Aiming at the typical integrated electricity and gas system(IEGS)

the static sensitivity analysis method based on the unified power flow model is used to analyze the interaction mechanism between the electric power and gas supply system in the system. Firstly

the unified power flow model of the IEGS is given. On this basis

the gas pressure-node injection power sensitivity matrix of the IEGS is defined. Finally

combined with the regional comprehensive energy system sensitivity index

the impact of node injection power of power grid on gas pressure is analyzed

and the weak links of regional integrated energy system are located. The results show that the proposed method can provide auxiliary information for the safe and stable operation of regional integrated energy system

and effectively enhance the security of the system.