Carrier Migration and Recovery Characteristics Calculation of Converter Valve Thyristor and Its Turn-off Mechanism Considering Multi-dimensional Factors

被引：0
|
作者：
Jiang F. [1 ]
Guo C. [1 ]
Ye Y. [1 ]
Zhao C. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Changping District, Beijing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2023年 / 43卷 / 19期
关键词：
carrier migration and recovery characteristics; converter valve thyristor; forward current; thyristor junction temperature; zero-crossing decline rate of current;
D O I：
10.13334/j.0258-8013.pcsee.221023
中图分类号：
学科分类号：
摘要：
It is necessary to clarify the turn-off characteristics of thyristor in valve during AC fault at the inverter side to restrain commutation failure. The main factors affecting the turn-off process of thyristor are forward current, zero-crossing decline rate and junction temperature, etc. In order to clarify how the factors above comprehensively influence on turn-off characteristics, this paper firstly studies the turn-off process based on the turn-off model considering the physical characteristics of the device, and the equivalent circuit of turn-off process is then developed. And the relationship between various factors and the turn-off characteristics are researched. By calculating the carrier, the charge during the turn-off process is obtained. Finally, the blocking capacity recovery time for reliable turn-off and the residual charge at the end of commutation is given. The comprehensive effect of the factors on the turn-off process is quantitatively evaluated taking the blocking ability recovery time, critical margin angle, and etc., as indexes. The results indicate that, under the same commutation condition, when the fault leads to the increase of forward current, the blocking ability recovery time gets longer assuming that the effect of multi-dimensional factors is not considered, which will lead to higher turn-off requirements for the system. The blocking ability recovery time gets shorter if the effect of forward current and zero-crossing decline rate is the only factor considered, which may result in the misjudge of the commutation failure. Considering the comprehensive effect of above factors, the blocking ability recovery time is more accurate. © 2023 Chinese Society for Electrical Engineering. All rights reserved.
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页码：7605 / 7613
页数：8
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