适用于发展性故障的故障分量提取算法

提出了适用于发展性故障的故障分量提取算法。该算法首先计算发展性故障发生前保护安装处的故障分量，再根据发展性故障发生前保护安装处的电流和获取的故障分量求得非故障状态网络中的支路电流;发生发展性故障后，利用保护安装处的全电流减去求得的支路电流得到发展性故障后的故障分量电流。该算法不受电网参数波动和负荷变化的影响。在IEEE 9节点系统模型基础上，BPA仿真验证了算法的正确性。

Extraction Approach of Fault Superimposed Components in Evolved Fault

An extraction approach of fault superimposed components in an evolved fault is proposed. Based on the superimposed theory of linear systems, a fault power system can be broken down into a normal system network and a fault superimposed system network. This approach firstly calculates fault superimposed components before the evolved fault occurred at the measuring point. Then by subtracting the calculated currents fault superimposed components from the currents of the moment at the measuring point, load currents in the normal system network is obtained. After an evolved fault occurred, the fault superimposed components can be calculated through subtracting the solved load currents from the currents at the measuring point. The proposed approach is free of influences of load and network parameters, etc. The digital simulation in the IEEE 9-bus system model verifies the applicability of the approach.