Relevant bibliographies by topics / THD reduction

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'THD reduction'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "THD reduction"

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Kim, Mihyang, Su-Il Kim, Jaehong Han, Xiu-Ling Wang, Dae-Geun Song, and Soo-Un Kim. "Stereospecific Biotransformation of Dihydrodaidzein into (3S)-Equol by the Human Intestinal Bacterium Eggerthella Strain Julong 732." Applied and Environmental Microbiology 75, no. 10 (March 20, 2009): 3062–68. http://dx.doi.org/10.1128/aem.02058-08.

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ABSTRACT Stereochemical course of isoflavanone dihydrodaidzein (DHD) reduction into the isoflavan (3S)-equol via tetrahydrodaidzein (THD) by the human intestinal anaerobic bacterium Eggerthella strain Julong 732 was studied. THD was synthesized by catalytic hydrogenation, and each stereoisomer was separated by chiral high-performance liquid chromatography. Circular dichroism spectroscopy was used to elucidate the absolute configurations of four synthetic THD stereoisomers. Rapid racemization of DHD catalyzed by Julong 732 prevented the substrate stereospecificity in the conversion of DHD into THD from being confirmed. The absolute configuration of THD, prepared by reduction of DHD in the cell-free incubation, was assigned as (3R,4S) via comparison of the retention time to that of the authentic THD by chiral chromatography. Dehydroequol (DE) was unable to produce the (3S)-equol both in the cell-free reaction and in the bacterial transformation, negating the possible intermediacy of DE. Finally, the intermediate (3R,4S)-THD was reduced into (3S)-equol by the whole cell, indicating the inversion of stereochemistry at C-3 during the reduction. A possible mechanism accounting for the racemization of DHD and the inversion of configuration of THD during reduction into (3S)-equol is proposed.
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Raharja, Lucky Pradigta Setiya, Ony Asrarul Q., Zainal Arief, and Novie Ayub Windarko. "Reduction of Total Harmonic Distortion (THD) on Multilevel Inverter with Modified PWM using Genetic Algorithm." EMITTER International Journal of Engineering Technology 5, no. 1 (July 23, 2017): 91–118. http://dx.doi.org/10.24003/emitter.v5i1.174.

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In this research, modified PWM has been applied to the multilevel inverter (MLI) single-phase three-level diode clamp full bridge. Modified PWM is performed to produce minimum Total Harmonic Distortion (THD) the voltage because the quality of the good voltage is indicated by small THD. The THD indicates the quality of AC voltage source. The THD standard by the IEEE STD 519-1992 Harmonic Voltage Limits is 5% and the Pacific Corp standard is 8%, if the THD value is greater than the THD standard it can cause the electronic load to be damaged due to the damaged waveform. Modified PWM is applied by adding a 50 Hz sinusoidal reference signal with a sinusoidal signal which has a certain amplitude, frequency and phase shift angle. The frequency of the adder signal is the frequency at which the value of the individual harmonic voltage appears (n harmonic). To get maximum result, optimization using Genetic Algorithm (GA) method to determinate amplitude & phase shift angle done. The result of implementation hardware with modified PWM shows smaller THD voltage compared to the THD voltage with Sinusoidal Pulse Width Modulation (SPWM) switching up to 0.19 or decrease 65,51 % for modified PWM of harmonic injection n = 7 with GA optimization ma= 0.8 (A=0.0936 and ø = 0 rad) and up to 0.08 or decrease 12,30 % for modified PWM of harmonic injection n = 22 with GA optimization ma = 0.4 (A=0.1221 and ø = 0 rad).
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Fedin, Ihor Serhiiovych, Tetiana Oleksandrivna Tereshchenko, and Yuliia Serhiivna Yamnenko. "THD Reduction of Inverters in Photovoltaic Power Systems." Microsystems, Electronics and Acoustics 25, no. 2 (August 31, 2020): 18–24. http://dx.doi.org/10.20535/2523-4455.mea.207543.

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El Mehdi Belkacem, Riadh, Redha Benzid, and Noureddine Bouguechal. "Multilevel inverter with optimal THD through the firefly algorithm." Archives of Electrical Engineering 66, no. 1 (March 1, 2017): 141–54. http://dx.doi.org/10.1515/aee-2017-0010.

