Voltage Stability Analysis comparing Generator Sensitivity based Method with V-Q Curve Method for Optimal Placement of STATCOM

This paper compares the coherent groups of load buses based on Reactive Reserve Margin (RRB) obtained from the V-Q curve analysis and a novel generator sensitivity based method for optimal placement of STATCOM. The V-Q curve is one of the popular methods to study voltage instability problems in power systems during the post transient period or critical peak loads. The reactive reserve margin obtained is used to determine which generators will have an impact on the maximum permissible loading of a bus. For reactive power compensation a comprehensive power injection model of STATCOM is utilized in Newton Raphson load flow algorithm. A sensitivity based method is proposed here to determine the coherent bus groups of a power system with similar reactive reserve basins under normal operating and critical load conditions. This method requires comparatively less V-Q curve computation which is a laborious procedure. The buses are categorised on account of their loading limitations. The investigations for V-Q Curve and the novel generator sensitivity method are carried out and compared on Anderson and Fouad 9 Bus Test system.