Trigger method of auxiliary valve in a short circuit current test apparatus

A test device and short-circuit current technology, applied in measuring devices, measuring current/voltage, measuring electrical variables, etc., can solve the problems of long protection action time and inability to shut off overcurrent by itself

Inactive Publication Date: 2012-09-26
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the actual operation of flexible DC and other high-power power electronic devices based on turn-off device valves, due to system failures, DC side grounding faults, etc., the diode overcurrent of the lower side IGBT in the sub-module will occur. , cannot turn off the overcurrent by itself, and because the system protection takes a long time, the diode must withstand the overcurrent during the fault, but because the overcurrent during the fault will far exceed the withstand value of the device itself, it must be passed through the sub-module The protective thyristor connected in anti-parallel with the lower side IGBT operates and shares most of the overcurrent to achieve the purpose of protecting the device itself and the device

Method used

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  • Trigger method of auxiliary valve in a short circuit current test apparatus
  • Trigger method of auxiliary valve in a short circuit current test apparatus
  • Trigger method of auxiliary valve in a short circuit current test apparatus

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Embodiment Construction

[0038] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] like figure 1 as shown, figure 1 It is an electrical structure diagram of the MMC valve provided by the present invention, and the MMC valve includes an auxiliary sub-module and a sample sub-module.

[0040] Auxiliary sub-module includes capacitor C SM1 , switch K 1 , resistance R 1 , IGBT device T 11 and T 12 and the diode D 11 and D 12 ; Diode D 11 Anti-parallel IGBT device T 11 Composed of IGBT module 1, diode D 12 Anti-parallel IGBT device T 12 Form IGBT module 2, IGBT module 1 and IGBT module 2 are connected in series, switch K 1 Connect in parallel with capacitor C in series with R1 SM1 ends.

[0041] The sample sub-module includes capacitor C SMn , switch K n , resistance R n , IGBT device T n2 and T n1 and the diode D n1 and D n2 ; Diode D n1 Anti-parallel IGBT device T n1 Composed o...

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Abstract

The invention relates to a trigger method of auxiliary valve in a short circuit current test apparatus. Steps of the method are as following: at t0 moment the auxiliary valve is triggered and bidirectional thyristor auxiliary valves are not triggered; the bidirectional thyristor auxiliary valves are triggered at t1 moment; tested valves are triggered at (t1+delta t1) moment; auxiliary valve of turn-off device is triggered at t2 moment; trigger pulse of the auxiliary valve, the bidirectional thyristor auxiliary valves and the auxiliary valve of turn-off device are locked out at (t1+delta t2) moment, and simultaneously the bidirectional thyristor auxiliary valves are triggered; and triggering of the bidirectional thyristor auxiliary valves is continuously carried out until the test ends. According to the method, exponential decay current, current stress superimposed by sine-wave current and voltage stress superimposed by reverse high voltage are respectively applied to a MMC valve of the tested converter valves, so that test to accident operation condition of the tested converter valves is realized.

Description

technical field [0001] The invention relates to a triggering method, in particular to a triggering method of an auxiliary valve in a short-circuit current test device. Background technique [0002] With the application of flexible direct current transmission (VSC-HVDC) technology in power systems, the reliability of its core component, the high-power high-voltage insulated gate bipolar transistor (IGBT) valve, has become the key to system safety. Since VSC-HVDC devices generally have the characteristics of high voltage, large current, and large capacity, it is difficult to construct a full-load circuit in the test environment that is the same as the actual operating condition for testing, so how to build an equivalent test circuit in the test environment , it is the key to solve the problem to carry out the test with the strength equivalent to the actual operating condition. [0003] VSC-HVDC based on modular multilevel converter (MMC) is a way to realize DC transmission us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
Inventor 吴亚楠罗湘高冲查鲲鹏
Owner STATE GRID CORP OF CHINA
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