基于电压脆弱性的支路事故排序快速算法

Fast algorithm of branch contingency ranking based on voltage vulnerability

提出一种基于电压脆弱性的支路事故排序快速算法。用线性灵敏度法快速得到各事故后的临界电压,根据静态能量与注入功率和节点电压的关系引出静态能量裕度的定义,提出两个可用于事故筛选与排序的电压脆弱性评估指标。其中局部指标计算事故后系统稳定运行时各节点能量裕度,并取最薄弱节点的值作为系统的能量裕度;整体指标取事故后系统稳定运行的总能量得到的能量裕度。由这两个指标分别对事故进行筛选与排序,得到严重事故集。对IEEE30、IEEE57母线系统的仿真结果与采用内点法精确计算的排序结果对比验证该思路的有效性。

A fast algorithm of contingency ranking based on voltage vulnerability is proposed. The critical value in post-fault system is fast gotten by linear sensitivity. Then the definition of static energy margin is elicited based on the relations of static energy with power injection and bus voltage, and two indices for evaluating voltage vulnerability in contingency screening and ranking are proposed, one of which is local index, and the other one is whole index. The local index calculates the energy margins of nodes under contingency on stable operation, and takes the value of the weakest node as the energy margin of system. The whole index is the energy margin of total energy under contingency on stable operation. The critical contingencies can be gained after contingency screening and ranking based on the two indices. The effectiveness of the proposed method is demonstrated through comparing with interior point method on IEEE30- and IEEE57-bus system.