is provided, wherein the fault information conditions include correct fault information, missed fault reports, and false fault reports.

[0011] According to the present invention, a test method for the centralized self-healing function of the master station based on RTDS is provided, wherein the feeder switch includes a sectionalizing switch and a tie switch.

[0012] According to the present invention, a test method for a centralized self-healing function of a master station based on RTDS is provided. The functional modules include a fault triggering module, a simulated MCD, and a portion of the FTU.

[0013] The fault triggering module is used to determine the fault type and duration, and trigger the fault after the transition resistance, thereby connecting the fault circuit; the functional modules of the analog MCD and FTU are composed of 6 sub-modules, namely telemetry and signaling, remote control, outgoing line protection, reclosing, FTU current protection, and local disconnection.

[0014] The telemetry and telesignaling submodule outputs telemetry information such as RMS values ​​of voltage and current, and telesignal and position information such as various status bits; the remote control submodule receives remote control commands to open and close the switch; the outgoing line protection submodule is used to build outgoing line current protection on the simulation platform and outputs the opening command of the outgoing line circuit breaker to control the opening of the outgoing line circuit breaker; the reclosing submodule is used to output the first reclosing command of the outgoing line circuit breaker to initiate a first reclosing after the outgoing line circuit breaker is opened; the FTU current protection submodule is used to build the current protection of the FTU on the simulation platform; the local disconnection submodule is used to simulate the logic judgment of the local disconnection function. When the disconnection condition is met, it outputs the disconnection opening command to the grid-connected switch to open the grid-connected switch.

[0015] According to the test method for the centralized self-healing function of the master station based on RTDS provided by the present invention, the functional module further includes a mapping module. The mapping module is used to map telemetry, teleindication, displacement and remote control information to the corresponding IP address and location table. This module needs to set the IP address and location table of the simulated MCD and FTU.

[0016] According to the test method for the centralized self-healing function of the master station based on RTDS provided by the present invention, the number of information comparison tables is determined by the types of models in the modified centralized simulation platform model library.

[0017] According to the test method for the centralized self-healing function of the master station based on RTDS provided by the present invention, the information comparison table also includes a switch category and serial number column, a switch name and initial position column.

[0018] The technical solution of the present invention has at least the following technical effects: This invention provides a testing method for a centralized self-healing function of a master station based on RTDS. First, a test system for the centralized self-healing function of a master station based on RTDS is built, and the test conditions and simulation implementation methods under multi-energy scenarios are determined, thereby obtaining a centralized simulation platform model library for the master station with defined test conditions and implementation methods. The test software calls a module to open a centralized simulation platform model for a specific test condition and implementation method. Based on this model, testers correctly execute the required FTU displacement and remote control commands for self-healing technology and fill them into the DG disconnection or remote control preset column of the information lookup table. The executable file corresponding to the model is run, and the distribution master station collects telemetry and tele-signaling information from each feeder switch in the distribution network, then triggers a fault. For each implementation method under each test condition, the judgment module of the test software provides an information lookup table. The monitoring message module of the test software writes the messages to be monitored into the actual situation column. By comparing the preset column with the actual situation column, it can be determined whether the centralized self-healing function of the master station meets the requirements. This invention provides a test system based on RTDS to test the centralized self-healing function of the main station. By utilizing the flexible modeling capabilities of RTDS, it fully considers various test conditions and their implementation methods that may affect the centralized self-healing function of the main station in multi-functional scenarios. The test software uses a method of comparing the preset columns of the information comparison table with the actual columns to determine whether the centralized self-healing function of the main station meets the functional requirements in multi-functional scenarios. It has the characteristics of being intuitive and easy to implement. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1 This is a flowchart of the test method for the centralized self-healing function of the master station based on RTDS according to the present invention.

[0021] Figure 2 This is a structural block diagram of the test system for the centralized self-healing function of the master station based on RTDS according to the present invention.

[0022] Figure 3 This is a diagram of the power distribution network model for the multi-energy scenario of this invention.

