Dissertations / Theses on the topic 'Active power filter (APF)'
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Al-Bayaty, Hussein Kamal Anwer. "Novel methods of utilization, elimination, and description of the distortion power in electrical circuits." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/10646.
Full textLiebig, Sebastian. "Optimization of rectifiers for aviation regarding power density and reliability." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-159936.
Full textHauptziele des sogenannten "More Electrical Aircraft" (MEA) sind Effizienzerhöhung und Gewichtseinsparung. Ein Schwerpunkt hierbei ist die Nutzung von elektrischen statt hydraulischen, pneumatischen und mechanischen Systemen. Die notwendigen Leistungselektroniken haben DC-Zwischenkreise, welche mittels aktiven B6 und passiven B12 Gleichrichtern aus dem Dreiphasennetz gespeist werden. Eine mögliche Alternative ist die B6 Diodenbrücke in Kombination mit einem aktiven Netzfilter, welcher aufgrund der parallelen Anordnung eine höhere Leistungsdichte aufweist und darüber hinaus mehrere Geräte gleichzeitig entstören kann. Die alleinige Nutzung einer Diodenbrücke ist aufgrund des hohen Anteils von Stromharmonischen nicht zulässig. Diese Arbeit beschäftigt sich mit der Entwicklung eines aktiven Filters für ein Dreiphasensystem mit variabler Frequenz von 360 bis 800 Hz. Es werden alle relevanten Bauteile wie Induktivitäten, EMV-Filter, Leistungsmodule und Zwischenkreiskondensator ausgelegt. Besonderes Augenmerk liegt auf dem kundenspezifischen Modul mit SiC-Dioden und SiCMOSFETs, welches vollständig elektrisch und thermisch charakterisiert wird. Die Änderung der Netzfrequenz beträgt bis zu 50 Hz/ms, was eine hohe Dynamik und Robustheit von der Filterregelung verlangt. Weiterhin ist im statischen Fall eine hohe Genauigkeit gefordert, da die 5. und 7. Harmonische auf unter 2% geregelt werden müssen. Um beiden Anforderungen gerecht zu werden, wird ein zweistufiger Regelungsalgorithmus entwickelt der auf zwei digitalen Signalprozessoren implementiert wird. Simulationen und Labormessungen bestätigen die Robustheit des Regelungskonzeptes. Diese Arbeit stellt umfassend die Entwicklung von Luftfahrtgleichrichtern dar. Die Ergebnisse wurden in Konferenzen und Patenten veröffentlicht
Othman, Mohd Ridzal. "DSP-based active power filter." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/6966.
Full textOrts, Grau Salvador. "Sistema de compensación mediante filtro activo de potencia con sistema de obtención de las corrientes de referencia selectivo utilizando control 3D-3B SVPWM de la etapa de potencia. Aplicación a sistemas industriales a 4 hilos." Doctoral thesis, Universitat Politècnica de València, 2008. http://hdl.handle.net/10251/3797.
Full textOrts Grau, S. (2008). Sistema de compensación mediante filtro activo de potencia con sistema de obtención de las corrientes de referencia selectivo utilizando control 3D-3B SVPWM de la etapa de potencia. Aplicación a sistemas industriales a 4 hilos [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/3797
Palancia
Cheng, Louis. "Efficient DSP-based active power filter." Thesis, Teesside University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410837.
Full textLiebig, Sebastian. "Optimization of rectifiers for aviation regarding power density and reliability." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2014. https://monarch.qucosa.de/id/qucosa%3A20187.
