Relevant bibliographies by topics / Converter systems

Academic literature on the topic 'Converter systems'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Converter systems"

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Sundar, T., and S. Sankar. "Modeling and Simulation of Closed Loop Controlled Parallel Cascaded Buck Boost Converter Inverter Based Solar System." International Journal of Power Electronics and Drive Systems (IJPEDS) 6, no. 3 (September 1, 2015): 648. http://dx.doi.org/10.11591/ijpeds.v6.i3.pp648-656.

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<p>This Work deals with design, modeling and simulation of parallel cascaded buck boost converter inverter based closed loop controlled solar system. Two buck boost converters are cascaded in parallel to reduce the ripple in DC output. The DC from the solar cell is stepped up using boost converter. The output of the boost converter is converted to 50Hz AC using single phase full bridge inverter. The simulation results of open loop and closed loop systems are compared. This paper has presented a simulink model for closed loop controlled solar system. Parallel cascaded buck boost converter is proposed for solar system.</p>
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Gouveia, José, Carlos L. Moreira, and João A. Peças Lopes. "Influence of Load Dynamics on Converter-Dominated Isolated Power Systems." Applied Sciences 11, no. 5 (March 6, 2021): 2341. http://dx.doi.org/10.3390/app11052341.

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The operation of isolated power systems with 100% converter-based generation requires the integration of battery energy storage systems (BESS) using grid-forming-type power converters. Under these operating conditions, load dynamics influences the network frequency and voltage following large voltage disturbances. In this sense, the inclusion of induction motor (IM) load models is required to be properly considered in BESS power converter sizing. Thus, this paper presents an extensive sensitivity analysis, demonstrating how load modeling affects the BESS power converter capacity when adopting conventional control strategies while aiming to assure the successful recovery of all IM loads following a network fault. Furthermore, this work highlights that generators with converter interfaces can actively contribute to mitigate the negative impacts resulting from IM loads following a network fault. Thereby, two distinct control strategies are proposed to be integrated in the power electronic interfaces of the available converter-based generators: one to be adopted in grid-following converters and another one suitable for grid-forming converters. The proposed control strategies provide an important contribution to consolidating insular grid codes, aiming to achieve operational scenarios accommodating 100% penetration of converter-based generation with a significative percentage of the IM load composition without resorting to a significative increase in BESS power converter sizing.
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Jalbrzykowski, S., and T. Citko. "A bidirectional DC-DC converter for renewable energy systems." Bulletin of the Polish Academy of Sciences: Technical Sciences 57, no. 4 (December 1, 2009): 363–68. http://dx.doi.org/10.2478/v10175-010-0139-7.

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A bidirectional DC-DC converter for renewable energy systemsTo improve the energy quality, most of the renewable energy systems include an energy storage element charged by the bidirectional DC-DC converter. This paper proposes the bidirectional DC-DC converter which employs the two bridge configuration resonant class-E converters on the both sides of the isolating transformer. The low side converter is controlled as step up and the high side converter is controlled as step down. The proposed system is characterized by good dynamic properties and high efficiency because the converter transistors are switched in ZVS conditions. A theoretical analysis to provide relations for system design, and the laboratory model investigations to validate the system characteristic are given in the paper.
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Palanisamy, R., K. Vijayakumar, V. Venkatachalam, R. Mano Narayanan, D. Saravanakumar, and K. Saravanan. "Simulation of various DC-DC converters for photovoltaic system." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 2 (April 1, 2019): 917. http://dx.doi.org/10.11591/ijece.v9i2.pp917-925.

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This work explains the comparison of various dc-dc converters for photovoltaic systems. In recent day insufficient energy and continues increasing in fuel cost, exploration on renewable energy system becomes more essential. For high and medium power applications, high input source from renewable systems like photovoltaic and wind energy system turn into difficult one, which leads to increase of cost for installation process. So the generated voltage from PV system is boosted with help various boost converter depends on the applications. Here the various converters are like boost converter, buck converter, buck-boost converter, cuk converter, sepic converter and zeta converter are analysed for photovoltaic system, which are verified using matlab / simulink.
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Gao, Xian, Dao Zhou, Amjad Anvari-Moghaddam, and Frede Blaabjerg. "A Comparative Study of Grid-Following and Grid-Forming Control Schemes in Power Electronic-Based Power Systems." Power Electronics and Drives 8, no. 1 (January 1, 2023): 1–20. http://dx.doi.org/10.2478/pead-2023-0001.

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Abstract Along with de-carbonisation, the penetration of power electronic converters has increased, and the power system has become a power electronic-based power system. In such a situation, the stability of the power system faces great challenges. In the event of a large disturbance, the power grid will lack the ability to maintain a stable voltage and frequency. In order to improve the stability of the power grid, the traditional grid-following (GFL) control is needed to be converted to the grid-forming (GFM) control. This paper analyses the control schemes of the GFL and GFM converters by investigating their state-space models, and the eigenvalue trajectories of both control schemes are shown to analyse the stability of the systems. Moreover, a case study is exemplified to compare the performance of the two control strategies while responding to frequency disturbances. Finally, a time-domain simulation model of a 15 kW grid-connected converter is built in Matlab/Simulink to benchmark the performance of the GFL and GFM converters under different working conditions. The result reveals that the GFL converter may encounter some instabilities when applied in power electronic-based systems, while the GFM converter is more suitable for the weak power grid.
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Balan, Horia, Maria Buzdugan, I. Vadan, E. Simion, and P. Karaissas. "Hybrid Commutation Converter in HVDC Systems." Materials Science Forum 670 (December 2010): 415–24. http://dx.doi.org/10.4028/www.scientific.net/msf.670.415.

