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Control of a Single-Phase Cascaded H-Bridge Multilevel Inverter for Grid-Connected Photovoltaic Systems

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4 Author(s)
Villanueva, E. ; Electron. Eng. Dept., Univ. Tec. Federico Santa Maria, Valparaiso, Chile ; Correa, P. ; Rodriguez, J. ; Pacas, M.

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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Industrial Electronics, IEEE Transactions on  (Volume:56 ,  Issue: 11 )