Performance evaluation of AC-DC filters for chandrapur-padghe bipolar HVDC link

Harmonics problem generated by nonlinear loads and thyristor converters becomes increasingly serious as they are widely used in industrial applications and transmission and/or distribution systems. Since the HVDC converters are large power converters, they have become important harmonic sources in power systems. In addition to characteristic and non characteristic harmonics, there is every probability of generation of unusual or abnormal harmonics due to firing angle errors and unbalance in the supply voltage. Proper compensation of harmonics thus generated is essential to improve the quality of power in systems. A scheme, that explores existing set up with few additions and provides continuous measurement and detail analysis of the harmonics as well as analysis of filter performance, is proposed in this paper.