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This paper deals with DC – AC static converter systems, of very high voltages and currents, used for electricity power transmission. It has been analyzed three types of converters: with forced commutation, with commutation from load and the solution proposed by the authors. There are shown the advantages in hybrid switching converters, which in essence connect, constructive and as principle of operation, the advantages of the two known conversion systems. The analysis of the benefits of the proposed solution is done by comparing the circulating power of assets and also by analyzing the power factor. Not in the last, must be mentioned the paper contribution to the development of the theoretical base design for switching converters with hybrid commutation.
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Herbst, Gernot. "A Building-Block Approach to State-Space Modeling of DC-DC Converter Systems." J 2, no. 3 (July 8, 2019): 247–67. http://dx.doi.org/10.3390/j2030018.

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Small-signal models of DC-DC converters are often based on a state-space averaging approach, from which both control-oriented and other frequency-domain characteristics, such as input or output impedance, can be derived. Updating these models when extending the converter by filters or non-trivial loads, or adding control loops, can become a tedious task, however. To simplify this potentially error-prone process, a modular modeling approach is being proposed in this article. It consists of small state-space models for certain building blocks of a converter system on the one hand, and standardized operations for connecting these subsystem models to an overall converter system model on the other hand. The resulting state-space system model builds upon a two-port converter description and allows the extraction of control-oriented and impedance characteristics at any modeling stage, be it open loop or closed loop, single converter or series connections of converters. The ease of creating more complex models enabled by the proposed approach is also demonstrated with examples comprising multiple control loops or cascaded converters.
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Dybko, Maxim, Sergey Brovanov, and Hong Hee Lee. "Multilevel NPC Converters in Parallel Connection for Power Conditioning Systems." Applied Mechanics and Materials 792 (September 2015): 189–96. http://dx.doi.org/10.4028/www.scientific.net/amm.792.189.

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This paper investigates a multilevel combined NPC converter for medium-and high-power energy storage systems and active power filters. The proposed multilevel NPC converter is composed of a parallel connection of multiple NPC converters using the current sharing reactors and involves the phase shifted PWM strategy for better energy quality performance. Using the switching function-based mathematical model, the proposed multilevel converter is evaluated to show the energy quality performance and fault tolerance of an energy storage system or active power filter. In addition, the switching frequency of circulating currents is analyzed to obtain its relationship with the converter parameters and maximum sharing reactor current ripple. The performance of the proposed multilevel converter is verified by simulation.
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Quester, Matthias, Fisnik Loku, Otmane El Azzati, Leonel Noris, Yongtao Yang, and Albert Moser. "Investigating the Converter-Driven Stability of an Offshore HVDC System." Energies 14, no. 8 (April 20, 2021): 2341. http://dx.doi.org/10.3390/en14082341.

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Offshore wind farms are increasingly built in the North Sea and the number of HVDC systems transmitting the wind power to shore increases as well. To connect offshore wind farms to adjacent AC transmission systems, onshore and offshore modular multilevel converters transform the transmitted power from AC to DC and vice versa. Additionally, modern wind farms mainly use wind turbines connected to the offshore point of common coupling via voltage source converters. However, converters and their control systems can cause unwanted interactions, referred to as converter-driven stability problems. The resulting instabilities can be predicted by applying an impedance-based analysis in the frequency domain. Considering that the converter models and system data are often confidential and cannot be exchanged in real systems, this paper proposes an enhanced impedance measurement method suitable for black-box applications to investigate the interactions. A frequency response analysis identifies coupling currents depending on the control system. The currents are subsequently added to the impedance models to achieve higher accuracy. The proposed method is applied to assess an offshore HVDC system’s converter-driven stability, using impedance measurements of laboratory converters and a wind turbine converter controller replica. The results show that the onshore modular multilevel converter interacts with AC grids of moderate short-circuit ratios. However, no interactions are identified between the offshore converter and the connected wind farm.
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Buswig, Y. M. Y., Wahyu Mulyo Utomo, Zainal Alam Haron, and S. S. Yi. "Multi-Input Boost Converter for Hybrid PV and Wind Generator Systems." Advanced Materials Research 925 (April 2014): 619–24. http://dx.doi.org/10.4028/www.scientific.net/amr.925.619.

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A renewable energy source that works alone can’t achieve customers’ requirements for a stable power supply. Therefore, the paper proposes a multi-input converter for hybrid renewable energy system. This converter is designed for two input sources, PV and wind generator in order to design high efficiency and high performance converters for renewable energy applications. The proposed multi-input converter is composed by interleaved technique with two step-up converters and the two inputs are accommodated with some extra semiconductors, inductances and diodes. The modes of operation based on the status of the four switches, where S1 and S2 operate as main switches in order to deliver energy from both voltage sources. A constant output power to the load is provided by switching S3 switch, which guarantied the appropriate output voltage by reduce the ripple and improve the reliability. Simulations of multi-input converter has been performed using MATLAB/SIMULINK. The simulation results confirm the validity of the proposed method, which can be seen as a promising new topology that ensure multi-input converter suitable for renewable energy applications.
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Dissertations / Theses on the topic "Converter systems"

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Patil, Sandeep. "Analysis and Loss Estimation of Different Multilevel DC-DC Converter Modulesand Different Proposed Multilevel DC-DC Converter Systems." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1396628125.

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Price, Alexandra A. E. "New perspectives on wave energy converter control." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3109.

