摘要
为了实时准确地检测实际电力系统的谐波电流信号,提出了一种基于αβ变换和自适应卡尔曼滤波的任意次谐波电流检测方法。该方法首先对三相电流信号进行归一化处理,然后通过αβ变换将含有谐波和噪声的三相不对称电流信号分解为两个互相垂直的αβ分量,建立含有基波和谐波正负序分量的卡尔曼滤波状态方程,通过改变状态方程的参数可以实现任意指定次谐波的检测。最后利用卡尔曼滤波算法快速准确地检测三相不平衡电流信号的基波分量和任意次谐波分量。通过自适应修正系统噪声方差阵Q,降低模型误差并有效抑制滤波发散现象。MATLAB仿真结果证明了该方法的有效性。
In order to accurately detect real-time harmonic current signals in real power system, a random harmonic current detection method is proposed based on αβ transform and adaptive Kalman filter. The three-phase current signal is normalized and the three-phase asymmetry current with harmonic and noise signals is divided into two mutually perpendicular aft component through αβ transform, in order to establish the state equation of Kalman filter, which has plus and minus sequence components of fundamental and harmonic current. It can detect any appointed harmonic by changing the parameters in the state equation. Kalman filtering algorithm is used to quickly and accurately detect the fundamental component and random harmonic component of unbalanced three-phase current. System noise matrix Q is auto-adapted in order to reduce model error and restrain the radiation of hormonics. Results of MATLAB simulation prove the effectiveness of the method.
出处
《现代电力》
2008年第4期45-49,共5页
Modern Electric Power
关键词
ΑΒ变换
卡尔曼滤波
谐波检测
有源滤波
电能质量
αβ transform
Kalman filter
harmonic detection
active power filter
power quality
作者简介
林呈辉（1983-），男，硕士研究生，研究方向为电能质量分析与控制；
杨洪耕（1949～），男，教授，博士生导师，长期从事电能质量、电力谐波分析与控制方面的研究与教学工作；
袁锋（1982-），男，硕士研究生，研究方向为电能质量分析。
