ABSTRACT With the increasing requirements of higher‐voltage withstanding ability, higher modulation flexibility, lower cost for prototype establishment, wider zero‐voltage‐switching (ZVS) range adjustment ability and bidirectional power transmission ability, a three‐level active neutral‐point‐clamped dual active bridge (ANPC‐DAB) converter is proposed to achieved the aforementioned goals. To achieve efficient power transmission inside the ANPC‐DAB converter, a double‐side variable duty modulation (DVDM) strategy is also proposed. On the one hand, switching states and soft‐switching conditions of the ANPC half‐bridge circuit are discussed in detail. How to realize ZVS turn‐on of clamping switches and non‐clamping switches is also discussed. Meanwhile, typical mode illustrations, power characteristics, and current characteristics under different DVDM operation modes are demonstrated comprehensively. On the other hand, to achieve efficient power transfer inside the ANPC‐DAB converter, based on a genetic algorithm, under a certain transmission power, peak current can be achieved at the lowest. Meanwhile, based on a complete differential algorithm, a wide operating‐range comprehensive optimization strategy is developed to reduce RMS current and extend the ZVS region simultaneously. Through the comprehensive comparisons among existing modulation methods inside the ANPC‐DAB converter, the proposed DVDM strategy can achieve better efficiency performance. In the end, an ANPC‐DAB prototype is established, and the effectiveness and correctness of the proposed method can be proved.
Tian et al. (Thu,) studied this question.
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