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基于强跟踪滤波器的电压暂降检测

DOI: 10.13336/j.1003-6520.hve.2015.10.037, PP. 3454-3463

Keywords: 电压暂降,强跟踪滤波器,动态电压恢复器,渐消因子,频率偏移,直流偏移

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Abstract:

快速精确地检测电压暂降特征量包括暂降幅值、起止时刻和相位跳变是电压暂降补偿的前提。提出了基于强跟踪滤波器的电压暂降检测方法,在考虑谐波、频率偏移、直流偏移、非整次谐波和噪声影响的基础上,建立了含有直流分量、基波和谐波分量的10阶强跟踪滤波模型;采用低阶强跟踪滤波器的渐消因子检测突变,实验表明该方法对弱突变也有较好的检测效果;采用高阶强跟踪滤波器检测暂降幅值和相位跳变。合成信号的仿真表明其动态响应特性优于普通Kalman滤波和虚拟三相dq变换法,动作时间小于0.2ms,幅值误差小于0.009%,相位误差小于0.7o;较小的过程噪声协方差阵Q和较大的观测噪声协方差阵R使算法受非整次谐波的影响小;在频率偏移、直流偏移时也能得到准确的暂降特征量,在此点上优于时变Kalman滤波法。实测暂降信号的仿真表明所提方法能用于实际暂降信号,算法有望改善动态电压恢复器在扰动时的实时补偿效果。

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