This paper presents an adaptive harmonic current extraction scheme using notch filters combined with a modified discrete wavelet-packet transform (DWPT). The is applied to MMCC-STATCOM for mitigating harmonics distortion in power line. DWPT incorporates data expansion technique overcome the limitations of boundary effect. It identifies rms values dominant elements non-stationary real-time, thes...

In this study, it is aimed to eliminate the harmonics selected by selective harmonic elimination (SHE) method in a 7-level cascade multilevel inverter using artificial neural networks (ANNs). A control algorithm has been developed which 3rd and 5th or 7th can be eliminated according selection while adjusting output voltage amplitude of inverter. The required switching angles for SHE are calcula...

Nowadays with increasing use of numerous nonlinear loads, voltage and current harmonics in power systems are one of the most important problems power engineers encounter. Many of these nonlinear loads, because of their dynamic natures, inject time-varying harmonics into power system. Common techniques applied for harmonics measurement and assessment such as FFT have significant errors in presen...

active filters have proven to be more effective than passive techniques to improve power quality and to solve harmonic and power factor problems due to nonlinear loads. this paper proposes a control scheme based on the instantaneous active and reactive power. the inverter of this active filter is a three-phase, two-level converter. space vector technique is used as modulators and pattern genera...

Determination of pulse patterns for the elimination of some low-order harmonics of a PWM inverter necessitates to solve a system of nonlinear transcendental equations. When Newton’s algorithm is applied, it can be estimated that at each iteration, 2xN2 trigonometric functions have to be evaluated, N being the number of unknown switching angles in the first quarter-period interval. This is very ...

<span id="docs-internal-guid-09d7eb9c-7fff-b2fc-ebd1-1a60862765dc"><span>Selective Harmonic elimination has emerged as an in-depth research method to replace traditional PWM technology. This study demonstrates the selective harmonic by using a hybrid Genetic algorithm GA and local search (GA-LS) of uniform asymmetric multilevel inverter called USAMI That removes higher-order harmoni...

This paper proves the effectiveness of Least Mean Square (LMS) estimation algorithm for estimation of power system harmonics, inter-harmonics and sub-harmonics of distorted signal. Accurate estimation can be achieved by this technique for harmonics, sub-harmonics and inter-harmonics estimation including possible variation in the signal such as change in amplitude when applied to a distorted pow...

support and help. His precious advice and numerous discussions enhanced my knowledge and scientific inspiration. preparation of the laboratory setup is especially appreciated. Finally, I am very grateful for my wife Ann's and son Kacper's love, patience and faith. I would also like to thank my whole family, particularly my parents for their care over the years. Introduction 2 1. INTRODUCTION Me...