[Oral Presentation]Analysis and Solution of Voltage Overshoot of Keep-Off State Devices in Three Level Simplified Neutral Point Clamped Inverter

Analysis and Solution of Voltage Overshoot of Keep-Off State Devices in Three Level Simplified Neutral Point Clamped Inverter

ID：115 Submission ID：89 View Protection：ATTENDEE Updated Time：2022-10-11 11:32:25 Hits：522 Oral Presentation

Start Time：2022-11-04 10:40 （Asia/Shanghai）

Duration：20min

Session：[E] Power Electronics Technology and Application » [OS6] Oral Session 6

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Abstract

This paper demonstrates a unique voltage overshoot phenomenon of keep-off state devices in three level simplified neutral point clamped (3L-SNPC) inverter which comprises a DC-DC chopper and a three-phase two-level (2L) inverter. The issue is found to be related to the switching action of the DC-DC chopper and will introduce voltage overshoot on the constant keep-off state devices in the 2L-inverter. The switching transients of different switching cases are analyzed to reveal the mechanism of the voltage overshoot phenomenon. Based on the analysis, a snubber circuit is used to suppress the voltage overshoot. Simulations using LTspice software validate the analysis and the solution.

Keywords

3L-SNPC, voltage overshoot, keep-off state devices, switching transients, snubber circuit

Speaker

Xinyue Guo

Huazhong University of Science and Technology；State Key Laboratory of Advanced Electromagnetic Engineering and Technology

Submission Author

Xinyue Guo Huazhong University of Science and Technology；State Key Laboratory of Advanced Electromagnetic Engineering and Technology

Menghu Liu Huazhong University of Science and Technology；State Key Laboratory of Advanced Electromagnetic Engineering and Technology

Jiajia Guan Huazhong University of Science and Technology；State Key Laboratory of Advanced Electromagnetic Engineering and Technology

Cai Chen Huazhong University of Science and Technology；State Key Laboratory of Advanced Electromagnetic Engineering and Technology

Yong Kang Huazhong University of Science and Technology;School of Electrical and Electronic Engineering

Rui Li Wuhan Second Ship Design and Research Institute

Jiuqing Cai Wuhan Second Ship Design and Research Institute

Xiang Jin Wuhan Second Ship Design and Research Institute

Peng Li Wuhan Second Ship Design and Research Institute

Jing Chen Wuhan Second Ship Design and Research Institute

Lei Yang Beijing Institute of Precision Mechatronics and Controls