| Summary: | Increasing power from low power (10 kW) to high power (1 MW) and load change because of demand electricity will result in turbine rotation speed changes from its steady state value. If the condition allowed continuously, it will break the electrical appliances because that frequency change from its standard which 50 Hz (SNI 04-1922-2002), break the turbine components, such as turbine blade loose and also break generator, such as generator is burned because of high current. Therefore a controll system is needed to keep turbine rotation speed to return back to 3000 RPM (314 rad/s). Power plant in this case is a mini power plant with power 1 MW.
The method which is used in this case is the Root Locus method with type of controller is PI (Proportional Integral). Controlling result values of Kp is 0.7539 and values of Ki is 0.007539. Base testing using input step and ramp, show that controll system that is designed can keep turbine rotation speed to return back to 3000 RPM with various kind condition, such increasing power from low power (10 kW) to high power (1 MW) and also while happens increase and decrease demand consumer.
Keywords: turbine, controllers, turbine rotation speed, Root Locus
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