A multilevel power conversion scheme for three-phase grid-connected photovoltaic (PV) generation systems is considered in this paper. The scheme is based on two insulated strings of PV panels, each one feeding the dc bus of a standard two-level three-phase voltage source in-verter (VSI). Inverters are connected to the grid by a three-phase transformer having open-end windings on inverters side. The resulting conversion structure performs as a multilevel power active filter, doubling the power capability of a single VSI with given voltage and current ratings. The multilevel voltage waveforms are generated by an improved space vector modulation, suitable for the implementation in industrial DSPs. A novel control scheme is proposed to regulate the two dc-link voltages of the multilevel converter according with the requirement of a MPPT algorithm. The whole generation system has been verified by experimental tests with reference to different operating conditions.

A novel dc voltage regulation scheme for dual-inverter grid-connected photovoltaic plants

GRANDI, GABRIELE;CASADEI, DOMENICO
2009

Abstract

A multilevel power conversion scheme for three-phase grid-connected photovoltaic (PV) generation systems is considered in this paper. The scheme is based on two insulated strings of PV panels, each one feeding the dc bus of a standard two-level three-phase voltage source in-verter (VSI). Inverters are connected to the grid by a three-phase transformer having open-end windings on inverters side. The resulting conversion structure performs as a multilevel power active filter, doubling the power capability of a single VSI with given voltage and current ratings. The multilevel voltage waveforms are generated by an improved space vector modulation, suitable for the implementation in industrial DSPs. A novel control scheme is proposed to regulate the two dc-link voltages of the multilevel converter according with the requirement of a MPPT algorithm. The whole generation system has been verified by experimental tests with reference to different operating conditions.
Proceedings of the 8th International Symposium on Advanced Electromechanical Motion Systems, ELECTROMOTION 2009
1
6
G. Grandi; D. Ostojic; D. Casadei
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/83096
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