Multilevel Diode-Clamped Converter for Photovoltaic Generators With Independent Voltage Control of Each Solar Array
Busquets-Monge, S.
Rocabert, J.
Rodriguez, P.
Alepuz, S.
Bordonau, J.
Dept. of Electron. Eng., Tech. Univ. of Catalonia, Barcelona;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: July 2008
Volume: 55,
Issue: 7
On page(s): 2713-2723
ISSN: 0278-0046
INSPEC Accession Number: 10074557
Digital Object Identifier: 10.1109/TIE.2008.924011
Current Version Published: 2008-06-24
Abstract
In photovoltaic (PV) power systems where a set of series-connected PV arrays (PVAs) is connected to a conventional two-level inverter, the occurrence of partial shades and/or the mismatching of PVAs leads to a reduction of the power generated from its potential maximum. To overcome these problems, the connection of the PVAs to a multilevel diode-clamped converter is considered in this paper. A control and pulsewidth-modulation scheme is proposed, capable of independently controlling the operating voltage of each PVA. Compared to a conventional two-level inverter system, the proposed system configuration allows one to extract maximum power, to reduce the devices voltage rating (with the subsequent benefits in device-performance characteristics), to reduce the output-voltage distortion, and to increase the system efficiency. Simulation and experimental tests have been conducted with three PVAs connected to a four-level three-phase diode-clamped converter to verify the good performance of the proposed system configuration and control strategy.
Index
Terms
Available to subscribers and IEEE members.
References
Available to subscribers and IEEE members.
Citing Documents
Available to subscribers and IEEE members.
Cart
