The Unified Energy Flow Algorithm Used Back/Forward Sweep Method for Urban Integrated Energy Systems

The energy flow calculation of integrated energy systems (IES) is complex and the algorithm is not uniform after decoupling. Taking into account the core position of the power system in the integrated energy systems, it is considered to apply the back/forward sweep method commonly used in distribution networks to the urban integrated energy systems, and propose a unified energy flow algorithm. The influence factor matrix method is used to deal with the multi PV node problem in the actual distribution network; the heating network adopts the method of decoupling the heat-supply network and the reheat network to simplify the complex model, the back/forward sweep method is applied to the energy flow calculation of the radial heating network; for the natural gas loop network, the idea of de-looping is adopted, and the linearized compensation airflow method is derived and obtained to realize the improvement of the algorithm suitable for the natural gas network. And the correctness and applicability of the method are verified by calculation examples.