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Abstract Reduction of the Total Harmonic Distortion (THD) in multilevel inverters requires resolution of complex nonlinear transcendental equations; in this paper we propose a combination of one of the best existing optimized hardware structures with the recent firefly algorithm, which was used to optimize the THD, through finding the best switching angles and guaranteeing the minimization of harmonics within a user defined bandwidth. The obtained THD through the simulation of the thirteen-level symmetric inverter has been reduced down to 5% (FFT of 60 harmonics). In order to validate the simulation results, a thirteen-level symmetric inverter prototype has been made, and practically experimented and tested with different loads. Consequently, the measured THD with resistive load was 4.7% on a bandwidth of 3 kHz. The main advantage of the achieved work is the reduction of the THD.
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Sood, Rajbir, and Geena Kalpesh. "THD Reduction and Power Quality Improvement in Grid Connected PV System." International Journal of Trend in Scientific Research and Development Volume-1, Issue-4 (June 30, 2017): 429–33. http://dx.doi.org/10.31142/ijtsrd173.

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Apelfröjd, S., and S. Eriksson. "Evaluation of Harmonic Content from a Tap Transformer Based Grid Connection System for Wind Power." Journal of Renewable Energy 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/190573.

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Simulations done in MATLAB/Simulink together with experiments conducted at the Ångströms laboratory are used to evaluate and discuss the total harmonic distortion (THD) and total demand distortion (TDD) of a tap transformer based grid connection system. The grid connection topology can be used with different turbine and generator topologies and is here applied on a vertical axis wind turbine (VAWT) with a permanent magnet synchronous generator (PMSG) and its operational scheme. The full variable-speed wind conversion system consists of a diode rectifier, DC link, IGBT inverter, LCL-filter, and tap transformer. The full variable-speed operation is enabled by the use of the different step-up ratios of the tap transformer. In the laboratory study, a full experimental setup of the system was used, a clone of the on-site PMSG driven by a motor was used, and the grid was replaced with a resistive load. With a resistive load, grid harmonics and possible unbalances are removed. The results show a TDD and THD below 5% for the full operating range and harmonic values within the limits set up by IEEE-519. Furthermore, a change in tap, going to a lower step-up ratio, results in a reduction in both THD and TDD for the same output power.
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Lee, Chung-Seong, and Hae-Joong Kim. "Induced EMF THD Reduction Design of Permanent Magnet Synchronous Generators for Diesel Engine Generators." Processes 9, no. 6 (June 3, 2021): 986. http://dx.doi.org/10.3390/pr9060986.

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This paper deals with design of permanent magnet synchronous generators (PMSG) for diesel engine generators. The PMSG is required to reduce the total harmonic distortion (THD) reduction of the induced electromotive force (EMF) for the enhancement of power quality. In this paper, a design method is proposed to reduce the THD of the induced EMF for power quality enhancement in the PMSG. First, the selection process for the number of poles and slots is described. Second, the rotor shape design is proposed using an eccentric curve and slit shape. Based on the results of the first process, the optimal rotor shape is selected to achieve the additional THD reduction of the induced EMF. Finally, the performance for the optimal rotor shape is verified through a 2-dimensional finite element analysis (2D FEA) and prototype.
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Moriano, Javier, Mario Rizo, Emilio Bueno, J. Rafael Sendra, and Raul Mateos. "Distortion-Free Instantaneous Multifrequency Saturator for THD Current Reduction." IEEE Transactions on Industrial Electronics 66, no. 7 (July 2019): 5310–20. http://dx.doi.org/10.1109/tie.2018.2868317.

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Mathew, Megha Jess. "THD Reduction in Multilevel Inverters Using Real-Time Algorithm." IOSR Journal of Computer Engineering 8, no. 2 (2012): 01–12. http://dx.doi.org/10.9790/0661-0820112.

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Alves de Lima Henn, Gustavo, Paulo Peixoto Praça, R. N. A. L. Silva, Demercil de Souza Oliveira Júnior, Luiz Henrique Silva Colado Barreto, and Edison Roberto Cabral da Silva. "Adapted Modulation For Thd Performance Improvement And Losses Reduction On Multilevel Inverters." Eletrônica de Potência 16, no. 2 (May 1, 2011): 103–9. http://dx.doi.org/10.18618/rep.2011.2.103109.

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Dissertations / Theses on the topic "THD reduction"

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Zhang, Di. "Analysis and Design of Paralleled Three-Phase Voltage Source Converters with Interleaving." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/27579.

