Application of Pulse Doubling in Polygon-Connected Autotransformer Based 28-Pulse AC-DC Converter for Power Quality Improvement

Abstract – This paper presents a pulse doubling technique in a Polygon-Connected autotransformer based 28-pulse ac-dc converter which supplies direct torque controlled motor drives (DTCIMDs) in order to have better power quality conditions at the point of common coupling. The proposed technique increases the number of rectification pulses without significant changes in the installations and yields in harmonic reduction in both ac and dc sides. The 28-pulse rectified output voltage is accomplished via two paralleled 14-pulse ac-dc converters each of them consisting of seven-phase diode bridge rectifier. An autotransformer is designed to supply the rectifiers. The design procedure of magnetics is in a way such that makes it suitable for retrofit applications where a six-pulse diode bridge rectifier is being utilized. Independent operation of paralleled diode-bridge rectifiers, i.e. dc-ripple re-injection methodology, requires a Zero Sequence Blocking Transformer (ZSBT). Finally, a tapped interphase reactor is connected at the output of ZSBT to double the pulse numbers of output voltage up to 56 pulses. The aforementioned structure improves power quality criteria at ac mains and makes them consistent with the IEEE-519 standard requirements for varying loads. Furthermore, near unity power factor is obtained for a wide range of DTCIMD operation. A comparison is made between 6-pulse, 28-pulse, and proposed converters from view point of power quality indices. Results show that input current total harmonic distortion (THD) is less than 3% for the proposed topology at variable loads.

Reviews AC–DC converter, polygon autotransformer, power quality, 56-pulse rectifier, Pulse Doubling, direct torque controlled induction motor drive