基于变量自适应分组的电力系统多速率仿真算法

Multi-rate method for power system simulation based on self-adaptive variable grouping

提出一种用于电力系统稳定性仿真的多速率方法,能够在仿真过程中自适应地给出具有较高加速比的变量分组方式,避免了传统的多速率仿真方法为进行变量分组而需要预先给定分组步长比的困难。构建了不诚实牛顿法(VDHN)的分组求解算法,包括预测、插值和校正3个环节,并针对VDHN法的特点给出了校正过程中电压分组计算的方法。采用IEEE 118节点系统,通过比较所提方法、采用给定步长比进行变量分组的多速率仿真方法以及单速率仿真方法,验证了所提方法的正确性和计算效率,并证明了所提自适应分组方法优于传统的预先给定步长比的分组方法。

A multi-rate simulation method is proposed for power system stability analysis,which adaptively groups the variables with higher speed-up ratio to avoid the grouping step ratio setting in traditional multi-rate simulation methods. The VDHN（Very DisHonest Newton） method is adjusted to solve the grouped variables,including three steps：prediction,interpolation and correction,for which the ealeulative method for solving the grouped bus-voltage variables in correction process is presented. The comparison among the proposed method,multi-rate method with given grouping step ratio and single-rate method shows the superiority of the proposed method in accuracy and efficiency for IEEE 118-bus system.