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Optimal Variable Frequency Soft Switching for Interleaved Grid Tied Inverters in Electric Vehicle Charging Applications

Author

Listed:
  • Youssef A. Fahmy

    (Department of Electrical Engineering, Columbia University in the City of New York, New York, NY 10027, USA)

  • Matthew Jahnes

    (Department of Electrical Engineering, Columbia University in the City of New York, New York, NY 10027, USA)

  • Matthias Preindl

    (Department of Electrical Engineering, Columbia University in the City of New York, New York, NY 10027, USA)

Abstract

Synchronized variable frequency soft-switching is analyzed and implemented in a 3-phase bidirectional grid-tied inverter. The common-mode connected topology and control allow for independent analysis of a single phase leg before six are combined into two interleaved, 3-phase inverters. Effective operation is enabled by discretizing the variable switching frequencies before synchronizing them with a control signal. The resulting inverter can operate at any power factor at power levels up to 50 kVA while maintaining zero-voltage switching (ZVS) throughout the grid cycle. Formal conditions for soft-switching and methods for achieving ZVS while maintaining global synchronization are presented. These conditions are then verified in a simulation. Finally, results for different power factors with and without interleaving are demonstrated in a prototype that achieves >98.1% efficiency when converting all real power.

Suggested Citation

  • Youssef A. Fahmy & Matthew Jahnes & Matthias Preindl, 2024. "Optimal Variable Frequency Soft Switching for Interleaved Grid Tied Inverters in Electric Vehicle Charging Applications," Energies, MDPI, vol. 17(23), pages 1-16, December.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:23:p:6077-:d:1535490
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