On-site detection device for control board in flexible DC transmission converter valve submodule

Abstract

The present invention provides a field detection device for a control board in a flexible direct current transmission converter valve submodule, comprising a test box and a host computer. The upper surface of the test box is a monitoring layer, and the inside of the box is separated into a test tooling layer, a test excitation and recording layer, and a power supply layer by a plurality of partitions. The test tooling layer provides installation fixtures and test tooling interfaces for all boards under test. The test excitation and recording layer is installed with a test excitation board, which is downwardly connected to the test tooling interface of the test tooling layer, and is connected to the board under test through the test tooling interface. The test process is fully controlled according to the host computer instructions, and all control data and feedback data generated in the test are recorded, and the recorded data is transmitted to the host computer for subsequent data analysis. In view of the functional characteristics of various control boards in the converter valve submodule, the work efficiency of detection and maintenance is improved through the design of the test tooling layer and the test excitation and recording layer.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible direct current power transmission, and in particular to an on-site detection device for a control board card in a flexible direct current power transmission converter valve submodule. Background Art

[0002] Flexible DC transmission technology is also called VSC-HVDC technology. In the modular multi-level flexible DC transmission system, the converter valve is the core equipment of the DC transmission system. The smallest unit of the converter valve is the converter valve submodule. The number of submodules in the converter station varies with the capacity and voltage level of the converter station. When the capacity of the converter station reaches more than 1000MW, the number of submodules usually reaches several thousand. In addition to primary equipment such as IGBT, capacitor, bypass contactor, and protection thyristor, the main components of the submodule include numerous local control boards, such as unit main control board, IGBT driver board, thyristor driver board, etc.

[0003] In the current flexible DC transmission projects, submodules are prone to failure. Compared with the primary equipment in the submodule, submodule failures caused by failures of the submodule control board itself account for more than 80% of submodule failures. Currently, there is no device or method for quickly locating the faulty submodule secondary board in the field operation and maintenance equipment, which affects the efficiency of detection and maintenance. Summary of the invention

[0004] In order to solve the technical problems raised by the background technology, the present invention provides an on-site detection device for a control board in a flexible DC transmission converter valve submodule. According to the functional characteristics of various control boards in the converter valve submodule, the efficiency of detection and maintenance is improved through the design of a test tooling layer and a test excitation and recording layer.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A field detection device for a control board in a flexible direct current transmission converter valve submodule comprises a test box and a host computer.

[0007] The test box comprises a plurality of layers, the upper surface of the test box is a monitoring layer, and the inside of the box is separated into a test tooling layer, a test excitation and recording layer, and a power supply layer by a plurality of partitions.

[0008] The test tooling layer provides installation fixtures and test tooling interfaces for all boards under test.

[0009] The test excitation and recording layer is installed with a test excitation board. The test excitation board is connected to the test tooling interface of the test tooling layer downward, and is connected to the board under test through the test tooling interface, and is connected to the host computer upward. It comprehensively controls the test process according to the instructions of the host computer, records all control data and feedback data generated in the test, and transmits the recorded data to the host computer for subsequent data analysis.

[0010] Furthermore, the installation fixture of the test tooling layer includes an IGBT driver board test tooling, a bypass trigger board test tooling, and a high-voltage sampling and thyristor trigger board test tooling.

[0011] Furthermore, the test excitation board includes the following functions: generation of test excitation signals, collection of feedback signals from the tested board, preliminary calculation of the collected data, control of high-voltage power supply equipment, uploading of recorded data to a control host computer, and protection of test personnel.

[0012] Furthermore, the test excitation and recording layer also includes a personnel protection circuit, which includes a logic control circuit and an overvoltage detection circuit connected thereto, an insulation performance detection circuit of the equipment, an opening and closing detection circuit of the upper cover, a forced shutdown button, and a high-voltage discharge control circuit. The logic control circuit is also connected to the control chip of the test excitation board. When a danger is detected, the circuit is forced to shut down and trigger the rapid discharge of the high-voltage circuit.

[0013] Furthermore, for the safety of personnel, each detection circuit adopts a 3-out-of-2 method to output the detection results. At the same time, the high-voltage equipment will be forced to stop and discharge according to the action of the forced stop button and the stop high-voltage command sent by the control chip of the test excitation board.

