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Author: Nagasri Kollipara
Publisher:
ISBN:
Category : Electric network topology
Languages : en
Pages : 71
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Book Description
LLC resonant converters are popular among resonant topologies due to their high efficiency and ability to achieve ZVS and ZCS for wide input range. LLC resonant converters are controlled by frequency modulation (FM), which makes converter difficult to optimize the system in terms of achieving efficient power conversion. FM technique also generate wide range of harmonics which leads to a wide sweep in operating frequency, which can run into regulatory EMI test limits and cause electromagnetic compatibility issues. The performance of LLC topology extends to their poor efficiency at lighter loads, due to constant high magnetization current. In order to increase maximum power efficiency conversion, there is a necessity maintaining fixed frequency which indeed generates high EMI issues at heavy loads. These limitations can be dramatically improved by Phase Shift Modulation (PSM) technique which is investigated in this thesis. PSM controlled technique is expected to not only improve the power supply efficiency at lighter loads. In this thesis, characteristics of LLC converter using phase control is analyzed systematically and compared with conventional frequency modulation technique. Using SIMPLIS simulations, PSM and FM techniques are compared and efficiencies are recorded. At higher loads, both FM and PSM controlled techniques exhibit maximum efficiency of 94.86%. The maximum efficiency of PSM LLC converter is observed at 97.47%. At lighter load conditions, efficiency of PSM LLC converter is observed as 91.66% and FM LLC converter as 82.8%. From simulation results, PSM technique has more controlled resonant tank currents with controlled conduction losses than conventional FM driven converter.
Author: Nagasri Kollipara
Publisher:
ISBN:
Category : Electric network topology
Languages : en
Pages : 71
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Book Description
LLC resonant converters are popular among resonant topologies due to their high efficiency and ability to achieve ZVS and ZCS for wide input range. LLC resonant converters are controlled by frequency modulation (FM), which makes converter difficult to optimize the system in terms of achieving efficient power conversion. FM technique also generate wide range of harmonics which leads to a wide sweep in operating frequency, which can run into regulatory EMI test limits and cause electromagnetic compatibility issues. The performance of LLC topology extends to their poor efficiency at lighter loads, due to constant high magnetization current. In order to increase maximum power efficiency conversion, there is a necessity maintaining fixed frequency which indeed generates high EMI issues at heavy loads. These limitations can be dramatically improved by Phase Shift Modulation (PSM) technique which is investigated in this thesis. PSM controlled technique is expected to not only improve the power supply efficiency at lighter loads. In this thesis, characteristics of LLC converter using phase control is analyzed systematically and compared with conventional frequency modulation technique. Using SIMPLIS simulations, PSM and FM techniques are compared and efficiencies are recorded. At higher loads, both FM and PSM controlled techniques exhibit maximum efficiency of 94.86%. The maximum efficiency of PSM LLC converter is observed at 97.47%. At lighter load conditions, efficiency of PSM LLC converter is observed as 91.66% and FM LLC converter as 82.8%. From simulation results, PSM technique has more controlled resonant tank currents with controlled conduction losses than conventional FM driven converter.
