Considering the multiple time scales of integrated energy system(IES)

thermal inertia of thermal subsystem and basic operation strategies complementary multiple energy

a method of reliability evaluation for IES is proposed. Firstly

in order to calculate the support capacity of each subsystem in different time intervals and the index of reliability gain for complementary multiple energy

characteristics of complementary multiple energy for IES are discussed based on the energy hub model. Then

the thermal inertia is modeled in quasi-steady state. The exergy difference and specific features of different energy are described by energy analysis

and the system basic operation strategy is set. Finally

the reliability of IES is calculated by Monte Carlo method based on Markov chain. The simulation results of a user-level for IES in Germany show that

when the energy flow input of a subsystem is insufficient

mutual operation will bring greater reliability gain

and the current reliability evaluation method without considering thermal inertia is conservative.