Multilevel inverter technology has emerged recently as a very important alternative in the area of high-power medium-voltage energy control. This paper presents modeling and simulation of a single phase simplified eleven-level inverter (SELl). Multilevel inverter offers high power capability. Its performance is highly superior to that of conventional two-level inverter due to reduced harmonic d...

We present an ab initio three-dimensional quantum study of the coherent control of high-order harmonic generation ~HHG! processes in intense pulsed laser fields by means of the genetic algorithm optimization of the laser-pulse amplitude and phase. Accurate time-dependent wavefunction and HHG power spectrum are obtained by the time-dependent generalized pseudospectral method and wavelet transfor...

This review discusses a new method for probing the evolution of the valence-electron structure of molecules during chemical reactions. The method relies on the interaction of an intense infrared laser pulse with molecules that results in the emission of attosecond pulses (1 as = 10(-18) s) in a process known as high-harmonic generation. Time-resolved high-harmonic spectroscopy measures the phas...

This paper presents Simultaneous variation and control of the output voltage and frequency, reduction in the harmonic components in load currents. These inherent features have to be employed in many industrial applications such as variable speed drives, uninterruptible power supplies and other power conversion systems. However, the reduction of the harmonic components in output currents and vol...

A numerical methodology is proposed for the calculation of transient electromagnetic interference induced by overhead high-voltage power lines in metallic structures buried soil—pipelines oil or gas transportation. series 2D finite element simulations was employed to sample harmonic response a given geometry section. The inverse Laplace transform results allowed obtaining time domain evolution ...

Beams that experience third-harmonic generation ~THG! also experience Kerr effects. With Kerr effects, beams do not take simple Gaussian shapes, but exhibit nonlinear dynamics. These nonlinear dynamics have an effect on the THG accumulated by focusing and then diverging beams. We formulate a self-consistent and complete set of nonlinear Schrödinger equations for a pair of coupled beams—a fundam...

Some of the theoretical models in the literature describing the mechanism of hologram formation in photopolymer materials predict the existence of higher harmonics in the Fourier expansion of the recorded refractive index. Nevertheless, quantitative information is only obtained for the first harmonic of the refractive index using Kogelnik's Coupled Wave Theory. In this work we apply the Rigorou...

We present a method for a complete characterization of a femtosecond ultraviolet pulse when a fundamental near-infrared beam is also available. Our approach relies on generation of second harmonic from the pre-characterized fundamental, which serves as a reference against which an unknown pulse is measured using spectral interference (SI). The characterization apparatus is a modified second har...

A single superconducting artificial atom can be used for coupling electromagnetic fields up to the single-photon level due to an easily achieved strong coupling regime. Bringing a pair of harmonic oscillators into resonance with the transitions of a three-level atom converts atomic spontaneous processes into correlated emission dynamics. We present the experimental demonstration of two-mode cor...

Harmonic interference is a major hazard in the current power system that affects quality. How to extract harmonics quickly and accurately premise ensure sustainable operation of system, which particularly important field new energy generation. In this paper, harmonic extraction method based on time-varying observer proposed. Firstly, frequency estimation algorithm used estimate grid frequency, ...