Abstract: The popularity of electric heating equipment in rural areas has led to an increase of the peak load of electricity. In order to ensure the reliability of the power system， the indoor building heat balance and the flexible comfort requirements of users can be comprehensively considered. So we propose a reliability assessment method for rural clean energy supply system on the basis of accurate modeling of user demand. Firstly， the architecture of rural clean energy supply system is constructed， including the grid-side equipment model and user-side building heat balance model. Secondly， we model the users flexible comfort requirements， which derive indicators of the reliability of energy supply considering flexible comfort requirements. Thirdly， the method of fault impact analysis for rural clean energy supply system is proposed， and the load reduction strategy at failure time and the process of reliability assessment are formulated. Finally， through practical examples， we compare the reliability index whether considering the users flexible comfort requirements and the building heat balance characteristics， which prove the improvement of the reliability of energy supply of the whole system due to the proposed method.

Key words: building heat balance, user comfort, clean energy supply system, load reduction, reliability assessment