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This work examines some of the fundamental problems behind the control of wave energy converters (WECs). Several new perspectives are presented to aid the understanding of the problem and the interpretation of the literature. The first of these is a group of methods for classifying control of WECs. One way to classify control is to consider the stage of power transfer from the wave to the final energy carrier. Consideration of power transfer can also be used to classify WECs into families. This approach makes it possible to classify all WECs, including those that had previously eluded classification. It also relates the equations of motion of different classes of WECs to a generalised equation of motion. This in turn clarifies why some types of control are suited to some WECs, but not others. These classification systems are used to demarcate the boundary for the theoretical work that follows. The theory applies to WECs with governing equations of motion that are linear, and to control systems that are linear, aim to maximise power, and which regulate the PTO stage of power flow. Another important perspective is the new wet and dry oscillator paradigm, which is used to differentiate between frequency domain modelling and a commonly used technique, monochromatic modelling. This distinction is necessary background for many of the new ideas discussed. It is used to resolve an ongoing debate in wave energy research: whether frequency domain modelling can be applied to cases that are not monochromatic. It is the key to an extension to the theory of capture width, a widely used performance indicator. This distinction is also the rationale behind an improved method of presenting frequency domain results: the frequency responses due to both monochromatic and polychromatic forcing are represented on the same graph. These responses are different because the optimal control problem is acausal, a topic that is also discussed in depth. This visual tool is used to investigate and confirm various ideas about the control of WECs, and to demonstrate how the newly redefined capture width encapsulates the essential control problem of WECs. The optimal control problem is said to be acausal because information about the future is required to achieve optimal control. Another vantage point offered is that of the duration of the prediction interval required for optimal control. This is given by a new parameter emerging from this work, which has been termed the premonition time. The premonition time depends on the amount of knowledge required, which is determined by the geometry of the WEC, and the amount of information available, which is largely determined by the bandwidth of the sea state. The new perspectives introduced are the various systems of classification, the wet and dry oscillator paradigm, the presentation of monochromatic and polychromatic results on the same axes, premonition time, and the revised theory on capture width. These are all used to discuss the interrelationship between WEC geometry, the control strategy and the sea-state. The opportunities for, and limitations of, the use of intelligent control techniques such as artificial neural networks are discussed. The potential contribution of various control strategies and associated design principles is explored. This discussion culminates in a series of recommendations for control strategies that are suited to each class of WEC, and for the areas of research that have the potential to bring about the greatest reductions in the cost of harnessing energy from sea waves.
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Gow, John A. "Modelling, simulation and control of photovoltaic converter systems." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/6871.

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The thesis follows the development of an advanced solar photovoltaic power conversion system from first principles. It is divided into five parts. The first section shows the development of a circuit-based simulation model of a photovoltaic (PV) cell within the 'SABER' simulator environment. Although simulation models for photovoltaic cells are available these are usually application specific, mathematically intensive and not suited to the development of power electronics. The model derived within the thesis is a circuit-based model that makes use of a series of current/voltage data sets taken from an actual cell in order to define the relationships between the cell double-exponential model parameters and the environmental parameters of temperature and irradiance. Resulting expressions define a 'black box' model, and the power electronics designer may simply specify values of temperature and irradiance to the model, and the simulated electrical connections to the cell provide the appropriate I/V characteristic. The second section deals with the development of a simulation model of an advanced PVaware DC-DC converter system. This differs from the conventional in that by using an embedded maximum power tracking system within a conventional linear feedback control arrangement it addresses the problem of loads which may not require the level of power available at the maximum power point, but is also able to drive loads which consistently require a maximum power feed such as a grid-coupled inverter. The third section details a low-power implementation of the above system in hardware. This shows the viability of the new, fast embedded maximum power tracking system and also the advantages of the system in terms of speed and response time over conventional systems. The fourth section builds upon the simulation model developed in the second section by adding an inverter allowing AC loads (including a utility) to be driven. The complete system is simulated and a set of results obtained showing that the system is a usable one. The final section describes the construction and analysis of a complete system in hardware (c. 500W) and identifies the suitability of the system to appropriate applications.
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Borisov, Konstantin A. "Multifunctional voltage source converter for shipboard power systems." Diss., Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-06042007-142951.

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Li, Quan, and q. li@cqu edu au. "DEVELOPMENT OF HIGH FREQUENCY POWER CONVERSION TECHNOLOGIES FOR GRID INTERACTIVE PV SYSTEMS." Central Queensland University. School of Advanced Technologies & Processes, 2002. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20020807.152750.

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This thesis examines the development of DC-DC converters that are suitable for Module Integrated Converters, (MICs), in grid interactive photovoltaic (PV) systems, and especially concentrates on the study of the half bridge dual converter, which was previously developed from the conventional half bridge converter. Both hard-switched and soft-switched half bridge dual converters are constructed, which are rated at 88W each and transform a nominal 17.6Vdc input to an output in the range from 340V to 360Vdc. An initial prototype converter operated at 100kHz and is used as a base line device to establish the operational behaviours of the converter. The second hard-switched converter operated at 250kHz and included a coaxial matrix transformer that significantly reduced the power losses related to the transformer leakage inductance. The soft-switched converter operated at 1MHz and is capable of absorbing the parasitic elements into the resonant tank. Extensive theoretical analysis, simulation and experimental results are provided for each converter. All three converters achieved conversion efficiencies around 90%. The progressive increases in the operation frequency, while maintaining the conversion efficiency, will translate into the reduced converter size and weight. Finally different operation modes for the soft-switched converter are established and the techniques for predicting the occurrence of those modes are developed. The analysis of the effects of the transformer winding capacitance also shows that soft switching condition applies for both the primary side mosfets and the output rectifier diodes.
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Lee, Choong Hoon. "Design of high speed low voltage data converters for UWB communication systems." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3798.