[0014] Furthermore, the top layer of the test box is a lid that can be flipped up, and the monitoring layer is arranged on the lid panel, which is convenient for testers to place the board on the test tooling layer, display the high-voltage output status inside the test box, lock the top lid during the high-voltage test, and display the board test status.

[0015] Furthermore, there is an emergency stop button on the cover panel of the test box.

[0016] Furthermore, the host computer provides test operation interface, recording data analysis, report generation and other functions, and has the following functions:

[0017] 1) Control the test, set various test function parameters, and start and end the test process;

[0018] 2) Record the test process and record the data of the excitation signal and feedback signal during the test;

[0019] 3) Analyze the test data and the recorded wave data during the test to determine the health status of the board;

[0020] 4) Display the test results, show the link where the fault is located, generate a test report, and store the fault information, fault recording data, board number and other related information to facilitate the tester to call and analyze.

[0021] A personnel protection circuit control method of a field detection device of a control board in a flexible DC power transmission converter valve submodule, which performs personnel protection control through a logic control circuit, includes the following steps:

[0022] 1) Three independent overvoltage detection circuits, three independent insulation detection circuits, and three independent upper cover opening and closing detection circuits are used to detect the voltage, insulation, and upper cover opening and closing of the test box respectively;

[0023] 2) The three detection results are respectively input into their respective 3-to-2 circuits after passing through their respective filtering circuits;

[0024] 3) The output result of the three-way 3-choose-2 circuit is input to the first logic OR operation module, and the first logic OR operation module is input to the second logic OR operation module after passing through the delay filter circuit;

[0025] 4) The forced stop button signal is input into the second logic or operation module through the filter circuit;

[0026] 5) After the communication information of the control chip of the test excitation board is parsed by the protocol, the high voltage stop instruction is extracted and also input into the second logic or operation module;

[0027] 6) The output result of the second logic or operation module controls the high-voltage discharge control circuit. When the forced stop button sends a stop command, the 3-to-2 circuit of the overvoltage detection circuit sends a stop command, the 3-to-2 circuit of the insulation detection circuit sends a stop command, the 3-to-2 circuit of the upper cover opening and closing detection circuit sends a stop command, and the high-voltage stop command sent by the control chip of the test excitation board sends a signal, the high-voltage discharge control circuit is driven after passing through the second logic or operation module to control the high-voltage circuit to discharge rapidly.

[0028] Furthermore, the logic control circuit can be implemented by using CPLD.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1) The on-site detection device of the control board in the flexible DC power transmission converter valve submodule of the present invention provides installation fixtures and test tooling interfaces for all the boards to be tested through the test tooling layer according to the functional characteristics of various control boards in the converter valve submodule, generates test excitation signals through the test excitation and recording layer, collects feedback signals of the boards to be tested, performs preliminary calculations on the collected data, controls high-voltage power supply equipment, uploads recorded wave data to a control host computer, and protects test personnel. The design of the test tooling layer and the test excitation and recording layer improves the work efficiency of detection and maintenance;

[0031] 2) The design of personnel protection circuit and its control logic effectively realizes the safety protection of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is an overall structural diagram of a field detection device for a control board in a flexible DC power transmission converter valve submodule of the present invention;

[0033] Figure 2 It is a three-dimensional structural diagram of an on-site detection device of a control board in a flexible DC power transmission converter valve submodule of the present invention;

[0034] Figure 3 This is the personnel protection circuit diagram of the present invention.

[0035] In the figure: 11-test box 12-host computer 13-power layer 14-test excitation recording layer 15-test tooling layer 21-handrail 22-upper cover 23-test tooling layer space 24-test excitation recording layer space 25-power layer space 31-overvoltage detection circuit 32-equipment insulation performance detection circuit 33-upper cover opening and closing detection circuit 34-forced stop button 35-high voltage discharge control circuit 41-3 out of 2 circuit (1) 42-3 out of 2 circuit (2) 43-3 out of 2 circuit (3) 44-first logic OR operation module 45-protocol analysis 46-second logic OR operation module. DETAILED DESCRIPTION

[0036] The specific implementation modes provided by the present invention are described in detail below with reference to the accompanying drawings.

