A Cuk Based Modular Dc Dc Converter For Medium Voltage Direct Current Mvdc Grid Applications

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A Ćuk-based Modular DC-DC Converter for Medium-voltage Direct-current (MVDC) Grid Applications

Author : Abdulgafor Mohammed Alfares
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (123 download)

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Book Synopsis A Ćuk-based Modular DC-DC Converter for Medium-voltage Direct-current (MVDC) Grid Applications by : Abdulgafor Mohammed Alfares

Download or read book A Ćuk-based Modular DC-DC Converter for Medium-voltage Direct-current (MVDC) Grid Applications written by Abdulgafor Mohammed Alfares and published by . This book was released on 2020 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A reliable modular DC-DC converter that is well-suited to the MVDC grid applications is presented in this dissertation. This converter benefits from zero current turn-off and soft turn-on switching. Each power module is designed and controlled such that it employs two small film capacitors for transferring the power from the input to the output. This feature eliminates the need for electrolytic capacitors that have high failure rates. Furthermore, each power module is configured as an isolated converter, using an integrated high frequency transformer. Each power module in the proposed modular converter sees only one semiconductor on the conduction path to transfer energy from the input to the link capacitors or from the link capacitors to the output, which results in relatively low conduction losses. Another advantage of the proposed converter is the possibility of having bidirectional flow of power. The zero current turn-off feature in the proposed converter allows using any type of active switches, even Silicon Controlled Rectifiers (SCRs), which are naturally commuted switches. SCRs have numerous advantages over the other power switches, including higher voltage ratings and current ratings, lower power losses, lower cost, and higher reliability, which are all of particular importance in the MVDC grid application. The main limitation of SCRs is that they have natural commutation and cannot be turned off with gate signals. The approach employed in this dissertation enables the use of SCRs in the proposed modular DC-DC converters. The input and output terminals of the power modules can be connected in series or in parallel to form modular converters that facilitate sharing voltage or current in high power applications. In this dissertation, an input-parallel output-series (IPOS) modular configuration is considered to increase the voltage blocking capability at the output and handle high currents at the input of the converter. The dissertation studies the principles of the operation of this converter and presents its design procedure. Also, a modified topology for reducing the number of inputs switches is proposed. Multi-port configurations that allow having several independent input sources in this modular DC-DC converter are presented in this dissertation. In addition, a brief comparison between the proposed topology and a dual active bridge (DAB)-based modular converter, which is the most common DC-DC converter topology used in MVDC grid, is carried out. In addition, the performance of the proposed modular converter is evaluated through simulations and experiments"--Author's abstract.

Modular Medium-Voltage DC/DC Converter Based Systems

Author : Ahmed Aboushady
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659591716
Total Pages : 292 pages
Book Rating : 4.5/5 (917 download)

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Book Synopsis Modular Medium-Voltage DC/DC Converter Based Systems by : Ahmed Aboushady

Download or read book Modular Medium-Voltage DC/DC Converter Based Systems written by Ahmed Aboushady and published by LAP Lambert Academic Publishing. This book was released on 2014-08-21 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: A modular approach for connecting dc/dc converters is a technique proposed for constructing high power level converter architectures. The main advantages of a modular approach include, increased fault tolerance introduced by redundant modules, standardization of components leading to reduced manufacturing cost and time, power systems can be easily expanded, and higher power density of the overall system, especially with interleaving. System reliability is potentially improved due to redundancy but this must be traded off against the increased number of power electronic devices. Compared with direct series/parallel connection of power devices, modularity serves better when factors such as converter reconfiguration and power level scaling, as well as interleaving to reduce filter requirements, are considered. The main objective of this work is to design, analyse, model and control modular medium-power medium-voltage dc/dc converter based systems. A typical application considered for this modular approach is feeding subsea electrically actuated oil and gas production systems, from onshore terminals, but the proposed converter can be also applied to other applications.

