Model Order Reduction of Single Machine Infinite Bus Power System

The reduced order model (ROM) of power system can be obtained by the approximation method. It makes analysis, synthesis and controller design of the system easier and economical and less time consuming. To obtain the reduced denominator, a dominant pole retention method is used considering three different cases. Reduced numerator is obtained by using a simplistic mathematical algorithm. Responses of time and frequency of the reduced models obtained by three cases of dominant pole retention method are compared with the other popular reduction techniques like simple and modified Hankel Norm Approximation Balanced truncation and Routh Approximation. The performance indices were calculated and analyzed to determine the effective and accurate reduction method for a given power system model. The reduction methods applied, guarantee the stable reduced models for the stable original power system model. It also ensures that the fundamental characteristics of the actual higher order power system would be held by the reduced models.