PID Tuning of Automatic Voltage Regulator

Automatic voltage regulation is an important study concerning the variation in rated voltage due to inductive and capacitive loads. Inductive loads leads to a voltage drop and capacitive load leads to a voltage rise and result in variation of voltage from its rated value. For satisfactory working of various electrical appliances, regulation in voltage is very much important, the prescribed limit for voltage variation is within ( of its normal value, so that consumer's equipment operate satisfactory (1). It is therefore, in present work we have designed automatic voltage regulator using MATLAB simulink and evaluated its performance with PID controller. The controller has been tuned using ZN closed loop Tyerus-Luyben and Astrom Hugglund methods, Singular Frequency method and IMC method. It has been observed that Tyerus-Luyben based PID controller gives the best performance among these controllers to improve the dynamic response, reduced transient and eliminate the steady state error with in minimum time. The comparative study of different PID tuning methods for automatic voltage regulation is main outcome of this paper.