直接转矩控制中一种改进的定子磁链观测方法的研究

直接转矩控制技术作为一种被广泛使用的高性能交流电机调速策略,具有控制结构简单,转矩响应迅速,受电机参数变化影响小的优点。然而,传统直接转矩控制技术所采用的基于u-i模型的定子磁链观测器,由于纯积分环节的存在不可避免的带来了直流量的累积,进而产生定子磁链的观测误差。针对上述问题,给出了一种对幅值和相位进行补偿的基于低通滤波器的定子磁链观测器模型,通过仿真分析验证了该方法的正确性和有效性。

Research on an Improved Stator Flux Linkage Observation Method in Direct Torque Control System

Direct Torque Control (DTC), which is widely used as a high-performance alternating current machine motor speed-controlled strategy, has the advantages of simple controlling structure, fast torque response and little influence affected by motor parameters. However , traditional DTC based on the stator flux linkage observer of the u-I model would produce the error of the stator flux linkage, due to the existence of the pure integral element which inevitable brings the accumulation of direct current. Aiming at this issue, a kind of an improved stator flux linkage observation method based on a low-pass fliter was presented. Simulation results show this method is correct and effective.