[0037] like Figure 1-Figure 3 As shown, a field detection device for a control board in a flexible DC transmission converter valve submodule includes a test box 11 and a host computer 12.

[0038] The test box 11 includes multiple layers. The upper surface of the test box 11 is a monitoring layer (on the upper cover 22). The inside of the box is separated into a test tooling layer space 23, a test excitation recording layer space 24, and a power supply layer space 25 by multiple partitions, and the test tooling layer 15, the test excitation recording layer 14, and the power supply layer 13 are placed respectively.

[0039] The test fixture layer 15 provides installation fixtures and test fixture interfaces for all boards under test.

[0040] The test excitation and recording layer 14 is installed with a test excitation board, which is downwardly connected to the test tooling interface of the test tooling layer 15, and is connected to the board under test through the test tooling interface, and is upwardly connected to the host computer 12. The test process is fully controlled according to the instructions of the host computer 12, and all control data and feedback data generated in the test are recorded, and the recorded data is transmitted to the host computer 12 for subsequent data analysis.

[0041] 1. Test tooling layer 15

[0042] The test fixture layer 15 provides installation fixtures and test fixture interfaces for all boards under test. The installation fixtures of the test fixture layer 15 include IGBT driver board test fixtures, bypass trigger board test fixtures, and high voltage sampling and thyristor trigger board test fixtures.

[0043] 2. Test stimulus and recording layer 14

[0044] The test excitation and recording layer 14 is installed with a test excitation board. In this embodiment, the test excitation board includes the following functions: generation of test excitation signals, collection of feedback signals from the tested board, preliminary calculation of the collected data, control of high-voltage power supply equipment, uploading of recorded data to the host computer, and protection of test personnel.

[0045] In this embodiment, the test stimulus board 14 includes a main control MCU chip and a programmable logic chip FPGA (or an integrated chip of MCU and FPGA), which constitute a core control module. This module is responsible for the overall control of the test process and the monitoring of feedback data. The core control module is also equipped with a large-capacity storage chip that can cache the recorded wave data during the test process; it also includes a communication circuit composed of Ethernet and RS485; it also includes a test function circuit composed of an analog-to-digital conversion circuit, a digital-to-analog conversion circuit, a digital input circuit, a digital output circuit, etc.

[0046] In this embodiment, the test excitation and recording layer 14 also includes a personnel protection circuit, which includes a logic control circuit and an overvoltage detection circuit 31 connected thereto, an insulation performance detection circuit 32 of the equipment, an opening and closing detection circuit 33 of the upper cover, a forced shutdown button 34, and a high-voltage discharge control circuit 35. The logic control circuit is also connected to the control chip FPGA of the test excitation board. When a danger is detected, it forces a shutdown and triggers the rapid discharge of the high-voltage circuit.

[0047] For personnel safety, each detection circuit uses a 3-out-of-2 method to output the detection results. At the same time, the high-voltage equipment will be forced to stop and discharge according to the action of the forced stop button and the stop high-voltage command sent by the main control chip of the test excitation board.

[0048] 3. Monitoring Layer

[0049] In this embodiment, the top layer of the test box 11 is a lid that can be flipped up - the upper cover 22, and the monitoring layer is arranged on the panel of the upper cover 22, which is convenient for the tester to place the board on the test tooling layer 15, display the high-voltage output status inside the test box 11, lock the top cover during the high-voltage test, and display the board test status.

[0050] In this embodiment, an emergency stop button is also provided on the panel of the upper cover 22 of the test box 11 .

[0051] 4. Power layer 13

[0052] The power layer 13 mainly provides power supply for the board, boost device and rapid discharge control of the high-voltage part, etc. It is mainly composed of the following parts: a power module that provides power to each board in the test box 11; an adjustable high-voltage power module that provides high-voltage test conditions for the test board; and a discharge circuit that can discharge high-voltage energy.

