The complementary characteristics of power system and thermal system can be used in the integrated electricity-heat energy system to enhance the system flexibility and improve renewable energy accommodation further. Since the power system and the thermal system are coupled by combined heat and power(CHP)units and power-to-heat equipment

the dynamic characteristics of transmission time delay and heat loss on the heating pipelines in the heat system and the user flexible demand for thermal energy are comprehensively taken into account. Then this paper develops an optimal dispatch model of integrated electricity-heat energy system considering heat storage characteristics of the heating network. The coupled system constructed by an IEEE 39-bus distribution network and a 26-bus heat system is taken as an example. Its results show that the proposed model can coordinate the source

grid and load in the integrated electricity-heat energy system and realize optimal matching of heat and power through time shift of energy

thus promote the high proportion accommodation of renewable energy. Based on the real data of Jianshan district in Haining

Zhejiang Province

China. the second example demonstrates the effectiveness of using centralized heating to enrich the terminal consumption in the power system with high proportion of renewable energy.