An efficient high-gain bidirectional interleaved boost converter for PV integration to DC microgrid

Area of Science:

• Power Electronics
• Electrical Engineering
• Renewable Energy Systems

Background:

• DC microgrids require efficient interfaces for integrating diverse energy sources and storage.
• Managing bidirectional power flow and islanded operation is crucial for microgrid stability.

Purpose of the Study:

• To present a multi-port, non-isolated, interleaved, high-voltage gain bidirectional converter for DC microgrids.
• To develop a novel power transfer selection algorithm for managing power flow between RES, ESS, and the DC grid.

Main Methods:

• Utilized a voltage multiplier circuit for high-voltage gain and a resonant power module for step-down conversion.
• Developed and simulated a power transfer selection algorithm based on net power difference.
• Validated simulation results with a 200W hardware prototype using MATLAB/SIMULINK.

Main Results:

• Achieved excellent voltage regulation and efficient power conversion with high voltage gain.
• Demonstrated feasible duty cycle range and validated simulation with experimental results.
• The proposed converter supports multiple power transfer modes with high efficiency.

Conclusions:

• The presented bidirectional converter is a superior interface for DC microgrids, offering high efficiency and multi-mode support.
• The novel control algorithm effectively manages power flow among RES, ESS, and the DC grid.
• The topology is suitable for applications requiring integration of low-voltage sources with high-voltage DC buses.