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Three-phase voltage source converters(VSCs) have become the converter of choice in many ac medium and high power applications due to their many advantages, including low harmonics, high power factor, and high efficiency. Modular VSCs have also been a popular choice as building blocks to achieve even higher power, primarily through converter paralleling. In addition to high power ratings, paralleling converters can also provide system redundancy through the so-called (N+1) configuration for improved availability, as well as allow easy implementation of converter power management. Interleaving can further improve the benefit of paralleling VSCs by reducing system harmonic currents, which potentially can increase system power density. There are many challenges to implement interleaving in paralleled VSCs system due to the complicated relationships in a three-phase power converter system. In addition, to maximize the benefit of interleaving, current knowledge of symmetric interleaving is not enough. More insightful understanding of this PWM technology is necessary before implement interleaving in a real paralleled VSCs system. In this dissertation, a systematic methodology to analyze and design a paralleled three-phase voltage source converters with interleaving is developed. All the analysis and proposed control methods are investigated with the goal of maximizing the benefit of interleaving based on system requirement. The dissertation is divided into five sections. Firstly, a complete analysis studying the impact of interleaving on harmonic currents in ac and dc side passive components for paralleled VSCs is presented. The analysis performed considers the effects of modulation index, pulse-width-modulation (PWM) schemes, interleaving angle and displacement angle. Based on the analysis the method to optimize interleaving angle is proposed. Secondly, the control methods for the common mode (CM) circulating current of paralleled three-phase VSCs with discontinuous space-vector modulation (DPWM) and interleaving are proposed. With the control methods, DPWM and interleaving, which is a desirable combination, but not considered possible, can be implemented together. In addition, the total flux of integrated inter-phase inductor to limit circulating current can be minimized. Thirdly, a 15 kW three phase ac-dc rectifier is built with SiC devices. With the technologies presented in this dissertation, the specific power density can be pushed more than 2kW/lb. Fourthly, the converter system with low switching frequency is studied. Special issues such as beat phenomenon and system unbalance due to non-triplen carrier ratio is explained and solved by control methods. Other than that, an improved asymmetric space vector modulation is proposed, which can significantly reduce output current total harmonic distortion (THD) for single and interleaved VSCs system. Finally, the method to protect a system with paralleled VSCs under the occurrence of internal faults is studied. After the internal fault is detected and isolated, the paralleled VSCs system can continue work. So system reliability can be increased.
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Jihad, Hamza El. "Contribution à l'étude des convertisseurs multi-niveaux moyenne tension : réduction d'harmoniques BF et linéarisation de leur tension." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0175.

