Title: An asymmetrical isolated AC-DC converter stationed BLDC motor drive to mitigate power quality issues

Authors: Tanmay Shukla; N.P. Patidar

Addresses: Maulana Azad National Institute of Technology, Bhopal, 462003, India; Prestige Institute of Management and Research, Bhopal, 462022, India ' Maulana Azad National Institute of Technology, Bhopal, Madhya Pradesh, 462003, India

Abstract: The current article suggests the use of an isolated AC-DC converter for a BLDC motor driver to meet power quality guidelines of IEC/IEEE standards. Due to asymmetry in isolated converter, the converter functions differently in positive cycle (PC) and negative cycle (NC) of source voltage. The PC converter is isolated SEPIC however, a two-order isolated buck-boost works during NC. The usage of two different converters for PC and NC eliminates the requirement of bridge rectifier and also lowers average current across different electrical elements. The present work explains the null current switching (NCS) mode design and operation of asymmetrical converter. The use of NCS mode reduces the sensor requirement. Elaborated mathematics, state space models, and stability analysis of converter are added in the article to check stability of the presented converter. Simulation results of the system under different conditions are presented and studied to verify the system.

Keywords: AC-DC converter; positive cycle; PC; negative cycle; NC; null current switching; NCS; mode.

DOI: 10.1504/IJPELEC.2024.142632

International Journal of Power Electronics, 2024 Vol.20 No.4, pp.373 - 396

Received: 12 Mar 2024
Accepted: 31 Aug 2024
Published online: 12 Nov 2024 *

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