Full textHauptziele des sogenannten "More Electrical Aircraft" (MEA) sind Effizienzerhöhung und Gewichtseinsparung. Ein Schwerpunkt hierbei ist die Nutzung von elektrischen statt hydraulischen, pneumatischen und mechanischen Systemen. Die notwendigen Leistungselektroniken haben DC-Zwischenkreise, welche mittels aktiven B6 und passiven B12 Gleichrichtern aus dem Dreiphasennetz gespeist werden. Eine mögliche Alternative ist die B6 Diodenbrücke in Kombination mit einem aktiven Netzfilter, welcher aufgrund der parallelen Anordnung eine höhere Leistungsdichte aufweist und darüber hinaus mehrere Geräte gleichzeitig entstören kann. Die alleinige Nutzung einer Diodenbrücke ist aufgrund des hohen Anteils von Stromharmonischen nicht zulässig. Diese Arbeit beschäftigt sich mit der Entwicklung eines aktiven Filters für ein Dreiphasensystem mit variabler Frequenz von 360 bis 800 Hz. Es werden alle relevanten Bauteile wie Induktivitäten, EMV-Filter, Leistungsmodule und Zwischenkreiskondensator ausgelegt. Besonderes Augenmerk liegt auf dem kundenspezifischen Modul mit SiC-Dioden und SiCMOSFETs, welches vollständig elektrisch und thermisch charakterisiert wird. Die Änderung der Netzfrequenz beträgt bis zu 50 Hz/ms, was eine hohe Dynamik und Robustheit von der Filterregelung verlangt. Weiterhin ist im statischen Fall eine hohe Genauigkeit gefordert, da die 5. und 7. Harmonische auf unter 2% geregelt werden müssen. Um beiden Anforderungen gerecht zu werden, wird ein zweistufiger Regelungsalgorithmus entwickelt der auf zwei digitalen Signalprozessoren implementiert wird. Simulationen und Labormessungen bestätigen die Robustheit des Regelungskonzeptes. Diese Arbeit stellt umfassend die Entwicklung von Luftfahrtgleichrichtern dar. Die Ergebnisse wurden in Konferenzen und Patenten veröffentlicht.
Sedighy, Mohammad. "A robust VSC-based shunt active power filter." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/NQ41307.pdf.
Full textMuthu, Subramanian. "Analysis and control of unified active power filter." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ37357.pdf.
Full textSchmit, Andrew Paul. "Hybrid Active Power Filter with Output Impedance Control." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/79684.
Full textMaster of Science
Van, Greunen Corneluis Erasmus. "Neutral-point-clamped shunt active filter." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1265.
Full textBooth, Brian. "An Active Power Supply Filter with Ultra Wide Bandwidth." Thesis, North Dakota State University, 2016. https://hdl.handle.net/10365/28281.
Full textArman, Mahmoud Fayez. "An 'active' passive-filter topology for low power DC/AC inverters." Thesis, Brunel University, 2011. http://bura.brunel.ac.uk/handle/2438/6072.
Full textMkhize, Michael. "Design and implementation of a single phase active power filter." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11061.
Full textLi, Ruomei. "Modelling of active filters for improving power quality." Thesis, University of Bath, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323585.
Full textMossoba, Joseph T. "Unit-delay deadbeat control of a high bandwidth active power filter." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ63023.pdf.
Full textCarastro, Fabio. "Power quality enhancement using a shunt active filter with energy storage." Thesis, University of Nottingham, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493118.
Full textMohd, Siam Mohd Fadzil. "The control of a static var compensator and active power filter." Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/1210.
Full textFereidouni, Alireza. "Shunt Active Power Filter Enhancement Using Advanced Control and Modulation Techniques." Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/2482.
Full textNarayanasamy, Balaji. "Impedance Mismatching Based Design of Passive and Active EMI Filters for Power Converters." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461252861.
Full textFeng, Xiaohu. "Active filter for improving a switched reluctance motor drive's input power quality." Lexington, Ky. : [University of Kentucky Libraries], 2005. http://lib.uky.edu/ETD/ukyelen2005t00346/THESIS2.pdf.
Full textTitle from document title page (viewed on January 23, 2006). Document formatted into pages; contains: x, 97 p. : ill. (some col.). Includes abstract and vita. Includes bibliographical references (p. 95-96).
Malleichervu, Govind N. "PROPORTIONAL FEEDBACK CONTROL OF DUTY CYCLE FOR DC HYBRID ACTIVE POWER FILTER." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/555.
Full textMassoud, Ahmed Mohammed. "Application of the cascaded multilevel inverter as a shunt active power filter." Thesis, Heriot-Watt University, 2004. http://hdl.handle.net/10399/321.
Full textUcak, Onur. "Design And Implementation Of A Voltage Source Converter Based Hybrid Active Power Filter." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611095/index.pdf.
Full textZhang, Huibin. "Application of multilevel inverter as shunt active power filter in three-phase three-wire power system." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501797.
Full textKim, Jong Wan. "Back to Back Active Power Filter for Multi-Generator Power Architecture with Reduced dc-link Capacitor." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/96638.
