基于抗偏移特性的电动汽车双拓扑补偿网络研究

Research on Dual Topology Compensation Network for Electric Vehicles Based on Anti-Islanding Characteristics

针对无线电能传输系统中耦合机构易偏移导致系统输出电流变化的问题,研究具有抗偏移特性的电动汽车双拓扑无线电能传输系统。首先,通过对双边LCC补偿网络拓扑的分析,探讨了谐振频率、输出功率、传输效率等之间的关系,并讨论了系统在错位工况下的建模分析及相应解决方案。结果显示,S-S拓扑在错位情况下功率变化较大,而LCC-S和LCC-LCC在水平错位范围内,功率变化系数(PVF)值较稳定。S-S拓扑在零错位时传输效率最高,但随着错位增大效率会急剧下降;LCC-S和LCC-LCC在小错位情况下效率较高,但在失谐状态下传输效率受影响较大。综合来看,虽然LCC-LCC拓扑的传输效率较低,但在错位情况下波动较小,适合动态无线充电场景。

This article studies a dual-topology wireless power transfer system for electric vehicles with anti-offset characteristics to address the issue of output current variation caused by coupling misalignment in wireless power transfer systems.Firstly,a comparison of transmission characteristics under typical compensation topology misalignment conditions was conducted for the S-S,LCC-S,and LCC-LCC topologies,analyzing the changes in power and efficiency.The results show that the S-S topology has significant power changes under misalignment conditions,while the LCC-S and LCC-LCC exhibit relatively stable Power Variation Factor(PVF)values within a certain misalignment range.The S-S topology achieves the highest transmission efficiency at zero misalignment,but efficiency sharply decreases as misalignment increases.The LCC-S and LCC-LCC exhibit high efficiency under small misalignment conditions,but their transmission efficiency is significantly affected in the case of detuning.Overall,although the transmission efficiency of the LCC-LCC topology is lower,it exhibits less fluctuation under misalignment conditions,making it suitable for dynamic wireless charging scenarios.