基于新型高频纹波电流补偿方法的内置式永磁同步电机无传感器控制  

Research on Sensorless Control Strategy of IPMSM Based on New High Frequency Ripple Current Compensation Method

作　　者：徐奇伟 熊德鑫 陈杨明 王益明 张雪锋 Xu Qiwei;Xiong Dexin;Chen Yangming;Wang Yiming;Zhang Xuefeng(State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing University,Chongqing 400044 China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044

出　　处：《电工技术学报》2023年第3期680-691,共12页Transactions of China Electrotechnical Society

基　　金：国防科技工业核动力技术创新中心资助项目(HDLCXZX-2021-ZH-016)。

摘　　要：高频方波信号注入法已广泛运用于内置式永磁同步电机(IPMSM)无位置传感器低速控制中,该方法可以避免使用滤波器且明显提高系统带宽。然而,在轻载或空载等基波较小时,当逆变器的死区效应使高频电流响应出现畸变,此时逆变器的非线性将会严重影响高频注入法的位置估算精度。针对上述问题,该文重点分析逆变器非线性对IPMSM高频方波注入法的影响,提出一种新型高频纹波电流提取和补偿方法,有效降低死区的影响,提高注入电压的效率,抑制逆变器非线性引起的位置角度误差。通过仿真和实验结果证明,与传统方法相比,该方法可以在注入相同电压幅值的情况下有效降低位置估算误差,验证了所提出方法的可行性和有效性。High frequency square wave injection method can avoid the use of filters and improve the system bandwidth. However, when the fundamental wave is small such as light load or no load situation, when the dead time effect of the inverter distorts the high frequency current, the dead time in the inverter nonlinearity will affect the position estimation accuracy of the high frequency injection method. To address these issues, this paper analyzes the influence of inverter nonlinearity on high frequency square wave injection method, and then proposes a new method of high frequency ripple current extraction and compensation. This method can separate and compensate three-phase current from the natural coordinate system, can effectively reduce the influence of dead time, improve the efficiency of injection voltage, and suppress the position angle error caused by inverter nonlinearity.When the fundamental current of the motor is large, the high-frequency current response is carried above the fundamental current, the dead time has little influence on the high frequency current, and the current distortion is not obvious;When the motor operates at low speed conditions such as light load or no load, the inverter nonlinearity will cause serious distortion to the three-phase high frequency current response, which will affect the accuracy of position observation, because the high frequency current is the dominant component compared with the fundamental current. The existence of dead time, the three-phase current will be distorted, the high frequency current extracted in synchronous rotating coordinate system will produce errors. Therefore, this paper proposes a strategy of extracting fundamental current and modifying high frequency current in natural coordinate system to reduce the position observation error caused by dead time under low speed and no load conditions. Firstly,according to the symmetry of the current waveform in the positive and negative injection phase, the fundamental current can be considered as the sampling avera

关 键 词：永磁同步电机 无传感器控制 高频方波注入 逆变器非线性 纹波电流补偿 

分 类 号：TM351[电气工程—电机]