IGCT function detection device for direct current transmission converter valve

Abstract

The utility model provides an IGCT function detection device for a DC power transmission converter valve. The IGCT function detection device comprises a forward energy supply unit, an energy supply switching unit, a reverse energy supply unit, a high-voltage dv / dt pulse unit, a high-voltage output switching unit, a logic control unit, an optical signal output unit, an attenuation sampling unit and a total output switching unit. According to the utility model, the number of output connecting lines is small, and electric energy and various required test waveforms can be provided for the whole tested IGCT single valve unit only by outputting the A main line, the K main line and the two optical fibers; by using the device, a plurality of functional tests such as normal triggering, short circuit detection, overvoltage protection detection, reverse recovery detection, turn-off detection, reverse blocking voltage detection, state return detection and the like of a single tested IGCT valve unit can be completed through single setting.

Description

Technical Field

[0001] The utility model belongs to the field of electronic industry, and specifically relates to the field of high-voltage direct current transmission core component detection. Background Art

[0002] Under the background of the rapid development of the current DC transmission industry, the technical requirements are mainly focused on green intelligence and higher power levels. However, due to the limitations of the semi-controlled device thyristor itself, traditional valves will encounter inevitable problems in application. In recent years, in order to solve these problems, the industry has gradually explored and turned to a new type of converter valve technology with the fully controlled device IGCT as the core to replace the thyristor. This IGCT for the converter valve not only has the traditional functions of the thyristor, but also because of its unique structure (the GCT chip is integrated with its driver circuit board), the function of the original TE board on the valve is also integrated into the IGCT, which greatly reduces the construction difficulty and improves the integration and reliability of the converter valve. However, the rise of the new converter valve technology has also brought a new challenge, that is, how to perform functional testing on the core device IGCT for the converter valve, and reduce or eliminate the failure rate of the converter valve after assembly, which has become a problem that needs to be solved urgently. Utility Model Content

[0003] In order to solve the above problems, the utility model provides an IGCT function detection device for a DC transmission converter valve.

[0004] The technical solution of the utility model is: an IGCT function detection device for a DC transmission converter valve, including a forward energy supply unit, an energy supply switching unit, a reverse energy supply unit, a high-voltage dv / dt pulse unit, a high-voltage output switching unit, a logic control unit, an optical signal transceiver unit, an attenuation sampling unit, and a total output switching unit.

[0005] The forward energy supply unit and the reverse energy supply unit are connected to the energy supply switching unit. The logic control unit is respectively connected to the energy supply switching unit, the high-voltage output switching unit, the optical signal transceiver unit, the attenuation sampling unit, and the total output switching unit. The high-voltage dv / dt pulse unit is respectively connected to the optical signal transceiver unit and the high-voltage output switching unit.

[0006] Preferably, the forward energy supply unit comprises a power transformer, a current limiting resistor, and a high-voltage and high-current silicon stack, and is used to output a forward low-voltage and high-current to provide a forward energy supply for the IGCT under test.

[0007] Preferably, the reverse energy supply unit comprises a high-voltage transformer, a current-limiting resistor, and a high-voltage and high-current silicon stack, and is used to output a reverse current to provide a reverse energy supply for the IGCT under test.

[0008] Preferably, the energy supply switching unit includes two high-voltage relays, which are used to close at the required moment to connect the forward and reverse energy supply units, so as to ensure stable and reliable energy supply for the IGCT under test.

[0009] Preferably, the high-voltage dv / dt pulse unit includes a phase-shifting voltage regulation module, a high-voltage transformer, a support capacitor, an isolated output thyristor, a resistor for generating dv / dt, a capacitor for generating dv / dt, an isolation transformer, a switching power supply, and a thyristor trigger. It is used to output high-voltage dv / dt pulses at the required moment.

[0010] Preferably, the high-voltage output switching unit includes two single-pole double-throw high-voltage relays. It is used to switch the direction (positive voltage or negative voltage) of the high-voltage dv / dt pulse output.

