Design of SCADA for Load Frequency Control prototype using PLC controller with PID algorithm

Frequency deviation from the nominal value of 50 Hz must be within the allowable tolerance limit of 2%. Load changes contributes to vary the frequency then settings are needed using LFC (Load Frequency Control) which controls speed of generator. From the issue, the research is about of making a learning prototype for the control system. Frequency is set using a Programmable Logic control (PLC) Twido TWDLMDA20DUK by using a Proportional Integral Derivative (PID) algorithm and can be supervised via SCADA. The results of experiments were analysed their stability of frequency and speed. PID values are obtained from Ziegler Nichols method and Auto Tuning. Close loop experiments shows that with a value of Kp = 1 Kd = 0.115 Ki = 0.49 can improve the frequency 49.41 Hz at 3.5 Nm load. The transient response at steady state which is 50 Hz, the Ziegler Nichols method has a rise time value greater than the other methods of 21.09 ms, the overshoot is relatively small, 0.492%, settling time 0.03s and steady state error of 0.004 so that when the load changes the stability response of the Ziegler Nichols method is faster than the other methods.