摘要
针对传统模型预测转矩控制存在的在线计算量大、最优权重系数难以确定等问题,提出一种改进型永磁同步电机模型预测转矩控制方法。通过在d-q旋转坐标系下建立表贴式永磁同步电机模型,由预测转矩控制目标确定模型预测所需的参数预测值,将转矩和磁链进行标幺化处理,并将转矩误差和磁链误差转换成转矩误差率和磁链误差率,再加入磁链约束方程得到无权重系数的代价函数。同时采用简化电流预测的计算方法,降低预测过程中的核心计算量。仿真结果表明,所提方法在保证控制性能的同时可以显著降低系统在线计算量,而且谐波幅值显著降低,改善了波形质量,提高了电压利用率。
In view of the flaws of large amount of on-line calculation and difficulty in the determination of the optimal weight coefficient in the traditional model predictive torque control,an improved model predictive torque control method has thus been proposed for the permanent magnet synchronous motor.Based on an establishment of a surface-mounted permanent magnet synchronous motor model in the d-q rotating coordinate system,the predicted parameters required for model prediction can be determined by the predicted torque control target,with the torque and flux standardized,and the torque error and flux error transformed into torque error rate and flux error rate,to be followed by the addition of the flux constraint equation to obtain the cost function of weightless coefficient.Meanwhile,a simplified current prediction calculation method is adopted to reduce the amount of core calculation in the forecasting process.Simulation results show that the proposed method can significantly reduce the amount of system online calculation while ensuring the control performance,and markedly reduce the harmonic amplitude,thus improving the waveform quality and the voltage utilization as well.
作者
熊永跃
李光中
石川东
舒中宾
XIONG Yongyue;LI Guangzhong;SHI Chuandong;SHU Zhongbin(College of Electrical and Informatica Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China)
出处
《湖南工业大学学报》
2022年第2期15-23,共9页
Journal of Hunan University of Technology
基金
湖南省教育厅科学研究基金资助项目(20C0642)。
关键词
永磁同步电机
模型预测控制
直接转矩控制
代价函数
permanent magnet synchronous motor
model predictive control
direct torque control
cost function
