大电网可靠性影响分析的潮流跟踪方法

Power Flow Tracing Method for Impact Analysis of Large Scale Power Grid's Reliability

提出了大电网可靠性评估中削减负荷的潮流跟踪模型, 建立了节点和系统可靠性对元件的分配计算模型,基于此易于分析系统的薄弱环节。在负荷削减的潮流跟踪模型中,按负荷对发电机和线路利用系数的大小顺序削减负荷。基于潮流跟踪削减负荷能建立故障元件与削减负荷节点间的映射关系,该模型的核心在于找出所有元件中对削减负荷节点利用系数最大的元件。算例结果证明了所提出方法的有效性。

A power flow tracing based load shedding model for reliability evaluation of large scale power grid is proposed and a calculation model for distribution of reliability indices of bus and system to components is built, on this basis the weak links of power grid can be easily found out. In the proposed power flow tracing based load shedding model, the londs are shedded according to the sequence of factor values by which the loads utilize generators and transmission lines. In light of load shedding based on power flow tracing, the mapping relation between faulty components and the load shedding buses can be established. The core of the proposed model lies in finding out such a component, which possesses maximal contributing factor to load shedding buses, from whole components. The calculation results show that the proposed model is effective.