An integrated multi-energy flow calculation method for electricity-gas-thermal integrated energy systems

• Main Authors: Mengting Zhu, Chengsi Xu, Shufeng Dong, Kunjie Tang, Chenghong Gu
• Format: Article
• Language: English
• Published: SpringerOpen 2021-02-01
• Series: Protection and Control of Modern Power Systems
• Subjects: Integrated energy system; Integrated multi-energy flow calculation; Newton-Raphson; Compressor; Per unit value and nominal value
• Online Access: https://doi.org/10.1186/s41601-021-00182-2

Abstract The modeling and multi-energy flow calculation of an integrated energy system (IES) are the bases of its operation and planning. This paper establishes the models of various energy sub-systems and the coupling equipment for an electricity-gas-thermal IES, and an integrated multi-energy flow calculation model of the IES is constructed. A simplified calculation method for the compressor model in a natural gas network, one which is not included in a loop and works in constant compression ratio mode, is also proposed based on the concept of model reduction. In addition, a numerical conversion method for dealing with the conflict between nominal value and per unit value in the multi-energy flow calculation of IES is described. A case study is given to verify the correctness and speed of the proposed method, and the electricity-gas-thermal coupling interaction characteristics among sub-systems are studied.