State Estimation of Electric-gas Network

Abstract

With the rapid economic and social development, users have paid more attention to the quality of energy use, and their demand for energy has also increased significantly. In order to improve power supply efficiency, alleviate energy shortages, and improve the ecological environment, researchers have proposed the application of new energy technologies such as renewable energy, distributed power generation, and electric vehicles to replace the original fossil fuel. At the same time, scientists promote the development of a multi-energy coupling energy Internet based on “’Internet+” and intelligence in order to advance the energy revolution. In order to conform to the trend of the times and meet the needs of users, the integrated energy system, which is characterized by multiple energy complementarity and energy ladder utilization, has become the main energy utilization mode due to its unique economy, environmental protection and energy saving. The integrated energy system transforms and couples electricity, heat, cold, gas and other energy sources through cogeneration units, electric hydrogen generation units, gas turbines and other equipment. Since the gas network has less loss than heat network in the transmission process, it is suitable for long-distance transportation at the city level and above. Therefore, the integrated electric-gas energy system has quickly become the focus of integrated energy research. Similar to the electric power system, integrated energy system also needs state estimation to monitor the operation of energy system to ensure the stability of energy supply. This paper mainly conducts a more in-depth study on modeling and state estimation algorithm of the integrated electric-gas energy system.