Research on a bipolar-pulse electrostatic elimination system based on a Smith–PI predictor controller

To address the issue of ion-balance shift in electrostatic eliminators over time, a control scheme for the ion-current balance was developed and a bipolar-pulse electrostatic elimination system was constructed. To enhance the control performance of the system, a Smith–PI predictor controller was used to compensate for system time delay. Additionally, a dynamic simulation model of the electrostatic elimination system was established, and the simulation results showed that the method could ensure the stability of the system and provide a satisfactory dynamic response, even in the presence of a time delay in the system. An electrostatic elimination platform was constructed for experimental purposes, and the experimental results indicated that the PI control exhibited an obvious overshooting phenomenon, whereas the Smith–PI predictor controller responded quickly and did not demonstrate any obvious overshooting. This suggests that the Smith–PI predictor controller can effectively compensate for the time delay in electrostatic eliminators.