永磁同步电机新型直接转矩控制系统设计

Design of novel direct torque control system for PMSM

针对传统的直接转矩控制转矩脉动大、开关频率不恒定等问题,在分析永磁同步电机数学模型的基础上,综合矢量控制的特点,提出一种基于空间矢量脉宽调制的新型直接转矩控制系统,用PI调节器取代滞环控制器,用空间矢量脉宽调制取代开关表。同时为了提高系统性能,模糊控制被应用于该系统。在Matlab环境下建立永磁同步电机新型直接转矩控制系统仿真模型并进行仿真研究,仿真结果证明了新型直接转矩控制系统设计可行有效,在提高系统响应速度的同时,能有效减小转矩和磁链的脉动,改善控制系统的性能。

To solve the problems of torque ripple and inconstant inverter switching frequency in the conventional direct torque control （DTC）, a novel DTC method using space vector pulse width modulation （SVM）is proposed based on analysis of permanent magnet synchronous motor （PMSM）mathematical model. Hysteresis controller is substituted by PX controller and switch table is substituted by SVM. In order to improve system performance, fuzzy control is used in the system. PMSM drive simulation model with novel DTC is created and studied by using MATLAB. The simulation results demonstrate the feasibility and validity of the proposed DTC system. The novel DTC system may expedite system response, effectively reduce torque and flux ripple and improve system performance.