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Hybrid phase shift modulation scheme for dual active bridge bidirection-al DC / DC converter
投稿时间:2021-02-25  修订日期:2021-03-31
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DOI:
Keywords:dual active bridge converter, soft switching characteristics, inductor root-mean-square current , phase shift modulation scheme
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AuthorInstitutionEmail
LI Yu Guizhou Wanfeng Electric Power Co., Ltd 410034386@126.com
ZHANG Xinrui State Grid Hubei DC Transportation Inspection Company xinrui_zhang0104@163.com
SHUI Chaohui Guizhou Wanfeng Electric Power Co., Ltd 472294035@qq.com
HUANG Jianqi Guizhou Wanfeng Electric Power Co., Ltd 158790457@qq.com
LONG Peng Guizhou Wanfeng Electric Power Co., Ltd 395168935@qq.com
ZHANG Jinhua Guizhou Wanfeng Electric Power Co., Ltd 327850144@qq.com
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Abstract:
      This paper addresses the modulation scheme of the bidirectional dual active bridge (DAB) bidirectional DC/DC converter. The main advantage of the DAB converter is that it has the characteristics of symmetrical structure, bidirectional power flow capability, wide soft switching area and flexible control capability and so on. The simplest way to control this topology is to control the direction and magnitude of power transmission by adjusting the phase shift angle between the primary and secondary bridges. However, when the input or output voltage of the converter varies widely, a large amount of reactive power is generated and zero voltage switching (ZVS) operation cannot be maintained at light load conditions, which directly leads to low conversion efficiency. Therefore, in order to improve the efficiency of the DAB converter, this paper proposes a hybrid phase shift modulation scheme which can reduce the inductor root-mean-square (RMS) current and extend the soft switching range on the basis of keeping the control simple, thereby improving the performance of the converter. Firstly, by making the controllable variables of extended phase shift (EPS), dual phase shift (DPS) and tripe phase shift (TPS) equal, four different phase shift modulation (PSM) schemes are obtained. Then, the steady-state characteristics of these modulation schemes are compared and analyzed, including transmission power capacity, inductor current level and soft switching performance. On this basis, a hybrid phase shift modulation scheme is proposed. Finally, an experimental platform is built to verify the effectiveness and correctness of the proposed modulation scheme.
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