Modular Multilevel Converters

Author : Sixing Du
Publisher : John Wiley & Sons
ISBN 13 : 1119366305
Total Pages : 360 pages
Book Rating : 4.1/5 (193 download)

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Book Synopsis Modular Multilevel Converters by : Sixing Du

Download or read book Modular Multilevel Converters written by Sixing Du and published by John Wiley & Sons. This book was released on 2018-01-11 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: An invaluable academic reference for the area of high-power converters, covering all the latest developments in the field High-power multilevel converters are well known in industry and academia as one of the preferred choices for efficient power conversion. Over the past decade, several power converters have been developed and commercialized in the form of standard and customized products that power a wide range of industrial applications. Currently, the modular multilevel converter is a fast-growing technology and has received wide acceptance from both industry and academia. Providing adequate technical background for graduate- and undergraduate-level teaching, this book includes a comprehensive analysis of the conventional and advanced modular multilevel converters employed in motor drives, HVDC systems, and power quality improvement. Modular Multilevel Converters: Analysis, Control, and Applications provides an overview of high-power converters, reference frame theory, classical control methods, pulse width modulation schemes, advanced model predictive control methods, modeling of ac drives, advanced drive control schemes, modeling and control of HVDC systems, active and reactive power control, power quality problems, reactive power, harmonics and unbalance compensation, modeling and control of static synchronous compensators (STATCOM) and unified power quality compensators. Furthermore, this book: Explores technical challenges, modeling, and control of various modular multilevel converters in a wide range of applications such as transformer and transformerless motor drives, high voltage direct current transmission systems, and power quality improvement Reflects the latest developments in high-power converters in medium-voltage motor drive systems Offers design guidance with tables, charts graphs, and MATLAB simulations Modular Multilevel Converters: Analysis, Control, and Applications is a valuable reference book for academic researchers, practicing engineers, and other professionals in the field of high power converters. It also serves well as a textbook for graduate-level students.

Modular Multilevel Converters with Multi-frequency Power Transfer

Author : Yuan Li
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (141 download)

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Book Synopsis Modular Multilevel Converters with Multi-frequency Power Transfer by : Yuan Li

Download or read book Modular Multilevel Converters with Multi-frequency Power Transfer written by Yuan Li and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MMC is the dominant voltage-sourced converter technology for HVDC systems including terrestrial power transmission and offshore wind power integration. It is also a state-of-the-art solution for emerging MVDC applications such as bipolar dc distribution and grid integration of renewable energy resources. Significant research has been recently targeting the development of new MMC-based topologies that can reap the benefits of the conventional dc-ac MMC in dc grids and hybrid ac/dc power systems. Notable examples include dc-dc converters, multi-port converters, line power flow controllers and power tapping stations. This thesis introduces the concept of multi-frequency power transfer in MMCs where the magnetics windings are multi-tasked to carry currents with multiple frequency components, namely dc and fundamental frequency. Core dc flux cancellation is imposed by appropriate orientation of the individual windings. This novel power transfer mechanism can eliminate redundant energy conversion through partial-power-processing while offering increased flexibility in converter port power flows. Based on the multi-frequency power transfer concept, new MMC-based topologies are proposed that are well suited for MVDC and HVDC grids and hybrid ac/dc systems. Firstly, a new class of single-stage modular multilevel dc-dc converter, termed the M2DC-CT, is proposed for applications requiring either high or low dc stepping ratios. By placing center-tapped transformer windings in series with the arms in each phase leg, the advantages of minimized ac arm currents and absence of dc voltage stress between windings are simultaneously obtained unlike in prior art. Modeling and analysis gives insight into the M2DC-CT multi-frequency power transfer characteristics and suitable converter controls are developed. Converter operation is validated through simulation and experiment. %The M2DC-CT is further extended into a three-port converter by addition of a grid side transformer winding. Secondly, a dual MMC structure is presented that achieves multi-frequency power transfer by tying together the three mid-points of the converter-side center-tapped transformer windings to form an additional dc port. This creates a bipolar MMC with the ability to balance the dc pole power flows in bipolar dc grids. The employed center-tapped transformer has a Volt-Ampere rating that is the same as a conventional grid interfacing transformer. Dynamic controls formulated in the $\alpha\beta$-frame provide tight regulation of the port power flows while ensuring balanced capacitor voltages. The independent pole balancing capability is confirmed through simulation of detailed MVDC-level and HVDC-level PSCAD models and rigorous experimental testing on a scaled-down laboratory prototype. Thirdly, the aforementioned multi-frequency dual MMC structure is proposed for use as a three-port MMC. It allows simultaneous dc-dc and dc-ac conversions between an ac grid and two dc systems, which is distinctly different from the earlier bipolar dc grid application. The $\alpha\beta$ controls developed earlier are easily extended for the three-port application by assigning appropriate reference signals. Steady-state and dynamic operation of the three-port dual MMC topology is validated by simulation with a HVDC-level PSCAD model and extensive experimental tests. Lastly, a detailed comparative assessment of three-port MMCs for high-power applications is conducted. The proposed three-port dual MMC structure and three-port version of the M2DC-CT are compared against two other existing three-port MMCs, on the basis of efficiency, semiconductor effort, internal energy storage and magnetics. Both MVDC and HVDC case studies are examined including several different power flow cases, with provisions for fault blocking. The results indicate the use of multi-frequency power transfer can enable significant reductions in converter operating losses and cost relative to prior art, depending on the application.

