State Estimation of Integrated Electricity-Water System Based on Darcy-Weisbach Formula

Nowadays, the integrated energy system (IES) has become an inevitable development trend for energy systems. With the deepening coupling relationship between the power system and the water network, the advantages of the integrated electricity-water system (IEWS) in reducing operating costs and improving energy efficiency are highlighted gradually. However, the existing research on the state estimation (SE) of IEWS ignores the difference of various kinds of pipe’s head loss formulas. This paper proposes an integrated state-estimation framework for IEWS based on an accurate head loss formula for pipes which considers the influence of fluid physical properties with a broader application scope in flow rate. Bi-level SE framework calculates the friction factor of all pipes to get a precise SE model. Finally, a test IEWS which consists of an 11-node water network and an 18-bus power system is used to verify the effectiveness of the computational framework at high flow rate.