A Novel Non-Isolated High-Gain Non-Inverting Interleaved DC-DC Converter

Area of Science:

• Electrical Engineering
• Power Electronics
• Renewable Energy Systems

Background:

• Renewable energy sources (RES) like photovoltaic (PV) and fuel cells (FC) often have low output voltages.
• High-gain DC-DC converters are crucial for integrating RES into power grids and ensuring satisfactory performance.
• Existing solutions may face challenges with isolation, efficiency, or component stress.

Purpose of the Study:

• To propose a novel non-isolated, non-inverting, interleaved DC-DC boost converter topology.
• To achieve high voltage gain suitable for RES integration.
• To reduce voltage stress on switching components and maintain high efficiency.

Main Methods:

• A new converter topology utilizing two inductors in series and parallel configurations.
• Implementation of a voltage multiplier technique for high voltage gain.
• Operation in three distinct modes with two duty ratios to manage gain and component stress.
• Steady-state analysis and prototype development (160 W, 20/400 V) for validation.

Main Results:

• The proposed converter achieves a very high voltage gain of 20.
• A peak efficiency of 93.2% was attained by the hardware prototype.
• Significantly reduced voltage stress on switches, with maximum stress at 50% of the output voltage.

Conclusions:

• The developed non-isolated interleaved DC-DC boost converter effectively addresses the need for high voltage gain in RES.
• The intelligent design, employing two duty ratios, successfully mitigates extreme duty ratios and lowers switch voltage stress.
• The prototype validation confirms the topology's capability to deliver high voltage gain and high efficiency, making it suitable for renewable energy applications.