基于改进零脉冲插入法的永磁同步电机相电流重构策略  

Phase current reconstruction strategy of PMSM based on improvedzero pulse insertion method

作　　者：陈思宇 向学位 李辉[1] 周豪 蒋鹏 CHEN Siyu;XIANG Xuewei;LI Hui;ZHOU Hao;JIANG Peng(State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China)

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

出　　处：《电机与控制学报》2024年第6期25-35,共11页Electric Machines and Control

基　　金：国家自然科学基金(52207037);电磁能技术全国重点实验室资助课题(61422172220203)。

摘　　要：直流母线单电流采样永磁同步电机系统存在相电流重构盲区,导致电流采样失真,提出一种改进零脉冲插入法,实现相电流重构。首先,分析传统固定零脉冲插入法的缺点,由于各相插入零脉冲作用时间相同,未能发挥“双开关PWM”模式抑制电流纹波的优势;其次,通过各相PWM占空比调整零脉冲时间,延长电流采样窗口,提出改进零脉冲插入法重构策略,消除重构盲区,并针对该方法重构盲区出现其他扇区有效电压矢量的情况,分析其空间电压矢量合成关系,证明参考电压矢量合成的准确性;最后,基于戴维南电路法,提出不同电压矢量作用时的电路简化模型,对比两种方法的电流纹波幅值,并搭建永磁同步电机实验平台进行实验。结果表明,改进零脉冲插入法的电流重构误差低于3%,相比传统方法,电流纹波抑制效果达到50%,相电流畸变率从12.72%下降到6.87%。Aiming at current sampling distortion caused by dead-zone of phase current reconstruction in DC bus single current sampling permanent magnet synchronous motor system,improved zero pulse insertion method(IZPIM)was proposed to realize phase current reconstruction.Firstly,the disadvantages of traditional fixed zero pulse insertion method(FZPIM)was analyzed:because the zero-pulse insertion time of each phase is the same,the advantage of“double-switch PWM”mode to suppress current ripple is not played.Secondly,the IZPIM reconstruction strategy was proposed to eliminate the reconstruction blind area by adjusting the zero-pulse time and extending the current sampling window through the PWM duty ratio of each phase.The spatial voltage vector synthesis relationship was analyzed to prove the accuracy of the reference voltage vector synthesis when other sectors of effective voltage vectors appear in the IZPIM reconstruction dead-zone.Finally,based on the Devenin circuit method,a simplified circuit model with different voltage vectors was proposed,the current grain amplitude of FZPIM and IZPIM was compared,and the experimental platform of permanent magnet synchronous motor was built for experimental verification.The results show that the current reconstruction error of IZPIM is less than 3%.Compared with the traditional method,the current ripple suppression effect reaches 50%,and the phase current distortion rate decreases from 12.72%to 6.87%.

关 键 词：单电流传感 直流母线采样 相电流重构 重构盲区 永磁同步电机 零脉冲插入法 

分 类 号：TM341[电气工程—电机]