[0011] Preferably, the logic control unit includes an STM32F407 logic controller and a relay group. It is used to control the relay coils of each switching unit to close at the required moment and control the output of high-voltage dv / dt at the required moment.

[0012] Preferably, the optical signal output unit includes 2 HFBR1521Z optical signal transmitters and 1 HFBR2521Z optical signal receiver. It is used to control the thyristor trigger B2 of the high-voltage dv / dt unit, provide trigger and turn-off optical signals for the IGCT under test, and receive the optical signals fed back by the IGCT under test.

[0013] Preferably, the attenuation sampling unit includes two high-voltage attenuation resistors and two sampling resistors. It is used to attenuate the high voltage to a voltage acceptable to the controller, detect the voltage state, and at the same time detect the current state in the loop.

[0014] Preferably, the total output switching unit includes two high-voltage relays, which are used to close and connect to the IGCT under test at the required moment.

[0015] The beneficial effects of the present utility model are:

[0016] 1. The output connection wires are few. Only two main wires A and K and two optical fibers are needed to provide energy extraction and various test waveforms required for the entire IGCT single valve unit under test.

[0017] 2. Using this device, functions such as normal triggering, short-circuit detection, overvoltage protection detection, reverse recovery detection, turn-off detection, reverse blocking voltage detection, and status return detection of the single valve unit can be completed with a single setting. Description of the Drawings

[0018] Att Figure 1 is the block diagram of the connection structure of each unit of the present utility model.

[0019] AttFigure 2 It is a schematic diagram of the external connection of the present utility model.

[0020] Appendix Figure 3 It is a schematic diagram of the principle of the present utility model. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings herein can be arranged and designed in various different configurations. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model. In the embodiments, the components of the embodiments of the present application usually described and shown in the accompanying drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application to be protected, but only represents the selected embodiments of the present application.

[0022] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be an electrical connection; it can be a hydraulic oil circuit connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0024] According to the appendix Figure 1The block diagram of the connection structure of each unit specifically illustrates the working logic of the present invention as follows: A function detection device for an IGCT used in a DC transmission converter valve includes a forward power supply unit (1), a power supply switching unit (2), a reverse power supply unit (3), a high-voltage dv / dt pulse unit (4), a high-voltage output switching unit (5), a logic control unit (6), an optical signal transceiver unit (7), an attenuation sampling unit (8), and a total output switching unit (9).

[0025] The forward power supply unit (1) and the reverse power supply unit (3) are connected to the power supply switching unit (2), and are connected to the total output switching unit (9) through the attenuation sampling unit (8) and then output to the IGCT under test, for providing forward and reverse energy to the IGCT under test.

[0026] The high-voltage dv / dt pulse unit (4) is connected to the high-voltage output switching unit (5), and is connected to the total output switching unit (9) through the attenuation sampling unit (8) and output to the ICGT under test, for outputting forward or reverse high-voltage dv / dt pulses at the required moment to detect whether the functions of the IGCT under test are normal. The optical signal transceiver unit (7) is connected to the high-voltage dv / dt pulse unit (4), for sending signals to this unit to trigger the internal thyristor to output high-voltage dv / dt pulses.

[0027] The logic control unit (6) is respectively connected to the power supply switching unit (2), the high-voltage output switching unit (5), and the total output switching unit (9), for controlling the switching units to be switched on and output at the required moment. The logic control unit (6) is also connected to the optical signal transceiver unit (7), for controlling the thyristor in the high-voltage dv / dt pulse unit (4) to generate high-voltage dv / dt pulses. The logic control unit (6) communicates with the IGCT under test through the optical signal transceiver unit (7) and the optical fiber to trigger the IGCT under test and receive the return signal. The logic control unit (6) is connected to the attenuation sampling unit (8) for detecting the voltage and current states in the loop.

