Integrating offshore wind power into offshore isolated power grids is one of the key approaches to achieving the "dual carbon" goals. However

with the high proportion of offshore wind power

the offshore isolated power grid dominated by new energy faces challenges such as power balance and frequency stability. To address these issues

this paper proposes an optimal configuration method of energy storage for an offshore isolated power grid dominated by a high proportion of new energy. First

considering that the battery energy storage system (BESS) participates in primary frequency regulation and emergency frequency support

the frequency stability constraints of BESS are constructed. Second

a two-layer optimal configuration model for energy storage is developed

aiming to maximize economic benefits. The outer layer model incorporates the adaptive state of charge (SOC) strategy and frequency stability constraints

while the inner layer model considers the operation of cold generators. Third

the two-layer model is solved using CPLEX and the Salp Swarm Algorithm to obtain the optimal configuration of BESS. Finally

the proposed method is validated using an offshore isolated power grid. The results demonstrate that the proposed method improves the frequency stability

economic performance

and wind power utilization of offshore isolated power grid while reducing the number of start-stop cycles of cold generators.