Ramtharan, G.Abeyratne, S.G.Atputharajah, A.2010-07-062010-07-062006Journal of the National Science Foundation of Sri Lanka, 34(1):p.21-28https://dl.nsf.gov.lk/handle/1/6359Power electronicsHarmonic eliminationPower factor improvementActive power filterHarmonic filterPQ-theoryPower qualityEngineering and TechnologyConstant frequency control of an active power filterArticle