电网技术Issue(2)：509-514,6.DOI:10.13335/j.1000-3673.pst.2014.02.036
感应电动机对称电压跌落临界清除时间解析算法
An Analytical Method to Calculate Critical Clearance Time of Symmetrical Voltage Sags for Induction Motors
王志军 1朱珂 1王小宇2
作者信息
- 1. 山东大学电气工程学院，山东省济南市 250061
- 2. 卡尔顿大学电子工程系，加拿大渥太华 K1S 5B6
- 折叠
摘要
Abstract
In allusion to induction motor stalling due to protection actions easily triggered by voltage sags, an analytical algorithm to fast calculate the critical clearance time of symmetrical voltage sags for induction motors is proposed. Based on the concept of intersection points of stable equilibrium and unstable equilibrium between electromagnetic torque-slip curve and mechanical torque-slip curve of induction motor and the steady state equivalent circuit of induction motor, the first-order differential motion equation of the motor is turn into an analytical time-slip function. Besides, an algorithm to judge whether the symmetrical voltage sag is absolutely safe is put forward. The effectiveness of the proposed method is validated by the results of electromagnetic transient simulations. The proposed analytical algorithm contributes to implement the intelligent protection for induction motors and decrease the probability of unnecessary stalling of induction motors.关键词
对称电压跌落/临界清除时间/感应电动机/绝对安全电压跌落Key words
symmetrical voltage sags/critical clearance time/induction motors/absolutely safe voltage sags分类
信息技术与安全科学引用本文复制引用
王志军,朱珂,王小宇..感应电动机对称电压跌落临界清除时间解析算法[J].电网技术,2014,(2):509-514,6.
