Abstract
Accurate and complete key transmission section identification has important significance to reduce power system monitoring range and prevent cascading failures. However, key transmission section identified by analysis of typical power system operating modes may not match power grid real-time operation situation when power grid structure is seriously damaged. Therefore, an online identification method of key transmission section considering cross-region faults and security and stability control measures is proposed in order to identify the weak sections that need to be concerned in power grid monitoring. Firstly, power flow distribution characteristics under different faults are analyzed based on results of online static stability analysis. Secondly, power flow transfer channels with different faults are identified and combined into transmission sections for thermal stability. The key transmission sections for thermal stability are screened by power transfer limit and margin calculation. Finally, the effectiveness of the proposed method is demonstrated by Northwest Power Grid.
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