Dual-DC-port inverters are attractive solutions for PV-battery hybrid systems since the DC/DC converter is removed and all the power can be transformed with a single-stage power conversion. However, it is challenging to design the control strategy for the dual-DC-port inverter due to the DC-port power distribution being highly coupled with grid-side current tracking. To deal with this issue, a power decoupled model is proposed in this article, where the reference voltage vector is decomposed into two parts. Then, a deadbeat power control is proposed for flexible DC-port power distribution by regulating the decomposed reference voltage vectors. The proposed control has the advantages of fewer computational burdens and fast dynamic response. And experimental results indicate that the proposed strategy has desirable steady-state and dynamic performance.