Full textDoctor of Philosophy
The transportation electrification has gained more and more attention due to its smaller carbon dioxide emission, better fuel efficiency. The recent advances in power devices, microcontrollers, and transducers accelerate the electrification of transportation. This trend is shown in the propulsion system in marine transport as well and the electric propulsion system has been widely used to meet the strict environmental regulations. However, the non-linear circuit components such as capacitor and diode in the electric propulsion system draw non-linear current and significantly deteriorate power quality and lead to critical problems such as reduced life span of circuit components Accordingly, a front-end is required to improve power quality. Also, it is desired to have compact and lightweight front-end for installation flexibility and fuel efficiency improvement. In this dissertation, several front-ends using a phase-shift transformer are reviewed and a detailed analysis is provided to help understand the harmonic cancellation principle of the existing front-end through equivalent circuit analysis, quantitative analysis, and a phasor diagram representation. Based on the analysis of the existing front-ends and shipboard power architecture, lightweight and high-performance front-end is proposed and verified by simulation and prototype hardware. The performance, size comparison between existing front-end and the proposed front-end is provided to show the advantage of the proposed front-end.
El-Habrouk, Mohamed. "A new configuration for shunt active power filters." Thesis, Brunel University, 1998. http://bura.brunel.ac.uk/handle/2438/5241.
Full textWaite, Michael James. "Active power filter for unbalanced distribution networks using a flying-capacitor multi-level inverter." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.549738.
Full textLam, Chi Seng. "An adaptive low dc-voltage controlled LC coupling hybrid active power filter in three-phase four-wire power systems." Thesis, University of Macau, 2012. http://umaclib3.umac.mo/record=b2580608.
Full textTerciyanli, Alper. "Design And Implementation Of A Current Source Converter Based Active Power Filter For Medium Voltage Applications." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611767/index.pdf.
Full textAcharya, Beena Sivyakova. "Realization of high power active filter networks." 1989. http://catalog.hathitrust.org/api/volumes/oclc/20476082.html.
Full textTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 127-128).
Ming-Ta, Yang, and 楊明達. "Implementation of Digital Active Power Filter." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/27309731383038396886.
Full text國立雲林科技大學
電機工程技術研究所
86
Power electronics have been widely used in ac to dc converters. They own performances of fast response, small volume, and high efficiency, but serious power pollution is also introduced. Traditional solutions are using capacitor and inductor to make up passive filter for solving harmonics problem. To improve system power factor, a reactive power compensator is used to increase the power efficiency and reduce the transmission line loss. Active power filter not only has the properties of reactive power compensator but also simultaneously eliminate harmonic currents. The architecture of active power filter can be classified into series type, chopping type, dual power conversion type, and shunt type. This thesis presented two cases of study of the algorithm compensated-reference-current-computing and the current control techniques of shunt active power filter. There are two methods for the computing compensated reference current. For generating compensated currents three kinds of current control are used. Including 1) three-phase independent hysteresis band control 2) three-phase independent triangular carrier control 3) two-phase dependent d-q axis space vector control. This thesis studies the performance of steady state, dynamic response, and current harmonic spectrum distribution for both methods. The control algorithms are simulated using software SIMNON and tested by experimental prototype hardware based on TMS320C50 DSP. With the high performance DSP chips, most of complex computations can be accomplished in one sampling cycle.
Wang, Hsing-Liang, and 王興良. "A Novel Digital Active Power Filter." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/53443875569100134945.
Full text國立臺灣大學
電機工程學研究所
87
Recently, the equipment of power electronics have been widely used in industry. These nonlinear loads often produce a lot of harmonics and affect the quality of the power system. In order to reduce the harmonics, passive L-C filters have been widely used in recent years. Since many drawbacks have been observed in passive compensation methods, active power filters will be examined in this work. It is well known that active power filters can not only reduce the harmonic components, but also improve the power factor. It is rather common to have the active filters controlled by using a microprocessor (e.g. 80196KC ) or a digital signal processor (e.g. TDM320). Because personal computers are more and more popular and used widely on automatic control system, an active power filter based on personal computer is developed. In addition, the data acquisition boards of National Instruments and a specific computer language – LabVIEW are also applied in the thesis to eliminate the harmonics produced by power electronics and improve the power factor at the same time. The principle of the active power filter is described first. Then results from simulations and experiments are presented. It is found from the simulations and experimental results that the harmonic currents can be compensated and the power factor can be improved by the proposed active power filter.
