A Novel Scheme Suitable for High-Voltage and Large-Capacity Photovoltaic Power Stations

The efficiency, power quality, and reliability of renewable energy power conversion systems are key factors for future industrial applications. This paper presents a novel scheme to improve the performances of high-voltage large-capacity photovoltaic (PV) power stations. The power conversion of the...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2013-09, Vol.60 (9), p.3775-3783
Main Authors: Zhang, Changzheng, Du, Shaowu, Chen, Qiaofu
Format: Article
Language:English
Subjects:
Arrays
Converters
Current source
Current sources
DC-DC power converters
Direct current
Electric potential
Electricity generation
Energy conversion
Harmonic analysis
photovoltaic (PV) power systems
Photovoltaic cells
Photovoltaic systems
Pulse width modulation converters
Solar cells
square wave superposition
Uninterruptible power supply
Voltage
voltage source
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Summary:The efficiency, power quality, and reliability of renewable energy power conversion systems are key factors for future industrial applications. This paper presents a novel scheme to improve the performances of high-voltage large-capacity photovoltaic (PV) power stations. The power conversion of the PV system is divided into two stages, i.e., dc/dc power conversion and dc/ac power conversion. In the dc/dc stage, many power units are connected in parallel, each one of which includes a PV array and a nonisolated dc/dc converter. The dc/ac power conversion is equivalent to a voltage source in series with a current source. Square wave converters, together with transformers, are employed for the voltage source, which is based on the multipulse technology of square wave superposition. Pulsewidth-modulated converters are employed for the current source. Simulated waveforms with a whole 10-MVA/10-kV PV system are shown, and experimental results with a 100-kVA/1-kV dc/ac prototype are displayed.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2012.2208438