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Letteratura scientifica selezionata sul tema "Medium Voltage DC"

Autore: Grafiati

Pubblicato: 19 ottobre 2024

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Articoli di riviste sul tema "Medium Voltage DC"

1

Vaishnavi, Gatla, C. Venkatesh, Madikonda Rumitha e Abhishek Shanmukhan. "Single-Input Dual-Output Three-Level DC–DC Converter for EV". International Journal of Advance Research and Innovation 10, n. 1 (2022): 48–53. http://dx.doi.org/10.51976/ijari.1012208.

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This paper presents the development of a non-isolated single-input dual-output three-level dc–dc converter (SIDO-TLC) appropriate for medium- and high-voltage applications. 3 level Buck-Boost converter is used in order to achieve the controllable output voltages. The main merits of this project include reducing voltage stress across semiconductor devices, improving efficiency, and reducing passive components size. This converter shows very good stability, even under simultaneous step changes of the loads and input voltage. Simulation analysis of converter output voltages for various duty cycles is presented for three cases of duty cycle control range.

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2

Kim, Minseung, Donghee Choi e Soo Hyoung Lee. "A DCM-Based Non-Isolated Step-Down DC Transformer". Energies 17, n. 4 (17 febbraio 2024): 940. http://dx.doi.org/10.3390/en17040940.

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DC transformers have emerged as essential devices for medium voltage DC (MVDC)-low voltage DC (LVDC) distribution systems. However, conventional step-down single-level converters have limits on the voltage level of the MVDC-LVDC distribution system. This paper proposes a non-isolated step-down (NISD) DC transformer based on discontinuous conduction mode (DCM). The proposed structure can withstand high voltage levels by sharing voltages between energy storage modules dividing voltage levels. The proposed NISD DC transformer determines operational modes based on energy storage modules and performs the voltage conversion process. The effectiveness of the proposed NISD DC transformer is verified based on a case study using a power system computer-aided design and electromagnetic transient simulation engine including DC (PSCAD/EMTDC™).

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3

Du, Sixing, Bin Wu, Kai Tian, David Xu e Navid R. Zargari. "A Novel Medium-Voltage Modular Multilevel DC–DC Converter". IEEE Transactions on Industrial Electronics 63, n. 12 (dicembre 2016): 7939–49. http://dx.doi.org/10.1109/tie.2016.2542130.

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4

Afridi, Muhammad Danial. "Isolated Cascaded DAB DC-DC Converter to Boost Medium DC Voltage to HVDC". Volume 21, Issue 1 21, n. 1 (30 giugno 2023): 1–6. http://dx.doi.org/10.52584/qrj.2101.01.

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The offshore wind farms typically use ac system to collect power from each generator, with the voltage increased by means of high, heavy step-up transformers. DC collection grids have also recently been taken into consideration as solution to simplify and minimize the offshore windfarm platforms. DC collection grids offer an additional method to reduce complexity of offshore windfarms. However, to increase the DC voltage for HVDC transmission requires the development of high-power and high voltage converters, which presents a technical challenge. This research makes use of an isolated cascaded dual active bridge (DAB) DC-DC converter to boost medium DC voltage to HVDC. Isolated Cascaded DAB DC-DC Converters are connected in series on the output side and in parallel on the input side to obtain a high transformation ratio and high power. The bidirectional DAB DC-DC converters cab be designed with power densities in the variability of tens to hundreds of kilowatts, depending on the components used and the switching frequency at which the converters function most effectively. The input parallel output series (IPOS) topology, 225 kV HVDC can be generated from a 5 kV MVDC input by cascading DAB DC-DC up to 30 stages. This converter family is useful due to its scalability and flexibility, since the power and voltage ratings can be increased while still using the same cells. MATLAB Simulink simulations are performed and verified the elementary operating characteristics of the system.

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5

Lin, Bor-Ren. "Soft Switching DC Converter for Medium Voltage Applications". Electronics 7, n. 12 (18 dicembre 2018): 449. http://dx.doi.org/10.3390/electronics7120449.

