Flexibilização da microrrede Pici-UFC para operação como sistema híbrido isolado

Abstract

The microgrids can be designed to work connected to or totally isolated from the distribution networkin order to provide electricity to communities not supplied by the distribution network. The microgrid installed in the Intelligent Electrical Networks laboratory, in the Department of Electrical Engineering, of the Technology Center of the Federal University of Ceará (UFC) is made up of three single-phase photovoltaic sources, a bank of batteries, and in development an emulated three-phase wind turbine system. The microgrid Pici-UFC aims to provide a flexible environment for research and development. The battery bank inverter (network former) is bidirectional and has the function of enabling the operation of the microgrid in backup mode to meet priority loads. The battery inverter enables also to support offgrid systems, supplied by photovoltaic systems, small hydroelectric power plants, wind turbine systems, microturbines, etc. The purpose of this work is the addition of a function that will provide fully isolated operation of the Pici-UFC microgrid from the distribution network, using the battery inverter in order to make this research environment even more flexible. The offgrid microgrid is designed to operate with a photovoltaic system, a fuel-based generator and a battery bank of 41.47 hours of autonomy. A local command and control was designed for operation of the microgrid in isolated mode, as well as mapping the points for remote supervision and control made available from digital inputs and outputs of a programmable controller of the microgrid.