Simulated Study on Nonisolated DC-DC Converters for MPP Tracking for Photovoltaic Power Systems
Publication: Journal of Energy Engineering
Volume 142, Issue 1
Abstract
This paper discusses a comparative investigation of the three basic nonisolated DC-DC converters used as interfaces for maximum power point tracking (MPPT) in photovoltaic (PV) generators using the direct duty ratio control tracking algorithm. Analysis of buck, boost, and buck-boost converters is undertaken to study the behavior of converter performance with respect to changing atmospheric conditions, in-turn duty ratio variation (as a result of MPPT), and tracking efficiency. As atmospheric conditions change, the operating value of resistance at the maximum power point () changes. To effectively drive the system at the maximum power yield point, the MPPT algorithm has to drive the system operation point close to the value of for the varying atmospheric profile of change in insolation and temperature. The efficiency of the MPPT algorithm lies in meeting this very requirement. The simulation study shows that, although buck, boost, and buck-boost converters are used as power converters in MPPT applications, not all converters perform with high efficiency. The effect of different resistive loads that have values other than on converter-side output is considered for the three topologies, and it is observed that the buck-boost converter is the only one that is able to track the maximum power point (MPP) under variations in insolation, temperature, and loading effect with the highest tracking efficiency.
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Published In
Journal of Energy Engineering
Volume 142 • Issue 1 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Apr 4, 2014
Accepted: Nov 26, 2014
Published online: Jan 8, 2015
Discussion open until: Jun 8, 2015
Published in print: Mar 1, 2016
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