Device and method for testing active turn-off function of HCC converter valve

Abstract

The invention discloses an HCC converter valve active turn-off function test device and method, and relates to the field of power electronics. According to the HCC converter valve active turn-off function testing device, the HCC converter valve is formed by connecting a plurality of IGCT modules in series, and each IGCT module comprises an IGCT integrated control unit, a damping resistor, a damping capacitor and a static voltage-sharing resistor; the IGCT integrated control unit and the static voltage-sharing resistor are arranged in parallel, and are sequentially connected with the damping resistor and the damping capacitor in series; the IGCT integrated control unit comprises a driving unit and a GCT element; the anode of the GCT element is electrically connected with the first node, the cathode and the grid electrode of the GCT element are electrically connected with the driving unit, and the driving unit is further electrically connected with the second node and the third node; the test device comprises a test device which is connected in parallel with the IGCT module and is used for detecting the active turn-off function of the IGCT integrated control unit. According to the invention, detailed detection can be carried out on device parameters, triggering, turn-off, return and other functions in the IGCT module.

Description

Technical Field

[0001] This invention relates to the field of power electronics, and in particular to a test device and method for the active shut-off function of an HCC converter valve. Background Technology

[0002] In recent years, extensive research has been conducted on the commutation failure problem in LCC-HVDC (line-commutated converter high voltage direct current) systems, combining different fields such as devices, equipment, and systems. A hybrid commutated converter (HCC) technology based on a reverse block-integrated gate commutation thyristor (RB-IGCT) has been proposed. This converter valve, developed by leveraging the good turn-off recovery characteristics and controllable turn-on / turn-off of the device, can effectively suppress and resist commutation failure in DC systems. Furthermore, it is cost-effective and has good technical and economic efficiency, making it the most ideal technology for DC transmission at present and potentially the main direction of future development.

[0003] The development and engineering application of HCC converter valves, including the research and verification of equivalent testing methods, is a crucial aspect. Currently, there are no dedicated testing standards for HCC converter valves, and testing requirements and methods require further research. Therefore, to ensure the normal operation of HCC converter valves, detailed functional testing is necessary to guarantee the full functionality of each IGCT module. Summary of the Invention

[0004] The purpose of this invention is to provide a testing device and method for the active shutdown function of HCC converter valves, which can perform detailed testing on the device parameters and functions such as triggering, shutdown, and reporting within the IGCT module.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: This invention provides a testing device for the active shut-off function of an HCC converter valve. The HCC converter valve is composed of multiple IGCT modules connected in series, and each IGCT module includes: The IGCT integrates a control unit, damping resistors, damping capacitors, and static voltage equalization resistors. The IGCT integrated control unit and the static voltage equalization resistor are connected in parallel, and are connected in series with the damping resistor and the damping capacitor in sequence; The IGCT integrated control unit includes: a drive unit and GCT components; The anode of the GCT element is electrically connected to the first node, and the cathode and gate of the GCT element are both electrically connected to the driving unit. The driving unit is also electrically connected to the second node and the third node, respectively. The testing apparatus includes a testing device connected in parallel with the IGCT module, used to test the active shutdown function of the IGCT integrated control unit.

[0006] In some embodiments, the test apparatus includes a trigger fiber, a return fiber, and a test stand and a test handle connected in series. One end of the trigger fiber and the return fiber are electrically connected to the test bench, and the other end is electrically connected to the drive unit. The test stand is used to generate test voltages of different amplitudes and frequencies, and to send and receive feedback optical signals. The triggering optical fiber is used to transmit the pulses generated by the test bench to the drive unit; The feedback fiber is used to receive different feedback pulses generated by the driving unit to the test station.

