In order to solve the problem that various energy sources in the traditional energy system are not tightly coupled

different energy sources are relatively independent

and the overall energy utilisation rate is not high

the integrated smart energy platform has become a problem that must be considered.Combine the integration of the Internet and energy to develop into an energy Internet

making energy“smart”is a brand-new energy management model.Therefore

the power flow calculation under the integrated energy system (IES) has become the focus and difficulty.This paper proposes an IES improved multi-energy flow calculation method

which is suitable for cold

heat

electricity

and gas.This paper firstly establishes the mathematical models of power

heat

and natural gas networks in IES.Secondly

based on the steady-state energy flow model of the natural gas system

a linearized model of the natural gas pipeline flow equation is constructed based on the piecewise linearization method;Based on this

an optimization model of the initial value of the natural gas system is established to obtain a good initial value.The linearized pipeline flow equation is used in the model to simplify the complexity of the model.Finally

the improved Newton-Raphson method is used to derive and obtain the Jacobian matrix reflecting the coupling relationship of multiple energy sources.The calculation example verifies the effectiveness of the method for calculating and analyzing the interaction characteristics of multi-energy flow.