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Shunt active power filters (APF) are widely used in power systems to eliminate the current harmonics and to compensate reactive power due to their accurate and fast operation. In this paper the instantaneous power theory is used to extract the harmonic components of system current. Then fixed-band hysteresis current control is explained. Because of fixed-band variable frequency disadvantages, the...
In this paper the orthogonal transformation technique or virtual two axis strategy which was instigated by Akagi et al in 1984 for three phase power systems has been extended by Dobrucky and Pokorny in 1999 for the determination of instantaneous power in single phase power systems. This technique is described in detail in two of the authors' previous publications, by adopting this technique, an expression...
Intelligent techniques of harmonic detection or estimation are nowadays of a great interest in power system applications, their ability to deal with high non-linearities attract researchers to investigate the performance of these methods mainly based on artificial intelligence namely using artificial neural networks (ANNs). In the literature many harmonic detection or estimation methods were presented,...
Increasing demand for electric power reliability in industrial consumers, such as high-tech science parks, has led to the development of a loop power system. The harmonic resonance, due to power factor correction capacitors and line inductors or transformer leakage inductance, may cause significant voltage distortion along the feeder. A discrete frequency tuning active filter is proposed in this paper...
In this paper, a new ant colony system (ACS) based-method is proposed for the implementation of optimal harmonic power flow in power systems. In this algorithm, allocating and sizing of active power filters (APFs) are performed in order to minimize the voltage total harmonic distortion (VTHD) as well as total current injecting of the APFs. The VTHD limit standard is also satisfied as a constraint...
The main purpose of this paper is the study of the shunt active power filter (APF) compensations capability for different perturbations in three wire AC power system such as current unbalance, phase shift current and undesired harmonics generated by non linear load under balanced power system voltages. Indeed Shunt APF has been proved to be an effective solution to compensate for such disturbances...
In this paper, two efficient and reliable neural approaches to control an inverter are developed. The objective is to improve the compensation performance of a conventional active power filter (APF) with a homogeneous neural structure allowing an efficient hardware implementation. The first control approach is based on a neural PI regulator. This technique uses an Adaline to determine the PI parameters...
This paper compares different variants of the least mean squares (LMS) algorithm. The objective consists in finding the best compromise between on-line learning and computational costs. Indeed, an algorithm with low computational complexity for updating Adalines weights is required for a real-time implementation of a modular neural Active Power Filter (APF). This filtering scheme is inserted in an...
The procedure for calculating controller parameters of the APFs implemented into a multibus industrial power system for harmonic voltage mitigation is presented. The node voltage detection control strategy is applied and the basic controller parameters are found under the condition that demanded THD factors at the buses where the APFs are placed will be obtained. A cooperative control of several APFs...
Harmonic line currents due to nonlinear loads cause nonsinusoidal grid voltages in electrical power systems. Shunt active power filters (SAPFs) can be employed to improve the system efficiency but their design must consider nonsinusoidal conditions. The Fryze, Buchholz, and Depenbrock method has been applied to controllers in SAPFs, allowing the compensation of the load nonactive power. A drawback...
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