摘要
谐波与基波有功、无功电流的正确检测是谐波拟制和无功补偿的基础。本文利用小波变换的多分辨分析理论,结合电网电流定义式,给出一种简便的计算基波电流的有功分量、无功分量与谐波分量的算法,无需预先求解电流相位,计算量小,适合在线计算。利用不同类型的小波,在不同采样频率下对算法进行了实例仿真,仿真结果证明了该算法的有效性,并讨论了小波滤波器系数长度及采样频率对算法检测精度的影响。
Accurate detection of harmonic and fundamental active and reactive current is the basis for harmonic elimination and reactive power compensation. This paper provides a simple method for calculating fundamental active and reactive current by using wavelet multi-resolution analysis and definition of current. It is not necessary to calculate current phase in the whole of calculation, which has advantages of small computational amount and fitting for online computation.The instance simulation is implemented with different wavelet and different sample frequency. The influence of factor length of wavelet filter and sample frequency on the detection precision are discussed. The simulation results show that the method is effective.
出处
《水电能源科学》
北大核心
2013年第4期215-218,共4页
Water Resources and Power
关键词
谐波
有功电流
无功电流
小波变换
harmonic
active current
reactive current
wavelet transform