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For A/D converters in ultra-wideband (UWB) communication systems, the flash A/D type is commonly used because of its fast speed and simple architecture. However, the number of comparators in a flash A/D converter exponentially increases with an increase in resolution; therefore, an interpolating technique is proposed in this thesis to mitigate the exponential increase of comparators in a flash converter. The proposed structure is designed to improve the system bandwidth degradation by replacing the buffers and resistors of a typical interpolating technique with a pair of transistors. This replacement mitigates the bandwidth degradation problem, which is the main drawback of a typical interpolating A/D converter. With the proposed 4-bit interpolating structure, 3.75 of effective number of bits (ENOB) and 31.52dB of spurious-free dynamic range (SFDR) are achieved at Nyquist frequency of 264MHz with 6.93mW of power consumption. In addition, a 4-bit D/A converter is also designed for the transmitter part of the UWB communication system. The proposed D/A converter is based on the charge division reference generator topology due to its full swing output range, which is attractive for low-voltage operation. To avoid the degradation of system bandwidth, resistors are replaced with capacitors in the charge division topology. With the proposed D/A converter, 0.26 LSB of DNL and 0.06 LSB of INL is obtained for the minimum input data stream width of 1.88ns. A 130 µm ×286 µm chip area is required for the proposed D/A converter with 19.04mW of power consumption. The proposed A/D and D/A converter are realized in a TSMC 0.18 µm CMOS process with a 1.8 supply voltage for the 528MHz system frequency.
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James, Peter Andrew. "Health monitoring of IGBTs in automotive power converter systems." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/health-monitoring-of-igbts-in-automotive-power-converter-systems(224a6b3c-a1f0-4379-9ff7-eb5603f8deb9).html.

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The use of IGBT power modules in the automotive industry is becoming increasingly common as manufacturers develop more hybrid and all electric vehicles. In an industry such as this, the reliability of a component is critical and vehicle manufacturers have conducted much research into diagnostic and prognostic systems for internal combustion engines that run in real time on the vehicle to determine when components will fail. Power electronic components do not have similar prognostics available. The traditional use of power electronic modules has been in applications where their life or duty cycle is well defined, and accelerated life tests are carried out to determine a mean time to failure. This type of prognostics is not appropriate for the automotive industry because the operating cycle of the vehicle varies greatly, both in driving style, duty cycle and environment. A new type of prognostics is therefore required which will calculate the life remaining in the power module in real time as the device is being used.Because of the high robustness of IGBT power modules, testing for time to failure can be a very lengthy process. A novel procedure and test rig based on Peltier effect thermoelectric coolers was developed, which can automatically temperature cycle IGBT power modules in a very short time and determine their life expectancy, all within their operating specifications. This was tested using several power modules. The failure modes of IGBT power modules are also investigated with a view to developing a failure prediction algorithm. The causes of failure are analysed and a prognostics algorithm is proposed. This prognostics algorithm uses thermal cycle history as a means to predict the life consumed for the power module. The data obtained by the accelerated life tests is used to calculate the coefficients for the prognostic algorithm. A simulation of a vehicle drive cycle is used to show how the prognostics algorithm can be used, and a value indicating the extent to which the IGBT power module has aged is calculated. It is also proved that by intelligently controlling the heat flowing from the heat sink on which the power module is mounted, the life of the IGBT power module can be increased by approximately three times.Hardware and software were developed to implement the health monitoring algorithm. Measurement and control circuits were designed, built and tested together with software that processes the input data, records the thermal cycle history of the IGBT power modules and calculates a value of age for the IGBT power modules in real time. This was tested on several modules to prove the validity of the algorithm.The new algorithms and methodology developed could enable vehicle manufacturers to predict the failure of power modules in hybrid and all electric vehicles. This technology could also benefit other industries such as the renewables (eg wind turbines) and aerospace, where the industry is moving towards all electric aircraft.
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Trilla, Romero Lluís. "Power converter optimal control for wind energy conversion systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/134602.

