基于分数阶滑模观测器的三相八开关容错逆变器驱动 永磁同步电机系统无传感器FCS–MPC

Sensorless FCS–MPC using fractional-order sliding-mode observer for permanent magnet synchronous motor fed by three-phase eight-switch fault-tolerant inverter

中文关键词  三相八开关容错逆变器  电流反馈特性  有限控制集模型预测控制  永磁同步电机  分数阶滑模观测器  无速度传感器

英文关键词  three-phase eight-switch fault-tolerant inverter  current feedback characteristic  finite control set model predictive control  permanent magnet synchronous motor  fractional-order sliding-mode observer  speed sensorless

中文摘要

      针对三相八开关容错逆变器的永磁同步电机(permanent magnet synchronous motor, PMSM)驱动系统, 基于 分数阶滑模变结构技术, 提出了一种新颖的无速度传感器有限控制集模型预测控制(finite-control-set model predictive control, FCS–MPC)策略. 通过驱动系统的运行模式建立三相八开关逆变器和永磁同步电机的数学模型; 采用 分数阶滑模变结构方法构造PMSM系统转速和反电动势的观测器, 以实现对系统转速和反电动势快速准确地实时 估计; 利用改进型的FCS–MPC策略, 以达到减少控制系统计算量和电磁转矩脉动的目的, 与此同时, 本文中的电流 反馈特性的容错控制可有效抑制直流侧母线电容分压不均衡对系统运行产生的不利影响. 仿真结果表明, 该方法能 够保证八开关容错逆变器驱动PMSM系统可靠稳定运行、具有良好的动态性能, 并能降低定子电流总谐波失真值.

英文摘要

      Based on three-phase eight-switch inverter, a novel sensorless finite-control-set model predictive control (FCS–MPC) strategy is proposed for the permanent magnet synchronous motor (PMSM) drive system with fractionalorder sliding-mode observer. Firstly, the mathematical models of three-phase eight-switch inverter and permanent magnet synchronous motor (PMSM) are established by the operating mode of a driving system. Secondly, by using the technique of fractional-order sliding-mode observer, an observer is constructed to realize fast and accurate real-time estimation of system speed and counter electromotive force. Finally, using improved FCS–MPC strategy to reduce the calculation amount and electromagnetic torque ripple of the control system. Meanwhile the fault tolerant control with current feedback characteristic provided by the method can effectively suppress the adverse effect resulting from the two capacitor voltage’s unbalance of DC bus terminal in three-phase eight-switch inverter. The simulation results demonstrate that the proposed method can enable whole system to not only run reliably and stably, but also achieve satisfactory dynamic performance as well as lower the total harmonic value of stator current