摘要
本文深入分析了正交小波包的原理和最优小波包基的选取方法,首次提出了基于最优小波包的电压、电流有效值及有功功率的分频带测量算法,该算法可自适应划分频带,并完成基波和谐波有功功率的测量。本文通过采用db40小波进行仿真实验,可看出基于最优小波包的电压、电流有效值及有功功率分频带测量算法是可行的,其电压、电流有效值及有功功率在总频带上的相对误差小于6×10-5,有功功率在各子频带测量的引用误差小于8.3×10-5。
The principle of orthogonal wavelet packet transform and selection of optimum wavelet packet basis were deeply analyzed, and then a novel sub-band RMS and active power measurement algorithm based on optimum wavelet packet transform was proposed, which can be used to divide the band into sub-bands adaptively and to measure active powers of fundamental and harmonics. The computer simulation experiment using db40 wavelets shows that the proposed algorithm is feasible, and the measurement relative error of RMS voltage, RMS current and active power is less than 6 ×10^-5 on the whole band, the measurement fiducial error of active power is less than 8.3×10^-5on the sub-band.
出处
《电子测量与仪器学报》
CSCD
2008年第4期30-33,共4页
Journal of Electronic Measurement and Instrumentation
关键词
最优小波包
功率测量
有效值测量
optimum wavelet packet, power measurement, RMS measurement.
