五相永磁同步电机改进型无差拍直接转矩和磁链控制  

An Improved Deadbeat Direct Torque and Flux Control Strategy of Five-Phase Permanent Magnet Synchronous Motor

作　　者：刘国海[1] 孙汶超 周华伟[1] 刘正蒙 Liu Guohai;Sun Wenchao;Zhou Huawei;Liu Zhengmeng(School of Electrical and Information Engineering Jiangsu University,Zhenjiang 212013 China)

机构地区：[1]江苏大学电气信息工程学院,镇江212013

出　　处：《电工技术学报》2023年第24期6658-6667,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(52277052);江苏高校“青蓝工程”资助项目。

摘　　要：传统无差拍直接转矩磁链控制(DB-DTFC)策略应用于五相永磁同步电机(PMSM)时存在稳态性能差、转矩和磁链耦合、谐波电流大等问题,该文提出一种改进型DB-DTFC策略。首先,为实现转矩和磁链的解耦控制,在两相静止坐标系中对定子电压与转矩和磁链之间的关系进行分析,求解满足控制要求的电压矢量。其次,设计电流和磁链观测器补偿数字控制系统的延时。再次,采用基于4个非零电压矢量的空间矢量脉宽调制(SVPWM)技术,抑制相电流的3次谐波分量。实验结果表明,该策略计算简便,抑制了转矩和磁链脉动,降低了3次谐波电流,提升了控制系统动稳态性能。With the advantages of higher bus voltage utilization and more degrees of control freedom,multiphase permanent magnet synchronous motors(PMSMs)are widely used in electric vehicles,ship propulsion,and other fields.Direct torque control(DTC)and vector control(VC)are the most popular methods.Compared with VC,DTC needs two hysteresis comparators of stator flux linkage and torque and a switching table,which has a simple structure and fast dynamic response.However,traditional DTC has the disadvantages of large torque,flux linkage ripples,and high current harmonics.Model predictive torque control(MPTC)selects the optimal voltage vector from a control set according to the cost function to improve the torque and flux dynamic response.It has heavy computational burden and difficulty in tuning the weighting factor.Deadbeat direct torque and flux control(DB-DTFC)can eliminate the errors of torque and flux linkage within one sampling period by a voltage vector,which is obtained by discretizing the mathematical model.In addition,its control structure is simple,and it is unnecessary to adjust redundant parameters.However,there is a coupled relationship between torque and stator flux linkage.The traditional DB-DTFC has poor dynamic and steady-state performance.Therefore,an improved DB-DTFC strategy is proposed for five-phase PMSM.Firstly,the PMSM model is discretized in the two-stationary frame,and a voltage vector is obtained from the relationship among stator voltage,torque,and stator flux linkage.Thus,the decoupling control of torque and stator flux linkage can be achieved.Secondly,current and flux linkage observers are built to compensate for delay and parameter disturbance in the digital control system.Finally,due to harmonic space in the five-phase PMSM,the space vector pulse width modulation(SVPWM)based on four non-zero vectors is designed to restrain the third harmonic current.Experimental results of the traditional and improved DB-DTFC were tested at rated speed to evaluate the steady-state performance.Compared with the

关 键 词：无差拍控制 直接转矩和磁链控制 永磁同步电机(PMSM) 延时补偿 空间矢量脉宽调制(SVPWM) 

分 类 号：TM351[电气工程—电机]