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Research Article |

Digital Hysteresis Control Algorithm for Switched Inductor Quasi Z-Source Inverter with Constant Switching Frequency

Author(s): V. Malathi1, Dr. S. Sentamil Selvan2 and Dr. S. Meikandasivam3

Published In : International Journal of Electrical and Electronics Research (IJEER)        Volume 10, Issue 3

Publisher : FOREX Publication

Published : 07 September 2022

e-ISSN : 2347-470X

Page(s) : 572-578

DOI: https://doi.org/10.37391/IJEER.100327

Abstract

In this paper, a digital hysteresis current limit controller is developed for Switched Inductor Quasi Z-Source Inverter (SLQZSI). Traditional methods like hysteresis current fixed limit and adjustable hysteresis current limit techniques changes the hysteresis bandwidth in accordance to modulating frequency and gradient of reference current. The operating shifting frequency of typical approaches oscillates and crosses the intended steady shifting frequency under noise. It leads to undesirable heavy interference between the phases and more power loss. In the planned digital hysteresis current limit technique, the hysteresis current limit is calculated by resolving the optimization problem. In the proposed approach the operating shifting frequency is kept same or inferior to the intended steady shifting frequency even under noise. Hence the planned digital hysteresis current limit algorithm maintains the output current steady and power loss is minimized which is not promised by the conservative techniques. To compare different control strategies in terms of nature of operating switching frequency and harmonic performance simulations are built on the MATLAB/SIMULINK

Keywords: Digital Control, Hysteresis Control, Optimization problem, SLQZSI, Switching frequency, Total Harmonic Distortion




V. Malathi, Research Scholar, Department of EEE, Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya, Kanchipuram, India; Email: vmalathi@kanchiuniv.ac.in

Dr. S. Sentamil Selvan, Associate Professor, Department of EEE, Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya, Kanchipuram, India; Email: sentamilselvan.s@kanchiuniv.ac.in

Dr. S. Meikandasivam, Associate Professor, School of Electrical Engineering, VIT University, Vellore, India; Email: meikandasivam.s@vit.ac.in

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V. Malathi, Dr. S. Sentamil Selvan and Dr. S. Meikandasivam (2022), Digital Hysteresis Control Algorithm for Switched Inductor Quasi Z-Source Inverter with Constant Switching Frequency. IJEER 10(3), 572-578. DOI: 10.37391/IJEER.100327.