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.
出处
《电工技术学报》
EI
CSCD
北大核心
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
关键词
电网
参数不对称
故障计算
虚拟端口
Power system
parameter unbalance
fault calculation
fictitious port
