Modulation and Dynamic Control of Intelligent Dual-active-bridge Converter Based Substations for Flexible Dc Grids PDF Download
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Author: Jingxin Hu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Jingxin Hu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Deshang Sha
Publisher: Springer
ISBN: 9811302596
Category : Technology & Engineering
Languages : en
Pages : 326
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Book Description
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.
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: Nie Hou
Publisher:
ISBN:
Category : DC-to-DC converters
Languages : en
Pages : 0
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Book Description
With the development of renewable energies, such as wind energy and solar energy, the dc power system becomes a promising candidate to manage and transfer the re-newable energy source, which stimulates the study of the dc-dc converters in the past decades. Among various dc-dc converters, the dual-active-bridge (DAB) dc-dc con-verter is regarded as one of the most promising candidates for the dc power conver-sion due to merits like isolated, high-efficiency, bidirectional, and ultrafast dynamic characteristics. Except the DAB dc-dc converter, there are some other isolated dc-dc converters such as full bridge dc-dc converter, three-phase DAB dc-dc converter, etc. They normally have similar dynamic characteristics as the DAB dc-dc converter featuring intermediary inductive ac-link (I2ACL) configuration. However, they are rarely investigated in existing literature, especially for better dynamic control performance. To fill such a gap, the dynamic equivalence between the DAB dc-dc converter and other I2ACL isolated dc-dc converters is revealed with the thorough overview of the existing I2ACL topologies in this work. Further, a unified fast-dynamic direct-current control scheme is proposed for significantly improving the dynamic performance of these I2ACL isolated dc-dc converters. With this predetermined analysis, the dynamic control schemes for the DAB-based dc-dc converter systems can be easily extended to other I2ACL converters with the same configurations. The single DAB dc-dc converter has been extensively investigated, but its modular-ized converter systems such as input-parallel output-parallel (IPOP), input-independent output-parallel (IIOP), in-put-parallel output-series (IPOS), and input-series output-parallel (ISOP) configurations have been seldomly covered in the existing research. Particularly, it is emergent to improve the dynamics, e.g. the input-voltage disturbance, the load-condition change and the power sharing disturbance. In this work, the advanced dynamic controls for these modular DAB dc-dc converter systems are proposed, featuring the flexible power sharing control performances with fast-dynamic responses. Moreover, to realize the reliable operation of these DAB-based systems, the hot swap operations are presented. To ensure the desired power sharing performance, the circuit-parameter estimating methods are proposed for these DAB-based converter systems. This work expands scope of the application of the DAB-based converter system in the partial power processing (PPP). Different from the existing literatures focusing on embedding renewable energy source into the strong ac system, this work proposes a PPP converter system, which can realize the independent control of the renewable energy source and the stabilization of the total dc bus. Combining with DAB module, the DAB-based PPP converter system is proposed. Then, as one of the important functions, the stabilization of the total dc bus should be further improved for this DAB-based converter system. In detail, a high-robustness control strategy is proposed to realize the fast-dynamic control, and the operation when one renewable energy source is out of work is also presented. Notably, the renewable energy should feature the current output and the limited output-voltage regulation such as PV, fuel cell and wind turbine with ac-dc conversion. By using the PV as an example, the effectiveness of the novel system is verified with following results: 1). The maximum power point tracking of the PV panels can be realized by using the existing method. 2). By using the proposed high-robustness control scheme, the total dc-link voltage can maintain at its desired value when the irradiance of PV panels, the voltage of the battery and the load condition are changed, and even when the PV panel is heavily shaded.
Author: Guo Xu
Publisher: Springer Nature
ISBN: 9819748569
Category :
Languages : en
Pages : 328
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Author: Yasen Abdullahi Harrye
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Zhiqiang Guo
Publisher: Springer Nature
ISBN: 9813299347
Category : Technology & Engineering
Languages : en
Pages : 243
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Book Description
This book presents a series of new topologies and modulation schemes for soft-switching in isolated DC–DC converters. Providing detailed analyses and design procedures for converters used in a broad range of applications, it offers a wealth of engineering insights for researchers and students in the field of power electronics, as well as stimulating new ideas for future research.
