Fast Terminal Sliding Mode Current Control With Adaptive Extended State Disturbance Observer for PMSM System

This article proposes a current decoupling control strategy by combining a fast terminal sliding mode con-trol (FTSMC) and an adaptive extended state observer (AESO). First, the voltage errors and external disturbances caused by d-q-axis current coupling and motor parameter variations are regarded as the lumped disturbance of the system, which facili-tates the decoupling of d-q-axis currents. Next, an equivalent control-based FTSMC strategy is used to track the d-q-axis currents to obtain the proper d-q-axis voltages and improve the current dynamic performance. Then, the AESO method is uti-lized to observe the lumped disturbance and compensate for the input signal. Afterward, the FTSMC and AESO algorithms are combined to obtain the appropriate current and voltage signals in the d-q-axis. Finally, simulation and experimental results show that the proposed method not only achieves complete decoupling of the d-q-axis currents, but also has good performance in terms of dynamic response, steady-state accuracy, and robustness.

Automated summary

This article proposes a current decoupling control strategy by combining FTSMC and AESO. The voltage errors and external disturbances caused by d-q-axis current coupling and motor parameter variations are regarded as a lumped disturbance, facilitating the decoupling of d-q-axis currents. The FTSMC strategy is used to track the d-q-axis currents and improve the current dynamic performance, while the AESO method observes and compensates for the lumped disturbance.