Relevant bibliographies by topics / NPC three level converters

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Academic literature on the topic 'NPC three level converters'

Author: Grafiati
Published: 4 June 2025
Last updated: 23 June 2025

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Journal articles on the topic "NPC three level converters"

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Hussain, Shafquat, Simone Cosso, Massimiliano Passalacqua, Luis Ramon Vaccaro, Andrea Formentini, and Mario Marchesoni. "Efficiency Performance of 7-Level Multiplexed and 3-Level Neutral Point Clamped (NPC) Converters." Energies 18, no. 9 (2025): 2161. https://doi.org/10.3390/en18092161.

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In medium-voltage AC applications, multilevel converters are essential due to their ability to achieve high efficiency and significantly reduce total harmonic distortion (THD), ensuring improved performance and power quality. This paper presents a detailed analysis of the efficiency, power loss, and THD characteristics of multiplexed multilevel converters and neutral point clamped converters. Using MATLAB®Simulink 2024b, the switching and conduction losses of both multiplexed multilevel converters and NPC converters are calculated. The three-level NPC converter offers advantages of a simpler design, reduced component count, and cost effectiveness with the drawback of low voltage quality. Simulation results validate the THD, power losses, and efficiency for the conventional three-phase three-level NPC converter and the three-phase multiplexed multilevel converter, and a detailed comparison is performed.
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Vagner Rocha, Anderson, Gleisson Jardim França, Manoel Eustáquio dos Santos, Hélder de Paula, and Braz de Jesus Cardoso Filho. "A Fault-resilient Implementation Of Three Level Npc Igct-based Converters." Eletrônica de Potência 16, no. 2 (2011): 168–76. http://dx.doi.org/10.18618/rep.2011.2.168176.

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Peng, Xi, Sheng Yin, and Yingqin Zou. "Research on dynamic current sharing method of parallel connected IGBT modules for NPC three level converters." Journal of Physics: Conference Series 2113, no. 1 (2021): 012055. http://dx.doi.org/10.1088/1742-6596/2113/1/012055.

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Abstract The parallel connection of IGBTs has been being applied in high power neutral point clamped (NPC) three level converters. This paper investigates the impact of gate parameters (gate resistor and capacitance) on dynamic current imbalance of parallel connected IGBT for NPC three level converter. A gate parameters calculation method is proposed in the paper, and the delay time and collector current difference can be analysed quantitatively. Experimental results have shown the effectiveness of the method.
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Wang, Ziying, Ning Jiao, Shunliang Wang, Junpeng Ma, Rui Zhang, and Tianqi Liu. "Quantitative Analysis of Balancing Range for Single-Phase 3L-NPC Converters." Energies 17, no. 6 (2024): 1464. http://dx.doi.org/10.3390/en17061464.

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Multiple techniques have been suggested to achieve control balance in single-phase three-level neutral-point clamped (3L-NPC) converters. Nevertheless, there is a deficiency of quantitative calculations related to the extent of balancing. Operating beyond the balancing range may result in a sequence of safety incidents. This paper presents a conceptualization of the 3L-NPC converter as two cascaded H-bridges. By employing power conservation principles, the balancing range for the NPC converter is derived, and two novel methods are investigated to broaden the balance range in accordance with the calculated balance range. A comparison is made among the balancing ranges under different balancing control methods. This study establishes a theoretical foundation to ensure the secure and stable operation of the NPC converter.
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Maklakov, Aleksandr S., and Ivan N. Erdakov. "Study of Behavior of Voltage and Current Spectra of Three-Level Neutral Point Clamped Converter at Selected Harmonic Elimination Programmed Pulse Pattern Pulse-Width Modulation." Energies 16, no. 13 (2023): 5183. http://dx.doi.org/10.3390/en16135183.

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The issue of converted voltage distortion by high-power converters at pulse-width modulation (PWM) with a low switching frequency of semiconductor modules is still relevant. Currently, the Programmed Pulse Pattern PWM (PPWM) technique is used extensively that allows pre-eliminating the selected harmonics from the converter’s voltage and current spectrum or reducing them to meet the voltage quality standard requirements. A review of scientific publications has shown the insufficiency of available studies on defining and estimating the impact of powerful converters with PPWM. The problem of defining the amplitudes of higher harmonics generated by a converter with PPWM, which are the main cause of electronic equipment failures at the common grid connection point, is particularly relevant. This study considers the behavior of the NPC converter voltage and current spectra at PPWM with the selected harmonic elimination (SHE) for three-level (3L) voltage waveforms. The behavior of up to the 50th non-eliminated harmonics in the NPC converter voltage and current spectra is first shown for a modulation factor changing within 0–1.15 at the pitch of 0.01 for six different SHE PPWM: no. 1–5 and 7; no. 2–5, 7, 11, and 13; no. 3–5, 7, 11, 13, 17, and 19; no. 4–5, 7, 11, 13, 17, 19, 23, and 25; no. 5–5, 7, 11, 13, 17, 19, 23, 25; 29, and 31; no. 6–5, 7, 11, 13, 17, 19, 23, 25, 29, 31, 35, and 37. The concept proposed herein allows measuring the current consumed amplitudes of NPC converter with SHE PPWM at the low average error of about 6%. The adequacy of the approach used herein to determine the current harmonic amplitudes has been experimentally verified with laboratory equipment. The results are consistent with engineering accuracy. The research work is promising for further study and estimation of the impact of the NPC converter SHE PPWM for more complex multi-pulse grid connection circuits and resonance phenomena.
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Luqman, Muhammad, Gang Yao, Lidan Zhou, Di Yang, and Anil Lamichhane. "Study and Implementation of a Cost-Effective 3L-Active Rectifier for DC Collection in WECS." E3S Web of Conferences 118 (2019): 02065. http://dx.doi.org/10.1051/e3sconf/201911802065.

