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This study introduces a novel bidirectional converter for DC microgrids, enabling efficient power transfer between renewable energy sources (RES), energy storage systems (ESS), and the DC grid. The design ensures excellent voltage regulation and high power conversion efficiency.

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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.