[0007] In some embodiments, two damping resistors are provided, including a first damping resistor and a second damping resistor; The first end of the static voltage equalization resistor is electrically connected to the first node, and the second end of the static voltage equalization resistor is electrically connected to the second node; The first end of the first damping resistor is electrically connected to the first node, the second end of the first damping resistor is electrically connected to the first end of the damping capacitor, the second end of the damping capacitor is electrically connected to the first end of the second damping resistor, and the second end of the second damping resistor is electrically connected to the third node.

[0008] This invention also provides a method for testing the active shut-off function of an HCC converter valve, using the testing device described above, characterized by the following steps: S100, the test equipment performs a high-voltage protection trigger test on the IGCT integrated control unit; S200, 300~500us after the GCT element is turned on, the test equipment sends a 5±1us turn-off signal to the drive unit and detects the turn-off report light pulse of the drive unit at the same time. S300, if the test equipment detects the shutdown report light pulse, then a low-voltage trigger test is performed on the IGCT integrated control unit.

[0009] In some embodiments, the high-voltage protection trigger test includes the following steps: S110, the test equipment continuously applies a certain amount of AC voltage to the IGCT integrated control unit, and after a certain period of time, the drive unit can reach the rated value. S120, the test equipment applies an impulse voltage to the IGCT integrated control unit, detects whether the GCT element is conducting, and detects the width of the feedback pulse sent by the drive unit; S130, after the impulse voltage has been applied for a certain period of time, perform another low-voltage trigger test.

[0010] In some embodiments, the low-voltage trigger test includes the following steps: S310, the test equipment continuously applies a certain amount of power frequency AC voltage to the IGCT integrated control unit. After a certain period of testing, the drive unit can reach the rated value. S320, the test device detects the feedback light pulse sent by the driving unit. After receiving multiple feedback light pulses in a certain period of time, the test device immediately sends a light trigger pulse to the driving unit and detects whether the GCT element is turned on.

[0011] This invention provides a testing device and method for the active shutdown function of an HCC converter valve. By designing the testing equipment and a testing method for the HCC converter valve, the device parameters and functions such as triggering, shutdown, and reporting within the IGCT module can be tested in detail.

[0012] This invention provides a test device and method for the active shutdown function of HCC converter valve. The IGCT module can detect the resistance and capacitance parameters within the module without being disconnected, and can test various functions of the IGCT integrated control unit, including triggering, shutdown, high voltage protection and other functions.

[0013] This invention provides a testing device and method for the active shut-off function of an HCC converter valve. The testing method can perform detailed tests on the device parameters within the IGCT module and the various functions of the IGCT integrated control unit. Furthermore, the testing equipment can be used on the valve tower, facilitating module function testing during converter valve maintenance. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual process of the method, etc. involved in the embodiments of this disclosure.

[0015] Figure 1 The circuit schematic of the IGCT module according to some embodiments of this disclosure is shown below; Figure 2 The circuit diagram is shown below for a test device for the active shut-off function of an HCC converter valve according to some embodiments of this disclosure. Figure 3 This is a functional block diagram of the IGCT integrated control unit according to some embodiments of the present disclosure; Figure 4 This is a schematic diagram of the test voltage and pulse waveform for an active shutdown test according to some embodiments of this disclosure; Figure 5 This is a schematic diagram of the test voltage and pulse waveform for high-voltage protection triggering test according to some embodiments of this disclosure; Figure 6 This is a schematic diagram of the test voltage and pulse waveform for a low-voltage trigger test according to some embodiments of the present disclosure. Detailed Implementation

[0016] The technical solutions in some embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this disclosure are within the scope of protection of this disclosure.

[0017] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0018] This invention provides a testing device for the active shut-off function of an HCC converter valve, such as... Figure 1-3 As shown, the HCC converter valve is composed of multiple IGCT modules connected in series. Each IGCT module includes: an IGCT integrated control unit, a damping resistor Rs, a damping capacitor Cs, and a static equalizing resistor Rd.

[0019] In some embodiments, the IGCT integrated control unit and the static equalizing resistor Rd are connected in parallel, and then connected in series with the damping resistor Rs and the damping capacitor Cs.

