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Energies
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Control Strategies Applied to Active Power Filters
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Control Strategies Applied to Active Power Filters

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F: Electrical Engineering".

Deadline for manuscript submissions: closed (15 November 2021) | Viewed by 9997

Special Issue Editors

Dr. Dawid Buła

E-Mail Website
Guest Editor
Faculty of Electrical Engineering, Silesian University of Technology, 44-100 Gliwice, Poland
Interests: power quality; electrical engineering; modeling and simulation
Special Issues, Collections and Topics in MDPI journals
Dr. Marcin Zygmanowski

E-Mail Website
Guest Editor
Faculty of Electrical Engineering, Silesian University of Technology, 44-100 Gliwice, Poland
Interests: Power Electronics; Power Quality; Electrical Engineering

Special Issue Information

Dear Colleagues,

Almost 50 years have passed since the first works on active power filters were published, but only in the last few years, due to enormous progress in power electronics and microcontrollers, these systems are gaining great popularity in applications. The same technological progress is also responsible for increasing importance of problems related to power quality, which are higher harmonics in supply network currents and voltages as well as the reactive power consumed by consumers. Although the basic idea of ​​active filters remains unchanged, it turns out that it is still a challenge to properly control these systems depending on the configuration (shunt, series, hybrid filters in various combinations, etc.) and the network system (single-phase, three and four-wire three-phase). This challenge is related, on the one hand, to the determination of reference signals on the basis of frequency and time methods as well as indirect methods. Various methods work correctly in different situations, they require a different number of measurement signals and computing power. On the other hand, the challenge is to properly control the output inverter of active power filter. It is not always easy to generate currents or voltages according to the reference signals with adequate accuracy when device is working under distorted voltage and when there are delays in processing. Especially if high accuracy is required in a wide range of output current and frequency.

This special issue aims to collect original research or review articles on various methods and control strategies applied to active power filters with particular emphasis on practical applications and problems occurring in real systems. 

Dr. Dawid Buła
Dr. Marcin Zygmanowski
Guest Editors

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Active Power Filters
  • Hybrid Power Filters
  • Power System Harmonics
  • Power Harmonic Filters
  • Power Quality
  • Time Domain Analysis
  • Power Filters
  • Stability
  • Current Control
  • Power Theories

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Published Papers (5 papers)

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Editorial

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3 pages, 156 KiB  
Editorial
Control Strategies Applied to Active Power Filters
by Dawid Buła and Marcin Zygmanowski
Energies 2022, 15(7), 2408; https://doi.org/10.3390/en15072408 - 25 Mar 2022
Viewed by 1491
Abstract
Almost 50 years have passed since the first works on active power filters were published [...] Full article
(This article belongs to the Special Issue Control Strategies Applied to Active Power Filters)

