DESIGN OF SPEED CONTROL SYSTEM FOR SWITCHED RELUCTANCE MOTOR WITH DISCRETE TIME PI CONTROLLER

• Main Author: Rizal Ridwan Mattulada, Achmad
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/86852
• Institution: Institut Teknologi Bandung

Determination of PI controller parameters in real systems with unknown models requires good initial tuning of the parameters. This study aims to evaluate the performance of the Switched Reluctance Motor (SRM) speed control system with initial tuning of the Proportional-Integral (PI) controller using the Ziegler- Nichols (open-loop), Cohen-Coon, and PI Tuner parameter tuning methods. For simulation purposes, the SRM system model is expressed in the form of a transfer function obtained through an identification process using MATLAB based on SRM input-output measurement data. The discrete time transfer function is obtained by the Zero-Order Hold (ZOH) approach. Simulations are performed in both continuous and discrete time domains to analyze the difference in the performance of the control system in both time domains. Simulation results show that in the continuous time domain, the Ziegler-Nichols method gives a fast system response with the fastest rise time, but has a high over-shoot and indicates potential instability. The Cohen-Coon method produces the smallest control signal energy with a more stable response time than Ziegler-Nichols, although it still has a significant over-shoot. Meanwhile, PI Tuner shows the best performance with fast response time, minimal over-shoot, and maintained stability. In the discrete time domain, the Ziegler-Nichols method is unstable because the controller parameters are too large. Cohen-Coon provides fast response, but with high overshoot. PI Tuner is again the most optimal method with a balance between speed, stability, and control signal energy. Based on simulation results and as an initial tuning method, PI Tuner is the most superior PI controller parameter tuning method for both domains, continuous and discrete time, especially for applications that require fast response and maintained stability. Furthermore, the selected discrete-time PI controller needs further testing through digital hardware implementation.