考虑线圈参数变化的SS型动态无线电能传输系统参数优化设计方法

Parameter Design Method for SS Compensated Dynamic Wireless Power Transfer System Considering Coils’Parameters Variations

在自动导引车的动态无线电能传输(DWPT)系统中,由于载重变化导致的接收端高度变化是不可避免的。这会造成系统线圈参数(自感和互感)改变,进而影响系统增益平稳。为了在DWPT系统接收端发生垂直偏移时保证系统增益平稳,该文基于串联串联(SS)拓扑提出一种考虑线圈参数变化的补偿拓扑参数设计方法。通过建立考虑线圈参数变化的SS拓扑等效环路模型,分析系统增益与补偿参数的关系,确定补偿拓扑参数设计的约束条件与解空间范围。设计以输出电流增益平稳性与效率为目标的优化函数,基于粒子群优化算法提出一种SS拓扑补偿参数设计方法。所提方法在系统线圈参数变化的条件下,实现输出电流的稳定,且保有较高的效率。最后,搭建一套1kW的原理样机用于验证所提方法的有效性。实验结果表明:在设定的高度变化范围(20~80mm)内,耦合机构自感增加19.1μH、45.22μH,互感增加至2.4倍,系统输出电流最大波动率仅为3.55%,最高效率达96.52%。

For automatic guided vehicles with dynamic wireless power transfer(DWPT),the gap of the receiver is inevitable due to the variation of load.It can cause the system coils’parameters(self-inductances and mutual inductance)to change,further affecting the stability of the system output.In order to realize a stable output of the DWPT system when the gap of the receiver is variable,a parameter design method based on a series-series(SS)topology is proposed in this paper.An equivalent circuit model of the SS topology considering the change of coil parameters is established to analyze the influence of the compensation parameters on system output.Thus,the constraints and solution space of compensation topology parameters are determined.A parameter design method for SS topology is proposed based on particle swarm optimization algorithm to maintain stable output current and high efficiency.Finally,a 1kW prototype was built to verify the effectiveness of the proposed approach.Experimental results indicate that within the gap range(20mm~80mm),the maximum fluctuation of the designed system output current is only 3.55%when the self-inductances increase by 19.1μH and 45.22μH,respectively,and the mutual inductance increase to 2.4 times.Furthermore,the highest efficiency of the system reaches 96.52%.