Modified SEPIC with Boost Converter based Power Factor Correction for Single-Phase Induction Motor Drive

Authors

  • Jethose Vijayakumar, Manoharan Subramanian

Abstract

This paper presents a novel unified method for power factor improvement of single-phase induction motor. Unlike conventional methods of PFC based SPIM, a closed loop control scheme is proposed which utilizes the unutilized active power generated in the magnetically coupled auxiliary winding during running condition using a boost converter with average current control. A modified SEPIC operating in continuous conduction mode (CCM) is used to reduce the input inductor current ripple and to improve the static gain. The higher static gain benefits to operate with a low input voltage with low duty-cycle value in all range of the input voltage. Low duty cycle results in reduced switching losses. In addition to it, a boost converter is used for the management of reactive power by utilizing active auxiliary winding power with a closed loop control to improve the performance of the SPIM. The auxiliary stator current is made to follow a pre-determined sinusoidal wave to achieve reactive power compensation. To verify the feasibility of the modified SEPIC converter based SPIM drive converter with reconversion boost converter, a 2 kW converter is designed to operate from 100 V(rms) input line providing 330 V(dc) DC bus voltage. A comparative analysis is made to examine the influence of auxiliary winding power in the improvement of power factor and performance. The simulation result obtained from the MATLAB/Simulink model is validated and it is found that the proposed SPIM drive achieved a sensible power factor improvement, reduced THD, and increased efficiency.

Published

2020-03-31

Issue

Section

Articles