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Cette thèse traite des convertisseurs de puissance multi-niveaux destinés aux applications d’entraînements électriques, utilisés notamment dans le domaine de l’Oil & Gas et de la propulsion marine, ou bien aux applications réseaux comme la compensation de l’énergie réactive. L’objectif est l’optimisation des commandes de ces convertisseurs de façon à réduire le contenu harmonique de la tension de sortie et donc du courant, paramètre très important pour le dimensionnement à la fois des filtres de sortie et des machines électriques qui y sont connectées. Dans la première partie de ce mémoire, les différentes topologies multi-niveaux sont analysées et trois topologies cinq niveaux retenues sont comparées en termes de nombre de composants semi-conducteurs, des pertes, du contenu harmonique et de l’énergie stockée dans les éléments passifs. Selon le type de l’application, l’une d’entre elles est préférée aux autres. En deuxième partie, nous avons proposé une méthode de réduction d’harmoniques basse fréquence qui consiste à maîtriser la phase des porteuses MLI pour des ratios entiers des fréquences de découpage et du fondamentale de la tension de référence. La minimisation des harmoniques basse fréquence de la tension de sortie du convertisseur par l’optimisation de la phase des porteuses est validée d’abord par des simulations numériques puis implémentée pratiquement et validée à l’aide d’un simulateur temps réel RT-Lab. Pour pallier aux problèmes de non-linéarités introduites par les méthodes classiques de ”clamping” des tensions de références des convertisseurs multi-niveaux, limitant l’amplitude de la tension de sortie maximale atteignable, nous proposons une nouvelle méthode de linéarisation en dernière partie de ce mémoire. Il s’agit d’ajouter une composante homopolaire optimisée aux tensions de références des convertisseurs multi-niveaux pour linéariser le fondamental de leurs tensions de sortie, ce qui permet d’accroître le maximum de leur amplitude. Cette méthode est testée par simulation numérique dans la commande d’un système d’entraînement électrique complet lui permettant de fonctionner sur toute la plage de vitesse, sans affecter l’équilibrage des tensions des capacités du bus continu principal
This thesis deals with multi-level power converters for electrical drive applications, used in particular in the field of Oil & Gas and marine propulsion, or for network applications such as reactive energy compensation. The objective is to optimize the controls of these converters in order to reduce the harmonic content of the output voltage and therefore of the current, a very important parameter for the sizing of both the output filters and the electrical machines connected to them. In the first part of this thesis, the different multi-level topologies are analyzed and three selected five-level topologies are compared in terms of the number of semiconductor components, losses, harmonic content and the energy stored in the passive elements. Depending on the application type, one of them is preferred over the others. In the second part, we proposed a method for reducing low frequency harmonics of the multilevel converter output voltage, which consists in controlling the phase of the PWM carriers for integer ratios of the switching frequency and the fundamental frequency. The minimization of low-frequency harmonics of the converter output voltage by optimizing the carrier phase is first validated by numerical simulations and then practically implemented and validated using a real time simulator RT-Lab. To overcome the problems of non-linearities introduced by the classical clamping methods of the reference voltages of multi-level converters, limiting the amplitude of the maximum achievable output voltage, we propose a new linearization method in the last part of this thesis. This involves adding an optimized zero-sequence component to the reference voltages of multi-level converters to linearize the fundamental of their output voltages, which makes it possible to increase their amplitude to its maximum achievable value. This method is tested by numerical simulation in the control of a complete electric drive system allowing it to operate over the entire speed range, without affecting the voltage balancing of the main DC bus capacitors
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Vamulapalli, Harika Rao. "On Dimensionality Reduction of Data." ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1211.

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Random projection method is one of the important tools for the dimensionality reduction of data which can be made efficient with strong error guarantees. In this thesis, we focus on linear transforms of high dimensional data to the low dimensional space satisfying the Johnson-Lindenstrauss lemma. In addition, we also prove some theoretical results relating to the projections that are of interest when applying them in practical applications. We show how the technique can be applied to synthetic data with probabilistic guarantee on the pairwise distance. The connection between dimensionality reduction and compressed sensing is also discussed.
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Khan, Wajid. "Energy reduction in the pultrusion and the rotational moulding processes." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/energy-reduction-in-the-pultrusion-and-the-rotational-moulding-processes(39f3af53-a68a-4f35-8543-3aba13ec6fca).html.

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This work embraces two different manufacturing processes: pultrusion androtational moulding. One (pultrusion) is concerned with manufacture with athermosetting composite while the other is concerned with manufacture of anunfilled thermoplastic. The connecting theme is one of energy usage in manufacturewith these processes. While a large number of comprehensive computer models of pultrusion havebeen generated, most are focussed on the prediction of the temperature andconversion distributions within the profile; by contrast, the analysis presented here isdirected towards the prediction of the duty cycle of the mould heaters as a first stepin recognising the significance of the energy consumed in the process. The results ofthe model are compared with experimental measurements of the duty cycle of anindustrial machine. The nature of this particular investigation was predominantlyapplied and in particular directed towards industrial use. For this reason, the modelwas created in MATLAB, a software package which is relatively more accessible tothe reinforced plastics industry than FE packages. The project involved extensivemodelling and experimentation. It is shown that the line speed could be increased significantly by preheatingthe profile before it enters the die. For example, line speed for one particular profilewas increased from 0.4m/min to 0.5 m/min by using a pre-heater set at 80°C. Thiswork also showed that the specific energy consumption of the process was 0.2kWh/kg to 0.3 kWh/kg; under different line speeds and operating conditions. Thiswas achieved by measuring the duty cycle of the heaters on the die. This increase inline speed means a saving of up to 30 % of the specific energy consumption in thepultrusion. The energy theme continues through the work on rotational moulding. It isshown that the specific energy consumption in rotational moulding can be reducedby up to 70% by direct heating of the mould by using electrical resistance heatersinstead of current method of using hot air to heat the mould. The finite elementmodel showed that this alternative heating method is capable of producing asuniform a heat distribution on the surface of the mould as the current heating systemby using cyclic heating.
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Gordon, Keith. "MACT Implementation at an Organic Chemical Manufacturing Facility: Human Health Risk Reduction." ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1222.

