采用加窗插值算法的谐波分析仪的DSP实现  

Design of Harmonic Analysis Instrument Based on DSP with Window Interpolation Algorithm

作　　者：陈倩[1] 张全法[1] 李宏成[1] 费光彦[1] 

机构地区：[1]郑州大学物理工程学院,郑州450001

出　　处：《电测与仪表》2013年第6期120-123,共4页Electrical Measurement & Instrumentation

摘　　要：采用快速傅里叶变换进行三相电力系统谐波分析时,由于采样不同步和非整数周期截取,容易造成频谱泄露和栅栏效应,从而严重影响谐波分析的精度。虽然通过加窗和插值修正可以大大提高谐波分析精度,但是算法复杂,实时性难以保证。为此,设计了一种基于DSP的三相电力系统谐波分析仪,并采用加海明窗与双峰谱线插值修正的方法实时地进行谐波分析。仿真试验表明,具有实时性好、谐波分析精度高的特点。Performing harmonic analysis for three-phase power system with the fast Fourier transform,asynchronous sampling and non-integer period interception will cause spectral leakage and picket fence effect,which will seriously affect the accuracy of the harmonic analysis.By the interpolation correction with a window function,the accuracy can be improved greatly,but it is very complex and difficult to make sure in real-time.For this reason,this paper proposes a design of three-phase power system harmonic analysis instrument based on DSP,which can make possible of real-time double peak interpolation correction with the Hamming window.Simulations demonstrate that the instrument can do harmonic analysis in real-time and has high accuracy.

关 键 词：谐波分析 DSP 窗函数 插值修正 快速傅里叶变换 

分 类 号：TM933[电气工程—电力电子与电力传动]