基于改进的卡尔曼滤波电压骤降检测方法  

Method of Voltage Sag Detection Based on Improved Kaman Filter

作　　者：王海元[1] 李开成[1] 李燕平[1] 何顺帆[1] 李辰[1] 张晓康[2] 

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]河南省电力公司洛阳供电局,河南洛阳471000

出　　处：《电测与仪表》2012年第10期9-13,共5页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(5107708);国家支撑计划资助项目(2008BAC36B02)

摘　　要：为了准确检测电压骤降,提出了一种基于改进的Kalman滤波电压骤降检测方法。当频率波动大,影响到电压特征量的检测时,该方法通过对状态变量的相位曲线求斜率来得到频率校正量,对状态转移矩阵进行频率校正,来保持参数追踪的准确性。本文以MATLAB7.6为实验平台进行仿真分析,分析结果表明即使在有频率偏移、谐波影响和噪声干扰的情况下仍然能够准确检测电压骤降的骤降幅值、起止时刻以及相位跳变,具有较强的鲁棒性。In order to detect the voltage sag accurately, this paper proposes a new method based on improved Kalman filter. When the frequency fluctuation is large enough to influence the detection of voltage characteristics, this method gets the frequency correction by calculating the slope of phase curve of state variables, then Corrects the state transition matrix to get accurate tracking results. Experimental platform is MATLAB7.6, and the simulation results show that even in the case of frequency offset, harmonics and noise. This method can also exactly detect the voltage sag characteristics （sag amplitude, starting and ending time and angle jump）, has strong robustness.

关 键 词：电压骤降 频率校正 KALMAN滤波 相位跳变 

分 类 号：TM933[电气工程—电力电子与电力传动]