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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Differential protection for stator ground faults in a full-converter wind turbine generator

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Author(s):
Bataglioli, Rodrigo P. [1] ; Monaro, Renato M. [2] ; Coury, Denis V. [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Sao Carlos Sch Engn, Sao Paulo, SP - Brazil
[2] Univ Sao Paulo, Polytech Sch, Sao Paulo, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Electric Power Systems Research; v. 169, p. 195-205, APR 2019.
Web of Science Citations: 1
Abstract

Consolidated schemes and philosophies have been developed for Wind Energy Conversion Systems (WECS) protection. Although various studies have addressed this topic, including the internal protection function, there is still room for improvement, for instance, concerning the use of differential logic under varying frequencies. An aggravating factor related to protection issues is the high penetration of electronic devices in recent topologies, which may result in different responses in the case of internal faults, depending on the control strategy. In this scenario, conventional protection may not work properly. Based on this and considering the increasing tendency towards using full-converter WECS, there is a need to standardize them as well as improve their protection schemes. Thus, this paper analyses the application of the differential function in order to detect internal faults in a full-converter wind turbine generator. A differential protection scheme based on Discrete Fourier Transform (DFT) using dynamic window was discussed in this paper. The main objective was to reduce the phasor estimation error caused by the stator frequency variation. A complete protection scheme was implemented and tested using fault simulations from a Real Time Digital Simulator (RTDS). Very promising results were obtained. Furthermore, it was demonstrated throughout the paper that the grounding configuration greatly influences the protection performance of such equipment. (AU)

FAPESP's process: 17/09554-0 - Internal fault transients analysis and protection of wind generators
Grantee:Renato Machado Monaro
Support Opportunities: Regular Research Grants
FAPESP's process: 15/24028-7 - Real time simulation and protection of wind generators in the Smart Grids context
Grantee:Rodrigo Pavanello Bataglioli
Support Opportunities: Scholarships in Brazil - Master