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Author: Aleksandr Viatkin Publisher: Springer Nature ISBN: 3031247124 Category : Technology & Engineering Languages : en Pages : 158
Book Description
This book reports on a comprehensive study on a novel high-power converter, i.e. a Modular Multilevel Converter with Interleaved Half-bridge Submodules (ISM-MMC). It describes in depth its average model, the operating principles, as well as a new control method and a hybrid modulation strategy that help to exploit the benefits of the interleaving scheme. The new power converter is particularly advantageous for high-current applications that require superb quality of input/output waveforms. Moreover, this book reports on a systematic study of the current balancing problem between parallel-connected units that commutate in non-simultaneous fashion. This is a typical issue in interleaved converters, however here it is analyzed for the first time in relation to MMC-based structures. Two control strategies are proposed to cope with this matter. By using a sensorless regulation scheme, the number of required current transducers has been minimized, reducing complexity, cost, and footprint of the hardware, while providing converter with a fast and accurate current balancing. This book also offers a comprehensive comparison between several practical designs of ISM-MMC and classical MMC for an ultra-fast electrical vehicle charger. All in all, it provides graduate students and researchers, as well as field engineers and professionals with extensive information and essential practical details on the state-of-the-art MMC and ISM-MMC design.
Author: Aleksandr Viatkin Publisher: Springer Nature ISBN: 3031247124 Category : Technology & Engineering Languages : en Pages : 158
Book Description
This book reports on a comprehensive study on a novel high-power converter, i.e. a Modular Multilevel Converter with Interleaved Half-bridge Submodules (ISM-MMC). It describes in depth its average model, the operating principles, as well as a new control method and a hybrid modulation strategy that help to exploit the benefits of the interleaving scheme. The new power converter is particularly advantageous for high-current applications that require superb quality of input/output waveforms. Moreover, this book reports on a systematic study of the current balancing problem between parallel-connected units that commutate in non-simultaneous fashion. This is a typical issue in interleaved converters, however here it is analyzed for the first time in relation to MMC-based structures. Two control strategies are proposed to cope with this matter. By using a sensorless regulation scheme, the number of required current transducers has been minimized, reducing complexity, cost, and footprint of the hardware, while providing converter with a fast and accurate current balancing. This book also offers a comprehensive comparison between several practical designs of ISM-MMC and classical MMC for an ultra-fast electrical vehicle charger. All in all, it provides graduate students and researchers, as well as field engineers and professionals with extensive information and essential practical details on the state-of-the-art MMC and ISM-MMC design.
Author: Sixing Du Publisher: John Wiley & Sons ISBN: 1119367239 Category : Science Languages : en Pages : 386
Book Description
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.
Author: Mojtaba Ashourloo Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This work presents an equivalent model and simulation architecture for real-time electromagnetic transient analysis of either half-bridge or full-bridge modular multilevel converter (MMC) with 400 sub-modules (SMs) per arm. The proposed CPU/FPGA-based architecture is optimized for the parallel implementation of the presented MMC model on the FPGA and is beneficiary of a high-throughput floating-point computational engine. The developed real-time simulation architecture is capable of simulating MMCs with 400 SMs per arm at 825 nanoseconds. To address the difficulties of the sorting process implementation, a modified Odd-Even Bubble sorting is presented in this work. The comparison of the results under various test scenarios reveals that the proposed real-time simulator is representing the system responses in the same way of its corresponding off-line counterpart obtained from the PSCAD/EMTDC program.
