PERFORMANCE INVESTIGATION OF SHUNT ACTIVE FILTER PLACEMENT IN DISTRIBUTION SYSTEM

Abstract

In recent past year, due to rapid development in power electronics technology use of non linear load in industries as well as domestic has increased manifold. These power electronic loads possess many advantages like low cost energy efficient and their size weight and cost low. But these loads are non linear in nature. When these loads are supplied with sinusoidal voltage they draw non sinusoidal current. These non sinusoidal current when flow in the network it produce distortion in voltage. These decreases the power quality in the system. To limit the adverse effect of non linear in the system IEEE in year 1992 introduces a guidelines IEEE-519. These guideline gives how much harmonic can be present in the system. Earlier passive filter were used to mitigate the harmonic. These filter changes their impedance at tuned frequency. But these filters have many disadvantages like fixed compensation, large size and can excite resonance in the system. Active filter overcome these drawbacks. Active filter act as a controlled voltage/current source. They basically produce current/voltage in phase opposition to load current /voltage unwanted component. Traditionally one active filter on each bus on which non linear load is connected. By this 100% compensation were achieved. But these are not economically viable. So research are going to reduce the no of active filter while ensuring the level of distortion within limit specified by IEEE-5 19. In this project an approach is found to optimally place the filter such that less no of filter are used for mitigating the harmonic in the system.