Special Issue "Active Power Filters and Power Quality"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Smart Grids and Microgrids".

Deadline for manuscript submissions: 31 January 2021.

Special Issue Editor

Prof. Dr. Marcin Maciążek
Website
Guest Editor
Silesian University of TechnologyFaculty of Electrical Engineering44-100 GliwicePoland
Interests: active power filters; power quality; power theories; control algorithms; digital signal processing

Special Issue Information

Dear Colleagues,

The modern world is full of goods and electric energy is just one of them. Producers want to sell goods and clients want to buy, but, of course, energy should be of good quality. Why is quality so important? Products of advanced technology need a stable and clean supply. Disturbances can cause failures, such as hangs in telecommunication devices, additional losses in power lines, increased current in neutral wires, resonance phenomena, and even production shutdowns brought on by improper operation of protection systems. All these cases cost us billions of dollars each year. What is behind power disturbances? They are mainly caused by nonlinear loads. Their presence in the network is the reason for the deformations of voltage and currents waveforms. A few decades ago, there were mainly stable large power industrial loads. Deformations caused by such types of loads are relatively easy to fix by using passive filters. At present, a very large number of small nonlinear loads (like phone and computer power supplies, led lights, etc.) cause more stochastic disturbances. The best way to reduce this type of disturbances is the application of active power filters. APFs connected to power systems, depending on control strategy and configuration, can realize higher harmonic reduction, and reactive power compensation or symmetrization in power supply systems.

Prof. Dr. Marcin Maciążek
Guest Editor

Manuscript Submission Information

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Keywords

  • Active power filters
  • Hybrid active power filters
  • Unified power flow controllers
  • Harmonics reduction
  • Reactive power compensation
  • Power quality.

Published Papers (2 papers)

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Research

Open AccessArticle
Active Filter Reference Calculations Based on Customers’ Current Harmonic Emissions
Energies 2021, 14(1), 220; https://doi.org/10.3390/en14010220 - 04 Jan 2021
Abstract
This paper deals with harmonics compensation in industrial and distribution networks using an active filter (AcF). When defining the AcF’s reference current, it is important to properly consider the network background harmonic distortion. Within this paper, we propose an AcF reference current calculation [...] Read more.
This paper deals with harmonics compensation in industrial and distribution networks using an active filter (AcF). When defining the AcF’s reference current, it is important to properly consider the network background harmonic distortion. Within this paper, we propose an AcF reference current calculation method, based on customers’ current harmonic emissions. The main novelty of the paper is the AcF reference current calculation method that considers only the customer’s contributions to the harmonic distortion at the point of common coupling (PCC). By separating the harmonic current at the PCC into components that can be attributed to the customer and to the network, it is possible to limit the required AcF power. To determine the customer’s emission, the customer’s harmonic impedance must be known. As the actual harmonic impedance cannot be determined in a real environment, a reference harmonic impedance can be used instead. To test the proposed AcF reference current calculation method, we developed a control algorithm of an AcF in the PSCAD software and tested this on a medium-voltage benchmark simulation model. Full article
(This article belongs to the Special Issue Active Power Filters and Power Quality)
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Open AccessArticle
Software Solution for Modeling, Sizing, and Allocation of Active Power Filters in Distribution Networks
Energies 2021, 14(1), 133; https://doi.org/10.3390/en14010133 - 29 Dec 2020
Abstract
The paper is related to the problem of modeling and optimizing power systems supplying, among others, nonlinear loads. A software solution that allows the modeling and simulation of power systems in the frequency domain as well as the sizing and allocation of active [...] Read more.
The paper is related to the problem of modeling and optimizing power systems supplying, among others, nonlinear loads. A software solution that allows the modeling and simulation of power systems in the frequency domain as well as the sizing and allocation of active power filters has been developed and presented. The basic assumptions for the software development followed by the models of power system components and the optimization assumptions have been described in the paper. On the basis of an example of a low-voltage network, an analysis of the selection of the number and allocation of active power filters was carried out in terms of minimizing losses and investment costs under the assumed conditions for voltage total harmonic distortion (THD) coefficients in the network nodes. The presented examples show that the appropriate software allows for an in-depth analysis of possible solutions and, furthermore, the selection of the optimal one for a specific case, depending on the adopted limitations, expected effects, and investment costs. In addition, a very high computational efficiency of the adopted approach to modeling and simulation has been demonstrated, despite the use of (i) element models for which parameters depend on the operating point (named iterative elements), (ii) active filter models taking into account real harmonics reduction efficiency and power losses, and (iii) a brute force algorithm for optimization. Full article
(This article belongs to the Special Issue Active Power Filters and Power Quality)
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