Author: Salman Ahmad Publisher: John Wiley & Sons ISBN: 139416632X Category : Technology & Engineering Languages : en Pages : 405
Book Description
Discover the deep insights into the operation, modulation, and control strategies of multilevel converters, alongside their recent applications in variable speed drives, renewable energy generation, and power systems. Multilevel converters have gained attention in recent years for medium/high voltage and high power industrial and residential applications. The main advantages of multilevel converters over two level converters include less voltage stress on power semiconductors, low dv/dt, low common voltage, reduced electromagnetic interference, and low total harmonics distortion, among others. Better output power quality is ensured by increasing the number of levels in the synthesized output voltage waveform. Several multilevel topologies have been reported in the literature, such as neutral point clamped (NPC), flying capacitor (FC), cascaded H-bridge (CHB), hybrid cascaded H-bridge, asymmetrical cascaded H-bridge, modular multilevel converters (MMC), active neutral point clamped converters (ANPC), and packed U-cell type converters and various reduced device counts and a reduced number of source-based topologies have been proposed in literature. The multilevel converter, although a proven and enabling technology, still presents numerous challenges in topologies, modulation, and control, as well as in need-based applications. Since multilevel converters offer a wide range of possibilities, research and development in the areas of multilevel converter topologies, modulation, and control in various applications are still growing. To further improve multilevel converter energy efficiency, reliability, power density, and cost, many research groups across the world are working to broaden the application areas of multilevel converters and make them more attractive and competitive compared to classic topologies. Multilevel Converters intends to provide deep insight about multilevel converter operation, modulation, and control strategies and various recent applications of multilevel converters such as in variable speed drives, renewable energy generation, and power systems.
Author: Fujin Deng Publisher: John Wiley & Sons ISBN: 1119875625 Category : Technology & Engineering Languages : en Pages : 372
Book Description
Modular Multilevel Converters Expert discussions of cutting-edge methods used in MMC control, protection, and fault detection In Modular Multilevel Converters: Control, Fault Detection, and Protection, a team of distinguished researchers delivers a comprehensive discussion of fault detection, protection, and tolerant control of modular multilevel converters (MMCs) under internal and external faults. Beginning with a description of the configuration of MMCs, their operation principles, modulation schemes, mathematical models, and component design, the authors go on to explore output control, fault detection, capacitor monitoring, and other topics of central importance in the field. The book offers summaries of centralized capacitor voltage-balancing control methods and presents several capacitor monitoring methods, like the direct and sorting-based techniques. It also describes full-bridge and half-bridge submodule-based hybrid MMC protection methods and alternative fault blocking SM-based MMCs. Readers will also find: A thorough introduction to modular multilevel converters, including circuits, operation principles, modulation, mathematical models, components, and design constraints In-depth discussions of the control of modular multilevel converters, including output control, centralized capacitor voltage control, and individual capacitor voltage control Comprehensive explorations of fault detection of MMCs under IGBT faults, including short-circuit and open-circuit faults, as well as fault-tolerant control of MMCs Fulsome treatments of the control of MMCs under AC grid faults, including discussions of AC-side current control Perfect for electrical engineering researchers, Modular Multilevel Converters: Control, Fault Detection, and Protection, will also earn a place in the libraries of electrical engineers working in industry, as well as undergraduate and graduate students with an interest in MMCs.
Author: Younes Sangsefidi Publisher: ISBN: Category : Electric current converters Languages : en Pages : 93
Book Description
A modular multilevel converter (MMC) has a modular design and features low harmonic distortion and switching frequency. An MMC can be switched using staircase modulation method (which has a low switching frequency) or the common pulse-width modulation PWM method (which has a better harmonic performance). There are two main types of MMCs: 1) MMC with half-bridge submodules, which has an output voltage with a peak-to-peak magnitude limited to its DC link voltage and 2) MMC with full-bridge submodules, which has voltage boosting (step-up) capability. This work proposes a step-up MMC with reduced number of switches in its submodules (reduced-switch submodule: RSSM) for energy harvesting from low-voltage resources. This work first proposes the following methods and strategies for this MMC-RSSM with staircase modulation for an arbitrary number of submodules: 1) an analytical method to study different operating modes of MMC-RSSM, 2) a generalized switching strategy to synthesize the output AC voltage and regulate the voltages of capacitors in all operating modes, and 3) an algorithm to improve the transient response of the MMC during start-up or transition between operating modes. For applications with bidirectional power transfer, the RSSMs should be replaced by full-bridge submodules to allow both positive and negative arm currents. In this work, the proposed switching strategy (which focuses on energy harvesting systems with a unidirectional power transfer) is then extended to bidirectional MMC-FBSMs. This work also proposes a low-switching frequency PWM-based switching strategy for the MMC-RSSM. This PWM-based switching strategy provides a continuous control over capacitor voltages and a higher voltage boost without a significant increase in switching frequency. Simulation and experimental results validate the proposed topology, analysis, and switching strategy.
