期刊名称：International Journal on Electrical Engineering and Informatics
印刷版ISSN：2085-6830
出版年度：2015
卷号：7
期号：1
DOI：10.15676/ijeei.2015.7.1.11
出版社：School of Electrical Engineering and Informatics
摘要：Photovoltaic (PV) panels are subjected to problems such as hot spots and reducedoutput power when operating in partially shaded conditions. Although bypass diodes areutilized to alleviate these problems, the diodes cause multiple-peak characteristics. Trackingthe maximum output power in partially shaded conditions is difficult using conventionalsoftware-based maximum power point tracking (MPPT) techniques. Curve tracers can assistsoftware-based MPPT to track the true/global maximum power point (MPP) by scanningseveral potential MPP areas. Therefore, a software-based MPPT with an I-V curve tracer is apreferred solution. Moreover, curve tracers reveal more about the PV array performance andthe fastest method to do so.This paper investigates the advantages and disadvantages of several I-V curve tracers andproposes a load self-adaptive PV panel characteristic curve tracer by applying a hysteretic selfcontrolledduty-modulated load resistor (DMLR) to a boost converter I-V curve tracer. Severaladvantages are achieved such as simple structure, cost-efficient implementation and no tracinglimitation near the Voc. A circuit for 72 W PV panel is used to verify the feasibility of theproposed curve tracer.
