I. Introduction
Over the years, renewable energy, especially wind power, has grown significantly around the world. However, with the vigorous development of wind power, the phenomenon of wind curtailment has always existed in areas with abundant wind resources in China. In order to make full use of wind resources and accelerate the low-carbon transformation of power grid, how to effectively cope with the problem of wind abandonment has always been a great challenge for the industry. To sum up, the main reasons for the wind curtailment are as follows. First, the flexibility of power system is insufficient, and the regulation ability is lacking. It is known that wind power bears strong uncertainty, and it is difficult to accurately predict wind power based on current technology [1]. Therefore, the power system needs to be flexible enough to accommodate uncertain wind power. In addition, for some regions with large-scale wind farms and coal-dominated power structure such as the three-north region in China, the combined heat and power (CHP) units are mainly used to realize central heating for heat users during the cold season, resulting in a further decline in the flexibility of power system due to the strong coupling between electricity and heat. Second, there is no way to accommodate all the wind power due to the low local load level. In particular, the ‘antipeaking' characteristics of wind power further exacerbate this problem. In addition, in the cold season, the CHP unit will generate a large amount of electric power when heating, which further reduce the accommodation space of wind power. In this case, if the power-to-heat devices are configured in the wind/CHP hybrid energy system to realize wind power heating, which can effectively improve flexibility of power system and promote wind power accommodation.