含气网和热网的配电网电压稳定分析

Analysis of Voltage Stability of Distribution Networks Containing Gas and Heating Networks

随着综合能源系统概念的提出,可再生能源的联系越来越紧密。通过燃气轮机将电网、天然气网以及热网耦合形成综合能源系统,分析不同情形下的故障极限切除时间。研究表明,仅接入天然气网的配电网在故障情况下比同时接入热网和气网时具备更强的维持电压稳定的能力,同时提出在综合能源系统中安装动态无功补偿装置,通过分析可得SVC比STATCOM维持暂态电压稳定的能力更强,最后推导出适用于电/气/热综合能源系统的电压降落公式,并通过仿真验证了其准确性。可运用此公式来判断电/气/热综合能源系统的电压稳定性。

Along with introduction of the concept of integrated energy system,connection between renewable energy sources is getting closer and closer.The gas turbine was used to couple the power network,natural gas network and heating network to form an integrated energy system,and critical fault clearing time under different conditions was analyzed.Researches showed that a distribution network with access only to natural gas network was more capable of maintaining voltage stability in case of failure than the network with access to both heating network and gas network.In the meantime,this paper proposed the installation of a dynamic reactive compensator in the integrated energy system.Analysis showed that SVC was more capable of maintaining transient voltage stability than STATCOM.Finally,a voltage drop formula applicable to the integrated energy system of electricity/gas/heat was deduced and its accuracy was verified through simulation.The proposed formula could be used to judge the voltage stability of the integrated energy system of electricity/gas/heat.