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Dynamic Enhancement for Dual Active Bridge Converter with a Deadbeat Current Controller.

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This study enhances deadbeat current controllers for isolated bidirectional dual-active-bridge DC-DC converters (IBDC) using an advanced modulation technique. The improved controller significantly reduces settling time during load changes, ensuring stable power conversion.

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Control Systems

Background:

  • Isolated bidirectional dual-active-bridge DC-DC converters (IBDC) are crucial for efficient power transfer.
  • Existing deadbeat current controllers face challenges with dynamic response and transient DC current bias.

Purpose of the Study:

  • To investigate and improve deadbeat current controllers for IBDC applications.
  • To enhance the dynamic performance and stability of IBDC systems.

Main Methods:

  • Utilized an enhanced single phase shift (ESPS) modulation with pulse width control.
  • Developed and compared peak current mode (PCM) and middle current mode (MCM) controllers.
  • Implemented a double-closed-loop control with load feedforward.

Main Results:

  • Achieved direct control of high-frequency inductor current, eliminating transformer DC bias.
  • Reduced settling time to 6 PWM cycles during load changes in a 5 kW IBDC prototype.
  • Demonstrated superior dynamic performance and voltage regulation.

Conclusions:

  • The proposed control method significantly enhances IBDC dynamic response.
  • ESPS modulation with double-closed-loop control and load feedforward offers robust performance.
  • Validated effectiveness through experimental results in a 5 kW prototype.