Multilevel inverters have been widely applied industries. A family of optimal puisewidth modulation (PWM) methods for multilevel inverters, such as step modulation, can generate output voltage with less harmonic distortion than popular modulation strategies, such as the carrier-based sinusoidal PWM or the space vector PWM. However, some drawbacks limit the application of optimal PWM. One of suc...

This paper presents an improved method for determining the contribution of harmonic distortion generated by utility and customer at the Point of Common Coupling (PCC) in a distorted power system. For this purpose, first the magnitude and phase of voltage and current at the PCC in each frequency are estimated by adaptive Kalman filter. Then the parameters of Thevenin equivalent circuits of load ...

In recent time, the power quality has attracted a lot of attention due to extensive emphasis by power utility on the power system efficiency and end users awareness of power quality issues. This has occurred mainly due to the sensitivity of the modern equipment and the deregulation of the power distribution. In addition, there are usually massive losses both to power utility and end users due t...

Distorted voltage and current waveforms is one of the problems associated to electric power quality. Continuous use of non-linear loads provokes the existence of voltage waveforms with a high distortion. Thus, it is necessary to know the responsible of this problem by means of the commonly named distortion sources identification. In this paper, the problem is analyzed through the harmonic power...

The harmonic currents are generated by single phase nonlinear loads. The mirror surplus harmonic elimination method is used mostly because of its less computation. The Selective Harmonic Elimination Pulse Width Modulation (SHEPWM) based methods can provide theoretically the highest quality output among all the PWM methods. In this paper SHEPWM model of a multilevel series connected voltage sour...

To study the impact of fundamental flow and background harmonics on harmonic and resonance characteristics of high-speed train-network coupling systems, harmonic admittance matrix model for four quadrant converter is deduced with the method of FFT and Bessel function. Equivalent load of train and chain network model of multiple conductors was established to conduct the calculation of fundamenta...

In this technical note the rf control and detection system for a detector of small harmonic displacements based on two coupled microwave cavities (PACO) is presented. The basic idea underlying this detector is the principle of parametric power conversion between two resonant modes of the system, stimulated by the (small) harmonic modulation of one system parameter. In this experiment we change ...

In the harmonic active power measurement, the highest uncertainties are generally introduced by the current and voltage transducers. In a previous paper, the authors showed that the current transformer (CT) can introduce significant errors in such measurement, especially if the phase shift between voltage and current is close to ±90 . In such condition the errors on harmonic power measurement a...

Power quality management is the main problem that the industry is facing today. This is mainly affected by the generation of harmonics. The growing use of electronic equipment produces a large amount of harmonics in distribution systems because of non-sinusoidal currents consumed by non-linear loads. As we know for the better quality of power, the voltage and current waveforms should be sinusoi...

This paper presents the Power generation with renewable energy sources is essential in now a days to control the atmospheric pollution and global warming. But interconnection of these sources to the power system brings problem of voltage fluctuation and harmonic distortion. The wind energy conversion system is designed and it is synchronized with a 14-Bus radial distribution system through the ...