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电网技术  2011 

基于前馈神经网络的基波高精度检测

, PP. 124-128

Keywords: 电网基波,前馈神经网络,基波频率,基波幅值

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Abstract:

电网基波是电能计量和电能质量评估的重要指标,提出了基于前馈神经网络的电网基波频率和幅值的高精度检测方法。根据数学推导得出正弦信号过零点与其两侧对称两点的连线与时间轴交点的时间差,同频率满足单调关系,但并非严格的线性关系,而且与幅值无关,据此用前馈神经网络建立该时间差与频率的映射关系。Matlab仿真表明,提出的算法对频率的检测精度达到10-4级,幅值的检测精度高达10-5级,远远高于快速傅里叶变换和Hanning窗的插值算法;随机噪声和谐波对前馈神经网络测量精度的影响很小,该算法具有较强的抗干扰能力。

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