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提出了基于故障相与非故障相电压凹陷矩阵解决单相对地短路故障电压凹陷域的确定方法。利用网络正序、负序、零序阻抗矩阵,建立故障相与非故障相电压凹陷矩阵,从而得到网络任一节点凹陷域的准确描述。确定了非故障相发生电压凹陷的条件,并针对不对称短路故障的特点,考虑了变压器不同绕组方式对电压凹陷传递的影响。由凹陷矩阵提供的信息还能比较网络不同节点发生短路时对其余节点产生的凹陷幅值。最后以IEEE14节点系统作为算例进行仿真分析,仿真结果证明了所提算法的有效性。
A method of determining the sag of single-phase short-circuit fault voltage based on faulty phase and non-fault phase voltage sag matrix is proposed. By using the network positive sequence, negative sequence and zero sequence impedance matrix, the fault sag and non-fault phase voltage sag matrix are established, and an accurate depiction of the sag domain of any node in the network is obtained. The condition of voltage sag in non-fault phase is determined. Considering the characteristics of asymmetrical short-circuit fault, the influence of different winding modes of transformer on voltage sag transmission is considered. The information provided by the depression matrix can also compare the magnitude of the depression to the remaining nodes when different nodes of the network are short-circuited. Finally, the IEEE 14-bus system is used as an example to simulate and analyze the results. The simulation results prove the effectiveness of the proposed algorithm.