超静止セルビウス方式における力率改善

概要

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Low power factor is a large defect of the static Scherbius system in which the ordinary thyristor bridges are used. It is based on the oparation of the thyristor bridges within the positive range of the control angle. But, the ordinary thyristor bridge cannot operate within the negative range of the control angle because it depends on the natural commutation. If we use the thyristor bridge furnished with commutating capacitors and series diodes, we can obtain the commutating voltage over the whole range of the control angle from positive to negative through zero. When these bridges are applied to the static Schebius system and are oprated within the negative range of the control angle, we can not only obtain the speed control over the double range from below to above through the synchronous speed, but also we can accomplish the remarkable improvement of its power factor, occasionally, it is possible to obtain even the leading power factor.
山梨大学の論文