A Study of Cycloconverter Gating Sequence and Control Strategy for Various Conversion Topology

Abstract

This paper presents the topology of direct conversion of AC-AC with step down frequency operation. Due to the higher order harmonics, AC conversion always faces difficulty and complex calculation, which affects the output response. Precise controlling and harmonics reduction is much easier using frequency control strategy. In this regards cycloconverter has drawn higher attention in terms of frequency conversion. In this paper, an approach for designing of single phase and three phase cycloconverter is reported. The gating sequence has been designed for desired frequency conversion. Again, the performance of the designed converters is evaluated using Matlab/Simulink software for different types of loads. The rotor speed of induction motor (IM) is observed here as a dynamic AC load. The complete description of the models for the frequency conversion is provided and simulation results for resistive, inductive and motor validate the developed strategy.

Keywords: Cycloconverter, frequency conversion, firing angle, induction motor, harmonics