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

Hui Wang, Tianshi Yu, Manlin Wang and Guangfu Ning ()
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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

Energies, 2024, vol. 17, issue 7, 1-13

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.

Keywords: matrix-type SST; solid-state transformer (SST); LLC resonant converter; zero voltage switching (ZVS) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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