Harmonics in power systems of ships with electrical propulsion drives. Part 1. Effects on the equipment

Matti Lehtonen

Research output: Book/ReportReportProfessional

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.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages25
ISBN (Print)951-38-4877-9
Publication statusPublished - 1996
MoE publication typeNot Eligible

Publication series

NameVTT Tiedotteita - Meddelanden - Research Notes
PublisherVTT
No.1722
ISSN (Print)1235-0605
ISSN (Electronic)1455-0865

Fingerprint

Propulsion
Ships
Capacitors
Discharge lamps
Harmonic distortion
Reactive power
Cables
Electronic equipment
Electric potential
Compensation and Redress

Keywords

  • power equipment
  • ships
  • propulsion
  • drives
  • electric drives
  • electric propulsion
  • equipment
  • marine propulsion
  • electric power generation

Cite this

Lehtonen, M. (1996). Harmonics in power systems of ships with electrical propulsion drives. Part 1. Effects on the equipment. Espoo: VTT Technical Research Centre of Finland. VTT Tiedotteita - Meddelanden - Research Notes, No. 1722
Lehtonen, Matti. / Harmonics in power systems of ships with electrical propulsion drives. Part 1. Effects on the equipment. Espoo : VTT Technical Research Centre of Finland, 1996. 25 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 1722).
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Lehtonen, M 1996, Harmonics in power systems of ships with electrical propulsion drives. Part 1. Effects on the equipment. VTT Tiedotteita - Meddelanden - Research Notes, no. 1722, VTT Technical Research Centre of Finland, Espoo.

Harmonics in power systems of ships with electrical propulsion drives. Part 1. Effects on the equipment. / Lehtonen, Matti.

Espoo : VTT Technical Research Centre of Finland, 1996. 25 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 1722).

Research output: Book/ReportReportProfessional

TY - BOOK

T1 - Harmonics in power systems of ships with electrical propulsion drives. Part 1. Effects on the equipment

AU - Lehtonen, Matti

PY - 1996

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N2 - 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.

AB - 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.

KW - power equipment

KW - ships

KW - propulsion

KW - drives

KW - electric drives

KW - electric propulsion

KW - equipment

KW - marine propulsion

KW - electric power generation

M3 - Report

SN - 951-38-4877-9

T3 - VTT Tiedotteita - Meddelanden - Research Notes

BT - Harmonics in power systems of ships with electrical propulsion drives. Part 1. Effects on the equipment

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Lehtonen M. Harmonics in power systems of ships with electrical propulsion drives. Part 1. Effects on the equipment. Espoo: VTT Technical Research Centre of Finland, 1996. 25 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 1722).