Operation of PV Cells with Two-String Maximum Power Point Trackers Using DC Distribution
DOI:
https://doi.org/10.51983/ajsat-2014.3.1.783Keywords:
Maximum power point tracker (MPPT), PV panel, Current balancingAbstract
This paper presents operational control of two maximum power point trackers(MPPTs) for two-string photovoltaic (PV) panels in dc distribution systems. Two PV strings and two MPPTs are implemented in this system. The proposed MPPT topology consists of buck and boost converters to deal with wide output voltage range of PV panels. The current balancing of two MPPT modules in parallel is achieved. In this paper, the system configuration and the operational principle of the proposed MPPT are first introduced. Flowcharts of the online PV-string configuration check and current balancing are explained. Current balancing in MPPT modules is done to provide thermal protection and to increase the reliability and life time of components present in the modules The validity of configuration check and current balancing is verified by the experimental results. Maximum power tracking performance and power conversion efficiency are obtained.
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