【摘要】 介绍谐波测试系统的结构,详细论述了谐波测量的原理及其实现。针对由于非同步采样而引起的频谱泄漏问题,应用基于DFT校正算法来减小误差,并仿真估计了非同步采样时本算法的谐波幅值、相位测量误差情况。仿真与实验表明,该算法实时性好、测量精度高;采用LabVIEW开发的谐波测试系统功能齐全、成本低且开发维护方便。更多还原

【Abstract】 The structure of harmonic measurement system is introduced firstly,and the principle of harmonic measurement as well as the key technique of harmonic measurement is detailed.The measuring algorithm based on DFT spectrum correction is used to reduce the errors caused by frequency spectrum leakage which is brought by asynchronous sampling.The measuring errors of amplitude and phase of harmonic are analyzed in detail.Simulation and application show that the approach is suitable for real time implementation and gives good accuracy.The system of harmonic measurement based on LabVIEW is fully functional,low cost and maintain conveniently.更多还原