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A dc-dc converter with asymmetric pulse-width modulation is presented for medium voltage applications, such as three-phase ac-dc converters, dc microgrid systems, or dc traction systems. To overcome high voltage stress on primary side and high current rating on secondary side, three dc-dc circuits with primary-series secondary-parallel structure are employed in the proposed converter. Current doubler rectifiers are used on the secondary side to achieve low ripple current on output side. Asymmetric pulse-width modulation is adopted to realize soft switching operation for power switches for wide load current operation and achieve high circuit efficiency. Current balancing cells with magnetic component are used on the primary side to achieve current balance in each circuit cell. The voltage balance capacitors are also adopted on primary side to realize voltage balance of input split capacitors. Finally, the circuit performance is confirmed and verified from the experiments with a 1.44 kW prototype.

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Li, Zhenqiang, Huiwen He, Lei Wang, Le Gao, Min Zhang e Rui Fan. "A comprehensive evaluation method of DC voltage sag in medium-low medium–low voltage DC distribution system". Energy Reports 8 (novembre 2022): 345–56. http://dx.doi.org/10.1016/j.egyr.2022.10.140.

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7

Zheng, Shaoduo, e Feng Lyu. "Compact Medium Voltage DC/DC Converter Using Series-Connected Power Devices". Electronics 9, n. 6 (21 giugno 2020): 1024. http://dx.doi.org/10.3390/electronics9061024.

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Medium voltage (MV) DC/DC converters are key equipment for interconnection between DC power lines with different voltage levels in MVDC grids. The Input-series-output-parallel (ISOP) modular MV DC/DC converter is feasible to realize MV to low voltage (LV) conversion. However, a large number of LV modules in the converter may reduce the reliability and increase the complexity. This letter proposes a phase-shifted full-bridge MV DC/DC converter using series-connected power devices as switching modules. The converter is of low cost, simple structure, compact volume, and high reliability because these switching modules require only one external isolated driver circuit and very few components to achieve voltage sharing among series-connected power devices. The operation principle of the switching modules is analyzed, and the simulation and experimental results validate the feasibility of the converter design.

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8

Huang, Ming. "A Non-Isolated DC-DC Modular Multilevel Converter with Proposed Middle Cells". Electronics 11, n. 7 (2 aprile 2022): 1135. http://dx.doi.org/10.3390/electronics11071135.

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Unlike the modular multilevel converter (MMC) topology operated under the rectifier or inverter modes, control of the balanced state for the submodule (SM) capacitor voltage has emerged as the key issue for DC-DC MMCs. This is mainly caused by no balanced alternative powers being used for balancing SM capacitor voltages, which can be absorbed from the input or output DC sides of the converter. Typically, the alternative voltages and currents should be injected to achieve SM capacitor voltage balance in the DC-DC MMC. However, this solution is based on the cost of adopting the bulky LC filter components. For interconnecting different DC voltages in medium-voltage applications, this paper presents a non-isolated DC-DC MMC equipped with the proposed middle cells. It is intended to achieve DC voltage conversion without adopting bulky passive LC filters. On the one hand, the alternative currents, used for balancing the SM capacitor voltages, are arranged for flowing only within the phase legs of the proposed DC-DC MMC without disturbing the input current. On the other hand, through appropriate control of the middle cells, compensated components can be developed to eliminate the undesirable voltages on the output DC side. The middle cells of the proposed DC-DC MMC are supplied with the function of the active filter, which enables the DC-DC MMC system to escape the bulky LC components. Through theoretical analysis and a control strategy, the proposed DC-DC MMC has been analyzed comprehensively. Finally, the simulation and experimental results are verified to evaluate the effectiveness of the proposed DC-DC MMC.

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9

Alsokhiry, Fahad, e Grain Philip Adam. "Multi-Port DC-DC and DC-AC Converters for Large-Scale Integration of Renewable Power Generation". Sustainability 12, n. 20 (13 ottobre 2020): 8440. http://dx.doi.org/10.3390/su12208440.

