A High-Precision and Wideband Fundamental Frequency Measurement Method for Synchronous Sampling Used in the Power Analyzer

Frontiers in Energy Research

Renjun He¹  Yifan Wang²  Xuan Gou²  Sheng Yang²  Gen Qiu²  Kai Chen²  Wenjian Zhou² 

[1] AVIC Chengdu Aircraft Design and Research Institute, Chengdu, China;School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, China;

关键词: fundamental frequency;    spectrum refinement;    FFT;    particle swarm optimization;    synchronous sampling;    power quality analyzer;   

DOI  :  10.3389/fenrg.2021.652386

来源: DOAJ

【 摘 要 】

In the dedicated high-precision power quality analyzer, synchronous sampling is required to reduce the effect of spectrum leakage produced by the discrete Fourier transform process. Thus, accurate fundamental frequency measurement is urgently needed. However, due to the harmonics and noise in the power signal, it is difficult to achieve the accurate fundamental frequency measurement. Moreover, with the wide application of high-frequency programmable power supply, the fundamental frequency is gradually increasing, which requires power analyzers to have the abilities of both high precision and a wide range of the fundamental frequency measurement. To solve these issues, a new fundamental frequency measurement architecture used in synchronous sampling is proposed. This architecture consists of a small-point fast Fourier transform module, spectrum refinement algorithm, and a multimodal optimization method to calculate the accurate fundamental frequency under large harmonic conditions. In the practical hardware platform results, this architecture has a large fundamental frequency measurement range from 20 Hz to 200 kHz with a relative error which is <0.004%. The wideband fundamental frequency measurement structure proposed in this article achieves high measurement accuracy.

【 授权许可】

Unknown