Title :
Multilevel power conditioner for grid-connected photovoltaic applications
Author :
Grandi, G. ; Ostojic, D. ; Rossi, C. ; Casadei, D.
Author_Institution :
Dept. of Electical Eng., Univ. of Bologna, Bologna
Abstract :
A novel scheme for three-phase grid-connected photovoltaic (PV) generation systems is presented in this paper. The proposed scheme is based on two insulated strings of PV panels, each one feeding a standard two-level three-phase voltage source inverter (VSI). Inverters are connected to grid by a three-phase transformer with the open winding configuration on inverters side. The resulting conversion structure performs as a multilevel power active filter, doubling the power capability of a single VSI with given current rating. An original control method has been introduced to regulate the dc-link voltages of each VSI. The proposed algorithm has been verified by numerical simulations with reference to different operating conditions. The results confirm the effectiveness of the whole conversion structure.
Keywords :
active filters; invertors; photovoltaic power systems; power filters; power generation control; power grids; power transformers; multilevel power active filter; open winding configuration; three- phase transformer; three-phase grid-connected photovoltaic generation systems; two-level three-phase voltage source inverter; Active filters; Costs; Inverters; Low voltage; Numerical simulation; Photovoltaic systems; Power transformer insulation; Solar power generation; Topology; Voltage control;
Conference_Titel :
Electrotechnical Conference, 2008. MELECON 2008. The 14th IEEE Mediterranean
Conference_Location :
Ajaccio
Print_ISBN :
978-1-4244-1632-5
Electronic_ISBN :
978-1-4244-1633-2
DOI :
10.1109/MELCON.2008.4618496
