Power Filters to Reduce Harmonics to Improve Power Quality

This paper focuses towards implementation of hybrid activepower filter for compensation of harmonics to improve power quality.Development in smart grid technology created a higher demand forimproved power quality. Harmonics are the main constraints forpoor power quality. Adjustable-speed drives, switching powersupplies, arc furnaces, electronic fluorescent lamp ballasts, lightningstrike, L-G fault are the sources of poor power quality. Non linearloads are the major source of harmonics in modern power system.The problems associated with power quality are voltage sags, voltageswells, interruption, sustained interruptions, over voltage, undervoltage, long-duration voltage variations, voltage imbalance, andwaveform distortion. To overcome these problems motivated todesign the hybrid active power filter. For the improvement of powerquality hybrid filter amongst other involves the use of both thepassive filter and shunt APF in combination are being used toeliminate both higher and lower order harmonics. The p-q method isused for harmonic suppression. The expected properties of shunthybrid power filter have been confirmed by simulation test inMATLAB/simulin