[0023] Figure 4 This is a structural block diagram of the RSCAD simulation platform of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0027] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0028] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0029] Please see Figure 1 This invention provides a testing method for a centralized self-healing function of a master station based on RTDS, comprising: Step S1: Build a test system for centralized self-healing function of the master station based on RTDS; like Figure 2 As shown, when testing the centralized self-healing function of the master station in a multi-functional scenario, a test system based on RTDS (Real-Time Digital Simulator) is first built. This system includes RTDS, a power distribution master station, a first communication switch, a second communication switch, and a test computer, on which test software is installed. RTDS comprises RTDS hardware and RSCAD software. The RTDS hardware performs computational and interface tasks and simulates the network characteristics of MCD and FTU, including simulating various 104 message messages and their transmission and reception behavior. RSCAD is mainly used for building the simulation platform, compiling, and displaying the running process. The RTDS hardware is installed in a specially designed cabinet; RSCAD is installed on the test computer. The test software includes a calling module, a message listening module, and a judgment module.

[0030] RSCAD and RTDS hardware are connected through a first communication switch to exchange information; the power distribution master station and RTDS hardware are connected through a second communication switch to exchange information; the test software listens to FTU change messages sent by the RTDS hardware and remote control commands sent by the power distribution master station through the second communication switch.

[0031] It should be noted that RTDS is a product of the development of digital simulation technology, computer technology and parallel processing technology. It not only has the characteristics of digital simulation, but more importantly, the design of specialized hardware ensures that RTDS has the ability to perform closed-loop testing.

[0032] It should be noted that the dispatch automation system is an integrated system consisting of a master station (dispatch terminal) system, substation (plant terminal) systems and equipment, as well as corresponding data transmission channels and secondary system security protection facilities. Distribution networks are divided into high-voltage distribution networks (110-35 kV), medium-voltage distribution networks (6-20 kV), and low-voltage distribution networks (220 / 380 V). However, in the State Grid dispatch system field, it is customary to refer to dispatch automation systems whose modeling scope involves substations of 35 kV and above as master grid dispatch automation systems; systems primarily targeting the dispatch management of distribution networks of 10 kV and below are called distribution network dispatch automation systems, or simply distribution automation systems. The distribution master station is a part of the distribution network dispatch automation system.

[0033] It should be noted that the self-healing function of the distribution master station is part of the distribution automation. It is a fault handling technology that coordinates the distribution master station and FTU. It includes the functions of fault location, fault isolation and power restoration in non-faulty areas when there is a feeder fault. The centralized master station is one of the functions of the self-healing technology.

[0034] The simulation platform built by RSCAD includes a multi-energy scenario distribution network model, which includes multiple feeder switches (FS) and multiple outgoing circuit breakers (CB).

[0035] Figure 3 This is a schematic diagram of a multi-energy scenario distribution network model according to an embodiment of the present invention. CB1~CB3 are the outgoing circuit breakers of feeders 1~3, respectively. (In this invention, the monitoring and control devices and protection devices at CB are uniformly referred to as Monitoring and Control Devices (MCDs). The MCD at CB1 is represented by MCD1. MCD1 monitors the feeder voltage, current, and various states at CB1, performs outgoing line protection for the feeder, and can control CB1 to open or close. The MCDs at other CB locations are similar, totaling three.) T is a transformer, LD is a load, DG is a distributed generation source, and M is the 10 kV busbar of the substation. ~ Here is an example of a fault point. S is a sectionalizing switch, LS is a tie switch, and FS is composed of S and LS. S1 (the feeder terminal unit (FTU) at this sectionalizing switch is named FTU1. FTU1 monitors the feeder voltage, current, and various states at S1, protects the feeder, and can control S1 to open or close. Other FTUs are similar.) S2 (FTU2) is the sectionalizing switch of the main line of feeder 1. S11 (FTU11), S21 (FTU21), S22 (FTU22), S23 (FTU23), and S211 (FTU211) are the sectionalizing switches of the branch lines of feeder 1. S211 also functions as a DG grid connection switch. Other sectionalizing switches will not be described in detail here. LS1 (for ease of description, the FTU at LS1 is named FTUL1. The FTUs at other tie switches are named similarly.) LS2 (FTUL2) is a tie switch. Figure 2 In the diagram, there are 13 FTUs corresponding to FS (including 11 FTUs at S and 2 FTULs at LS), and 3 MCDs corresponding to CB. Based on Figure 2 To conduct a comprehensive test of the self-healing function of the distribution substation, a distribution network simulation model library should be built on RSCAD. The distribution network simulation model library can be obtained by changing the fault point, fault type and duration, transition resistance, DG type and penetration rate of the multi-energy scenario distribution network model.

[0036] Furthermore, such as Figure 4 As shown, the simulation platform built on RSCAD installed on the test computer includes a multi-energy scenario power distribution network model (such as...). Figure 3 (As shown) and 3 functional modules, namely the fault triggering module, the mapping module, and the simulation MCD and FTU partial functional modules. Each multi-energy scenario distribution network model, together with the above 3 functional modules, constitutes a master station centralized simulation platform model, thus obtaining the master station centralized simulation platform model library.

