Research on the improved FBD harmonic detection method with frequency adaptive algorithm
SHI Liping
SHI Gandong
WEI Bin
SHI Ke
Abstract：To solve the problem of error and delay caused by the phase-locked loop in the traditional FBD detection method,an improved FBD harmonic detection method without phase locked loop is proposed.The sinusoidal amplitude integrator(SAI) is used to replace phase locked loop (PLL),and the amplitude of the grid voltage is integrated under αβ coordinate system for the sake of signal synchronized with the fundamental positive sequence voltage.Then the harmonic component can be detected.At the same time,in order to avoid the influence of power grid frequency fluctuation on harmonic detection accuracy,a frequency locked loop is introduced to structure frequency adaptive link.Compared with the traditional detection methods,this method has simple structure and fast dynamic response.The simulation experiments show that the harmonic current component can be detected accurately and quickly under the circumstances of the grid voltages unbalanced or frequency fluctuating.
Keywords：active filterFBD harmonic detectionsinusoidal amplitude integratorfrequency adaptation
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 97-102 )