Power quality assessment and improvement of 3-phase 3-wire non-linear system using instantaneous power theory based DSTATCOM

Harmonics is an eminent power quality issue confronted by the end user. It possesses several adverse effects in the electrical environment. It should be reduced for the smooth and efficient operation. In the presented study, Distribution Static Compensator (D-STATCOM) is initiated to strengthen power quality in terms of reducing harmonics. The control strategy is contingent on instantaneous power theory. The harmonics annihilation is accomplished by providing compensating current accordingly that it produces the sinusoidal wave shape source current no matter what nonlinear load in the distribution line. The harmonic current of source current is curtailed. The switching of nonlinear load yielded in 30.30 % THD (Total Harmonic Distortion) in source current. The DSTATCOM with instantaneous power theory has improved THD of source current by reducing to 2.31%. The efficacy of D-STATCOM relies too much on the control strategy that is employed to produce the compensating reference current. Besides the numerous control strategy, the instantaneous power theory proves its functionality very well. The amount of compensating current by voltage source inverter (VSI) to make the source current sinusoidal depends on the switching pattern of IGBT of VSI.