Author: Frede Blaabjerg
Publisher: Academic Press
ISBN: 012816168X
Category : Technology & Engineering
Languages : en
Pages : 570
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Book Description
Control of Power Electronic Converters, Volume Two gives the theory behind power electronic converter control and discusses the operation, modelling and control of basic converters. The main components of power electronics systems that produce a desired effect (energy conversion, robot motion, etc.) by controlling system variables (voltages and currents) are thoroughly covered. Both small (mobile phones, computer power supplies) and very large systems (trains, wind turbines, high voltage power lines) and their power ranges, from the Watt to the Gigawatt, are presented and explored. Users will find a focused resource on how to apply innovative control techniques for power converters and drives. Discusses different applications and their control Explains the most important controller design methods, both in analog and digital Describes different, but important, applications that can be used in future industrial products Covers voltage source converters in significant detail Demonstrates applications across a much broader context
Author: Claudio Adragna
Publisher:
ISBN: 9781638280668
Category :
Languages : en
Pages : 0
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Book Description
A resonant converter is a type of electric power converter that contains a network of inductors and capacitors called a "resonant tank", tuned to resonate at a specific frequency. They find applications in electronics and integrated circuits. The LLC resonant converter is perhaps today's most popular resonant conversion topology. Though in existence for many years, only relatively recently has the LLC resonant converter gained in popularity. Since its first appearance in the literature in 1988, for a long time it was confined to niche applications such as high-voltage power supplies or high-end audio systems. Its significant industrial usage started in mid 2000s with the boom of flat screen TVs, whose power supply requirements found in the LLC resonant converter their best answer, and was fueled by the introduction of new regulations, both voluntary and mandatory, concerning an efficient use of energy. This combination of events pushed power designers to find more and more efficient AC-DC conversion systems. Since then, several other mass-produced electronic devices, such as All-In-One and small form factor PCs, high-power AC-DC adapters and LED drivers, have made a massive usage of this topology, especially in its half-bridge version. Higher power systems, such as server and telecom power supplies and, more recently, charging stations for electric vehicles, have adopted mainly the full-bridge version. Much progress has been made on both the theoretical and practical aspects related to the LLC resonant converter. Numerous publications and application notes deal with it, and many IC manufacturers have dedicated driver ICs in their portfolio. Despite that, its design is still considered a challenging task in Power Conversion. Thus, a guided tour through its intricacies may be beneficial to both the neophyte and the experienced engineer, as well as students active in this field. This monograph covers the basics (operating modes, soft switching mechanism, first-harmonic approximation, etc.) and advanced topics (design optimization, control methods, synchronous rectification, interleaving, etc.) of power conversion using the LLC resonant converter, using a hands-on, design-oriented approach.
Author: Heiko Figge
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
In order to feed IT infrastructure out of the national power grids, the electricity needs to be converted by power supplies. The LLC resonant converter analyzed in this thesis potentially enables a distinct reduction of invest and operational costs based on its superior power density and conversion efficiency. The main obstacles for the adoption of the LLC resonant converter within industrial power supplies are the more disadvantageous control of the power transfer compared to its pulse-width controlled counterparts and the more complex design. This thesis outlines the modeling methods for resonant converters and proposes the extension of the time domain analysis model by a lumped resistive circuit element. The dynamic modeling of the LLC resonant converter is performed utilizing the extended describing functions method, thereby discussing the large variations of the plant characteristic in the dependence on the control variable switching frequency. In addition the problematic short-circuit behavior of the LLC resonant converter is analyzed and a circuit extension proposed. Furthermore this thesis states fundamental design trade-offs within the LLC converter design for industrial power supplies and proposes the usage of numerical optimization with respect to an optimal converter design. Based on the substantial loss contributors, the numerical optimization yields a peak efficiency of 99.2%. As a further aspect the synchronized paralleling of two LLC resonant converters is especially beneficial in case of low output voltages and resulting high output currents. The problematic issue of power imbalance between both converters caused by slightly unequal resonant circuit element values is analyzed in this thesis utilizing the time domain modeling approach. ; eng
Author: Hao Tian
Publisher: Frontiers Media SA
ISBN: 2832540996
Category : Technology & Engineering
Languages : en
Pages : 114
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Book Description
Author: Frede Blaabjerg
Publisher: Academic Press
ISBN: 0128194332
Category : Technology & Engineering
Languages : en
Pages : 718
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Book Description
Control of Power Electronic Converters and Systems, Volume 3, explores emerging topics in the control of power electronics and converters, including the theory behind control, and the practical operation, modeling, and control of basic power system models. This book introduces the most important controller design methods, including both analog and digital procedures. This reference explains the dynamic characterization of terminal behavior for converters, as well as preserving the stability and power quality of modern power systems. Useful for engineers in emerging applications of power electronic converters and those combining control design methods into different applications in power electronics technology. Addressing controller interactions - in light of increasing renewable energy integration and related challenges with stability and power quality - is becoming more frequent in power converters and passive components. Discusses different applications and their control in integrated renewable energy systems Introduces the most important controller design methods, both in analog and digital Describes different important applications to be used in future industrial products Explains the dynamic characterization of terminal behavior for converters
Author: Jaydeep Saha
Publisher: Springer Nature
ISBN: 9811949026
Category : Technology & Engineering
Languages : en
Pages : 295
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Book Description
This book presents novel contributions in the development of solid-state-transformer (SST) technology both for medium-voltage (MV) and low-voltage (LV) utility grid interfaces, which can potentially augment the grid modernization process in the evolving power system paradigm. For the MV interface, a single-stage AC-DC SST submodule topology has been proposed, and its modulation and soft-switching possibilities are analysed, experimentally validated and adequately benchmarked. A control scheme with power balance capability among submodules is developed for MV grid-connected single-stage AC-DC SST for smooth operation under inevitable parameter drift scenario, and experimental validation shows excellent performance under drastic load change conditions. A novel machine learning-aided multi-objective design optimization framework for grid-connected SST is developed and experimentally validated, which equips a power electronics design engineer with meagre computational resources to find out the most optimal SST design in a convenient time-frame. This book has also contributed towards the development of dual-active-bridge (DAB)-type and non-DAB-type LV grid-interfaced isolated AC-DC converters by providing solutions to specific topology and modulation-related shortcomings in these two types of topologies. A comprehensive comparison of the DAB and non-DAB-type LVAC-LVDC converters reveals the superiority of DAB-type conversion strategy.
