Abstract
A novel stand-alone photovoltaic (PV) system is proposed, which exhibits the advantages of better protection and more efficient control on charge/discharge of the battery. Furthermore, it can realize energy management of the system. The key point of energy management is how to control the bi-directional converter effectively. Considering traditional soft start strategy would be ineffective for bi-directional converter in the double sources application for the possibility of damaging the power device, a new soft start control strategy named delay synchronizing rectification control strategy is proposed. A 500 W prototype converter is built to verify the theoretical analysis and the control strategy.
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