DocumentCode :
1141893
Title :
Multilevel Diode-Clamped Converter for Photovoltaic Generators With Independent Voltage Control of Each Solar Array
Author :
Busquets-Monge, Sergio ; Rocabert, Joan ; Rodríguez, Pedro ; Alepuz, Salvador ; Bordonau, Josep
Author_Institution :
Dept. of Electron. Eng., Tech. Univ. of Catalonia, Barcelona
Volume :
55
Issue :
7
fYear :
2008
fDate :
7/1/2008 12:00:00 AM
Firstpage :
2713
Lastpage :
2723
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.
Keywords :
electric generators; invertors; photovoltaic power systems; power convertors; power generation control; pulse width modulation; voltage control; four-level three-phase diode-clamped converter; independent voltage control; multilevel diode-clamped converter; output-voltage distortion; photovoltaic generators; photovoltaic power systems; pulsewidth-modulation scheme; series-connected PV arrays; solar array; two-level inverter; Four-level three-phase diode-clamped dc–ac converter; Four-level three-phase diode-clamped dc-ac converter; multilevel; photovoltaic (PV) energy; photovoltaic array voltage control; photovoltaic energy; photovoltaic-array (PVA) voltage control; pulsewidth modulation; renewable energy; virtual vectors;
fLanguage :
English
Journal_Title :
Industrial Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0278-0046
Type :
jour
DOI :
10.1109/TIE.2008.924011
Filename :
4497160
Link To Document :
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