气网动态潮流下多能源网与能量枢纽的联合调度

Coordinated dispatch of multi-energy network and energy hubs considering dynamic natural gas flow

天然气系统与电力系统的时间响应特性之间存在显著差异,若在综合能源系统优化调度模型中进一步融入天然气系统动态潮流模型,则能够更精确地描述其实际运行状态。为此,建立了考虑气网动态过程的电力-天然气耦合系统,该系统基于能量枢纽相耦合,并在能量枢纽中引入考虑负荷特性的需求响应模型,提出了考虑需求响应的多能源网与能量枢纽的联合优化调度方法。通过对网络模型与能量枢纽模型进行线性化处理来降低模型复杂度,并采用分解求解法进行多能流潮流计算。以含有2个能量枢纽的综合能源系统为算例进行仿真分析,结果表明考虑气网动态潮流的模型能更准确地描述实际运行状态,且考虑需求响应对于降低峰谷差、提高经济效益效果显著。

There are significant differences of the time response characteristics between the natural gas system and the power system. The dynamic natural gas flow model can accurately describe the operation conditions of a natural gas system,and hence should be considered in the operation model of an integrated energy system. In this regard,an integrated electricity and natural gas system considering the dynamics of natural gas network is developed,and the system is coupled based on the energy hubs. Meanwhile,the demand response model considering the load characteristics is introduced into the energy hub. Then,a coordinated optimal dispatching method of multi-energy network and energy hub considering demand response is proposed. By linearizing the network model and energy hub model to reduce the model complexity,and a decomposition approach is used to calculate the multi-energy flow. Simulative results on an integrated energy system with two energy hubs are obtained. The results show that the model considering dynamic natural gas flow provides more realistic operating conditions,and considering demand response effectively reduces the peak-valley difference and improves economic benefits.