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Ambient energy is a good supplement to existing hybrid power systems. Among the available options, solar is one of the most readily obtainable and technologically compatible sources. However, uncertainty of sun radiation intensity and changing atmospheric conditions impose challenges in efficient usage of sun power. Significant progress has been made during the last decades in optimally harvesting solar energy for single input power system. However, little literature focuses on the control and coordination of solar energy conversion with other actively controlled sources and storages. This paper proposes the operation and control of solar power conversion in Multiport Power Electronic Interface (MPEI) for different modes of operation: load sharing mode and battery recovery mode. The control structure for solar maximum power point tracking (MPPT) in load sharing mode is proposed for optimal harvesting from solar panel and to provide immunity to load dynamics. Current-Mode Maximum Power Transfer (CMMPT) method is proposed to transfer maximum power to battery during charge recovery. The control system is implemented in a TMS320F2812 DSP and experimental results are presented to prove the effectiveness of proposed control system.
Date of Conference: 21-25 Feb. 2010