[0020] In some embodiments, the IGCT integrated control unit includes a drive unit and a GCT element, wherein the anode of the GCT element is electrically connected to a first node N1, the cathode and gate of the GCT element are both electrically connected to the drive unit, and the drive unit is also electrically connected to a second node N2 and a third node N3, respectively.

[0021] like Figure 3 As shown, the IGCT integrated control unit is a crucial component for controlling the operation of the IGCT module, and its main functions are: 1) High-voltage self-powered; 2) Gate-triggered activation; 3) Gate-triggered shutdown; 4) Forward overvoltage protection; 5) Voltage monitoring; 6) Reverse recovery enhancement; 7) Fiber optic communication.

[0022] In some embodiments, the testing apparatus includes a testing device connected in parallel with the IGCT module for detecting the active shutdown function of the IGCT integrated control unit.

[0023] This invention provides a testing device and method for the active shutdown function of an HCC converter valve. By designing the testing equipment and a testing method for the HCC converter valve, the device parameters and functions such as triggering, shutdown, and reporting within the IGCT module can be tested in detail.

[0024] This invention provides a test device and method for the active shutdown function of HCC converter valve. The IGCT module can detect the resistance and capacitance parameters within the module without being disconnected, and can test various functions of the IGCT integrated control unit, including triggering, shutdown, high voltage protection and other functions.

[0025] This invention provides a testing device and method for the active shut-off function of an HCC converter valve. The testing method can perform detailed tests on the device parameters within the IGCT module and the various functions of the IGCT integrated control unit. Furthermore, the testing equipment can be used on the valve tower, facilitating module function testing during converter valve maintenance.

[0026] In some embodiments, the test apparatus includes a trigger fiber, a return fiber, and a test bench and a test handle connected in series.

[0027] In some embodiments, one end of the trigger fiber and the return fiber are electrically connected to the test bench, and the other end is electrically connected to the drive unit.

[0028] In some embodiments, the test bench is used to generate test voltages of different amplitudes and frequencies, and to transmit and receive feedback optical signals. The test bench calculates whether the IGCT module is functioning correctly by measuring current, voltage, and feedback pulse width.

[0029] Testers can set the corresponding parameters and select the test items to be performed on the test bench screen. After starting, the test bench will automatically perform the test and display the results on the screen.

[0030] For example, the test handle structure is customized based on the three-dimensional model of the HCC converter valve and designed according to the IGCT module. Testers can attach the handle to the IGCT module to start the test.

[0031] In some embodiments, the triggering fiber is used to transmit pulses generated by the test bench to the drive unit, and the return fiber is used to receive different return pulses generated by the drive unit to the test bench.

[0032] In some embodiments, two damping resistors Rs are provided, including a first damping resistor Rs1 and a second damping resistor Rs2.

[0033] In some examples, the first end of the static equalizing resistor Rd is electrically connected to the first node N1, and the second end of the static equalizing resistor Rd is electrically connected to the second node N2.

[0034] For example, the static equalizing resistor Rd has a resistance of 88kΩ and a precision of 2%.

[0035] The main function of the static equalizing resistor Rd is: 1) Provides measurement sampling of IGCT module voltage for the IGCT integrated control unit; 2) Ensure that the DC voltage component across the HCC converter valve is evenly distributed across both ends of each IGCT module.

[0036] In some examples, the first end of the first damping resistor Rs1 is electrically connected to the first node N1, the second end of the first damping resistor Rs1 is electrically connected to the first end of the damping capacitor Cs, the second end of the damping capacitor Cs is electrically connected to the first end of the second damping resistor Rs2, and the second end of the second damping resistor Rs2 is electrically connected to the third node N3.

[0037] For example, the resistance of the first damping resistor Rs1 and the second damping resistor Rs2 is 24Ω with a precision of 2%, and the capacitance of the damping capacitor Cs is 2.2uF with a precision of 3%.

