基于概率密度函数的对称电压凹陷预测方法  

Prediction Method for Symmetric Voltage Sag Based on Probability Density Function

作　　者：曾智[1] 杨洪耕[1] 

机构地区：[1]四川大学电气信息学院,四川成都610065

出　　处：《四川电力技术》2008年第2期72-74,94,共4页Sichuan Electric Power Technology

摘　　要：提出了基于对线路上故障概率密度函数积分的方法,从而对系统网络中发生三相对称短路故障时所关心节点的电压凹陷幅值和一定时间内的发生频次这两个特征量进行预测,并由此对电压凹陷在网络中的传递进行分析。再根据系统网络的阻抗矩阵Z,建立网络对应的电压凹陷矩阵,并由电压凹陷矩阵提供的信息,从而减小在网络中需要计算的线路数。最后以一个实际系统作为算例进行了计算和分析,仿真结果证明了上述算法的有效性和优越性。A new analytical method for predicting the features of the balanced voltage sags is proposod. The features include the mag- nitude and the frequency of the balanced voltage sags. Based on this method, the transfer of the voltage sag in HV networks can be analyzed. Furthermore, according to the impedance matrix of positive sequence, voltage sag matrix can be easily established. Based on the information of the voltage sag matrix, the number of the lines which should be calculated can be decreased. Finally taking a real system for example, the simulation results show the effectiveness and the significant advantage of this method.

关 键 词：故障概率密度函数 电压凹陷 电能质量 

分 类 号：TM732[电气工程—电力系统及自动化]