摘要
针对三相对称正序电压的仿真计算模型无法准确模拟感应电动机负荷动态特性的问题,提出一种计及不对称故障影响的感应电动机负荷模型解析算法。首先,基于转子一阶机械暂态方程获取感应电动机的转差率,再开展各项运算分析以获取扰动后感应电动机的电流变化和功率响应;然后,从电压稳定性和参数可辨识性角度,比较三阶机电暂态模型和一阶机械暂态模型的精度;最后,基于PSCAD/EMTDC平台搭建模型,对不同故障电压跌落场景下感应电动机的动态响应进行仿真分析。仿真结果表明,所提的解析算法能够获得不对称故障影响下感应电动机的动态响应且具有计算准确性和快速性的优势。
Aimed at the problem that the simulation calculation model of three-phase symmetrical positive-sequence voltage cannot accurately simulate the dynamic characteristics of induction motor load,an analytical algorithm for an in-duction motor load model which takes into account the influence of asymmetric faults is proposed.First,the slip rate of induction motor is obtained based on the 1st-order mechanical transient equation of the rotor,and calculations and anal-ysis are performed to obtain the current change and power response of induction motor after disturbance.Then,from the perspective of voltage stability and parameter identifiability,the accuracy is compared between the 3rd-order electrome-chanical transient model and 1st-order mechanical transient model.Finally,a model is established based on the PSCAD/EMTDC platform to simulate the dynamic response of induction motor under different fault voltage sags.Simula-tion results show that the proposed analytical algorithm can obtain the dynamic response of induction motor under the in-fluence of asymmetric faults,and it also has advantages of calculation accuracy and rapidity.
作者
郭宁
李程昊
范延赫
马俊先
刘明洋
GUO Ning;LI Chenghao;FAN Yanhe;MA Junxian;LIU Mingyang(State Grid Ningxia Electric Power Co.,Ltd,Yinchuan 750010,China;Electric Power Research Institute,State Grid Henan Electric Power Company,Zhengzhou 450052,China;School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;Economic and Technological Research Institute,State Grid Ningxia Electric Power Co.,Ltd,Yinchuan 750002,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2023年第10期79-86,共8页
Proceedings of the CSU-EPSA
基金
国家电网有限公司总部管理科技项目(5100-202055439A-0-0-00,电力电子化电力系统短路电流计算方法深化研究与应用)。
