电力网络快速计算的符号分析方法

Symbolic Analysis Method for Real-time Calculation in Electric Power Grids

提出了一种运用符号函数对电力网络进行快速计算的全新方法.该方法直接将电力网络元件的参数进行符号表达,通过求解网络的k-树,有效地计算出电力网络节点电压方程中各变量的符号表达式.并采用k-树分解的重用技术,在网络结构或运行参数发生局部变化后,对原有的计算结果作局部调整和修改,就可获得网络改变后的解,从而有效地提高了计算效率.

An efficient method, named symbolic analysis method, for the real-time calculation of electric power systems was developed. It used symbol to express circuit element＇s parameters and solved the k-trees of the network ,therefore, the symbolic expression of node voltage variables in Node Matrix Equation can be evaluated. Technique of re-usage of k-tree decomposition, which significantly reduces the computation of solving Node Matrix Equation when the structure of electric power grid or element parameters are changed, is also presented. Comparing with compensating method, the method is more fast and effective and is prone to be programed. Simulation results show the method is valid and feasi- ble.