Self-healing test system for intelligent distributed power distribution terminal

Abstract

The invention relates to a self-healing test system for an intelligent distributed power distribution terminal. The system comprises an upper computer control system; the simulation machine comprises a power distribution network model and a plurality of simulated virtual terminal models, and the virtual terminal models process output data of the power distribution network model under different fault data and output first digital quantity signals; the signal conversion module is used for receiving the digital quantity signal generated by the virtual terminal model, converting the digital quantity signal into a GOOSE signal, sending the GOOSE signal to the to-be-tested terminal, receiving the GOOSE signal fed back by the to-be-tested terminal, converting the GOOSE signal into a digital quantity signal, and sending the digital quantity signal to the simulation machine; and the to-be-tested terminal receives the data and the GOOSE signal output by the power distribution network model, feeds back the GOOSE signal to the signal conversion module, and feeds back the digital quantity signal to the simulation machine. The simulation machine is used for simulating a multi-virtual terminal model and signal interaction, the signal conversion module is combined to achieve conversion between GOOSE signals and signals between the virtual terminals, rapid communication and cooperative control among the multiple terminals are achieved, and simulation output time precision is high.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of smart grid, and particularly relates to a self-healing test system for a smart distributed power distribution terminal. BACKGROUND

[0002] In order to improve the power supply reliability of a power distribution network, a smart distributed power distribution terminal is installed on a power distribution line by a power company, which collects electrical quantity data on a switch and digital quantity information of adjacent terminals, monitors fault information on the line in real time, controls the switch to operate according to a self-healing strategy, so as to realize fast isolation of a fault in the power distribution network and positioning of a fault in the whole line.

[0003] A large amount of tests need to be performed on the smart distributed power distribution terminal before it is put into operation, to verify whether functions of the terminal such as fault positioning, fault isolation and fault recovery are correct. A large number of personnel need to be invested, and the personnel are required to have high professional knowledge. In addition, there are certain defects in the smartness, automation and self-healing logic of terminals of various manufacturers, and a large amount of time is consumed in the tests. Especially, with the connection of power electronic devices such as distributed power sources with random fluctuations and automobile charging piles to the power distribution network, it is difficult to simulate various millisecond fault conditions in the process of dynamic simulation model of the self-healing test. SUMMARY

[0004] The present application aims to overcome the problems in the prior art, and provides a self-healing test system for a smart distributed power distribution terminal, which can effectively verify the feasibility and robustness of a distributed self-healing control strategy, can reduce the professional requirements of test personnel, shorten the test time, reduce the test cost, improve the self-healing test efficiency, and guarantee the power supply reliability of the power distribution network. In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions: A self-healing test system for a smart distributed power distribution terminal, the system comprising: a host computer control system for configuring model data and fault data, and interacting with a simulation machine; a simulation machine comprising a power distribution network model and a plurality of simulated virtual terminal models, the virtual terminal models processing analog quantity and digital quantity data output by the power distribution network model under different fault data, and outputting first digital quantity signals through a control bus; a signal conversion module receiving the first digital quantity signals generated by the virtual terminal models, converting the first digital quantity signals into first GOOSE signals and sending the first GOOSE signals to a terminal to be tested, and receiving second GOOSE signals fed back by the terminal to be tested, converting the second GOOSE signals into second digital quantity signals and sending the second digital quantity signals to the simulation machine; the terminal to be tested receiving the analog quantity and digital quantity data output by the power distribution network model and the first GOOSE signals sent by the signal conversion module, feeding back the second GOOSE signals to the signal conversion module, and feeding back third digital quantity signals to the simulation machine.

[0005] In some embodiments of the present application, the host computer control system comprises a model conversion module; The model conversion module converts the power distribution network model and the virtual terminal model constructed by the host computer control system into language code executable by the simulator, and downloads the language code to the simulator; The digital input and output signals of the power distribution network model and the virtual terminal model are mapped to the digital input and output signals of the simulator; and the analog output signal of the power distribution network model is mapped to the analog channel of the simulator.

[0006] In some embodiments of the present application, the virtual terminal models interact with each other through a control bus.

[0007] In some embodiments of the present application, the virtual terminal model is configured with multiple digital output interfaces; The signal conversion module is configured with multiple channel input and output interfaces, and the channel interfaces correspond one-to-one to the digital output interfaces of the virtual terminal model.

[0008] In some embodiments of the present application, the signal conversion module is configured with association information between each input and output interface and the corresponding GOOSE signal; After receiving the first digital signal, the signal conversion module converts the first digital signal into a GOOSE signal associated with the interface output by the first digital signal based on the configured association information, and sends it to the terminal under test; at the same time, the GOOSE signal feedback by the terminal under test is received, converted into a digital signal through the configured association information, and returned to the simulator from the corresponding interface.