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Numerous research studies on high capacity DC-DC converters have been put forward in recent years, targeting multi-terminal medium-voltage direct current (MVDC) and high-voltage direct current (HVDC) systems, in which renewable power plants can be integrated at both medium-voltage (MV) and high-voltage (HV) DC and AC terminals; hence, leading to complex hybrid AC-DC systems. Multi-port converters (MPCs) offer the means to promote and accelerate renewable energy and smart grids applications due to their increased control flexibilities. In this paper, a family of MPCs is proposed in order to act as a hybrid hub at critical nodes of complex multi-terminal MVDC and HVDC grids. The proposed MPCs provide several controllable DC voltages from constant or variable DC or AC voltage sources. The theoretical analysis and operation scenarios of the proposed MPC are discussed and validated with the aid of MATLAB-SIMULINK simulations, and further corroborated using experimental results from scale down prototype. Theoretical analysis and discussions, quantitative simulations, and experimental results show that the MPCs offer high degree of control flexibilities during normal operation, including the capacity to reroute active or DC power flow between any arbitrary AC and DC terminals, and through a particular sub-converter with sufficient precision. Critical discussions of the experimental results conclude that the DC fault responses of the MPCs vary with the topology of the converter adopted in the sub-converters. It has been established that a DC fault at high-voltage DC terminal exposes sub-converters 1 and 2 to extremely high currents; therefore, converters with DC fault current control capability are required to decouple the healthy sub-converters from the faulted one and their respective fault dynamics. On the other hand, a DC fault at the low-voltage DC terminal exposes the healthy upper sub-converter to excessive voltage stresses; therefore, sub-converters with bipolar cells, which possess the capacity for controlled operation with variable and reduced DC voltage over wide range are required. In both fault causes, continued operation without interruption to power flow during DC fault is not possible due to excessive over-current or over-voltage during fault period; however, it is possible to minimize the interruption. The above findings and contributions of this work have been further elaborated in the conclusions.

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Simiyu, Patrobers, Ai Xin, Kunyu Wang, George Adwek e Salman Salman. "Multiterminal Medium Voltage DC Distribution Network Hierarchical Control". Electronics 9, n. 3 (19 marzo 2020): 506. http://dx.doi.org/10.3390/electronics9030506.

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In this research study, a multiterminal voltage source converter (VSC) medium voltage DC (MVDC) distribution network hierarchical control scheme is proposed for renewable energy (RE) integration in a co-simulation environment of MATLAB and PSCAD/EMTDC. A DC optimal power flow (DC OPF) secondary controller is created in MATLAB. In PSCAD/EMTDC, the main circuit containing the adaptive DC voltage droop with a dead band and virtual synchronous generator (VSG) based primary controller for the VSCs is implemented. The simulation of the MVDC network under the proposed hierarchical control scheme is investigated considering variations in wind and solar photovoltaic (PV) power. The network is also connected to the standard IEEE-39 bus system and the hierarchical scheme tested by assessing the effect of tripping as well as restoration of the REs. The results show that during random variations in active power such as increasing wind and PV power generation, a sudden reduction or tripping of wind and PV power, the primary controller ensures accurate active power sharing amongst the droop-based VSCs as well as regulates DC voltage deviations within the set range of 0.98–1.02 pu with an enhanced dynamic response. The DC OPF secondary control optimizes the system’s losses by 38% regularly giving optimal droop settings to the primary controllers to ensure proper active power balance and DC voltage stability. This study demonstrates that the hierarchical control strategy is effective for RE integration in the MVDC distribution network.

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Più fonti

Tesi sul tema "Medium Voltage DC"

1

Thomas, Stephan [Verfasser]. "A Medium-Voltage Multi-Level DC/DC Converter with High Voltage Transformation Ratio / Stephan Thomas". Aachen : Shaker, 2014. http://d-nb.info/1049383176/34.

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2

Gowaid, Islam Azmy. "DC-DC converter designs for medium and high voltage direct current systems". Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27933.

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DC fault protection is one challenge impeding the development of multi-terminal dc grids. The absence of manufacturing and operational standards has led to many point-to-point HVDC links built at different voltage levels, which creates another challenge. Therefore, the issues of voltage matching and dc fault isolation in high voltage dc systems are undergoing extensive research and are the focus of this thesis. The modular multilevel design of dual active bridge (DAB) converters is analysed in light of state-of-the-art research in the field. The multilevel DAB structure is meant to serve medium and high voltage applications. The modular design facilitates scalability in terms of manufacturing and installation, and permits the generation of an output voltage with controllable dv/dt. The modular design is realized by connecting an auxiliary soft voltage clamping circuit across each semiconductor switch (for instance insulated gate bipolar transistor – IGBT) of the series switch arrays in the conventional two-level DAB design. With auxiliary active circuits, series connected IGBTs effectively become series connection of half-bridge submodules (cells) in each arm, resembling the modular multilevel converter (MMC) structure. For each half-bridge cell, capacitance for quasi-square wave (quasi two- level) operation is significantly smaller than typical capacitance used in MMCs. Also, no bulky arm inductors are needed. Consequently, the footprint, volume, weight and cost of cells are lower. Four switching sequences are proposed and analysed in terms of switching losses and operation aspects. A design method to size converter components is proposed and validated. Soft-switching characteristics of the analysed DAB are found comparable to the case of a two-level DAB at the same ratings and conditions. A family of designs derived from the proposed DAB design are studied in depth. Depending on the individual structure, they may offer further advantages in term of installed semiconductor power, energy storage, conduction losses, or footprint. A non-isolated dc-dc converter topology which offers more compact and efficient station design with respect to isolated DAB – yet without galvanic isolation – is studied for quasi two-level (trapezoidal) operation and compared to the isolated versions. In all the proposed isolated designs, active control of the dc-dc converter facilitates dc voltage regulation and near instant isolation of pole-to-pole and pole-to-ground dc faults within its protection zone. The same can be achieved for the considered non-isolated dc-dc converter topology with additional installed semiconductors. Simulation and experimental results are presented to substantiate the proposed concepts.

