The multisource inverter is promising in integrating batteries with renewable energy sources, as the DC-DC converter normally required for battery power control can be eliminated. This single-stage conversion structure can reduce system cost and improve overall efficiency. This paper proposes a direct power control strategy for the battery connected to a multisource inverter. The proposed control strategy is directly implemented within the modulation process. A zero-loop-width hysteresis controller is employed to regulate the battery current by injecting an appropriate positive or negative zero-sequence signal. The method eliminates the need for control parameter design and features simple implementation and low computational burden, making it promising for practical applications. Steady-state and dynamic experimental results under different degrees of capacitor voltage imbalance demonstrate the effectiveness of the proposed method.