Author: Àlber Filbà Martínez
Publisher:
ISBN:
Category :
Languages : en
Pages : 184
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Book Description
Galvanically-isolated bidirectional dc-dc converters (IBDCs) have recently received more attention due to its increasing use in systems requiring energy transfer between two dc networks in both directions, requiring galvanic isolation and a high voltage gain. Some of these systems are energy storage systems, vehicle-to-grid power interfaces, fuel cell energy systems, uninterruptable power supplies, high-voltage dc links for electric-energy transmission, and solid-state transformers.The most prominent IBDC, thanks to its good performance, is the dual-active-bridge (DAB) converter. It features a high power density, a wide dc-voltage gain working range, a low count of passive components, and an exceptional transformer utilization. Nevertheless, the DAB converter suffers from a significant performance deterioration when operating at conditions different from its nominal design working point. This problem has been alleviated by designing complex modulation schemes, which require a high computational effort and are highly dependent on the parasitic-component values. On the other hand, as DAB converters have been lately introduced in high-power applications, higher voltages are needed in the dc links in order to achieve reasonable efficiency values. This has led to the use of multilevel topologies on the DAB converters, mainly multilevel neutral-point-clamped (NPC) topologies. However, the little and recent literature in this topic have not fully explored the operational capabilities and performance benefits of multilevel DAB converters.The aim of this thesis is to study the viability of multilevel NPC DAB (ML-DAB) converters, where the major faced challenge is the dc-link capacitors voltage balancing. First, three particular ML-DAB converters are studied, with the same number of levels on each side; the three-level, four-level, and five-level topologies (3L-DAB, 4L-DAB, and 5L-DAB, respectively). Suitable switching sequences, modulation schemes, and control schemes are designed for the proposed ML-DAB converters. The converter switching and conduction losses are studied with three figures of merit, resulting in a set of practical solutions that define the modulation parameters and achieve satisfactory converter-performance figures. These results are then generalized to the N-level topology (NL-DAB). Finally, the feasibility of ML-DAB converters with an asymmetric number of levels is also demonstrated.
Author: Nie Hou
Publisher: Springer
ISBN: 9783031729621
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
High-Robust Control Schemes for Dual-Active-Bridge-Based DC-DC Converter Systems in Renewable Energy Applications is the first book that presents systematic control schemes for multiple DAB-based DC-DC converter systems. The book explores new control methods for various DAB DC-DC converters for high-power applications. These methods include fast-dynamic control, power balance control, soft start-up operation, hot-swap operation, and circuit-parameter estimation. Additionally, the book studies a DAB-based partial power processing DC-DC converter system designed to embed the renewable energy source and the energy storage system for boosting the utilization of components. The book also verifies the dynamic equivalence between the DAB converter and other intermediary inductive AC-link DC-DC converters, which can be helpful in designing control systems for other AC-link-based DC-DC converter systems. This book is a valuable reference for graduate students in electrical engineering, researchers, and power electronics engineers working in manufacturing, renewable energy, and utility industries. In addition, this book: Presents a systematic study of DAB-based converter systems; Highlights new control methods for DAB DC-DC converters for high-power applications; Examines embedding energy sources and storage systems to boost the utilization of renewable energy.
Author: Christian Richard
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Recent trends in power system operation have been constructed to implement controlled and bi-directional power flows on the load side. Such power flows have facilitated the implementation of the load-follows-generation new strategy for operating power systems. In addition, the successful implementation of controlled and bi-directional power flows has supported the integration of different types of distributed generation and storage (DGS) units. These new generation assets are typically interconnected to distribution systems by stages of power electronic converters (PECs). The back-to-back, modular, and solid-state transformers are examples of PEC topologies used to interconnect DGS units. The major functions of PECs in DGS units, include converting, processing, and controlling the electric power to meet certain conditions imposed by the host grid. These conditions mandate the design of controllers to accurately and effectively operate stages of PECs in stable and reliable manners. Among the key PECs to implement controlled and bi-directional power flows are the conventional and resonant dual active bridge (DAB) dc PECs. These bi-directional dc PECs are widely used to construct active DC-links in many applications, such as voltage and reactive power compensation, motor drives, plasma generation units, etc. The employment of DAB dc PECs in power systems requires the design and implementation of accurate, fast, and reliable controllers. This thesis aims to design, implement, and test linear-quadratic regulator (LQR) controllers for the DAB and resonant DAB dc PECs. The design of an LQR controller is achieved by the development of linearized models for the DAB and resonant DAB dc PECs. These models are developed to accommodate the switching scheme, as well as the relationship between the duty cycle and reference voltages. Furthermore, the developed models for DAB and resonant DAB dc PECs are used to devise a tuning procedure for the designed LQR controllers. The performance of the designed LQR controllers is tested for the DAB and the resonant DAB dc PECs under different conditions. Tested conditions include step changes in the power flow, changes in the voltage on the input side of the PEC, and bi-directional power flows. The results of these tests show that designed LQR controllers can operate DAB and resonant DAB dc PECs to adjust input and output voltages during step changes in the power flow, changes in the direction of the power flow, and changes in the voltage. Observed performance features are also compared with other controllers under similar conditions. Test and comparison results demonstrate the efficacy of the designed LQR controllers to operate DAB and resonant DAB dc PECs under different loading and dynamic conditions.
