Authors: V.B. Vikulin, A.A. Ustinov
Abstract
Voltage harmonic distortion in electrical distribution network and specifically in modern ship's network with its limited power source capacity, comparable power of the electrical consumers, abundant use of the non-linear loads such as Variable Frequency Drives (VFDs) and high density of electrical equipment arrangement can cause a significant detriment in electrical equipment performance, increases the risk of fire due to excessive heating of the cable conductors, motors and transformers caused by the increase of current and additional core loss and may lead to malfunction of the electrical and electronic equipment. This paper deals with the evaluation of the ship's power network voltage harmonic distortion in accordance with requirements of the Russian Maritime Register of Shipping Rules for the Classification and Construction of Sea-Going Ships and that of GOST R 32144-2013 Standard. The comparative analysis is done with a view to assess the additional error in evaluation of voltage harmonic distortion caused by the spectrum blur and the impact of the conducted emissions generated by VFDs to the evaluation uncertainty. The paper further outlines the difficulties in assessment of the real time harmonic distortion and provides the recommendations to ensure the reproducibility of the results. In particular, the evaluation of interharmonic subgroups and respective accepted limits are suggested.
Keywords: nonsinusoidality fast Fourier transform, harmonics, interharmonics, total harmonic distortion, harmonic distortion factor.
References
1. GOST 30804.4.7-2013 (IEC 61000-4-7:2009) Sovmestimost tehnicheskih sredstv elektromagnitnaya. Obschee rukovodstvo po sredstvam izmereniy i izmereniyam garmonik i intergarmonik dlya sistem elektrosnabzheniya i podklyuchaemyih k nim tehnicheskih sredstv [State Standard 30804.4.7-2013 (IEC 61000-4-7:2009) Compatibility of technical facilities electromagnetic. General manual for instrumentations and measurement of harmonic and interharmonic for electromotive systems and plug-in technical facilities]. Moscow, Standartinform Publ., 2013.
2. GOST 32144-2013 (EN 50160:2010, NEQ) Normyi kachestva elektricheskoy energii v sistemah elektrosnabzheniya obschego naznacheniya [State Standard 32144-2013 (EN 50160:2010, NEQ) Power quality limits in the public power supply systems]. Moscow, Standartinform Publ., 2014.
3. Rules for the Classification and Construction of Sea-Going Ships. Part XI. St. Petersburg, Russian Maritime Register o Shipping, 2016. (In Russian)
4. IACS UR E24 Harmonic distortion for ship electrical distribution system including harmonic filters.
5. Guidance notes on control of harmonics in electrical power systems. American bureau of shipping, 2006.
6. Steurer M., Ribeiro P., Liu Y. Re-evaluating electric power system harmonic distortion limits for shipboard systems. Center for advanced power systems. 2004.
About authors:
Vikulin Vladimir - FAI ″Russian Maritime Register of Shipping″, 8, Dvortsovaya Naberezhnaya, 191186, St. Petersburg, Russia, e-mail: vikulin.vb@rs-class.org
Ustinov Aleksey - PhD, FAI ″Russian Maritime Register of Shipping″, 8, Dvortsovaya Naberezhnaya, 191186, St. Petersburg, Russia, e-mail: ustinov.aa@rs-class.org
Issue: 50/51 (2018)
For citation: V.B. Vikulin, A.A. Ustinov. Some issues of voltage nonsinusoidality evaluation in shipboard electrical power system. Research Bulletin by Russian Maritime Register of Shipping. 2018, No. 50/51, pp. 63-69.
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