High Power DC-AC and AC-DC Multilevel Converter Based on H-bridge Topology Using Improved Control Strategies PDF Download
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Author: Haider Neamah Hashim Almahmoodi
Publisher:
ISBN:
Category : Electric current converters
Languages : en
Pages : 171
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Book Description
Rising worldwide demand for energy, pressing economic constraints, and substantial environmental concerns have led to the harvesting of clean, renewable energy sources such as solar PV and wind energy. To integrate these new resources into the power grid, power electronic converters play a crucial role and have become indispensable devices. Multilevel converters are considered to be state-of-the-art, efficient solutions for medium- and high-voltage industrial applications, due to the difficulty of connecting traditional two-level converters to high- and medium-voltage grids, since the single power switch cannot stand such high voltage. The standard multilevel converter topologies, such as the neutral point clamped (NPC), flying-capacitor multilevel (FCM), and cascaded H-bridge (CHB), are currently used; however, the need for higher efficiency multilevel topologies that require the lowest number of components These benefits make the proposed. The cascade H-bridge multilevel converter topology has been the preferred solution over other standard multilevel converter topologies because each level has the same structure, with no extra clamping diodes or capacitors. Therefore, this study proposes a CHB converter with a new structure that requires fewer number of the insulated-gate bipolar transistors (IGBTs) for generating AC voltage at the output stage of the converter, using a modified phase shift pulse width modulation (PWM) control system. The reduction in the number of required IGBTs will decrease the converter cost, size, and installation area, while also improving its reliability. These benefits make the proposed topology a good candidate for renewable energy applications, especially for photovoltaic integration. The ability of the proposed inverter to generate the desired output voltage waveform has been validated through a laboratory low-power prototype. A comparative analysis with the other typologies is provided, which supports the capability of the proposed topology for reducing the number of high-frequency IGBTs and isolated DC-link. Since one of the most commonly and extensively used converter topologies in power electronics are rectifiers, a grid-connected, active front-end (AFE) rectifier based on the suggested reduced-switch-count CHB converter family is also proposed. The bidirectional capabilities of the proposed multilevel converter verified through simulation and operation in the inverting and rectifying modes. It was shown that the propose typology is able to inject the commanded active and reactive power into the grid in addition to the abilities to absorb power from the grid. The voltage-oriented control (VOC) method has been implemented on the grid-tied bidirectional multilevel converter, and simulation results verify the benefits of the new typology. The proposed converter, modulated with the selective harmonic elimination method (SHEM), has inherited complexity due to the set of nonlinear equations derived to determine the switching angles for the CHB converter with different modulation indices, voltage levels, and various harmonics selected for elimination. Therefore, a generalized solution to address total harmonic distortion (THD) is also proposed.
Author: Haider Neamah Hashim Almahmoodi
Publisher:
ISBN:
Category : Electric current converters
Languages : en
Pages : 171
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Book Description
Rising worldwide demand for energy, pressing economic constraints, and substantial environmental concerns have led to the harvesting of clean, renewable energy sources such as solar PV and wind energy. To integrate these new resources into the power grid, power electronic converters play a crucial role and have become indispensable devices. Multilevel converters are considered to be state-of-the-art, efficient solutions for medium- and high-voltage industrial applications, due to the difficulty of connecting traditional two-level converters to high- and medium-voltage grids, since the single power switch cannot stand such high voltage. The standard multilevel converter topologies, such as the neutral point clamped (NPC), flying-capacitor multilevel (FCM), and cascaded H-bridge (CHB), are currently used; however, the need for higher efficiency multilevel topologies that require the lowest number of components These benefits make the proposed. The cascade H-bridge multilevel converter topology has been the preferred solution over other standard multilevel converter topologies because each level has the same structure, with no extra clamping diodes or capacitors. Therefore, this study proposes a CHB converter with a new structure that requires fewer number of the insulated-gate bipolar transistors (IGBTs) for generating AC voltage at the output stage of the converter, using a modified phase shift pulse width modulation (PWM) control system. The reduction in the number of required IGBTs will decrease the converter cost, size, and installation area, while also improving its reliability. These benefits make the proposed topology a good candidate for renewable energy applications, especially for photovoltaic integration. The ability of the proposed inverter to generate the desired output voltage waveform has been validated through a laboratory low-power prototype. A comparative analysis with the other typologies is provided, which supports the capability of the proposed topology for reducing the number of high-frequency IGBTs and isolated DC-link. Since one of the most commonly and extensively used converter topologies in power electronics are rectifiers, a grid-connected, active front-end (AFE) rectifier based on the suggested reduced-switch-count CHB converter family is also proposed. The bidirectional capabilities of the proposed multilevel converter verified through simulation and operation in the inverting and rectifying modes. It was shown that the propose typology is able to inject the commanded active and reactive power into the grid in addition to the abilities to absorb power from the grid. The voltage-oriented control (VOC) method has been implemented on the grid-tied bidirectional multilevel converter, and simulation results verify the benefits of the new typology. The proposed converter, modulated with the selective harmonic elimination method (SHEM), has inherited complexity due to the set of nonlinear equations derived to determine the switching angles for the CHB converter with different modulation indices, voltage levels, and various harmonics selected for elimination. Therefore, a generalized solution to address total harmonic distortion (THD) is also proposed.
