進む電流をとるサイリスタブリッジ整流器の動作

概要

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As for an ordinary thyristor bridge, it is impossible to act as a rectifier within a negative range of the angle of retardation, because it depends on the natural commutation. But if there are some leakage inductances at A. C. side, and suitable commutating condensers are provided in the bridge by means of the series diode system, the commutating voltages may be obtained within a negative range of the angle of retardation as well as the positive range, thus we can make it operate as a rectifier within that range. The rectifier action within a positive range of the angle of retardation causes a lagging current from an A. C. source, but on the other hand the rectifier action within a negative range of the angle of retardation demands a leading current from A. C. source. If we use such a rectifier bridge as causes a leading current from the A. C. source, we can have not only rectifier action, but also contribute to improve the power factor of the power system. Analyzing the action of this bridge, we obtained the expression about the commutating voltage, output voltage, input current, input power, displacement factor, total power factor etc. The calculated results by these expressions agree well with the experimental results. Furthermore, from the point of view of reducing the responsibility for withstand voltage to the thyristor, I will refer to the reduction method of the commutating voltage.
山梨大学の論文