系统电磁暂态仿真中大型感应电机不同暂态模型对比研究  

Comparison of Different Transient Models of Large Induction Motors in Electromagnetic Transient Simulation of Power Systems

作　　者：康锦萍[1] 杨广亮 杜三恩 吴国旸 许国瑞[1] 赵海森[1] KANG Jinping;YANG Guangliang;DU Sanen;WU Guoyang;XU Guorui;ZHAO Haisen(School of Electrical and Electronic Engineering,North China Electric Power University,Changping District,Beijing 102206,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China)

机构地区：[1]华北电力大学电气与电子工程学院,北京市昌平区102206 [2]中国电力科学研究院有限公司,北京市海淀区100192

出　　处：《中国电机工程学报》2022年第15期5697-5705,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51977077)。

摘　　要：在新型电力系统电磁暂态仿真时,作为系统中主要负荷的感应电机暂态模型是否准确将直接影响仿真精度,如何在保证计算精度的前提下合理选择电机暂态模型及求解算法成为当前系统仿真面临的关键难题。该文依据经典电机理论,在dq0坐标系下建立计及集肤效应的电磁、机电及机械暂态模型。针对常用的隐式欧拉、隐式梯形、三级Runge-Kutta及四阶Runge-Kutta这4种算法,对比分别采用小步长和大步长求解断电重合闸及起动这2种暂态过程时的仿真精度及计算效率,确定不同求解算法的适用条件。同时提出一种改进梯形法,较好地解决机械暂态模型大步长仿真时易出现的数值振荡问题。以一台电厂给水泵用11200kW感应电机为例,对比研究起动过程中用不同暂态模型求得的定子电流、转速及电磁转矩特性,并对其产生的原因进行分析。通过与现场实测起动电流对比,验证分析结果的正确性。In the transient simulation of new power systems,the accuracy of the transient model of induction motor,which is the main load in the system,will directly affect the simulation accuracy.How to reasonably select the transient model of induction motor and the algorithm under the premise of accuracy becomes a challenge in current system simulation.Based on the classical motor theory,the electromagnetic,electromechanical and mechanical transient models with skin effect were established in dq0 coordinate.Furthermore,aiming at the commonly used implicit Euler algorithm,implicit trapezoid algorithm,three-stage Runge-Kutta algorithm and four-order Runge-Kutta algorithm,the simulation accuracy and calculation efficiency with small steps and large steps to solve two transient processes of power-off re-switching and starting were compared,and the applicable conditions of different algorithms were concluded.Meanwhile,an improved trapezoidal method was proposed to solve the numerical oscillation problem of mechanical transient model in large step simulation.With a 11200kW feed pump induction motor in a power plant,the dynamic characteristics of stator current,speed and torque solved by different models during starting process were calculated.The correctness of the simulated results was verified by comparing to the measured stator current during the starting process in field.

关 键 词：电磁暂态仿真 感应电机 暂态模型 RUNGE-KUTTA 

分 类 号：TM346[电气工程—电机]