Abstract

This paper describes a method to compensate reactive power in the utility line, which is generated from electric and electronic apparatus of home appliance, by using a series-resonant high-frequency linked DC-AC converter aiming at development of a small sized active filter. The distortion of voltage and current waveforms due to the large number of small size home applieances used, becomes as large as we can not neglect it. Therefore, for reducing the distortion of voltage and current waveforms in the utility line, it is necessary to develop a small sized active filter.
We adopted a series-resonant high-frequency linked DC-AC converter as a converter used in the reactive power compensator because it is possible to use smaller passive circuit elements, such as an isolation transformer.
In this paper, the equivalent circuit which describes the macro-scopic behavior of the converter is derived. Then, on the basis of the equivalent circuit of converter, a method of the output current control of the converter in order to compensate the reactive power is described. Usefulness of the proposed method is confirmed by the experimental results of the current control and the reactive current compensation.