NDLI: A New Multilevel Conversion Structure for Grid-Connected PV Applications

Content Provider	IEEE Xplore Digital Library
Author	Grandi, G. Rossi, C. Ostojic, D. Casadei, D.
Copyright Year	1982
Abstract	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.
Sponsorship	IEEE Industrial Electronics Society
Starting Page	4416
Ending Page	4426
Page Count	11
File Size	1370757
File Format	PDF
ISSN	02780046
Volume Number	56
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Inverters Voltage control Photovoltaic systems Solar power generation Mesh generation Power transformer insulation Phase transformers Active filters Signal generators Signal processing algorithms power conditioning Multilevel systems photovoltaic (PV) power systems
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering Computer Science Applications

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