A Stable Sliding Mode Control Device for Controlling the Speed and Terminal Current of Permanent Magnet Synchronous Motor Drive

Electrical Engineering

In this paper, we investigate a terminal sliding mode control approach based on nonlinear disturbance observer to implement the speed and current tracking control for PMSM drive system. Instead of using the conventional cascade control in the vector control of PMSM, the suggested method utilizes a speed-current single-loop control structure. Initially, using feedback linearization technology, a single-loop terminal sliding mode controller is created for the PMSM drive system while taking into account the nonlinear and coupling characteristics. This technique can achieve a quick transient response by allowing the motor speed and current to reach the reference value for an unlimited amount of time. The sliding mode control may provide a strong switching gain, which could result in the undesirable chattering, although being less sensitive to parameter uncertainties and outside disturbances. In the meantime, the presence of mismatched uncertainty prevents the sliding mode control from maintaining the property of invariance. The lump disturbance is then estimated using a nonlinear disturbance observer and employed in the feed-forward compensation control. As a result, the PMSM drive system is given a composite control scheme. The outcomes demonstrate that the motor control system based on the suggested method has great robustness, good speed and current tracking performance, and both.

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