同步采样和谐波分析方法的实现

Implementation of Synchronous Sampling and Harmonics Analysis Method

为了减小因非同步采样和非整数次周期截断造成的影响,提高电力系统谐波分析的精度,本文简述了一种基于DSP的电力系统谐波分析装置的总体结构。在讨论了非同步采样造成的栅栏效应误差之后,提出了同步采样的实现方法。为减小频谱泄露的影响,采用加窗双峰谱线插值的FFT算法分析电力系统谐波,并对算法的实现进行了详细的描述,仿真结果显示选择合适的窗函数可以提高电力系统谐波分析精度。最后将该算法移植在DSP上。

To reduce disturbance by non-synchronous sampling and non-integral period truncation,and to improve the accuracy of harmonics analysis,a framework of the power harmonics analyzer based on DSP is introduced in this paper.After discussing the error of the fence effect by non-synchronous sampling,its implementation method is briefly put forward.In order to reduce the impact of the spectrum leakage,FFT algorithm based on window function and double peak of spectral lines interpolation is used to analyze the harmonic of power systems.The implementation of the algorithm is described in detail.The simulation results have showed that the accuracy of harmonics analysis is improved by selecting the fit window function.Finally the algorithm is applied on DSP.