计及拓扑结构和运行状态的支路重要度评估方法

Assessment Method of Branch Importance Considering Topological Structure and Operation State

准确快速地识别出关键支路,对于提高电网运行的稳定性及防止大停电事故的发生具有重要意义。文中将复杂网络理论和熵理论有机结合,从结构和状态两个角度对支路重要性进行综合评估。首先,提出计及传输裕度率的有功输电介数指标,以衡量支路的传输能力及其在电网拓扑结构中的重要度;然后,提出基于改进潮流转移熵的冲击性指标,以量化支路开断对系统造成的潮流冲击;最后,建立了包括有功输电介数和冲击性指标的支路综合重要度评估指标,以充分衡量支路在电网中的重要性。利用IEEE 39节点系统进行仿真,其仿真结果证明了该方法有效且合理。

In order to improve the stability of power grid operation and prevent large scale power blackouts,identifying crucial branches in power systems accurately and quickly is of great significance.The theories of complex network and entropy are integrated to evaluate the branch importance from the overall perspectives of structure and running state.Firstly,the index of active power transmission betweenness considering the transmission margin rate is proposed to measure the branch transmission capability and its importance in the topological structure of the power grid.Then,the index of impact based on improved transfer entropy of power flow is proposed to evaluate the power flow impact on the power system caused by branch outages.Finally,an assessment index of synthetical importance of branches is set up to fully measure the importance of branches,including indices of active power transmission betweenness and impact.The test on an IEEE 39-bus system demonstrates the method proposed is valid and rational.