文献类型：期刊文献

英文题名：Automatic out-of-step protection of synchronous motor supplied by converter

作者：Wang, Aiyuan[1,2]; Ling, Zhihao[2]

机构：[1] School of Electric Engineering, Shanghai Danji University, Shanghai, China; [2] School of Information Science and Engineering, East China University of Science and Technology, Shanghai, China

年份：2009

卷号：2

起止页码：590

外文期刊名：3rd International Symposium on Intelligent Information Technology Application, IITA 2009

收录：EI(收录号：20101012756797)

语种：英文

外文关键词：Power converters - Surge protection - Electric power factor - Stators - Electric equipment protection

摘要：The paper deals with out-of-step protection of synchronous motor. Synchronous motor supplied by converter works in wide range of speed, and faces disturbance and acute change of load torque. The out-of step is frequently occurs, and damages the motor, affects on related process. The problem can be solved by adjusting supplied voltage according to the calculated load angle. The load angle can not be measured in working condition. But it can be calculated from stator voltage, current, and power factor which can be easily measured. The research discloses the inherent relations among the stator voltage, current, power factor, and load angle using phase graph under steady state adjustable voltage. Based on the relationship of the quantities, it proposes a scheme of automatic out-of-step protection. The scheme bas been simulated on a synchronous motor. The simulation results verify the validity and feasibility of the proposition. ? 2009 IEEE.