Title: Decoupled control of quasi-Z source inverter for decentralised renewable energy application

Authors: Arvind Yadav; Vinay Kumar Deolia; Sanjay Agrawal

Addresses: Department of Electrical Engineering, Institute of Engineering and Technology, GLA University, Mathura, India ' Department of Electronics and Communication Engineering, Institute of Engineering and Technology, GLA University, Mathura, India ' School of Engineering and Technology, IGNOU, New Delhi, India

Abstract: Decentralised renewable energy (DRE) systems are acclaimed worldwide as it serves as an alternate to the grid extension to remote areas having no access to electricity. The impedance source inverter (ZSI) has overcome the limitations of conventional voltage source inverter (VSI), have buck/boost capabilities. This paper presents an alternative approach of obtaining shoot-through pulses in a quasi-Z source inverter (qZSI) along with decoupled control by keeping dc link voltage constant instead of capacitor voltage. Dynamics of the system are investigated by deriving small signal model, the proposed control methodology uses separate controllers to handle dc and ac side dynamics to get desired shoot-through pulse and modulation index without any overlap, performance of the control methodology is verified under normal condition and under disturbances. Results are obtained using PSIM which verifies the control methodology and depicts the ability of disturbance rejection and effective reference tracking without compromising stability issues.

Keywords: DRE system; photovoltaic; PV module; quasi-Z source inverter; qZSI; shoot-through; ST; decoupled control.

DOI: 10.1504/IJPELEC.2021.116646

International Journal of Power Electronics, 2021 Vol.14 No.1, pp.37 - 55

Received: 21 Aug 2018
Accepted: 03 Jan 2019
Published online: 29 Jul 2021 *

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