Computation of steady state nodal voltages for fast security assessment in power systems

Development of a method for real-time assessment of post-contingency nodal voltages is introduced. Linear network theory is applied in an algorithm that utilizes Thevenin equivalent representation of power systems as seen from every voltage-controlled node in a network. The method is evaluated by comparing with results from time domain simulations and power flow calculations using Newton-Raphson´s method. It is concluded that the developed method performs better than Newton-Raphson´s method in reproducing results from time domain simulations. Discussion includes considerations for further development for facilitating treatment of composite loads.