县城电网全黑风险分析及防控措施

Analysis and Preventive Measures of Blackout Risks in County Power Grids

县城电网一旦发生全黑,不仅会造成较大的经济、社会影响,还可能威胁互联电网的安全稳定运行。本文通过分析某一实际县城电网的内、外部电源结构及运行方式,得出该县城电网为典型的单一供电电源的地区电网、在某些N-1故障下存在全黑风险的结论,针对可能导致县城电网全黑的预想故障,从加强设备运维、运行方式调整、电网规划建设等方面提出防控措施。其中,对于能立即化解县城电网全黑风险的运行方式调整措施,详细分析比较了3种调整方案的优劣,可视电网实际运行情况灵活采用。本文的研究成果对于类似结构的县城电网防范电力安全事故、提高供电可靠性具有参考意义。

Once the county power grid is completely black,it will not only cause great economic and social impact,but also threaten the secure and stable operation of the interconnected power grid.In this paper,the internal and external power supply structure and operation mode of an actual county power grid are analyzed.It is concluded that the county power grid is a typical regional power grid with single power supply source and there are blackout risks under certain N-1 faults.Aimed at coping with the envisaged faults that may lead to the blackout of the county power grid,prevention and control measures are proposed in terms of the strengthening of equipment operation and maintenance,the operation mode adjustment,and the power grid planning and construction.Among them,with regard to the operation mode adjustment measures that can immediately eliminate the blackout risk of the county power grid,the advantages and disadvantages of the three adjustment schemes which can be flexibly adopted according to the actual operation of the power grid are analyzed and compared in detail.The research results of this paper can serve as a reference for county power grids with similar structures to prevent power security accidents and improve power supply reliability.