[0038] The first damping resistor Rs1, the second damping resistor Rs2, and the damping capacitor Cs form an RC damping circuit, whose main function is: 1) Ensure that the AC voltage of the converter valve is evenly distributed across each IGCT; 2) Provides operating power to the IGCT integrated control unit; 3) Limit the reverse recovery voltage overshoot when the IGCT is turned off; 4) Provide anode injection current during the turn-on phase.

[0039] This invention also provides a method for testing the active shut-off function of an HCC converter valve, using the testing apparatus described above, including steps S100-S300, as follows: Figure 4 As shown, the test method is used to measure whether the active shutdown function of the IGCT integrated control unit is normal.

[0040] S100, the test equipment performs high-voltage protection trigger test on the IGCT integrated control unit.

[0041] S200: 300-500us after the GCT element is turned on, the test equipment sends a 5±1us turn-off signal to the drive unit and detects the turn-off report light pulse of the drive unit.

[0042] S300, if the test equipment detects the shutdown report light pulse, then perform a low-voltage trigger test on the IGCT integrated control unit.

[0043] In the active shutdown function test method, if the following conditions are met, the active shutdown function of the IGCT integrated control unit is judged to be normal.

[0044] Basis for judgment: 1) The high-voltage protection trigger test result is normal; 2) The pulse width of the feedback received by the test equipment is t = 5 ± 1 μs; 3) The low-voltage trigger test results are normal.

[0045] In some embodiments, such as Figure 5 As shown, the high-voltage protection trigger test includes steps S110-S130. The high-voltage protection trigger test is used to measure whether the high-voltage protection trigger function of the IGCT integrated control unit is normal.

[0046] S110, the test equipment continuously applies a certain amount of AC voltage to the IGCT integrated control unit, and after a certain period of time, the drive unit can reach the rated value.

[0047] For example, the test equipment continuously applies an AC voltage of 380V to the IGCT integrated control unit, and the drive unit draws power to the rated value after 4 seconds.

[0048] S120, the test equipment applies an impulse voltage to the IGCT integrated control unit to detect whether the GCT element is conducting and to detect the width of the feedback pulse sent by the drive unit.

[0049] For example, the above-mentioned impulse voltage is an impulse voltage with a maximum peak voltage of 8500V and a wavefront of 100µs.

[0050] S130, after the impulse voltage has been applied for a certain period of time, perform another low-voltage trigger test.

[0051] For example, a low-voltage trigger test is performed again 80ms after the impulse voltage is applied.

[0052] In the high-voltage protection trigger test method, if the following conditions are met, the high-voltage protection trigger function of the IGCT integrated control unit is judged to be normal.

[0053] Basis for judgment: 1) The GCT element is turned on and the peak voltage U = 7600V ± 200V; 2) The pulse width of the report is t = 30 ± 1 μs; 3) The low-voltage trigger test results are normal.

[0054] In some embodiments, such as Figure 6 As shown, the low-voltage trigger test includes steps S310-S320. The low-voltage trigger test is used to measure whether the triggering function of the IGCT integrated control unit is normal.

[0055] S310: The test equipment continuously applies a certain amount of power frequency AC voltage to the IGCT integrated control unit. After a certain period of testing, the drive unit reaches the rated value.

[0056] For example, the test equipment continuously applies an effective value of 380V AC power frequency to the IGCT integrated control unit. Four seconds after the start of the test, the drive unit reaches the rated value.

[0057] S320, the test equipment detects the feedback light pulses sent by the drive unit. After receiving multiple feedback light pulses in a certain period of time, the test equipment immediately sends a light trigger pulse to the drive unit and detects whether the GCT element is conducting.

[0058] For example, after receiving three consecutive report light pulses within 60ms, the test device immediately sends a 10±1us light trigger pulse to the drive unit and detects whether the GCT element is conducting.