[0053] 5. Host computer

[0054] The host computer provides test operation interface, recording data analysis, report generation and other functions, and has the following functions:

[0055] 1) Control the test, set various test function parameters, and start and end the test process;

[0056] 2) Record the test process and record and store the data of the excitation signal and feedback signal during the test;

[0057] 3) Analyze the test data and the recorded wave data during the test to determine the health status of the board;

[0058] 4) Display the test results, show the link where the fault is located, generate a test report, and store the fault information, fault recording data, board number and other related information to facilitate the tester to call and analyze.

[0059] like Figure 2As shown, it is a three-dimensional structural diagram of a test cabinet for a field detection device of a control board in a flexible DC power transmission converter valve submodule. The test box 11 is provided with a handrail 21, and four universal rollers 26 are installed under the test box 11 to facilitate operators to move the cabinet. The upper cover 22 of the test box 11 at the top of the outside is a cover that can be flipped up, which is convenient for testers to place the board in the test tooling layer space 23. At the same time, it can display the test status, the high voltage and current conditions inside the test box during the test. It can be automatically locked during the test, and personnel cannot open the cover at will. It has an emergency stop button. When a problem occurs during the test, the high-voltage electric energy in the test box can be quickly consumed through the high-voltage discharge circuit when a fault occurs; the second layer of the cabinet is the test tooling layer space 23 for placing various tools and tested boards; the third layer of the cabinet is the test excitation recording layer space 24, which is used to place the test excitation board, and the personnel protection circuit is also placed on this layer; the fourth layer of the cabinet is the power supply layer space 25, which is used to place the power supply module and the high-voltage module.

[0060] like Figure 3 As shown, a personnel protection circuit control method of a field detection device of a control board in a flexible DC transmission converter valve submodule performs personnel protection control through a logic control circuit, including the following:

[0061] 1) Three independent overvoltage detection circuits 31, three independent insulation detection circuits 32, and three independent upper cover opening and closing detection circuits 33 are used to detect the voltage, insulation, and upper cover opening and closing of the test box 11 respectively;

[0062] 2) The three detection results are respectively input into respective 3-to-2 circuits 41, 42 and 43 after passing through respective filter circuits;

[0063] 3) The output results of the three-way 3-choose-2 circuits 41, 42 and 43 are input to the first logic OR operation module 44, and the first logic OR operation module 44 is input to the second logic OR operation module 46 after passing through the delay filter circuit;

[0064] 4) The forced stop button signal 34 is input to the second logic or operation module 46 through the filter circuit;

[0065] 5) After the communication of the master FPGA is parsed by the protocol 45, the high voltage stop instruction is extracted and also input into the second logic or operation module 46;

[0066] 6) The output result of the second logic OR operation module 46 controls the high-voltage discharge control circuit 35. When the forced stop button 34 issues a stop command, the 3-in-2 circuit 41 of the overvoltage detection circuit 31 issues a stop command, the 3-in-2 circuit 42 of the insulation detection circuit 32 issues a stop command, the 3-in-2 circuit 43 of the upper cover opening and closing detection circuit 33 issues a stop command, and the high-voltage stop command signal sent by the main control FPGA is sent, the high-voltage discharge control circuit is driven after passing through the second logic OR operation module 46 to control the high-voltage circuit 35 to discharge quickly.

[0067] The logic control circuit is implemented by CPLD and includes the above-mentioned 3-to-2 circuits 41, 42 and 43, a first logic OR operation module 44, a second logic OR operation module 46, a protocol analysis 45 and various filter circuits.

[0068] The above embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the above embodiments are conventional methods unless otherwise specified.

Claims

1. A field detection device for a control board in a flexible DC transmission converter valve submodule, characterized in that: Including test box and host computer; The test box comprises multiple layers, the upper surface of the test box is a monitoring layer, and the inside of the box is separated into a test tooling layer, a test excitation and recording layer, and a power supply layer by multiple partitions; The test fixture layer provides installation fixtures and test fixture interfaces for all boards under test; The test excitation and recording layer is equipped with a test excitation board, which is downwardly connected to the test fixture interface of the test fixture layer, and is connected to the board under test through the test fixture interface, and upwardly connected to the host computer, and controls the test process comprehensively according to the host computer instructions, and records all control data and feedback data generated in the test, and transmits the recorded data to the host computer for subsequent data analysis; The test excitation and recording layer also includes a personnel protection circuit, which includes a logic control circuit and an overvoltage detection circuit connected thereto, an equipment insulation performance detection circuit, an upper cover opening and closing detection circuit, a forced shutdown button, and a high-voltage discharge control circuit. The logic control circuit is also connected to the control chip of the test excitation board. When a danger is detected, the device is forced to shut down and trigger the rapid discharge of the high-voltage circuit.

