实现纹波电流还原的PMSM端口模拟算法

Port Algorithm with Ripple Current Reduction for PMSM-EME

电机模拟器作为一种模拟电机端口特性的三相电力电子装置,为电驱动系统的测试提供了高效的测试手段。电机模拟器还原目标电机端口特性的标志是精确还原目标电机的工作电流,现有研究实现了基波电流及较低阶次谐波电流的还原,但针对电机在电机控制器驱动下的高频纹波电流的还原仍严重依赖滤波电感与目标电机电感的匹配,降低了电机模拟器的通用性。为此,本文基于电路等效虚拟法将永磁同步电机等效电路拆分为两部分,一部分由电机模拟器实际电路代替,另一部分由控制算法模拟,并结合无差拍电流预测控制对控制差拍进行了补偿,提出了前馈解耦无差拍电流跟随策略。实验结果表明,基于新提出的永磁同步电机端口模拟算法,电机模拟器可以在不更换电感的情况下模拟不同参数的永磁同步电机,高频纹波电流的频域跟踪误差从传统策略的160%降低至20%,显著提高了电机模拟器对永磁同步电机端口特性的模拟精度。

As a three-phase power electronic device that emulates the characteristics of motor ports,the electric machine emulator(EME)provides an efficient test method for the testing of electric drive systems.The main sign of EME's restoration of the target motor port characteristics is to accurately restore the working current of the target motor,though the existing research has realized the reduction of the fundamental current and the lower order harmonic current,the restoration of the high-frequency ripple current of the motor driven by the motor controller still relies heavily on the matching of the filter inductor and the inductance of the target motor,which reduces the versatility of the EME.Therefore,based on the circuit equivalence virtual method,the equivalent circuit of PMSM is divided into two parts,with one part replaced by the actual circuit of EME,and the other part emulated by the control algorithm.Then,combining with the predictive control of the non-differential beat current,the control differential beat is compensated and the feedforward decoupling non-differential beat current following strategy is proposed.The experimental results show that based on the newly proposed port simulation algorithm of the permanent magnet synchronous motor,the EME can emulate PMSM with different parameters without replacing the inductor,with the frequency domain tracking error of high-frequency ripple current reduced from 160%to 20%of the traditional strategy,which significantly improves the emulation accuracy of the EME for the port-characteristics of PMSM.