自抗扰控制器在变频调速系统中的应用

针对矢量控制系统存在的参数鲁棒性差这一难点问题,基于自抗扰控制原理,提出了将转子时间常数的变化看作磁链子系统的一种内扰,转子磁链幅值的变化对转速子系统的影响作为转速子系统的内扰,负载对转速子系统的影响作为转速子系统的外扰,并分别通过扩张状态观测器的扩张状态予以估计和补偿的感应电机变频调速系统新型控制方案. 该方案有效地解决了参数时变对矢量控制系统解耦性能的影响以及一般矢量控制系统存在的快速性与平稳性矛盾,仿真结果证明了方案的正确性与有效性.

Application of an auto-disturbances-rejection controller in variable-frequency speed regulation systems

In order to solve the poor robustness of parameters in a vector control system, a new kind of control scheme for induction-motor variable-frequency speed regulation systems was proposed based on the theory of auto-disturbances-rejection control (ADRC). In the control scheme, the change in rotor time constant was regarded as the inner disturbance of the flux subsystem, the effect of the change in rotor flux linkage amplitude and that of load as the inner and exterior disturbances of the rotate speed subsystem respectively, and the extended state of an extended state observer (ESO) was used for estimation and compensation. The control scheme can solve such problems as the effect of time-varying parameter on the decoupling performance of a vector control system and the contradiction between speediness and stability in common vector control systems. Simulated results indicated the rationality and validity of the scheme above-mentioned.