Low-carbon Optimal Dispatching of Integrated Energy System Based on Ultra-supercritical Units

Currently, the power industry is still dominated by traditional coal-fired thermal power units. Ultra-supercritical (UCS) units are widely used in most areas of my country due to their large installed capacity and high cycle thermal efficiency. However, it produces large carbon emissions during the power generation process and fails to meet the demand for diversified energy sources in some regions. Therefore, this article combines ultra-supercritical units with integrated energy systems and proposes three solutions. Firstly, mathematical modeling of various equipment is performed. Secondly, carbon tax is taken into account when optimizing the equipment capacity of the integrated energy system. Finally, the heuristic algorithm in the Gurobi solver is used to find the optimal solution, and the three proposed solutions are evaluated using economic efficiency and carbon emissions as indicators. The results show that the proposed scheme can meet diversified energy needs. The scheme of adding gas boilers and absorption heat pumps has the lowest total annual cost. The scheme of adding gas boilers, absorption heat pumps, electric energy storage, thermal energy storage, and cold energy storage devices has the lowest total annual cost. Annual carbon dioxide emissions are minimal. Compared with the initial plan, the annual total cost of the optimal plan can be reduced by 27.93 million yuan, and the annual carbon dioxide emissions can be reduced by 106,500 tons.

I. Introduction

In the context of “carbon neutrality and carbon peaking”, relying solely on traditional coal-fired power generation can-not meet the power system's demand for low-carbon and environmental protection, and integrated energy systems have proven to be an effective solution to meet current needs [1]. IES integrates electricity, natural gas, and heating and cooling systems, replacing a single energy system in the form of traditional energy supply. It is an effective method to solve the problems of low energy efficiency and coupling of various energy sources [2]–[3]. Integrated energy system (IES) optimizes energy conversion, distribution, storage and other links [4], ef-fectively reducing the consumption of traditional fossil energy and reducing carbon emissions. USC units are an important energy supply subject, combining the two not only meets the multi-energy needs brought about by the rapid development of cities, but also improves energy efficiency and reduces carbon emissions.