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Human health risk assessments are used by environmental regulatory agencies to determine risk from Hazardous Air Pollutants (HAPs). In this study, the Human Exposure Model (HEM-3) was used to compare the cancer and non-cancer inhalation health effects of a single organic chemical manufacturing facility in Geismar, Louisiana prior to and after Maximum Achievable Control Technologies (MACT) were implemented. The results indicate significant reductions in both cancer risk and non-cancer hazards. The analysis also indicated that the equivalent cancer risk reduction could have been achieved by addressing MACT in only one production process and one single pollutant (ethylene dichloride) within that process. This demonstrates the value that these risk assessments have at evaluating emissions at the facility level, and how they could be used in the control strategy decision making process.
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Balachandran, Nandu. "Utilization of Distributed Generation in Power System Peak Hour Load Shedding Reduction." ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2124.

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An approach to utilize Distributed Generation (DG) to minimize the total load shedding by analyzing the power system in Transactive energy framework is proposed. An algorithm to optimize power system in forward and spot markets to maximize an electric utility’s profit by optimizing purchase of power from DG is developed. The proposed algorithm is a multi-objective optimization with the main objective to maximize a utility’s profit by minimizing overall cost of production, load shedding, and purchase of power from distributed generators. This work also proposes a method to price power in forward and spot markets using existing LMP techniques. Transactive accounting has been performed to quantify the consumer payments in both markets. The algorithm is tested in two test systems; a 6-bus system and modified IEEE 14-bus system. The results show that by investing in DG, utility benefits from profit increase, load shedding reduction, and transmission line loading improvement.
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Williamson, Edwin Ferebee. "A comparison of the post-Cold War Defense budget reduction to prior post-conflict reductions after World War II, Korea and Vietnam." Thesis, Monterey, California. Naval Postgraduate School, 1993. http://hdl.handle.net/10945/40012.

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Approved for public release; distribution is unlimited.
This thesis compares the current drawdown in defense budgets to those which occurred after World War II, Korea and Vietnam. Bach post-conflict period is examined with respect to the Department of Defense and Department of the Navy, comparing the degree and rate of reductions in budgets, manning and ships. There are three principle conclusions drawn from the research. First, that President Eisenhower was uniquely successful among post-conflict Presidents in maintaining the balance between force levels and funding during post-conflict drawdowns. Second, that the post-Vietnam 'hollow forces' occurred when funding was insufficient in the face of inflation to sustain the change to the all volunteer force. Third, that early signs in the current reduction point to the possibility of similar difficulties in balancing reductions in forces and budgets.
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Sutton, Patrick James. "The dimensional-reduction anomaly." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ59681.pdf.

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Satter, Kurt. "Competitive Usability Studies of Virtual Environments for Shipbuilding." ScholarWorks@UNO, 2006. http://scholarworks.uno.edu/td/331.

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Establishing usability specifications as measurable attributes in repeatable scenarios has been an essential task in the management and continuous improvement processes [1]. Early studies in Usability Analysis were primarily conducted to assist software developers and hardware designers in improving the Human- Computer Interface (HCI) or Man- Machine Interface (MMI). However, this study was conducted to provide comparative data supporting broad conclusions regarding the comparative merits of one technology (nonstereoscopic, conventional CAD systems) competed against another (tracked, stereoscopic virtual environments). Competing environments to establish usability features and preferences provides a new tool to the interface designer. Benchmark scenarios were designed and executed to measure navigation, fault identification/repair, and spatial awareness through a sequence of choices and to provide user preference of one GUI paradigm over another functionally similar paradigm. This study, performed on a ship design application, included an analysis of the effects of user collaboration in virtual environments.
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Khalil, Mostafa Khalil. "The contribution of Islamic-based CSOs to poverty reduction in Egypt : the mechanisms, the politics and the lessons." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/the-contribution-of-islamicbased-csos-to-poverty-reduction-in-egypt-the-mechanisms-the-politics-and-the-lessons(85b282bf-6129-460a-9a6c-a0ea6083a55e).html.

