Objective  This article aims to solve the problem of unstable and fluctuating offshore wind power output to improve the utilization rate of transmission channels.

Method  Based on the Eastern Guangdong Large Energy Base, using a multi-energy integration and complementation development model and energy storage regulation methods, a quantitative analysis was conducted on the capacity ratio of offshore wind power and thermal power units. By adopting grid-forming wind turbines, the "wind-thermabundling" was implemented for joint transmission. Technologies including in-situ hydrogen production from seawater, carbon capture utilization and storage (CCUS), and CO₂ synthesis into methanol were applied to tap the potential for carbon reduction and power absorption, reduce wind curtailment of offshore wind power projects, and fit the transmission effect of wind-thermal-storage bundling.

Result  When the capacity ratio of offshore wind power to thermal power units is 2.1:1, the installed capacity ofoffshore wind power can be maximized on the premise of limited transmission channel capacity and no wind curtailment. The multi-energy integration and complementation developmentmodel optimizes the overall external power transmission characteristics of transmission channels, reduces curtailment of photovoltaic and wind power and improves the utilization rate of existing channels.

Conclusion  The multi-energy integration and complementation development model is the optimal transmission mode for offshore wind power scenarios and plays a qood demonstration role in the development of offshore wind power bases, The research has feasibility and provides a reference for design scheme of the same type.