Main Article Content


This paper will present a review of characteristic harmonics in both single phase and three phase drive front end rectifiers, discuss recent research findings in identifying sources and production of non-characteristic harmonics and amplification of harmonic levels when the front end rectifiers are fed from non-ideal supply conditions. Significant amount of triplens may be generated due to unbalances in utility supply voltage wave form and anticipated harmonic levels may vary widely. The paper will also discuss international harmonic standards such as the AS 2279, IEEE 519, and IEC 61000 series applicable to rectifier loads. Finally, the paper will present techniques to reduce harmonic levels by mixing of single phase and three phase non-linear loads resulting from mutual cancellations.




Harmonics THD 3rd harmonic Triplen Harmonic Supply Imbalance Voltage Distortion Non-Characteristic Harmonics Harmonic Standards and Harmonic Cancellations.

Article Details


  1. GARY, W.K.CHANG. and WILSUN, X.U. 1998. Modelling of Harmonic Sources; Power Electronic Converters, Tutorial on Harmonics Modelling and Simulation, IEEE Power Engineering Society, 98TP125-0, 28-34.
  2. CYRIL, W.LANDER. 1987. Power Electronics 2nd Edition. London: McGraw-Hill, 259-274.
  3. ALI, I.MASWOOD. and GEZA JOOS. 1991, Problems and Solutions Associated with the Operation of Phase-Controlled Rectifiers under Unbalanced Input Voltage Conditions, IEEE Transactions on Industry Applications, 27(4): 765-72.
  4. MARK, F. MCGRANAGHAN. and DAVID, R.MUELLER. 1999. Designing Harmonic Filters for Adjustable-Speed Drives to Comply with IEEE-519 Harmonic Limits, IEEE Transactions Industry Applications, 35(2): 312-318
  5. MOHAN, UNDELAND, ROBBINS. 1995. Power Electronics: Converters, Applications and Design, 2nd Edition. New York: John Wiley & Sons INC., 103-113.
  6. DEREK, A.PAICE. 1996. Power Electronic Converter Harmonics: Multipulse Methods for Clean Power. New Jersey: IEEE Press, 15-23 and 97-113.
  7. SYED, M.PEERAN. and CREG, W.P.CASCADDEN. 1995. Application, Design and Specification of Harmonic Filters for Variable Frequency Drives, IEEE Transactions on Industry Applications, 31(4): 841-847.
  8. W.Xu. and RANDAE. 1998. Analysis of Unbalanced Harmonic Propagation in Multiphase Power Systems, Tutorial on Harmonics Modelling and Simulation, IEEE Power Engineering Society. 98TP125-0, 61-66.
  9. STEFFAN HANSEN, PETER NIELSEN. and BLAABJERG, F. 2000, Harmonic Cancellation by Mixing Non-Linear Single Phase and Three Phase Loads, IEEE Trans on Industry Applications, 36(1): 152-159.
  10. DEREK, A.PAICE. 1996. Power Electronic Converter Harmonics, IEEE Press.