[0037] The fault triggering module is used to determine the fault type and duration, trigger the fault after the transition resistance, and connect the fault circuit; the mapping module is used to map telemetry, telesignaling, position change and remote control information to the corresponding IP address and location table. This module needs to set the IP address and location table of the simulated MCD and FTU; the functional modules of the simulated MCD and FTU are composed of 6 sub-modules, namely telemetry, telesignaling, remote control, MCD1 outgoing line protection, MCD1 reclosing, current protection of each FTU, and local disconnection of FTU211.

[0038] The telemetry and telesignaling submodule outputs telemetry information such as RMS values ​​of voltage and current, and telesignal and change information such as various status bits; the remote control submodule receives remote control commands to open and close the switch; the MCD1 outgoing line protection submodule is used to build outgoing line current protection on the simulation platform and outputs the CB1 opening command to control CB1 to open; the MCD1 reclosing submodule is used to output the CB1 first reclosing command to start a first reclosing after CB1 opens; the current protection submodule of each FTU is used to build the current protection of each FTU on feeder 1 on the simulation platform. In this embodiment, the local disconnection submodule is used to simulate the logic judgment of the disconnection function of FTU211. When the disconnection condition is met, it outputs a disconnection opening command to the sectionalizing switch S211, causing the sectionalizing switch S211 to open.

[0039] Step S2: Determine the test conditions and their implementation methods; Specifically, in step S2, the test conditions include DG disconnection conditions, fault information conditions, and load transfer feeder selection. DG disconnection conditions include local disconnection and master station remote disconnection. Local disconnection is always active and requires no modification to the simulation platform; master station remote disconnection depends on whether the self-healing function is available. Fault information conditions can be divided into three cases: correct fault information, missed fault reports, and false fault reports. The master station centralized fault information refers to… Figure 4 The current protection operation signals of the MCD1 outgoing line protection and the current protection of each FTU. The selection of the load transfer feeder is related to the fault point.

[0040] Specifically, the basic goal of decoupling should be to ensure that DG does not affect the implementation of various functions in the self-healing function. Considering the further goals of master station remote decoupling, such as achieving the goal of planned islanding through master station remote decoupling during the implementation of the self-healing function, this can be achieved by changing... Figure 3 The LD size, DG output, and control method of feeder 1 are used to achieve this. For ease of testing, this invention limits the main station disconnection target to the sectionalizing switch of the branch where the DG of feeder 1 is located, that is, to choose between S21 and S211. To distinguish it from local disconnection, the selection result should be S21.

[0041] Specifically, regarding fault information conditions, in a DG access scenario, in order to obtain correct fault information, Figure 4 The current protection of each FTU should be current protection with fault direction determination. The fault direction is divided into grid-side faults of the sectionalizing switch S and load-side faults (i.e., faults far from the grid side). This protection should also be able to operate reliably during short-circuit faults. The requirements are the same as for current protection when the fault information is correct, but here, to prevent missed fault information during testing, the following conditions can be met. Figure 4The mapping module does not set the IP address of the simulated MCD1 or simulated FTU upstream of a fault, that is, the fault information of the MCD1 or FTU is not sent to the distribution master station; in order to obtain the condition of false alarm of fault information in the test, the current protection of each FTU uses current protection without fault direction judgment, and the current protection of the FTU downstream of the fault point can be falsely operated.

[0042] Specifically, such as in When a permanent fault is triggered and the fault information is correct, the RTDS hardware will send current protection action messages for MCD1 and FTU1 to the distribution master station. If the fault information is missed, the current protection action message for MCD1 or FTU1 will not be sent. If the fault information is false, in addition to sending the current protection action messages for MCD1 and FTU1, the current protection action message for FTU2 will also be sent, as well as the false alarm situation of other downstream FTUs.

[0043] Specifically, Figure 3 The fault point shown on the main line of feeder 1 In the event of a permanent fault, when the self-healing function restores power to the non-faulty area downstream of the fault point, the load rate of the feeders (feeders 2 and 3) and whether there is a DG connection must be considered. To facilitate testing the impact of DG connection, in this invention, the load rates of feeders 2 and 3 are fixed to be the same. Figure 3 In accordance with the power transfer requirements, the self-healing function should designate feeder 2 as a power transfer feeder, meaning that LS1 should be closed during the power restoration phase; fault point In the event of a permanent fault, feeder 2 becomes a transfer feeder; fault point , , In the event of a permanent failure, there is no need to consider the feeder.

