High-Performance Stand-Alone Photovoltaic Generation System
Rong-Jong Wai
Wen-Hung Wang
Chung-You Lin
Yuan Ze Univ., Chung Li;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Jan. 2008
Volume: 55,
Issue: 1
On page(s): 240-250
ISSN: 0278-0046
INSPEC Accession Number: 9756567
Digital Object Identifier: 10.1109/TIE.2007.896049
Current Version Published: 2008-01-04
Abstract
This study develops a high-performance stand-alone photovoltaic (PV) generation system. To make the PV generation system more flexible and expandable, the backstage power circuit is composed of a high step-up converter and a pulsewidth-modulation (PWM) inverter. In the dc-dc power conversion, the high step-up converter is introduced to improve the conversion efficiency in conventional boost converters to allow the parallel operation of low-voltage PV arrays, and to decouple and simplify the control design of the PWM inverter. Moreover, an adaptive total sliding-mode control system is designed for the voltage control of the PWM inverter to maintain a sinusoidal output voltage with lower total harmonic distortion and less variation under various output loads. In addition, an active sun tracking scheme without any light sensors is investigated to make the PV modules face the sun directly for capturing the maximum irradiation and promoting system efficiency. Experimental results are given to verify the validity and reliability of the high step-up converter, the PWM inverter control, and the active sun tracker for the high-performance stand-alone PV generation system.
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