Triplen harmonics – A devil in your network software tool? This blog post addresses potential “issues” with triplen harmonics when performing a network harmonic study. Positive, negative and zero sequence The theory of symmetrical components tells that a periodic signal can be decomposed into harmonics of positive, negative and zero Read more…
How strong is a strong grid? When evaluating the impact of a VFD on the electric grid, particularly the harmonic distortion, we often talk about “strong grid” or “weak grid”. These terms may be a bit vague or at least relative. In this post we try to put the grid Read more…
Active harmonic mitigation with AFE drives In this article we will once again touch the topic of grid side harmonics, particularly focusing on active harmonic mitigation with AFE drives. Abbreviations used: AFE = Active Front End APF = Active Power Filter ASD = Adjustable Speed Drive (synonym to VFD) DFE Read more…
Network harmonics: Mitigation methods Today’s post focuses on harmonic mitigation methods. Let us review the most common, well proven methods of minimization of harmonic distortion on the grid side. Previous articles presented a general view on harmonics, their origin and effects [1]. The grid side harmonic spectrum of VFDs had Read more…