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L'energia eòlica ha incrementat la seva presència a molts països i s'espera que tingui encara un pes més gran en la generació elèctrica amb la implantació de la tecnologia eòlica marina. En aquest context el desenvolupament de models dels Sistemes de Generació per Turbina de Vent (SGTV) precisos és important pels operadors de xarxa per tal d'avaluar-ne el comportament. Els codis de xarxa ofereixen un seguit de normes per validar models amb dades obtingudes de proves de camp. A la primera part d'aquesta tesi un model de SGTV amb màquina d'inducció doblement alimentada (DFIG) és validat d'acord amb les normatives espanyola i alemanya. Avui dia molts parc eòlics utilitzen DFIG i, en conseqüència, les dades de camp disponibles son per aquesta tecnologia. Per a la indústria eòlica marina un avanç prometedor son els SGTV amb generadors síncrons d'imants permanents (PMSG). Per aquesta raó la segona part d'aquesta tesi es centra en SGTV basats en PMSG amb convertidor back-to-back de plena potència. Aquest convertidor es pot dividir en dues parts: el costat de xarxa (GSC) que interactua amb la xarxa elèctrica i el costat de màquina (MSC) que controla el generador. En general, el sistema de control del convertidor recau en els tradicionals controladors PI i, en ocasions, incorpora desacoblaments per reduir les influencies creuades entre les variables. Aquest controlador pot ser sintonitzat i implementat fàcilment donat que la seva estructura és simple, però, no presenta una resposta ideal donat que no aprofita tots els graus de llibertat disponibles en el sistema. És important desenvolupar controladors fiables que puguin oferir una resposta previsible del sistema i proveir robustesa i estabilitat. En especial per zones on la presència eòlica és gran i per parcs eòlics connectats a xarxes dèbils. En aquest treball es proposa un sistema de control pel convertidor basat en teoria de control H-infinit i en controladors Lineals amb Paràmetres Variants (LPV). La teoria de control òptim proveeix un marc de treball on més opcions es poden tenir en consideració a l'hora de dissenyar el controlador. En concret la teoria de control H-inifinit permet crear controladors multivariables per tal d'obtenir una òptima resposta del sistema, proveir certa robustesa i assegurar l'estabilitat. Amb aquesta tècnica durant la síntesi del controlador el pitjor cas de senyals de pertorbació és contemplat, d'aquesta manera el controlador resultant robustifica l'operació del sistema. Es proposa aquest control per al GSC posant especial èmfasi en obtenir un control de baixa complexitat que mantingui els beneficis d'aplicar la teoria de control òptim i faciliti la seva implementació en computadors industrials. Pel MSC es proposa una estratègia diferent basada en control LPV donat que el punt d'operació del generador canvia constantment. El sistema de control basat en LPV és capaç d'adaptar-se dinàmicament al punt d'operació del sistema, així s'obté en tot moment la resposta definida durant el procés de disseny. Amb aquesta tècnica l'estabilitat del sistema sobre tot el rang d'operació queda garantida i, a més, s'obté una resposta predictible i uniforme. El controlador està dissenyat per tenir una estructura simple, com a resultat s'obté un control que no és computacionalment exigent i es proveeix una solució que pot ser utilitzada amb equips industrials. S'utilitza una bancada de proves que inclou el PMSG i el convertidor back-to-back per tal d'avaluar experimentalment l'estratègia de control dissenyada al llarg d'aquest treball. L'enfoc orientat a la implementació dels controls proposats facilita el seu ús amb el processador de senyals digitals inclòs a la placa de control de la bancada. Els experiments realitzats verifiquen en un ambient realista els beneficis teòrics i els resultats de simulació obtinguts prèviament. Aquestes proves han ajudat a valorar el funcionament dels controls en un sistema discret i la seva tolerància al soroll de senyals i mesures
Wind energy has increased its presence in many countries and it is expected to have even a higher weight in the electrical generation share with the implantation of offshore wind farms. Consequently, the wind energy industry has to take greater responsibility towards the integration and stability of the power grid. In this sense, there are proposed in the present work control systems that aim to improve the response and robustness of the wind energy conversion systems without increasing their complexity in order to facilitate their applicability. In the grid-side converter it is proposed to implement an optimal controller with its design based on H-infinity control theory in order to ensure the stability, obtain an optimal response of the system and also provide robustness. In the machine-side converter the use of a Linear Parameter-Varying controller is selected, this choice provides a controller that dynamically adapts itself to the operating point of the system, in this way the response obtained is always the desired one, the one defined during the design process. Preliminary analysis of the controllers are performed using models validated with field test data obtained from operational wind turbines, the validation process followed the set of rules included in the official regulations of the electric sector or grid codes. In the last stage an experimental test bench has been developed in order to test and evaluate the proposed controllers and verify its correct performance.
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Mino, Kazuaki. "Novel hybrid unidirectional three-phase AC-DC converter systems /." [S.l.] : [s.n.], 2009. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18185.

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Christoforidis, George P. "Harmonic analysis of power systems connected to converter substations." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/14994.

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Books on the topic "Converter systems"

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com, Timezoneconverter. Time zone converter. [S.l.]: Timezoneconverter.com, 1998.

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Luo, Wensheng, Yunfei Yin, Xiangyu Shao, Jianxing Liu, and Ligang Wu. Advanced Control Methodologies For Power Converter Systems. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94289-2.

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del Giudice, Davide, Federico Bizzarri, Daniele Linaro, and Angelo Maurizio Brambilla. Modular Multilevel Converter Modelling and Simulation for HVDC Systems. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-12818-9.

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Henryk, Tunia, ed. Automatic control of converter-fed drives. Amsterdam: Elsevier, 1994.

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Ruan, Xinbo, Li Zhang, Xinze Huang, Fei Liu, Guoping Zhu, and Shiqi Kan. Second Harmonic Current Reduction Techniques for Single-Phase Power Electronics Converter Systems. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1547-5.

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Gonzalez-Longatt, Francisco M., and José Luis Rueda Torres, eds. Modelling and Simulation of Power Electronic Converter Dominated Power Systems in PowerFactory. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-54124-8.

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Armin, Kemna, and Hosticka Bedrich J, eds. Modular low-power, high-speed CMOS analog-to-digital converter of embedded systems. Boston: Kluwer Academic Publishers, 2003.

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Daher, Se rgio. Analysis, design and implementation of a high efficiency multilevel converter for renewable energy systems. Kassel: Kassel Univ. Press, 2006.

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K, Kokula Krishna Hari, ed. Power Quality and System Level Control at Three-Phase Bidirectional Converter Interfaced with Micro Grid Systems: ICIEMS 2014. India: Association of Scientists, Developers and Faculties, 2014.

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Feng li fa dian zhong de dian li dian zi bian liu ji shu: Power electronic converter technology in wind power generation. Beijing Shi: Ji xie gong ye chu ban she, 2008.

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Book chapters on the topic "Converter systems"

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Barbi, Ivo, and Fabiana Pöttker. "Series Resonant Converter." In Power Systems, 33–69. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-96178-1_2.

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Barbi, Ivo, and Fabiana Pöttker. "LLC Resonant Converter." In Power Systems, 141–86. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-96178-1_6.

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Lee, Kyo-Beum, and June-Seok Lee. "Three-Level Converter Overview." In Power Systems, 1–24. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4992-7_1.

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Barbi, Ivo, and Fabiana Pöttker. "Asymmetric Half-Bridge ZVS-PWM Converter." In Power Systems, 271–95. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-96178-1_10.

