Wind-thermal bundled transmission is considered an important way to promote wind power accommodation. One of the difficulties lies in setting the optimal bundled wind-thermal capacity ratio. This paper proposes a method for setting the optimal ratio based on chronological operation simulation. First, the annual output characteristics of the planned wind power are obtained through meteorological data. Then, an hourly chronological operation simulation model is established, aiming at the lowest total operating cost of the system and the highest clean energy accommodation rate. The simulation model is analysed with time domain partitioning and a rollback mechanism to accelerate the computation speed. One-year hourly simulation results are further checked and adjusted to avoid potential transient stability risks. Finally, taking the Northwest region of Guangdong Power Grid as an example, by comparing the wind power accommodation capacity and operating economic data under different wind-thermal ratios, the optimal setting of the wind-thermal-bundled capacity ratio is recommended considering the effects of environmental protection, safety and economy. The results of the simulation can provide guidance for the planning and construction of offshore wind power and power system dispatch. This work is supported by the National Natural Science Foundation of China (No. 52022035) and the Key Planning Thematic Project of Guangdong Power Grid Corporation (No. 030000QQ00190006).