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3

LA, GANGA ALESSANDRO. "Feasibility study of a Medium Voltage DC/DC Converter adopting WBG devices". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2950484.

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4

Aboushady, Ahmed Adel. "Design, analysis, and modelling of modular medium-voltage DC/DC converter based systems". Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=18685.

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This thesis investigates the design and analysis of modular medium-voltage dc/dc converter based systems. An emerging converter application is feeding offshore oil and gas production systems located in deep waters, on the sea bed, distant from the onshore terminal. The phase-controlled series-parallel resonant converter (SPRC) is selected as the dc/dc converter unit, for a 10kV dc transmission system. The converter has a high efficiency in addition to favourable soft switching characteristics offered by resonant converters which enable high frequency operation, hence designs with reduced footprints. The phase-controlled SPRC is studied in the steady-state and a new analysis is presented for the converter operational modes, voltage gain sensitivity, and analytically derived operational efficiency. The maximum efficiency criterion is used as the basis for selection of converter full load operational conditions. The detailed design of the output LC filter involves new mathem atical expressions for interleaved multi-module operation. A novel large signal dynamic model is proposed for the phase-controlled SPRC with state feedback linearization. The model preserves converter large signal characteristics while providing a tool for faster simulation and simplified closed loop design and stability analysis. Using this model, a Kalman filter based estimator is proposed and applied for sensorless multi-loop output voltage control. The objective is to enhance the single-loop PI control dynamic response and closed loop stability with no additional sensors required for the inner loop state variables. Dynamic performance and robustness of the converter to operational circuit parameter variations are achieved with three new robust controllers; namely, Lyapunov, sliding mode, and predictive controllers. Finally, converter multi-module operation is studied, catering for voltage and current sharing of the subsea load-side step-down converter. To achieve a step- down voltage, the phase-controlled SPRC modules are connected in an input-series connection to share the medium level transmission voltage. Output-series and output-parallel connections are used to reach higher power levels. A new sensorless load voltage estimator is developed for converters remotely controlled. Matlab/Simulink simulations and experimental prototype results are used to substantiate all the proposed analysis techniques and control algorithms.

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Gebreab, Ermias K. "Interfacing of battery with a medium voltage DC-DC converter using MATLAB/Simulink". Kansas State University, 2013. http://hdl.handle.net/2097/15759.

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Master of Science
Department of Electrical and Computer Engineering
Sanjoy Das
Noel Schulz
Electrical power, although convenient form of energy to distribute and use, cannot easily be stored in large quantities economically. Most electrical power generated by utility plants is consumed simultaneously in real time. However, in some cases, energy storage systems become crucial when power generated from sources does not fulfill peak power load demand in a power system or energy storage systems are needed as backup. Due to these reasons, various technologies such as batteries, ultracapacitors (UC), superconducting magnetic energy storage (SEMS) and flywheels are beneficial options for energy storage systems. Shipboard power systems must use one or more energy storage systems in order to backup the existing power system if locally generated power is unavailable. This will lessen the effect of voltage sags on power quality, and improve system reliability. This report mainly focuses on the design of a Boost DC-DC converter and the integration of that converter with a previously designed battery storage model, as well as the effect of varying loads at the end of the converter.

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Cui, Shenghui [Verfasser], Doncker Rik W. [Akademischer Betreuer] De e Rainer [Akademischer Betreuer] Marquardt. "Modular multilevel DC-DC converters interconnecting high-voltage and medium-voltage DC grids / Shenghui Cui ; Rik W. de Doncker, Rainer Marquardt". Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1195238002/34.