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Power electronic converters are widely used in wind energy conversion system (WECS) applications. Therefore, with the increasing manufacturing capacity of multi-MW wind generators, multi-level converters, or parallel configuration of converters are becoming more attractive solutions towards DC collection from the wind generator. Among the multilevel converters, three-level full-scale neutral point diode clamped (3L-NPC) converter are using extensively for such applications in order to reduce the voltage stress on the semiconductor devices. In this article, a comparative study based on several devices used by NPC, capacitor clamped (CC) as well as Vienna rectifier has been done. Furthermore, their estimated cost comparison and complexity of control switches have been debated. By keeping in view the merits and demerits of these rectifiers, a low cost three-level active rectifier having a smaller number of active switches with a simple control scheme have been implemented. Considering a three-phase electric grid as a generated source, a 2.2KW low-cost three-level Vienna rectifier is simulated using MATLAB/Simulink. DSP (TMS320F28335) based experimental results ratify the simulated circuit with THD<5%.
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Kim, Myoungho, and Hyeok-Jin Yun. "A Basic Design Tool for Grid-Connected AC–DC Converters Using Silcon Carbide MOSFETs." Electronics 12, no. 23 (2023): 4828. http://dx.doi.org/10.3390/electronics12234828.

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The design and optimization of power converters is a key factor in the growth and development of the power electronics field. However, the process of designing a power converter is not straightforward, and engineers often rely on experience and intuition, sometimes requiring time-consuming computer simulations. This paper presents a tool for the basic design of grid-connected AC–DC converters. The design tool takes specifications and operating conditions for two-level and three-level NPC converter topologies and derives a draft design. The tool calculates the input filter’s electrical parameters, the converter’s losses, the temperature rise of the power semiconductor devices, and the ripple current and voltage of the DC-link capacitor. In order to validate the proposed design tool, four AC–DC converters using SiC MOSFETs were designed. Based on the design results, simulation models and prototypes were fabricated to verify the performance and confirm that the proposed design tool can be used in the basic design process of converters.
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Lin, Hao, Jose I. Leon, Wensheng Luo, et al. "Integral Sliding-Mode Control-Based Direct Power Control for Three-Level NPC Converters." Energies 13, no. 1 (2020): 227. http://dx.doi.org/10.3390/en13010227.

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Three-level neutral-point-clamped (NPC) converter is widely used in energy conversion systems due to its good properties for high-power systems presenting output waveforms with reduced harmonic distortion. To obtain better system performance, an integral sliding-mode control (ISMC)-based direct power control (DPC) strategy is proposed for NPC converters. The controller achieves three objectives. First, an extended state observer (ESO)-based ISMC strategy, to enforce the active and reactive power to their reference values, is applied in the power tracking loop. ESO is used to reduce the influence of parameter uncertainties. Next, in the voltage regulation loop, a radial basis function neural network (RBFNN)-based adaptive ISMC strategy is applied to regulate the DC-link voltage. RBFNN is used to estimate the load variation, which is considered as a disturbance, to improve the system disturbance rejection ability. An adaptive law is used in the controller to reduce the chattering of reference active power which can reduce the current harmonic distortion. Finally, a proportional-integral (PI) control strategy is applied in the voltage balancing loop to achieve voltage balance between two DC-link capacitors. Experimental results show the effectiveness and superiority of the proposed control strategy for the NPC power converter compared with PI-based DPC strategy.
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Luqman, Muhammad, Gang Yao, Lidan Zhou, Tao Zhang, and Anil Lamichhane. "A Novel Hybrid Converter Proposed for Multi-MW Wind Generator for Offshore Applications." Energies 12, no. 21 (2019): 4167. http://dx.doi.org/10.3390/en12214167.

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Modern multi-MW wind generators have used multi-level converter structures as well as parallel configuration of a back to back three-level neutral point clamped (3L-NPC) converters to reduce the voltage and current stress on the semiconductor devices. These configurations of converters for offshore wind energy conversion applications results in high cost, low power density, and complex control circuitry. Moreover, a large number of power devices being used by former topologies results in an expensive and inefficient system. In this paper, a novel bi-directional three-phase hybrid converter that is based on a parallel combination of 3L-NPC and ‘n’ number of Vienna rectifiers have been proposed for multi-MW offshore wind generator applications. In this novel configuration, total power equally distributes by sharing of total reference current in each parallel-connected generator side power converter, which ensures the lower current stress on the semiconductor devices. Newly proposed topology has less number of power devices compared to the conventional configuration of parallel 3L-NPC converters, which results in cost-effective, compact in size, simple control circuitry, and good performance of the system. Three-phase electric grid is considered as a generator source for implementation of a proposed converter. The control scheme for a directly connected three-phase source with a novel configuration of a hybrid converter has been applied to ratify the equal power distribution in each parallel-connected module with good power factor and low current distortion. A parallel combination of a 3L-NPC and 3L-Vienna rectifier with a three-phase electric grid source has been simulated while using MATLAB and then implemented it on hardware. The simulation and experimental results ratify the performance and effectiveness of the proposed system.
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A Divya Teja and Dr. N Sambasiva Rao. "Analysis of Three Phase 3-Level NPC Voltage Source Converter for AC-DC Conversion." International Journal for Modern Trends in Science and Technology 06, no. 09 (2020): 144–48. http://dx.doi.org/10.46501/ijmtst060922.

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The use of power electronic converters influences the generation of harmonics and reactive power flow in power system. Therefore, three-phase multilevel improved power quality AC-DC converters are gaining lot of popularity in power conversion applications. This work deals with critical problem of multilevel structure i.e neutral point potential (NPP) variation. In this paper, a simplified current controlled scheme is presented to ensure unity power factor operation. Neutral point potential (NPP) of three-phase, 3-level NPC AC-DC converter is controlled by modifying control signal in the controller using NPP regulator. An auxiliary circuit is being presented in this paper as an alternative option for controlling the neutral point potential of the converter. Comparison has been carried out between these control techniques in terms of power quality. A complete mathematical model is presented for better understanding of both techniques used for NPP control. The presented control techniques has been verified through simulation investigations and validated
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Dissertations / Theses on the topic "NPC three level converters"

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Etxeberria, Aitor. "Microgrid hybrid energy storage and control using a three-level NPC converter." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14695/document.

