Design of snubber circuit for the 4500 V/4000 A GTOs in a 20 MVA STATCOM

Author

Qiang, Song ; Wenhua, Liu ; Zhiyong, Wang ; XiZheng, Chen ; Peifeng, Xu

Author_Institution

Dept. of Electr. Eng., Tsinghua Univ., Beijing, China

Volume

2

fYear

2000

fDate

2000

Firstpage

875

Abstract

This paper analyzes the generation process of the overvoltages V _DSP V_DM and V_R during the turn-off process of GTO and the measures to suppress the overvoltages. Through analyses of the features of conventional RCD snubber circuit and three kinds of low-loss snubber circuit, the snubber circuit for the 4500 V/4000 A GTOs in a 20 MVA STATCOM installation is proposed. The snubber circuit is the low-loss Δ-type snubber circuit with a clamping capacitor. Experimental results demonstrate that the proposed snubber circuit is very effective for large capacity two-level GTO inverter

Keywords

overvoltage protection; power capacitors; snubbers; static VAr compensators; thyristor convertors; 20 MVA; 4000 A; 4500 V; GTO turn-off process; RCD snubber circuit; STATCOM; clamping capacitor; low-loss Δ-type snubber circuit; overvoltage generation process; overvoltage suppression; snubber circuit design; two-level GTO inverter; Automatic voltage control; Capacitors; Circuits; Energy loss; Inductance; Inverters; Joining processes; Power system stability; Snubbers; Surges;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics and Motion Control Conference, 2000. Proceedings. IPEMC 2000. The Third International

Conference_Location

Beijing

Print_ISBN

7-80003-464-X

Type

conf

DOI

10.1109/IPEMC.2000.884624

Filename

884624