Method and apparatus to reduce distortion of currents...

Details Method and apparatus to reduce distortion of currents... Method and apparatus to reduce distortion of currents...

2004-06-04

2009-06-23

Ullah, Akm E (Department: 2838)

Electric power conversion systems

Current conversion

Having plural converters for single conversion

C363S070000, C363S085000

Reexamination Certificate

active

07551461

ABSTRACT:
AC/DC rectifiers are vital elements in industry. Their uses include HVdc electric energy transmission, uninterruptible power supplies (UPS), electrochemical plants, railway systems, variable speed induction motors, telephone plants, etc. Regrettably, currents IA, IBand ICon the primary side of the transformer feeding the rectifier are distorted, which is penalized worldwide. Conventionally, this distortion is reduced through an apparatus connected either on the primary or secondary side of the transformer. The proposed apparatus, however, is connected on the DC side of the rectifier. It is demonstrated in a laboratory prototype that this apparatus achieves notably low distortion levels (ideally zero) in currents IA, IBand IC, at low cost and with a simple and robust control system, which is capable of handling rapid load variations. It can also be repaired on line without the need to disconnect the system.

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