Z-Source-Based High Step-Up DC-DC Converters for Photovoltaic Applications

Abstract

This article proposes three high step-up Z-source (ZS)-based dc-dc converters by integrating the conventional ZS network with switched-capacitor (SC) cells. The proposed converters offer a simple structure with a smooth input current, a high-voltage gain, and low voltage stress on the semiconductor devices. In addition, the proposed converters, unlike some existing ZS-based topologies in the literature, do not impose any limitation on the duty cycle of the power switch. These characteristics make the proposed converters excellent candidates to interface a low-voltage solar photovoltaic (PV) panel with a high-voltage dc bus in PV applications. Among the proposed three converters, the operating principles and steady-state analysis of the one with more components are presented in detail. However, the steady-state voltage and current relationships are also tabulated for two other proposed converters. In addition, design considerations are presented. The performance of the proposed converters is compared against similar existing high step-up dc-dc converters with regards to the component count, normalized voltage stress on the power switch and diodes, and voltage gain. Finally, the theoretical analyses and calculations are validated through experimental results using a 400-W/400-V laboratory prototype.

Department(s)

Electrical and Computer Engineering

Keywords and Phrases

DC-DC Boost Converter; High Step-Up Dc-Dc Converter; Impedance Network; Renewable Energy; Solar Photovoltaic (PV); Switched-Capacitor (SC) Cell; Z-Source (ZS) Converter

International Standard Serial Number (ISSN)

2168-6785; 2168-6777

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2022 Institute of Electrical and Electronics Engineers, All rights reserved.

Publication Date

01 Aug 2022

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