Open Access

ARTICLE

A Novel Non-Isolated Cubic DC-DC Converter with High Voltage Gain for Renewable Energy Power Generation System

Qin Yao, Yida Zeng^*, Qingui Jia

School of Electrical Engineering, Southwest Jiaotong University, Chengdu, 610036, China

* Corresponding Author: Yida Zeng. Email:

Energy Engineering 2024, 121(1), 221-241. https://doi.org/10.32604/ee.2023.041028

Received 08 April 2023; Accepted 14 July 2023; Issue published 27 December 2023

Abstract

In recent years, switched inductor (SL) technology, switched capacitor (SC) technology, and switched inductor-capacitor (SL-SC) technology have been widely applied to optimize and improve DC-DC boost converters, which can effectively enhance voltage gain and reduce device stress. To address the issue of low output voltage in current renewable energy power generation systems, this study proposes a novel non-isolated cubic high-gain DC-DC converter based on the traditional quadratic DC-DC boost converter by incorporating a SC and a SL-SC unit. Firstly, the proposed converter’s details are elaborated, including its topology structure, operating mode, voltage gain, device stress, and power loss. Subsequently, a comparative analysis is conducted on the voltage gain and device stress between the proposed converter and other high-gain converters. Then, a closed-loop simulation system is constructed to obtain simulation waveforms of various devices and explore the dynamic performance. Finally, an experimental prototype is built, experimental waveforms are obtained, and the experimental dynamic performance and conversion efficiency are analyzed. The theoretical analysis’s correctness is verified through simulation and experimental results. The proposed converter has advantages such as high voltage gain, low device stress, high conversion efficiency, simple control, and wide input voltage range, achieving a good balance between voltage gain, device stress, and power loss. The proposed converter is well-suited for renewable energy systems and holds theoretical significance and practical value in renewable energy applications. It provides an effective solution to the issue of low output voltage in renewable energy power generation systems.

---

Keywords

---