[0044] Specifically, after determining whether feeder 2 is a transfer feeder or not, for each fault point, the DG disconnection conditions and fault information conditions are combined. It can be seen that there are six test condition combinations for each fault point, and each test condition has one or more implementation methods.

[0045] Step S3: Modify the RSCAD-based centralized simulation platform model library based on the test conditions and its implementation method, and compile the modified RSCAD-based centralized simulation platform model library to obtain the corresponding RSCAD executable file. Specifically, in step S1, the centralized simulation platform model library of the main station is obtained. In step S2, six test conditions and their implementation methods for each fault point are determined. In this step, each centralized simulation platform model of the main station in step S1 is modified according to the requirements of step S2 to obtain the centralized simulation platform model library of the main station with determined test conditions and their implementation methods. Each model in the library is compiled to obtain the corresponding RSCAD executable file.

[0046] Step S4: Use the test software to call the module to open the main station centralized simulation platform model with a specific test condition and its implementation method; Specifically, in this embodiment, step S4 uses the testing software's calling module to select and open the main station centralized simulation platform model library obtained in step S3, which contains the determined test conditions and their implementation methods. A simulation platform model for local disconnection of point-triggered permanent faults with correct fault information.

[0047] Step S5: The tester fills in the DG disengagement or remote control preset column of the information lookup table with the correct FTU displacement and remote control commands executed by the self-healing technology. Specifically, based on the test conditions in step S2, for each test condition, one or more information lookup tables can be provided in the judgment module of the test software according to the type of implementation. For example, if there are multiple implementations of fault information omission and false alarm, multiple information lookup tables can also be provided. The information lookup table provides columns for switch category and serial number, switch name and initial position, DG deactivation or remote control preset, and DG deactivation or remote control actual situation.

[0048] Specifically, in this embodiment, There is only one way to achieve the test condition that the DG is disconnected locally and the fault information is complete during a permanent phase-to-phase short-circuit fault. Table 1 provides an information comparison table for this test condition. Specifically, as shown in Table 1, the initial position column is filled in by the tester after confirming the position of each switch in the multi-energy scenario distribution network model in the simulation platform model opened in step S4. This table provides... Figure 3 The initial normal operating positions (closed or open, denoted by 1 for the former and 0 for the latter) of the 3 outgoing circuit breakers and 13 feeder switches show that the outgoing circuit breakers and sectionalizing switches are all in the closed position, while the tie switches are all in the open position.

[0049] Specifically, as shown in Table 1, the DG disconnection or remote control preset column should indicate the positions of each switch after the self-healing process ends, which should meet the self-healing function requirements, and should be filled in by the tester. When a permanent phase-to-phase short-circuit fault is triggered, the MCD1 outgoing line protection trips CB1, and the DG local disconnection function of FTU211 trips S211 (the remote disconnection function is not enabled). After the self-healing function of the distribution master station locates the fault, it should remotely disconnect S1 and S2 adjacent to the fault point upstream and downstream. To restore power supply to the non-faulty areas upstream and downstream of the fault point, it should remotely close CB1 and LS1. After the self-healing function ends, as shown in the preset column of Table 1, the positions of S211, S1, and S2 are 0, and the positions of CB1 and LS1 are 1. Other values ​​that did not change during the self-healing process do not need to be filled in.

[0050] Specifically, the initial position column and preset column are saved for use in the next test when the fault type and duration, transition resistance or DG type and permeability are changed under the same test conditions.

[0051] Fault point The information table for other test conditions during permanent phase-to-phase short-circuit faults will not be repeated here.

[0052] Step S6: Use the test software to call the executable file of the simulation platform model opened in step S4 and run the executable file; Specifically, the test software calls the executable file of the simulation platform model opened in step S4 and clicks the run button on the RSCAD RUNTIME interface to run the executable file.

[0053] Step S7: The simulated MCD and simulated FTU wait for the general call command from the power distribution master station and send telemetry and tele-signaling information in response to their respective general calls. Specifically, Figure 2 The distribution master station will send a general call command to each MCD and each FTU simulated by RTDS. After receiving the command, the latter will send telemetry and teleindication information to the former. The former collects telemetry and teleindication information of all MCDs and FTUs in the distribution network.

[0054] Step S8: Trigger a fault on the RSCAD runtime interface to connect the fault circuit; Specifically, a fault is triggered on the RSCAD RUNTIME interface to connect the fault loop.

