动态IPT系统并联输出特性分析与均流参数设计方法

Analysis of Parallel Output Characteristics of Dynamic IPT System and Design Method of Current Sharing Parameters

采用多拾取模块并联输出的动态感应电能传输(Inductive power transfer,IPT)系统提高了系统的功率传输能力,适用于长轨式的发射结构,在大功率场合有着广泛的应用前景。但由于拾取模块间参数的微小差异以及模块的动态运行,实际的应用过程中会出现拾取模块电流分配不平衡的现象,甚至会导致拾取模块过流损坏。从LCC-S的数学模型出发,推导了拾取模块的输出伏安特性与负载分配特性,分析了不同补偿状态下拾取参数对电流分配的影响,并据此提出一种副边失谐补偿的方案。给出了失谐系数的参数设计方法,利用了对副边参数的调节,实现各个模块的近似均流控制。最后,搭建了一台三个拾取模块并联输出的试验样机,应用所提的失谐补偿方法后,模块间最大电流比例由13.02降低到1.3。试验结果与理论分析一致,证明了所提方案的正确性与有效性。

The dynamic induction power transfer(IPT)system,with multiple pickup modules parallel output,improves the power transmission capability of the system and is suitable for long rail transmission structures.It has broad application prospects in high-power applications.However,due to the sight differences in parameters between the pickup modules and the dynamic operation of the modules,there may be imbalanced current distribution of the pickup modules in the actual application,which even causes overcurrent damage to the pickup modules.Starting from the mathematical model of LCC-S,the output volt-ampere characteristics and load distribution characteristics of the pickup module are derived,the influence of pickup parameters on current distribution under different compensation states is analyzed,and a secondary side detuning compensation scheme is proposed.A parameter design method for the detuning coefficient is provided,utilizing the adjustment of the secondary side parameters to achieve approximate current sharing control for each module.Finally,an experimental prototype with three pickup modules output in parallel is built.After applying the proposed detuning compensation method,the maximum current ratio between modules is reduced from 13.02 to 1.3.The test results are consistent with theoretical analysis,proving the correctness and effectiveness of the scheme.