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Control of a Three-Phase Cascaded H-Bridge Multilevel Inverter for Stand-alone PV System

By M Raghu, Vamsi Goutham and Venu Gopala Rao M


Abstract- This paper presents a three-phase cascaded H-bridge converter for a stand-alone 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. Index Terms—Multilevel inverters, photovoltaic (PV) power systems, power conversion

Year: 2014
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