Modified Approach for Harmonic Reduction in Transmission System Using 48-pulse UPFC Employing Series Zig-Zag Primary and Y-Y Secondary Transformer
International Journal of Intelligent Systems and Applications
In this paper THD (Total Harmonic Distortion) is analysed and compared by using UPFC in a mult i-line transmission system of 500 KV having 5buses in two different arrangements. The UPFC converters are arranged as a Diode Clamped multilevel Converter (DCM LC) that leads to the cost reduction as compared with other mu lti-level converters. The comparison has been done by both series zig-zag/2Y-2Δ and series zig-zag/4Y transformer configuration for 48-pulses GTO based diode clamped converter. The
... ped converter. The THD is reduced to 42.59% and 58.82% of input waveform at bus B 2 by using series zig-zag/4Y transformer configuration. Th is transformer converter configuration also reduces the difficulty of designing the transformer winding ratio. For calculat ion of THD, FFT analysis is carried out using MATLAB. Effort of designing the turn ratio of transformer is reduced by using same arrangement. DCM LC reduces the need of AC filters as it produces low harmonic distortion content in voltage and current.