基于强跟踪滤波器的电压暂降检测  

Voltage Sag Detection Based on Strong Tracking Filter

作　　者：陈晓静[1,2] 李开成[1] 张明[3] 许峰[1] 王可[1] 

机构地区：[1]华中科技大学强电磁工程与新技术国家重点实验室,武汉430074 [2]长江大学电子与信息学院,荆州434023 [3]武汉纺织大学电子信息工程学院,武汉430073

出　　处：《高电压技术》2015年第10期3454-3463,共10页High Voltage Engineering

基　　金：国家自然科学基金(51277080);太阳能高效利用湖北省协同创新中心科研团队培育项目(HBSZD2014001)~~

摘　　要：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0.2 ms,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。The fast and accurate detection of the magnitude, phase angle jump and the time instant of the beginning and end of voltage sags is the premise of sag compensation. We have proposed a new method of detecting voltage sags based on strong tracking filter （STF）. Firstly, a ten order STF model composed of DC, fundamental and harmonic components is founded in which the effect of harmonics, the frequency deviation, DC offset, non-integral harmonics and measurement noise has been taken into account. The fading factor of low order STF model is used to detect the time instant of the be- ginning and end of voltage sags. The experimental results show that this method is suitable not only for detecting deep sags but also for shallow sags. A high order STF model is used to detect the the magnitude and phase angle jump of vol- tage sags. The simulation using the synthetic signals shows this method has faster dynamic response characteristic than Kalman filter method and virtual three phases dq transformation method. The detection time is less than 0.2 ms, the am- plitude error less than 0.0090/0 and phase angle error less than 0.7 degree. It is found that the non-integral harmonics have little influence on this algorithm through selecting the smaller processing noise covariance Q and the larger measurement noise covarianee R. Furthermore, this method has the superiority over the time-varying Kalman filter method since it is immune to frequency deviation and DC offset. The simulation using the real voltage sag event shows the proposed me- thod can be applied in practice. It can be used to improve the DVR real-time compensating effectiveness.

关 键 词：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 

分 类 号：TN713[电子电信—电路与系统] TM714.2[电气工程—电力系统及自动化]