Distributed robust optimization scheduling of a steel plant integrated energy system considering the uncertainty of byproduct coal gas

Abstract

The steel plant integrated energy system (SPIES) is an important form in the steel industry. Improving the utilization efficiency of steam, electricity, coal gas and other energy flows is of great significance for both economic and environmental benefits. In this paper, a SPIES scheduling model is established according to the operation characteristics of coal gas holders, boilers and other equipment in steel plants. Meanwhile, to cope with the uncertainty of byproduct coal gas, this paper adopts an imprecise Dirichlet model (IDM) to construct a fuzzy set containing multisource coal gas production information. Then, according to duality theory and the big-M method, the original distributed robust optimization (DRO) model is transformed into a traditional mixed integer linear programming (MILP) model, which is solved by the column-and-constraint generation (CC&G) algorithm. Finally, a real steel production system is given in a case study. Case study illustrate that compared with the traditional robust method, the method proposed in this paper for a SPIES can effectively reduce the conservatism of the scheduling decision. Numerical simulation show that the proposed method can reduce total cost by 55,307.1¥, accounting for 1.91% of the total cost compared with robust optimization method and save 1,326.94 s of computational time compared with the stochastic optimization method, thus reaching balance between conservatism and computational efficiency.

Study on the Optimal Configuration of GSHP in Regional Integrated Energy Systems Considering the Uncertainty of New Energy

“…GSHP is one of the important components of the integrated energy system, which uses the earth as a source of cold and heat, uses less power transfer, and provides cold and heat energy to meet load demand [2][3]; GSHP as a key electrothermal coupling component in a regionally integrated energy system, the overall energy utilization efficiency and flexibility of the integrated energy system can be improved [4][5][6]; Through the operation status of the GSHP system in the regionally integrated energy system, a pre-day dispatch model of the regionally integrated energy system containing GSHP and hybrid energy storage is established [7]; And the coupling system of the multi-energy utilization mode of the GSHP is proposed, reduces the gap between supply and demand of the cold, heat and electricity load, and improves the energy utilization efficiency of the integrated energy system [8].…”