The Implementation of Internal Model Control (IMC) With Coordinate Control Model for Steam Power Plant Using HYSYS

Steam Power Plant is one of power plant who supplies the main needs of electricity in Indonesia. The production capacity of this power plant is 45,47% from all of Indonesian power plant. Therefore, the need for operational protection to keep electricity production stable and efficient. In this research, used method of determining control strategy in the form of coordinate control to protect electricity production in steam power plant. Coordinate control is one of strategy control types that makes the load changes in generator as a feedforward signal for both control system in boilers and turbines like a parallel. This coordinate control principle using load changes signal to simultaneously after the turbine governor valve and boiler fuel control valves, with the result that this control strategy has a fast and appropriate responsibility. To simulate the flow of process control on steam power plant control using software named HYSYS. While tunning used in this researce is based on system modeling using Intenal Model Control (IMC) with first order plus dead time (FOPDT) for modeling, so this method can be believed to be able to overcome the disturbance changes in the system. In this researce given two types of testing, that is test based of set point and disturbance changes. The best IMC tunning is obtained parameters Kc = 0,24928 Ti = 1,27711 Td = 0,01383 for power control by turbine governor valve with the result of settling time = 19,54 second, maximum overshoot 0,5% and integral absolute error 80,835 when given set point change of +5% dan settling time = 11,04 second, maximum overshoot 0,3%, and integral absolute error 25 when given disturbance changes of +5%. As for controlling the pressure by throttle pressure controller, the best IMC tunning obtained parameters Kc = 3,14 Ti = 41,3 Td = 24,2 with the result of settling time = 19,54 second, maximum overshoot 10,3%, and integral absolute error 12,321 when given set point changes of +5% and settling time = 10,18 second, maximum overshoot 0,3%, and integral absolute error 67,269 when given disturbance changes of +5%.