Title :
Experimental tests on a multilevel converter for grid-connected photovoltaic systems
Author :
Grandi, G. ; Ostojic, D. ; Rossi, C.
Author_Institution :
Dept. of Electr. Eng., Univ. of Bologna, Bologna
Abstract :
A complete set of experimental tests on a novel conversion 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). The inverters are connected to grid by a three-phase transformer with the open winding configuration on inverters side. The resulting conversion structure acts as a multilevel converter, 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, allowing the whole converter to inject the PV energy into the grid and to perform as a power active filter.
Keywords :
active filters; invertors; photovoltaic power systems; power convertors; power filters; power grids; power transformers; PV panel insulated strings; dc-link voltages; multilevel converter; power active filter; three-phase grid-connected photovoltaic generation systems; three-phase transformer; three-phase voltage source inverter; Active filters; Costs; DC-DC power converters; Inverters; Phase transformers; Photovoltaic systems; Power transformer insulation; System testing; Topology; Voltage control;
Conference_Titel :
Control and Modeling for Power Electronics, 2008. COMPEL 2008. 11th Workshop on
Conference_Location :
Zurich
Print_ISBN :
978-1-4244-2550-1
Electronic_ISBN :
978-1-4244-2551-8
DOI :
10.1109/COMPEL.2008.4634698
