High-Gain DC-DC Conversion for Parallel Photovoltaic Arrays
A new approach to photovoltaic (PV) arrays is proposed based on a parallel connection scheme. In a series-connected array, differing insolation due to shading or obstructions causes disproportionate reduction in power output. Because operating voltage is governed more by temperature than by insolation, a parallel-connected array is much more robust to the shading effect. Direct paralleling is inappropriate due to the low voltage of a conventional PV module. Therefore, high-gain dc-dc converters are introduced in the proposed system. Three converter types are discussed. Two use transformers to increase gain and one uses a tapped inductor. Experimental results validate the concept and demonstrate tracking accuracy up to 99.87% despite a 39% difference in insolation, and weighted efficiency of up to 92.9%.
Z. S. Johnson et al., "High-Gain DC-DC Conversion for Parallel Photovoltaic Arrays," Proceedings of the 28th Annual IEEE Applied Power Electronics Conference and Exposition (2013, Long Beach, CA), pp. 2871-2875, Institute of Electrical and Electronics Engineers (IEEE), Mar 2013.
The definitive version is available at http://dx.doi.org/10.1109/APEC.2013.6520705
28th Annual IEEE Applied Power Electronics Conference and Exposition (2013: Mar. 17-21, Long Beach, CA)
Electrical and Computer Engineering
National Science Foundation (U.S.)
California Energy Commission. Energy Innovations Small Grant Program
Keywords and Phrases
DC-DC Conversion; Operating Voltage; Parallel Connections; Parallel-Connected; Photovoltaic Arrays; Series-Connected; Tapped Inductor; Tracking Accuracy; DC-DC Converters; Electric Connectors; Incident Solar Radiation; Photovoltaic Cells; Power Electronics
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Article - Conference proceedings
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