[0055] Step S9: Listen to FTU change messages and remote control messages and fill in the change position and remote control content into the DG decoupling or remote control actual situation column; Specifically, after a permanent short-circuit fault occurs in the distribution network, the MCD1 outgoing protection of feeder 1 will operate. When the centralized self-healing function of the main station is adopted, the outgoing circuit breaker CB1 will be tripped. After receiving the change information of the MCD1 outgoing protection operation and the tripping of CB1, the distribution main station will start the centralized self-healing function of the main station.

[0056] Specifically, the test software's message listening module also needs to be filled in. Figure 3 The IP addresses of the corresponding FTUs of the tie switches LS1 and LS2 and each section switch of feeder 1, as well as the location table of telemetry, telesignaling and remote control data.

[0057] Specifically, in this embodiment, for the test conditions in Table 1, if the local disconnection and self-healing technology meet the requirements, and the test software's monitoring message module detects the S211 disconnection and tripping change message issued by the simulated FTU211 of the RTDS hardware, the remote control S1 and S2 tripping messages of the self-healing technology of the distribution master station to achieve fault isolation, and the remote control CB1 and LS1 closing messages to restore power supply to the non-faulty area, the S211 tripping position of the FTU211 change message and the remote control position from the remote control command of the distribution master station should be filled into the DG disconnection or remote control actual situation column in Table 1.

[0058] Step S10: The judgment module compares the preset column with the actual column, and judges whether the self-healing function meets the preset requirements under a certain implementation mode of the test conditions based on the comparison result. Specifically, in this embodiment, the judgment module of the test software compares the actual DG disconnection or remote control situation column in Table 1 with the preset DG disconnection or remote control column. If the comparison results are consistent, it can be concluded that the centralized self-healing function of the main station meets the preset requirements under the test conditions and implementation methods in Table 1.

[0059] Step S11: Repeat steps S4 to S10 multiple times. If the self-healing function meets the preset requirements under all implementation methods of all test conditions, then the conclusion is drawn that the self-healing function of the main station centralized simulation platform model library tested based on the test conditions and their implementation methods meets the preset requirements.

[0060] Specifically, in the model library obtained in step S3, select other models besides the test conditions and implementation methods in Table 1, and execute steps from S4 to S10 respectively. If the conclusion that the self-healing technology meets the preset requirements is obtained in step S10, then it can be concluded that the test of the main station centralized self-healing function based on the determined test conditions and implementation methods of the present invention in the main station centralized simulation platform model library meets the preset requirements.

[0061] The above embodiments only illustrate one implementation of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that for those skilled in the art, without departing from the concept of the present invention, if the objectives of remote disconnection of the distribution master station may differ, or the limiting conditions for feeder load transfer may differ, the centralized simulation platform model of the master station can be modified according to the actual situation to achieve the testing purpose, while other steps are still implemented according to the aforementioned steps.

[0062] In summary, the testing method for centralized self-healing function of the master station based on RTDS provided by this invention has the following advantages: 1. Using RSCAD to build a multi-energy scenario distribution network model, it is easy to change the fault point, fault type and duration, transition resistance, DG type and penetration rate, thereby obtaining a test model library that closely resembles the field.

[0063] 2. The test conditions and their implementation methods fully consider the changes in on-site conditions and reflect them in the simulation platform model library.

[0064] 3. Utilizing RSCAD's ability to easily modify test conditions and its implementation methods facilitates testing of the main station's centralized self-healing function's measures to cope with multi-functional scenarios.

[0065] 4. Build MCD1 outgoing line protection, current protection for each FTU, MCD1 reclosing, and FTU211 local disconnection logic on the simulation platform. RTDS can be used to better reflect the coordination between these four parts and the centralized self-healing function of the main station in the field.

[0066] 5. The testing software uses a comparison of preset columns and actual situation columns in the information comparison table to determine whether the centralized self-healing function of the main station meets the functional requirements of multi-functional scenarios. It is intuitive and easy to implement. 6. The testing system is a closed-loop testing system, which facilitates the analysis of various problems that occur during testing.

[0067] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. It should be understood that the invention is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0068] Those skilled in the art will recognize that the units of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application of the technical solution and the constraints involved. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of the invention.

[0069] In the embodiments provided by the present invention, it should be understood that the division of units is only a logical functional division. In actual implementation, there may be other division methods, such as multiple units can be combined into one unit, one unit can be split into multiple units, or some features can be ignored.

