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Innovative Matrix-Type AC-AC Solid-State Transformer Eliminating Ripple Power with Double-Grid Frequency

Author

Listed:
  • Hui Wang

    (School of Automation, Central South University, Changsha 410083, China)

  • Tianshi Yu

    (School of Automation, Central South University, Changsha 410083, China)

  • Manlin Wang

    (School of Automation, Central South University, Changsha 410083, China)

  • Guangfu Ning

    (School of Automation, Central South University, Changsha 410083, China)

Abstract

Single-phase solid-state transformers (SSTs) have the advantages of a compact structure, higher reliability, and multiple functions, and have been widely studied. However, bulky energy storage elements and inherent ripple power with double-grid frequency issues are the main disadvantages of conventional single-phase SSTs. This paper presents a single-phase matrix-type AC-AC SST eliminating ripple power with double-grid frequency. The presented SST consists of a line-frequency-commutated rectifier without bulky DC-link capacitors, an LLC resonant converter, a buck converter, and a line-frequency-commutated inverter. The LLC operates efficiently with a fixed voltage gain, and the buck converter provides a voltage regulation function. As a result, high conversion efficiency, high power density, and potentially high reliability are achieved. A 1 kW SST prototype is developed and tested to validate the feasibility and functionality of the proposed methods.

Suggested Citation

  • Hui Wang & Tianshi Yu & Manlin Wang & Guangfu Ning, 2024. "Innovative Matrix-Type AC-AC Solid-State Transformer Eliminating Ripple Power with Double-Grid Frequency," Energies, MDPI, vol. 17(7), pages 1-13, March.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:7:p:1540-:d:1362460
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