Chien, Yuan-Bor, and 簡源伯. "Study of Three Phase Active Power Filter." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/09929416146281120884.
Full text國立雲林科技大學
電機工程系碩士班
89
As various of solid-state converters are found in a wide variety of end-use applications, voltage distortion and current harmonics produced by power electronics equipment has become a serious problem to be solved in many countries. Recently, active power filter appears to be an attractive method and is employed to replace the conventional passive LC filter for improving power quality. They are classified into shunt APF, series APF, combination of shunt and series APF, and hybrid APF. In this thesis, the basic compensation principles and control algorithms of these APFs are studied and analyzed. At last, simulations are made to confirm the validities of the control algorithm for these active power filters.
Chan, ZhaoMing, and 陳昭銘. "One Phase Multi-level Active Power Filter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/44100454809458020705.
Full text聖約翰科技大學
電機工程系碩士班
100
In recent years, nonlinear loads have such as switch-mode power supplies and motor drives have been applied in life widely. These nonlinear that result inharmonic currents and harmonic voltages have become serious problems for both utilities and customers. A shut active power filter based on power electronic technology has been proposed to eliminate harmonics and improve power factor simultaneously. In natural-point-clamp(NPC) structure based on the three-level-pulse width modulation scheme are studied. To compare with two-level-inverter, three-level-inverter gas the advantage of half voltage stress on switching devices for the same dc-link voltage and lower low-frequency harmonics at the same switching frequency. From the viewpoint of cost, the development of three-level inverter for high power drives has less cost than that of two-level inverter. The proposed three-level shunt active power filter is implemented and the experimental results verify the feasibility of system.
Huang, Hung-Wen, and 黃鴻文. "A Constant Power Based Switching Strategy for Active Power Filter." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/04288265377614934866.
Full text國立中央大學
電機工程學系
85
A new compensating strategy which is simple in concept andease- implemented in hardware would be introduced. That is, force the power system to draw constant power. By this fact,a novel idea is raised, that is, if we can control the utilitypower to source constant power(Of course, there imply that we have assumed the utility power a ideal sinusoidal voltage source), and the sinusoidal current in line frequency should also be obtained.
Shiu, Jeng-Jang, and 許政章. "Implementation and Verification of High Power Shunt Active Power Filter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/qjg6bf.
Full textLam, Ka-Lok, and 林嘉樂. "Study on Power Balance for Three-Phase Active Power Filter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/d4kcvn.
Full text國立交通大學
電機工程學系
106
This thesis is presented how three-phase shunt active power filter improve the current distortion caused by the non-linear load, and through its control system to solve the current unbalance and phase fault between three-phase power system. And also discuss when the energy combined to the three-phase power network, how to improve power factor, compensate reactive power at the same time, in another way, when phase fault or current unbalance in system, how system keeping output current normally. For the control method, through the line voltage signal feedback and digital phase-locked loop, system can track the phase voltage correctly , the traditional multi-loop feedback control include the DC bus voltage control and output current control, with the DC voltage feedback and input current feedback and, the active power filter can compensate reactive power and compensate improve power factor, also can keeping output current when phase fault happening in power source. Finally, the proposed control system is implemented in Texas Instruments DSP TMS320F28335 chip to realize the three-phase shunt active power filter control, and the provided simulation and experimental results shows that well performance of the target.
Muthu, Subramanian. "Analysis and control of unified active power filter." Thesis, 1998. https://dspace.library.uvic.ca//handle/1828/8790.
Full textGraduate
Chen, Shih-Kai, and 陳詩凱. "Implementation of a two-phase active power filter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/73119804194733331351.
Full text國立臺灣科技大學
電機工程系
96
The subject of this thesis is to implement a two-phase active power filter (APF) which employed Le Blanc connection transformer to transfer a three-phase source to a two-phase source. The control goals of the APF include eliminating harmonics in the line current, improving power factor of the system, and balancing the load currents of the two-phase source. TMS320F2812 is used as the core controller and some unbalanced nonlinear load are used in this thesis. By sensing the voltage and current signals, the DSP controller calculates the compensation currents for the two-phase source, and then determines the switching patterns with the hysteresis method. The single-phase semi-converter, which is the front power stage of most electric locomotive in Taiwan, is used as the nonlinear load in the proposed system. To deal with this kind of load, this thesis proposes a feedforward compensation that can improve the transient response of the APF during the accelerating and decelerating periods of the electric locomotives. Both simulation and experimental results show the effectiveness of the proposed system.
lin, Po-Hung, and 林柏宏. "Study of Active Power Filter with Adaptive Control." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/7fd353.