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L’intégration croissante de la Génération Distribuée basée sur des sources d’énergies renouvelables présente de nouveaux défis pour le réseau électrique centralisé actuel. Le micro-réseau est une des alternatives envisagées afin d’augmenter le taux de pénétration d’énergie renouvelable et d’améliorer la qualité de l’énergie. La stabilité d’un micro-réseau est fortement sensible aux variations de puissance venant des sources d’énergie ou des charges. Dans ce contexte, un système de stockage d’énergie joue un rôle essentiel et doit satisfaire deux conditions : disposer d’une capacité de stockage importante pour adapter la production à la demande et être capable de fournir rapidement une puissance instantanée suffisante pour pallier les problèmes de qualité d’énergie. L’objectif principal de cette thèse est de concevoir et valider expérimentalement un système de conversion de puissance et l’algorithme de contrôle associé pour la gestion du stockage dans un micro-réseau afin de satisfaire les deux conditions. Suite à l’analyse de différentes technologies de stockage, on peut conclure qu’il n’y a pas de système de stockage capable de satisfaire les conditions d’énergie et de puissance en même temps. Par conséquent, l’association d’un supercondensateur et d’une batterie Redox au Vanadium dans un Système de Stockage Hybride est utilisée pour satisfaire les conditions mentionnées. Le travail de recherche est axé sur la gestion du flux d’énergie et de puissance du Système de Stockage Hybride proposé à l’aide d’un système de conversion de puissance innovant et son algorithme de commande. Un convertisseur multi-niveaux 3LNPC a été choisi pour commander en même temps les deux systèmes de stockage, en raison de faibles pertes de puissance et de distorsions harmoniques réduites en comparaison avec d’autres topologies existantes. Un algorithme de commande capable d’exploiter les limites de fonctionnement du convertisseur sur toute sa plage de fonctionnement a été conçu afin de satisfaire de manière optimale les critères spécifiés. Le fonctionnement du système de conversion et la stratégie de commande proposée ont été validés d’abord en simulation et ensuite expérimentalement en utilisant le micro-réseau installé à l’ESTIA<br>The increasing penetration of Distributed Generation systems based on Renewable Energy Sources is introducing new challenges in the current centralised electric grid. The microgrid is one of the alternatives that is being analysed in order to increase the penetration level of renewable energy sources in electrical grids and improve the power quality. The microgrid stability is highly sensitive to power variations coming from the energy sources or loads. In this context, an energy storage system is essential and it must satisfy two criteria: to have a high storage capacity to adapt the generation to the demand and to be able to supply fast power variations to overcome the power quality problems that may arise. The main objective of this thesis has been to design a power conversion system and the associated control algorithm for a storage system management in order to satisfy the defined requirements, as well as to experimentally validate the proposed solution. After an analysis of different storage system technologies, it can be concluded that there is not any storage system capable of offering the energy and power requirements at the same time. Consequently, the association of a SuperCapacitor bank and a Vanadium Redox Battery is used to satisfy the mentioned requirements. This thesis has been focused on the power and energy flow management of the proposed Hybrid Energy Storage System through an innovative power conversion system and its control method. A Three-Level Neutral Point Clamped converter has been used to control at the same time the two storage systems, due to the reduced power losses and harmonic distortion compared to other existing topologies. A control algorithm that uses the operational limits of the converter in its entire operation range has been designed in order to allow selecting the best operation point according to the specified criteria. The operation of the power conversion system and the proposed control method have been first validated in simulations and then experimentally using the microgrid installed in ESTIA
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Kannan, Vijay. "Operation of Parallel Connected Converters as a Multilevel Converter." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-233747.

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The still increasing demand of electrical energy and the rising popularity of renewable energy sources in today's world are two important developments that necessitate the need for innovative solutions in the field of power electronics. Parallel operation of converters is one possible method in trying to bridge an increased current demand. The classical two-level converters, which are the standard in low voltage applications, are rarely adopted in medium and high voltage applications due to the voltage limits on power semiconductor devices. That is one reason for the growing popularity of multilevel converter topologies in medium and high-voltage applications. Although an increase in the number of voltage levels of a multilevel converter has its advantages, there are also challenges posed due to the increased number of switching devices. This has resulted in three-level converters being the most popular compared to converters of higher voltage levels. In this dissertation, the unified operation of parallel connected three-level converter units as a multilevel converter of higher voltage levels is proposed. The mathematical basis for operating parallel connected converter units as a single multilevel converter and the governing equations for such systems are derived. The analysis and the understanding of these equations are important for assessing practicality of the system and devising appropriate control structures. Parallel operation of converter units operating as multilevel converter have their own set of challenges, the two foremost being that of load-sharing and the possibility of circulating and cross currents. Developing solutions to address these challenges require a thorough understanding of how these manifest in the proposed system. Algorithms are then developed for tackling these issues. The control structures are designed and the developed algorithms are implemented. The operation of the system is verified experimentally<br>Die weiterhin steigende Nachfrage nach elektrischer Energie und die zunehmende Verwendung erneuerbarer Energiequellen in der heutigen Welt sind zwei wichtige Entwicklungen, die die Notwendigkeit innovativer Lösungen im Bereich der Leistungselektronik erfordern. Der Parallelbetrieb von Stromrichtern ist eine mögliche Methode, um einen erhöhten Strombedarf zu decken. Der klassische Zweipunkt-Spanungszwischenkreisstromrichter, der bei Niederspannungsanwendungen weit verbreitet ist, wird aufgrund der Spannungsgrenzen für Leistungshalbleiterbauelemente zunehmend weniger in Mittel- und Hochspannungsanwendungen eingesetzt. Die begrenzte Spannungsbelastbarkeit der Leistungshalbleiterbauelemente ist ein Grund für die wachsende Beliebtheit von Mehrpunkt-Stromrichtertopologien in Mittelund Hochspannungsanwendungen. Obwohl eine Erhöhung der Anzahl der Spannungsstufen eines Mehrpunkt-Stromrichters Vorteile hat, gibt es auch Herausforderungen und Nachteile aufgrund der erhöhten Anzahl von Leistungshalbleitern. Dies hat dazu geführt, dass der Dreipunkt-Stromrichter die verbreiteste Topologie im Vergleich zu anderen Stromrichtern mit einer höheren Anzahl von Spannungsstufen ist. In dieser Dissertation wird der Betrieb von parallel geschalteten Dreipunkt-Stromrichtereinheiten als ein Mehrpunkt-Stromrichter mit erhöhter Anzahl an Spannungsstufen vorgeschlagen. Die mathematische Basis für den Betrieb von parallel geschalteten Stromrichtereinheiten als ein Mehrpunkt-Stromrichter und die beschreibenden Gleichungen eines solchen Systems werden abgeleitet. Die Analyse und das Verständnis dieser Gleichungen sind wichtig für die Beurteilung der Praktikabilität des Systems und die Erarbeitung geeigneter Regelstrukturen. Der parallele Betrieb von Stromrichtereinheiten hat seine eigenen Herausforderungen, wobei die beiden wichtigsten die Lastverteilung und die Möglichkeit von Kreis- und Querströmen sind. Die Entwicklung von Lösungen zur Bewältigung dieser Herausforderungen erfordert ein gründliches Verständnis dafür, wie sich diese Phänomene in dem vorgeschlagenen System manifestieren. Algorithmen zur Lösung dieser Probleme werden anschlieend entwickelt. Die Regelstrukturen werden entworfen und die entworfenen Algorithmen implementiert. Die Funktionsweise des Systems wird experimentell überprüft
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Rojas, Lobos Felix Eduardo [Verfasser], Ralph [Akademischer Betreuer] [Gutachter] Kennel, and Jon [Gutachter] Clare. "A High Performance Power Supply based on a Four-Leg Three-Level NPC Converter for Non-linear and Unbalanced Systems / Felix Eduardo Rojas Lobos. Betreuer: Ralph Kennel. Gutachter: Ralph Kennel ; Jon Clare." München : Universitätsbibliothek der TU München, 2016. http://d-nb.info/1111038929/34.