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This thesis provides a critical analysis of how Islamic-based Civil Society Organisations (IBCSOs) contribute to poverty reduction in Egypt, through a qualitative study of four Civil Society Organisations (CSOs). The thesis closely examines case study IBCSOs’ organisational structures, their activities and the values that shape their conceptualisation of poverty. It reveals the similarities between IBCSOs’ poverty reduction work and official social protection, and discusses how their approaches to poverty reduction can be understood in terms of the various discourses justifying social protection (risks, rights and needs). The thesis also uses these case studies to examine the validity of Faith-Based Organisations (FBOs) as vehicles for poverty reduction and social protection. Finally, it discusses the relationship between these organisations’ poverty reduction activities and political mobilisation through an examination of the role they played in the recent political rise of the Islamist movement in Egypt, as well as the impact of recent political developments on their operations. A key purpose of this critical investigation of IBCSOs' approaches to poverty reduction is to explore more broadly their wider implications for development theory and practice by assessing whether they can contribute to existing knowledge on the means of civil society’s contribution to poverty reduction and development.
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Books on the topic "THD reduction"

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Peer, Philip van. The Levallois reduction strategy. Madison, Wis: Prehistory Press, 1992.

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The age reduction system. New York: Rawson Associates, 1986.

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van Riel, Raphael. The Concept of Reduction. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04162-9.

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Betteridge, D. J. The cholesterol reduction controversy. Surrey: Synergy Medical Education, 1993.

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The Luskville reductions. London, Ont: Brick Books, 2008.

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Taminiaux, Jacques. The metamorphoses of phenomenological reduction. Milwaukee, Wis: Marquette University Press, 2004.

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Robbins, Eshelman Elizabeth, and McKay Matthew, eds. The relaxation & stress reduction workbook. 5th ed. Oakland, CA: New Harbinger Publications, 2000.

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Psychoneural reduction: The new wave. Cambridge, Mass: MIT Press, 1998.

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Committee, Organisation for Economic Co-operation and Development Development Assistance. The DAC guidelines: Poverty reduction. Paris: OECD, 2001.

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Robbins, Eshelman Elizabeth, and McKay Matthew, eds. The relaxation & stress reduction workbook. 3rd ed. Oakland, CA: New Harbinger Publications, 1988.

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Book chapters on the topic "THD reduction"

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Panigrahi, Suraj Kumar, Renu Sharma, and Satyanarayan Bhuyan. "THD Reduction of On-Grid Solar Photovoltaic System Employing SPWM Technique." In Lecture Notes in Electrical Engineering, 425–37. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2305-2_34.

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Manjesh, Nilima Siddhartha Dabhade, Amik Garg, and Akash Kumar Bhoi. "Reduction of THD in Nine-Phase Induction Motor Drive with CLC Filter." In Advances in Power Systems and Energy Management, 23–31. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4394-9_3.

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Kadali, Renu, and Srinivasa Rao Jalluri. "Design and Simulation of Boost Converter for Correction of Power Factor and THD Reduction." In Lecture Notes in Electrical Engineering, 361–69. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7329-8_37.

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Castan, Michel, Guy Durrieu, Bernard Lecussan, Michel Lemaître, Alessandro Contessa, Eric Cousin, and Paulino Ng. "Toward the design of a parallel graph reduction machine the MaRS project." In Graph Reduction, 160–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/3-540-18420-1_54.

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Harrison, P. G., and M. J. Reeve. "The parallel graph reduction machine, ALICE." In Graph Reduction, 181–202. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/3-540-18420-1_55.

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Khasidashvili, Zurab. "The longest perpetual reductions in Orthogonal Expression Reduction Systems." In Logical Foundations of Computer Science, 191–203. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/3-540-58140-5_20.

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Oberhauser, Hans-Georg. "On the correspondence of lambda style reduction and combinator style reduction." In Graph Reduction, 1–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/3-540-18420-1_47.

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Berkling, Klaus. "Head order reduction: A graph reduction scheme for the operational lambda calculus." In Graph Reduction, 26–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/3-540-18420-1_48.

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Kraft, James. "Reduction." In The Epistemology of Religious Disagreement, 129–53. New York: Palgrave Macmillan US, 2012. http://dx.doi.org/10.1057/9781137015105_9.

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Agrachev, Andrei A., and Yuri L. Sachkov. "Reduction." In Control Theory from the Geometric Viewpoint, 355–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-06404-7_22.

