![]() In the traditional energy systems such as power grids and thermal networks, each energy system has an independent operating system, the coupling between them is not tight, and the energy efficiency is low. The development of the integrated energy system (IES) can make the allocation of resources more rational and optimal, which is a good way to deal with the huge energy consumption and resource depletion in the current era, and it is also a foundation for the complete transformation of the country’s energy structure in the future ( Moeini-aghtaie et al., 2014). ![]() In addition, a more comprehensive algorithm is proposed in this study, and the actual model is used in the fourth section of the article to verify that the algorithm can be practically applied. After the energy flow is solved, the optimization method of the electrothermal coupled system is studied to minimize the fuel consumption and obtain the minimum operating cost. In this study, to make full use of energy, a power system model considering a large number of distributed energy injections and a multi-source thermal system model are constructed. The application of the backpressure unit and the peak-shaving electric boiler makes the power grid and the heat grid connected and becomes an electro-thermal coupling system, which can be studied as a representative of the integrated energy system. With the contradiction between energy consumption and ecological protection becoming increasingly prominent, it has become a serious issue to study an energy system with high efficiency, low pollution, and strong controllability. 3State Grid Liaoning Electric Power Co., Ltd, Shenyang, China.2Key Laboratory of Regional Multi-energy System Integration and Control of Liaoning Province, Shenyang, China.1Shenyang Institute of Engineering, Shenyang, China.Zhaoying Li 1,2 Yan Zhao 1,2* Jian Xu 1,2 Qianzhi Shao 3
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