Design of Weighted Wide Area Damping Controller (WWADC) based PSS for damping inter-area Low Frequency Oscillations

Abstract

Wide Area Measurement System (WAMS) can extend and effectively improve the power system stabilizers (PSS) capability in damping the inter-area low frequency oscillations in interconnected bulk power systems. This paper proposes the implementation of Weighted Wide Area Damping Controller (WWADC) in which weighted factors are introduced for each remote feedback signals. Modal analysis approach is implemented for the purpose of identifying the optimal location as well as the input signals' optimal combination of WWADC. Based on the linearized model, Differential Evolution (DE) algorithm is applied to search for optimal controller parameters and optimal weighted factors. The successful application of the proposed approach is achieved in two power networks; the two-area 4-machine system and the IEEE-39 bus 10-machine system. The analysis of the eigenvalue and non-linear time domain simulations indicate that damping the inter-area oscillations and improving the system stability irrespective of the severity and the location of the disturbances can be effectively achieved by WADC.