Conventional maximum power point tracking (MPPT) controllers only use one loop tracking. The fast changes of atmospheric conditions result in power loss in the tracking process. In this paper, two-loop MPPT of solar array using a current converter is presented. The solar array is treated as a current source model instead of the traditional voltage source. A current converter operating in MPPT mode under different insolations and temperatures is designed for a solar power system. The principle of energy conservation is used to develop the small-signal model and transfer function for the solar power system. Using principle of energy conservation, the drawback of state-space-averaging method can be overcome. A digital PI compensator is used to implement the proposed MPPT control in real-time, and the effect of the floating operation by the fixed-point processor is also considered. Simulations and experimental results are presented to demonstrate better performance for the proposed system.
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