基于六相静止坐标系的永磁容错轮缘推进电机模型预测电流控制

Model predictive current control based on a six-phase stationary coordinate system for fault-tolerant permanent magnet rim-driven motor

针对六相永磁容错轮缘推进电机在应用传统模型预测电流控制策略时存在计算量大、容错控制策略复杂、电机转矩脉动大的问题,本文提出一种基于六相静止坐标系的模型预测电流控制策略。在固定采样频率下,通过当前时刻转子位置、转速和故障容错控制策略计算出六相定子电流给定值,进而在六相静止坐标系下对六相电流独立地进行2轮预测,通过价值函数寻优确定六相H桥逆变电路的最优开关状态组合,实现对六相永磁容错轮缘推进电机的模型预测电流控制。结果表明:本文提出的基于六相静止坐标系的模型预测电流控制策略具有算法简单、无故障和开路故障下电机转矩脉动小的优点,同时兼顾了传统模型预测电流控制算法动态响应快的特点。

Aiming at the defects of the large calculation,complex fault-tolerant control strategy,and large pulsation of motor torque in the application of the traditional model predictive current control of a six-phase fault-tolerant permanent magnet rim-driven motor,this paper presents a model predictive current control method based on a six-phase stationary coordinate system.Under a fixed sampling frequency,a set value of a six-phase stator current is calculated using the rotor position,rotation speed at the present moment,and the fault-tolerant control strategy.Further,the six-phase current is predicted independently in two rounds under the six-phase stationary coordinate system.By optimizing the value function,the optimal switch combination for the six-phase H-bridge inverter circuit is determined to realize model predictive current control for the six-phase fault-tolerant permanent magnet rim-driven motor.The results show that the proposed model predictive current control method based on a six-phase stationary coordinate system has such advantages as its being simple and fault-free and the small pulsation of the motor torque.In addition,the method considered the fast dynamic response feature of traditional model predictive current control algorithms.