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7

Zhao, Shishuo. "High Frequency Isolated Power Conversion from Medium Voltage AC to Low Voltage DC". Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/74969.

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Modern data center power architecture developing trend is analyzed, efficiency improvement method is also discussed. Literature survey of high frequency isolated power conversion system which is also called solid state transformer is given including application, topology, device and magnetic transformer. Then developing trend of this research area is clearly shown following by research target. State of art wide band gap device including silicon carbide (SiC) and gallium nitride (GaN) devices are characterized and compared, final selection is made based on comparison result. Mostly used high frequency high power DC/DC converter topology dual active bridge (DAB) is introduced and compared with novel CLLC resonant converter in terms of switching loss and conduction loss point of view. CLLC holds ZVS capability over all load range and smaller turn off current value. This is beneficial for high frequency operation and taken as our candidate. Device loss breakdown of CLLC converter is also given in the end. Medium voltage high frequency transformer is the key element in terms of insulation safety, power density and efficiency. Firstly, two mostly used transformer structures are compared. Then transformer insulation requirement is referred for 4160 V application according to IEEE standard. Solid insulation material are also compared and selected. Material thickness and insulation distance are also determined. Insulation capability is preliminary verified in FEA electric field simulation. Thirdly two transformer magnetic loss model are introduced including core loss model and litz wire winding loss model. Transformer turn number is determined based on core loss and winding loss trade-off. Different core loss density and working frequency impact is carefully analyzed. Different materials show their best performance among different frequency range. Transformer prototype is developed following designed parameter. We test the developed 15 kW 500 kHz transformer under 4160 V dry type transformer IEEE Std. C57.12.01 standard, including basic lightning test, applied voltage test, partial discharge test. 500 kHz 15 kW CLLC converter gate drive is our design challenge in terms of symmetry propagation delay, cross talk phenomenon elimination and shoot through protection. Gate drive IC is carefully selected to achieve symmetrical propagation delay and high common mode dv/dt immunity. Zero turn off resistor is achieved with minimized gate loop inductance to prevent cross talk phenomenon. Desaturation protection is also employed to provide shoot through protection. Finally 15 kW 500 kHz CLLC resonant converter is developed based on 4160V 500 kHz transformer and tested up to full power level with 98% peak efficiency.
Master of Science

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Bosich, Daniele. "Medium Voltage DC integrated power systems for large all electric ships". Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423756.