2. The on-site detection device for the control board in the flexible DC transmission converter valve submodule according to claim 1 is characterized in that: The installation fixtures of the test tooling layer include an IGBT driver board test tooling, a bypass trigger board test tooling, and a high-voltage sampling and thyristor trigger board test tooling.

3. The on-site detection device for the control board in the flexible DC transmission converter valve submodule according to claim 1 is characterized in that: The test excitation board includes the following functions: generation of test excitation signals, collection of feedback signals from the tested board, preliminary calculation of the collected data, control of high-voltage power supply equipment, uploading of recorded data to the host computer, and protection of test personnel.

4. The on-site detection device for the control board in the flexible DC transmission converter valve submodule according to claim 1 is characterized in that: For personnel safety, each detection circuit uses a 3-out-of-2 method to output the detection results. At the same time, the high-voltage equipment will be forced to stop and discharge according to the action of the forced stop button and the stop high-voltage command sent by the control chip of the test excitation board.

5. The on-site detection device for the control board in the flexible DC transmission converter valve submodule according to claim 1 is characterized in that: The top layer of the test box is a lid that can be flipped up, and the monitoring layer is arranged on the lid panel, which is convenient for testers to place boards on the test tooling layer, display the high-voltage output status inside the test box, lock the top lid during high-voltage testing, and display the board test status.

6. The on-site detection device for the control board in the flexible DC transmission valve submodule according to claim 5, characterized in that: There is also an emergency stop button on the lid panel of the test box.

7. The on-site detection device for the control board in the flexible DC transmission converter valve submodule according to claim 1 is characterized in that: The host computer provides test operation interface, recording data analysis, report generation and other functions, and has the following functions: 1) Control the test, set various test function parameters, and start and end the test process; 2) Record the test process and record the data of the excitation signal and feedback signal during the test; 3) Analyze the test data and the recorded data during the test to determine the health status of the board; 4) Display the test results, show the link where the fault is located, generate a test report, and store the fault information, fault recording data, board number and other related information to facilitate testers to call and analyze.

8. The method for controlling a personnel protection circuit of a field detection device of a control board in a flexible DC power transmission converter valve submodule according to claim 1, characterized in that: Personnel protection control is performed through the logic control circuit, including the following: 1) Three independent overvoltage detection circuits, three independent insulation detection circuits, and three independent upper cover opening and closing detection circuits are used to detect the voltage, insulation, and upper cover opening and closing of the test box respectively; 2) The three detection results are respectively input into their respective 3-to-2 circuits after passing through their respective filter circuits; 3) The output results of the three-way 3-choose-2 circuit are input to the first logic OR operation module, and the first logic OR operation module is input to the second logic OR operation module after the delay filter circuit; 4) The forced stop button signal is input into the second logic or operation module through the filter circuit; 5) After the communication information of the control chip in the test stimulus board is parsed by the protocol, the high voltage stop instruction is extracted and also input into the second logic or operation module; 6) The output result of the second logic OR operation module controls the high-voltage discharge control circuit. When the forced stop button sends a stop command, the 3-to-2 circuit of the overvoltage detection circuit sends a stop command, the 3-to-2 circuit of the insulation detection circuit sends a stop command, the 3-to-2 circuit of the upper cover opening and closing detection circuit sends a stop command, and the high-voltage stop command sent by the control chip of the test excitation board sends a signal, the high-voltage discharge control circuit is driven after passing through the second logic OR operation module to control the high-voltage circuit to discharge rapidly.

9. The method for controlling a personnel protection circuit of a field detection device of a control board in a flexible DC power transmission converter valve submodule according to claim 8, characterized in that: The logic control circuit is implemented by using CPLD.

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