Online identification method of a key transmission section considering multi-faults

被引：0
作者：
Zhou T. [1 ]
Dai Y. [2 ]
Xu W. [2 ]
Ren X. [2 ]
Liu L. [1 ]
机构：
[1] State Grid Jiangsu Electric Power Co., Ltd., Nanjing
[2] NARI Group Corporation/State Grid Electric Power Research Institute, Nanjing
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2021年 / 49卷 / 04期
关键词：
Line tripping distribution factor; Multi-fault; Overload line; Thermal stability margin; Transmission section;
D O I：
10.19783/j.cnki.pspc.200612
中图分类号：
学科分类号：
摘要：
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. © 2021 Power System Protection and Control Press.
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页码：45 / 53
页数：8
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