Dual-inverter-based MPPT algorithm for grid-connected photovoltaic systems

Author

Grandi, G. ; Ostojic, D.

Author_Institution

Dept. of Electr. Eng., Univ. of Bologna, Bologna, Italy

fYear

2009

fDate

9-11 June 2009

Firstpage

393

Lastpage

398

Abstract

A novel MPPT algorithm for three-phase grid-connected photovoltaic generation systems is presented in this paper. Reference is made to a conversion scheme consisting in two balanced arrays of PV modules, each one feeding a standard two-level three-phase voltage source inverter (VSI). The dc-link voltages of each VSI are regulated according with the requirement of the proposed MPPT algorithm, based on the comparison of the operating points of the two PV arrays. Inverters are connected to grid by a three-phase transformer with open-ends winding configuration on inverters side. The resulting conversion structure performs as a power active filter, doubling the power capability of a single VSI, with the additional benefit of voltage multilevel waveforms. The proposed MPPT algorithm has been successfully verified by numerical simulation and experimental tests.

Keywords

invertors; numerical analysis; photovoltaic power systems; power transformers; dc-link voltages; dual-inverter-based MPPT algorithm; numerical simulation; open-ends winding; standard two-level three-phase voltage source inverter; three-phase grid-connected photovoltaic generation systems; three-phase transformer; Choppers; Costs; Inductance; Inverters; Mesh generation; Phase transformers; Photovoltaic systems; Power transformer insulation; Topology; Voltage control; MPPT algorithm; PV generation; grid connected system; multilevel inverter;

fLanguage

English

Publisher

ieee

Conference_Titel

Clean Electrical Power, 2009 International Conference on

Conference_Location

Capri

Print_ISBN

978-1-4244-2543-3

Electronic_ISBN

978-1-4244-2544-0

Type

conf

DOI

10.1109/ICCEP.2009.5212023

Filename

5212023