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The Medium Voltage Direct Current (MVDC) distribution represents a promising technology for future shipboard power systems. In such a topic, during the last years, universities and reserch centers have proposed technical solutions to achieve the important targets of MVDC technology, for instance fuel saving, reducing power system weight/space, reconfigurability in case of fault and enhanced power quality. Conversely, the main challenge to face regards voltage control, which has to be capable for guaranteeing the paramount requirement of stability. In regards to this aspect, a possible instability may arise due to the presence of high-bandwidth controlled load converters, modeled as Constant Power Loads (CPLs). Such non-linear loads are seen from the system as negative incremental resistances which are the cause of voltage instability in presence of a perturbation (e.g. load connection, generating system disconnection). The thesis has been realized in the Laboratory of Grid Connected and Marine Electric Power Generation and Control (EPGC Lab.), at the University of Trieste. The aim is to develop voltage control strategies to solve the CPL issue in a realistic multi-converter MVDC Integrated Power System, which is conveniently designed considering a real cruise line MVAC distribution. In such a system, voltage instability may be engage by different approaches, exploiting plant solutions (addition of dedicated filters, addition of energy storage devices) or control solutions. The latter is followed in this thesis: in this case voltage actuators (DC/DC power converters) are used to compensate for the voltage instability: therefore, on one hand (load side) power converters are responsible for the non-linear loads’ issue but, on the other (generators side), they may be utilized to contribute in its solution, thus ensuring a stable behavior. The stabilizing approach foresees the employment of different control techniques, whose theory is focused in the thesis. Starting from the simplier State Feedback (SF), two techniques are mostly studied in the multi-converter arrangement, i.e the Active Damping (AD) and the Linearization via State Feedback (LSF). The AD is a control method to transiently increase the filter resistances in order to damp the voltage oscillations: one of the main pros is the simple implementation on digital controllers, whereas the drawback regards its limited stabilizing action. Therefore, strategies based on Active Damping are to be used to stabilize non-critical systems. Conversely, LSF is a well-performing technique to obtain a notable cancellation of the non-linearities related to CPLs, by exploiting the DC/DC converters to apply a proper non-linear control function. Against the notable capability in stabilizing critical systems, great attention is to be paid in control function’s estimation: inaccurate system parameters or errors in controller’ feedbacks may invalidate the LSF approach, determining a partial loop-cancellation, therefore a non-linear resulting power system. Final simulations are aimed in testing AD and LSF, implemented in global and local control strategies: the former strategy has the purpose to solve the instability directly on CPLs, whereas the second one ensures the bus stability.
La distribuzione in media tensione continua (Medium Voltage Direct Current, MVDC) rappresenta una tecnologia promettente per i sistemi elettrici navali del futuro. A tal riguardo, negli ultimi anni, università e centri di ricerca hanno proposto soluzioni tecniche tali da raggiungere gli obiettivi propri della tecnologia MVDC: fra gli altri, risparmio di carburante, riduzione del peso/ingombro dell’impianto elettrico, riconfigurabilità a fronte di guasti e miglioramento della power quality. D’altra parte, la più grande sfida da affrontare riguarda la regolazione della tensione che deve risultare in grado di garantire il requisito fondamentale della stabilità. Relativamente a questo aspetto, una possibile instabilità si manifesta in presenza di convertitori di carico a banda elevata, modellizzabili come carichi a potenza costante (Constant Power Loads, CPLs). Tali carichi non-lineari vengono visti dal sistema come resistenze incrementali negative, le quali rappresentano la causa dell’instabilità della tensione a fronte di un disturbo (per esempio connessione di carico, disconnessione di un sistema di genenerazione). La tesi è stata realizzata presso il Laboratorio Grid Connected and Marine Electric Power Generation and Control (EPGC Lab.), presso l’Università degli Studi di Trieste. Lo scopo è quello di sviluppare strategie per il controllo della tensione in grado di risolvere la questione CPL, considerando un possibile impianto elettrico integrato (multi-convertitore) in MVDC, convenientemente progettato a partire dalla distribuzione reale MVAC di una nave da crociera. Nel sistema visto, l’instabilità di tensione può essere affrontata secondo diversi approcci, sfruttando soluzioni impiantistiche (aggiunta di filtraggio dedicato, aggiunta di energy storage) oppure soluzioni controllistiche. Il secondo approccio è quello seguito nella presente tesi: gli attuatori di tensione (convertitori DC/DC) vengono usati in questo caso per compensare l’instabilità di tensione. Quindi, da una parte (lato carico) i convertitori sono responsabili del problema dei carichi non-lineari, dall’altro (lato generatori) possono essere utilizzati per contribuire alla sua soluzione, garantendo un comportamento stabile. L’approccio stabilizzante previsto prevede l’utilizzo di diverse tecniche di controllo, analizzate nella tesi dal punto di vista teorico. A partire dalla tecnica semplice State Feedback (SF), altre due tecniche sono state studiate per il caso di sistema multi-converter, ovvero l’Active Damping (AD) e il Linearization via State Feedback (LSF). L’AD è un metodo di controllo per incrementare transitorialmente la resistenza dei filtri, in modo tale da smorzare le oscillazioni di tensione: uno dei principali vantaggi è quello relativo alla semplice ingegnerizzazione su controllori digitali, mentre lo svantaggio riguarda la limitata azione stabilizzante. Pertanto, strategie basate sull’AD devono considerarsi valide per stabilizzare sistemi non critici. D’altra parte, LSF è una tecnica molto valida per ottenere una buona cancellazione delle non-linearità dei CPL, per mezzo dell’azione di convertitori DC/DC in grado di applicare un’opportuna funzione di controllo non-lineare. A fronte di una notevole capacità nello stabilizzare sistemi critici, grande attenzione va posta nella stima della funzione di controllo: conoscenza inaccurata dei parametri o errori nei feedback ai controllori possono invalidare l’approccio LSF, causando una parziale cancellazione, quindi un sistema risultante non-lineare. Le simulazioni finali hanno lo scopo di testare le tecniche AD e LSF, implementate in strategie di controllo locale e globale: la prima strategia ha lo scopo di risolvere l’instabilità direttamente sui CPL, mentre la seconda assicura la stabilità del bus.

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9

Qi, Qi. "Benefit analysis of using soft DC links in medium voltage distribution networks". Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/114978/.

