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Impact of PV String Shading Conditions on Panel Voltage Equalizing Converters and Optimization of a Single Converter System with Overcurrent Protection
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| Author(s) |
Matthias KASPER, Stefan HERDEN, Dominik BORTIS, Johann Walter KOLAR |
| Abstract |
Unequal irradiance of series connected PV panels in a string strongly decreases the output power of thePV system, as either PV panels are bypassed or operated below their MPP. By connecting balancingconverters around each pair of adjacent PV panels, all panels can maintain the operation close to theirMPP regardless of any mismatched operating condition. In this paper a balancing converter conceptwith ZVS is introduced and the operation of a string of PV panels equipped with balancing convertersis analytically described. Based on this analytic framework, different examples of shading scenarios ofa PV string are examined regarding the average inductor current values that occur within the balancingmodules, in order to derive the required specifications of a balancing converter. Moreover, a two-levelovercurrent protection concept is introduced which enables to keep all balancing converters within thesafe operating area at all times, even at shading conditions with high mismatch. Furthermore, the designoptimization of a highly efficient PV voltage balancing converter with a wide input voltage range isexplained in detail and finally the concept is verified with measurement results of a demonstrator system. |
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| Filename: | 0269-epe2014-full-10574822.pdf |
| Filesize: | 1.502 MB |
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| Type |
Members Only |
| Date |
Last modified 2015-06-08 by System |
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