摘要
快速傅里叶变换(FFT)在电力系统谐波检测中被广泛应用。由于电网频率的波动,很难做到严格意义上的同步采样,导致频谱泄漏与栅栏效应现象发生,造成较大的测量误差。本文从传统的FFT检测方法出发,深入研究了加汉宁窗并进行插值运算的高精度算法。仿真时利用Labview所提供的Matlab节点将两款软件进行高效有机结合,以精确检测出各次谐波频率、幅值和相位,为进一步构建基于虚拟仪器的谐波检测系统打下基础。
Fast Fourier transform （FFT） has been widely used in harmonic detection of power system. Because of fluctuating of the grid frequency, it is difficult to synchronize sampling in a striet sense, and can result in measuring errors with spectrum leakage and picketfence effect phenomena. Based on traditional FFT detection, high precision algorithm combineing with harming window and interpolation operation is studied in depth. Matlab node provided by Labview is used in simulation, and the cooperative work is effective. The harmonic frequency, amplitude and phase are detected precisely, and it lays a foundation for further building virtual-instrument -based harmonic detection system.
出处
《自动化与仪器仪表》
2011年第5期159-161,共3页
Automation & Instrumentation
基金
西南交通大学峨嵋校区科技发展基金项目(KJFZ-20100109)