[0070] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0071] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A test method for centralized self-healing function of a master station based on RTDS, characterized in that, The method includes: Step S1: Build a test system for centralized self-healing function of the master station based on RTDS; Step S2: Determine the test conditions and their implementation methods; Step S3: Modify the RSCAD-based centralized simulation platform model library based on the test conditions and its implementation method, and compile the modified RSCAD-based centralized simulation platform model library to obtain the corresponding RSCAD executable file. Step S4: Use the test software to call the module to open the main station centralized simulation platform model with a specific test condition and its implementation method; Step S5: The tester fills in the DG disengagement or remote control preset column of the information lookup table with the correct FTU displacement and remote control commands executed by the self-healing technology. Step S6: Use the test software to call the executable file of the simulation platform model opened in step S4 and run the executable file; Step S7: The simulated MCD and simulated FTU wait for the general call command from the power distribution master station and send telemetry and tele-signaling information in response to their respective general calls. Step S8: Trigger a fault on the RSCAD runtime interface to connect the fault circuit; Step S9: Listen to FTU change messages and remote control messages and fill in the change position and remote control content into the DG decoupling or remote control actual situation column; Step S10: The judgment module compares the preset column with the actual column, and judges whether the self-healing function meets the preset requirements under a certain implementation mode of the test conditions based on the comparison result. Step S11: Repeat steps S4 to S10 multiple times. If the self-healing function meets the preset requirements under all implementation methods of all test conditions, then the conclusion is drawn that the self-healing function of the main station centralized simulation platform model library tested based on the test conditions and their implementation methods meets the preset requirements.

2. The test method for the centralized self-healing function of the master station based on RTDS according to claim 1, characterized in that, By changing the fault point, fault type and duration, transition resistance, and DG type and penetration rate of the multi-energy scenario distribution network model, a distribution network simulation model library built on RSCAD is obtained.

3. The test method for the centralized self-healing function of the master station based on RTDS according to claim 2, characterized in that, The test conditions include DG disconnection conditions, fault information conditions, and load transfer feeder selection.

4. The test method for the centralized self-healing function of the master station based on RTDS according to claim 3, characterized in that, The DG disconnection conditions include local disconnection and remote disconnection via master station.

5. The test method for the centralized self-healing function of the master station based on RTDS according to claim 3, characterized in that, The fault information conditions include whether the fault information is correct, missed, or false.

6. The test method for the centralized self-healing function of the master station based on RTDS according to claim 1, characterized in that, Feeder switches include sectionalizing switches and tie switches.

7. The test method for the centralized self-healing function of the master station based on RTDS according to claim 6, characterized in that, The functional modules include a fault triggering module, and some functional modules of the analog MCD and FTU; The fault triggering module is used to determine the fault type and duration, and trigger the fault after the transition resistance, thereby connecting the fault circuit; the functional modules of the analog MCD and FTU are composed of 6 sub-modules, namely telemetry and signaling, remote control, outgoing line protection, reclosing, FTU current protection, and local disconnection; The telemetry and telesignaling submodule outputs telemetry information such as effective values ​​of voltage and current, and telesignal and change information such as various status positions; the remote control submodule receives remote control commands to open and close the switch; the outgoing line protection submodule is used to build outgoing line current protection on the simulation platform and outputs the opening command of the outgoing line circuit breaker to control the opening of the outgoing line circuit breaker; the reclosing submodule is used to output the first reclosing command of the outgoing line circuit breaker to initiate a first reclosing after the outgoing line circuit breaker is opened; the FTU current protection submodule is used to build the current protection of the FTU on the simulation platform; the local disconnection submodule is used to simulate the logic judgment of the local disconnection function. When the disconnection condition is met, it outputs a disconnection opening command to the grid-connected switch to open the grid-connected switch.

8. The test method for the centralized self-healing function of the master station based on RTDS according to claim 7, characterized in that, The functional module also includes a mapping module, which is used to map telemetry, teleindication, displacement and remote control information to corresponding IP addresses and location tables. This module needs to set the IP addresses and location tables of the analog MCD and FTU.

9. The test method for the centralized self-healing function of the master station based on RTDS according to claim 1, characterized in that, The number of information lookup tables depends on the types of models in the modified main station centralized simulation platform model library.

10. The test method for the centralized self-healing function of the master station based on RTDS according to claim 1, characterized in that, The information lookup table also includes columns for switch categories and serial numbers, and columns for switch names and initial positions.

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