计及差异化能量惯性的电–热–气综合能源系统日前优化调度

Day-ahead Optimal Scheduling for Integrated Power,Heat and Gas Energy System Considering Differentiation Energy Inertia

针对不同能源系统的多元异质性,建立了兼顾热力系统源–网–荷以及气网管道差异化能量惯性的电–热–气综合能源系统优化调度方法。首先,针对热惯性展开研究,为克服热传输延时连续性和调度时段离散化的矛盾,提出一种基于流量分段法的热网传输惯性模型,并将该方法引入热源侧的模型构建,进而结合负荷侧的建筑热惯性,共同构建了考虑源–网–荷多种热惯性的热力系统模型。其次,为刻画天然气网络气惯性的动态特征,利用虚拟节点构建稳态模型代替原有的暂态模型,避免了偏微分方程的直接求解,大福降低了计算的难度。最后,基于不同能量惯性全面精确的建模,并综合考虑了各子系统的网络约束和耦合约束,以系统运行成本最小为目标构建了电–热–气综合能源系统日前优化调度模型,并用混合整数线性规划(mixed integer linear programming,MILP)软件进行求解。结合具体算例,研究结果表明精细刻画热、气系统的差异化能量惯性,能够提高电–热–气综合能源系统运行的经济性和灵活性。

Aiming at the multiple heterogeneity of different energy systems,an optimal scheduling method of integrated power,heat and gas energy system is established,which takes into account the differential energy inertia of the thermal system and gas network.Firstly,The thermal inertia is studied:in order to overcome the contradiction between the continuity of heat transmission delay and the discretization of scheduling times,a heat transmission inertia model based on the flow segmentation method is proposed.This method is introduced into the heat source side model construction,and then combined with the building thermal inertia of the load side,a thermal system model considering multiple thermal inertia of source-network-load is constructed.Secondly,in order to describe the dynamic characteristics of gas inertia in the natural gas network,a steady-state model is constructed by using fictitious nodes instead of the original transient model,avoiding the direct solution of the partial differential equations,which greatly reduces the difficulty of calculation.Finally,based on the comprehensive and accurate modeling of different energy inertia,and considering the network constraints and coupling constraints of each subsystem,the day ahead optimal scheduling model of the integrated power,heat and gas energy system is constructed with the objective of minimizing the system operation costs.The model is solved by the mixed integer linear programming(MILP)software.Combined with a specific example,the research results show that the economy and flexibility of the integrated power,heat and gas energy system can be improved with the fine depiction of the differential energy inertia of the integrated power,heat and gas energy system.