A Comparative Study on Power System Harmonics for Offshore Plants

해양플랜트 전력시스템의 고조파 비교분석에 관한 연구

  • Kim, Deok-Ki (FLNG FEED Team, Hyundai Heavy Industries Co. Ltd.) ;
  • Lee, Won-Ju (Korea Institute of Maritime and Fisheries Technology) ;
  • Kim, Jong-Su (Division of Marine System Engineering, Korea Maritime and Ocean University)
  • 김덕기 (현대중공업 FLNG FEED팀) ;
  • 이원주 (한국해양수산연수원) ;
  • 김종수 (한국해양대학교 기관시스템공학부)
  • Received : 2016.12.06
  • Accepted : 2016.12.28
  • Published : 2016.12.31


The field of power system harmonics has been receiving a great deal of attention recently. This is primarily due to the fact that non-linear (or harmonic-producing) loads comprise an ever-increasing portion of what is handled at a typical industrial plant. The incidence rate of harmonic-related problems is low, but awareness of harmonic issues can still help increase offshore power plant system reliability. On the rare occasion that harmonics become a problem, this is either due to the magnitude of harmonics produced or power system resonance. This harmonic study used an electrical configuration for the offloading scenario of a Floating LNG (FLNG) unit, considering power load. This electrical network configuration is visible in the electrical network load flow study part of the project. This study has been carried out to evaluate the performance of an electric power system, focusing on the harmonic efficiency of an electrically driven motor system to ensure offshore plant safety. In addition, the design part of this study analyzed the electric power system of an FLNG unit to improve the safety of operation and maintenance.


  1. Arrillage, J., B. C. Smith, N. R. Watson and A. R. Wood (1997), Power System Harmonics, John Wiley & Sons Ltd., pp. 1-369.
  2. Bose, K.(1997), Power Electronics and Variable Frequency Drives, Technology and Application, New York, USA, IEEE Press, pp. 1-630.
  3. Elgerd, O. I. and P. D. van der Puije(1998), Electrical Power Engineering, ITP, pp. 202-207.
  4. Gőnen, T.(2007), Electrical Power Distribution System Engineering, CRC Press, pp. 632-650.
  5. IEC 61000-3-2(2014), Electromagnetic Compatibility (EMC)- Part 3: Limits-Section 2: Limits for harmonic current emissions (equipment input current ${\leq}$16A per phase)- Basic EMC publication, pp. 1-69.
  6. IEC 61000-3-6(2008), Electromagnetic Compatibility (EMC)- Part 3-6: Limits-Assessment of emission limits for the connection of distorting installations to MV and HV and EHV power systems-Basic EMC publication, pp. 1-58.
  7. Kim, S. H., J. S. Kim, S. G. Oh and K. K. Yoon(2014), A harmonic reduction scheme for 12-pulse diode rectifiers by auxiliary voltage supply, Journal of the Korean Society of Marine Engineering, Vol. 38, No. 7 pp. 916-922.