A high-efficiency single-phase three-wire photovoltaic energy conversion system
Yeong-Chau Kuo
Tsorng-Juu Liang
Jiann-Fuh Chen
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Feb 2003
Volume: 50,
Issue: 1
On page(s): 116- 122
ISSN: 0278-0046
INSPEC Accession Number: 7517984
Digital Object Identifier: 10.1109/TIE.2002.807252
Current Version Published: 2003-01-29
Abstract
A single-phase three-wire photovoltaic energy conversion system with single-stage structure using a novel maximum power-point tracking (MPPT) algorithm is presented. An equivalent model of the proposed system is derived to analyze the characteristics of the system and to design the controller. Owing to the linear relation of the PV array parameters versus insolation, the model is easy to analyze. The proposed system employs a three-leg inverter to control the MPPT process, the line current, and neutral line current. A current-controlled MPPT algorithm controls the MPPT. A neutral line-mode controller maintains a utility neutral line current of zero. A line-mode controller controls the line current so as to provide power to the utility with a unity power factor. The proposed system acts as a solar generator on sunny days and functions as an active power filter on rainy days. Computer simulation and experimental results demonstrate the accuracy and the superior performance of the proposed technique.
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