Indonesia Conference Directory

Quality and reliability in electric power systems can be measured by the best value of frequency, voltage, and number of disturbances. One of the problems of the electric power system is the frequency regulation because related to power generated and loading. Changing in load will contribute in changing of frequency then frequency settings are needed by controlling the generator rotation according to load fluctuations using LFC (Load Frequency Control). The Load frequency control prototype made to simulate a system that was almost the same as a power plant in the field but the capacity is lower, several experiments carried out namely open loop, close loop without PID and close loop with PID in load conditions monitored through SCADA. The results of several experiments were carried out and then analysed which were response of the stability of the frequency and speed. PID values obtained from the calculation of the Ziegler Nichols method, Auto Tuning and Try & Error. PID Ziegler Nichols method was used in close loop experiments with a value of Kp = 1 Kd = 0.115 Ki = 0.49. This method was able to improve the frequency of 49.42 Hz at 1 Nm load and 48.41 Hz at 3.5 Nm load. However, other experiments and methods at lower frequency at the same set point of 50 Hz , the transient stability using Ziegler Nichols method has a rise time greater than the other methods of 21.09 ms, the overshoot value in this method is relatively small, 0.492% and settling time 0.03 seconds. Then, the system response is stable before 0.14 seconds even though there is a steady state error of 0.004. Therefore, the load changes affect the stability response of the Ziegler Nichols method is faster than the other methods.