电动汽车无线电能传输系统参数优化研究

Research on Parameter Optimization of Electric Vehicle Wireless Power Transmission System

双边LCC(DS-LCC)拓扑因其具有不依赖负载的恒流输出特性被广泛应用于电动汽车无线电能传输(WPT)系统,但传统对称参数设计方法并未充分利用其设计自由度高等优势,使系统效率难以进一步提升。针对该问题,在不改变系统主要参数前提下,提出了一种非对称参数设计方法以提升系统效率,即通过改变两个补偿电感配比来重新设计补偿参数,并在此基础上进一步优化补偿电容实现了逆变器软开关,确立了最佳效率点的参数配比。最终通过搭建3 kW实验样机验证了系统可行性,实验结果表明优化后的效率最高达到92.7%,且在全功率范围内,比优化前的系统效率提高了1.3%~1.4%。

Double-side LCC(DS-LCC)topology is widely used in electric vehicle wireless power transmission(WPT)system because of its constant current output characteristics independent of load.However,the traditional symmetric parameter design method does not take full advantage of its high design freedom,making it difficult to further improve the system efficiency.Aiming at this problem,an asymmetric parameter design method is proposed to improve the system efficiency without changing the main parameters of the system,that is,the compensation parameters are redesigned by changing the ratio of two compensation inductors,and on this basis,the compensation capacitors are further optimized to achieve soft switching of the inverter,and the parameter ratio of the optimal efficiency point is established.Finally,the system feasibility is verified by building a 3 kW experimental prototype,and the experimental results show that the optimized efficiency reaches up to 92.7%and improves 1.3%~1.4%over the pre-optimized system efficiency in the full power range.