Bypass operation by cyclic firing of the bridge thyristors
作者:
Z.Zabar,
G.Bronner,
期刊:
Proceedings of the Institution of Electrical Engineers
(IET Available online 1979)
卷期:
Volume 126,
issue 9
页码: 833-836
年代: 1979
DOI:10.1049/piee.1979.0258
出版商: IEE
数据来源: IET
摘要:
By passing of a thyristor bridge is being used in large convertor systems such as in h.v.d.c. transmission lines for fault conditions. In normal voltage-control operation, an increase in the total power factor of the whole convertor system can be achieved by relieving a few bridges from current by using external bypass valves. However, a fully rated external bypass valve is relatively expensive because it has to carry continuously the full direct current. A novel way of continuous operation of the bridge thyristors in a cyclic firing method is described in the paper. This method allows the designer to eliminate the external bypass valve and still get the bypass mode of operation.
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