[0009] In some embodiments of the present application, the signal conversion module is configured with a parsing unit, which parses the substation configuration file to obtain the process layer GOOSE information of the terminal under test, and parses the required GOOSE signal from the process layer GOOSE information.

[0010] In some embodiments of the present application, the digital input and output ends of the terminal under test and the simulator are connected through a relay; The relay is used to adapt the electrical characteristics of the digital input and output interfaces of the simulator and the terminal under test.

[0011] In some embodiments of the present application, the analog output end of the simulator is connected to a power amplifier, and the analog data is input to the terminal under test after being processed by the power amplifier.

[0012] In some embodiments of the application, the host computer control system is configured with self-healing logic modeling; the terminal to be tested is connected to the simulator or signal conversion module based on the modeling information.

[0013] In some embodiments of the application, the host computer control system determines the test result by presetting the action information of the terminal to be tested: if the switch action of the terminal to be tested is correct and the action is within the preset action time error range, it is judged as qualified, The application has the following beneficial effects: (1) The application uses a simulator to simulate multiple virtual terminal models and signal interaction, and combines a signal conversion module to realize GOOSE (General Object Oriented Substation Event) signal conversion with the digital output signal of the virtual terminal, realize fast communication between multiple terminals and in-out collaborative control, and the simulation output time precision can reach 1 millisecond.

[0014] (2) The system of the application uses relays and power amplifiers to ensure signal adaptive transmission, meet the test requirements of different types of signal conversion modules, and has good compatibility and expansibility.

[0015] (3) The application uses virtual-real integrated simulation mode to build a test environment close to the actual operation scene, combines virtual terminal simulation with actual device testing, covers the full life cycle testing requirements of the device, has dynamic process simulation of intelligent distributed self-healing logic, and can verify the self-healing function of a single or whole line intelligent power distribution terminal. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the system architecture diagram of the application.

[0017] Figure 2 is the flowchart of the test process executed by the system of the application. DETAILED DESCRIPTION

[0018] The technical solutions of the application will be further described below in combination with the description of the drawings and specific embodiments. EMBODIMENT

[0019] The intelligent distributed self-healing test system of the embodiment takes a simulator as the core and builds a test environment with multiple device collaboration and multiple signal interaction. The system covers a simulator, a signal conversion module, a terminal to be tested, relays, power amplifiers, and a host computer control system (the host computer control system is configured with a function management module, including model management, case management, test management, process monitoring, result management, and fault setting), forms a complete test closed loop, and realizes precise testing and verification of the signal conversion module and the self-healing function of the terminal to be tested.

[0020] The system architecture of the application is as follows: Figure 1As shown, its module composition is as follows: (I) simulator As the core of system signal processing and logic control operation, it contains high-performance CPU, digital input and output module, analog input and output module and state register. The CPU is responsible for real-time running of power system model and calculation of current analog and digital state, and is connected with actual physical equipment through digital input and output and analog output interface. It has 1 to n virtual terminals built-in, which are simulated terminal models. In implementation, the terminal model is constructed by the host computer control system, which is converted into programming language executable by the simulator and downloaded to the simulator by the host computer control system. The model input / output and the digital / analog input / output of the simulator are associated through mapping. The number of virtual terminals is determined according to the measured line, the position of the terminal to be measured and the self-healing logic of the terminal to be measured. The virtual terminals interact through internal information bus to realize real-time state cooperation. The digital signals generated by the virtual terminals are distributed to the digital output interface through the control bus; at the same time, the digital signals output by the signal conversion module are received by the digital input interface to form a closed loop.

[0021] The analog output interface outputs continuous and discrete analog signals according to the test requirements, providing diversified excitation sources for the terminal to be measured. The simulator runs in a loop execution mode, with the output resolution required by distributed FA test being 1 ms at the minimum. One loop execution cycle is divided into three stages, namely digital and analog input sampling, fault simulation program execution and digital and analog output execution. The input sampling reads the values of each input interface and stores them in the register. The program execution stage executes the user program in sequence. The output execution stage refreshes the digital signals calculated by the program to the actual output device one by one. After the output execution stage, the CPU enters the next scanning cycle and repeats the above actions until the user ends.

[0022] (II) signal conversion module The signal conversion module is configured with the association information of the digital output interface of each virtual terminal and the corresponding GOOSE signal. In this embodiment, each terminal has 4 GOOSE signals, namely node fault, fault isolation success, switch refusal and overcurrent lockout. The signal conversion module is configured with 4 channels of 1 input module and 1 output module, which correspond to the reception and transmission of 4 GOOSE messages respectively. Four digital points are allocated as the communication requirements of virtual terminals and real terminals. The association information is as follows: No. 1 input point is associated with node fault GOOSE message, No. 2 input point is associated with fault isolation success GOOSE message, No. 3 input point is associated with switch refusal GOOSE message, and No. 4 input point is associated with overcurrent lockout GOOSE message.

