Modified design TWCI-based high step-up DC-DC converter with reduced elements and low input current ripple for...

Area of Science:

• Electrical Engineering
• Power Electronics
• Renewable Energy Systems

Background:

• Renewable energy sources require efficient DC-DC conversion for grid integration.
• Existing converters often face challenges with high voltage gain, component count, and voltage stress.

Purpose of the Study:

• To present a non-isolated high step-up DC-DC converter topology.
• To achieve ultra-high voltage gain without extreme duty cycles for renewable energy applications.

Main Methods:

• Utilizing a modified three-winding coupled inductor with a voltage multiplier cell.
• Conducting comprehensive analysis of operating principles, steady-state performance, and device stresses.
• Performing experimental validation with a 250 W prototype (24 V to 400 V).

Main Results:

• Achieved ultra-high voltage gain without extreme duty cycles.
• Minimized component count and reduced voltage stress across semiconductors and capacitors.
• Demonstrated a peak efficiency of 95.3% in experimental validation.

Conclusions:

• The proposed converter topology is effective for next-generation renewable energy systems.
• The design offers a cost-effective, efficient, and reliable solution for photovoltaic and fuel-cell integration.
• The coupled inductor cell provides simplicity and flexibility for integration into other converter designs.