Research on strong anti-misalignmemt methods of double-coupled LCL topology ICPT system
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摘要: 感应耦合式电能传输(ICPT)系统在线圈偏移时会造成输出功率和输出电压波动,现有的抗偏移方法存在过于依赖系统建模且自适应性较差的问题,且大多没有考虑耦合系数连续变化对系统输出特性的影响。针对上述问题,以基于DDQ线圈的双耦合LCL拓扑ICPT系统为研究对象,提出了一种基于变论域的模糊自适应控制的强抗偏移方法。首先通过电路分析推导出双耦合LCL拓扑ICPT系统的输出功率表达式,得到输出功率与耦合系数及系统参数之间的关系;然后借助有限元分析软件ANSYS对DDQ线圈进行三维磁场建模,得到了耦合系数与线圈偏移量之间的对应关系,在此基础上,以得到的3组偏移量与耦合系数的对应值为数据,并以系统输出功率波动的偏差平方和为目标函数,提出了基于自适应粒子群的ICPT系统参数优化方法,得到输出功率波动最小的一组系统最优参数值,一定程度上提升了系统的抗偏移性能;最后采用基于变论域的模糊自适应控制方法,通过动态调节PID控制系数的修正值实现快速调节负载端电压的目的,以使系统输出较高的功率。仿真结果表明:该方法解决了现有方法存在的自适应性较差的问题,能很好地适应耦合系数连续变化的工况,具有较好的适应性和控制效果,提升了ICPT系统的强抗偏移性能,维持了负载端输出电压的基本恒定。Abstract: Inductively coupled power transmission (ICPT) systems cause fluctuations in output power and output voltage when the coil is offset.The existing anti-misalignmemt methods have the problems of relying too much on the system modeling and poor adaptivity. Most of the methods do not consider the impact on the system output characteristics when the coupling coefficient changes continuously. To address the above problems, taking the dual-coupled LCL topology ICPT system based on DDQ coils as the research object, the paper proposes a strong anti-misalignmemt method based on fuzzy adaptive control in variable universe. Firstly, the output power expression of the dual-coupled LCL topology ICPT system is derived from the circuit analysis, and the relationship between the output power, the coupling coefficient and system parameters is obtained. Secondly, by applying the finite element analysis software ANSYS, a three-dimensional magnetic field modeling of the DDQ coil is carried out to obtain the correspondence between the coupling coefficient and the coil offset. On the basis, the corresponding values of the three sets of offsets and the coupling coefficients are used as the data, and the square sum of deviations of the system output power fluctuations is taken as the objective function. Hence, the parameter optimization method of ICPT system based on adaptive particle swarm is proposed to obtain a set of optimal parameter values of the system under the minimum output power fluctuation and improve the anti-misalignmemt performance of the system to a certain extent. Finally, a fuzzy adaptive control method based on variable universe is used to achieve the purpose of quickly adjusting the load terminal voltage by dynamically adjusting the correction value of the PID control coefficient to make the system output higher power. The simulation results show that the method solves the problem of poor adaptivity of existing methods, adapts well to the working conditions with continuous changes of coupling coefficients, has better adaptability and control effect, improves the strong anti-misalignmemt performance of ICPT system, and maintains the basic constant output voltage at the load side.
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