Evaluation by Simulation of Merit Figures for Different Grid Connected Photovoltaic Inverter Topologies

Abstract

Se pretende diseñar un inversor fotovoltáico de 5kW que permita extraer potencia de un conjunto de paneles fotovoltaicos e inyectarla a la red eléctrica con factor de potencia unitario. La curva característica (Ipv-Vpv) de estos paneles fotovoltaicos varía en función de la irradiancia y la temperatura a la que están sometidos. El inversor debe ser capaz de mantener la calidad de la corriente inyectada (?IL o THD) en todo el margen de funcionamiento. El diseño considerado debe minimizar el tamaño del filtro de salida (topología LCL) y maximizar la eficiencia global del inv

The present work explores the best way to extract the energy from solar panel arrays. These panel arrays will be divided differently leading to three inverter connection topologies. The inverters are connected to the grid through an LCL filter, so stability of the system is analysed for all the topologies. A new control for the parallel inverters connected topology based on phase control will be proposed. Finally, a comparative between the three topologies studied will be presented. Efficiency and heating will be studied in this comparative.