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Kim, Katherine A.
Power Electronics for Advanced Renewable Systems Lab
Research Interests
  • power electronics, DC-DC converter control, converter simulation, photovoltaic modeling, differential power processing converters, energy harvesting, power for wearable applications

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Differential Power Processing for Increased Energy Production and Reliability of Photovoltaic Systems

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Title
Differential Power Processing for Increased Energy Production and Reliability of Photovoltaic Systems
Author
Shenoy, Pradeep S.Kim, Katherine A.Johnson, Brian B.Krein, Philip T.
Keywords
Differential power processing; local control; maximum power point tracking (MPPT); photovoltaic power; renewable energy
Issue Date
2013-06
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON POWER ELECTRONICS, v.28, no.6, pp.2968 - 2979
Abstract
Conventional energy conversion architectures in photovoltaic (PV) systems are often forced to tradeoff conversion efficiency and power production. This paper introduces an energy conversion approach that enables each PV element to operate at its maximum power point (MPP) while processing only a small fraction of the total power produced. This is accomplished by providing only the mismatch in the MPP current of a set of series-connected PV elements. Differential power processing increases overall conversion efficiency and overcomes the challenges associated with unmatched MPPs (due to partial shading, damage, manufacturing tolerances, etc.). Several differential power processing architectures are analyzed and compared with Monte Carlo simulations. Local control of the differential converters enables distributed protection and monitoring. Reliability analysis shows significantly increased overall system reliability. Simulation and experimental results are included to demonstrate the benefits of this approach at both the panel and subpanel level.
URI
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DOI
10.1109/TPEL.2012.2211082
ISSN
0885-8993
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EE_Journal Papers
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