Modeling of Level Control System using IMC-PID Tuning Method with Filter Tuning Factor Variation on Steam Drum Boiler of Power Plant

The steam drum is one of the components in the boiler that functions to separate water from steam, before the production of dry steam in the superheater. To produce quality dry steam, the water level in the steam drum boiler must be maintained at NWL (Normally Water Level) conditions. To control the water level in the steam drum boiler, a stable control is needed and has a fast response, and is close to a real plant such as PID control. One method to determine control parameters is the Internal Model Control (IMC-PID) tuning method, the IMC-PID tuning method has a very effective performance as a controller, especially in the maximum overshoot and settling time performance parameters. To speed up the control system’s response so that it is by the desired set point, a feedback control strategy is combined with feedforward to overcome the disturbance that occurs. In this research, aims to model a steam drum level control system with several variations of filter factor ($\lambda$) values are used as particular parameters in the Internal Model Control (IMC-PID) tuning method, it shows that the performance of the designed control system can realize the set point and deal with the given disturbance. From several variations of the filter factor ($\lambda$) value, variation $\lambda$=1 with parameter value Kp=0.860; $\tau_{i}=14.07$ and $\tau_{D}=14.54$ offers the best performance when dealing with changes in the set point and disturbances of pm 5%.