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电压型逆变器非线性的分析及补偿

, PP. 24-30

Keywords: 电压型逆变器,非线性,误差电压,IGBT非理想特性,磁链估算

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Abstract:

为提高异步电机无速度传感器控制系统中磁链估算的精度,本文分析了死区时间和绝缘栅双极型晶体管(IGBT)非理想特性对电压型逆变器输出误差的影响,得出在母线电压不变的情况下,IGBT关断过程中,输出电压上升下降时间与电流值成反比的结论。结合实验数据,讨论了占空比、开关频率、相电流与误差电压的关系。在此基础上,本文提出了一种新颖的逆变器非线性补偿方法,电流较小时,该方法补偿的误差电压随电流值变化明显。实验证明该补偿方法能够很好地抑制因逆变器误差电压产生的扰动,准确估算电机转子磁链的幅值和相位。

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