IPMSM驱动系统的实时效率优化控制方法研究

摘要

A real-time efficiency optimization control method for IPMSM drive systems was proposed,which real-time calculated the optimization d/q axis current lead to minimize motor loss under guaranteeing expected output torque.Each loss of the IPMSM with operating was analyzed,and its total losses was modeled.Associating with various constraint conditions (torque constraint,current constraint and voltage constraint),the efficiency optimization of the motor was modeled as the optimization problem based on constraints.The equations what the optimization currents meet was derived through employing the Karush-Kuhn-Tucker conditions.A simplified Newton method that solves the optimization currents by iteration way was presented.By comparing and analyzing several methods that solve the optimization currents,the method proposed can obtain approximate solution of real optimization current which is very close to the precise solution only by once iteration.By simulating the IPMSM drive system based on the efficiency optimization control method,experimental results show that the efficiency optimization control method is feasible and effective.%提出一种应用于内嵌式永磁同步电动机(IPMSM)驱动系统的实时效率优化控制方法,该方法在保证系统期望输出转矩的情况下能实时快速地计算使电机损耗最小的d/q轴电流(后称为优化电流).为了达到该目的,首先分析IPMSM运行时的各种损耗,进而建立它的总损耗模型,并将电机的效率优化建模为具有约束条件(转矩约束、电流约束和电压约束)的优化问题；接着用优化理论中的Karush-Kuhn-Tucker条件导出优化电流所满足的方程；最后简化Newton方法并给出其优化电流的迭代求解公式.通过对几种优化电流求解方法进行对比分析,所提出的方法只需迭代求解一次即可使求得的优化电流近似解非常接近于其精确解.仿真基于效率优化控制的IPMSM驱动系统,实验结果显示该效率优化控制方法的可行性和有效性.