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Conference papers on the topic "THD reduction"

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Joca, Davi R., Luiz H. S. C. Barreto, Denercil de S. Oliveira, Paulo P. Praca, Ranoyca N. A. L. Silva, and Gustavo A. L. Henn. "THD analysis of a modulation technique applied for THD reduction." In 2013 Brazilian Power Electronics Conference (COBEP 2013). IEEE, 2013. http://dx.doi.org/10.1109/cobep.2013.6785112.

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Badawy, Mohamed, Adeeb Ahmed, Yilmaz Sozer, and Ping Yi. "Active THD reduction strategy for grid connected EV charging stations." In 2013 IEEE Energytech. IEEE, 2013. http://dx.doi.org/10.1109/energytech.2013.6645289.

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Salgado-Herrera, N. M., O. Anaya-Lara, D. Campos-Gaona, A. Medina-Rios, R. Tapia-Sanchez, and J. R. Rodriguez-Rodriguez. "Active Front-End converter applied for the THD reduction in power systems." In 2018 IEEE Power & Energy Society General Meeting (PESGM). IEEE, 2018. http://dx.doi.org/10.1109/pesgm.2018.8586414.

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Shahina, E. P., K. Aravind, and T. Jarin. "THD Reduction in Execution of A Nine Level Single Phase Inverter." In 2020 International Conference on Communication and Signal Processing (ICCSP). IEEE, 2020. http://dx.doi.org/10.1109/iccsp48568.2020.9182178.

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Jasper, S. Sherin, and K. Priyanka. "Analysis & reduction Of THD In multilevel inverter using PSO algorithm." In 2014 International Conference on Green Computing Communication and Electrical Engineering (ICGCCEE). IEEE, 2014. http://dx.doi.org/10.1109/icgccee.2014.6922430.

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Barreto, L. H. S. C., G. A. L. Henn, P. P. Praca, R. N. A. L. Silva, D. S. Oliveira, and E. R. C. da Silva. "Carrier-based PWM modulation for THD and losses reduction on multilevel inverters." In 2012 IEEE Applied Power Electronics Conference and Exposition - APEC 2012. IEEE, 2012. http://dx.doi.org/10.1109/apec.2012.6166163.

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Tadivaka, Tejasreenu, M. Srikanth, and T. Vijay Muni. "THD reduction and voltage flicker mitigation in power system base on STATCOM." In 2014 International Conference on Information Communication and Embedded Systems (ICICES). IEEE, 2014. http://dx.doi.org/10.1109/icices.2014.7034161.

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Durgasukumar, G., and M. K. Pathak. "THD reduction in performance of multi-level inverter fed induction motor drive." In 2010 India International Conference on Power Electronics (IICPE). IEEE, 2011. http://dx.doi.org/10.1109/iicpe.2011.5728116.

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Le, Hoai Nam, and Jun-ichi Itoh. "Current THD reduction for grid-connected inverter operating in discontinuous current mode." In 2016 IEEE International Conference on Sustainable Energy Technologies (ICSET). IEEE, 2016. http://dx.doi.org/10.1109/icset.2016.7811794.

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Joca, Davi R., Allan U. Barbosa, Demercil S. Oliveira, Paulo P. Praca, Luiz H. S. C. Barreto, and Ranoyca N. A. L. Silva. "Analysis of a modulation technique applied to FC inverter for THD reduction." In 2015 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2015. http://dx.doi.org/10.1109/apec.2015.7104664.

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Reports on the topic "THD reduction"

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McKinney, Terry L., Timothy E. Moore, Robert E. Bender, Steven I. Case, Cheryl L. Snyder, Karen A. Ulatowski, David P. Goodykoontz, Kevin G. Burrowes, Breon E. Dehoux, and Theresa L. Tameris. Cooperative Threat Reduction: Contracts Awarded by the Defense Threat Reduction Agency in Support of the Cooperative Threat Reduction Program. Fort Belvoir, VA: Defense Technical Information Center, August 2004. http://dx.doi.org/10.21236/ada433189.

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Maloney, Daniel M. The Emission Reduction Planning Model. Fort Belvoir, VA: Defense Technical Information Center, November 1999. http://dx.doi.org/10.21236/ada378579.

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Raney, E. A., J. J. Hogan, M. L. McCollom, and R. J. Meyer. The reduction of packaging waste. Office of Scientific and Technical Information (OSTI), April 1994. http://dx.doi.org/10.2172/10171030.

