基于自适应陷波滤波器的基波与谐波有功功率分别计量

ANF-based Fundamental-frequency and Harmonic Active Power Respective Measurement

非线性负荷的广泛应用使电网遭受严重的谐波污染,如何准确、合理计量谐波条件下的功率和电能已成为电气测量技术及仪器仪表领域急需解决的问题。电能计量的关键是有功功率的准确计量,文中在单相瞬时功率理论的基础上,提出了基于自适应陷波滤波器的谐波条件下单相基波和各次谐波有功功率分别计量新方法。采用自适应陷波滤波器分别提取出单相电压、电流各自含有的基波和各次谐波分量以及各分量的正交分量,然后通过单相瞬时功率理论分别计量基波和各次谐波有功功率。仿真和实验结果表明,所提出的有功功率计量新方法具有较高的计量精度,尤其是在电网频率变化时,不需要额外的测频或同步采样,仍能快速、准确计量基波和各次谐波有功功率。

The wide use of non-linear loads causes significant harmonics pollution to the electrical network.How to measure electric power accurately and electric energy reasonably in the presence of harmonics has become an urgent problem in the research field of electrical measurement technologies and instruments.The key to the electric energy measurement is accurately measuring the active power.In this paper,an adaptive notch filter（ANF）-based fundamental-frequency and harmonic active power respective measurement method is proposed on the basis of the single-phase instantaneous power theory.The fundamental-frequency,each order harmonic and their orthogonal components of the single-phase voltage and current are separately extracted by ANF,and then fundamental-frequency and each order harmonic active power are calculated respectively according to the single-phase instantaneous power theory.Simulation and experiment results indicate that the new active power measurement method proposed in this paper has high level metering accuracy.Particularly when the power frequency varies,this method is still able to measure the fundamental-frequency and each order harmonic active power correctly and fast without additional frequency measurement and synchronous sampling.