动态信号参数及有功功率的小波包计算方法

摘要

针对电力系统中广泛存在的非平稳信号,基于两种基本动态信号模型,采用小波包法将电压、电流进行正交小波包分解,利用分解系数计算动态信号的有效值、总有功功率及各子带有功功率.数值仿真实验表明:论文方法可用于计算动态信号的参数和有功功率,精度可达10-4,充分体现了小波包法的实用性.%Aimed at the widespread non-stationary signal in the power system, based on the two basic dynamic signalmodels, the paper uses wavelet packet method to decompose voltage signal and current signal orthogonally. RMS ofvoltage and current, total active power and active power in each sub-band can be calculated by decomposition coefficient.Numerical simulation results show that the method proposed in the paper can be used to calculate parameters and activepower of dynamic signal, the calculation precision can reach 10-4, fully embodies the practicability of wavelet packetmethod.