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A New Multilevel Conversion Structure for Grid-Connected PV Applications

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4 Author(s)
Grandi, G. ; Dept. of Electr. Eng., Univ. of Bologna, Bologna, Italy ; Rossi, C. ; Ostojic, D. ; Casadei, D.

A novel scheme for three-phase grid-connected photovoltaic (PV) generation systems is presented 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 inverter (VSI). The inverters are connected to the grid by a three-phase transformer having open-end windings on the inverter side. The resulting conversion structure performs as a multilevel power active filter (equivalent to a three-level inverter), 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 algorithm, suitable for the implementation in industrial digital signal processors. An original control method has been introduced to regulate the dc-link voltages of each VSI, according to the voltage reference given by a single maximum power point tracking controller. The proposed regulation system has been verified by numerical simulations and experimental tests with reference to different operating conditions.

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