Diseño de un sistema de protecciones eléctricas basado en contactores como método de protecciones ante fallas en sistemas de distribución nodales DC

Abstract

The present paper proposes to employ arc contactors as alternative to protect nodal micro-grids (MR). The authors made a review of the importance of this type of network. It is also reviewed the parts and types of micro-grids. The previous researches on micro-grid protection are also boarded. The main technical challenges to protect important components of a microgrids are also mentioned. The most challenging aspects of DC grid protection are considered. A review of the protection of devices that have a fault current value constraint due to electronic devices that allow the energy conversion. Next, the design of protection with contactors and the control structure based in some previous researches are tested. This is a valuable idea due to the low cost compared with other alternatives. These tests are accomplished through simulation techniques of a micro-grid based on IEEE14 test grid. The structure includes solar power, converters and storage media connected to the grid that is hybrid. In the afore-mentioned parts failure tests are performed. The tests allow to analyze the protection scheme behavior. The focus of the analysis is the waveform of fault current on the nodes of the network and the clearance time of each proposed fault.