Yuechao Li, Zhenhai Zhang, and Yao Ju
Electric vehicle, bidirectional power converter, single-phase full-bridge AC/DC, three-port isolated DC/DC, control algorithm
To tackle issues like high costs, independent design, and poor user experience in electric vehicle (EV) charging and discharging technology, this paper proposes an optimisation method based on bidirectional power converters. This method involves analysing mathematical models of converters in various modes, deriving their power circuit transfer functions, and laying the groundwork for circuit theory analysis, control algorithms, and parameter design. Results indicate that in the bidirectional AC/DC circuit, output voltage stabilises at 350 V within 0.1 s. In constant current mode, it maintains a 20 A output while gradually increasing the voltage. In constant voltage mode, battery capacity exceeds 95% in 0.32 s, followed by a gradual decrease in current and voltage stabilisation at 310 V. This study not only proves the circuit’s feasibility but also highlights its potential for extensive use in EV charging and smart grid applications.
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