[PDF] Characteristic Investigation And Control Of A Modular Multilevel Converter Based Hvdc System Under Single Line To Ground Fault Conditions eBook

Author :
Publisher :
Page : 14 pages
File Size : 30,63 MB
Release : 2014
Category :
ISBN :

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This paper presents the analysis and control of a multilevel modular converter (MMC)-based HVDC transmission system under three possible single-line-to-ground fault conditions, with special focus on the investigation of their different fault characteristics. Considering positive-, negative-, and zero-sequence components in both arm voltages and currents, the generalized instantaneous power of a phase unit is derived theoretically according to the equivalent circuit model of the MMC under unbalanced conditions. Based on this model, a novel double-line frequency dc-voltage ripple suppression control is proposed. This controller, together with the negative-and zero-sequence current control, could enhance the overall fault-tolerant capability of the HVDC system without additional cost. To further improve the fault-tolerant capability, the operation performance of the HVDC system with and without single-phase switching is discussed and compared in detail. Lastly, simulation results from a three-phase MMC-HVDC system generated with MATLAB/Simulink are provided to support the theoretical analysis and proposed control schemes.

Author : Kamran Sharifabadi
Publisher : John Wiley & Sons
Page : 414 pages
File Size : 39,6 MB
Release : 2016-10-17
Category : Science
ISBN : 1118851560

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Design, Control and Application of Modular Multilevel Converters for HVDC Transmission Systems is a comprehensive guide to semiconductor technologies applicable for MMC design, component sizing control, modulation, and application of the MMC technology for HVDC transmission. Separated into three distinct parts, the first offers an overview of MMC technology, including information on converter component sizing, Control and Communication, Protection and Fault Management, and Generic Modelling and Simulation. The second covers the applications of MMC in offshore WPP, including planning, technical and economic requirements and optimization options, fault management, dynamic and transient stability. Finally, the third chapter explores the applications of MMC in HVDC transmission and Multi Terminal configurations, including Supergrids. Key features: Unique coverage of the offshore application and optimization of MMC-HVDC schemes for the export of offshore wind energy to the mainland. Comprehensive explanation of MMC application in HVDC and MTDC transmission technology. Detailed description of MMC components, control and modulation, different modeling approaches, converter dynamics under steady-state and fault contingencies including application and housing of MMC in HVDC schemes for onshore and offshore. Analysis of DC fault detection and protection technologies, system studies required for the integration of HVDC terminals to offshore wind power plants, and commissioning procedures for onshore and offshore HVDC terminals. A set of self-explanatory simulation models for HVDC test cases is available to download from the companion website. This book provides essential reading for graduate students and researchers, as well as field engineers and professionals who require an in-depth understanding of MMC technology.

Author : Chan-ki Kim
Publisher : World Scientific
Page : 497 pages
File Size : 30,19 MB
Release : 2021-04-09
Category : Technology & Engineering
ISBN : 9811213593

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HVDC grids and super grids have sparked so much interest these days that researchers and engineers across the globe are talking about them, studying them, supporting them, or questioning them. This book provides valuable information for researchers, industry, and policy makers. It explains why HVDC is favorable over AC technologies for power transmission; what the key technologies and challenges are for developing an HVDC grid; how an HVDC grid will be designed and operated; and how future HVDC grids will evolve. The book also devotes significant attention to nontechnical aspects such as the influence of energy policy and regulatory frameworks.This book is a result of collaboration between industry and academia. It provides theoretical insights into the design and control of MMC technology and investigates practical aspects of the project planning, design, manufacture, implementation, and commissioning of MMC-HVDC and multi-terminal HVDC transmission technologies; filling the knowledge gap between the technology specialists and VSC-HVDC project developers and key personnel involved in those projects.

Author : Neeraj Priyadarshi
Publisher : CRC Press
Page : 619 pages
File Size : 32,98 MB
Release : 2023-03-31
Category : Technology & Engineering
ISBN : 1000850978

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This book narrates an assessment of numerous advanced power converters employed on primitive phase to enhance the efficiency of power translation pertaining to renewable energy systems. It presents the mathematical modelling, analysis, and control of recent power converters topologies, namely, AC/DC, DC/DC, and DC/AC converters. Numerous advanced DC-DC Converters, namely, multi-input DC-DC Converter, Cuk, SEPIC, Zeta and so forth have been assessed mathematically using state space analysis applied with an aim to enhance power efficiency of renewable energy systems. The book: Explains various power electronics converters for different types of renewable energy sources Provides a review of the major power conversion topologies in one book Focuses on experimental analysis rather than simulation work Recommends usage of MATLAB, PSCAD, and PSIM simulation software for detailed analysis Includes DC-DC converters with reasonable peculiar power rating This book is aimed at researchers, graduate students in electric power engineering, power and industrial electronics, and renewable energy.

