electric arc furnace (eaf) is one of the largest loads in electric power systems. it is highly time varying and nonlinear. its reactive power variations cause voltage fluctuations in nearby system which is known as flicker. on the other hand the nonlinear voltage-current characteristic causes strong voltage and current harmonics in eaf. to this end flexible ac transmission systems (facts) techn...

An exact fast algorithm is developed for the direct spin-weighted spherical harmonics transforms of bandlimited spin ±2 functions on the sphere. First, we define spin functions on the sphere and their decomposition in an orthonormal basis of spin-weighted spherical harmonics. Second, we discuss the a priori O(L4) asymptotic complexity of the spin ±2 spherical harmonics transforms, where 2L stan...

3D q-space can be viewed as the surface of a 4D hypersphere. In this paper, we seek to develop a 4D hyperspherical interpretation of q-space by projecting it onto a hypersphere and subsequently modeling the q-space signal via 4D hyperspherical harmonics (HSH). Using this orthonormal basis, we analytically derive several quantitative indices and numerically estimate the diffusion ODF. Importantl...

The use of pulse width modulation (PWM) to drive permanent magnet synchronous motors (PMSM) inevitably creates current harmonics. generated harmonics create harmonic components the electromagnetic force, causing noise and vibration in PMSM affecting applied system. In this paper, effect PMSM’s force on a reciprocating compressor is analyzed. First, two PMSMs with different forces were designed....

This paper compares the performance of diode clamped three level inverter based STATCOM with sinusoidal and space vector PWM techniques. Space Vector Pulse Width Modulation (SVPWM) technique is the most advantageous technique than the conventional sinusoidal PWM technique for a multilevel inverter. The space vector pulse width modulation technique is an advanced, computation-intensive PWM metho...

A graphical formalism is presented, showing that "UNaliasing by Fourier-encoding the Overlaps Using the temporaL Dimension" (UNFOLD) is equivalent to sampling k-t-space in a sheared grid pattern. Discrete regular sampling in k-t-space leads to periodic replication of the support region in x-f-space. Thus, the maximum acceleration achievable by UNFOLD is equivalent to the maximum packing of supp...

Two approaches to calculate the population of hot carriers in semiconductor devices are studied in this thesis. Hot carriers are of interest because they have an energy significantly higher than the mean carrier energy and can thus cause device degradation by injection into the oxide and by interface state generation. In the first approach the hydrodynamic model was used to calculate the first ...

In this paper, we address the topic of monogenic curvature scale-space. Combining methods of tensor algebra, monogenic signal and quadrature filter, the monogenic curvature signal, as a novel model for intrinsically two-dimensional (i2D) structures, is derived in an algebraically extended framework. It is unified with a scale concept by employing damped spherical harmonics as basis functions. T...