Modified hybrid DC-DC boost converter with high voltage gain for renewable energy integration using GWO-DE parameter...

Area of Science:

• Electrical Engineering
• Power Electronics
• Renewable Energy Systems

Background:

• Integrating renewable sources like photovoltaic and micro-hydro power into high-voltage direct current (HVDC) systems requires efficient DC-DC converters.
• Conventional boost converters often lack the necessary voltage gain and can experience high voltage stress on components.

Purpose of the Study:

• To propose and analyze a modified hybrid DC-DC boost converter topology with enhanced voltage gain capability.
• To optimize the converter parameters for improved efficiency and reduced design time.

Main Methods:

• Steady-state analysis under continuous conduction mode (CCM) to derive voltage gain, current ripple, and efficiency expressions.
• Development of a hybrid grey wolf optimizer-differential evolution (GWO-DE) algorithm for parameter optimization.
• Training a gradient-boosting regression surrogate model for rapid design-space exploration.

Main Results:

• The proposed topology achieves a voltage gain of 12.5 at a duty cycle of 0.65.
• A peak efficiency of 96.8% was recorded.
• GWO-DE optimization resulted in a 2.7 percentage-point efficiency advantage over analytical design and a 22-fold reduction in design time compared to grid search.

Conclusions:

• The modified hybrid DC-DC boost converter topology effectively enhances voltage gain and reduces voltage stress for renewable energy applications.
• The GWO-DE optimization algorithm provides a superior and efficient method for designing high-performance power converters.
• Simulation results validate the theoretical analysis and demonstrate the proposed converter's superior performance compared to existing configurations.