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WAMS based Thevenin Index for Voltage Stability Assessment of Power System Integrated with Wind Farm

With the increase in the penetration of the renewable resources to the existing grid, the analysis of the effect of the penetration of such sources on the system stability is one of the major concerns. The impact of the significant penetration of the DFIG based wind farm on the voltage stability of the three machine power grid is addressed in this paper. The Voltage Stability Index (Local Thevenin Index-LTI) based on Wide Area Monitoring System is used here to evaluate the voltage stability of the overall power system. This index also helps to assess the optimal location for connecting the wind-farm to the current power grid from the point of view of system stability. The modelling and simulation of the work with WSCC multi-machine 9-bus power grid is carried out on the MATLAB-Simulink environment.