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 improved zero pulse insertion method
陈思宇 1向学位 1李辉 1周豪 1蒋鹏1
作者信息
- 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
- 折叠
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%.
Abstract
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 inser-tion 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 accu-racy 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 mod-el with different voltage vectors was proposed,the current grain amplitude of FZPIM and IZPIM was com-pared,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Key words
single current sensor/DC bus sampling/phase current reconstruction/reconstruction dead-zone/permanent magnet synchronous motor/zero pulse insertion method引用本文复制引用
基金项目
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)
出版年
2024
NETL
NSTL
万方数据