综合能源系统控制自由度指标及其对经济调度的影响

Control Freedom Index of Integrated Energy System and ItsImpact on Economic Dispatch

综合能源系统通过多能流耦合转化,向用户提供多样化的能源供给服务。相比传统的独立供能系统,综合能源系统具有更大的控制自由度。针对如何衡量系统的控制自由度这一问题,首先提出了表征多能流相互转换能力的可转换性指标,以及表征用户侧选择能源空间的可替代性指标,并给出了这两个指标的计算方法。其次,考虑控制自由度对于综合能源系统优化运行的影响,建立了冷-热-电-气综合能源系统的经济调度模型。最后对算例进行仿真分析,结果证明提高综合能源系统的可转换性和可替代性两个控制自由度指标可以降低系统的经济调度成本。

Integrated energy system(IES)provides users with diversified energy supply services through the coupling conversion of multiple energy flows.Compared with conventional independent energy supply systems,the IES has greater degree of control freedom.In order to measure the degree of control freedom,this paper firstly proposes a convertibility index to characterize the mutual conversion ability of multiple energy flows,and a substitutability index to represents selection opportunities for alternative energy at the user side.In addition,the calculation methods for the convertibility index and the substitutability index are provided.Secondly,considering the influence of control freedom on the optimal operation of the IES,an economic dispatch model of the cooling-heating-power-gas IES is established.Finally,a case simulation is carried out,and the results shows that improving the two control freedom indexes of the convertibility and substitutability of the integrated energy system can reduce the economic dispatch cost of the system.