Full text國立成功大學
電機工程學系碩博士班
90
Recently, the problem of power quality aggravation caused by power harmonic produced because of power electronic equipments has been concerned. So this thesis is mainly focused on the improvement of harmonic problem to propose solution. The content in the thesis has two parts: the first is to add a parallel active power filter in system, whose function is to get the same scale and phase of nonlinear load through sensing equipment and then product the combination of the same scale but opposite phase by active filter to cancel the harmonic caused by nonlinear load. Because the phenomenon of signal delay will affect the result of tracking compensated current, in the second part of this thesis it also adds the adaptive control method to solve the above-mentioned problem. In this way it can get more correctly compensated current to improve the effect of harmonic cancellation.
Huang, Jhong-Wei, and 黃仲維. "A Shunt Active Power Filter for Harmonic Isolation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/47754233242281222953.
Full textChen, Chun-Cheng, and 陳俊丞. "Research of Three Phases Active Power Filter with Power Quality Improvement." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/16503633613437467540.
Full text國立雲林科技大學
電機工程系碩士班
95
Power pollution due to nonlinear loads will result in seriously power problem in power transmission and distribution systems. Therefore, this thesis is studied the Unified Power Quality Conditioner (UPQC) with Neutral Point Clamp(NPC) inverter. The functions of UPQC are inverters to improve power quality and to control power flow. The UPQC can achieve dynamic voltage adjustment, harmonic current elimination, active current compensation, and power factor improvement. Meanwhile, it can also achieve rapidly response at abnormal condition. The proposed control schemes are verified by the extensively simulation results.
Yang, Bor-ren, and 楊博仁. "Study and Implementation of Single Phase Active Power Filter." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/71312080866944420730.
Full text國立雲林科技大學
電機工程系碩士班
89
With the increasing concern over power quality (at both distribution and consumer levels) and the need to control harmonic, reactive power and voltage stability (at transmission levels), active power filters have attracted considerable interest in recent years. In this thesis, three categories of active power filter are presented. They are shunt active power filter, hybrid active power filter and shunt-series active power filter. Some simulations based on Matlab/Simulink are presented to demonstrate the performance of the adopted active power filter. Finally the hardware circuit consisted of the microprocessor 80196MC and some peripheral circuit are implemented to verify the proposed control scheme.
Wel, Tsung-Kuan, and 欉冠維. "Development Of Three Phase Multi-level Active Power Filter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/97889499763964823611.
Full text聖約翰科技大學
電機工程系碩士班
96
With the proliferation of nonlinar loads as diode/thyristor restifiers, nonsinusoidal currents degrade power quality in power transmission/distribution systems. Harmonics in power systems are becoming a serious problem for both utilities and customers. An active power filter using power electronic technology can reduce harmonics and improve power factor simultaneously. In this thesis, a feasibility study of shunt three-level power active filter is reported. Based on the traditional hysteresis current control switching technology for pulse width modulation scheme, a natural-point-clamp (NPC) structure is adapted. Compared with two-level inverters, three-level inverters have half the voltage stress on switching devices for the same dc-link voltage, and generate lower harmonics at the same switching frequency. The proposed three-level shunt active power filter is implemented and the experimental results verify the feasibility of the system and the correction of related analysis.
Tzung-ShianTsai and 蔡宗憲. "Study on Active Power Filter for Grid-Connected Inverter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/79435243837572442206.
Full text國立成功大學
電機工程學系
102
The purpose of this thesis is to implement the active power filter which can correct the output current of the grid-connected inverter. In order to mitigate the distortion and improve the efficiency of power transmission, the current fed to the grid should be corrected into a sinusoidal waveform. The circuit of the active power filter is using single phase full-bridge structure. The distortion component of current will be detected by the designed control system to obtain the compensation current command. The current closed-loop control scheme includes PI-controller and triangular carrier control, and the operating stage of active power filter will be changed to get the appropriate compensation current. The control circuit also generates a unity sinusoidal reference signal to make the corrected current to be inphase with mains voltage. The proposed active power filter is simulated by PSIM. A prototype circuit is implemented to show the effect of current correction.
