考虑不对称故障影响的感应电动机负荷动态特性快速解析算法  

Fast Analytical Method for Calculating the Dynamic Performance of Induction-Motor Loads Considering the Effect of Asymmetrical Fault

作　　者：廖卫平 张艳 冯佳伟 方涛 苏珏 Liao Weiping;Zhang Yan;Feng Jiawei;Fang Tao;Su Jue(Jiangmen Power Supply Bureau Guangdong Power Grid Co.Ltd,Jiangmen 529000 China)

机构地区：[1]广东电网有限责任公司江门供电局,江门529000

出　　处：《电工技术学报》2020年第19期4183-4193,共11页Transactions of China Electrotechnical Society

摘　　要：感应电动机负荷的动态特性对电力系统电压稳定性有重要的影响。为快速评估不对称故障后感应电动机的动态响应特性并避免繁琐的时域仿真计算,基于电路和电机分析理论,提出一种计算电力系统不对称故障电压跌落下感应电动机动态特性的快速解析算法。该解析算法先求解转子一阶机械暂态方程,得到扰动后转子的转速和转差率变化。在此基础上,求解转子相量形式的暂态电动势微分方程,得到暂态电动势的变化。最后,准确获得扰动后感应电动机的电流和功率响应。该解析算法在感应电动机负荷三阶机电暂态模型基础上稍加修改即可实现。将解析算法计算结果与PSCAD/EMTDC电磁暂态仿真结果进行比较,证明了该解析算法的有效性。将解析算法应用于求解电力系统综合负荷的动态响应特性,表明其具有应用于电力系统稳定性分析的潜力。The dynamic performance of induction motorloads has an important influence on power system voltage stability.To assess theirpost-asymmetrical fault transient response quicklyand avoid tedious time-domain simulation,fastanalyticalmethod to calculate the dynamicperformance of induction motors following power system voltage sag after asymmetrical and symmetrical fault is proposedbased on circuit and machine analysis theory.Firstly,the first-order mechanical transient equation of the rotor is solved and the rotor’s speed and slip variations after disturbance are obtained.Based on this,the rotor’sphasor-form transient electric potential differential-equation is solved,and the change of the transient potential is attained.In the end,the current and the power response of the perturbed motor are acquired.This analytical method can easily be used in the Third-order electromechanical transient model of induction motor loads.Compared with PSCAD/EMTDC electromagnetic transient simulation results,the effectiveness of the algorithm is proved.Application of the proposed method to calculate the dynamic response of power system composite load demonstrates its utilization potential in power system stability studies.

关 键 词：感应电动机 动态特性 不对称故障 电压跌落 解析算法 

分 类 号：TM744[电气工程—电力系统及自动化]