Active disturbance rejection current controller with time delay compensation predictive ESO for aircraft PMSM drive

Abstract

In this paper, the authors propose a novel active disturbance rejection current control method aimed at resolving inherent issues within the digital control system of an aircraft's permanent magnet synchronous motor (PMSM). These issues include a one-sample time delay and low-pass filter in the current measurement channel. The proposed method involves estimating the time delay using a predictive extended state observer (ESO) within the current loop of the PMSM to enhance anti-disturbance capabilities and robustness. Initially, a discrete-time model that takes current loop time delay into consideration is established. Subsequently, a predictive ESO is designed to estimate disturbances within the current loop. This ESO incorporates known model information to improve the accuracy and speed of disturbance estimation. Furthermore, compensation is made for the time delay stemming from the low-pass filter in the current measurement channel to enable real-time current detection. Lastly, the disturbance estimated by predictive ESO is combined with the feedback control law to form a model-enhanced active disturbance rejection current controller. The results from simulations and experiments validate the feasibility and accuracy of the proposed methodology.