Dynamic analysis of Single Machine Infinite Bus system using Single input and Dual input PSS

Abstract

This paper deals with the design of both single input and dual input conventional PSS which is used to damp the low frequency rotor oscillations taking place in power systems. The single input PSS used here are power based derivative type and speed based lead-lag type stabilizer, the dual input stabilizer, PSS3B has two inputs namely from change in speed and deviation of electrical power and has two frequency bands, lower and higher unlike the single input PSS. The PSS parameters are tuned, considering the machine data and operating point of the system used. The optimal parameters of the PSS are obtained using pole placement and genetic algorithm technique and the respective results are compared graphically .The system used is Single Machine Infinite Bus (SMIB) system which is modelled using state space analysis and its dynamic response is analyzed both for system without PSS and with PSS (both single and dual input) using Simulink/Matlab.