Numerical relays have become essential tools for carrying out the protection and surveillance tasks of electrical power systems. These implement their functions from phasors network signals, estimated by digital processing using filters. Digital filters must meet certain requirements, such as providing a fast effective response to increasingly complex transient signals made up components that m...

The authors develop consistent nonparametric estimation techniques for the directional mixing density. Classical spherical harmonics are used to adapt Euclidean techniques to this directional environment. Minimax rates of convergence are obtained for rotationally invariant densities verifying various smoothness conditions. It is found that the difference in smoothness between the Laplace, the G...

Harmonics are undesirable greater frequencies that overlaid on the fundamental sinusoidal waveform resulting in creating a distorted waveform. This distortion forms non-sinusoidal composed of set harmonic frequencies, which is harmful to electrical power supply lines. paper proposes an ADALINE-based algorithm simulated with MATLAB using half-cycle samples. Widrow and Hoff developed ADALINE, sin...

Thyristor controlled static compensators consist of two basic schemes, TCR and TSC. Owing to the discontinuous current in TCR, current harmonics are generated in the supply system. This paper introduces two methods for the reduction of these harmonics. On the basis of the coordination or uncoordination of turn ratios with harmonic reduction levels, each method is described in two alternative sc...

In a previous work, we developed a consistent TAC (tissue attenuation coefficient) estimator using bubble echoes. Based on temporal averaging, we can improve the estimation precision of TAC for the tissue bounded between two vessels. In this paper, we extend it to use frequency diversity for saving interrogation time by transmit multiple narrowband signals in each pulse. At first, we analyze th...

Industrial and domestic equipments use non-linear electronic components. As examples of these nonlinear loads: rectifiers, inverters, choppers or in a general manner, all equipments using the electronic switches and the junctions with semiconductors. This creates non sinusoidal electrical currents which will be injected in the electrical supply network. These non sinusoidal currents present oth...

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...