In this paper a novel distributed photovoltaic power architecture using advanced lithium-ion batteries is proposed, which is mainly composed of a switched mode power converter and a power management system. This system exhibits the advantages of better protection and more efficient control on charge/discharge of the battery than the traditional photovoltaic power system. Furthermore, better use of solar energy and energy management system can be done. The key point of energy management system is to control the dc-to-dc converter with an MPPT control strategy and to control energy transfer between the photovoltaic panel, the battery and the load. Associated in parallel, power modules M PV_STOR allow higher power depending on the application. In addition, new algorithms are implemented to optimize the use of the battery making the overall system more reliable.

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Abstract. An approach to the analysis and design of a bidirectional DC power converter for the cell voltage balancing control of a series connected lithium-ion battery string is presented in this paper. The proposed Cell Balancing Circuit (CBC) is designed to transfer the energy from the fully charged battery cell to the weakest one using a switch mode power converter operation. This operation maintains cell batteries at the same State-Of-Charge (SOC) and voltage range. Unlike previous battery balancing circuits, the balancing method uses only one magnetic component, resulting small size system. Simulation and experimental results show that the proposed cell balancing method can not only enhance the bidirectional battery equalization performance, but can also reduce the switching loss during the equalization period. Experiment results are provided to verify the operating principle of the proposed balancing method. Specific conditions of experiments are used to reproduce photovoltaic operations.

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