【摘要】 为实现复杂工业现场的电能准确计量,提出了基于小波包分解与重构算法的谐波电能计量方法,介绍了小波包的分解与重构算法和基于该算法的谐波信号提取方法,给出了谐波功率计算式与谐波电能计量原理;利用db42小波函数进行谐波电能计量仿真分析,仿真信号的基波频率为50Hz,采用2层小波包变换,取40个基波周期内的仿真输入信号,采样频率fs为800Hz,稳态、非稳态谐波有功电能与谐波无功电能计量仿真实验结果证明了算法的可行性与准确性;在此基础上研制的基于虚拟仪器技术的三相谐波电能计量装置实现了各次谐波有功电能、无功电能计量,准确度达0.2S级,符合GB/T14549—1993的A类标准要求。更多还原

【Abstract】 To realize high-accuracy measurement of harmonic energy in complicated industry field,a kind of harmonic energy measurement method based on wavelet packet decomposition and reconstruction algorithm is presented. The wavelet packet decomposition and reconstruction algorithm and the extraction method of harmonic signal based on this algorithm are introduced. The calculation expression of harmonic power and the principle of harmonic energy measurement are listed. The simulation analysis of harmonic energy measurement use db42 wavelet function,50Hz as fundamental frequency,2-layer wavelet packet transform,simulation input signal about forty fundamental periods and 800Hz for sampling. The simulation results of active energy and reactive energy of harmonic in steady or unsteady state demonstrate feasibility and accuracy of this algorithm. Three-phase harmonic energy measurement device based on VI technology developed on the basis of this algorithm realizes active energy and reactive energy measurement of each time harmonic. The accuracy class of fundamental energy measurement is up to 0.2S and the harmonic energy measurement fulfills the accuracy requirements of the A class harmonic measurement.更多还原