一种识别电力系统关键输电线路的方法

电网关键输电线路的辨别有利于预防电网灾难事故,提高电力系统的安全稳定性。通过评估支路开断后系统潮流所受冲击的强弱,给出一种识别电力系统关键输电线路的方法。首先,基于等相角线理论,定义相角分割区,依据相角分割区和电气距离对系统输电线路进行分区,基于广义熵指数理论,定义潮流增长率广义熵指数指标,评估支路开断后潮流冲击分布的均衡度;然后,从网络拓扑结构的角度,定义边的Katz-Bonacich中心性指标评估输电线路位置的重要性,并定义评估系统对潮流冲击抵抗能力的余度指标;最后,基于云模型原理,对各评估指标进行云模型转换,以云图的形式展现评估结果。通过对IEEE 30节点系统和新英格兰10机39节点系统进行仿真,验证了所提方法的正确性。

Identification method of key transmission lines in power system

The identification of key transmission lines is helpful to prevent power grid disasters and im prove the safety and stability of power system.An identification method of key transmission lines in power system is presented by evaluating the impact of power flow after branch outage.Firstly,the phase angle segmentation area is defined based on the theory of equal phase angle line,and the transmission lines are partitioned according to the phase angle segmentation area and electrical distance.Based on the generali-zed entropy index theory,the generalized entropy index of power flow growth rate is defined to evaluate the distribution equilibrium degree of power flow impact after branch outage.Then,from the perspective of network topology structure,the Katz-Bonacich centrality index of the edge is defined to evaluate the impor tance of transmission line location,and the redundancy index is also defined to evaluate the system’s resis tance ability to power flow impact.Finally,based on the principle of cloud model,the evaluation indexes are transformed into cloud model,and the evaluation results are presented in the form of cloud map.The IEEE 30-bus system and New England 10-machine 39-bus system are simulated,and the results verify the correctness of the proposed method.