Abstract Multiport wireless DC-DC converter (MWiDC) has the potential to realize efficient multiport power conversion with high-level flexibility and expansibility. However, its system modeling and power flow management need more general theory. Therefore, this paper proposes a modular MWiDC. Firstly, a model of an arbitrary MWiDC is established, and a power-voltage hybrid decoupling control (PVHDC) strategy is designed. The closed-loop DC gain, high-frequency characteristic, and stability under the PVHDC strategy are demonstrated. This paper also analyzes the direct control strategy (DCS) without decoupling for comparison. However, the closed-loop stability of the DCS still needs to be proved due to the system’s complexity. Finally, the experiment and simulations are carried out on a three-port prototype. The experimental results show that the prototype can realize zero voltage switching with an efficiency of 91%. The simulation indicates that both PVHDC and DCS can realize voltage-power hybrid control, but PVHDC has a stronger anti-disturbance.
Song Zhao,Liu Ming. Modular Multiport Wireless DC-DC Converter with Multidirectional Power Flow and Its Decoupling Control Strategy[J]. Transactions of China Electrotechnical Society, 2022, 37(24): 6262-6271.
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