Documents disponibles écrits par cet auteur

Estimation of hydropower generator parameters through field simulations of standard tests / Lidenholm, J. in IEEE transactions on energy conversion, Vol. 25, N° 4 (Décembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 931 - 939 Titre : Estimation of hydropower generator parameters through field simulations of standard tests Type de document : texte imprimé Auteurs : Lidenholm, J., Auteur ; Lundin, U., Auteur Année de publication : 2011 Article en page(s) : pp. 931 - 939 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Finite  element  analysis;  hydroelectric  power  stations;  synchronous  generators Résumé : Four standard test procedures-the three phase short-circuit test , the field decrement test, the slip test, and the applied voltage test-for estimation of synchronous generator parameters have been implemented in a time-stepping finite-element software. In this paper, the main features of the implementation and the postprocessing of data are described. The validity of the application is demonstrated by comparison with test results from the commissioning of a large hydropower generator. The method is shown to be effective in estimating most parameters. Better representation of the exciter and the interpole connections of the damper circuit is believed to enhance the compliance even further. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5623337&sortType%3Das [...] [article] Estimation of hydropower generator parameters through field simulations of standard tests [texte imprimé] / Lidenholm, J., Auteur ; Lundin, U., Auteur . - 2011 . - pp. 931 - 939. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 931 - 939 Mots-clés : Finite  element  analysis;  hydroelectric  power  stations;  synchronous  generators Résumé : Four standard test procedures-the three phase short-circuit test , the field decrement test, the slip test, and the applied voltage test-for estimation of synchronous generator parameters have been implemented in a time-stepping finite-element software. In this paper, the main features of the implementation and the postprocessing of data are described. The validity of the application is demonstrated by comparison with test results from the commissioning of a large hydropower generator. The method is shown to be effective in estimating most parameters. Better representation of the exciter and the interpole connections of the damper circuit is believed to enhance the compliance even further. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5623337&sortType%3Das [...]

On permeance modeling of large hydrogenerators with application to voltage harmonics prediction / Ranlöf, M. in IEEE transactions on energy conversion, Vol. 25, N° 4 (Décembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1179 - 1186 Titre : On permeance modeling of large hydrogenerators with application to voltage harmonics prediction Type de document : texte imprimé Auteurs : Ranlöf, M., Auteur ; Perers, R., Auteur ; Lundin, U., Auteur Année de publication : 2011 Article en page(s) : pp. 1179 - 1186 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Harmonics;  hydroelectric  generators;  losses Résumé : In this paper, a permeance model that can be employed to estimate the no-load damper current loss and voltage waveform harmonics in large hydrogenerators is presented. The importance of modeling the damper magnetomotive force and inductances correctly is emphasized, and detailed descriptions are presented. The computed harmonics are compared with values obtained from time-stepped finite-element calculations and measured data. The results are in good agreement. The influence of pole-to-pole damper bar connections, and of the number of damper bars on the voltage waveform, is explained. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5445012&sortType%3Das [...] [article] On permeance modeling of large hydrogenerators with application to voltage harmonics prediction [texte imprimé] / Ranlöf, M., Auteur ; Perers, R., Auteur ; Lundin, U., Auteur . - 2011 . - pp. 1179 - 1186. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1179 - 1186 Mots-clés : Harmonics;  hydroelectric  generators;  losses Résumé : In this paper, a permeance model that can be employed to estimate the no-load damper current loss and voltage waveform harmonics in large hydrogenerators is presented. The importance of modeling the damper magnetomotive force and inductances correctly is emphasized, and detailed descriptions are presented. The computed harmonics are compared with values obtained from time-stepped finite-element calculations and measured data. The results are in good agreement. The influence of pole-to-pole damper bar connections, and of the number of damper bars on the voltage waveform, is explained. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5445012&sortType%3Das [...]