谐波在线预测系统的研制

基于“虚拟仪器”的概念，引入快速抗混迭傅里叶变换方法，用分段积分的方法取代快速傅里叶变换中离散序列求和方法进行复频谱系数的数值计算，提高了谐波测量精度并降低了硬件成本。提出一种自适应自回归(ADAR)预测模型，可根据谐波过程特性变化自适应调整自回归预测模型的参数乃至结构。描述了其预测方程，介绍了电力谐波在线分析预测系统的功能结构及软件设计。该系统能实时测量谐波，并可对设定次数谐波的未来状况作出在线短期预测。

Development of on-line power harmonics analysis and prediction system

Based on the concept of virtual apparatus,the FAFT(Fast Anti-aliasing Fourier Transform)method is applied,which calculates the complex spectrum coefficient by phase integration instead of summing up the discrete sequence,used in fast Fourier transform. The harmonic measuring pre-cision is thus enhanced and the hardware cost is lowered. ADAR(ADaptive AR) predicting model is presented,whose parameters and exponent number can be adaptively tuned according to the characteristic variation of harmonic. Its predicting equations are described,and the functions and software design of the on-line power harmonics analysis and prediction system are offered. It can real-timely measure harmonics and make an on-line short-term prediction for the preset harmonics.