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电网技术  2015 

一种改进三角变换的频率检测新方法

DOI: 10.13335/j.1000-3673.pst.2015.02.041, PP. 563-567

Keywords: d-q变换,Kalman滤波,相位时间曲线,频率补偿,量值检测

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Abstract:

在电网频率波动时,采用d-q变换法和Kalman滤波法难以准确检测出电压骤降特征值。为解决此难题,以Matlab7.6为实验平台进行了大量的仿真和数据分析,并通过原理推导,发现当电网实际频率与算法中变换矩阵的预置频率不一致时,信号的相位时间曲线不再是一条平行于时间轴的直线,而是呈一次函数关系的斜线,并且随着频率的偏差变化,一次函数曲线的斜率也会相应增大或减小。在此基础上首次推导出相位时间曲线斜率k1与频率偏差值Δf之间的数学关系式。将该方法与常规Kalman滤波法和d-q变换法相结合,能够对被测信号实时跟踪,当被测信号频率变化时,能快速准确检测信号频率波动变化时的幅值和相位。该方法在信号的量值检测中具有广阔的应用前景。

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