The vigorous development of renewable energy and the reduction of carbon emissions represent a global trend in energy sector development. For port power grids, the utilization of locally abundant renewable energy sources such as wind and solar power to supply energy for port electrical equipment can fundamentally reduce carbon emissions and realize the concept of green ports. However, the characteristics of green ports, including a high proportion of renewable energy integration and low rotational inertia, coupled with load disturbances generated during the startup and shutdown of large-scale equipment, pose significant challenges to power system stability. In this research, a wind-storage system model was constructed in the DIgSILENT/PowerFactory, where deadband configurations enable prioritized frequency regulation coordination between doubly-fed induction generator-based wind turbines and battery energy storage systems. Furthermore, the energy storage system incorporates SOC-based variable droop coefficient primary frequency regulation, effectively preventing potential overcharging and over-discharging scenarios. Simulation results validate the effectiveness of the proposed method in maintaining active power-frequency stability and providing inertia support to the system.