基于全维观测的模糊直接转矩控制方法研究

Fuzzy DTC of PMSM Based on Full-order Observer

此处以永磁同步电机(PMSM)为被控对象,针对其传统直接转矩控制(DTC)系统转矩和磁链脉动大的问题,提出了模糊控制的概念,并将传统DTC系统中的定子磁链积分环节用全维状态观测器代替,有效地减少了直流偏移及积分误差累积等缺点。对传统的带有定子磁链积分器的PMSM DTC系统和设计的基于定子磁链全维状态观测的PMSM模糊DTC系统分别进行实验验证,结果表明,改进后控制系统的控制性能明显优于改进前,即改进后的定子磁链和转矩脉动大幅度减小。

Using permanent magnet synchronous motor（PMSM） as the controlled object, aiming at the problem of the torque and flux linkage ripple in traditional direct torque control（DTC） system, fuzzy control concept is introduced.Si- multaneously, this paper utilizes the full-order state observer to replace the integral part of the stator flux linkage ob- server in traditional DTC which can effectively reduces the direct current drift, the integral error accumulation and other shortcomings.Through the experiments of the traditional PMSM DTC system with stator flux linkage integral ob- server and the PMSM fuzzy DTC system with full-order state observer, it can be seen that the control performance of the new fuzzy DTC system is better than the one of traditional DTC system evidently.In other word,the stator flux linkage and torque ripple of new system are decreased significantly.