Simplified model identification of automatic voltage regulator using model-order reduction

Automatic voltage regulator (AVR) is an essential entity for power system operation. Therefore, to observe the behavior and performance of AVR, study of its modeling is necessary. Since AVR is a complex system having higher order transfer function, so it is tedious to study it. In this paper, different model reduction scheme have been discussed and implemented for this system. We have applied ten different model order reduction schemes and a descriptive study of time and frequency domain analysis has been carried out. It has been observed that although different reduced models emulate the original system but their characteristics in frequency domain vary when few specifications are taken into account, for example, gain and phase margins, notch characteristics, etc. Therefore, on the basis of requirements, system engineer has to select particular reduced model for analysis and controller synthesis.