A new optimization method is proposed in this paper for finding the firing angles in multi-level voltage source inverters to eliminate low-order selective harmonics and reduce total harmonic distortion (THD) value of the output voltage. For thid end, Fourier series is used for calculating objective function and selecting specific harmonics. Regarding the nature and complexity of the employed no...

Proliferation of nonlinear loads in power systems has increased harmonic pollution and deteriorated power quality. Not required to have prior knowledge of existing harmonics, Prony analysis detects frequencies, magnitudes, phases, and especially damping factors of exponential decaying or growing transient harmonics. In this paper, Prony analysis is implemented to supervise power system transien...

The presence of non-linear loads and the increasing number of distributed generation power systems (DGPS) in electrical grids contribute to change the characteristics of voltage and current waveforms in power systems, which differ from pure sinusoidal constant amplitude signals. Under these conditions advanced signal processing techniques are required for accurate measurement of electrical powe...

Abstract – The components of harmonics are integral multiple of the fundamental component and the components of inter-harmonics are are non integral multiple of the fundamental component. AC-DC-AC conversion systems used in variable speed drive are sources of inter-harmonics. There are several reasons for inter-harmonic generation in variable speed drives. In this paper, the generation of inter...

For most conventional analyses, the power system is essentially modeled as a linear system with passive elements excited by constantmagnitude and constantfrequency sinusoidal voltage sources. However, with the widespread proliferation of power electronics loads nowadays, significant amounts of harmonic currents are being injected into power systems. Harmonic currents not only disturb loads that...

This paper presents a method for determining the load capacity of three-phase squirrel-cage induction motors supplied with balanced distorted voltage containing rotating harmonics (1st, 5th, 7th, 11th, 13th,...). The is based on dependence motor power losses in rotor cage. was determined short-circuit measurements made frequencies equal to harmonic frequencies. To evaluate capacity, factor prop...

An extension of the HMM-based speech enhancement approach [1] is presented. The HMM-based scheme uses hidden Markov models (HMM) to control a state-dependent Wiener filter, which is used to process the noisy speech signal. This scheme gives enhanced speech signals without the annoying tonal artefacts (‘musical noise’) of the spectral subtraction approach. However, parts of the enhanced signal o...