Robust Composite Finite-Time Convergent Speed Control of Induction Machine Based on Multiple Sources Disturbance Estimation Technology Generalized Proportional Integral Observer

To improve the robustness of the conventional finite-time convergent speed controller (FTCSC) against unpredictable disturbances, a finite-time generalized proportional integral observer (FT-GPIO) is proposed based on the state observer to achieve finite-time convergence of the closed-loop control system. First, an FTCSC is devised to improve the speed convergence performance of the induction machine (IM) control system. However, the system will inevitably be affected by multiple sources disturbances, such as friction, load disturbance, parameter mismatch, and torque current tracking error, resulting in performance degradation. To improve the disturbance rejection ability of the IM control system, an FT-GPIO based on multiple sources disturbance estimation technology is designed. Finally, a 1.1-kW IM is used as a case study, and the experimental results are provided to verify the effectiveness of the proposed robust composite finite-time convergent speed controller.