基于FLC的PMSM直接转矩控制在光伏水泵系统中的应用

Direct Torque Control of PMSM based on FLC in the Application of Photovoltaic Pump System

针对光伏水泵系统中较难跟踪多种工况下的最大功率点及永磁同步电机转矩脉动较大等不足,提出一种基于模糊逻辑的永磁同步电机直接转矩控制系统。首先介绍光伏系统及永磁同步电机的结构及数学模型,其次提出直接转矩空间矢量控制及实现最大功率点跟踪的方法。最后以Matlab/Simulink软件为平台对提出的方法进行了建模与仿真。仿真结果表明,本方法能显著减小光伏水泵系统中永磁同步电机的转矩脉动和转速超调量,系统具有良好的动静态性能。

To solve the deficiency of difficult to track the maximum power point under different working conditions and high torque ripple of permanent magnet synchronous motors in the photovoltaic pump system, a novel direct torque control for permanent magnet synchronous motors based on fuzzy logic control is proposed. To begin with the structure and mathematical model of PV system and PMSM, the direct torque control based on space vector modulation is proposed and implementation method of tracking the maximum power point. Finally, modeling and simulation are carried out by taking the software of Matlab/Simulink as platform. Simulation results show that, speed characteristic can be improved and torque ripples can be diminished significantly by the proposed method for PV pump systems, so the proposed method has a good dynamic and static performance.