Battery Less Solar Power Controller to Drive Load at Constant Power Irrespective of Solar Radiation
Abstract: In this paper, a 12V, 2.4W battery less solar power controller (BLSPC), capable of driving load at constant low power, has been proposed, designed and practically implemented with minimal efficiency sacrifice irrespective of solar radiance variation. This device utilizes power electronic circuits, more specifically a Buck-Boost DC-DC converter along with Maximum Power Point Tracking (MPPT) algorithm to perform the desired task. Starting from 100w/solar radiation the controller can provide constant power 2.4 watts at 12V without using any storage facilities. The output voltage can be adjusted to any desired level from 0V to 12V DC depending on the application at consumer premises. In this work, efficiency up to 90% at shadow weather phenomenon has been achieved. Moreover, this power controller can be used in consumer premises for direct-coupled system with solar panel irrespective of solar radiation variance.
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