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36 3 Vol. 36 No. 3
2012 3 Power System Technology Mar. 2012
100003-0088-07 TM 72 TM 86 A 470·4051
—
1 1 1 1 2 2 2
1 310027 2 211100
Overvoltage Mechanism of Converter Valves for
HVDC Power Transmission Project From Tianshengqiao to Guangzhou
1 1 1 1 2 2 2
CHEN Xilei , ZHOU Hao , YUAN Shichao , WANG Dongju , TIAN Jie , HUANG Zhiling , LU Yu
(1. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, Zhejiang Province, China;
2. Nari-Relays Electric Co. Ltd., Nanjing 211100, Jiangsu Province, China)
ABSTRACT: Based on the HVDC power transmission project 2
from Tianshengqiao to Guangzhou the mechanism leading to 1
converter valve overvotage is analyzed and analysis results
show that overvoltage will appear at both terminals of the 2
valves under two conditions: the first one is that after Y/Y
turning-off all valves in uppermost layer of commutating group 2
overvoltages appear at both terminals of the valves belonging
to this layer, whereas when all valves belonging to other layers Y/Y
of commutating groups are turned-off there in general will not
be overvotlages appearing at both terminals of these valves; the
second one is that the switching surge due to interphase
operation in AC-system
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