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This paper proposes method for detection, estimation of Thevenin equivalentparameters to describe power system behavior. Thevenin equivalent estimation isa challenge due to variation in system states caused by power flow in thenetwork. Thevenin equivalent calculation based on changes in system withmultiple sources integrated with grid, isolated distributed generator system isanalysed and nonlinear least square fit estimation technique for algorithm isadopted. Linear least square fit is used with a linearized model. Performanceevaluation of proposed method is carried out through mathematical model,nonlinear and linear least square fit based algorithm technique and simulationthrough MATLAB/SIMULINK package. Accurate grid and source side impedanceestimation technique is applicable for distributed generation sourcesinterfaced with grid to improve dynamic response, stability, reliability whensubjected to faults or any other disturbances in network. Algorithm canaccurately estimate Thevenin equivalent of multiple sources connected inparallel simultaneously with voltage and current phasor measurements at pointof common coupling. Mathematical analysis and simulation results validate theeffectiveness of proposed method.

Online Thevenin Equivalent Parameter Estimation using Nonlinear and Linear Recursive Least Square Algorithm