低开关频率下基于MRAS的PMSM转子位置估计  

Rotor Position Estimation for PMSM Based on MRAS Under Low Switching Frequency

作　　者：黄敏 王勇[1] HUANG Min;WANG Yong(Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学,电气工程系,上海200240

出　　处：《电力电子技术》2021年第7期75-79,共5页Power Electronics

摘　　要：基于模型参考自适应系统(MRAS)的永磁同步电机(PMSM)无位置传感器控制系统,其转子位置估计精度与模型输入电压的准确性密切相关。针对低开关频率下,传统方法获取的模型输入电压与逆变器实际输出电压偏差较大的问题,提出一种模型输入电压重构方法。该方法在每个开关周期开始时,根据各相的开关状态及脉宽调制(PWM)波形的占空比,直接计算出每个采样周期内高电平的作用时间,并利用平均值等效原理重构定子的三相电压值作为MRAS的模型输入电压。仿真和实验结果表明,该方法能显著减小低开关频率下MRAS的比例积分(PI)调节器的计算误差,提高转子位置估计精度。The precision of rotor position estimation for the permanent magnet synchronous motor(PMSM)sensorless control system based on model reference adaptive system(MRAS)is closely related to the accuracy of the model input voltage.Under low switching frequency,the deviation between the model input voltage obtained by traditional methods and the actual output voltage of the inverter will be greatly increased.To solve this problem,a method of reconstruction of the model input voltage is proposed.The method is to calculate the duration of high level switching state in each sampling period at every beginning of switching period and reconstruct the stator phase voltage based on the principle of average value equivalence,according to the switching state and the duty cycle of pulse width modulation(PWM)waveform of each phase.And the reconstructed three-phase voltage of the stator is used as the model input voltage of MRAS.Simulation and experimental results indicate that the proposed method can significantly decrease the calculation error of the proportional integral(PI)regulator of MRAS and improve the precision of the rotor position estimation under low switching frequency.

关 键 词：永磁同步电机 无位置传感器 模型参考自适应系统 

分 类 号：TM351[电气工程—电机]