A. Joseline  Metilda, C. Sharmeela  , 
    Mitigation of Harmonics Using Three-Phase Four-Wire Shunt Active Power Filter,
    International Journal of Soft Computing,
    Volume 9,Issue 3,
    2014,
    Pages 156-159,
    ISSN 1816-9503,
    ijscomp.2014.156.159,
    (https://makhillpublications.co/view-article.php?doi=ijscomp.2014.156.159)
    Abstract: With the abundant increase of power electronic equipments and the application 
  of various non-linear devices, the distortion in current due to various power 
  quality problems affects the grid to a wider extent. This has lead to a greater 
  focus on harmonic current compensation in recent years which can be attained 
  by the use of active power filters. Active filters are sophisticated power electronic 
  devices which can overcome power quality problems. This study focuses on the 
  mitigation of harmonics by using shunt active filter. Active power filter is 
  an efficient power electronic device being used for eliminating power quality 
  problems. It can compensate harmonics with varying amplitude and frequency and 
  can overcome the shortage of passive filter effectively.
    Keywords: Shunt active power filter;Instantaneous Reactive Power theory;harmonics;Three Phase Four Wire System;total harmonic distortion;hysteresis controller