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Harmonics in power systems of ships with electrical propulsion drives. Effects on the equipment

Abstract

In this report the effect of harmonics on the power system equipment and loads, with special attention given to the circumstances in ships, is discussed. Some guidelines are given for the computation of additional harmonic losses in power cables and transformers. It is also shown, that if the system is rich in harmonics, these losses must be taken into account when sizing the equipment. The effect of harmonics on electrical machines is also discussed. The influence on induction machines is usually small. However, in large synchronous machines a significant degree of harmonic losses may be expected. Especially in the high voltage system the harmonics must be taken into account when selecting the machine ratings. Also the harmonic resonances, which may arise when using reactive power compensation capacitors, are discussed. Due to the risk of harmonic resonances, the use of capacitors is not recommended in marine power systems. Also the immunity of different load devices to harmonic distortion is discussed. The equipment considered are resistive loads, discharge lamps, universal machines and electronic equipment. Finally a brief survey is given on the standards and recommendations for the maximum distortion levels allowed. (author)
Authors:
Lehtonen, M [1] 
  1. VTT Energy, Espoo (Finland). Energy Systems
Publication Date:
Nov 01, 1996
Product Type:
Technical Report
Report Number:
VTT-TIED-1722-Pt.1
Reference Number:
SCA: 240100; 330300; PA: FI-96:003776; EDB-96:164792; NTS-97:004527; SN: 96001691589
Resource Relation:
Other Information: PBD: 1996
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; 33 ADVANCED PROPULSION SYSTEMS; ELECTRIC MOTORS; HARMONICS; SHIPS; PROPULSION SYSTEMS; POWER SYSTEMS; POWER LOSSES; ELECTRIC CABLES; TRANSFORMERS; RELAYS; CAPACITORS
OSTI ID:
394380
Research Organizations:
Technical Research Centre of Finland, Espoo (Finland)
Country of Origin:
Finland
Language:
English
Other Identifying Numbers:
Other: ON: DE97711408; ISBN 951-38-4877-9; TRN: FI9603776
Availability:
OSTI as DE97711408
Submitting Site:
FI
Size:
26 p.
Announcement Date:

Citation Formats

Lehtonen, M. Harmonics in power systems of ships with electrical propulsion drives. Effects on the equipment. Finland: N. p., 1996. Web.
Lehtonen, M. Harmonics in power systems of ships with electrical propulsion drives. Effects on the equipment. Finland.
Lehtonen, M. 1996. "Harmonics in power systems of ships with electrical propulsion drives. Effects on the equipment." Finland.
@misc{etde_394380,
title = {Harmonics in power systems of ships with electrical propulsion drives. Effects on the equipment}
author = {Lehtonen, M}
abstractNote = {In this report the effect of harmonics on the power system equipment and loads, with special attention given to the circumstances in ships, is discussed. Some guidelines are given for the computation of additional harmonic losses in power cables and transformers. It is also shown, that if the system is rich in harmonics, these losses must be taken into account when sizing the equipment. The effect of harmonics on electrical machines is also discussed. The influence on induction machines is usually small. However, in large synchronous machines a significant degree of harmonic losses may be expected. Especially in the high voltage system the harmonics must be taken into account when selecting the machine ratings. Also the harmonic resonances, which may arise when using reactive power compensation capacitors, are discussed. Due to the risk of harmonic resonances, the use of capacitors is not recommended in marine power systems. Also the immunity of different load devices to harmonic distortion is discussed. The equipment considered are resistive loads, discharge lamps, universal machines and electronic equipment. Finally a brief survey is given on the standards and recommendations for the maximum distortion levels allowed. (author)}
place = {Finland}
year = {1996}
month = {Nov}
}