摘要
永磁同步电机电磁转矩和负载角之间的非线性关系,容易导致永磁同步电机失步,限制了其在高速度、高精度领域的应用。针对此问题,提出了一种基于模型预测的永磁同步电机直接转矩控制及负载角限制方法。详细介绍了永磁同步电机的离散时间状态空间模型,可用于提高状态预测精度。阐述了电机预测过程,并设计了一种评价函数,包括性能评价函数和限制评价函数,前者可用于消除电机电磁转矩和定子磁链幅值误差,以实现设定值跟踪;后者可用于限制负载角。为补偿测量和执行之间的延时,给出了一种延时补偿方法。最后,进行了仿真和实验研究,结果表明该方法具有良好的跟踪性能,可以提高直接转矩控制的控制性能,而且可以较好地限制电机的负载角。
It is easy to cause step out because of the nonlinear relation between electromagnetic torque and load anglein permanent magnet synchronous motor （PMSM）. As a result, its application in many fields required high speed or precisionis limited. The purpose of this paper is to describe a model predictive direct torque control （ MP-DTC） with load anglelimitation for PMSM drive system. An exact discrete-time state-space model of PMSM was presented, which improved thestate prediction accuracy. And the forecast process was also expounded. An evaluation function was designed, includingperformance evaluation function and limitation evaluation function. The former can be used to eliminate the error of electromagnetictorque and stator flux linkage amplitude and realize the setpoint tracking. The latter can be used to limit load angle.To eliminate the time delay between measurement and execution, a time delay compensation method was presented.Finally, the simulation and experimental study were carried on. The results show that the method described in this articlehas good tracking performance. It can improve the control performance of direct torque control and has better load anglelimitation of the motor.
出处
《微特电机》
北大核心
2016年第8期126-130,共5页
Small & Special Electrical Machines
关键词
模型预测控制
直接转矩控制
负载角限制
永磁同步电机
model predictive control
direct torque control
load angle limitation
permanent magnet synchronous motor（PMSM）