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Hawley, Joshua Christiaan. "Modeling and Simulation of a Cascaded Three-Level Converter-Based SSSC." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/10109.

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This thesis is dedicated to a comprehensive study of static series synchronous compensator (SSSC) systems utilizing cascaded-multilevel converters (CMCs). Among flexible AC transmission system (FACTS) controllers, the SSSC has shown feasibility in terms of cost-effectiveness in a wide range of problem-solving abilities from transmission to distribution levels. Referring to the literature reviews, the CMC with separated DC capacitors is clearly the most feasible topology for use as a power converter in the SSSC applications. The control for the CMC-Based SSSC is complicated. The design of the complicated control strategy was begun with well-defined system transfer functions. The stability of the system was achieved by trial and error processes, which were time-consuming and ineffective. The goal of this thesis is to achieve a reliable controller design for the CMC-based SSSC. Major contributions are addressed as follows: 1) accurate models of the CMC for reactive power compensations in both ABC and DQ0 coordinates, and 2) an effective decoupling power control technique. To simplify the control system design, well-defined models of the CMC-Based SSSC in both ABC and DQ0 coordinates are proposed. The proposed models are for the CMC-Based SSSC focus on only three voltage levels but can be expanded for any number of voltage levels. The key system transfer functions are derived and used in the controller design process. To achieve independent power control capability, the control technique, called the decoupling power control used in the design for the CMC-Based STATCOM is applied. This control technique allows both the real and reactive power components to be independently controlled. With the combination of the decoupling power control and the cascaded PWM, a CMC with any number of voltage levels can be simply modeled as a three-level cascaded converter, which is the simplest topology to deal with. This thesis focuses on the detailed design process needed for a CMC-Based SSSC.<br>Master of Science
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Krishna, Remya. "Grid Connected Three-Level Converters : Studies for Wave Energy Conversion." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-218219.

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This thesis presents an electrical system analysis of a wave energy converter (WEC) for the objective of grid connection. To transfer the enormous amount of power from waves to the load centers, efficient power electronic systems are essential. This thesis includes the modeling of a buoy–translator dynamics and the modeling of a linear permanent magnet generator along with simulation and experimental validation. Diode bridge rectifiers are considered for rectification to avoid the complex linear generator control at the input side. To reduce the size and the cost of energy storage elements, DC voltage regulation is done using a DC/DC converter. To achieve smooth and high power, many WECs need to be connected to a common DC link. A neutral point clamped inverter is considered for the DC/AC conversion due to its advantages over conventional topologies. Various pulse width modulation schemes are tested for the inverter to choose the optimum PWM method. The harmonics in the inverter output voltage is derived numerically and compared with simulation and experiment to understand the effect of dead-time in the inverter operation. Depending on the load current drawn from the inverter, the voltages in the two input capacitors of a three-level neutral point clamped inverter deviates from equilibrium unless the neutral point is grounded. To avoid this voltage imbalance as well as to regulate the DC link voltage a dual output boost converter with pulse delay control is proposed. The modeling, simulation and experiments show an improvement in the compensation voltage using pulse delay control compared to the previously proposed methods in the literature. The synchronous current control and the grid connection of the three-level converter have been accomplished in the laboratory.  Finally, the three-level power converter system has been tested with a linear permanent magnet generator at Lysekil to analyze the controller requirements.
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Tolunay, Bengi. "Space Vector Pulse Width Modulationfor Three-Level Converters : a LabVIEW Implementation." Thesis, Uppsala universitet, Elektricitetslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-169019.

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This thesis explains the theory and implementation of the Space Vector Pulse WidthModulation (SVPWM) using the graphical programming environment LabVIEW as itsbasis. All renewable energy sources are in need of multilevel power electronics inform of multilevel inverters. The mind behind the pulses created by the inverters isthe SVPWM. This modulation type uses a space vector, referred to as the referencevector, to locate and create the desired sinusoidal-shaped waveform. Using LabVIEWas the software makes it easy to read real-time output from the integrated circuit ofthe hardware (FPGA). The SVPWM shows good utilization of the DC-link voltage,low current ripple and is relatively easy to implement in the hardware, making itsuitable for any high-voltage, high-power application.
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Zhang, Xuning. "Passive Component Weight Reduction for Three Phase Power Converters." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/47788.

