By-passing of a thyristor bridge is used in large converter systems such as in hvdc 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. This method allows the designer to eliminate the external bypass valve and still get the bypass mode of operation.
|Original language||English (US)|
|Number of pages||4|
|Journal||Proceedings of the Institution of Electrical Engineers|
|State||Published - 1979|
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