适用于柔性互联的电流源型双有源桥高频环节频域建模及设计OACSTPCD

The flexible DC interconnection of medium and low voltage can improve the flexibility and reliability of the distribution network,and the dual active bridge converter is a key link in achieving voltage conversion and electrical isolation in flexible interconnection equipment.The current source resonant dual active bridge utilizes DC capacitors to participate in resonance and soft switching design,which can significantly improve the power density and efficiency of the dual active bridge.However,there are significant differences in the characteristics between the current source resonant dual active bridge and the traditional voltage source resonant dual active bridge.The resonant cavity is composed of a DC resonant capacitor and an AC side resonant inductor,which leads to complex time-domain modeling of high-frequency current and affects the frequency design of zero current switching(ZCS),making it difficult to obtain analytical expressions for the ZCS switching frequency and resonant frequency.An equivalent circuit modeling method for high-frequency isolation links based on fundamental components from a frequency domain perspective was proposed,established an analytical relationship between ZCS switch frequency and resonant frequency,and verified the effectiveness and accuracy of the proposed method through simulation and experimental results.