This paper presents a new Hybrid Filter for compensating voltage/current harmonic in Variable Frequency Drives (VFD). It is a combined system of Shunt Passive Filter (SPF) and a Series Active Filter (SAF) is a cost-effective and practical way of mitigating both current and voltage harmonics generated in a power system due to the presence of non-linear loads. In this paper a practical VFD system...

This paper presents the simulation of Shunt Active Power filter by using two different control schemes, indirect current control technique and ANN control technique. These two controle techniques are working under both balanced and unbalanced three phase voltage source conditions and it is feeding to a adjustable speed drive the torque speed characteristics of a motor is presented. Indirect cur...

This paper deals with simulation of shunt active filters using fuzzy logic to improve the power quality and reduction in the transient time of capacitor voltage, when there is change in load. Shunt active power filter can compensate current harmonics by injecting equal-but-opposite harmonic compensating current .A new control strategy is proposed which is based on energy of the capacitor, dc-li...

Voltage stability analysis based on the number of limit violating buses apart from considering the voltage magnitude violations using several severity functions is performed in this work. Deviating from existing works in literature, the double line contingency is considered based on the three types of severity functions: discrete, continuous and percentage of violation severity functions. The s...

We show that quantitative information on the electrical deactivation of doping can be obtained by combining the results of positron annihilation, secondary ion-mass spectrometry, and capacitance-voltage measurements. By applying this method to study the N doping of ZnS0.06Se0.94 , we can conclude that the fraction of electrically inactive nitrogen may vary from 0% to 80%, depending strongly on ...

This article presents material based on the results of analysis literature sources automatic devices for regulating reactive power in supply systems. The operating mode compensating is determined taking into account permissible voltage deviations at terminals electric receivers. Voltage, load current, directions, factor, phase angle between and time can be used as control parameters. In additio...

− This paper studies the possibilities of decomposition of the current in three-phase, three-wire systems based on the classic p-q theory proposed by Akagi and further developed and, respectively, on the Czarnecki’s theory. In the case of distorted current absorbed by a nonlinear load, the resulted components can be used to generate the reference compensating current in three-phase active power...

Recent years, embedded generators have been increasingly installed in distribution system in many parts of the world. Depending on their operating characteristics and locations, embedded generators could significantly affect the voltage profile, network losses and fault level in a distribution system. This paper presents a new technique for determining optimal allocation and sizing of embedded ...

The wind energy stands out to be one of the most promising new sources of electrical power in the near term. The latest technological advancements in wind energy conversion and an increased support from governmental and private institutions have led to increased wind power generation in recent years. Wind power is the fastest growing renewable source of electrical energy hence it has become nec...

Active power filters are used to eliminate current harmonics of non-linear loads. This paper evaluates three different methods of determining the compensating current for a shunt active filter that is working under nonsymmetrical conditions. The paper compares the instantaneous reactive power theory, the synchronous reference frame theory and fast Fourier transform techniques. The comparison is...