In the integrated energy system

the electrical and thermal systems are connected through coupling elements The violation of the node variables of any subsystem may lead to unstable and unsafe operation of the entire integrated energy system.To this end

the static voltage and air pressure safety and stability margin indicators of the integrated energy system and strategies to improve the security of the integrated energy system are proposed.First

a model of the electrical and thermal system in the integrated energy system is constructed

and the coupling hub adopts the energy hub model；secondly

the alternating solution method of Newton-Raphson method is used to solve the multi-energy flow equation of the integrated energy system；next

the static voltage and pressure safety are given Margin range and related safety strategies:Based on the given safety margin index

use the sensitivity method to analyze the safety margin of state variables such as node voltage and air pressure under load disturbance to determine the weak links of the system；finally

select an appropriate strategy to Ensure that the system's node voltage and node air pressure meet safety margin requirements after load fluctuations.The calculation example analysis shows that the method proposed in this paper to determine system weak links is more efficient

and the proposed strategy can help improve the system security of the integrated energy system and enable it to operate reliably.