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 language | English |
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Pages (from-to) | 2164 -2173 |
Number of pages | 10 |
Journal | IEEE Transactions on Power Delivery |
Volume | 25 |
Issue number | 4 |
DOIs | |
Publication status | Published - Oct 2010 |
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Dive into the research topics of 'Analysis and design of an offshore wind farm using a MV DC grid'. Together they form a unique fingerprint.Impacts
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Development of DC transmission grids using DC-DC converters
Dragan Jovcic (Coordinator)
Impact: Other Impacts
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MW size DC/DC converters and DC circuit breakers
Dragan Jovcic (Coordinator) & B.T. Ooi (Coordinator)
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