摘要
针对永磁同步电机在弱磁过调制工况下产生的电流谐波大、转矩波动大等问题,提出了改进无差拍电流谐波抑制策略。本文对比分析了在模型参数不匹配的情况下改进前后无差拍控制系统的稳态误差,并且分析了改进无差拍控制算法在弱磁过调制区域对电流谐波的抑制作用,同时证明了改进无差拍控制系统的稳定性。实验结果证明了该策略的有效性。
This paper presents an improved DCC（ deadbeat current control） method for PMSM（ permanent magnet synchronous motors） in over-modulation range. The proposed method can effectively reduce current harmonics and the torque ripple in the flux-weakening over-modulation region. A low pass filter is added in the feedback loop of the deadbeat current controller,and its output can be seen as the compensation of current error. The steady-state errors of the traditional and the improved deadbeat control system with the model parameters inaccuracies are analyzed respectively in this paper. The improved deadbeat current control system can track the reference current without static error. The mechanism of the current harmonics rejection of the improved deadbeat control algorithm is studied in over-modulation region. At last,the stability of the improved deadbeat control system is proved. The experiments with a 5. 2k W prototype of permanent magnet synchronous motor are carried out. The results show that the proposed strategy can effectively suppress current harmonics and torque ripple.
出处
《电工电能新技术》
CSCD
北大核心
2015年第8期1-6,31,共7页
Advanced Technology of Electrical Engineering and Energy
基金
国家重点基础研究发展计划(973)资助项目(2013CB035602)
关键词
永磁同步电机
无差拍控制
过调制
弱磁控制
电流谐波
permanent magnet synchronous motor
deadbeat control
over-modulation
flux-weakening
current harmonics
