摘要
受限于内外部环境影响,电网发生多重故障的概率增加,离线计算确定的关键断面在网架结构受到严重破坏时无法准确反映故障后电网的薄弱环节。为此,提出一种考虑多重故障的热稳关键断面在线识别方法。首先通过故障前后支路负载率变化量和潮流方向一致性判别,识别出故障潮流转移通道。然后依据不同故障的潮流转移特征,建立基于开断分布因子的故障元件和潮流转移通道关联矩阵,筛选出强关联的故障元件和潮流转移通道,构成候选热稳断面。最后采用线性规划的方法计算各候选断面的热稳裕度,将裕度低于门槛值的断面作为热稳关键断面。通过实际电网算例验证了该方法的有效性。
The probability of multi-faults in a power grid can increase because of both the internal and external environment.A key transmission section identified by analysis of typical power system operating modes may not reflect the weakness of the power grid after faults when the grid structure is seriously damaged.Therefore,a key transmission section identification method considering multi-faults is proposed.First,according to variation of branch load rate and consistency discrimination of flow direction,power flow transfer channels of faults are identified.Secondly,based on power flow transfer characteristics of different faults,an incidence matrix of fault elements and power flow transfer channels is constructed by line tripping distribution factors.Candidate key transmission sections consist of fault channels and power flow transfer channels which are strongly relevant.Lastly,the thermal stability margin of each candidate section is calculated by a linear programming method.Sections whose margin is lower than the thermal stability margin threshold are selected as key transmission sections of thermal stability.The effectiveness of the proposed method is verified by a practical power grid example.
作者
周挺
戴玉臣
徐伟
任先成
刘林
ZHOU Ting;DAI Yuchen;XU Wei;REN Xiancheng;LIU Lin(State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210024,China;NARI Group Corporation/State Grid Electric Power Research Institute,Nanjing 211106,China)
出处
《电力系统保护与控制》
CSCD
北大核心
2021年第4期45-53,共9页
Power System Protection and Control
基金
国家重点研发计划项目资助(2018YFB0904500)
国网江苏省电力有限公司科技项目资助(SGJS0000DKJS1900558)。
关键词
输电断面
过载线路
多重故障
开断分布因子
热稳裕度
transmission section
overload line
multi-fault
line tripping distribution factor
thermal stability margin