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Over the past ten years, there has been increased use of electronic power processing in alternative, sustainable, and distributed energy sources, as well as energy storage systems, transportation systems, and the power grid. 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, such as high efficiency and fast response. For transportation applications, high power density is the key design target, since increasing power density can reduce fuel consumption and increase the total system efficiency. While power electronics devices have greatly improved the efficiency, overall performance and power density of power converters, using power electronic devices also introduces EMI issues to the system, which means filters are inevitable in those systems, and they make up a significant portion of the total system size and cost. Thus, designing for high power density for both power converters and passive components, especially filters, becomes the key issue for three-phase converters. This dissertation explores two different approaches to reducing the EMI filter size. One approach focuses on the EMI filters itself, including using advanced EMI filter structures to improve filter performance and modifying the EMI filter design method to avoid overdesign. The second approach focuses on reducing the EMI noise generated from the converter using a three-level and/or interleaving topology and changing the modulation and control methods to reduce the noise source and reduce the weight and size of the filters. This dissertation is divided into five chapters. Chapter 1 describes the motivations and objectives of this research. After an examination of the surveyed results from the literature, the challenges in this research area are addressed. Chapter 2 studies system-level EMI modeling and EMI filter design methods for voltage source converters. Filter-design-oriented EMI modeling methods are proposed to predict the EMI noise analytically. Based on these models, filter design procedures are improved to avoid overdesign using in-circuit attenuation (ICA) of the filters. The noise propagation path impedance is taken into consideration as part of a detailed discussion of the interaction between EMI filters, and the key design constraints of inductor implementation are presented. Based on the modeling, design and implementation methods, the impact of the switching frequency on EMI filter weight design is also examined. A two-level dc-fed motor drive system is used as an example, but the modeling and design methods can also be applied to other power converter systems. Chapter 3 presents the impact of the interleaving technique on reducing the system passive weight. Taking into consideration the system propagation path impedance, small-angle interleaving is studied, and an analytical calculation method is proposed to minimize the inductor value for interleaved systems. The design and integration of interphase inductors are also analyzed, and the analysis and design methods are verified on a 2 kW interleaved two-level (2L) motor drive system. Chapter 4 studies noise reduction techniques in multi-level converters. Nearest three space vector (NTSV) modulation, common-mode reduction (CMR) modulation, and common-mode elimination (CME) modulation are studied and compared in terms of EMI performance, neutral point voltage balancing, and semiconductor losses. In order to reduce the impact of dead time on CME modulation, the two solutions of improving CME modulation and compensating dead time are proposed. To verify the validity of the proposed methods for high-power applications, a 100 kW dc-fed motor drive system with EMI filters for both the AC and DC sides is designed, implemented and tested. This topology gains benefits from both interleaving and multilevel topologies, which can reduce the noise and filter size significantly. The trade-offs of system passive component design are discussed, and a detailed implementation method and real system full-power test results are presented to verify the validity of this study in higher-power converter systems. Finally, Chapter 5 summarizes the contributions of this dissertation and discusses some potential improvements for future work.<br>Ph. D.
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Jamil, Mohsin. "Repetitive current control of two-level and interleaved three-phase PWM utility connected converters." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/301402/.

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This thesis is mainly concerned with investigations into digital repetitive current control of two-level and interleaved utility connected PWM converters. The research is motivated by the relatively poor performance of classical (PI) controllers when the utility voltage harmonic distortion is high. This is due to the low gain, and poor disturbance rejection of the PI controller at the utility harmonic frequencies. Repetitive feedback controllers have the ability to track or reject periodic disturbances, such as utility harmonics, as they naturally have high gains at the utility voltage harmonic frequencies, assuming that these frequencies do not change. Repetitive controllers (RC) are known for being sensitive to variations in system parameters and disturbance frequency, which in practice renders them either ineffective or unstable. Another challenge arises from the memory requirements of RC in case of the absence of even harmonics, which can make its practical implementation difficult and expensive. In addition, another problem that has not been investigated extensively in the literature is that the effectiveness of RC is severely limited by the limited bandwidth of the plant (the utility connected converter and its filter). Theoretical analysis and simulation results presented in this thesis show that RC could not effectively reject disturbances at frequencies above the closed loop system bandwidth. The design of the converter's output filter bandwidth and the values of its components need to be selected carefully, to enable RC to be used effectively. The research in this thesis focuses on investigating the practical implementation and performance limits of two types of repetitive controllers (conventional and oddharmonics), used for current control of two-level utility connected converter with LCL output filter. The odd-harmonic repetitive controller halves the memory requirement and offers higher gains only at odd harmonic frequencies of interest. The overall control scheme consists of the traditional classical tracking controller with a dual loop feedback system and RC. The results indicate that the repetitive controller improves the steady state error and the total harmonic distortion of the output current, provided that the plant's bandwidth is sufficiently large. Finally, a repetitive controller for an interleaved utility connected converter has been designed and investigated in this study. The interleaved converter system has higher bandwidth than the two-level converter, which improves the effectiveness of RC. It provides good disturbance rejection compared to classical controllers which results in low output current THD. The RC was demonstrated to be robust despite uncertainty in utility impedance, while achieving a fast almost zero error convergence. The proposed RC has been experimentally implemented using a DSP and the results indicate that the quality of output current complies with international standards on harmonic limits and matches simulation results obtained from the Matlab/Simulink model of the system.
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Orfanoudakis, G. I. "Analysis and reduction of dc-link capacitor voltage/current stress in three-level PWM converters." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/352195/.

