Harmonic Reduction in Five Levels UPFC Using SVPWM
This paper proposed real and reactive power controlled by using SVPWM for a five level unified power flow controller (UPFC). 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 five levels UPFC 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 SVPWM 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. For this reason SVPWM is proposes to reduced reactive power demand 9.5MVAR and total harmonic distortion (THD) 4.85%. A new SVPWM for a five level UPFC has been designed to limit excessive voltage excursions during reactive power transfers. PSCAD-EMTDC simulation results have been presented to show the improvement in the performance of the five levels UPFC control with the proposed reactive power and total harmonic distortion.