V.K. Chandrakar and A.G. Kothari
Unified power flow controller, fuzzy logic controller, power oscillation damping, power system stabilizer, coordination, transient stability
The aim of the paper is to analyse the effect of coordinated fuzzy logic based unified power flow controller (UPFC) on real power flow under normal and abnormal condition, damping of transients and to improve transient stability margin of a single-machine infinite bus system and multi-machine system. A fuzzy logic approach is applied to coordinate four control inputs namely: in-phase voltage control, quadrature voltage control, real and reactive component of shunt current of a UPFC to improve the transient stability of a system. Two different controllers namely: (i) independent control of shunt and series branch of UPFC (IC), and (ii) fuzzy logic based coordinated shunt and series controller of UPFC (CFLC) are considered for comparative studies. The coordinated effect of power oscillation damping (POD) and power system stabilizer (PSS) are tested with fuzzy coordinated UPFC power flow controller. It is found that the fuzzy logic based coordinated shunt and series controller of UPFC (CFLC) provides satisfactory performance in terms of increase in power transfer capability and transient stability margin of the test system. The coordinated effect of POD and PSS with proposed fuzzy coordinated power flow controller further improve the dynamic performance of the system. Simulation of UPFC controllers is carried out with the help of MATLAB software.
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