基于复杂网络理论的输电线路脆弱度评估方法

Transmission Lines’ Vulnerability Assessment Based on Complex Network Theory

为快速评估线路故障对系统静态安全的影响,基于复杂网络脆弱度理论,构建了互补性脆弱度指标集和综合脆弱度指标,进而提出一种输电线路脆弱度评估方法。该方法可从全局和局部、有功和无功两方面综合衡量输电线路的脆弱度。根据电力网络有功功率传输的特点构建了平均传输距离指标,从全局的角度衡量输电线路故障对有功功率全网传输效率的影响;其次,提出了局部变化量指标,从负荷节点和发电机节点的角度有效评估局部无功平衡受影响的程度。上述两类指标构成了互补性脆弱度指标集。对互补性指标集进行了归一化处理,得到综合脆弱度指标。通过对IEEE30节点系统的仿真分析,验证了所提出的互补性指标集和评估方法的有效性。

To quickly evaluate power system static stability under single branch contingency, based on vulnerability theory of complex network, a complementary vulnerability index set and an integrated vulnerability index are presented to assess the vulnerability of transmission branches under edge attacking from the aspect of active power and reactive power using global and local indexes. The complementary index set is composed of the global and local indexes. Firstly, a global index, the average transmission distance, is introduced to estimate the active power transmitting efficiency. Secondly, the local variation indexes are proposed to estimate the reactive power balances of power systems. The integrated vulnerability index is defined as the weighted sum of the complementary index set. Simulation results on IEEE 30 testing system indicate the effectiveness of the proposed vulnerability assessment method.