利用铭牌参数的感应电动机低穿能力评估  

Evaluation of the induction motor’s low crossing capability using nameplate parameters

作　　者：孟庆伟[1] 赵莹 高涵 MENG Qing-wei;ZHAO Ying;GAO Han(College of New Energy,China University of Petroleum(Huadong),Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)新能源学院,山东青岛266580

出　　处：《电机与控制学报》2020年第11期127-134,共8页Electric Machines and Control

基　　金：山东省重点研发计划(2019GGX103045);中央高校基本科研业务费专项资金资助(18CX02113A);含高比例电力电子化设备的负荷建模技术及应用研究(XTB17201900064)。

摘　　要：针对指导电动机选型、电压暂降治理、保护整定、进行暂降事故损失评估、划分事故责任等问题,通过理论推导加仿真验证的方式,提出了一种基于感应电动机铭牌参数的低电压穿越能力的评估方法。选择安全临界电压和暂降临界切除时间为电动机低电压穿越能力的特征值。利用感应电动机转差-电压-转矩关系,分析暂降前和暂降中电动机运动规律,明确其稳定运行的界限。基于铭牌参数对临界转差率和临界转差率和相应电压下的最大转矩进行估算,分别推导出恒功率、恒转矩以及风机、泵类负载下安全临界电压和暂降临界切除时间的不同表达。利用软件进行仿真模型的搭建,并通过分析算例中的安全临界电压、临界转差率与暂降临界切除时间,验证了所提方法的有效性。Aiming at the problems of guiding motor selection,voltage sag resolution,protection setting,sag accident loss assessment and accident liability division,through the theoretical derivation and simulation verification,this paper proposes an assessment method of the low voltage ride through(LVRT)based on the parameters of the induction motor nameplate.Safe critical voltage and voltage sag critical clearing time(CCT)was used to represent the LVRT ability for the motor in this paper.By using induction motor slip-voltage-torque relations,the motion law of the motor before and during sag and the limits of its stable operation were achieved.Based on the nameplate parameters,the critical slip and the maximum torque under the corresponding voltage were estimated,and the expressions of the safety critical voltage and the transient cutoff time under the constant power,constant torque,fan and pump loads were derived respectively.In this paper,the software was used to build the simulation model.The effectiveness of the proposed method is verified by analyzing the safety critical voltage,critical slip and transient advent cut time in the example.

关 键 词：低电压穿越能力 安全临界电压 暂降临界切除时间 电动机铭牌参数 电压暂降 临界转差率 

分 类 号：TM346[电气工程—电机]