Design, Analysis, and Control of the Modular Multilevel DC/DC Converter for Medium- and High-voltage DC Grids

Author : Ramin Razani
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (141 download)

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Book Synopsis Design, Analysis, and Control of the Modular Multilevel DC/DC Converter for Medium- and High-voltage DC Grids by : Ramin Razani

Download or read book Design, Analysis, and Control of the Modular Multilevel DC/DC Converter for Medium- and High-voltage DC Grids written by Ramin Razani and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays, renewable energy sources have gained escalating importance due to environmental and economic reasons. However, these energy sources are primarily located in remote areas and distant from load centers. High-voltage dc (HVDC) and medium-voltage dc (MVDC) systems have been proposed in the last decades for efficient and reliable integration of renewable energy resources. To date, a noticeable number of these dc systems are established around the world. Recently, researchers have proposed the concept of "DC grids," which can be realized by connecting the existing point-to-point dc systems. This structure can improve the efficiency and stability of the power system. However, one of the most concerning challenges related to this concept is the interconnection of already built dc systems. Because existing dc systems are built through time, they possibly have different voltage levels and grounding systems. To address this challenge, the dc/dc modular multilevel converter (MMC) is proposed in the literature as one of the most promising solutions. This converter offers the advantages of modularity, scalability, and high efficiency. Few studies have been conducted on the modeling and control of the dc/dc MMC. The literature falls short in several aspects, such as improved design, analysis of operation limits, fault-tolerant operation, converter analysis under uncertainty, and development of advanced controllers and efficient fault-blocking capability. This research aims to 1) develop an augmented design approach that considers both control and hardware aspects of the converter, 2) investigate the operation limit of the hybrid dc/dc MMC caused by the capacitors voltages unbalance, 3) develop a tailored fault-tolerant operation strategy without additional submodules (SMs), 4) analyze the unsymmetrical operation of the dc/dc MMC caused by parametric uncertainty, 5) develop an advanced controller based on the model predictive control for the dc/dc MMC, and 6) realize an efficient fault-blocking capability by proper selection of SMs. The first study in this thesis facilitates the dc/dc MMC design with a smaller number of SMs and higher efficiency. Unlike the previous literature, the analytical results of the second study show that the capacitors voltages balance in the hybrid dc/dc MMC limits the operation range of the converter. In the third study, first, the unique features of the dc/dc MMC are investigated. These features make the fault-tolerant operation possible without the need for additional SMs. Then, utilizing these features, a tailored fault-tolerant operation strategy is developed to cope with several SMs failures. When the parametric uncertainty comes into action, it can force the converter to work in unsymmetrical conditions. The fourth study develops steady-state models representing the behavior of the converter in unsymmetrical conditions, and then the maximum tolerable variation of parameters is found in different practical cases. An advanced controller based on the model predictive control is developed in the fifth study to improve the steady-state and transient performances of the dc/dc MMC. Finally, an efficient fault-blocking capability is realized by adequately selecting the number and type of SMs. Detailed time-domain simulations under the MATLAB/Simulink environment validate the analytical results. This research contributed to the fundamental understanding of the dc/dc MMC operation and significantly improved the converter efficiency, reliability, and steady-state and dynamic performances.

