制御角正負全域で動作するサイリスタブリッジ

概要

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Commutation voltage of the 3-phase thyristor bridge was investigated. Three circuits of the bridge were considered. Each of them has two thyristors in their main current path, and acts as a rectifier within the control angle of retardation from positive to negative, and as a inverter within the control angle of advance from positive to negative. The first circuit was equipped with both commutating capacitor and reverse parallel thyristor between the phases. In this circuit, there are two faults, namely, the commutation voltage rises abnormally, and the spike current flows out into the AC lines every commutation. The second one was added small saturable reactors and resistors to improve that faults. But, it is impossible to suppress completely outflow of the spike current into the AC lines. The third one was a modification of the first one. One end of the reverse parallel thyristor was changed to connect to another points, and thus that faults were improved. This coincides with one of the circuit which has been used only as a self excited inverter up to this time. Consequently, the expansion of utilization of that thyristor bridge, over the whole control angle from positive to negative, could be predicted.
山梨大学の論文