[0028] According to the appendix Figure 2 The external connection method of the present invention is specifically described as follows:

[0029] The A and K high-voltage and high-current output terminals of the IGCT function detection device 1 for the DC transmission converter valve are respectively connected to the HIGH and LOW output terminals of the IGCT single valve unit 2, for providing electrical energy for the normal operation of the IGCT under test.

[0030] The output optical fiber is connected to the two optical fiber connectors of the driving unit of the IGCT under test, for controlling the opening and closing of the IGCT under test and receiving the status reported by the IGCT under test.

[0031] According to the appendix Figure 3 The working principle of the present invention is specifically described as follows:

[0032] The forward power supply unit (1) includes a power transformer T1, a current-limiting resistor R3, and a high-voltage high-current silicon stack D1. After the power transformer T1 boosts the 220V voltage to 500V, it is connected to the power supply switching unit (2) via the current-limiting resistor and the high-voltage high-current silicon stack, and is used to output a forward low-voltage high-current to provide a forward power supply for the IGCT under test.

[0033] The power supply switching unit (2) includes two high-voltage relays S1-1 and S2-1, which are used to be energized at the required moment. One end is connected to the forward power supply unit (1) and the reverse power supply unit (2), and the other end is connected to the attenuated sampling unit (8). The attenuated sampling unit (8) is connected to the total output switching unit (9), so as to ensure stable and reliable energy supply for the IGCT under test and disconnect the power supply of the IGCT under test when energy supply is not required.

[0034] The reverse power supply unit (3) is composed of a high-voltage transformer T2, a current-limiting resistor R4, and a high-voltage high-current silicon stack D2. After the high-voltage transformer T2 boosts the 220V voltage to 2500V, it is connected in reverse series with the high-voltage high-current silicon stack D2. D2 is connected to the power supply switching unit (2) in series with the current-limiting resistor R4, and is used to output a reverse current to provide a reverse power supply for the IGCT under test.

[0035] The high-voltage dv / dt pulse unit (4) includes a phase-shifting voltage-regulating module V1, a high-voltage transformer T3, a support capacitor C2, an isolated output thyristor Q1, a resistor R5 for generating dv / dt, a capacitor C3 for generating dv / dt, an isolation transformer T4, a switching power supply B1, and a thyristor trigger B2. The phase-shifting voltage-regulating module V1 is connected to the high-voltage transformer T3, and the high-voltage transformer T3 is connected to the support capacitor C2. The phase-shifting voltage-regulating module V1 adjusts the phase and voltage of the input signal and boosts it through the high-voltage transformer T3 to achieve precise control of the charging voltage of the support capacitor C2. The support capacitor C2 is connected to the anode of the isolated output thyristor Q1. The isolated output thyristor Q1 is connected in series in the forward direction in the circuit, and the cathode is connected to the resistor R5 for generating dv / dt. The resistor R5 for generating dv / dt is connected to the capacitor C3 for generating dv / dt, and is used to generate a high-voltage dv / dt pulse with an adjustable voltage. The gate and cathode of the isolated output thyristor Q1 are connected to the thyristor trigger B2. The thyristor trigger B2 is connected to the optical signal transceiver unit (7) through an optical fiber to receive an optical trigger signal, and the thyristor trigger B2 is used to trigger the gate of the isolated output thyristor Q1 at the required moment. The isolation transformer T4 and the switching power supply B1 are used to provide the required supply voltage for the thyristor trigger B2 and the logic control unit (6).

[0036] The high-voltage output switching unit (5) includes two single-pole double-throw high-voltage relays. The single input ends of the two high-voltage relays are respectively connected to the output of the high-voltage dv / dt pulse unit (4), and the output ends are connected to the output end of the energy supply switching unit (2) and the input end of the attenuation sampling unit (8), and are used to switch the direction (positive voltage or negative voltage) of the output high-voltage dv / dt pulse.