Medium-Voltage Direct Current Grid

Author : M. M. Eissa
Publisher : Academic Press
ISBN 13 : 0128145617
Total Pages : 232 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Medium-Voltage Direct Current Grid by : M. M. Eissa

Download or read book Medium-Voltage Direct Current Grid written by M. M. Eissa and published by Academic Press. This book was released on 2019-05-03 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Medium Voltage Direct Current Grid is the first comprehensive reference to provide advanced methods and best practices with case studies to Medium Voltage Direct Current Grid (MVDC) for Resilience Operation, Protection and Control. It also provides technical details to tackle emerging challenges, and discuss knowledge and best practices about Modeling and Operation, Energy management of MVDC grid, MVDC Grid Protection, Power quality management of MVDC grid, Power quality analysis and control methods, AC/DC, DC/DC modular power converter, Renewable energy applications and Energy storage technologies. In addition, includes support to end users to integrate their systems to smart grid. Covers advanced methods and global case studies for reference Provides technical details and best practices for the individual modeling and operation of MVDC systems Includes guidance to tackle emerging challenges and support users in integrating their systems to smart grids

MMC-based Conversion for MVDC Applications

Author : Stefan Milovanovic
Publisher :
ISBN 13 :
Total Pages : 248 pages
Book Rating : 4.:/5 (116 download)

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Book Synopsis MMC-based Conversion for MVDC Applications by : Stefan Milovanovic

Download or read book MMC-based Conversion for MVDC Applications written by Stefan Milovanovic and published by . This book was released on 2020 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mots-clés de l'auteur: medium voltage ; high power conversion ; modular multilevel converter ; quasi two-level converter ; Scott transformer connection ; solid state transformer.

Design, Analysis, and Modelling of Modular Medium-voltage DC/DC Converter Based Systems

Author : Ahmed Adel Aboushady
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (141 download)

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Book Synopsis Design, Analysis, and Modelling of Modular Medium-voltage DC/DC Converter Based Systems by : Ahmed Adel Aboushady

Download or read book Design, Analysis, and Modelling of Modular Medium-voltage DC/DC Converter Based Systems written by Ahmed Adel Aboushady and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 mathematical 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.

Medium Voltage Direct Current (MVDC) Converter for Pebble Bed Modular Reactor (PBMR)

Author : Hendrik De Villiers Pretorius
Publisher :
ISBN 13 :
Total Pages : 300 pages
Book Rating : 4.:/5 (614 download)

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Book Synopsis Medium Voltage Direct Current (MVDC) Converter for Pebble Bed Modular Reactor (PBMR) by : Hendrik De Villiers Pretorius

Download or read book Medium Voltage Direct Current (MVDC) Converter for Pebble Bed Modular Reactor (PBMR) written by Hendrik De Villiers Pretorius and published by . This book was released on 2004 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Non-Isolated DC-DC Converters for Renewable Energy Applications

Author : Frede Blaabjerg
Publisher : CRC Press
ISBN 13 : 1000378861
Total Pages : 205 pages
Book Rating : 4.0/5 (3 download)

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Book Synopsis Non-Isolated DC-DC Converters for Renewable Energy Applications by : Frede Blaabjerg

