计及电转气耦合的电-气互联系统机组组合线性模型研究

针对电-气互联系统,考虑电转气技术和燃气轮机的双向耦合,研究其机组组合问题。以全系统综合运行成本最低为目标,考虑电力系统和天然气系统多种安全约束,建立电-气互联系统机组组合模型,并对其进行线性化得到线性模型。选取某6节点电力系统与10节点天然气系统耦合的电-气互联系统为例,分别计算非线性模型与线性化模型并比较其求解效率。同时分析了计及电转气和不计及电转气两种场景下系统运行成本和运行状态。仿真结果表明线性模型提高了电-气互联系统机组组合求解效率,电转气的应用也有助于提高电-气混联系统的经济性。

Linear model research of unit commitment for integrated electricity and natural-gas systems considering power-to-gas coupling

This paper presents unit commitment model for integrated electric and natural-gas systems considering two-way coupling of power-to-gas and gas turbine. Minimizing the sum of integrated energy systems operation costs becomes the objective function. The security transmission constraints of the natural-gas and electricity networks are considered simultaneously. Linearization method is adopted to get the linear model. The test case consists of the 6-node electric network, the 10-node gas network and the coupling elements. The nonlinear model and the linearized model are calculated respectively and their solving efficiency is compared. The two scenarios with or without power-to-gas on system operational states and cost are analyzed simultaneously. Test results show that the linear model improves the solving efficiency of the unit commitment of the integrated electric and natural-gas systems. And the power-to-gas could effectively improve the operation economy and reliability of integrated electric and natural-gas systems. This work is supported by National Natural Science Foundation of China (No. 51877071) and Science and Technology Project of State Grid Jiangsu Electric Power Company Ltd (No. J2019017).