Abstract:
In this research, an investigation is conducted into a terminal sliding mode control (SMC) approach that is based on a nonlinear disturbance observer. The purpose of this investigation is to realize the speed and the current tracking control for the permanent magnet synchronous motor (PMSM) drive system.
When it comes to the vector control of the PMSM, the proposed solution utilizes the speed-current single-loop control structure rather than the conventional cascade control. First, a single-loop terminal sliding mode controller is constructed for a PMSM drive system using feedback linearization technology.
This controller takes into consideration the nonlinear and coupling characteristics of the system. This technique has the capability of bringing the motor speed and current to the reference value in a finite amount of time, which enables the fast transient response to be carried out.
Even while the SMC is less susceptible to variations in the parameters and disturbances from the outside world, it still has the potential to generate a significant switching gain, which could result in the undesirable chattering. In the meanwhile, the SMC is unable to maintain the property of invariance when there are uncertainties that are not related to one another.
Then, in order to estimate the lump disturbance, which is utilized in the feed-forward compensation control, a nonlinear disturbance observer is provided as a solution. Therefore, a composite control scheme is devised for the PMSM drive system in order to achieve this.
According to the findings, the motor control system that is based on the method that was proposed possesses significant robustness as well as outstanding performance in terms of tracking speed and current.
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