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Walmir Freitas
Walmir Freitas
Professor of Electrical Engineering, University of Campinas
E-mail confirmado em unicamp.br - Página inicial
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Comparative analysis between ROCOF and vector surge relays for distributed generation applications
W Freitas, W Xu, CM Affonso, Z Huang
IEEE Transactions on power delivery 20 (2), 1315-1324, 2005
4722005
Three-phase doubly fed induction generators: an overview
M Tazil, V Kumar, RC Bansal, S Kong, ZY Dong, W Freitas, HD Mathur
IET Electric Power Applications 4 (2), 75-89, 2010
3052010
Comparative analysis between synchronous and induction machines for distributed generation applications
W Freitas, JCM Vieira, A Morelato, LCP Da Silva, VF Da Costa, ...
IEEE transactions on Power Systems 21 (1), 301-311, 2006
2372006
A comprehensive assessment of PV hosting capacity on low-voltage distribution systems
R Torquato, D Salles, CO Pereira, PCM Meira, W Freitas
IEEE Transactions on Power Delivery 33 (2), 1002-1012, 2018
2332018
An investigation on the selection of filter topologies for passive filter applications
AB Nassif, W Xu, W Freitas
IEEE transactions on Power Delivery 24 (3), 1710-1718, 2009
2162009
Method for determining the maximum allowable penetration level of distributed generation without steady-state voltage violations
HM Ayres, W Freitas, MC De Almeida, LCP Da Silva
IET generation, transmission & distribution 4 (4), 495-508, 2010
2152010
A practical method for assessing the effectiveness of vector surge relays for distributed generation applications
W Freitas, Z Huang, W Xu
IEEE Transactions on Power Delivery 20 (1), 57-63, 2005
2142005
Fault location in distribution systems based on smart feeder meters
FCL Trindade, W Freitas, JCM Vieira
IEEE transactions on Power Delivery 29 (1), 251-260, 2013
1992013
Performance of frequency relays for distributed generation protection
JCM Vieira, W Freitas, W Xu, A Morelato
IEEE transactions on power delivery 21 (3), 1120-1127, 2006
1912006
Efficient coordination of ROCOF and frequency relays for distributed generation protection by using the application region
JCM Vieira, W Freitas, W Xu, A Morelato
IEEE transactions on power delivery 21 (4), 1878-1884, 2006
1882006
Impacts of AC generators and DSTATCOM devices on the dynamic performance of distribution systems
W Freitas, A Morelato, W Xu, F Sato
IEEE transactions on power delivery 20 (2), 1493-1501, 2005
1852005
An event window based load monitoring technique for smart meters
M Dong, PCM Meira, W Xu, W Freitas
IEEE transactions on smart grid 3 (2), 787-796, 2012
1762012
Assessing the collective harmonic impact of modern residential loads—Part I: Methodology
D Salles, C Jiang, W Xu, W Freitas, HE Mazin
IEEE transactions on power delivery 27 (4), 1937-1946, 2012
1642012
A Monte Carlo simulation platform for studying low voltage residential networks
R Torquato, Q Shi, W Xu, W Freitas
IEEE Transactions on Smart Grid 5 (6), 2766-2776, 2014
1382014
Performance of ROCOF relays for embedded generation applications
CM Affonso, W Freitas, W Xu, LCP Da Silva
IEE Proceedings-Generation, Transmission and Distribution 152 (1), 109-114, 2005
1352005
Low voltage zones to support fault location in distribution systems with smart meters
FCL Trindade, W Freitas
IEEE Transactions on Smart Grid 8 (6), 2765-2774, 2016
1222016
Influence of excitation system control modes on the allowable penetration level of distributed synchronous generators
W Freitas, JCM Vieira, A Morelato, W Xu
IEEE Transactions on Energy Conversion 20 (2), 474-480, 2005
1192005
An investigation on the nondetection zones of synchronous distributed generation anti-islanding protection
JCM Vieira, W Freitas, W Xu, A Morelato
IEEE transactions on power delivery 23 (2), 593-600, 2008
1182008
Formulas for predicting the dynamic performance of ROCOF relays for embedded generation applications
JCM Vieira, W Freitas, Z Huang, W Xu, A Morelato
IEE Proceedings-Generation, Transmission and Distribution 153 (4), 399-406, 2006
1172006
Utility harmonic impedance measurement based on data selection
J Hui, W Freitas, JCM Vieira, H Yang, Y Liu
IEEE Transactions on Power Delivery 27 (4), 2193-2202, 2012
1092012
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