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Power electronic converters are in the heart of modern renewable energy and motor drive systems. This Thesis focuses on the converter dc-link capacitor (bank), which is a costly component and a common source of failures. The Thesis is divided into two parts. The first part examines the voltage and current stress induced on dc-link capacitors by the three most common converter topologies: The conventional two-level converter, the Neutral-Point-Clamped (NPC) three-level converter, and the Cascaded H-Bridge (CHB) three-level converter. The expressions derived for the rms capacitor current and its harmonics can be used as a tool for capacitor sizing. The harmonic analysis is then extended to systems that incorporate multiple converters connected to a common dc-link capacitor. The effect of introducing a phase shift to the converter carrier waveforms is examined, showing that reductions in the order of 30 to 50% in the common capacitor rms current can be achieved using appropriate phase shifts. The second part tackles the dc-link capacitor balancing problem, also known as Neutral Point (NP) balancing problem of the three-level NPC converter. Initially, a circuit that halves the voltage stress caused by the NP voltage oscillations (ripple) on the switching devices the NPC converter is proposed. The circuit consists of low voltage rated components which offer the advantages of lower losses, volume and cost, as compared to other balancing circuits. Subsequently, the study focuses on modulation strategies for the NPC converter. Starting with Nearest-Vector (NV) strategies, it proves that the criterion of the direction of dc-link capacitor imbalance, which is commonly adopted by NV strategies for performing the task of capacitor balancing, poses a barrier in achieving minimum NP voltage ripple. A new criterion is proposed instead, together with an algorithm that incorporates it into existing NV strategies. For the interesting case of NPC converters operating as motor drives, the resulting reduction in the amplitude of NP voltage ripple ranges from 30 to 50%. The study finishes with an extension of the previous concept to create hybrid (combinations of NV and non NV) strategies for the NPC converter. Hybrid strategies are proposed that can eliminate NP voltage ripple, introducing lower switching losses and output voltage distortion as compared to other methods used for the same purpose. The proposed strategies perform equally well when the converter operates with non linear or imbalanced loads. All results are verified by extensive simulations using MATLAB-Simulink.
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Pou, Félix Josep. "Modulation and control of three-phase PWM multilevel converters." Doctoral thesis, Universitat Politècnica de Catalunya, 2002. http://hdl.handle.net/10803/6327.

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La present tesi doctoral estudia els inversors trifàsics multinivell del tipus denominat de díodes de fixació (diode-clamped converters). Aquests convertidors poden generar tres o més nivells de tensió a cada fase de sortida, i normalment s'apliquen a sistemes de gran potència ja que poden treballar amb tensions majors que els inversors clàssics. L'anàlisi es centra fonamentalment en la topologia de tres nivells, tot i que també es realitzen contribucions per a convertidors de més nivells. Els principals objectius són la proposta de nous algorismes de modulació vectorial PWM de processat ràpid, l'estudi i la compensació dels efectes dels desequilibris de les tensions dels condensadors del bus de continua, i l'anàlisi de llaços de control avançat.<br/>S'han desenvolupat diversos models que han permès obtenir resultats de simulació de les tècniques de modulació i control proposades. A més, gràcies a l'estada d'un any de l'autor al Center for Power Electronics Systems (CPES) a Virginia Tech, USA, la tesi també inclou resultats experimentals que consoliden les conclusions i metodologies presentades. Les principals contribucions es resumeixen a continuació. <br/>Es presenta un nou algorisme de modulació vectorial PWM que aprofita simetries del diagrama vectorial per a reduir el temps de processat. S'analitzen i es quantifiquen les oscil·lacions de tensió de baixa freqüència que apareixen en el punt central dels condensadors del convertidor de tres nivells. Aquesta informació permet dimensionar els condensadors donades les especificacions d'una determinada aplicació.<br/>L'algorisme de modulació també s'aplica a convertidors de més nivells. Pel cas concret del convertidor de quatre nivells, es comprova l'existència de corrents continus en els punts mitjos dels condensadors que fan que els sistema sigui inestable. Es determinen gràficament les zones d'inestabilitat. <br/>Es presenta un nou i eficient algorisme de modulació vectorial feedforward en el convertidor de tres nivells que és capaç de generar tensions trifàsiques de sortida equilibrades, malgrat l'existència de desequilibris en les tensions dels condensadors.<br/>S'estudien els efectes negatius de càrregues lineals desequilibrades i càrregues no lineals en el control de les tensions dels condensadors. Es justifica que l'existència d'un quart harmònic en els corrents de càrrega pot inestabilitzar el sistema. És determina la màxima amplitud tolerable d'aquest harmònic.<br/>S'estudia la millora en l'equilibrat de les tensions d'una connexió de dos convertidors de tres nivells al mateix bus de continua (back-to-back connection). Un exemple d'aplicació pràctica és la conversió AC/DC/AC per a l'accionament de motors d'alterna treballant amb factor de potència unitari.<br/>Finalment s'aplica un controlador òptim al convertidor de tres nivells treballant com a rectificador elevador (boost). El llaç de control LQR (Linear Quadratic Regulator) es simplifica donat que la tasca d'equilibrat de les tensions dels condensadors es dur a terme en el mateix modulador.
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Books on the topic "NPC three level converters"

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Yazdani, Amirnaser. Modelling and control of the three-level neutral point diode clamped (NPC) converter for high-power applications. 2005.

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Book chapters on the topic "NPC three level converters"

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Yin, Yunfei, Lei Liu, Zhijian Hu, Hao Lin, and Ligang Wu. "Direct Power Control for Three-Level NPC Converters." In Robust Control Strategies for Power Electronics in Smart Grid Applications. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-53188-0_4.

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Yin, Yunfei, Lei Liu, Zhijian Hu, Hao Lin, and Ligang Wu. "Fuzzy Sliding Mode Control for Three-Level NPC Converters." In Robust Control Strategies for Power Electronics in Smart Grid Applications. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-53188-0_5.

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Yin, Yunfei, Lei Liu, Zhijian Hu, Hao Lin, and Ligang Wu. "Robust High-Quality Current Control for Three-Level NPC Converters." In Robust Control Strategies for Power Electronics in Smart Grid Applications. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-53188-0_3.

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Jing, Wei, Guojun Tan, and Zongbin Ye. "Loss Calculation of NPC Three-Level Converter in Permanent Magnet Direct-Drive Wind Power Generation System." In Lecture Notes in Electrical Engineering. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-4981-2_63.

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Nam, Vo Xuan, Le Van Manh Giau, Nguyen Van Nho, and Tran Thanh Trang. "Neutral Point Voltage Balancing Method and the Influence of Some Parameters on Capacitor Voltage in Three-Level NPC Converter." In AETA 2013: Recent Advances in Electrical Engineering and Related Sciences. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41968-3_17.