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Soft DC Links are power electronic converters enabling the control of power flow between distribution feeders or networks. This thesis considers the use of Soft DC Links in Medium Voltage (MV) distribution networks to improve network operation while facilitating the integration of distributed generators (DGs). Soft DC Links include Soft Open Points (SOPs) and Medium Voltage Direct Current (MVDC) links. An SOP can be installed to replace mechanical switchgear in a network, providing controllable active power exchange between connected feeders, as well as reactive power compensation at each interface terminal. The deployment of an MVDC link enables power and voltage controls over a wider area, and facilitates the effective use of available capacity between adjacent networks. The benefits of using SOP and MVDC link in MV distribution networks were investigated. A multi-objective optimisation framework was proposed to quantify the operational benefits of a distribution network with an SOP. An optimisation method integrating both global and local search techniques was developed to determine the set-points of an SOP. It was found that an SOP can improve network operation along multiple criteria and facilitate the integration capacity of DGs. A Grid Transformer-based control method of an MVDC link was proposed, which requires only measurements at the grid transformers to determine the operation of an MVDC link. Control strategies considering different objectives were developed. The proposed control method is used in the ANGLE-DC project, which aims to trial the first MVDC link in Europe by converting an existing AC circuit to DC operation. It was found that an MVDC link can significantly increase the network hosting capacity for DG connections while reducing network losses compared to an AC line. An impact quantification of Soft DC Links was carried out on statistically-similar distribution networks, which refer to a set of networks with similar but different topological and electrical properties. A model was developed to determine the optimal allocation of Soft DC Links. It was found that a Soft DC Link can reduce the network annual cost under a wide range of DG penetration conditions. The statistical analysis provides distribution network planners with more robust decisions on the implementation of Soft DC Links.

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Soltau, Nils Verfasser], Doncker Rik W. [Akademischer Betreuer] [De e Antonello [Akademischer Betreuer] Monti. "High-power medium-voltage DC-DC converters : design, control and demonstration / Nils Soltau ; Rik W. de Doncker, Antonello Monti". Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1158599544/34.

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Libri sul tema "Medium Voltage DC"

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Chen, Wu, Guangfu Ning, Fang Liu e Defeng Xin. High Power Medium Voltage DC Grid-Connected Converter for Renewable Energy Generation. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-4950-8.

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Grainger, Brandon, e Rik W. De Doncker, a cura di. Medium Voltage DC System Architectures. Institution of Engineering and Technology, 2021. http://dx.doi.org/10.1049/pbpo143e.

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Doncker, Rik W. De, e Brandon Grainger. Medium Voltage DC System Architectures. Institution of Engineering & Technology, 2022.

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Capitoli di libri sul tema "Medium Voltage DC"

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Jiang, Songfang, Jun Liang, Kewen Wang, Jian Chen, Mengru Chen e Jiatong Yu. "Traveling Wave Protection of Medium Voltage DC Distribution Network". In Lecture Notes in Electrical Engineering, 1208–15. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1870-4_127.

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Yunfeng, Jiang, Zhang Zhiping, Bao Hua, Wang Fei, Yang Xi, Jiang Qilong, Wang Aihua e Zhou Chengming. "The Research on Three-phase Medium-frequency DC High-voltage Power". In Electrostatic Precipitation, 354–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89251-9_71.

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Zhong, Jianying, Wenkui Liu, Xiao Li, Longlong Wang, Sumin Pang e Peng Zhao. "Research on the Topology of Medium Voltage DC Hybrid Current Limiter". In The Proceedings of the 9th Frontier Academic Forum of Electrical Engineering, 47–57. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6609-1_5.

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Zhiming, Shi, Jia Ke, Wu Wenqiang, Chen Miao, Chen Cong e Liu Bohan. "Incipient Fault Identification Based Protection for a Medium Voltage DC Integration System". In Lecture Notes in Electrical Engineering, 77–92. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7156-2_6.

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Wang, Beibei. "Research on Current Limiting Protection Method of Short Circuit Faults in Medium Voltage DC Integrated Power Systems". In Lecture Notes in Electrical Engineering, 417–25. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-7413-9_39.

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Kharezy, Mohammad, Morteza Eslamian e Torbjörn Thiringer. "Insulation Design of a Medium Frequency Power Transformer for a Cost-Effective Series High Voltage DC Collection Network of an Offshore Wind Farm". In Lecture Notes in Electrical Engineering, 1406–17. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31680-8_134.