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Barbi, Ivo, and Fabiana Pöttker. "Active Clamp ZVS-PWM Forward Converter." In Power Systems, 297–317. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-96178-1_11.

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Leonhard, Werner. "Control of Converter-supplied DC Drives." In Power Systems, 139–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56649-3_10.

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Barbi, Ivo, and Fabiana Pöttker. "Half Bridge CVC-PWM Series Resonant Converter." In Power Systems, 93–113. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-96178-1_4.

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Dutta Roy, Suhash Chandra. "Triangular to Sine-Wave Converter." In Circuits, Systems and Signal Processing, 217–21. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6919-2_29.

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Patil, Mahesh, and Pankaj Rodey. "Buck Converter in Open Loop." In Control Systems for Power Electronics, 21–27. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2328-3_4.

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Patil, Mahesh, and Pankaj Rodey. "Buck Converter in Closed Loop." In Control Systems for Power Electronics, 29–37. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2328-3_5.

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Conference papers on the topic "Converter systems"

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Castagnetti, Davide. "Experimental Comparison Between a Fractal-Inspired Multi-Frequency Piezoelectric Energy Converter and a Traditional Converter." In ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3020.

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Harvesting energy from ambient vibrations in order to power autonomous sensors is a challenging issue. The aim of this work is to compare the power output from an innovative multi-frequency fractal-inspired piezoelectric converter to that from a traditional multi-cantilever piezoelectric converter. The converters are designed in order to give the same eigenfrequencies in a given range and a prototype of both is built using commercial materials. The experimental tests investigate both the effect of the acceleration and of the resistive load applied to the converters for each of the three eigenfrequencies in the range between 0 and 120 Hz. The fractal-inspired converter exhibits a significantly higher specific output power at the first and third of the eigenfrequencies investigated.
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Vu, T. V., F. Diaz, and C. S. Edrington. "Sequence Based Control for Electro-thermal Management of Next Generation Integrated Power Systems." In International Ship Control Systems Symposium. IMarEST, 2018. http://dx.doi.org/10.24868/issn.2631-8741.2018.023.

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An individual switching technique for semi-conductor components of power converters presents an individual electrical and thermal output performance. Therefore, understanding the switching patterns or sequence and their effect can significantly improve the overall performance of the power converters. In this paper, a sequence based control methodology for a power converter system to optimize its electrical and thermal performance will be presented, analysed, and discussed. The method includes modelling the converter system with respect to a sequence of switching events, defining and formulating the control objectives into a form of a cost function, and solving the cost function for the optimal electrical performance.
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Ginn III, H. L., J. D. Bakos, Fred Flinstone, and A. Benigni. "Fast Coordination of Power Electronic Converters for Energy Routing in Shipboard Power Systems." In International Ship Control Systems Symposium. IMarEST, 2018. http://dx.doi.org/10.24868/issn.2631-8741.2018.024.

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A long-term goal of future naval shipboard power systems is the ability to manage energy flow with sufficient flexibility to accommodate future platform requirements such as, better survivability, continuity, and support of pulsed and other demanding loads. To attain this vision of shipboard energy management, shipboard power and energy management systems must coordinate operation of all major components in real-time. The primary components of a shipboard power system are the generators, energy storage modules, and increasingly power electronics that interface those sources and main load centers to the system. Flexible management of energy flow throughout shipboard distribution systems can be realized by automated coordination of multiple power electronic converters along with storage and generation systems. Use of power converters in power distribution systems has continuously increased due to continued development of the power electronics building blocks (PEBB) concept which reduces cost and increasing reliability of converters. Recent developments in SiC power devices are yielding PEBBs with far greater switching frequencies than Si based devices resulting in an order of magnitude reduction of the time scales as compared to converter systems utilizing conventional IGBT based PEBBs. In addition there have also been advancements in highly modularized converter systems with hundreds of PEBBs such as the Modular Multilevel Converter. Both of those trends have resulted in the continued evolution of the Universal Controller Architecture which attempts to standardize control interfaces for modular power electronic systems. Further development of interface definitions and increasing communication and computational capabilities of new FPGA based controllers provides opportunities beyond simply supporting SiC PEBBs. Fast control coordination across the system using an appropriate communication architecture provides a degree of energy management not previously realizable in shipboard power systems. The paper will present recent research results in networked control architectures for power electronic converter coordination and control. It will demonstrate that current FPGA and gigabit speed serial communication technologies allow for a very high degree of energy flow control.
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Laury, John, Lars Abrahamsson, and Math Bollen. "Transient Stability of Rotary Frequency Converter Fed Low Frequency Railway Grids: The Impact of Different Grid Impedances and Different Converter Station Configurations." In 2018 Joint Rail Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/jrc2018-6247.

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One method of strengthening low frequency AC railway grids is to upgrade Booster Transformer (BT) catenary systems, to Auto Transformer (AT) catenary systems. An AT catenary system has lower equivalent impedance compared to a BT system. Thus, an upgrade makes the existing converter stations electrically closer. Converter stations may have different types of Rotary Frequency Converters (RFCs) installed in them, and it is not well explored how different RFCs behaves and interact during and after a large disturbance. Using the Anderson-Fouad model of synchronous machines to describe the dynamics of RFCs, several case studies have been performed through numerical simulations. The studies investigate the interactions within and between converter stations constituted with different RFC types, for BT as well AT catenary systems. The numerical studies reveal that replacing BT with AT catenary systems, results in a more oscillatory system behaviour. This is seen for example in the power oscillations between and inside converter stations, after fault clearance.
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Kogler, Helmut, Rudolf Scheidl, and Michael Ehrentraut. "A Simulation Model of a Hydraulic Buck Converter Based on a Mixed Time Frequency Domain Iteration." In ASME/BATH 2013 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fpmc2013-4409.

