Abstract A novel impedance source modular bidirectional power converter is proposed to solve the problems of traditional modular multilevel converter applied in energy storage system. The converter combines bi-directional quasi-Z-source with half-bridge sub-module to form impedance source sub-module. The introduction of bi-directional quasi-Z-source changes the energy conversion mode of modular multilevel converter, which enables the system to store energy in buck mode and release energy in boost mode, thus solving the over-current problem of traditional converter when the bus voltage increases instantaneously. Besides, the bi-directional quasi-Z-source can increase the input voltage of the half bridge converter, thus reducing the number of series modules, which is helpful to simplify the system control structure and improve the system reliability. In this paper, the working principle and modulation method of the sub-module of the converter are analyzed in detail, and the control strategy of the system is designed. Based on the theoretical analysis and experimental results, the proposed converter is more suitable for energy storage system than the traditional modular multilevel DC-DC converter.
Liu Yue,Bi Kaitao,Zhu Yixin等. Design and Control of Quasi-Z-Source Modular Multilevel Bidirectional DC-DC Converter for Energy Storage System[J]. Transactions of China Electrotechnical Society, 2022, 37(zk1): 235-245.
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2022, Vol. 37 
