继电保护整定计算中故障计算模型的选择和形成

Selection and Formulation of Fault Calculation Model for Power Relay Protection Calculation

故障计算中模型的选择对于提高故障计算速度和准确性,减少内存,扩大网络规模是至关重要的。本文对节点导纳矩阵和节点阻抗矩阵在故障计算中的算法分别进行了比较分析,根据继电保护整定中故障计算的特点,选取节点阻抗矩阵作为故障计算的模型,并详细介绍了节点阻抗矩阵的形成过程,最后以宁夏电网的整定计算为例,验证了在继电保护整定计算选择节点阻抗矩阵作为故障计算模型的快速性和时效性。

In fault calculations, the selection of models is very important for improving calculation speed and accura- cy, reducing the occupation of internal memory and extending network scale. In this paper, the bus admittance ma- trix and the bus impedance matrix are analyzed and compared in their application in fault calculations. According to the characteristic of power relay protection calculation, the bus impedance matrix is selected as the model of the fault calculation, and the detailed formulation process of the matrix is introduced. Finally, the Ningxia power system is taken as an example to testify the efficiency of the selection of bus impedance matrix as the fault calculation model.