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Beddingfield, Richard B., e Paul R. Ohodnicki Jr. "Medium frequency and medium voltage transformer technology for DC—DC converter applications". In Medium Voltage DC System Architectures, 201–27. Institution of Engineering and Technology, 2021. http://dx.doi.org/10.1049/pbpo143e_ch7.

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Grainger, Brandon, e Zachary Smith. "Modern control and mode visualization of bidirectional DC/DC converters". In Medium Voltage DC System Architectures, 177–200. Institution of Engineering and Technology, 2021. http://dx.doi.org/10.1049/pbpo143e_ch6.

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De Doncker, Rik W., e Jingxin Hu. "Bidirectional isolated DC—DC converters— enabling technology for MVDC networks with distributed generation". In Medium Voltage DC System Architectures, 119–49. Institution of Engineering and Technology, 2021. http://dx.doi.org/10.1049/pbpo143e_ch4.

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Wang, Fei (Fred), Yaosuo Xue e Le Kong. "MVDC stability: modeling, analysis, and enhancement approaches". In Medium Voltage DC System Architectures, 229–60. Institution of Engineering and Technology, 2021. http://dx.doi.org/10.1049/pbpo143e_ch8.

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Atti di convegni sul tema "Medium Voltage DC"

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Zhu, Wenqin, Haitian Wang, Yi Luo, Ruoyu Xu, Bin Du e Mingyu Zhou. "Development of a polypropylene insulation material for medium voltage AC and DC cables". In 2024 IEEE International Conference on High Voltage Engineering and Applications (ICHVE), 1–4. IEEE, 2024. http://dx.doi.org/10.1109/ichve61955.2024.10676279.

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Barati, F., Dan Li e R. A. Dougal. "Voltage regulation in medium voltage DC systems". In 2013 IEEE Electric Ship Technologies Symposium (ESTS 2013). IEEE, 2013. http://dx.doi.org/10.1109/ests.2013.6523763.

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Liu, B., E. K. A. Hussain, L. Liu, A. Fateh e S. Wang. "Isolated medium-voltage DC-DC power converter topologies". In 12th International Conference on Power Electronics, Machines and Drives (PEMD 2023). Institution of Engineering and Technology, 2023. http://dx.doi.org/10.1049/icp.2023.1976.

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Tran, Yan-Kim, e Drazen Dujic. "A multiport medium voltage isolated DC-DC converter". In IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2016. http://dx.doi.org/10.1109/iecon.2016.7793699.

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Liljestrand, Lars, Magnus Backman, Lars Jonsson, Edgar Dullni e Marco Riva. "Medium voltage DC vacuum circuit breaker". In 2015 3rd International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST). IEEE, 2015. http://dx.doi.org/10.1109/icepe-st.2015.7368340.

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Gaudreau, Marcel P. J., Neal Butler e Matthew Munderville. "Undersea medium voltage DC power distribution". In 2017 IEEE Electric Ship Technologies Symposium (ESTS). IEEE, 2017. http://dx.doi.org/10.1109/ests.2017.8069289.

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Adam, G. P., F. Alsokhiry, Y. Al-Turki, M. O. Ajangnay e A. Y. Amogpai. "DC-DC Converters for Medium and High Voltage Applications". In IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2019. http://dx.doi.org/10.1109/iecon.2019.8926872.

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Hoehn, Thomas, Francisco Blanquez, Karsten Kahle, Jean-Paul Burnet e Herwig Renner. "Voltage Dip Mitigation Techniques for Medium-Voltage DC Networks". In 2019 IEEE Third International Conference on DC Microgrids (ICDCM). IEEE, 2019. http://dx.doi.org/10.1109/icdcm45535.2019.9232912.

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Deng, Qiu, e Roger A. Dougal. "Fault Protection in Medium Voltage DC microgrids". In 2017 IEEE Second International Conference on DC Microgrids (ICDCM). IEEE, 2017. http://dx.doi.org/10.1109/icdcm.2017.8001023.

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Heidemann, Matthias, Gregor Nikolic, Armin Schnettler, Ala Qawasmi, Nils Soltau e Rik W. De Donker. "Circuit-breakers for medium-voltage DC grids". In 2016 IEEE PES Transmission & Distribution Conference and Exposition - Latin-America (PES T&D-LA). IEEE, 2016. http://dx.doi.org/10.1109/tdc-la.2016.7914153.

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