Design of PI controller using MPRS method for automatic generation control of hydropower system

In an interconnected power system with two or more independently controlled areas, any disturbance may cause a change in frequency of power system which results in instability. In addition the power interchange between the control areas is not constant. Automatic generation control regulates the frequency of the power system to the specified nominal value and maintains the power interchange between the control areas at the scheduled values by adjusting the output of selected generators. PI controller designed using Maximum peak resonance specification (MPRS) has been implemented to maintain frequency and the power interchange. The MPRS method uses the Nichols chart and it proves to be an effective and efficient method to control the overshoot, settling time and maintain the stability of the system. The results are then compared with other tuning methods of PI controller such as trial and error method and Ziegler –Nichols method.