Affine Algorithm for Multi-energy Flow Calculation in Integrated Energy System with Consideration of Uncertainty

With the popularization of heat network and application of Combined Heat and Power (CHP) units, the coupling between power system and thermodynamic system becomes deeper and deeper. With the increasing penetration of intermittent distributed generations (DGs) and continuous fluctuation of power loads and heat loads, uncertainty analysis is needed to study the possible variation interval of the operation state of integrated energy system. In this paper, the models of power system, district heating network and coupling components are built firstly. Then, the affine algorithm is introduced into multi-energy flow analysis to deal with uncertain factors including load fluctuation and DG output. Finally, the case study proves that the affine algorithm for multi-energy flow calculation can calculate the lower and upper bounds of state variables of integrated energy system under uncertainty, which include the pipe mass flow rates in district heating network and the bus voltages in power system.