Abstract
Unified power flow controller (UPFC) is a multifunction flexible AC transmission system (FACTS) device with capability of performing such several functions as active and reactive power flow, voltage and stability control in a power system. It is well-known that strong interactions exist between active and reactive power flow control functions of a UPFC. From another point of view, there are also interactions within internal parts of UPFC and also between UPFC and power system. In this paper, considering power system and UPFC's model as a unit including series and shunt converters, common DC link and thevenin equivalent circuits of power system on either sides of UPFC, in addition to interaction analysis, a singular value decomposition (SVD) controller will be designed for active and reactive power flow control. In order to evaluate the performance of the proposed controller, computer simulation using MATLAB/SIMULINK software has been provided comparing performance of the proposed controller with decoupling matrix (DM) and proportional-integral (PI) controllers. Simulation results have clearly confirmed the competence of SVD over DM and PI.
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