Author: Tobias Geyer
Publisher: John Wiley & Sons
ISBN: 111901090X
Category : Technology & Engineering
Languages : en
Pages : 581
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Book Description
In this original book on model predictive control (MPC) for power electronics, the focus is put on high-power applications with multilevel converters operating at switching frequencies well below 1 kHz, such as medium-voltage drives and modular multi-level converters. Consisting of two main parts, the first offers a detailed review of three-phase power electronics, electrical machines, carrier-based pulse width modulation, optimized pulse patterns, state-of-the art converter control methods and the principle of MPC. The second part is an in-depth treatment of MPC methods that fully exploit the performance potential of high-power converters. These control methods combine the fast control responses of deadbeat control with the optimal steady-state performance of optimized pulse patterns by resolving the antagonism between the two. MPC is expected to evolve into the control method of choice for power electronic systems operating at low pulse numbers with multiple coupled variables and tight operating constraints it. Model Predictive Control of High Power Converters and Industrial Drives will enable to reader to learn how to increase the power capability of the converter, lower the current distortions, reduce the filter size, achieve very fast transient responses and ensure the reliable operation within safe operating area constraints. Targeted at power electronic practitioners working on control-related aspects as well as control engineers, the material is intuitively accessible, and the mathematical formulations are augmented by illustrations, simple examples and a book companion website featuring animations. Readers benefit from a concise and comprehensive treatment of MPC for industrial power electronics, enabling them to understand, implement and advance the field of high-performance MPC schemes.
Author: Feng Gao
Publisher: Springer Nature
ISBN: 9811674469
Category : Technology & Engineering
Languages : en
Pages : 222
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Book Description
This book investigates the control and optimization of grid-tied power converters, with a special attention attached to pulse width modulation, which determines the size and cost of power converters as well as switching harmonics. Through the methods introduced in this book, multiple grid-tied power converters safely operate and coordinate in a highly efficient and reliable fashion, thereby boosting the operation of modern power grids. To facilitate understanding, the key methods are presented together with their associated algorithms and detailed software codes. In parallel to theoretical treatments, this book further applies the methods into practical scenarios and industrial products, thus enhancing their credibility. The book serves as a guidance for electrical engineers and researchers in the field of power electronics and power systems.
Author: Frede Blaabjerg
Publisher: Academic Press
ISBN: 0323856233
Category : Technology & Engineering
Languages : en
Pages : 642
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Book Description
Control of Power Electronic Converters and Systems, Volume Four covers emerging topics in the control of power electronics and converters not covered in previous volumes, including emerging power converter topologies, storage systems, battery chargers and the smart transformer. This updated edition specifically focuses on emerging power converter topologies and discusses very recent advances and topics with applications in power electronics and formidable probable dynamics. Chapters include modeling of power converters and their control, with supportive simulations and additional experimental results.Anyone looking for fundamental knowledge regarding new trends in power electronics by application, and also ready to use models and methodologies in their design, control and testing will find this the next invaluable resource in this highly regarded series. Combines essential control design methods and trends with different applications of power convertor topologies Includes global perspectives, case studies and real examples from different applications and their control Features ready-to-use models and methodologies in power electronic application, their design, control and testing
