参数不对称电网故障计算的虚拟端口法  

Fictitious Port Method for Parameter Unbalance Power System Fault Calculation

作　　者：蒋建东[1] 魏臻珠[1] 王晓华[2] 

机构地区：[1]郑州大学电气工程学院,郑州450001 [2]濮阳供电公司,濮阳457000

出　　处：《电工技术学报》2010年第12期161-166,共6页Transactions of China Electrotechnical Society

基　　金：河南省高校青年骨干教师资助项目

摘　　要：通过引入虚拟支路和虚拟节点,构造出模拟参数不对称和故障的虚拟端口,以虚拟端口为边界,将故障后的参数不对称电网分解成无故障对称网络和模拟参数不对称及故障的网络两部分。根据线性电路的基本理论,建立了参数不对称电网故障分析计算模型,提出了在序坐标系下进行参数不对称电网故障计算的虚拟端口法。该方法具有如下特点:通过电网参数不对称的模拟,将参数不对称电网化为参数对称电网,故障计算中可以充分利用电网中占绝大多数的对称元件在序坐标系下可以解耦的优点;电网参数不对称和故障的模拟方法统一,模拟电网参数不对称和故障的网络结构简单,构成方法规律性强,易于实现;模拟电网参数不对称和故障的端口参数计算方法一致,可由处理后的对称电网节点阻抗参数得到,计算效率高。文中最后以一个不对称电网故障为例进行了计算。In this paper,by introducing the fictitious branch and fictitious node,the fictitious ports to simulate the parameter unbalance and fault are established.By taking fictitious ports as boundary,the faulted parameter unbalance power system is separated into symmetrical network and unsymmetrical network to simulate parameter unbalance and fault.Based on the basic theory of liner circuit,the model for parameter unbalance power system fault calculation is built,and the fictitious port method for parameter unbalance power system fault calculation in sequence domain is presented.The method has the following characteristics：By parameter unbalance simulation,the parameter unbalance power system is transformed to symmetrical network,so the characteristic that symmetrical component can be uncoupled is employed.The parameter unbalance and fault simulation method is united.The simulation network is simple and easy to be implemented using computer.The paramter calculation of fictitious port for simulation the parameter unbalance and fault is same and can be deduced from the balance node paramter.The paramter calculation is efficient.In the end an unsymmetrical power system with a short to earth fault is analyzed as an example.

关 键 词：电网 参数不对称 故障计算 虚拟端口 

分 类 号：TM744[电气工程—电力系统及自动化]