Download or read book Non-Isolated DC-DC Converters for Renewable Energy Applications written by Frede Blaabjerg and published by CRC Press. This book was released on 2021-04-22 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photovoltaic (PV) energy generation is an excellent example of large-scale electric power generation through various parallel arrangements of small voltage-generating solar cells or modules. However, PV generation systems require power electronic converters system to satisfy the need for real-time applications or to balance the demand for power from electric. Therefore, a DC-DC power converter is a vital constituent in the intermediate conversion stage of PV power. This book presents a comprehensive review of various non-isolated DC-DC power converters. Non-isolated DC-DC converters for renewable energy system (RES) application presented in this book 1st edition through a detailed original investigation, obtained numerical/experimental results, and guided the scope to design new families of converters: DC-DC multistage power converter topologies, Multistage "X-Y converter family", Nx IMBC (Nx Interleaved Multilevel Boost Converter), Cockcroft Walton (CW) Voltage Multiplier-Based Multistage/Multilevel Power Converter (CW-VM-MPC) converter topologies, and Z-source and quasi Z-source. Above solutions are discussed to show how they can achieve the maximum voltage conversion gain ratio by adapting the passive/active component within the circuits. For assessment, we have recommended novel power converters through their functionality and designs, tested and verified by numerical software. Further, the hardware prototype implementation is carried out through a flexible digital processor. Both numerical and experimental results always shown as expected close agreement with primary theoretical hypotheses. This book offers guidelines and recommendation for future development with the DC-DC converters for RES applications based on cost-effective, and reliable solutions.

High Temperature DC-to-DC Converters for Downhole Applications

Author : Andreas König
Publisher :
ISBN 13 : 9783832284893
Total Pages : 154 pages
Book Rating : 4.2/5 (848 download)

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Book Synopsis High Temperature DC-to-DC Converters for Downhole Applications by : Andreas König

Download or read book High Temperature DC-to-DC Converters for Downhole Applications written by Andreas König and published by . This book was released on 2009 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis the thermal management and the electric design of high temperature DC/DC converters for a medium-voltage DC transmission system are analyzed. this transmission system enables an energy transmission from surface to downhole ambients with a relatively high transmission voltage and consequently low current. Downhole, a DC/DC converter system is required to convert the transmission voltage to a lower voltage which is suitable for drives to power pumps. Within the DC/DC converter system, several identical galvanically isolated DC/DC converter modules are connected in series at the input and in parallel at the output. The converter system is assemble within a cylindric housing with a diameter of only a few centimeters. On the outside pumped fluid passes byu which can be used for cooling. Limited space and high ambient temperatures require a sophisticated converter design. The main focus of this work is the thermal design and based on the results of the presented analysis the electrical design of the converter system is carried out. With the help of experiments the theoretical and simulative investigations are verified. Furthermore, a technique is presented to operate the semiconductors of the active part of the this converter at their thermal limit. This is enabled with the help of a junction temperature measurement system which offers a direct access to the inner device temperature during operation."--Provided by publisher.

Advanced DC-DC Power Converters and Switching Converters

Author : Salvatore Musumeci
Publisher : MDPI
ISBN 13 : 303650446X
Total Pages : 188 pages
Book Rating : 4.0/5 (365 download)

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Book Synopsis Advanced DC-DC Power Converters and Switching Converters by : Salvatore Musumeci

Download or read book Advanced DC-DC Power Converters and Switching Converters written by Salvatore Musumeci and published by MDPI. This book was released on 2021-03-30 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays, power electronics is an enabling technology in the energy development scenario. Furthermore, power electronics is strictly linked with several fields of technological growth, such as consumer electronics, IT and communications, electrical networks, utilities, industrial drives and robotics, and transportation and automotive sectors. Moreover, the widespread use of power electronics enables cost savings and minimization of losses in several technology applications required for sustainable economic growth. The topologies of DC–DC power converters and switching converters are under continuous development and deserve special attention to highlight the advantages and disadvantages for use increasingly oriented towards green and sustainable development. DC–DC converter topologies are developed in consideration of higher efficiency, reliable control switching strategies, and fault-tolerant configurations. Several types of switching converter topologies are involved in isolated DC–DC converter and nonisolated DC–DC converter solutions operating in hard-switching and soft-switching conditions. Switching converters have applications in a broad range of areas in both low and high power densities. The articles presented in the Special Issue titled "Advanced DC-DC Power Converters and Switching Converters" consolidate the work on the investigation of the switching converter topology considering the technological advances offered by innovative wide-bandgap devices and performance optimization methods in control strategies used.