Research

Jump to: Editorial

18 pages, 7259 KiB  
Article
Control Method of Four Wire Active Power Filter Based on Three-Phase Neutral Point Clamped T-Type Converter
by Dawid Buła, Grzegorz Jarek, Jarosław Michalak and Marcin Zygmanowski
Energies 2021, 14(24), 8427; https://doi.org/10.3390/en14248427 - 14 Dec 2021
Cited by 10 | Viewed by 2211
Abstract
An active power filter based on a three-level neutral point clamped T-type converter with LCL input filter is presented in the paper. The main goal of the paper is the analysis of a control system that ensures independent control of a current in [...] Read more.
An active power filter based on a three-level neutral point clamped T-type converter with LCL input filter is presented in the paper. The main goal of the paper is the analysis of a control system that ensures independent control of a current in each phase. The presented control method of the filter allows reactive power compensation and/or a higher harmonics reduction to be achieved in each phase independently, with the possibility of control tan (φ) coefficient. This allows the power flow between the phases to be minimalized and reduces the RMS values of filter currents without the need to balance grid currents. The analysis presents the possibility of an operation in different modes, which was verified by experimental results. The results have been obtained in a 20 ARMS laboratory system described in the paper. The results reveal relatively low power losses, which are a feature of the selected three-level T-type topology. Additionally, that topology, when compared to a two-level one, ensures the reduction in current ripples with the same parameters of passive components. Full article
(This article belongs to the Special Issue Control Strategies Applied to Active Power Filters)
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25 pages, 8682 KiB  
Article
Control Strategy of 1 kV Hybrid Active Power Filter for Mining Applications
by Dawid Buła, Jarosław Michalak, Marcin Zygmanowski, Tomasz Adrikowski, Grzegorz Jarek and Michał Jeleń
Energies 2021, 14(16), 4994; https://doi.org/10.3390/en14164994 - 14 Aug 2021
Cited by 2 | Viewed by 1979
Abstract
The paper presents a shunt hybrid active power filter for 1 kV mining applications in configuration with a single-tuned passive filter. The focus is on the method of controlling the filter, with particular emphasis on the influence of network voltage distortion and time [...] Read more.
The paper presents a shunt hybrid active power filter for 1 kV mining applications in configuration with a single-tuned passive filter. The focus is on the method of controlling the filter, with particular emphasis on the influence of network voltage distortion and time delays in control on the effectiveness of harmonic reduction, which is one of the most important aspect of power quality. The low-power loss configuration of a hybrid filter with SiC transistors is shown, as well as the control algorithm which limits the influence of voltage distortion. Theoretical considerations are verified by results obtained from simulations and tests of the hybrid active power filter prototype. Full article
(This article belongs to the Special Issue Control Strategies Applied to Active Power Filters)
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16 pages, 6033 KiB  
Article
Harmonics Compensation by Using a Multi-Modular H-Bridge-Based Multilevel Converter
by Raul Gregor, Julio Pacher, Alejandro Espinoza, Alfredo Renault, Leonardo Comparatore and Magno Ayala
Energies 2021, 14(15), 4698; https://doi.org/10.3390/en14154698 - 3 Aug 2021
Cited by 6 | Viewed by 1886
Abstract
This paper presents an active power filter based on a seven-level cascade H-bridge where the main contribution is a control strategy that combines model-based predictive control, the voltage vectors of the converter output levels, the phase shift PWM technique, and suboptimal DC-link voltage [...] Read more.
This paper presents an active power filter based on a seven-level cascade H-bridge where the main contribution is a control strategy that combines model-based predictive control, the voltage vectors of the converter output levels, the phase shift PWM technique, and suboptimal DC-link voltage control. The proposed scheme greatly simplified the overall control system, making it well suited to compensate the current harmonics distortion at the grid side, generated by nonlinear loads connected to the point of common coupling. In addition, the proposed method achieved a balancing of the capacitor voltages of the seven-level cascade H-bridge converter by using the minimum DC-link voltage sensors. This feature significantly reduced the control system complexity and provided a low computational burden. Experimental results confirmed the feasibility and effectiveness of the proposed controller. Full article
(This article belongs to the Special Issue Control Strategies Applied to Active Power Filters)
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21 pages, 5268 KiB  
Article
CPC-Based Minimizing of Balancing Compensators in Four-Wire Nonsinusoidal Asymmetrical Systems
by Zbigniew Sołjan, Grzegorz Hołdyński and Maciej Zajkowski
Energies 2021, 14(7), 1815; https://doi.org/10.3390/en14071815 - 24 Mar 2021
Cited by 11 | Viewed by 1615
Abstract
The article presents the possibility of using the currents’ physical components (CPC) theory to generate the reference current of the active power filter (APF). The solution proposed by the authors is based on the cooperation of minimizing balancing compensators (MBC), which, due to [...] Read more.
The article presents the possibility of using the currents’ physical components (CPC) theory to generate the reference current of the active power filter (APF). The solution proposed by the authors is based on the cooperation of minimizing balancing compensators (MBC), which, due to their use in 4-wire systems, have been divided into two structures. The first compensator, which purpose is to minimize and balance the reactive current and the unbalanced current of the zero sequence, is built in the star system (STAR-MBC). The purpose of the second compensator, which operation occurs in the delta system (DELTA-MBC), is to minimize and balance the other two components, i.e., the unbalanced current of the negative sequence and the unbalanced current of the positive sequence. The two structures cooperating with each other significantly reduce the currents associated with the reactive elements, i.e., reactive current, and the unbalanced current. As mentioned, these currents are reduced but not compensated to zero or to the reference value. In order for the compensation and balancing to bring the preferable effect, an APF system should be included, which will cooperate with MBC compensators. This solution is presented in this publication. The control of the active part of the hybrid active power filter (HAPF), which was presented in the paper, consists of the reflection of the waveform of the nonsinusoidal active current. In this approach, no current shift in relation to voltage is obtained, but the waveforms of these quantities remain distorted. The reactive current is compensated and the unbalanced currents are balanced. The second definition of generating a reference current can also be used. Through this approach, the active current with a sinusoidal waveform is achieved. The second approach allows for an additional reduction of the three-phase RMS value of the load’s current. In both of these approaches, the active currents flowing through the lines will reflect the amplitude and phase asymmetry that is present in the supply voltage. The APF system will follow the changes in power or load conditions and generate the correct value for the reference current. The calculations presented in the article, as well as the current and voltage waveforms, were created as a result of the constructed mathematical models, which were used for theoretical illustrations. Calculations and waveforms were generated based on a script written in Matlab. Full article
(This article belongs to the Special Issue Control Strategies Applied to Active Power Filters)
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