求取电压稳定分歧点的改进步长连续潮流法  

Improved Continuation Method with Controlled Step Size for the Solution of Voltage Stability Bifurcation

作　　者：贺泳华[1] 刘光晔[1] 高磊 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082 [2]西北电网西安输变电运行公司,西安710065

出　　处：《电力系统及其自动化学报》2012年第5期112-116,共5页Proceedings of the CSU-EPSA

摘　　要：连续潮流法是求取电压稳定分歧点的一种有效方法,但现有方法计算量大。为此,提出一种改进步长连续潮流法,先对线性电路的戴维南等值原理进行广义扩充,证明了非线性电力系统传输最大功率条件是:戴维南动态等值阻抗模等于负荷静态等值阻抗模。并根据戴维南动态等值阻抗引导的负荷阻抗变化初步预测极限功率,以此作为连续潮流计算的步长选择依据,实现变步长连续潮流计算。对IEEE118系统进行仿真计算,结果表明该算法能既快速又准确地找到电压稳定分歧点。Continuation power flow algorithms are effective for obtaining the voltage stability bifurcation, but the calculation scale of existing methods is large. An improved continuation power flow method with controlled step size which predicts limit power flow is presented. First it extends Thevenin equivalent theory in linear circuit. It is proved that the maximum power transmission in power system is in a necessary condition： Thevenin dynamic equivalent impedance modul should be equal to the load equivalent impedance modul. This algorithm uses predicted limit power flow based on the load impedance change lead by Thevein dynamic equivalent impedance to adjusts step size automatically, which can be proved accurately and effectively to obtain the voltage stability bifurcation in IEEE 118 standard system.

关 键 词：电压稳定极限点 广义戴维南等值原理 连续潮流 步长控制 静态电压稳定 

分 类 号：TM71[电气工程—电力系统及自动化]