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考虑铁损的电动汽车用异步电机转子时间常数在线辨识方案

, PP. 146-152

Keywords: 矢量控制,铁损,转子时间常数,模型参考自适应

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Abstract:

针对异步电机磁场定向矢量控制技术,从铁损离线辨识和转子时间常数在线辨识两个方面对异步电机控制性能进行优化。通过标准空载实验和工程实测数据测定计算出不同工况下的铁损等值电阻值,包括定转子铁损,并推导出铁损等值电阻随频率和转差率变化的函数关系。在此基础上对传统矢量控制进行改进,设计了包含铁损补偿模块的矢量控制系统。采用基于转子q轴磁链的模型参考自适应法,实现转子时间常数在线辨识,以q轴转子磁链是否等于零作为参考依据,在控制器内设置的转子时间参数初始值基础上在线调整其值来提高转子磁场定向角的准确性。仿真实验结果证明了该方案可准确补偿铁损和转子时间常数,有效提高了控制系统的动态和稳态性能。

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