地区电网计及备自投的N-1静态安全分析快速计算方法

地区电网由于其自身的特点在进行实时N-1分析时通常会引起大量的备自投动作,传统的方法在进行N-1分析时,先对具体的故障进行模拟,然后进行拓扑分析,再进行考虑备自投动作后的拓扑分析。整个过程涉及频繁的开关操作从而要进行大量的拓扑计算。根据地区电网的特点提出了两种考虑备自投的实时N-1计算方法,该方法分别是通过供电路径搜索或预先建立N-1故障与动作的备自投的映射关系,在潮流校核过程中通过负荷转移的方法将负荷从工作母线转移到备用母线来模拟备自投的动作。该方法不需要改变电网的基本拓扑关系,从而大大地缩短了计算时间,现场运行情况表明所提出的方法是可行的,可以更高效地对电网进行N-1分析。

A Fast Computing Method of N-1 in Static Safety Analysis Considering BATS in Regional Power Grid

Many busbar automatic transfer switches (BATSs) will be triggered by N-1 analysis because of their own characteristics of a regional power grid. In the traditional method, a specific failure is simulated first, then the topology analysis is made and finally the topology analysis considering BATS operation is made. The whole process involves frequent switch operation, so a great deal of topology calculation is needed. Two real-time N-1 calculation methods considering BATS are proposed based on the characteristics of the regional power grid. In these methods, BATS operation is simulated by the load transfer method in the flow check process by means of power supply path search or pre-building the mapping relation between N-1 fault and actuating BATS. As the method does not have to change the topology information of the power grid, it can significantly reduce calculating time. Field operation shows that the proposed method is feasible and better able to perform N-1 analysis for the power grid.