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Ganesan, Swaminathan, V. Ramesh, S. Umashankar, and P. Sanjeevikumar. "Fuzzy-Based Microgrid Energy Management System Using Interleaved Boost Converter and Three-Level NPC Inverter with Improved Grid Voltage Quality." In Lecture Notes in Electrical Engineering. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4286-7_32.

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Zhang, Yun, and Shenghan Gao. "Three-Level DC–DC Converters." In CPSS Power Electronics Series. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-0648-8_3.

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Dennai, Mohammed Yassine, Hamza Tedjini, and Abdelfettah Nasri. "Transformerless PV Three Level NPC Central Inverter." In Lecture Notes in Networks and Systems. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-37207-1_72.

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Ooi, Gabriel H. P. "Mathematical Modeling of Classical Three-Level Converters." In Advanced Multilevel Converters and Applications in Grid Integration. John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119476030.ch3.

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Li, Xiaowei, and Dong Lin. "Three-Vector Model Predictive Control Strategy for NPC Three-Level Inverter." In Lecture Notes in Electrical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-96-1868-2_20.

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Conference papers on the topic "NPC three level converters"

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Jiang, Wei, Yonglei Zhang, Xibo Yuan, Xiang Guo, Ruijie Zhu, and Yi Li. "Extended Control Set Model Predictive Control for Three-Phase Three-Level NPC Converters." In 2024 IEEE 9th Southern Power Electronics Conference (SPEC). IEEE, 2024. https://doi.org/10.1109/spec62217.2024.10893251.

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Liu, Guangxin, Xiaoning Shen, Jianhua Zhang, Yabin Gao, and Jianxing Liu. "Disturbances Observer-Based Fixed-Time Sliding Mode Control for Three-Level NPC Converters in Microgrid." In 2024 IEEE 22nd International Conference on Industrial Informatics (INDIN). IEEE, 2024. https://doi.org/10.1109/indin58382.2024.10774239.

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Dou, Zechun, Prashant Jain, Yu Qi, et al. "150 kVA Compact Modular Three-Level NPC Auxiliary Converter for the Railways Application." In 2024 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC). IEEE, 2024. https://doi.org/10.1109/esars-itec60450.2024.10819889.

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Yan, Zheng, Tarek Ould-Bachir, Karim Meddah, Téo Robert, Romain Monthéard, and Emmanuel Rutovic. "DMM-ESH Technique for Real-time Simulation of Three-level NPC Dual Active Bridge Converter." In IECON 2024 - 50th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2024. https://doi.org/10.1109/iecon55916.2024.10905616.

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Cai, Xinbo, Zhenkun Zhang, Jin Zhang, Zhen Li, Ralph Kennel, and Zhenbin Zhang. "Improved Predictive Control of Three-Level-NPC Power Converters." In 2021 IEEE International Conference on Predictive Control of Electrical Drives and Power Electronics (PRECEDE). IEEE, 2021. http://dx.doi.org/10.1109/precede51386.2021.9680960.

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Attaianese, C., M. Di Monaco, and G. Tomasso. "Three-Phase Three-Level active NPC converters for high power systems." In 2010 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM 2010). IEEE, 2010. http://dx.doi.org/10.1109/speedam.2010.5542195.

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Li, Ning, Yue Wang, Su Li, Yufei Li, and Zhao'an Wang. "Direct power control strategy used in three-level NPC converters." In 2012 7th International Power Electronics and Motion Control Conference (IPEMC 2012). IEEE, 2012. http://dx.doi.org/10.1109/ipemc.2012.6259087.

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Chenchen, Wang, Zhang Can, and You Xiaojie. "An improved voltage balancing compensator for three-level NPC converters." In 2011 International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2011. http://dx.doi.org/10.1109/icems.2011.6073864.

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Grimm, Ferdinand, Yu Li, Heping Li, and Zhenbin Zhang. "Compressive Sensing Based Predictive Control of Three-Level NPC Converters." In 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe). IEEE, 2019. http://dx.doi.org/10.23919/epe.2019.8915092.

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Floricau, Dan, Claudia-Laurenta Popescu, Mihai-Octavian Popescu, Elena Floricau, and Lucian Spataru. "A comparison of efficiency for three-level NPC and Active NPC voltage source converters." In 2009 Compatability and Power Electronics (CPE). IEEE, 2009. http://dx.doi.org/10.1109/cpe.2009.5156055.

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Reports on the topic "NPC three level converters"

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Cleary, Summers, Michelle Kinseth, and Michelle Uchitel. Land Cover Summary Statistics for Antietam National Battlefield. National Park Service, 2023. http://dx.doi.org/10.36967/2301818.

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This technical report documents the acquisition of source data, and calculation of land cover summary statistics datasets for Antietam National Battlefield. The source data and land cover calculations are available for use within the National Park Service (NPS) Inventory &amp; Monitoring (I&amp;M) Program. Land cover summary statistics datasets can be calculated for all geographic regions within the extent of the NPS; this report includes statistics calculated for the conterminous United States. The land cover summary statistics datasets are calculated from multiple sources, including Multi-Resolution Land Characteristics Consortium products in the National Land Cover Database (NLCD) and United States Geological Survey?s (USGS) Earth Resources Observation and Science (EROS) Center products in the Land Change Monitoring, Assessment, and Projection (LCMAP) raster dataset. These summary statistics calculate land cover at up to three classification scales: Level 1, modified Anderson Level 2, and Natural versus Converted land cover. The output land cover summary statistics datasets produced here for Antietam National Battlefield utilize the most recent versions of the source datasets (NLCD and LCMAP). These land cover summary statistics datasets are used in the NPS I&amp;M Program, including the NPS Environmental Settings Monitoring Protocol and may be used by networks and parks for additional efforts.
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Cleary, Summers, Michelle Kinseth, and Michelle Uchitel. Land Cover Summary Statistics for Antietam National Battlefield. National Park Service, 2022. http://dx.doi.org/10.36967/2300391.

