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Passive Filter Design and Offshore Wind Turbine Modelling for System Level Harmonic Studies

Brantsæter, Henrik; Kocewiak, Łukasz; Tedeschi, Elisabetta; Årdal, Atle Rygg
Peer reviewed, Journal article
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URI
http://hdl.handle.net/11250/2381992
Date
2015
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  • Institutt for elkraftteknikk [1556]
  • Publikasjoner fra CRIStin - NTNU [19736]
Original version
Energy Procedia 2015:401-410   10.1016/j.egypro.2015.11.444
Abstract
This paper is aimed at creating a framework for harmonic studies of an offshore wind power plant by means of system level time

domain simulations. Many modern wind turbine generators employ full-scale power electronic converters, thus the filter connected

between the power electronic converter and grid becomes a key aspect. The main contribution of the paper is a comparison between

eight LCL-filter configurations. The 400 MW Anholt offshore wind power plant offthe coast of Denmark, and its 3.6 MW turbines,

is considered a reference for this paper.

LCL filters find broad application in the grid integration of power electronic converters. Common practices for the tuning of

such filters are therefore examined and adapted to the requirements of a specific test case. Hence, a set of parameters is defined

for the LCL filter of a grid connected 3.6 MW wind turbine with a full-scale power electronic converter. LCL filters are further

examined through analysis in the frequency domain, focusing on passive damping methods and variations of the capacitive branch

which may improve the characteristics of such filters. Finally, a time-domain model of a grid-connected wind turbine inverter is

established. Eight different LCL-filter configurations are implemented and compared in terms of harmonic content and losses. It

is shown how dedicated additional branches are able to reduce both losses and harmonic content. This analysis is carried out using

open-loop converter control system. A simple model including the full control system is constructed and outlined in a separate

section.
Publisher
Elsevier
Journal
Energy Procedia

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