[0059] In the low-voltage trigger test method, if the following conditions are met, the triggering function of the IGCT integrated control unit is judged to be normal.

[0060] Basis for judgment: 1) The test equipment receives the optical pulse sent by the drive unit within the voltage U=32±10V of the IGCT integrated control unit; 2) The width of the return light pulse is t = 10 ± 1 μs; 3) The GCT element is turned on (the loop current is higher than the rated value).

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A testing device for the active shut-off function of an HCC converter valve, characterized in that: The HCC converter valve consists of multiple IGCT modules connected in series. Each IGCT module includes: The IGCT integrates a control unit, damping resistors, damping capacitors, and static voltage equalization resistors. The IGCT integrated control unit and the static voltage equalization resistor are connected in parallel, and are connected in series with the damping resistor and the damping capacitor in sequence; The IGCT integrated control unit includes: a drive unit and GCT components; The anode of the GCT element is electrically connected to the first node, and the cathode and gate of the GCT element are both electrically connected to the driving unit. The driving unit is also electrically connected to the second node and the third node, respectively. The testing apparatus includes a testing device connected in parallel with the IGCT module, used to test the active shutdown function of the IGCT integrated control unit.

2. The HCC converter valve active shut-off function testing device as described in claim 1, characterized in that, The testing equipment includes a trigger fiber, a return fiber, and a test stand and test handle connected in series. One end of the trigger fiber and the return fiber are electrically connected to the test bench, and the other end is electrically connected to the drive unit. The test stand is used to generate test voltages of different amplitudes and frequencies, and to send and receive feedback optical signals. The triggering optical fiber is used to transmit the pulses generated by the test bench to the drive unit; The feedback fiber is used to receive different feedback pulses generated by the driving unit to the test station.

3. The HCC converter valve active shut-off function testing device as described in claim 1, characterized in that, Two damping resistors are provided, including a first damping resistor and a second damping resistor; The first end of the static voltage equalization resistor is electrically connected to the first node, and the second end of the static voltage equalization resistor is electrically connected to the second node; The first end of the first damping resistor is electrically connected to the first node, the second end of the first damping resistor is electrically connected to the first end of the damping capacitor, the second end of the damping capacitor is electrically connected to the first end of the second damping resistor, and the second end of the second damping resistor is electrically connected to the third node.

4. A method for testing the active turn-off function of an HCC converter valve, using a test device according to any one of claims 1 to 3, characterized in that: Includes the following steps: S100, the test equipment performs a high-voltage protection trigger test on the IGCT integrated control unit; S200, 300~500us after the GCT element is turned on, the test equipment sends a 5±1us turn-off signal to the drive unit and detects the turn-off report light pulse of the drive unit at the same time. S300, if the test equipment detects the shutdown report light pulse, then a low-voltage trigger test is performed on the IGCT integrated control unit.

5. The test method for the active shut-off function of the HCC converter valve as described in claim 4, characterized in that, The high-voltage protection trigger test includes the following steps: S110, the test equipment continuously applies a certain amount of AC voltage to the IGCT integrated control unit, and after a certain period of time, the drive unit can reach the rated value. S120, the test device applies impulse voltage to the IGCT integrated control unit, detects whether the GCT element is turned on, and detects the width of the return pulse sent by the drive unit; S130, after the impulse voltage is applied for a certain period of time, the low-voltage trigger test is performed again.

6. The test method of the HCC converter valve active shutdown function according to claim 4 or 5, characterized in that, the low-voltage trigger test comprises the following steps: S310, the test device continuously applies a certain amount of power frequency alternating voltage to the IGCT integrated control unit, and after a certain period of time of testing, the drive unit reaches the rated value; S320, the test device detects the return light pulse sent by the drive unit, and immediately sends a light trigger pulse to the drive unit after continuously receiving multiple return light pulses within a certain period of time, and detects whether the GCT element is turned on.

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