Dissertação
Sistema fotovoltaico autônomo utilizando configuração multi-string e inversor multinível
Fecha
2011-08-11Registro en:
DESCONZI, Matheus Iensen. Stand-alone photovoltaic system using multi-string
configuration and multilevel inverter. 2011. 103 f. Dissertação (Mestrado em Engenharia Elétrica) - Universidade Federal de Santa Maria, Santa Maria, 2011.
Autor
Desconzi, Matheus Iensen
Institución
Resumen
The continuous economic development of many countries and the emerging environmental
issues (gas emissions and the greenhouse effect) observed in the last decades forced an intense
research in renewable energy sources. Hydro, photovoltaic (PV) and wind energy conversion are the
most explored technologies due to their considerable advantages, such as reliability, low
environmental impact and capability to support microgrid systems or to connect to the electric grid.
Among these energy sources the PV is pointed out as one of the most modular and environmentally
friendly technologies. Furthermore, this technology enabled, by means of stand-alone or off-grid
systems, the access of electricity in many communities distant form the grid, and even in difficult
access remote applications. However, the PV panel still represents low efficiency and high cost,
making imperative the use of efficient and reliable energy processing stages. Therefore, this work
proposes a stand-alone photovoltaic system with decentralized configuration, aiming a high energy
yield. For the output stage, a multilevel inverter was chosen, aggregating the intrinsic advantages that
these converters present. The analysis of each energy processing stage is presented, as well as the
modeling and control of the employed converters. Due to the requirement of a backup system (in
stand-alone systems), a decentralized configuration of the battery bank is proposed. Moreover, aiming
to optimize the backup system lifetime and reduce the maintenance costs, a controlled
charge/discharge process on the batteries is implemented. Simulation and experimental results are
presented, verifying the functionality of the proposed structure.