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A novel method is used for projecting and implementing a current control loop as a means for regulating the power flow originated of a photovoltaic generator, based on three-phase nonautonomous static converter dc-ac functioning as an inverter. The maximum efficiency is the main issue presented in this work. A strategy for tracking the maximum power point (MMPT) for several solar insolation levels has been used in this paper. The control loop circuit, a three-phase nonautonomous static converter dc-ac, operating as inverter, is experimentally mounted to verify the proposed control strategy performance. Since the characteristic volt-ampere of a photovoltaic array depends on solar cell temperature, on sunshine incident, and on load, it is very difficult to achieve an optimum matching at all insolation levels and at all temperature variations. In this work the temperature effect will be neglected, since in our region (north of Brazil), the temperature remains approximately constant, around 30 degrees Celsius. In this regard, the temperature variations will be neglected.
Instrumentation and Measurement, IEEE Transactions on (Volume:53 , Issue: 4 )
Date of Publication: Aug. 2004