[0023] The signal conversion module receives digital quantity instructions generated by the simulator (through a virtual terminal), converts them into GOOSE messages through the configuration information described above, and sends them to the terminal to be tested, while receiving the GOOSE messages fed back by the terminal to be tested, and analyzing the operation instructions and state information therein. The signal conversion module provides a configuration software interface, which can read a substation configuration description (SCD) file or a CID file, interpret the process layer GOOSE information of the terminal to be tested in the file, then associate the GOOSE signals with the input and output interfaces of the signal conversion module through the association information, and return them to the simulator through the corresponding interfaces. Based on the one-to-one correspondence between the channel interfaces and the digital quantity output interfaces of the virtual terminal, the four kinds of GOOSE messages correspond to the input and output interfaces 1-4 of the virtual terminal 1, the input and output interfaces 5-8 of the virtual terminal 2, and so on.

[0024] (Three) power amplifier The simulator analog quantity output accesses the power amplifier, amplifies the amplitudes and powers of analog signals such as voltage and current, and meets the range requirements of the analog excitation signals of the terminal to be tested, accurately simulating the actual operating conditions.

[0025] (Four) relay The relay is used to adapt the electrical characteristics of the digital input interface of the terminal to be tested, and to realize the adaptation of the digital quantity interface between the simulator and the terminal to be tested. The digital quantity input and output of the simulator is a small signal source, and the digital quantity of the terminal to be tested has several types, such as passive, direct current source and alternating current source. According to the type of the digital quantity interface of the terminal to be tested, the corresponding relay is configured; the relay amplifies the power of the digital quantity signal and converts the logic, ensuring that the signal can adapt to the input requirements of the terminal to be tested, and realizing the reliable transmission of the digital control signal. At the same time, the state feedback signal of the terminal to be tested is returned to the digital quantity input interface of the simulator through the relay, completing the closed-loop test of the digital quantity signal.

[0026] (Five) host computer control system The host computer control system is used to configure model data and fault data, and interacts with the simulator. The model management software is installed in the system, which supports the setting of test cases, including: starting test, result viewing, waveform viewing and other functions. The fault handling process can be monitored in real time, and the configuration of fault location, fault type, fault time and transition resistance is supported. The test system and the simulator interact through TCP.

[0027] The system described in the application executes a test process based on the following flow, as shown in Figure 2 , including: 1, Determine the information of the measured line and the terminal to be measured. Draw the main wiring diagram on the host computer control system according to the line information, including distributed power supply, switch, load and other information, and the rated voltage, rated current, line topology structure and other information of the terminal to be measured, and the information of each electronic component. Draw the wiring diagram, fill in the switch parameter table of the picture, and save the measured line and terminal information and the line topology diagram into a model file that can be recognized by the simulator.

[0028] 2, Define the input and output interface of the simulator. Intelligent distributed terminal is based on the principle of peer-to-peer communication, each terminal only communicates with adjacent terminal through GOOSE, based on the simulation ability of the simulator, according to the principle of maximum simulation 12 terminals, each terminal has 4 GOOSE signals, which are: node fault, fault isolation success, switch refusal jump, overcurrent lock, 4 digital points are allocated as virtual terminal and real terminal communication requirements, when the digital quantity collected by the signal conversion module changes, the corresponding GOOSE signal message is matched, 4 channel 1 input module and 1 output module are selected, which correspond to the reception and sending of 4 GOOSE messages.

[0029] 3, According to the information of the measured line and the protection logic of the terminal to be measured, self-healing logic modeling is carried out in the host computer control system, simulink modeling software is opened, line information is drawn, terminal protection logic is combined for modeling and programming, related fault information is set on the line node, such as "A phase fault, B phase fault, C phase fault, zero sequence fault, ABC phase fault" and so on, and fault recovery logic is written.

[0030] 4, Through the model conversion module of the host computer control system, the model of the modeling software is changed into C language code and downloaded to the simulator through the network, the signal input and output of the model are automatically mapped to the digital input and output of the simulator, and the analog output is automatically mapped to the analog channel of the simulator.

[0031] 5, After the test personnel manually complete the electrical quantity wiring of the whole system according to the modeling requirements, click "start test" button on the system, the program automatically jumps to the monitoring interface, which can view the analog and digital information of the terminal to be measured in the whole self-healing process.

