Harmonic resonances may damage equipments and interrupt electric power customers services. Shutdowns may affect seriously harmonic resonant frequencies and may initiate new resonances in distribution power systems. This paper proposes various techniques for damping harmonic resonances in power systems[1-4]. A series reactor should be connected in series with the shunt power factor correction ca...

By directly simulating Maxwell's equations via the finite-difference time-domain (FDTD) method, we numerically demonstrate the possibility of achieving high-efficiency second harmonic generation (SHG) in a structure consisting of a microscale doubly-resonant ring resonator side-coupled to two adjacent waveguides. We find that ≳ 94% conversion efficiency can be attained at telecom wavelengths, f...

A new approach for efficient second-harmonic generation using diode lasers is presented. The experimental setup is based on a tapered amplifier operated in a ring resonator that is coupled to a miniaturized enhancement ring resonator containing a periodically poled lithium niobate crystal. Frequency locking of the diode laser emission to the resonance frequency of the enhancement cavity is real...

In the past few years problems like harmonic pollution or waveform distortion became more important as the load nature changed. The typical linear loads have been progressively replaced by non-linear ones, where rectifier systems have a great importance. A wide variety of industrial applications such as variable speed drives and most of power electronics’ converters use uncontrolled rectifiers ...

We present measurements of second-harmonic generation in interband transitions of InxGa12xN/GaN multiple quantum well samples. The second-order susceptibility x (2) is studied as a function of pump wavelength and quantum well width. For the narrowest wells, we obtain x (2) 51.360.4310 m/V, which is an order of magnitude larger than the intrinsic value for bulk GaN. The corresponding power conve...

There are practically four main error sources in digital sampling electricity meters: errors of analogue input circuits, errors of the sampling process, errors of analogue-to-digital (A/D) conversion and errors of digital calculations. Brief description of correction of these errors is given. Very often it is not possible to make correction of every sample. Then, only the final calculated value...

We study theoretically and experimentally second-harmonic generation (SHG) of 150-fs-duration amplified Ti:sapphire laser pulses at a wavelength of 780 nm in the nonlinear crystal KDP of different lengths and at different power densities as high as 150 GW cm(-2). The experimentally observed SHG conversion efficiency does not exceed 50%. It is shown theoretically that one possible process limiti...

We report quasi-continuous-wave, cascaded Nd:GdVO(4) self-Raman lasers based on a secondary Raman transition at 382 cm(-1) for which the Raman gain was estimated to be 0.7 cm/GW. Laser output was obtained in the near-infrared at 1108 nm, 1156 nm and 1227 nm. By incorporating intracavity sum-frequency generation (SFG) or second-harmonic generation (SHG), high power output at four discrete visibl...

Utility of non-linear load leads to generation of harmonics in industry which is affecting the power quality as well as performance of devices like motors and controllers etc. Harmonic Measurement and analysis to obtain the harmonic content of current and voltage has become vital task in context with increasing power quality. This paper discusses the effect of harmonics on power system and the ...

Recently, power quality (PQ) has because a significant issue for both power supplies and customers. Researchers in all developed countries know that power quality is one of the factors of losses in the network. Increasing power electronic equipment changes current waveform in distribution networks and this can cause many problems in networks. Distortion of voltage waveforms results in the appea...