[0037] The logic control unit (6) is composed of a circuit board AP1, which includes a U1 STM32F407 logic controller and a J1 relay group. The logic control unit (6) is powered by B1 in the high-voltage dv / dt pulse unit (4). The U1 STM32F407 logic controller isolates and controls through the J1 relay group, and the energy supply switching unit (2), the high-voltage output switching unit (5), and the total output switching unit (9) are energized at the required moment, and control the output of the high-voltage dv / dt at the required moment by connecting with the optical signal transceiver unit (7). The logic control unit (6) controls the opening and closing of the measured IGCT through the optical signal transceiver unit (7) and receives the return signal of the measured IGCT. The logic control unit (6) is connected to the attenuation sampling unit (8) for detecting the attenuated voltage and current signals.

[0038] The optical signal transceiver unit (7) is composed of a circuit board AP2, which includes two HFBR1521Z (V1, V2) responsible for output signal conversion and one HFBR2521Z (V3) responsible for input signal conversion. The electrical signal output by the logic control unit (6) is converted into an optical signal by connecting with the logic control unit (6). It is used for signal conversion with the high-voltage dv / dt pulse unit (4) and the measured IGCT valve unit.

[0039] The attenuation sampling unit (8) includes a voltage attenuation sampling composed of two high-voltage attenuation resistors R6 and R7 and a voltage sampling resistor R8, and a current sampling loop composed of an R9 current sampling resistor, and is used to attenuate and sample the voltage and current signals in the loop, and send the attenuated and sampled signals to the logic control unit (6).

[0040] The total output switching unit (9) includes two high-voltage relays S5-1 and S6-1, and is used to connect the internal and external measured IGCTs of the device at the required moment to ensure that there is no voltage output to the measured IGCT when the output is not required.

[0041] The entire device is powered by a 220V power grid. When it is necessary to complete normal triggering, short-circuit detection, and their corresponding status feedback detection functions, the logic control unit (6) controls the suction energy supply switching unit (2) and the total output switching unit (9), and the forward energy supply unit (1) and the reverse energy supply unit (3) provide the forward and reverse power supplies required for the IGCT under test to draw energy. The logic control unit (6) sends various control signals to the IGCT under test through the optical signal transceiver unit (7) and judges the various states of the IGCT under test based on the voltage and current signals attenuated by the attenuation sampling unit (8). At the same time, it detects the feedback status sent back by the IGCT under test to check whether the functions of each unit built in the IGCT driver are normal.

[0042] When it is necessary to complete overvoltage protection detection, reverse recovery detection, automatic shutdown detection, reverse blocking voltage detection, status feedback detection, and their corresponding status feedback detection functions, the logic control unit (6) controls the suction energy supply switching unit (2) and the total output switching unit (9), and the forward energy supply unit (1) and the reverse energy supply unit (3) provide the required forward and reverse power supplies for the IGCT under test. The logic control unit (6) controls the high-voltage dv / dt pulse unit (4) to output the required adjustable voltage high-voltage dv / dt waveform. And at the required moment, the logic control unit (6) sends various control signals to the IGCT under test through the optical signal transceiver unit (7), and judges the various states of the IGCT under test based on the voltage and current signals attenuated by the attenuation sampling unit (8). At the same time, it receives the feedback status sent back by the IGCT under test to check whether the functions of each unit built in the IGCT driver are normal. At the moment of reverse blocking voltage detection, the logic control unit (6) controls the suction high-voltage output switching unit (5) to output a reverse high-voltage dv / dt waveform, and judges the various states of the IGCT under test based on the voltage and current signals attenuated by the attenuation sampling unit (8).

