A NEW APPROACH TO IMPROVE POWER-FACTOR AND REDUCE HARMONICS IN A 3-PHASE DIODE RECTIFIER TYPE UTILITY INTERFACE
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In this paper a new approach to improve power factor and reduce harmonics generated by a three phase diode rectifier type utility interface is proposed. The proposed approach is passive and consists of a novel interconnection of a star/delta transformer between the ac and dc sides of the diode rectifier topology (see Fig. 1). This novel interconnection, in combination with the 120 degree conduction intervals of each diode, is shown to generate a circulating third harmonic current between the ac and dc side of the rectifier bridge. The circulating third harmonic current is then shown to drastically improve the performance of the diode rectifier type interface. The resulting input current is near sinusoidal in shape with significant reduction in line current harmonics. The proposed system can be viewed as a cost effective retrofit to the existing diode rectifier utility interface applications. Analysis and design of the proposed approach is examined in per-unit quantities. A suitable design example illustrates the sizing of the necessary passive components. Selected results are verified experimentally on a laboratory proto-type system.
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Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting
