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基于遗传算法优化的定子磁链扩展卡尔曼估计方法

, PP. 64-70

Keywords: 磁链估计,扩展卡尔曼滤波器,直接转矩控制,遗传算法

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Abstract:

定子磁链估计的精度直接关系到异步电机直接转矩控制(DTC)的控制效果,本文提出了一种基于扩展卡尔曼滤波器(EKF)的定子磁链观测方法,该方法选取DTC反馈通道中多个主要参数作为状态变量进行联合滤波估计,为保证EKF算法滤波参数的准确性,采用遗传算法(GA)对EKF中的系统噪声矩阵和测量噪声矩阵进行了优化处理。通过使用该方法设计的磁链观测器与DTC构成闭环系统进行仿真实验表明,滤波参数优化后的EKF算法更加有效地提高了磁链估计精度,从而提高DTC系统的低速控制性能。

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