[0043] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An IGCT function detection device for a DC power transmission converter valve, comprising a forward energy supply unit, a reverse function unit, a high-voltage dv / dt pulse unit and a logic control unit, characterized in that: The forward energy supply unit and the reverse energy supply unit are both connected to the energy supply switching unit, which is connected to the total output switching unit after passing through the attenuation sampling unit, and the total output switching unit outputs to the IGCT under test and provides forward and reverse energy to the IGCT under test; The high voltage dv / dt pulse unit is connected to the total output switching unit via the high voltage output switching unit and the attenuation sampling unit; The high-voltage dv / dt pulse unit is connected to an optical signal transceiver unit, and after receiving the optical signal, the high-voltage dv / dt pulse unit triggers its internal thyristor to output a high-voltage dv / dt pulse; The logic control unit is connected to the optical signal transceiver unit, and triggers and receives the signal of the IGCT under test through the optical signal transceiver unit; The logic control unit is connected to the attenuation sampling unit and is used to detect the voltage and current status in the loop.

2. The IGCT function detection device for a DC power transmission converter valve according to claim 1, characterized in that: The logic control unit is connected with the energy supply switching unit, the high voltage output switching unit and the total output switching unit, and is used to control each switching unit to close and output at a required time.

3. The IGCT function detection device for a DC power transmission converter valve according to claim 1, characterized in that: The forward energy supply unit includes a power transformer, a current limiting resistor and a forward high-voltage and high-current silicon stack. After the power transformer T1 increases the 220V voltage to 500V, it is connected to the energy supply switching unit through the current limiting resistor and the forward high-voltage and high-current silicon stack D1.

4. The IGCT function detection device for a DC power transmission converter valve according to claim 1, characterized in that: The energy supply switching unit comprises two high-voltage relays, one end of which is connected to the forward energy supply unit and the reverse energy supply unit, and the other end is connected to the total output switching unit through the attenuation sampling unit.

5. The IGCT function detection device for a DC power transmission converter valve according to claim 1, characterized in that: The reverse energy supply unit includes a high-voltage transformer, a current-limiting resistor and a reverse high-voltage and high-current silicon stack. After the high-voltage transformer increases the 220V voltage to 2500V, it is connected to the energy supply switching unit through the reverse high-voltage and high-current silicon stack and the current-limiting resistor.

6. The IGCT function detection device for a DC power transmission converter valve according to claim 1, characterized in that: The high-voltage dv / dt pulse unit includes a phase-shifting and voltage-regulating module, a high-voltage transformer and a supporting capacitor. The phase-shifting and voltage-regulating module is connected to the high-voltage transformer, which is connected to the supporting capacitor. The phase-shifting and voltage-regulating module adjusts the phase and voltage of the input signal and controls the charging voltage of the supporting capacitor after the high-voltage transformer boosts the voltage.

7. The IGCT function detection device for a DC power transmission converter valve according to claim 6, characterized in that: The high-voltage dv / dt pulse unit also includes an isolated output thyristor, a resistor generating dv / dt and a thyristor trigger. The supporting capacitor is connected to the anode of the isolated output thyristor. The isolated output thyristor is connected in series in the loop in the forward direction and its cathode is connected to the resistor generating dv / dt. The gate and cathode of the isolated output thyristor are connected to the thyristor trigger. The thyristor trigger is connected to the optical signal transceiver unit through an optical fiber.

8. The IGCT function detection device for a DC power transmission converter valve according to claim 1, characterized in that: The high-voltage output switching unit includes two single-pole double-position high-voltage relays, the single input ends of the two single-pole double-position high-voltage relays are respectively connected to the output ends of the high-voltage dv / dt pulse unit, and the output ends are connected to the output end of the energy supply switching unit and the input end of the attenuation sampling unit.

9. The IGCT function detection device for a DC power transmission converter valve according to claim 1, characterized in that: The logic control unit is composed of a circuit board, which includes a logic controller and a relay group. The logic controller isolates and controls the energy supply switching unit, the high-voltage output switching unit, and the total output switching unit to be attracted when needed by controlling the relay group.

10. The IGCT function detection device for a DC power transmission converter valve according to claim 1, characterized in that: The attenuation sampling unit includes a voltage attenuation sampling circuit and a current sampling circuit. The voltage attenuation sampling loop includes a high-voltage attenuation resistor and a voltage sampling resistor, and there are two high-voltage attenuation resistors.

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