High Power Medium Voltage DC Grid-connected Converter for Renewable Energy Generation

Author : Wu Chen
Publisher : Springer
ISBN 13 : 9789819749492
Total Pages : 0 pages
Book Rating : 4.7/5 (494 download)

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Book Synopsis High Power Medium Voltage DC Grid-connected Converter for Renewable Energy Generation by : Wu Chen

Download or read book High Power Medium Voltage DC Grid-connected Converter for Renewable Energy Generation written by Wu Chen and published by Springer. This book was released on 2024-09-09 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book focuses on the topology and modulation of non-isolated and isolated high-power DC/DC converters. Firstly, two non-isolated soft-switching resonant step-up structures are proposed. Secondly, the auxiliary-and-main-currents-diversion idea is introduced to significantly reduce the switching loss of the converter, based on which a series of isolated ZCS resonant converters is proposed. Thirdly, the transformer magnetic flux density of isolated resonant converter is totally studied and an asymmetric pulse frequency modulation is proposed to avoid the transformer saturation problem. Finally, three different types of ±35kV/500kW DC grid-connected converters are successfully demonstrated in Zhangbei Renewable Energy Base of China.

DC-DC Converter Designs for Medium and High Voltage Direct Current Systems

Author : Islam Azmy Gowaid
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (141 download)

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Book Synopsis DC-DC Converter Designs for Medium and High Voltage Direct Current Systems by : Islam Azmy Gowaid

Download or read book DC-DC Converter Designs for Medium and High Voltage Direct Current Systems written by Islam Azmy Gowaid and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Analysis and Design of Multicell DC/DC Converters Using Vectorized Models

Author : Thierry Meynard
Publisher : John Wiley & Sons
ISBN 13 : 1119081335
Total Pages : 163 pages
Book Rating : 4.1/5 (19 download)

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Book Synopsis Analysis and Design of Multicell DC/DC Converters Using Vectorized Models by : Thierry Meynard

Download or read book Analysis and Design of Multicell DC/DC Converters Using Vectorized Models written by Thierry Meynard and published by John Wiley & Sons. This book was released on 2015-02-23 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shows how the concepts of vectorization and design masks can be used to help the designer in comparing different designs and making the right choices. The book addresses series and parallel multicell conversion directly, and the concepts can be generalized to describe other topologies.

DC—DC Converters for Future Renewable Energy Systems

Author : Neeraj Priyadarshi
Publisher : Springer Nature
ISBN 13 : 9811643881
Total Pages : 480 pages
Book Rating : 4.8/5 (116 download)

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Book Synopsis DC—DC Converters for Future Renewable Energy Systems by : Neeraj Priyadarshi

Download or read book DC—DC Converters for Future Renewable Energy Systems written by Neeraj Priyadarshi and published by Springer Nature. This book was released on 2021-09-27 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents the analysis and control of numerous DC-DC converters widely used in several applications such as standalone, grid integration, and motor drives-based renewable energy systems. The book provides extensive simulation and practical analysis of recent and advanced DC-DC power converter topologies. This self-contained book contributes to DC-DC converters design, control techniques, and industrial as well as domestic applications of renewable energy systems. This volume will be useful for undergraduate/postgraduate students, energy planners, designers, system analysis, and system governors.

High-Frequency Isolated Bidirectional Dual Active Bridge DC–DC Converters with Wide Voltage Gain

Author : Deshang Sha
Publisher : Springer
ISBN 13 : 9811302596
Total Pages : 326 pages
Book Rating : 4.8/5 (113 download)

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Book Synopsis High-Frequency Isolated Bidirectional Dual Active Bridge DC–DC Converters with Wide Voltage Gain by : Deshang Sha

Download or read book High-Frequency Isolated Bidirectional Dual Active Bridge DC–DC Converters with Wide Voltage Gain written by Deshang Sha and published by Springer. This book was released on 2018-05-17 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by experts, this book is based on recent research findings in high-frequency isolated bidirectional DC-DC converters with wide voltage range. It presents advanced power control methods and new isolated bidirectional DC-DC topologies to improve the performance of isolated bidirectional converters. Providing valuable insights, advanced methods and practical design guides on the DC-DC conversion that can be considered in applications such as microgrid, bidirectional EV chargers, and solid state transformers, it is a valuable resource for researchers, scientists, and engineers in the field of isolated bidirectional DC-DC converters.