Five Levels Flying Capacitor Converter based UPFC Using Fuzzy Logic Controller to Reduces Harmonic

Abstract

In this paper, Fuzzy Logic controller (FLC) is proposed to overcome the problems of the existing five level unified power flow controller (UPFC) and to provide the dynamic power flow control through transmission lines. The basic control for the five levels UPFC is such that the series converter of the five levels UPFC controls the transmission line real/reactive power flow and the shunt converter of the five levels UPFC controls the bus voltage/shunt reactive power and the DC link capacitor voltage. In steady state, the real power demand of the series converter is supplied by the shunt converter of the five levels UPFC. To reduced reactive power and total harmonic distortion (THD) by using FLC for a five levels UPFC. The SPWM using for five levels UPFC the reactive power demand is 10MVAR and total harmonic distortion (THD) is 9.01% occurred and SVPWM is to reduce reactive power demand 9.5MVAR and total harmonic distortion (THD) 4.85%. The above two controller’s technique having more THD value this reason the FLC based five levels UPFC is proposed. The FLC based five levels UPFC is to reduced reactive power demand on 9MVAR and 1.77% of THD.  PSCAD-EMTDC simulation results have been presented to shows the improvement in the performance of the five levels UPFC control with the proposed reactive power and total harmonic distortion.