基于无差拍电流预测控制的六相PMSM容错控制  

Six-phase PMSM Fault-tolerant Control Based on Deadbeat Predictive Current Control

作　　者：徐磊[1] 许强[1] XU Lei;XU Qiang(Huazhong University of Science and Technology,Wuhan 430074)

机构地区：[1]华中科技大学,武汉430074

出　　处：《导航与控制》2021年第5期113-120,共8页Navigation and Control

摘　　要：缺相后的容错控制对于多相电机的控制是一大热点,传统的PI控制器在容错控制中性能受到限制,针对六相永磁同步电机单相断路故障的情况,以两套绕组中性点连接且不连至逆变器端为例,基于定子磁动势不变的原则,以定子电流幅值最小为优化目标求解出定子端剩余相电流,然后建立剩余五相绕组的数学模型,并利用相应的变换矩阵通过构造新的旋转坐标系进行矢量解耦,提出了六相电机在一相断路故障下的矢量控制策略。为进一步改善缺相故障后的控制效果,提出了一种无差拍电流预测控制策略,对电机的数学模型进行离散化处理,用电流预测控制器来取代传统的比例积分电流调节器,实现六相永磁同步电机缺相故障下的无差拍电流预测控制,并基于Matlab/Simulink完成仿真建模和对比分析,验证了控制策略的可行性。The fault-tolerant control after a phase failure is a hot spot for the control of multiphase motor. The traditional PI controller could be limited in the neutral of fault-tolerant control. Aiming at the single-phase open circuit fault of a six-phase permanent magnet synchronous motor(PMSM), taking the neutral point of two sets of windings connected and not connected to the inverter end as an example, based on the principle of constant stator magnetomotive force and taking the minimum amplitude of stator current as the optimization objective, the residual phase current at the stator end is solved, and then the mathematical model of the remaining five-phase windings is established. By using the corresponding transformation matrix and constructing a new rotating coordinate system for vector decoupling, the vector control strategy of the six-phase motor under one-phase open circuit fault is proposed. In order to further improve the control effect after a phase failure, a deadbeat predictive current control strategy is proposed. The mathematical model of the motor is discretized, and the current predictive controller is used to replace the traditional PI current regulator to achieve the deadbeat predictive current control under phase failure of six-phase PMSM. The simulation modeling and comparative analysis are completed based on Matlab/Simulink to verify the feasibility of the control strategy.

关 键 词：六相永磁同步电机 电流控制 容错控制 无差拍电流预测控制 

分 类 号：TP24[自动化与计算机技术—检测技术与自动化装置]