[0032] 6、The simulator outputs real-time digital and analog quantities according to the modeling information, and the output step is 1 millisecond. In a step cycle, the entire simulation output value is calculated according to the current real-time information, and then the analog quantity is output to the power amplifier, which performs adaptive amplification output according to the rated voltage and current value of the terminal. The digital quantity output by the simulator is switched to the terminal to be tested through the relay. The digital quantity signal output by the virtual terminal is sent to the signal conversion module, which sends it to the terminal to be tested in the form of "node fault GOOSE message" according to the configuration information of the signal conversion module, "fault isolation success GOOSE message" according to the configuration information of the signal conversion module, "switch refusal to trip GOOSE message" according to the configuration information of the signal conversion module, and "overcurrent blocking GOOSE message" according to the configuration information of the signal conversion module. During the test, the simulator receives fault information instructions from the host computer control system in real time, changes the analog quantity output information in a step cycle after receiving the instructions, and outputs it to the terminal to be tested through the power amplifier.

[0033] 7、After the terminal to be tested senses the fault information on the line, it performs fault isolation, fault removal, and fault recovery logic actions according to its self-healing protection logic. The host computer control system receives the digital and analog quantity information of the simulator in real time through the network and displays it on the human-computer interaction interface.

[0034] 8、The host computer control system determines whether the terminal to be tested is correct by presetting the action information of the terminal to be tested, including switch opening and closing, switch action, and allowed action time error. If the switch action is correct and within the specified time, it is judged to be qualified, otherwise it is judged to be failed. The judgment logic for testing whether it is correct is as follows:

[0035] After the test is completed, the test results of the terminal to be tested can be viewed through the test result management interface of the host computer control system, and a test report can be generated.

Claims

1. A self-healing test system for intelligent distributed power distribution terminals, characterized in that, The system comprises: a host computer control system for configuring model data, fault data, and interacting with a simulation machine; the simulation machine comprises a power distribution network model and a plurality of simulated virtual terminal models, the virtual terminal models process analog and digital data output by the power distribution network model under different fault data, and output first digital signals through a control bus; a signal conversion module receives the first digital signals generated by the virtual terminal models, converts them into first GOOSE signals and sends them to the terminal under test, and receives second GOOSE signals fed back by the terminal under test, converts them into second digital signals and sends them to the simulation machine; the terminal under test receives analog and digital data output by the power distribution network model and the first GOOSE signals sent by the signal conversion module, feeds back second GOOSE signals to the signal conversion module, and feeds back third digital signals to the simulation machine.

2. The self-healing test system of claim 1, wherein, The host computer control system comprises a model conversion module; the model conversion module converts the power distribution network model and the virtual terminal model constructed by the host computer control system into language codes executable by the simulation machine, and downloads the language codes to the simulation machine; the digital input and output signals of the power distribution network model and the virtual terminal model are mapped to the digital input and output signals of the simulation machine; and the analog output signals of the power distribution network model are mapped to the analog channels of the simulation machine.

3. The self-healing test system of claim 1, wherein, The virtual terminal models interact with each other through the control bus.

4. The self-healing test system of claim 1, wherein, The virtual terminal models are configured with a plurality of digital output interfaces; the signal conversion module is configured with a plurality of channel input and output interfaces, and the channel interfaces correspond one-to-one to the digital output interfaces of the virtual terminal models.

5. The self-healing test system of claim 4, wherein, The signal conversion module is configured with association information between each input and output interface and the corresponding GOOSE signal; after receiving the first digital signals, the signal conversion module converts the first digital signals into GOOSE signals associated with the interfaces based on the configured association information, and sends them to the terminal under test; at the same time, the signal conversion module receives the GOOSE signals fed back by the terminal under test, converts them into digital signals through the configured association information, and returns them to the simulation machine from the corresponding interfaces.

6. The self-healing test system of claim 1, wherein, The signal conversion module is configured with an analysis unit, which analyzes the substation configuration file to obtain process layer GOOSE information of the terminal under test, and analyzes the required GOOSE signals from the process layer GOOSE information.

7. The self-healing test system of claim 1, wherein, The digital input and output ends of the terminal under test and the simulation machine are connected through a relay; the relay is used to adapt the electrical characteristics of the simulation machine and the digital input and output interfaces of the terminal under test.

8. The self-healing test system of claim 1, wherein, The analog output end of the simulation machine is connected to a power amplifier, and the analog data is input to the terminal under test after being processed by the power amplifier.

9. The self-healing test system of claim 1, wherein, The host computer control system is configured with self-healing logic modeling; and the terminal under test connects the digital input / output interfaces to the simulation machine or the signal conversion module based on the modeling information.

10. The self-healing test system of claim 1, wherein, The host computer control system judges the test result by preset terminal action information to be tested, and if the terminal switch action is correct and within the preset action time error range, the test result is judged as qualified.

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