摘要
针对开关磁阻电机(SRM)转矩脉动过大的问题,文中提出一种变滞环阈值的直接瞬时转矩控制(DITC)系统。DITC的滞环阈值一般是针对额定工况离线计算的,在额定工况附近可有效抑制转矩脉动,但偏离额定工况后转矩脉动的抑制效果会变差。文章依据SRM的转矩特性,将SRM的一个电周期划分为三个区域,并制定相应的控制策略;同时分析滞环阈值对转矩脉动的影响,探究影响滞环阈值的因素,制定基于最小二乘法模型预测的滞环阈值在线寻优方案,使SRM运行时自适应调整滞环阈值的大小,以提高瞬时输出转矩的跟随特性,实现SRM的恒转矩输出。Matlab/Simulink仿真及实验平台证明了所提DITC系统在抑制转矩脉动和优化动态性能方面的有效性,说明其在SRM高性能控制领域具有较高的实际应用价值。
In allusion to the problem of excessive torque ripple in SRM,a DITC(direct instantaneous torque control)system with variable hysteresis threshold is proposed. The hysteresis threshold of the DITC system is generally calculated off-line for rated working conditions. It can effectively suppress the torque ripple near the rated working condition,but the suppression effect of torque ripple will become worse when it deviates from the rated working condition. An electric period of SRM is divided into three segments according to the torque characteristics of the SRM,and the corresponding control strategy is made. The influence of hysteresis threshold on torque ripple is analyzed to explore the factors affecting hysteresis threshold. An on-line optimization scheme of hysteresis threshold based on the prediction of the least square method model is proposed to adaptively adjust the hysteresis threshold during SRM operation,so as to improve the following characteristics of instantaneous output torque and realize the constant torque output of SRM. The Matlab/Simulink simulation and experimental platform have verified the effectiveness of the proposed DITC system in suppressing torque ripple and optimizing dynamic performance,which has high practical application value in the field of high performance control over SRM.
作者
蔡燕
宋士华
CAI Yan;SONG Shihua(Tianjin Key Laboratory of Advanced Technology of Electrical Engineering and Energy,Tiangong University,Tianjin 300387,China)
出处
《现代电子技术》
2022年第10期87-93,共7页
Modern Electronics Technique
基金
国家自然科学基金资助项目(51777137)
天津市科技计划项目(16PTSYJC00080)。
