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EnglishA 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.
| Titolo: | A novel dc voltage regulation scheme for dual-inverter grid-connected photovoltaic plants |
| Autore/i: | GRANDI, GABRIELE; D. Ostojic; CASADEI, DOMENICO |
| Autore/i Unibo: | |
| Anno: | 2009 |
| Titolo del libro: | Proceedings of the 8th International Symposium on Advanced Electromechanical Motion Systems, ELECTROMOTION 2009 |
| Pagina iniziale: | 1 |
| Pagina finale: | 6 |
| 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. |
| Data prodotto definitivo in UGOV: | 5-feb-2010 |
| Appare nelle tipologie: | 4.01 Contributo in Atti di convegno |
File in questo prodotto:
http://hdl.handle.net/11585/83096
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