基于向量组法的小电流接地故障暂态网络建立

The Transient Network in Non-Solidly Earthed Networks by Vector Groups Method and Principal Components Analysis

以小电流系统单相接地故障为研究对象,针对传统向量法难以应用于暂态过程的问题,提出了以含多频多幅值分量的向量组表示暂态电气量网络,简化暂态过程的计算方法,利用以向量组表示的节点电压方程,消去部分支路节点,添加母线及负载中性点的对地电流,加入部分受控源补偿缺失电压得到新的暂态等值网络;建立的暂态简化网络严格满足暂态方程的约束,具有较高的精度和适用性。

For traditional vector method does not apply in the transient process, a network simplification principle, which express the transient electric parameters in vector groups with multiple frequency and amplitude, is proposed. By the way of eliminating some nodes of node voltage equation and adding the grounding currents of bus and the load neutral point, a simplified transient network is established in which the voltages are compensated by controlled sources. Simulation results show that the simplified transient network has higher accuracy and stronger adaptability comparedwith the traditional one.