eng URI http://hdl.handle.net/10795/3723 ανανεώσιμη ενέργεια ηλεκτρική ενέργεια ενεργειακοί πόροι ενεργειακό δίκτυο αποθήκευση ενέργειας The power quality problems are generated by the deviation from the standard values of the amplitude and frequency of the supplied voltages and currents. The causes of these variations are different and can be generated by the utility or by the end users. In the present paper we deal with the generation current and voltage harmonics by the nonlinear loads and their cancellation techniques. There are several methods for harmonic cancellation, the last and most efficient one being by direct injection of currents and/or voltages by the means of power electronic converters operating as current or voltage sources. A number of advanced solutions are presented in the present paper capable to minimize the overall harmonic distortion level. A special attention was given to weak systems harmonic cancellation for which the harmonic power flow direction has to be taken into account, as well as the use of multifrequency references and the prediction techniques for nonsinusoidal load currents. 24 pp. LOMv1.0 creator LOMv1.0 Project Executing Organisation 2012-07 Digital Library of the Operational Programme "Education and Lifelong Learning" abstract types Text AC distribution grids Power quality 2428417 application/pdf http://repository.edulll.gr/edulll/bitstream/10795/3723/4/3723_01_IntegrationofRESinACGrids-RMagureanu_v2012.pdf 918520 application/pdf http://repository.edulll.gr/edulll/bitstream/10795/3723/5/3723_02_PowerQualityInACGrids-RMagureanu_v2012.pdf 9952772 application/pdf http://repository.edulll.gr/edulll/bitstream/10795/3723/6/3723_03_IntegrationofRESinACGrids-RMagureanu_v2012.pdf Άρθρο και παρουσίαση για τη διεθνή εκδήλωση "The Innovation Week on R.E.S.: 11 Days Intensive Learning & Exhibition of Innovation on PV Systems Engineering & the other Renewable Energy Systems and the Entrepreneurship spirit", που διοργανώθηκε από το ΤΕΙ Πάτρας και τα συνεργαζόμενα πανεπιστήμια, στην Πάτρα, στις 1-11 Ιουλίου 2012. URI http://hdl.handle.net/10795/3723 LOMv1.0creator 2016-06-22T12:21:53Z LOMv1.0validator 2016-06-22T12:21:53Z LOMv1.0 gre no no Copyright EYD-EPEDBM (Operational Programme "Education and Lifelong Learning")