基于提升小波包变换的谐波电能计量

Harmonic energy measurement based on lifting wavelet packet transform

为了克服加窗插值傅里叶算法无法准确计量非稳态谐波的缺陷,实现同时对电力系统稳态、非稳态信号的谐波电能进行准确计量,提出了基于提升小波包变换的谐波电能计量方案,详细阐述了其原理,提升分解、重构步骤。给出了整数次谐波、非整数次谐波功率计算公式,并通过仿真实验证明了该方法的准确性、可行性。对该算法进行优化,并进行DSP算法仿真实验,并估算该算法运行时占用空间大小及耗费时间,结果表明该算法能有效节省内存空间及运行时间。

In order to overcome the defects carded out by the windowed interpolation Fourier algorithm which can＇t accurately measure unsteady harmonic and realize accurate measurement of the power system steady and unsteady signals harmonic energy, a kind of harmonic energy measurement method was presented based on lifting wavelet packet transform. The principle and the steps of the lifting decomposition and reconstruction were discussed. The integer and non-integer harmonics power calculation formulas were given. The accuracy and feasibility of this method were proved by simulation experiment. The algorithm was optimized and DSP algorithm simulation was conducted. The size of the space and time-consuming were estimated when the algorithm was running. The results show that the algorithm can effectively save memory and running time.