IGBT Series Voltage-sharing Characteristics of Hybrid Circuit Breaker in DC Micro-grid

被引：0
|
作者：
Leng T. [1 ]
Wang D. [1 ]
Liao M. [1 ]
Qiu J. [1 ]
Wang R. [1 ]
Zou J. [1 ]
机构：
[1] School of Electrical Engineering, Dalian University of Technology, Dalian
来源：
Gaodianya Jishu/High Voltage Engineering | 2020年 / 46卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Dynamic voltage-sharing; Hybrid DC circuit breaker; IGBT; Insulate gate bipolar transistors; Series-connected;
D O I：
10.13336/j.1003-6520.hve.20191007
中图分类号：
学科分类号：
摘要：
Series-connected insulation gate bipolar transistors (IGBTs) are applied to withstand the turnoff overvoltage in DC micro-grid hybrid circuit breaker. Thus, we investigated the series dynamic voltage-sharing of IGBTs. Firstly, we analyzed the causes of uneven dynamic voltage-sharing of IGBTs and the principle of RCD (resistor, capacitor, diode) snubber circuit. Then, we analyzed the voltage-sharing characteristic, overvoltage and turnoff loss of IGBTs, reverse voltage of diodes under different RCD circuit parameters by simulation. Finally, the 1.2 kV/2.4 kV power electronics interrupting unit with IGBTs in series was set up for verification. The short circuit current was 600 A, and the time difference between turn-off signals was 500 ns. The research indicates that, the larger the buffer capacitance in a certain range is, the smaller the overvoltage and turn-off loss of IGBTs will be, and the better the voltage-sharing will be; however, the excessive capacitance has a limited effect on the reduction of them. The larger the buffer resistance in a certain range is, the better the suppression of damped oscillation after turnoff of arrester will be; however, the reverse voltage of diodes will increase. The combined results of simulation and experiments show that the optimal circuit parameters of 2~3 μF buffer capacitance and 2 Ω buffer resistance are proposed, by which the principle of diode selection is given. The voltage-sharing characteristics of RCD snubber circuit are verified by investigation, which provides the technical reference for application in DC breaking. © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：3879 / 3886
页数：7
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