Author: Gabriele Grandi
Publisher: MDPI
ISBN: 3039214810
Category : Technology & Engineering
Languages : en
Pages : 548
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Book Description
This book is a collection of scientific papers concerning multilevel inverters examined from different points of view. Many applications are considered, such as renewable energy interface, power conditioning systems, electric drives, and chargers for electric vehicles. Different topologies have been examined in both new configurations and well-established structures, introducing novel and particular modulation strategies, and examining the effect of modulation techniques on voltage and current harmonics and the total harmonic distortion.
Author: Salman Ahmad
Publisher: John Wiley & Sons
ISBN: 139416632X
Category : Technology & Engineering
Languages : en
Pages : 405
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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: Sanjeet Kumar Dwivedi
Publisher: Academic Press
ISBN: 0128145692
Category : Technology & Engineering
Languages : en
Pages : 290
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Book Description
Modeling and Control of Power Electronics Converter Systems for Power Quality Improvements provides grounded theory for the modeling, analysis and control of different converter topologies that improve the power quality of mains. Intended for researchers and practitioners working in the field, topics include modeling equations and the state of research to improve power quality converters. By presenting control methods for different converter topologies and aspects related to multi-level inverters and specific analysis related to the AC interface of drives, the book helps users by putting a particular emphasis on different control algorithms that enhance knowledge and research work. Present In-depth coverage of modeling and control methods for different converter topology Includes a particular emphasis on different control algorithms to give readers an easier understanding Provides a results and discussion chapter and MATLAB simulation to support worked examples and real-life application scenarios
Author: Sixing Du
Publisher: John Wiley & Sons
ISBN: 1119367239
Category : Science
Languages : en
Pages : 386
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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: Salman Ahmad
Publisher: John Wiley & Sons
ISBN: 1394167350
Category : Technology & Engineering
Languages : en
Pages : 390
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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: Fei Zhang
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
"A high-voltage direct current (HVDC) system is more efficient at transmitting power over long distances than a high-voltage alternating current (HVAC) system. With the increase in renewable energy integration, HVDC technology is more important for the efficient integration of distributed energy sources (DERs) into grids. The features of a modular multilevel converter (MMC) make it the topology of choice for high-power applications for HVDC systems. To interconnect DC networks with different voltage levels, a DC-DC converter is a crucial component that plays the role of the AC transformer in the AC system. This thesis focuses on the topology of a transformer-less MMC DC-DC converter for HVDC grid applications and its control strategy. The main objective of the thesis is to develop a fully switch-based MMC DC-DC topology without using a transformer or passive filters. The proposed topologies have a hybrid combination of half-bridge submodules (HBSMs) and full-bridge submodules (FBSMs). Moreover, by taking advantage of both HBSMs and FBSMs, the proposed MMC DC-DC converter has the DC fault ride-through capability, which is necessary in DC systems. A family of transformer-less hybrid MMC DC-DC converters with T-type connections is investigated. The optimal selection rules of the submodule (SM) type, based on switch utilization and DC fault blocking capability, are evaluated under different voltage conversion ratios. A modified topology is also investigated to reduce the circulating current that balances the energy between the arms, which has delta-connected FBSMs to simultaneously maintain the unity power operation of the arms with HBSMs and the DC fault ride-through capability. In addition to the topology of an MMC DC-DC converter, a control strategy based on the model predictive control (MPC) of the MMC is presented. A voltage-level based MPC is proposed to address the issue of the large computational burden of conventional MPC used in MMC applications. Instead of directly selecting the switching states, the proposed predictive control has a hierarchical structure that first selects the optimal voltage level by assuming that the capacitor voltage of all SMs is balanced and then balances the capacitor voltages by using a separate control loop. The proposed predictive control is applied to the MMC DC-DC converter to guarantee the converter's fast response during transient operation.The performance of the proposed topology and control strategy is validated using both real-time simulation and a lab-scale, experimental test bench." --
