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This paper proposes a residential 10kWh lithium-polymer battery energy storage system. Considering a daily load profile, PV generation characteristic and battery SOC(State of Charge), operation modes are divided and algorithm is proposed. Concepts are to charge the battery during the night and to use the energy charged into the battery during the day time. A boost converter is used for maximum power point tracking(MPPT) and a perturbation and observation algorithm is applied to control MPPT in this paper. A bi-directional dc-dc converter is used to charge or discharge the battery and a constant current control is used for charging method. A bi-directional inverter performs the synchronization between dc power and ac power. Operation modes are verified through simulation. Index Terms -Photovoltaic power generation systems, Battery energy storage systems(BESS), Maximum power point tracking(MPPT), Bi-directional DC/DC converter.

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-This paper proposes a State-of-Charge (SOC) balancing control of Battery Power Modules (BPMs) for a modularized battery for Electric Vehicles (EVs) without additional balancing circuits. The BPMs are substituted with the single converter in EVs located between the battery and the inverter. The BPM is composed of a two-phase interleaved boost converter with battery modules. The discharge current of each battery module can be controlled individually by using the BPM to achieve a balanced state as well as increased utilization of the battery capacity. Also, an SOC balancing method is proposed to reduce the equalization time, which satisfies the regulation of a constant DC-link voltage and a demand of the output power. The proposed system and the SOC balancing method are verified through simulation and experiment.