Analysis and design of an offshore wind farm using a MV DC grid

Jonathan Robinson, Dragan Jovcic, Geza Joos

Research output: Contribution to journalArticle

161 Citations (Scopus)

Abstract

This paper outlines the design of an offshore wind farm using a dc offshore grid based on resonant dc-dc converters. Multiphase resonant dc-dc converters are studied to step up the dc voltage from individual wind generators to a Medium Voltage (MV) dc bus, and from the MV bus to an HVDC line that will connect the wind farm to shore. Compared to an equivalent ac grid-based wind farm, a dc grid-based wind farm has slightly higher losses, but the weight of the magnetic components and cables is substantially lower. The analysis of operating permanent-magnet synchronous generators at variable and constant dc voltages shows that a fixed dc voltage has marginally higher efficiency than a variable dc voltage. However, using a variable dc voltage gives lower harmonics at the generator facing the voltage-source converter and the dc-dc step-up converter. An aggregated model of multiple parallel connected wind generators is developed and shown to accurately approximate a detailed PSCAD model during varying wind conditions and transients.
Original languageEnglish
Pages (from-to)2164 -2173
Number of pages10
JournalIEEE Transactions on Power Delivery
Volume25
Issue number4
DOIs
Publication statusPublished - Oct 2010

Fingerprint

Offshore wind farms
Electric potential
Synchronous generators
Permanent magnets
Cables

Cite this

Analysis and design of an offshore wind farm using a MV DC grid. / Robinson, Jonathan; Jovcic, Dragan; Joos, Geza.

In: IEEE Transactions on Power Delivery, Vol. 25, No. 4, 10.2010, p. 2164 -2173.

Research output: Contribution to journalArticle

Robinson, Jonathan ; Jovcic, Dragan ; Joos, Geza. / Analysis and design of an offshore wind farm using a MV DC grid. In: IEEE Transactions on Power Delivery. 2010 ; Vol. 25, No. 4. pp. 2164 -2173.
@article{b3a7068c79284314a169f0d83d2a13e5,
title = "Analysis and design of an offshore wind farm using a MV DC grid",
abstract = "This paper outlines the design of an offshore wind farm using a dc offshore grid based on resonant dc-dc converters. Multiphase resonant dc-dc converters are studied to step up the dc voltage from individual wind generators to a Medium Voltage (MV) dc bus, and from the MV bus to an HVDC line that will connect the wind farm to shore. Compared to an equivalent ac grid-based wind farm, a dc grid-based wind farm has slightly higher losses, but the weight of the magnetic components and cables is substantially lower. The analysis of operating permanent-magnet synchronous generators at variable and constant dc voltages shows that a fixed dc voltage has marginally higher efficiency than a variable dc voltage. However, using a variable dc voltage gives lower harmonics at the generator facing the voltage-source converter and the dc-dc step-up converter. An aggregated model of multiple parallel connected wind generators is developed and shown to accurately approximate a detailed PSCAD model during varying wind conditions and transients.",
author = "Jonathan Robinson and Dragan Jovcic and Geza Joos",
year = "2010",
month = "10",
doi = "10.1109/TPWRD.2010.2053390",
language = "English",
volume = "25",
pages = "2164 --2173",
journal = "IEEE Transactions on Power Delivery",
issn = "0885-8977",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "4",

}

TY - JOUR

T1 - Analysis and design of an offshore wind farm using a MV DC grid

AU - Robinson, Jonathan

AU - Jovcic, Dragan

AU - Joos, Geza

PY - 2010/10

Y1 - 2010/10

N2 - This paper outlines the design of an offshore wind farm using a dc offshore grid based on resonant dc-dc converters. Multiphase resonant dc-dc converters are studied to step up the dc voltage from individual wind generators to a Medium Voltage (MV) dc bus, and from the MV bus to an HVDC line that will connect the wind farm to shore. Compared to an equivalent ac grid-based wind farm, a dc grid-based wind farm has slightly higher losses, but the weight of the magnetic components and cables is substantially lower. The analysis of operating permanent-magnet synchronous generators at variable and constant dc voltages shows that a fixed dc voltage has marginally higher efficiency than a variable dc voltage. However, using a variable dc voltage gives lower harmonics at the generator facing the voltage-source converter and the dc-dc step-up converter. An aggregated model of multiple parallel connected wind generators is developed and shown to accurately approximate a detailed PSCAD model during varying wind conditions and transients.

AB - This paper outlines the design of an offshore wind farm using a dc offshore grid based on resonant dc-dc converters. Multiphase resonant dc-dc converters are studied to step up the dc voltage from individual wind generators to a Medium Voltage (MV) dc bus, and from the MV bus to an HVDC line that will connect the wind farm to shore. Compared to an equivalent ac grid-based wind farm, a dc grid-based wind farm has slightly higher losses, but the weight of the magnetic components and cables is substantially lower. The analysis of operating permanent-magnet synchronous generators at variable and constant dc voltages shows that a fixed dc voltage has marginally higher efficiency than a variable dc voltage. However, using a variable dc voltage gives lower harmonics at the generator facing the voltage-source converter and the dc-dc step-up converter. An aggregated model of multiple parallel connected wind generators is developed and shown to accurately approximate a detailed PSCAD model during varying wind conditions and transients.

U2 - 10.1109/TPWRD.2010.2053390

DO - 10.1109/TPWRD.2010.2053390

M3 - Article

VL - 25

SP - 2164

EP - 2173

JO - IEEE Transactions on Power Delivery

JF - IEEE Transactions on Power Delivery

SN - 0885-8977

IS - 4

ER -