基于小干扰分析的电力系统电压稳定研究

Study on Power System Voltage Stability Based on Small Distrubance Analysis

介绍小干扰分析电力系统电压稳定的基本原理和电力系统静态电压崩溃极限点的概念;其次,介绍了考虑SVC的小干扰电压稳定分析的数学模型及其方法;最后,基于上述模型和方法对IEEE3机9节点和2机四节点进行算例分析,在具体分析时对比了不含SVC和含SVC的系统的小干扰电压稳定性,验证了SVC对静态电压稳定的作用;对比分析了系统正常运行状态下和在静态电压临界点的小干扰稳定情况;通过计算系统各个模态的参与因子,得到了对系统小干扰稳定性有重要作用的状态变量;通过计算各节点电压失稳系数,得到系统的小干扰电压稳定的薄弱节点。上述研究验证了SVC对提高电压稳定具有重要作用,参与因子和失稳系数能为确定电压稳定的薄弱环节提供一定的判断依据。

The basal principle of the power system voltage stability of the small distrubance analysis and the concept of the static voltage breakdown limit point of the power system are presented.Secondly,the mathematical model of the small distrubance voltage stability analysis of SVC and the method are also presented.Finally,for the above-mentioned the model and method,the calculating examples to IEEE 3G9 nodes and 2G4 nodes are analyzed.For the concrete analysis contrast the small distrubance voltage stability without SVC and with SVC systems,verifying SVC to affect of the stati voltage stability.The small distrubance stable condition under normal operating state and static voltage critical point are compared and analyzed.By calculating the particpative factor of each modality of the system,get the state variable that has an important action to the small distrubance stability of the system.By calculating the voltage unstability coefficient of each node,get the weak node of the small distrubance stability of the system.The study above mentioned has verified that SVC has an important action to increasing the voltage stability.The participative factor and the unstability coefficient can offer certain judement basises to set the weak link of the voltage stability.