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An MMC power module protection thyristor transition voltage automatic test device and method

An automatic test device and technology of turning voltage, applied in the field of electric power, can solve the problems of protecting the deviation of turning voltage of thyristor screen, and achieve the effect of reducing the probability of forced outage, reducing the loss of damage and improving reliability.

Active Publication Date: 2020-11-20
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the current test method of the breakover voltage of the protection thyristor is inconsistent with the actual operating conditions of the power module, resulting in a large deviation of the breakover voltage of the protection thyristor, the embodiment of the present invention provides an automatic test device for the breakover voltage of the MMC power module protection thyristor and methods

Method used

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  • An MMC power module protection thyristor transition voltage automatic test device and method
  • An MMC power module protection thyristor transition voltage automatic test device and method
  • An MMC power module protection thyristor transition voltage automatic test device and method

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Embodiment 1

[0060] refer to figure 1 As shown, it is a test schematic diagram of the MMC power module protection thyristor breakover voltage automatic test device provided in this embodiment. The device mainly includes a power supply, a transformer T, a rectifier bridge, an IGBT full-bridge inverter, an electric heating fixture 1, and a voltmeter. 2. Ammeter 3, rectifier bridge controller 4, IGBT controller 5 and temperature controller 6.

[0061] Wherein, the power supply in this embodiment adopts U, V, W three-phase power supply, and the transformer T adopts a step-up transformer, the primary side of the transformer T is connected with the power supply, and the secondary side of the transformer T is connected with the rectifier The input terminals of the bridge are connected. Specifically, the rectifier bridge is composed of six diodes T1-T6 to output DC voltage to the IGBT full-bridge inverter; the IGBT full-bridge inverter outputs according to the control command Different voltage wa...

Embodiment 2

[0067] This embodiment provides a half-bridge power module protection thyristor breakover voltage testing method, the method is carried out by using the MMC power module protection thyristor breakover voltage automatic test device described in Embodiment 1, including:

[0068] Step 1: Set the maximum test voltage Vs, leakage current Is, and test temperature Ts of the thyristor Th under test on the man-machine interface;

[0069] Step 2: Install the thyristor T under test into the heating fixture and heat it to the test temperature Ts;

[0070] Step 3: Adjust the trigger angle of the rectifier bridge thyristor to 90°, so that the output voltage of the rectifier bridge is 0;

[0071] Step 4: The IGBT controller controls Q3 to keep on and Q2 to keep off;

[0072] Step 5: The IGBT controller controls Q1 to be turned on and Q4 to be turned off, keeping the set time T1;

[0073] Step 6: The IGBT controller controls Q1 to turn off, Q4 to turn on, and maintains the set time T2;

[...

Embodiment 3

[0083] This embodiment provides a full-bridge power module protection thyristor breakover voltage testing method, the method is carried out by using the MMC power module protection thyristor breakover voltage automatic test device described in Embodiment 1, including:

[0084] Step 1: Set the maximum test voltage Vs, leakage current Is, and test temperature Ts of the thyristor Th under test on the man-machine interface;

[0085] Step 2: Install the protection thyristor T into the heating fixture and heat it to the test temperature Ts;

[0086] Step 3: Adjust the trigger angle of the rectifier bridge thyristor to 90°, so that the output voltage of the rectifier bridge is 0;

[0087] Step 4: The IGBT controller controls Q1 and Q3 to be turned on at the same time, and Q2 and Q4 to be turned off at the same time, keeping the set time T3;

[0088] Step 5: The IGBT controller controls Q1 and Q3 to be turned off at the same time, and Q2 and Q4 to be turned on at the same time, keepi...

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Abstract

The invention discloses a device and method for automatically testing the transition voltage of thyristors protected by MMC power modules. device, IGBT controller and temperature controller. The MMC power module protection thyristor breakover voltage automatic test device provided by the present invention can respectively simulate the actual operating conditions of the protection thyristors in the out-of-control half-bridge power module and full-bridge power module, and realize the test voltage by automatically adjusting the trigger angle of the rectifier bridge Automatic and precise adjustment can accurately and automatically test the breakover voltage of the thyristor, so as to more accurately screen the thyristor suitable for the power module, reduce the damage loss of the power module caused by the breakdown of the IGBT component, and reduce the forced outage of the entire converter probability and improve the reliability of system operation.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to an automatic test device and method for the breakover voltage of a thyristor protected by an MMC power module. Background technique [0002] With the rapid development of flexible DC transmission technology, Modular Multilevel Converter (MMC) has been applied to engineering. This form of converter consists of thousands of power modules (topology see figure 1 , figure 2 ), if a certain power module is out of control (IGBT cannot be triggered) and the capacitor voltage rises, it will lead to overvoltage breakdown of the IGBT in the power module and form an open circuit state, eventually causing the entire converter to be forced to stop. Although a bypass switch is added at the port of the power module, when the module fails, the bypass switch is closed to bypass the faulty module. However, the bypass switch may have the problem of refusal to operate. In order to solve t...

Claims

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Application Information

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IPC IPC(8): G01R31/26
CPCG01R31/2601
Inventor 梁宁严喜林刘坤唐金昆张楠邹延生
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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