Author: Biplab Das
Publisher: Springer Nature
ISBN: 9811598290
Category : Technology & Engineering
Languages : en
Pages : 802
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Book Description
This book includes selected peer-reviewed papers presented at the International Conference on Modeling, Simulation and Optimization, organized by National Institute of Technology, Silchar, Assam, India, during 3–5 August 2020. The book covers topics of modeling, simulation and optimization, including computational modeling and simulation, system modeling and simulation, device/VLSI modeling and simulation, control theory and applications, modeling and simulation of energy system and optimization. The book disseminates various models of diverse systems and includes solutions of emerging challenges of diverse scientific fields.
Author: Lingfeng Wang
Publisher: Springer Science & Business Media
ISBN: 3642229042
Category : Technology & Engineering
Languages : en
Pages : 369
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Book Description
The concept of the smart grid promises the world an efficient and intelligent approach of managing energy production, transportation, and consumption by incorporating intelligence, efficiency, and optimality into the power grid. Both energy providers and consumers can take advantage of the convenience, reliability, and energy savings achieved by real-time and intelligent energy management. To this end, the current power grid is experiencing drastic changes and upgrades. For instance, more significant green energy resources such as wind power and solar power are being integrated into the power grid, and higher energy storage capacity is being installed in order to mitigate the intermittency issues brought about by the variable energy resources. At the same time, novel power electronics technologies and operating strategies are being invented and adopted. For instance, Flexible AC transmission systems and phasor measurement units are two promising technologies for improving the power system reliability and power quality. Demand side management will enable the customers to manage the power loads in an active fashion. As a result, modeling and control of modern power grids pose great challenges due to the adoption of new smart grid technologies. In this book, chapters regarding representative applications of smart grid technologies written by world-renowned experts are included, which explain in detail various innovative modeling and control methods.
Author: Bo Zhang
Publisher: John Wiley & Sons
ISBN: 1119188369
Category : Science
Languages : en
Pages : 304
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Book Description
An all-in-one guide to high-voltage, multi-terminal converters, this book brings together the state of the art and cutting-edge techniques in the various stages of designing and constructing a high-voltage converter. The book includes 9 chapters, and can be classified into three aspects. First, all existing high-voltage converters are introduced, including the conventional two-level converter, and the multi-level converters, such as the modular multi-level converter (MMC). Second, different kinds of multi-terminal high-voltage converters are presented in detail, including the topology, operation principle, control scheme and simulation verification. Third, some common issues of the proposed multi-terminal high-voltage converters are discussed, and different industrial applications of the proposed multi-terminal high-voltage converters are provided. Systematically proposes, for the first time, the design methodology for high-voltage converters in use of MTDC grids; also applicable to constructing novel power electronics converters, and driving the development of HVDC, which is one of the most important technology areas Presents the latest research on multi-terminal high-voltage converters and its application in MTDC transmission systems and other industrially important applications Offers an overview of existing technology and future trends of the high-voltage converter, with extensive discussion and analysis of different types of high-voltage converters and relevant control techniques (including DC-AC, AC-DC, DC-DC, and AC-AC converters) Provides readers with sufficient context to delve into the more specialized topics covered in the book Featuring a series of novel multi-terminal high-voltage converters proposed and patented by the authors, Multi-terminal High Voltage Converters is written for researchers, engineers, and advanced students specializing in power electronics, power system engineering and electrical engineering.
