Large-scale shipboard energy storage systems (ESSs) integration can effectively improve the operating flexibility of all-electric ships (AESs) to mitigate irregular power fluctuations

but uncertain operating conditions such as shipboard swaying may protrude their state coupling characteristics

thereby affecting their power supply capability and exacerbating power mismatches. To address this issue

this paper proposes an integrated state-power control of shipboard ESSs. First

based on the battery test experiment of six months

considering frequent swaying conditions

this paper explores a state coupling model to establish a strong relationship between internal electrochemistry and external electrodynamics

thereby capturing the power control characteristics of the battery. Then

the proposed battery model is integrated into a real-time control loop

which can deal with the power fluctuations of multiple navigation conditions. Finally

the proposed method is proven in a laboratory-scale experimental system. Compared with the conventional methods

the voltage sag and the power mismatch can be reduced by 32.14% and 90.1% at most

respectively

and the battery can always operate within a healthy power range.