电-热互联综合能源系统区间潮流计算方法

由于电力网络与热力网络耦合逐步加深,有必要研究电-热互联综合能源系统的安全分析与评估。考虑到电-热负荷波动的不确定性,提出一种电-热互联综合能源系统区间潮流计算方法,以定量评估不确定因素对系统运行状态的影响。首先推导和建立了管道压降方程的等值函数;然后提出一种基于线性优化的区间潮流方法,通过变量代换得到迭代初值,并采用优化方法求出各状态变量的上/下限。进一步的,考虑到实际负荷很难同时达到上限或下限,引入负荷不确定预算概念,可有效克服区间潮流的保守性。算例结果验证了所提区间线性规划方法的有效性。

Interval Energy Flow Calculation Method of Integrated Electro-Thermal System

It is necessary to conduct safety analysis and assessment for integrated electro-thermal systems as a result of an increased coupling between the two energy systems.An interval energy flow analysis is proposed for the integrated energy system considering uncertainties of both electricity and thermal demands.The proposed approach provides quantitative evaluation of the impacts of uncertainties on system operation conditions.Firstly,the equivalent function of pipeline pressure drop equation is deduced and established.Then,an interval energy flow analysis approach is proposed based on linearized power and heat flow models.An initial value of iteration is obtained by variable substitution and the upper and lower bounds of each state variable are obtained using linear optimization model.Furthermore,the concept of load uncertainty budget is introduced considering the fact that the demands cannot simultaneously reach their upper or lower bounds,contributing to a less conservative interval solution.Test results verify effectiveness of the proposed interval energy flow model using linear programming.