Photovoltaic Power Conditioning System With Line Connection
Jung-Min Kwon
Kwang-Hee Nam
Bong-Hwan Kwon
Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol.;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: June 2006
Volume: 53,
Issue: 4
On page(s): 1048-1054
ISSN: 0278-0046
INSPEC Accession Number: 9064481
Digital Object Identifier: 10.1109/TIE.2006.878329
Current Version Published: 2006-08-07
Abstract
A photovoltaic (PV) power conditioning system (PCS) with line connection is proposed. Using the power slope versus voltage of the PV array, the maximum power point tracking (MPPT) controller that produces a smooth transition to the maximum power point is proposed. The dc current of the PV array is estimated without using a dc current sensor. A current controller is suggested to provide power to the line with an almost-unity power factor that is derived using the feedback linearization concept. The disturbance of the line voltage is detected using a fast sensing technique. All control functions are implemented in software with a single-chip microcontroller. Experimental results obtained on a 2-kW prototype show high performance such as an almost-unity power factor, a power efficiency of 94%, and a total harmonic distortion (THD) of 3.6%
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