Title :
A new approach to improve power factor and reduce harmonics in a three phase diode rectifier type utility interface
Author :
Kim, S. ; Enjeti, P. ; Packebush, P. ; Pitel, I.
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
A novel approach to improving power factor and reducing harmonics generated by a three-phase diode-rectifier-type utility interface is proposed. This approach is passive and consists of a novel interconnection of a star/delta power transformer between the AC and DC sides of the diode rectifier topology. This interconnection, in combination with the 120° conduction intervals of each diode, is shown to generate a circulating third-harmonic current between the AC and DC side of the rectifier bridge. This current is shown to drastically improve the performance of the diode-rectifier-type interface. The resulting input current is near-sinusoidal, 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. A design example illustrates the sizing of the necessary passive components. Selected results were verified experimentally on a laboratory prototype system
Keywords :
bridge circuits; power convertors; power factor correction; power system harmonics; power transformers; rectifying circuits; semiconductor diodes; semiconductor switches; conduction intervals; cost-effective retrofit; design; passive components; performance; power factor; power system harmonics; rectifier bridge; sizing; star/delta power transformer; three phase diode rectifier; topology; utility interface; AC generators; Bridges; DC generators; Diodes; Power generation; Power system harmonics; Power transformers; Reactive power; Rectifiers; Topology;
Conference_Titel :
Industry Applications Society Annual Meeting, 1993., Conference Record of the 1993 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-1462-X
DOI :
10.1109/IAS.1993.299019
