新能源接入的受端电网暂态电压失稳高风险故障快速筛选  

A Fast Screening Method for the High-Risk Faults with Transient Voltage Instability in Receiving-End Power Grids Interconnected with New Energy

作　　者：杨金洲 李业成 熊鸿韬 孔贺 薛安成 Yang Jinzhou;Li Yecheng;Xiong Hongtao;Kong He;Xue Ancheng(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Source North China Electric Power University,Beijing 102206 China;State Grid Jining Power Supply Company,Jining 272000 China;State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014 China)

机构地区：[1]新能源电力系统全国重点实验室(华北电力大学),北京102206 [2]国网济宁供电公司,济宁272000 [3]国网浙江省电力公司电力科学研究院,杭州310014

出　　处：《电工技术学报》2024年第21期6746-6758,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51477050)。

摘　　要：大规模新能源接入和外地送电的增加,使得受端电网本地传统发电机无功支撑大大减少,面临暂态电压稳定问题,需要快速筛选出严重故障,以备系统预防控制和安控策略制定。该文提出了基于节点阻抗矩阵的故障点对电网暂态电压影响度指标,可用于快速筛选引发电网暂态电压失稳的关键故障点。首先,介绍了节点阻抗矩阵及其支路追加法;其次,提出反映节点故障对电网暂态电压影响程度的指标,可用于快速筛选高风险关键故障点;再次,结合升阶矩阵给出线路故障点的影响度指标;最后,改进IEEE 39节点系统及某省级电网仿真结果表明,所提指标可以快速筛选出对电网暂态电压影响显著的关键故障点。The receiving-end power grid interconnected with large-scale new energy lack reactive power support from local conventional generators,so that transient voltage stability problems are particularly prominent,easy to cause grid blackout.However,existing transient voltage stability analysis methods are mainly based on time-domain simulations,and most of these methods have large computational volume and high complexity,which are not fast enough to locate the critical fault point in time in the actual power grids.On the other hand,most of the existing studies related to locating critical fault points of power grids utilize graph-theoretic concepts to construct indexes.Although these methods are faster in computation,most of them lack relevant physical meanings,making it difficult to accurately identify the critical fault point of the actual large power grid.In view of this,this paper analyzes the degree of influence of points on the transient voltage stability of the grid based on the weighted topology and transient parameters of the grid,combined with the impedance matrix,in order to quickly screen high-risk fault points.Specifically,firstly,an index reflecting the degree of influence of node faults on the transient voltages of power grid(degree index,also the point influence factor,FAC)is proposed,which can be used for fast screening of high-risk critical fault points;secondly,for the line fault points,an ascending matrix is constructed to calculate their FAC,and the point influence factor array forms a screening method for the whole grid of high-risk critical fault points with high transient voltage instability risk;lastly,the above screening method is applied to the improved IEEE 39 bus test system and the actual receiving-end grid.In the improved IEEE 39-bus system,firstly,the FAC of the bus nodes are calculated,and it is concluded that bus 16 has the highest FAC of 0.3500,and the indexes are compared with the average minimum voltage(UAVL)of the grid under fault and critical clearing time(CCT)to prove its validit

关 键 词：暂态电压 关键故障点 节点阻抗矩阵 支路追加法 

分 类 号：TM712[电气工程—电力系统及自动化]