Ai, Wen-Jei, and 艾文傑. "Development of Three Phase Multi-Function Active Power Filter." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/38925607280339893630.
Full text中原大學
電機工程研究所
89
The object of this thesis is to develop a multi-functional active power filter (APF) that can be multi-module parallel operation. The functions include compensation of the load current harmonics, reactive power and three-phase unbalanced currents aiming that the input currents are balanced with low distortion and the input power factor is unity. As for the control method, the synchronous-frame-based algorithm for reactive power compensation combined with the band-pass filter for harmonic current calculation is adopted for achieving a better filtering performance under the distorted voltage supply. A real power compensation technique is also proposed for balancing the unbalanced load currents. The cascaded series load current sensing method accompanying with the capacity-limitation control (including the reactive power capacity, harmonic current amplitude and unbalanced load power limitations) is employed to make multiple APFs can be paralleled without any control interconnection. A 3KVA APF system is implemented, the effectiveness of the proposed methods are proved in terms of some EMTP simulation and experimental results.
Li, Chien-Hsing, and 李建興. "A Shunt Active Power Filter Adopting Lyapunov Control Approach." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/97226794328213955465.
Full text雲林科技大學
工程科技研究所博士班
98
In this dissertation, a Lyapunov-based current control method is proposed for a single-phase shunt active power filter (APF) to reduce source current harmonics and reactive power. Most studies only show control block diagrams with classic control methods. These control schemes look very attractive for their simplicity and ease of implementation, but lack in presenting an adequate compensation algorithm or stability analysis of active power filters. The control law is derived from directly applying the Lyapunov stability theory to the integral controller, so that the closed-loop systems possess better harmonic current elimination. The proposed APF controller forces the supply current to be sinusoidal, with low current harmonics, and to be in phase with the line voltage. An experimental model of the active power filter has a power rating of 1 kW. The switching frequency of the active power filter is 20 kHz which can be produced by the electronic devices. The power factor is improved from 0.63 to 0.97 and the THD is reduced from 56% to 3.74% with a phase-angle controlled load. Computer simulations and experimental results obtained from a laboratory system developed in this dissertation verify the viability and effectiveness of the full-digital-controlled active filter. The features of the proposed system include: 1) the performance of the APF is much improved when adopting the Lyapunov stability approach. It is easy to select a suitable control gain to achieve stability compensation while maintaining the system stability. 2) Better harmonic compensation performance is obtained because the Lyapunov-based theory is used in the control algorithm, which is very important for active power filters to be used in practical applications.
Cheng, Po-Tai. "Use of dominant harmonic active filters in high power applications." 1999. http://catalog.hathitrust.org/api/volumes/oclc/44724942.html.
Full textTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 183-191).
Chen, Chin-Lin, and 陳金鈴. "An Active Power Filter Using Synchronous Detection Method for Unbalanced Power Systems." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/27282146591952397396.
Full text國立成功大學
電機工程研究所
83
This dissertation presents a new method, termed as the synchronous detection method, for active power filter to compensate the reactive and harmonic current in an unbalanced three-phase power system. Although the instantaneous power theory is powerful to operate an active filter, an assumption of balanced three-phase source voltage is required. Due to the inherent unbalanced characteristics in distribution feeder system , the synchronous detection method is proposed here to handle the unbalanced voltage to solve the reactive and harmonic current compensation problem. Three alternative methods using equal power , equal line current and equal resistance concept of the synchronous detection method are formulated. By simulation results, the performance of the synchronous detection method is proven to be improved. In this dissertation, results using the equal power, equal line current and equal resistance synchronous detection methods are shown. The d-q compensated component of instantaneous power theory is modified and reformulated for an unbalanced system , and its result is proven to be the same as that of equal resistance synchronous detection method. The formula of synchronous detection method can also be extended to multi- phase systems, such as four-system and six-phase system. System implementation using actual harmonic loads is also presented, as well as the test results. The merits of the proposed method are its capability to operate under unbalanced system by per-phase calculation, to avoid conversion error by force waveform calculation, and to implement in very simple manners. This dissertation has accomplished an active filter design for current compensation and load balancing in an unbalanced three-phase system.
WU, JIN-CHANG, and 吳晉昌. "A novel active power filter for reactive power compensation and harmonic suppression." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/49140932308585580991.
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