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Digital hydraulics is an opportunity to realize simple, robust, cheap and energy efficient hydraulic drives. In such systems digital on/off valves are used instead of proportional valves. Moreover, in hydraulic switching converters the valves are actuated within a few milliseconds, which create sharp pressure changes and, in turn, significant wave propagation effects in the pipe system. For a proper design of digital hydraulic systems a sound understanding of these effects is required to achieve the desired behavior of the switching drive system. In such converters, like the buck-, boost or boost-buck-converter, the inductance is one crucial component. It is realized by a simple pipe mainly for cost reasons. Furthermore, switching converters contain some components with nonlinear characteristics, like valves or accumulators, which prevent a comprehensive analysis in frequency domain. For a convenient analysis a qualified model of a hydraulic buck converter based on a mixed time frequency domain iteration is presented. Main parameters of this model are identified and wave propagation effects in the inductance pipe of the converter are investigated by simulation.
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R. F. B. de Souza, Victor, Luciano S. Barros, and Flavio B. Costa. "Performance Comparison of Converter Topologies for Double Fed Induction Generator-based Wind Energy Conversion Systems." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1512.

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The advancements in power electronics have supported the widespread penetration of wind energy conversion systems (WECS) in electric grids. In this context, power converters have crucial functionality in the control of active and reactive power injection, moreover they are directly related to voltage and current harmonic distortion levels, mechanical and thermal stress that are experienced by the wind turbine. Currently, several topologies have been tested in order to improve the performance and increase the power processing of WECS to support the network demand. Based on the relevance of this issue, this paper presents a performance comparison of a Double Fed Induction Generator(DFIG)-based WECS employing three topologies of back-toback converters: two-level voltage source converter topology (2L-VSC), neutral point clamped (NPC) and modular multilevel converter (MMC). Simulation results present DFIG currents, voltages, torque, speed and the total harmonic distortion (THD), highlighting the performance improvement employing multilevel topologies and the impacts of using each topology.
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Wei, Yijin, and Denise A. McKahn. "Minimization of Stack Mass in Miniature PEM Fuel Cell Systems With DC/DC Converters." In ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2017 Power Conference Joint With ICOPE-17, the ASME 2017 11th International Conference on Energy Sustainability, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fuelcell2017-3713.

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Polymer electrolyte membrane (PEM) fuel cells have been explored as a clean battery replacement in portable and miniature applications where total system mass and specific energy density (Wh/kg) are critical design constraints. By coupling a boost (step-up) DC/DC converter with a miniature PEM fuel cell stack, the total power system mass can be reduced while providing voltage regulation capabilities not available with a fuel cell alone. This configuration is applied to the design of a controlled meteorological (CMET) balloon power system as a case-study. In this work, we designed and tested three different micro-power DC/DC boost converters that were deployed in series with a PEM fuel cell stack. Testing of the converters revealed a transition region in which the converter output voltage is hysteretic, not well regulated, and dependent on the input voltage. As a result, it is important to identify the minimal stable and reliable input voltage to a given DC/DC converter in order to minimize the fuel cell power system mass. An optimization strategy is presented here that enables the minimization of PEM fuel cell stack mass by identifying the appropriate DC/DC converter input voltage subject to the dimension constraints of the fuel cell components. Prototype DC/DC converters were then experimentally tested in direct connection to a miniature two-cell PEM fuel cell stack.
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Castagnetti, Davide. "A Fractal-Inspired Multi-Frequency Piezoelectric Energy Converter: Computational and Experimental Characterization." In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-7962.

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In order to develop self-powered wireless sensor nodes, many energy harvesting devices, able to convert freely available ambient energy into electrical energy, have been proposed in the literature. A promising technique, in terms of simplicity and high conversion efficiency, is the harvesting of ambient kinetic energy through piezoelectric materials. The aim of this work is to design and investigate the modal response and the power output of a fractal-inspired, multi-frequency, piezoelectric energy converter, previously presented by the author. Two are the steps of the work. First, a computational modal analysis of the converter is performed. Second, a physical prototype of the converter is built and its eigenfrequencies and power generation under different resistive loads are experimentally examined in the range between 0 and 120 Hz. The converter exhibits three eigenfrequencies and a good power output, in particular at the first eigenfrequency.
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R. F. B. de Souza, Victor, Luciano S. Barros, and Flavio B. Costa. "Performance Comparison of 2L-VSC, 3L-NPC, and 3L-MMC Converter Topologies for Interfacing Grid-Connected Systems." In Simpósio Brasileiro de Sistemas Elétricos - SBSE2020. sbabra, 2020. http://dx.doi.org/10.48011/sbse.v1i1.2297.

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Nowadays, power converters play a fundamental role in the conditioning and processing of active and reactive power, and are directly related to power quality indexes. In this sense, new multi-level converter topologies have been integrated in order to provide higher power processing capacity with lower harmonic distortion, switch stress, heating, and losses. The use of these structures compared to conventional two-level converters is especially suitable for high power of the order of megawatt. Considering the relevance of this approach, this paper presents a comparative performance analysis among the conventional two-level topology (2L-VSC) and two multilevel topologies in a grid-connected system: neutral point clamped (NPC) and modular multilevel converter (MMC). Simulation test results present the impacts on voltages and currents for the switches and the whole system, as well as the evaluation of the total harmonic distortion (THD) in order to highlight the crucial points of each topology for this kind of application.
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Annakkage, Udaya. "Converter Control for Integration of Renewable Energy into the Grid." In The SLIIT International Conference on Engineering and Technology 2022. Faculty of Engineering, SLIIT, 2022. http://dx.doi.org/10.54389/zjvh8872.

