永磁同步电机驱动系统电流传感器容错控制

Stator current sensors’fault tolerant control for permanent magnet synchronous motor drive system

为实现永磁同步电机矢量控制系统中电流传感器的故障诊断及其容错控制,确保系统的安全性,基于矢量旋转的概念提出一种新颖的故障诊断及容错控制方法.建立3个不同轴定向的坐标系,将坐标系下α轴定子电流分量的指令值和测量值比较,判断3个电流传感器的故障信息;基于Lyapunov稳定性定理设计自适应反推观测器进行电流估计;根据3个坐标系设计逻辑判断机制,故障发生时以恰当的估计电流取代测量电流进行反馈以重构系统,保证电机在故障发生时稳定运行.仿真和实验结果证明:该策略能够有效实现永磁同步电机驱动系统中三相电流传感器的故障诊断、准确判断故障相,在重构电流过程中,αβ坐标系电流分量的选取正确而稳定,测量电流与估计电流的不同组合能够保持较高性能,维持系统的稳定性,具有较高的可行性和可靠性.

A novel fault diagnosis and fault tolerant control method was introduced based on the concept of vector rotation to realize the current sensors'fault diagnosis and tolerant control in vector control system of permanent magnet synchronous motor(PMSM),to ensure system security.In order to get the fault information of three current sensors,three coordinate systems with different axes orientation was established,and the command value and the measured value of theαcurrent components were compared.An adaptive backstepping observer was designed based on Lyapunov's stability theorem to estimate the current.Then,a logic-based detection mechanism was proposed based on the three coordinate systems;when fault occured,the measured current was replaced by the appropriate estimated current for feedback to reconstruct the system and ensure the stable operation of system.Simulations and experiments were carried out.Results show that this strategy can effectively realize the fault diagnosis of three current sensors in the PMSM drive system and accurately determine the fault phase.In the process of reconstructed current,the current component selection ofαβcoordinate system was correct and stable,and the different combinations of measured current and estimated current can maintain high performance and system stability,which verifies the effectiveness and reliability of the proposed method.