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This technical report documents the acquisition of source data, and calculation of land cover summary statistics datasets for Antietam National Battlefield. The source data and land cover calculations are available for use within the National Park Service (NPS) Inventory &amp; Monitoring (I&amp;M) Program. Land cover summary statistics datasets can be calculated for all geographic regions within the extent of the NPS; this report includes statistics calculated for the conterminous United States. The land cover summary statistics datasets are calculated from multiple sources, including Multi-Resolution Land Characteristics Consortium products in the National Land Cover Database (NLCD) and United States Geological Survey?s (USGS) Earth Resources Observation and Science (EROS) Center products in the Land Change Monitoring, Assessment, and Projection (LCMAP) raster dataset. These summary statistics calculate land cover at up to three classification scales: Level 1, modified Anderson Level 2, and Natural versus Converted land cover. The output land cover summary statistics datasets produced here for Antietam National Battlefield utilize the most recent versions of the source datasets (NLCD and LCMAP). These land cover summary statistics datasets are used in the NPS I&amp;M Program, including the NPS Environmental Settings Monitoring Protocol and may be used by networks and parks for additional efforts.
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Cleary, Summers. Land Cover Summary Statistics for National Capital Region Park Units. National Park Service, 2024. http://dx.doi.org/10.36967/2301309.

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This report documents the acquisition of source data, and calculation of land cover summary statistics datasets for ten National Park Service National Capital Region park units and three custom areas of analysis: Catoctin Mountain Park, Chesapeake &amp; Ohio Canal National Historical Park, George Washington Memorial Parkway, Harpers Ferry National Historical Park, Manassas National Battlefield Park, Monocacy National Battlefield, National Capital Parks - East, Prince William Forest Park, Rock Creek Park, Wolf Trap National Park for the Performing Arts, and the three custom areas of analysis - National Capital Parks - East: Oxon Cove Park, Oxon Hill Farm, Piscataway Park, National Capital Parks - East: Greenbelt Park and Baltimore-Washington Parkway, and National Capital Parks - East: DC and Suitland Parkway. The source data and land cover calculations are available for use within the National Park Service (NPS) Inventory and Monitoring Program. Land cover summary statistics datasets can be calculated for all geographic regions within the extent of the NPS; this report includes statistics calculated for the conterminous United States. The land cover summary statistics datasets are calculated from multiple sources, including Multi-Resolution Land Characteristics Consortium products in the National Land Cover Database (NLCD) and United States Geological Survey?s (USGS) Earth Resources Observation and Science (EROS) Center products in the Land Change Monitoring, Assessment, and Projection (LCMAP) raster dataset. These summary statistics calculate land cover at up to three classification scales: Level 1, modified Anderson Level 2, and Natural versus Converted land cover. The output land cover summary statistics datasets produced here for the ten National Capital Region park units and three custom areas of analysis utilize the most recent versions of the source datasets (NLCD and LCMAP). These land cover summary statistics datasets are used in the NPS Inventory and Monitoring Program, including the NPS Environmental Settings Monitoring Protocol and may be used by networks and parks for additional efforts.
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Cleary, Summers, and Summers Cleary. Land Cover Summary Statistics for Greater Yellowstone Network Park Units. National Park Service, 2024. http://dx.doi.org/10.36967/2302418.

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This report documents the acquisition of source data, and calculation of land cover summary statistics datasets for four National Park Service Greater Yellowstone Network park units and six custom areas of analysis: Bighorn Canyon National Recreation Area, Grand Teton National Park, John D. Rockefeller Jr.?Memorial Parkway, Yellowstone National Park, and the six custom areas of analysis. The source data and land cover calculations are available for use within the National Park Service (NPS) Inventory and Monitoring Program. Land cover summary statistics datasets can be calculated for all geographic regions within the extent of the NPS; this report includes statistics calculated for the conterminous United States. The land cover summary statistics datasets are calculated from multiple sources, including Multi-Resolution Land Characteristics Consortium products in the National Land Cover Database (NLCD) and the United States Geological Survey?s (USGS) Earth Resources Observation and Science (EROS) Center products in the Land Change Monitoring, Assessment, and Projection (LCMAP) raster dataset. These summary statistics calculate land cover at up to three classification scales: Level 1, modified Anderson Level 2, and Natural versus Converted land cover. The output land cover summary statistics datasets produced here for the four Greater Yellowstone Network park units and six custom areas of analysis utilize the most recent versions of the source datasets (NLCD and LCMAP). These land cover summary statistics datasets are used in the NPS Inventory and Monitoring Program, including the NPS Environmental Settings Monitoring Protocol and may be used by networks and parks for additional efforts.
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Cleary, Summers, and Summers Cleary. Land Cover Summary Statistics for Klamath Network Park Units. National Park Service, 2024. http://dx.doi.org/10.36967/2303211.

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This report documents the acquisition of source data, and calculation of land cover summary statistics datasets for six National Park Service Klamath Network park units and seven custom areas of analysis: Crater Lake National Park, Lassen Volcanic National Park, Lava Beds National Monument, Oregon Caves National Monument and Preserve, Redwood National and State Parks, Whiskeytown National Recreation Area, and the seven custom areas of analysis. The source data and land cover calculations are available for use within the National Park Service (NPS) Inventory and Monitoring Program. Land cover summary statistics datasets can be calculated for all geographic regions within the extent of the NPS; this report includes statistics calculated for the conterminous United States. The land cover summary statistics datasets are calculated from multiple sources, including Multi-Resolution Land Characteristics Consortium products in the National Land Cover Database (NLCD) and the United States Geological Survey?s (USGS) Earth Resources Observation and Science (EROS) Center products in the Land Change Monitoring, Assessment, and Projection (LCMAP) raster dataset. These summary statistics calculate land cover at up to three classification scales: Level 1, modified Anderson Level 2, and Natural versus Converted land cover. The output land cover summary statistics datasets produced here for the six Klamath Network park units and seven custom areas of analysis utilize the most recent versions of the source datasets (NLCD and LCMAP). These land cover summary statistics datasets are used in the NPS Inventory and Monitoring Program, including the NPS Environmental Settings Monitoring Protocol and may be used by networks and parks for additional efforts.
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