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Generation of electricity using renewable sources of energy will be the only option available to us soon. This may happen within the next two decades. In the meantime, we make the transition form traditional synchronous generator driven power systems to fully renewable energy-based power systems where the energy source is integrated through power electronics converters. We must start thinking in a new way. This presentation will address the technological challenges associated with connecting renewables to the grid through converters and the options available to meet those challenges. While the ability of the converters to respond fast is an obvious advantage, unlike the synchronous generator, it does not have a rotating mass that stores kinetic energy. The short-term overcurrent rating of the converter is much less than that of a synchronous generator unless the converter is overdesigned. Addressing these engineering challenges will be discussed in the presentation.
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Reports on the topic "Converter systems"

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Bundschuh, Paul. 3-Port Single-Stage PV & Battery Converter Improves Efficiency and Cost in Combined PV/Battery Systems. Office of Scientific and Technical Information (OSTI), March 2013. http://dx.doi.org/10.2172/1157556.

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Englebretson, Steven, Wen Ouyang, Colin Tschida, Joseph Carr, V. R. Ramanan, Matthew Johnson, Matthew Gardner, et al. Advanced Direct-Drive Generator for Improved Availability of Oscillating Wave Surge Converter Power Generation Systems Final Technical Report. Office of Scientific and Technical Information (OSTI), May 2017. http://dx.doi.org/10.2172/1356751.

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Tarasenko, Roman A., Viktor B. Shapovalov, Stanislav A. Usenko, Yevhenii B. Shapovalov, Iryna M. Savchenko, Yevhen Yu Pashchenko, and Adrian Paschke. Comparison of ontology with non-ontology tools for educational research. [б. в.], June 2021. http://dx.doi.org/10.31812/123456789/4432.

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Providing complex digital support for scientific research is an urgent problem that requires the creation of useful tools. Cognitive IT-platform Polyhedron has used to collect both existing informational ontology- based tools, and specially designed to complement a full-stack of instruments for digital support for scientific research. Ontological tools have generated using the Polyhedron converter using data from Google sheets. Tools “Search systems”, “Hypothesis test system”, “Centre for collective use”, “The selection of methods”, “The selection of research equipment”, “Sources recommended by Ministry of Education and Science of Ukraine”, “Scopus sources”, “The promising developments of The National Academy of Sciences of Ukraine” were created and structured in the centralized ontology. A comparison of each tool to existing classic web-based analogue provided and described.
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Calebrese, Christopher, David Smith, Lili Zhang, and Wesley Zhong. Resistively Graded Insulation System for Next-Generation Converter-Fed Motors. Office of Scientific and Technical Information (OSTI), October 2018. http://dx.doi.org/10.2172/1483295.

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Ayyanar, Raja, and Enrique Ledezma. Towards a Fully Modular Power System Architecture for DC-DC Converters. Fort Belvoir, VA: Defense Technical Information Center, January 2006. http://dx.doi.org/10.21236/ada443437.

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S. G. Johnson and K. L. Lively. Evaluation of Storage for Transportation Equipment, Unfueled Convertors, and Fueled Convertors at the INL for the Radioisotope Power Systems Program. Office of Scientific and Technical Information (OSTI), May 2010. http://dx.doi.org/10.2172/984546.

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Center, Christopher J. System Level Programming of the Preston Scientific Analog to Digital Converter on the LSI-11/23 Bus,. Fort Belvoir, VA: Defense Technical Information Center, August 1986. http://dx.doi.org/10.21236/ada175511.

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Ku, Daniel C. Multi-pulse Converters and Passive Filtering to Improve Power Harmonics in an Integrated Power System. Fort Belvoir, VA: Defense Technical Information Center, May 2007. http://dx.doi.org/10.21236/ada473260.

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Nelson, Alex, Stanford A. Gibson, and Alex Sanchez. Development of a two-dimensional HEC-RAS sediment model for the Chippewa River, Wisconsin, for software development and sediment trend analysis. U.S. Army Engineer Research and Development Center, June 2022. http://dx.doi.org/10.21079/11681/44561.

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This US Army Corps of Engineers (USACE) Regional Sediment Management technical note (RSM-TN) describes an RSM effort that converted a one-dimensional (1D) sediment transport model of the Chippewa River confluence with the Mississippi River into a two-dimensional (2D) model. This work leveraged recent sediment data collection and tested the new 2D sediment transport capabilities in the Hydrologic Engineering Center, River Analysis System (HEC-RAS) Version 6.0. In addition to the benefits of software testing, the resulting model developed through this effort can provide more accurate spatial and temporal information about sedimentation in the Mississippi River navigation channel and help inform future dredging strategies for the St. Paul District, USACE.
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Soloviev, Vladimir, Victoria Solovieva, Anna Tuliakova, Alexey Hostryk, and Lukáš Pichl. Complex networks theory and precursors of financial crashes. [б. в.], October 2020. http://dx.doi.org/10.31812/123456789/4119.

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Based on the network paradigm of complexity in the work, a systematic analysis of the dynamics of the largest stock markets in the world and cryptocurrency market has been carried out. According to the algorithms of the visibility graph and recurrence plot, the daily values of stock and crypto indices are converted into a networks and multiplex networks, the spectral and topological properties of which are sensitive to the critical and crisis phenomena of the studied complex systems. This work is the first to investigate the network properties of the crypto index CCI30 and the multiplex network of key cryptocurrencies. It is shown that some of the spectral and topological characteristics can serve as measures of the complexity of the stock and crypto market, and their specific behaviour in the pre-crisis period is used as indicators- precursors of critical phenomena.
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