FACTS Applications to Distribution Systems

Abstract

This thesis discusses the mathematical modeling of unified power flow controller (UPFC), which is an advanced member of flexible ac transmission systems (FACTS) controller. The implementation of the device in conventional Newton–Raphson (NR) power flow algorithm is proposed. The proposed model is derived from two-voltage source representation and analyzed in detail. The model represents a more robust and feasible alternative to others, because it considers operational losses of UPFC into account. A program in Matlab language has been coded to extend conventional NR algorithm based on proposed model. A computer simulation study performed on IEEE 14-bus test system and IEEE 30-bus test system is presented to test the approach. UPFC can be theoretically located anywhere along a transmission line. In this respect, also the effect of UPFC allocation on power system operation has been investigated in detail. The power losses minimization of the power system with UPFC has been achieved using the proposed method by adjusting the location of UPFC with a proper adjustment of UPFC parameters. Also the results of optimal power flow in power system using UPFC are confirmed by one of the artificial intelligent methods which is Genetic Algorithm [GA] is studied. Results obtained by the GA method are satisfactory.