摘要
在计及厂站方式切换、线路检修等多个元件的运行方式同时发生变化时,继电保护整定及故障计算的速度会明显下降。为此文章提出了一种计及厂站方式切换的快速故障计算方法,采用基于节点阻抗矩阵的故障计算模型,通过预先形成不同方式下的厂站单点或两点Π型等值网络参数,将厂站方式的切换转变为等效的简单网络操作。同时结合整定计算的特点,对支路追加顺序和故障计算涉及节点阻抗矩阵元素的修改次数进行了优化,采用了一种分层降阶的涉及节点阻抗矩阵修改方式。算例和实际电网计算结果表明该方法有效减少了阻抗矩阵元素的修改次数,提高了故障计算的速度及大型复杂电网整定计算软件的效率。
The speed of both fault calculation and relay coordination will evidently decrease while the simultaneous variations of operation conditions of multi-components, such as switching of operation conditions of substations or plants as well as line repair, are taken into account. For this reason a fast fault calculation method considering switching of operation conditions of substations or plants is proposed. Adopting fault calculation model based on nodal impedance matrix and by means of preforming equivalent network parameters in the form of single-bus and two-bus Π-type for plants or substations under different operation conditions, the switching of operation conditions of plants or substations can be changed into equivalent simple network operation. At the same time combining the features of relay coordination, the sequence of adding branches and the modification times of elements in nodal impedance matrix related to fault calculation are optimized, and a stratified order-reducing modifying mode of related nodal impedance matrix is used. Results from calculation examples and actual power network calculation show that the proposed method can effective decrease the modification times of elements in impedance matrix and speed up the fault calculation and enhance the efficiency of relay coordination software for large and complicated power grid.
出处
《电网技术》
EI
CSCD
北大核心
2006年第20期46-51,共6页
Power System Technology
关键词
保护整定
故障计算
阻抗矩阵
等值网络
电力系统
relay coordination
fault calculation
impedance matrix
equivalent network
power system