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Spano, Christian, Paolo Natali, Charles Cannon, Suzanne Greene, Osvaldo Urzúa, Carlos Sucre, and Adriana Unzueta. Latin America and the Caribbean 2050: Becoming a Global Low-Carbon Metals and Solutions Hub. Inter-American Development Bank, July 2021. http://dx.doi.org/10.18235/0003412.

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This report evaluates scope 3 emissions along the copper and iron ore value chains and the opportunities that Latin America and the Caribbean (LAC) has to become a low carbon metals and solutions hub. The report presents four carbon emission scenarios that represent different sets of decisions for policy-makers and investors. Two scenarios fall short of aligning with Paris targets: (1) the business as usual (BaU) scenario with no further abatement action; and (2) a BaU scenario with the current level of emission reduction potential from players in the value chain (BaU Possible). The other two scenarios deliver the required carbon reductions to be compliant with the Paris Agreement by 2060, but through different strategies: (3) the BaU Paris scenario. where alignment with Paris targets is achieved by keeping BaU volumes and reducing carbon intensity per tonne of metal; and (4) the Decoupled scenario, where carbon intensity reductions are relaxed and compensated by a reduction in primary supply to align the value chain emissions to a Paris trajectory. All scenarios require LACs leaders to consider investments in low-carbon technology in different degrees. The report argues that, given its competitive position in the cost curve for copper and iron ore and an abundance of enabling factors for low carbon strategies, the region could become a key source of low carbon metals and solutions as long as it is proactive in adopting all the necessary measures from public sector and industry perspectives. Finally, the report concludes that myriad opportunities exist for LAC, including new business models, technologies and products, and that these could yield a greater economic and social contribution to the region than the BaU trajectories.
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Hinckley, C. M., and P. Barkan. Selecting the best defect reduction methodology. Office of Scientific and Technical Information (OSTI), April 1994. http://dx.doi.org/10.2172/10169855.

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Warwick, Ross, Yani Tyskerud, Ian Mitchell, and Sam Hughes. The UK’s reduction in aid spending. Institute for Fiscal Studies, April 2021. http://dx.doi.org/10.1920/bn.ifs.2021.bn0322.

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Hedley, W. H., F. S. Adams, and J. E. Wells. Human factors engineering for the TERF (Tritium Emissions Reduction Facility) project. [Tritium Emissions Reduction Facility]. Office of Scientific and Technical Information (OSTI), December 1990. http://dx.doi.org/10.2172/6345684.

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Boehm, Robert, Sean Hsieh, Joon Lee, Yahia Baghzouz, Andrew Cross, and Sarah Chatterjee. Dramatic Demand Reduction In The Desert Southwest. Office of Scientific and Technical Information (OSTI), July 2015. http://dx.doi.org/10.2172/1222582.

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Sandvik, Jason, Richard Saouma, Nathan Seegert, and Christopher Stanton. Analyzing the Aftermath of a Compensation Reduction. Cambridge, MA: National Bureau of Economic Research, October 2018. http://dx.doi.org/10.3386/w25135.

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Allen, Luke, Joon Lim, Robert Haehnel, and Ian Dettwiller. Helicopter rotor blade multiple-section optimization with performance. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/41031.

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This paper presents advancements in a surrogate-based, rotor blade design optimization framework for improved helicopter performance. The framework builds on previous successes by allowing multiple airfoil sections to designed simultaneously to minimize required rotor power in multiple flight conditions. Rotor power in hover and forward flight, at advance ratio 𝜇 = 0.3, are used as objective functions in a multi-objective genetic algorithm. The framework is constructed using Galaxy Simulation Builder with optimization provided through integration with Dakota. Three independent airfoil sections are morphed using ParFoil and aerodynamic coefficients for the updated airfoil shapes (i.e., lift, drag, moment) are calculated using linear interpolation from a database generated using C81Gen/ARC2D. Final rotor performance is then calculated using RCAS. Several demonstrative optimization case studies were conducted using the UH-60A main rotor. The degrees of freedom for this case are limited to the airfoil camber, camber crest position, thickness, and thickness crest position for each of the sections. The results of the three-segment case study show improvements in rotor power of 4.3% and 0.8% in forward flight and hover, respectively. This configuration also yields greater reductions in rotor power for high advance ratios, e.g., 6.0% reduction at 𝜇 = 0.35, and 8.8% reduction at 𝜇 = 0.4.
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