三线圈结构能够有效提升无线电能传输(Wireless Power Transfer,WPT)系统传输距离.S/S/S拓扑因简单实用而广泛应用于三线圈WPT系统,但传统的完全补偿方法令各线圈自感与补偿电容形成串联谐振,受线圈耦合及负载条件影响,系统无法在不同工况下均达到最佳传输效率.针对这一问题,提出一种非完全补偿的S/S/S拓扑参数配置方法.首先,通过对传统补偿方法分析,阐明了完全补偿时系统效率不佳的原因.然后,以线圈传导损耗最小为目标,采用非线性规划方法对中继和接收线圈补偿参数进行优化,同时匹配发射线圈最佳补偿参数以减小功率器件开关损耗.最后,通过仿真分析得到采用非完全补偿方法时的系统特性,揭示系统效率提升的内在机理,并以输出功率为1 kW的三线圈WPT系统为例开展实验研究.结果表明:与完全补偿方法相比,采用所提非完全补偿方法的系统AC-AC效率提高5.183％、输入电压降低85.3％;与中继线圈切换方法相比,AC-AC效率提高4.214％;所提方法能够实现逆变器功率器件的软开关和系统最优效率,增强三线圈WPT系统的实用性.
Non-full compensation optimized efficiency method for three-coil WPT system with S/S/S topology
The three-coil structure has proven effective in enhancing the transmission distance of Wire-less Power Transfer (WPT) systems. The S/S/S topology is widely adopted in three-coil WPT sys-tems due to its simplicity and practicality. However,traditional full compensation methods lead to sub-optimal efficiency due to reverse coupling between coils and a single power transmission path. To ad-dress this issue,a non-full compensation method is proposed for parameter configuration in S/S/S to-pology. Firstly,based on the analysis of the traditional compensation method,the reason for the ineffi-ciency under full compensation is clarified. Subsequently,aiming to minimize coil conduction losses,compensation parameters of relay and receiving coils are optimized using nonlinear programming. The optimal compensation parameter for the transmitting coil is determined to reduce power device switch-ing losses. Finally,simulation analysis reveals the characteristics of the system under the proposed non-full compensation method,elucidating the intrinsic mechanisms behind efficiency improvement. Experimental validation is conducted on a three-coil WPT system with 1 kW output power. Experi-mental results indicate that compared to full compensation,the proposed method enhances AC-AC ef-ficiency by 5.813％ and reduces input voltage by 85.3％. Furthermore,compared to relay coil switch-ing,it improves AC-AC efficiency by 4.214％. The proposed method facilitates zero voltage switch-ing of power devices in the inverter,optimizing system efficiency and enhancing the practicality of three-coil WPT systems.
wireless power transfercompensation parameterefficiency optimizationzero voltage switchingrelay coil
万方数据
维普
