基于断开安全裕度状态空间截断的电力系统可靠性算法

在大型电力系统中,由支路断开触发的电力系统相继跳闸故障常会引起大停电的灾难性后果,因此必须进行紧急状态下的事件可靠性分析.通过分析支路断开对系统节点电压及线路负荷的影响,给出一种快速计算紧急状态下系统节点电压和线路负荷的方法,引入系统节点电压和线路负荷安全裕度指标,并提出基于断开安全裕度状态空间截断的电力系统可靠性算法.该算法利用安全裕度指标找出系统故障状态中的关键状态集合,通过对该集合进行系统行为分析来计算可靠性指标.算例表明该算法能有效截断系统状态空间,在一定精度下降低了可靠评估的计算复杂性.

Reliability Evaluation Algorithm of Power Systems Based on Outage Margin of Safety State Space Pruning

In bulk power system,cascading failures initiated by branch outage events often lead to blackouts,it is necessary to carry out the event reliability analysis under emergency state.The influence of branch outages on system node voltage and line load is analyzed and a method can quickly calculate system node voltage and line load method under emergency state is introduced.The safety margin indices of node voltage and line load are also introduced.The reliability evaluation algorithm using state pruning by margin of safety is proposed.The margin of safety indices is applied to get the key states in all system fault states.Reliability indices are calculated by analyzing these key states.Some samples demonstrate its effectiveness and the computational complications of reliability analysis can be reduced. This work is supported by National Natural Science Foundation of China(No.50337010)and Technological Project Cooperated by China Southern Power Grid.