Title: Development and experimental validation of fault detection and diagnosis method in SPWM modulated symmetric cascaded H-bridge multilevel inverter

Authors: Nithin Raj; Anjali Anand; G. Jagadanand; Saly George

Addresses: Department of Electrical and Electronics Engineering, Government Polytechnic College Palakkad, Kerala, India ' Department of Electrical and Electronics Engineering, Government College of Engineering Kannur, Kerala, India ' Department of Electrical and Electronics Engineering, National Institute of Technology Calicut, Kerala, India ' Department of Electrical and Electronics Engineering, National Institute of Technology Calicut, Kerala, India

Abstract: This paper discusses gate open-circuit fault detection and diagnosis method in SPWM modulated symmetric cascaded H-bridge multilevel inverter. First, an output voltage modelling under fault condition in cascaded H-bridge multilevel inverter is presented. Further, simulations of fault conditions have been carried out for the development of the fault detection and diagnosis method. Based on fault modelling and simulations, a fault detection and diagnosis method have been proposed based on the mean values of the bridge voltages as the diagnostic feature. Further, the proposed method has been validated experimentally on a 5-level symmetric sine pulse width modulated cascaded H-bridge multilevel inverter.

Keywords: cascaded H-bridge; CHB; fault detection and diagnosis; FDD; fault modelling; gate open-circuit fault; sine pulse width modulation; SPWM; multilevel inverter; MLI.

DOI: 10.1504/IJPELEC.2020.106229

International Journal of Power Electronics, 2020 Vol.11 No.3, pp.409 - 426

Received: 16 Sep 2017
Accepted: 06 Jan 2018

Published online: 30 Mar 2020 *

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