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Changes in load on electric power systems are unavoidable at all times. But the increase in load that is not accompanied by additional capacity will cause the system to operate abnormally. The normal or abnormal condition of the power system leads to electrical voltage problems. Excessive reactive power can damage the generator stator windings due to increased stator currents. Increased stator current can be overcome by increasing the generator voltage. In order for this incident to not occur, an AVR can be used to adjust the generator voltage according to the increase in reactive power. Automatic Voltage Regulator (AVR) Controller Design Analysis using Matlab program with simulink method using Routh’s Criteria. Matlab programming simulation results and Routh's criteria analysis showed that the PID controller was able to reduce oscillations occured and the system quickly returned to a stable condition even though there was a change in load (interference) by adjusting the P (proportional), I (integrative) and D (devirative) parameters. In this case, the AVR performance was changed by setting the root value in the characteristic equation so that the constants Kp = 0.016135, Ki = 0.01815 and Kd = 0.00359 were obtained. This value was able to maintain the generator voltage output at the time of interference with settling time (ts) of 0.89594 and maximum overshoot of 25%.

Automatic Voltage Regulator (AVR) Controller Design Based on Routh’s Crution Stability Analysis in Diesel-Based Power Plants