## 1 Introduction  
With the increasing proportion of renewable energy in the whole energy supply, its consumption has increasingly become one of key problems to be solved, and the abandonment of wind turbine (WT) power and photovoltaic (PV) power has not been solved [1]. According to the statistics of the National Energy Administration of China, the annual abandonment of WT power in China reached 41.9 billion kWh in 2017 [2]. The abandonment rate of WT power in some areas of China has exceeded 40%. The western region is an important area for the development of PV power in China and its installed PV capacity is still growing rapidly, but the average abandonment rate of PV power in China has reached 20%. The reasons for the abandonment of WT and PV powers are different from place to place, mainly due to the factors such as thermal-electric coupling, inadequate local consumption capacity, and limitation of transmission line capacity [3,4]. Taking Jianshan District, Haining, Zhejiang Province of China as an example, in 2018, the total installed capacity of WT and PV power in this region was 230 MW, and its load level was only around 150 MW, which is a typical area with abundant renewable energy. Under normal circumstances, the area basically achieves self-balancing of electric power. But under special circumstances, the loads of the industrial area during the holidays, for example, are drastically reduced, and it is impossible to achieve self-balancing of electric power. The excess energy could only be transferred back to the 220 kV Anjiang Substation through the 110 kV Jianshan Substation, or even be transferred to the transmission system through the 220 kV Anjiang Substation. However, due to the capacity limitation of the main transformer in the Jianshan Substation, the Jianshan distribution systems cannot fully meet the needs of the delivery of the excess renewable energy. The limited capacity of WT and PV has reached 97 MW, and the limited proportion has reached 42.17%. The integrated energy system (IES) coordinates the various forms of energy systems such as the distribution systems, the renewable energy systems, and the traffic systems considering electric vehicles (EVs) and the combined cooling, heating, and power (CCHP) systems, which could realize the optimal utilization of various types of energy and effectively solve the consumption problem of renewable energy [5]. In [6], the optimization of the IES including district heating, cooling, and various forms of energy storage in Singapore was performed, and the results show that the cost of energy through methane storage or heat storage is much less than that of using electricity storage or hydrogen storage when the space constraints of photovoltaic installations are taken into consideration. In [7; 8], the consumption rate of WT in the CCHP systems is improved through energy storage, the output of the CCHP units is reduced when the WT surges, and the energy storage device is utilized to meet the user's cooling and heating demand for reducing the abandoned power of WT. Generally, the installation costs of energy storage devices are relatively high and energy storage devices cannot consume renewable energy very well when their installed capacity is small. However, the cooling loads and the heating loads have natural energy storage characteristics as flexible resources, and there is no costly problem, which could replace part of energy storage devices. However, most of the existing research considers a given heating/cooling load curve, and the energy storage characteristics of the heating/cooling systems are not fully considered. In [9], the heat storage characteristics of the heating pipeline are coordinated with the operation of the power systems, and the thermal-electric decoupling is performed to realize flexible heating for improving the consumption rate of WT.