Thyristor inverter with inverter bridge and common turn-off circuit for inverter thyristors

摘要

An inverter connection has an inverter bridge which, in series with a controllable valve, is connected between terminals for connection to a direct voltage source. A turn-off circuit is arranged for simultaneous turn off of the thyristors of the inverter. The turn-off circuit comprises a capacitor connection and a thyristor connection which is controllable in both directions. The latter is connected, in series with at least one capacitor, between a point which is located between the valve and the bridge, and at least one of the terminals. An inductor is arranged in at least two of the three current paths between said point and the terminals.