ANALYSIS AND MITIGATION OF HARMONICS IN 11KV DISTRIBUTION SYSTEM

Power quality is major problem in power distribution system and harmonic distortion is one of them. Harmonic distortion problem occurs due to uses of nonlinear loads like adjustable speed drives, power electronics converters, electronic ballasts etc.. Large considerations of these nonlinear loads have the potential to raise harmonic voltage and currents in a power distribution system to unacceptable high levels that can adversely affect the system. In this paper we consider 11kv distribution line and for mitigation of this harmonic distortion, shunt active power filter is widely used in a distribution system. We are interested Shunt active power filter using instantaneous active and reactive power (p-q) theory for compensating the load current harmonics and reactive power. The advantage of the p-q theory is that it is instantaneous and it works in the time domain