Author: Cesar Gabiel Marzoa Montalvo Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
In operating Modular Multilevel Converters (MMCs) the common practice is to eliminate circulating currents using a Circulating Current Suppression Controller (CCSC). This practice reduces converter losses and submodule capacitor voltage ripple; it also allows usage of semiconductors with lower ratings. Although preliminary research has pointed to the possibility of minimizing capacitor voltage ripple or converter losses by injecting circulating currents, little formal analysis has been conducted on how the improvement of one will affect the other, or on how to control the ripple or the losses. This thesis presents a detailed analysis on how to inject a precise amount of circulating currents in order to obtain certain submodule capacitor ripple. A mathematical model that describes the capacitor voltage ripple based on the second-order circulating current contents is used to determine the ripple profile of the converter at a given operating point. Then it is possible to determine what amount of circulating current needs to be injected to obtain a certain ripple. An analysis of how such circulating current injection affects losses is also made. The proposed method is validated using PSCAD/EMTDC simulations, where a high level of accuracy is observed. Validation using a Real-Time Digital Simulator (RTDS) using a Control Hardware-in-Loop (CHIL) scheme is also presented. An implementation in a down-scaled MMC prototype further validates the proposed method. This thesis shows that the optimal operating point (regarding losses and capacitor voltage ripple) for MMCs is not achieved by using a conventional CCSC, as is the common practice today; instead injecting a certain amount of second-order circulating current can reduce both ripple and converter losses simultaneously.
Author: Mario Marchesoni Publisher: MDPI ISBN: 3039363905 Category : Technology & Engineering Languages : en Pages : 248
Book Description
Today, there is a great deal of attention focused on sustainable growth worldwide. The increase in efficiency in the use of energy may even, in this historical moment, bring greater benefit than the use of renewable energies. Electricity appears to be the most sustainable of energies and the most promising hope for a planet capable of growing without compromising its own health and that of its inhabitants. Power electronics and electrical drives are the key technologies that will allow energy savings through the reduction of energy losses in many applications. This Special Issue has collected several scientific contributions related to energy efficiency in electrical equipment. Some articles are dedicated to the use and optimization of permanent magnet motors, which allow obtaining the highest level of efficiency. Most of the contributions describe the energy improvements that can be achieved with power electronics and the use of suitable control techniques. Last but not least, some articles describe interesting solutions for hybrid vehicles, which were created mainly to save energy in the smartest way possible.
Author: Ali Iftekhar Maswood Publisher: John Wiley & Sons ISBN: 1119475864 Category : Technology & Engineering Languages : en Pages : 496
Book Description
A comprehensive survey of advanced multilevel converter design, control, operation and grid-connected applications Advanced Multilevel Converters and Applications in Grid Integration presents a comprehensive review of the core principles of advanced multilevel converters, which require fewer components and provide higher power conversion efficiency and output power quality. The authors – noted experts in the field – explain in detail the operation principles and control strategies and present the mathematical expressions and design procedures of their components. The text examines the advantages and disadvantages compared to the classical multilevel and two level power converters. The authors also include examples of the industrial applications of the advanced multilevel converters and offer thoughtful explanations on their control strategies. Advanced Multilevel Converters and Applications in Grid Integration provides a clear understanding of the gap difference between research conducted and the current industrial needs. This important guide: Puts the focus on the new challenges and topics in related areas such as modulation methods, harmonic analysis, voltage balancing and balanced current injection Makes a strong link between the fundamental concepts of power converters and advances multilevel converter topologies and examines their control strategies, together with practical engineering considerations Provides a valid reference for further developments in the multilevel converters design issue Contains simulations files for further study Written for university students in electrical engineering, researchers in areas of multilevel converters, high-power converters and engineers and operators in power industry, Advanced Multilevel Converters and Applications in Grid Integration offers a comprehensive review of the core principles of advanced multilevel converters, with contributions from noted experts in the field.
Author: Aleksandr Viatkin
Author: Aleksandr Viatkin
Author: Sixing Du
Author: Mojtaba Ashourloo
Author: Salman Ahmad
Author: Fujin Deng
Author: Younes Sangsefidi
Author: Cesar Gabiel Marzoa Montalvo
Author: Mario Marchesoni
Author: Ali Iftekhar Maswood
Author: Chao Chen