The isolated direct ac–ac converter has the advantages of high power density and long life time, however, suffering from the high cost and relatively low efficiency. In this article, a three-level isolated direct resonant ac–ac converter is proposed; thus, the voltage stress of power switches reduces to half of the input voltage amplitude, and as a result, the voltage rating of the power switches is reduced. A hybrid modulation strategy for the proposed converter is proposed to realize the ac–ac conversion and reduce the switching power loss. Furthermore, in order to obtain a good control of the output voltage based on the proposed converter, the closed-loop control strategy of the output voltage combining a linear controller with the repetitive controller (RC) is proposed and the detailed parameters design rule is discussed. The proposed control strategy not only realizes the sinusoidal output voltage waveforms and good dynamic performance but also effectively eliminates the effect of input voltage harmonics. The corresponding proposed topology, modulation, and closed-loop control strategy are all verified by the detailed experimental results.
Three-Level Isolated Direct AC–AC Converter and its Closed-Loop Control Strategy
IEEE Transactions on Transportation Electrification ; 9 , 3 ; 3810-3820
2023-09-01
2052715 byte
Article (Journal)
Electronic Resource
English
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