摘要
在现代工业对电力控制精度和效率要求日益提高的背景下,永磁同步电机(PMSM)因其高效率和高功率密度而在新能源汽车、工业机器人和风力发电等领域得到广泛应用.随着功率等级的提升,电机系统需要运行在低开关频率下,然而低开关频率运行条件下的控制系统设计面临着降低开关损耗与保持控制精度之间的平衡问题.传统的基于边界限定的预测控制方法虽然能有效降低开关损耗,但对电机参数变化较为敏感,当参数发生失配会降低电流轨迹的预测精度,影响最优开关状态的选择,进而影响整体控制效果.为了解决PMSM在低开关频率运行时对模型参数依赖性较高的问题,提高控制系统鲁棒性,本文提出一种基于扩张状态观测器(ESO)的预测控制策略.首先分析了参数失配对传统方法的影响,为了降低参数敏感性,引入ESO,通过建立高鲁棒性扰动观测模型,观测系统未知扰动量的总和,从而降低对电机参数的敏感性,并提高系统在面对参数失配和外部扰动时的鲁棒性.在基于TMS320F28379D主控制器的PMSM实验平台上进行实验,结果表明,在电机参数失配±50%的情况下,所提出的控制方法不仅能够保证低开关频率,还使系统具有良好的动静态特性和鲁棒性.这一成果为大功率应用中的PMSM低开关频率驱动控制提供了一种有效的解决方案.
With increasing requirements for precise and efficient power control in modern industries,permanent magnet synchronous motors(PMSMs)are widely used in new energy vehicles,industrial robots,and wind power generation owing to their high efficiency and power density.At higher power levels,motor systems must operate at low switching frequencies,requiring a delicate balance between reducing switching losses and maintaining control accuracy.Traditional predictive control methods based on circular boundary restrictions effectively reduce switching losses but are highly sensitive to changes in motor parameters.When parameter mismatches occur,the prediction accuracy of the current trajectory declines,affecting the selection of the optimal switching state and,consequently,the overall control performance.To address the problem of high reliance on model parameter values and enhance the control system’s robustness,this paper proposes a predictive control strategy based on extended state observer(ESO).This paper first analyzes how parameter mismatches impact conventional predictive control methods.To enhance the system’s robustness against parameter mismatches and external disturbances,an ESO is introduced.The ESO observes the sum of unknown system perturbations by establishing a highly robust disturbance observation model,reducing the sensitivity with respect to precise motor parameter values.Experiments on the PMSM test plat-form based on the TMS320F28379D main controller show that when the motor parameter mismatch reaches±50%,the proposed control method ensures low switching frequency operation while delivering excellent dynamic and static performance,as well as strong robustness.This result provides an effective solution for managing PMSM low switching frequency drive control in high-power applications.
作者
齐昕
徐金金
周晓敏
王辰宇
张家宁
赵宇航
Qi Xin;Xu Jinjin;Zhou Xiaomin;Wang Chenyu;Zhang Jianing;Zhao Yuhang(School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《天津大学学报(自然科学与工程技术版)》
北大核心
2025年第8期865-873,共9页
Journal of Tianjin University:Science and Technology
基金
国家自然科学基金资助项目(51407007)
佛山市人民政府科技创新专项资金资助项目(BK21BE016).
关键词
圆形边界
低开关频率
预测控制
扩张状态观测器
永磁同步电机
circular boundary
low switching frequency
predictive control
extended state observer(ESO)
permanent magnet synchronous motor(PMSM)
作者简介
齐昕(1982-),男,博士,教授,ixin2013@ustb.edu.cn;通信作者:周晓敏,zhouxiaomin@ustb.edu.cn.
