Experimental analysis of inverter performance under nonlinear loads
Department of Electronics and Communication Engineering, Government Residential Polytechnic for Women’s, Shimoga, Karnataka, India.
Research Article
World Journal of Advanced Research and Reviews, 2021, 10(01), 438-445
Article DOI: 10.30574/wjarr.2021.10.1.0192
Publication history:
Received on 16 April 2021; revised on 27 April 2021; accepted on 29 April 2021
Abstract:
This paper presents a comprehensive experimental analysis of a standard single-phase PWM inverter's performance when supplying nonlinear loads. The proliferation of electronic equipment, such as switched-mode power supplies and variable-speed drives, introduces significant harmonic currents into power systems. These harmonics severely degrade the quality of the output voltage from inverters, which are critical components in renewable energy and uninterruptible power supply (UPS) systems. This study constructs a laboratory-scale testbed comprising a DC source, a full-bridge MOSFET-based inverter with sinusoidal PWM control, an LC output filter, and two distinct nonlinear loads: a diode bridge rectifier with capacitive filtering and a triac-based dimmer circuit. Performance metrics, including Total Harmonic Distortion (THD), voltage regulation, and inverter efficiency, are measured and analyzed under both linear (resistive) and nonlinear loading conditions. The results conclusively demonstrate a substantial increase in output voltage THD from <2% under linear load to over 8% under severe nonlinear loading, alongside a measurable decrease in efficiency. The paper concludes with a discussion on mitigation strategies, underscoring the necessity of advanced control techniques and harmonic filtering in modern inverter design.
Keywords:
Inverter, Nonlinear Load; Total Harmonic Distortion (THD); Harmonic Analysis; Pulse Width Modulation (PWM); Power Quality
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Copyright © 2021 Author(s) retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution Liscense 4.0