基于电压曲线特征的电压暂降凹陷域快速计算

Fast Calculation of Voltage Sag Vulnerable Area Based on Voltage Curve Characteristics

针对现有的电压暂降凹陷域计算方法进行了分析研究,提出一种基于敏感负荷节点电压曲线特征的凹陷域快速计算方法。当线路发生单相接地故障时,分析敏感负荷节点电压的表达式,在此基础上定义了由节点阻抗矩阵元素组成的一致性参数和单调性参数,用来判断电压曲线是否具有单调性。根据电压曲线单调与否,把线路分为两类,采用不同的临界故障点计算方法。以IEEE 39节点标准测试系统为例,分析敏感负荷节点的凹陷域。并与已有的解析式法对比,结果表明,该算法在保证精确度的前提下提高了计算速度。

The calculation method of existing voltage sag vulnerable area is analyzed and studied and a kind of fast calculation method of the vulnerable area based on voltage curve characteristics of the sensitive load node is proposed.In case of single-phase ground fault on the line,the expression of the sensitive load node voltage is analyzed.On this basis,the consistency parameter and the monotonic parameter,which are composed of the elements of the node impedance matrix,is defined to determine whether the voltage curve is monotonic.The lines are divided into two types in accordance with whether the voltage curve is monotonic or not and different critical fault point calculation methods are used.The IEEE 39-node standard test system is taken as an example to analyze the vulnerable area of sensitive load nodes.The result,compared with the existing analytical methods,shows that the algorithm improves the calculation speed while ensuring the accuracy.