스위칭-셀 전류형 백투백 컨버터

초록

Current source converters (CSCs) have certain advantages over voltage source converters, such as their use of an inductor for power decoupling and the absence of the shoot-through problem. However, the open-circuit problem is a serious issue in CSCs. Conventional CSCs require an adequate overlap time to prevent the open-circuit problem, but the overlap time can distort input and output waveforms. Thus, this study proposed a three-phase switching-cell back-to-back CSC (SC-CSC). Compared with conventional CSCs, the proposed SC-CSC can avoid the open-circuit issue and hence demonstrates enhanced reliability. In addition, owing to the switching-cell capacitors in the proposed SC-CSC, this study proposed a modified SVPWM to obtain the same voltage rating for the semiconductor device as that of conventional converters. Furthermore, this study analyzed the operating principle and characteristics of the proposed SC-CSC in detail.

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