Documents disponibles écrits par cet auteur

An analytical approach to determine the optimal resistance for the three-series-resistor method for induction generator connection / Grilo, A. P. in IEEE transactions on energy conversion, Vol. 23 n°4 (Décembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1111 - 1113 Titre : An analytical approach to determine the optimal resistance for the three-series-resistor method for induction generator connection Type de document : texte imprimé Auteurs : Grilo, A. P., Auteur ; Sharghi, A., Auteur ; Freitas, W., Auteur Année de publication : 2009 Article en page(s) : pp. 1111 - 1113 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous  generators;  resistors Résumé : This letter presents a set of analytical formulas to determine the optimal resistor size to be used in the three-series-resistor method of squirrel-cage induction generators connection. The analytical formulation is based on the short-circuit theory of induction machines. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675806&sortType%3Das [...] [article] An analytical approach to determine the optimal resistance for the three-series-resistor method for induction generator connection [texte imprimé] / Grilo, A. P., Auteur ; Sharghi, A., Auteur ; Freitas, W., Auteur . - 2009 . - pp. 1111 - 1113. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1111 - 1113 Mots-clés : Asynchronous  generators;  resistors Résumé : This letter presents a set of analytical formulas to determine the optimal resistor size to be used in the three-series-resistor method of squirrel-cage induction generators connection. The analytical formulation is based on the short-circuit theory of induction machines. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675806&sortType%3Das [...]

Impact of positive-feedback anti-islanding methods on small-signal stability of inverter-based distributed generation / Xiaoyu, Wang in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 923 - 931 Titre : Impact of positive-feedback anti-islanding methods on small-signal stability of inverter-based distributed generation Type de document : texte imprimé Auteurs : Xiaoyu, Wang, Auteur ; Freitas, W., Auteur Année de publication : 2008 Article en page(s) : pp. 923 - 931 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Distributed  power  generation;  feedback;  invertors;  power  grids;  power  system  stability Résumé : This paper investigates the impact of positive-feedback anti-islanding methods on the small-signal stability of grid-connected inverter-based distributed generation. The maximum power transfer capability of a distributed generator (DG) is analyzed. Sensitivity studies are conducted for DGs equipped with the Sandia frequency shift anti-islanding scheme. Factors such as positive-feedback gain, initial chopping fraction, local load level, and network line impedance are investigated. The maximum power transfer limit versus positive-feedback gain curve is proposed as an index for the stability analysis. The results show that the positive-feedback anti-islanding scheme does have the potential to destabilize the grid-connected DG system when the grid is weak or the DG size is large. A curve that relates the maximum stable DG power transfer level versus the islanding detection time is proposed to quantify the destabilizing effect of the positive-feedback-based anti-islanding schemes. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4567146&sortType%3Das [...] [article] Impact of positive-feedback anti-islanding methods on small-signal stability of inverter-based distributed generation [texte imprimé] / Xiaoyu, Wang, Auteur ; Freitas, W., Auteur . - 2008 . - pp. 923 - 931. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 923 - 931 Mots-clés : Distributed  power  generation;  feedback;  invertors;  power  grids;  power  system  stability Résumé : This paper investigates the impact of positive-feedback anti-islanding methods on the small-signal stability of grid-connected inverter-based distributed generation. The maximum power transfer capability of a distributed generator (DG) is analyzed. Sensitivity studies are conducted for DGs equipped with the Sandia frequency shift anti-islanding scheme. Factors such as positive-feedback gain, initial chopping fraction, local load level, and network line impedance are investigated. The maximum power transfer limit versus positive-feedback gain curve is proposed as an index for the stability analysis. The results show that the positive-feedback anti-islanding scheme does have the potential to destabilize the grid-connected DG system when the grid is weak or the DG size is large. A curve that relates the maximum stable DG power transfer level versus the islanding detection time is proposed to quantify the destabilizing effect of the positive-feedback-based anti-islanding schemes. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4567146&sortType%3Das [...]