计及频率变化的感应电动机实用模型

频率是电力系统运行中的重要参数,电力系统仿真计算中必须考虑电力设备的频率特性。为此在电动机物理Park模型的基础上,重新定义电动机模型的实用变量,提出了考虑频率变化的电动机新定义3阶实用模型。传统定义3阶实用模型在实际应用中往往忽略了频率的导数项,由此给系统仿真带来了误差;而在新定义3阶实用模型中,实用变量的定义均不包含频率,电动势为磁链的线性关系,在电动势求导过程中不会出现频率的导数项。与传统定义3阶实用模型相比,该新定义3阶实用模型能够在不增加模型阶数的前提下准确考虑频率的影响。通过仿真算例验证了新定义3阶实用模型的准确性和有效性。

Practical Induction Motor Model with Consideration of Frequency Variation

Frequency is an important parameter in power system actual operation,and the frequency characteristic of electric equipment should be considered in digital simulation of power system.On the basis of the induction motor physic circuits and the Park model,we proposed a new induction motor model in consideration of frequency characteristic.In the new definitions of the practical variables of induction motor,the voltages behind the reactance were redefined as a linear equation of flux linkage,thereby,the rotor voltage equation was not relative with the derivative terms of frequency.However,the derivative terms of frequency is always ignored in the application of traditional practical model.Compared with the traditional practical model,the newly-developed practical model could accurately take frequency into account without increasing the model order.The simulation results show the new practical model is accurate and effective.