Estimation of wind parameter variation effect on the power quality of hybrid weak grids

Ladakakos, PD; Ioannides, MG

dc.contributor.author	Ladakakos, PD	en
dc.contributor.author	Ioannides, MG	en
dc.date.accessioned	2014-03-01T01:48:35Z
dc.date.available	2014-03-01T01:48:35Z
dc.date.issued	1999	en
dc.identifier.issn	0309524X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25520
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0033498830&partnerID=40&md5=fb153548a06eb6e3dbbff08c5b58e2b4	en
dc.subject.other	airflow	en
dc.subject.other	electric potential	en
dc.subject.other	electric power plant	en
dc.subject.other	turbulent flow	en
dc.subject.other	wind energy	en
dc.subject.other	wind turbine	en
dc.subject.other	Turbulence	en
dc.subject.other	Wind turbines	en
dc.subject.other	Wind energy converters (WEC)	en
dc.subject.other	Wind power	en
dc.subject.other	electricity generation	en
dc.subject.other	wind power	en
dc.subject.other	wind turbine	en
dc.title	Estimation of wind parameter variation effect on the power quality of hybrid weak grids	en
heal.type	journalArticle	en
heal.publicationDate	1999	en
heal.abstract	The generated voltage, frequency and current distortions due to the insertion of wind energy systems in autonomous weak grids is investigated. Laboratory measurements on a wind-diesel experimental system are presented for various operational cases with different characteristics of the wind speed and turbulence. In order to estimate the effect of the different parameters of a wind power plant on the power quality of an existing diesel powered system, a methodology was used to compare the system's behavior operating with and without wind turbines. The experimental results prove that the most serious disturbances in the system's operation occur as the wind turbine switches in and out of the grid. During the system's steady state operation, the wind speed's turbulence intensity becomes the most important parameter affecting mainly the frequency variations. Whereas the voltage variations are increased during the operation of the turbine, but are affected more from the level of the wind speed than the turbulence. Concerning flicker, the results show that short-term flicker depends mainly on the turbulence intensity. Only in cases with high turbulence is flicker above the values measured in diesel-only mode. The level of harmonics, in all cases, was measured much less than the limits imposed by relevant grid regulations, despite the generator of the Wind Energy Converter (WEC) being directly coupled to the grid.The generated voltage, frequency and current distortions due to the insertion of wind energy systems in autonomous weak grids is investigated. Laboratory measurements on a wind-diesel experimental system are presented for various operational cases with different characteristics of the wind speed and turbulence. In order to estimate the effect of the different parameters of a wind power plant on the power quality of an existing diesel powered system, a methodology was used to compare the system's behavior operating with and without wind turbines. The experimental results prove that the most serious disturbances in the system's operation occur as the wind turbine switches in and out of the grid. During the system's steady state operation, the wind speed's turbulence intensity becomes the most important parameter affecting mainly the frequency variations. Whereas the voltage variations are increased during the operation of the turbine, but are affected more from the level of the wind speed than the turbulence. Concerning flicker, the results show that short-term flicker depends mainly on the turbulence intensity. Only in cases with high turbulence is flicker above the values measured in diesel-only mode. The level of harmonics, in all cases, was measured much less than the limits imposed by relevant grid regulations, despite the generator of the Wind Energy Converter (WEC) being directly coupled to the grid.	en
heal.publisher	Multi-Science Publishing Co, Ltd, Brentwood, United Kingdom	en
heal.journalName	Wind Engineering	en
dc.identifier.volume	23	en
dc.identifier.issue	6	en
dc.identifier.spage	353	en
dc.identifier.epage	364	en