电能数据采集用户终端谐波分析及计量改进方法

Harmonic analysis and measurement improvement method for electric energy data acquisition user terminal

智能电表是目前最具应用前景的电能数据采集用户终端。为了改善电网谐波污染,提升电能质量。首先采用快速傅里叶变换计算了谐波分析的运算效率,提出了复序列分裂基谐波分析方法,提高了谐波分析的运算效率。采用基于三角自卷积窗的电能计量改进方法对频域特性进行仿真分析。研究表明:基于三角自卷积窗的电能计量方法对有功功率的计量精度明显高于典型的窗函数,比Nuttall窗函数的计量精度高1~2个数量级。

The smart meter is the electric energy data acquisition terminal users which are currently the most promising. In order to improve power grid harmonic pollution and power quality, fast Fourier transform （FFT） was used to calculate the harmonic analysis of operation efficiency. And then complex sequence division based harmonic analysis method was proposed, which improve the operation efficiency of harmonic analysis. The improvement method of electric energy measurement based on triangular self- convolution window is proposed, and the simulation results are compared. The research shows that the measurement accuracy of active power was significantly higher than that of typical window function based on the power measurement method of triangular self-convolution window. The measurement accuracy of the triangular self-convolution window is 1-2 orders of magnitude higher than that of Nuttall window.