Control of a Single-Phase Cascaded H-Bridge Multilevel Inverter for Grid-Connected Photovoltaic Systems
Villanueva, E.
Correa, P.
Rodriguez, J.
Pacas, M.
Electron. Eng. Dept., Univ. Tec. Federico Santa Maria, Valparaiso, Chile;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Nov. 2009
Volume: 56,
Issue: 11
On page(s): 4399-4406
ISSN: 0278-0046
INSPEC Accession Number: 10909333
Digital Object Identifier: 10.1109/TIE.2009.2029579
First Published: 2009-08-28
Current Version Published: 2009-10-09
Abstract
This paper presents a single-phase cascaded H-bridge converter for a grid-connected photovoltaic (PV) application. The multilevel topology consists of several H-bridge cells connected in series, each one connected to a string of PV modules. The adopted control scheme permits the independent control of each dc-link voltage, enabling, in this way, the tracking of the maximum power point for each string of PV panels. Additionally, low-ripple sinusoidal-current waveforms are generated with almost unity power factor. The topology offers other advantages such as the operation at lower switching frequency or lower current ripple compared to standard two-level topologies. Simulation and experimental results are presented for different operating conditions.
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