Estudos, parametrização e ensaios da proteção do ponto de conexão de uma microrrede ao sistema de distribuição de baixa tensão.

Abstract

The purpose of this work is to accomplish the protection studies of a microgrid connected at point of common coupling at the low-side voltage of the distribution system. The motivation came from the project of the Microgrid Laboratory of the Electrical Engineering Department at the Universidade Federal do Ceará Campus do Pici, where the microgrid under study will be assembled. The protections settings were parameterized in a commercial protection relay. Performance testings of the protections functions were carried out through a test equipment of the Energy Systems Laboratory of the Universidade Federal do Ceará Campus Sobral. To achieve the objectives, a study about microgrid´s technologies and national and international standards were performed aiming to know the minimum requirements to protection of a microgrid point of common coupling. Additionaly, it was also necessary a study about the operation of the utilized devices, the protection relay and the test equipment. The various conditions of operation of the topology of the microgrid, which change according to the number of energy resources in operation, were taken account. The settings were calculated according to the analysis of topology and to the consulted standards. This work proposed the utilization of the setting group change of the protection relay aiming to improve the overcurrent neutral function sensibility. The work was accomplished with the practical implementation of the performance test and analysis of the results.