论文部分内容阅读
电网脆弱性分析是低频振荡事故监控与预防的重要依据。利用事故链原理，基于电网线路故障、潮流转移、线路相继过载的典型故障模式，构造合理的多重扰动序列，分析电网在多重扰动下的功率振荡情况，研究电网运行方式对其发生等幅、增幅低频振荡的影响，并根据事故链集合与结构重要度指标对电网进行脆弱性分析。结果表明重负荷且易受其他线路潮流影响的线路是电网脆弱性的关键环节，电网交换容量的增加是电网发生等幅、增幅低频振荡的一个重要因素。“,”Vulnerability analysis of power grid is the important basis for low frequency oscillation monitoring, control and prevention. Using the fault chains principle, reasonable multi-disturbances were established based on the typical fault mode of flow transferring and overload of transmission lines caused by line faults. Power oscillation caused by multi-disturbances was researched and the influence of operation modes to the occurrence of low frequency oscillation of equal or increasing amplitude was studied. According to the fault chains set and structural importance index, power grid vulnerability was analyzed. The results show that the heavy duty lines and the lines that are easy to be influenced are the key parts of power grid vulnerability and the increase of power exchange capacity isthe important factor to the occurrence of low frequency oscillation of equal or increasing amplitude.