Author : Xiaojie Shi
Publisher :
Page : 226 pages
File Size : 11,91 MB
Release : 2015
Category : Electric power distribution
ISBN :

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To take full advantage of multilevel modular converter (MMC) and extend its application in high voltage direct current (HVDC) transmission systems, the ability to deal with severe unbalanced conditions, especially under single-line-to-ground (SLG) fault, is a key requirement. This dissertation deals with the development of a fault handling strategy, which helps HVDC systems achieve continuous energy supply and desired operation performance under temporary SLG fault conditions while ensuring a smooth and fast black start for MMC-HVDC particularly if the system has to shut down when a permanent SLG fault occurs. Several related research topics will be discussed in this dissertation. First, a steady-state model of MMC for second order phase voltage ripple prediction under unbalanced conditions is proposed. From the steady-state model, a circular relationship is found to evaluate the magnitudes and initial phase angles of different circulating current components. Moreover, the derivation of the equivalent dc impedance of a MMC is discussed as well. Second, the analysis and control of a MMC based HVDC transmission system under three possible SLG fault conditions are discussed. Based on the derived steady state model, a novel double line frequency dc voltage ripple suppression control is proposed. This controller, together with the phase and circulating current control, could enhance the overall fault-tolerant capability of the HVDC system without additional costs. Third, the small signal model of the capacitor charging loop in a MMC inverter is first derived according to the internal dynamics of the MMC inverter. Based on this model, a novel startup strategy incorporating an averaging capacitor voltage loop and a feedforward control is proposed for enhanced dynamic response and system stability. Finally, a cascaded droop control scheme is proposed for multi-terminal HVDC systems to deal with dc overvoltage under onshore converter side SLG fault. Using ac voltage magnitude as an intermediate variable, the dc voltage information of offshore converters can be transferred to windfarms (WFs) and adjust their active power generation without any communication. With such control scheme, performance of the studied four-terminal HVDC system under various fault conditions are analyzed and compared.

Author : Kamran Sharifabadi
Publisher : John Wiley & Sons
Page : 522 pages
File Size : 20,14 MB
Release : 2016-08-22
Category : Science
ISBN : 1118851544

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Design, Control and Application of Modular Multilevel Converters for HVDC Transmission Systems is a comprehensive guide to semiconductor technologies applicable for MMC design, component sizing control, modulation, and application of the MMC technology for HVDC transmission. Separated into three distinct parts, the first offers an overview of MMC technology, including information on converter component sizing, Control and Communication, Protection and Fault Management, and Generic Modelling and Simulation. The second covers the applications of MMC in offshore WPP, including planning, technical and economic requirements and optimization options, fault management, dynamic and transient stability. Finally, the third chapter explores the applications of MMC in HVDC transmission and Multi Terminal configurations, including Supergrids. Key features: Unique coverage of the offshore application and optimization of MMC-HVDC schemes for the export of offshore wind energy to the mainland. Comprehensive explanation of MMC application in HVDC and MTDC transmission technology. Detailed description of MMC components, control and modulation, different modeling approaches, converter dynamics under steady-state and fault contingencies including application and housing of MMC in HVDC schemes for onshore and offshore. Analysis of DC fault detection and protection technologies, system studies required for the integration of HVDC terminals to offshore wind power plants, and commissioning procedures for onshore and offshore HVDC terminals. A set of self-explanatory simulation models for HVDC test cases is available to download from the companion website. This book provides essential reading for graduate students and researchers, as well as field engineers and professionals who require an in-depth understanding of MMC technology.

Author : Muhammad H. Rashid
Publisher : Butterworth-Heinemann
Page : 1522 pages
File Size : 32,10 MB
Release : 2017-09-09
Category : Technology & Engineering
ISBN : 0128114088

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Power Electronics Handbook, Fourth Edition, brings together over 100 years of combined experience in the specialist areas of power engineering to offer a fully revised and updated expert guide to total power solutions. Designed to provide the best technical and most commercially viable solutions available, this handbook undertakes any or all aspects of a project requiring specialist design, installation, commissioning and maintenance services. Comprising a complete revision throughout and enhanced chapters on semiconductor diodes and transistors and thyristors, this volume includes renewable resource content useful for the new generation of engineering professionals. This market leading reference has new chapters covering electric traction theory and motors and wide band gap (WBG) materials and devices. With this book in hand, engineers will be able to execute design, analysis and evaluation of assigned projects using sound engineering principles and adhering to the business policies and product/program requirements. Includes a list of leading international academic and professional contributors Offers practical concepts and developments for laboratory test plans Includes new technical chapters on electric vehicle charging and traction theory and motors Includes renewable resource content useful for the new generation of engineering professionals

Author : Akhtar Kalam
Publisher : Springer Nature
Page : 1011 pages
File Size : 35,37 MB
Release : 2019-12-16
Category : Technology & Engineering
ISBN : 9811502145

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The book compiles the research works related to smart solutions concept in context to smart energy systems, maintaining electrical grid discipline and resiliency, computational collective intelligence consisted of interaction between smart devices, smart environments and smart interactions, as well as information technology support for such areas. It includes high-quality papers presented in the International Conference on Intelligent Computing Techniques for Smart Energy Systems organized by Manipal University Jaipur. This book will motivate scholars to work in these areas. The book also prophesies their approach to be used for the business and the humanitarian technology development as research proposal to various government organizations for funding approval.

Author : Jiajie Zang
Publisher :
Page : 0 pages
File Size : 13,31 MB
Release : 2022
Category :
ISBN :

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Conventional radial AC distribution systems cannot effectively accommodate the rapidly increasing renewable energy sources (RESs) and new loads such as fast charging stations of electric vehicles. To address the pressing challenges, active distribution grids and DC systems have attracted significant interests with their many potential benefits. Considering that AC and DC systems will coexist in future distribution grids wherever suitable, hybrid AC/DC distribution is regarded as a promising and practical solution for future distribution systems. The focus of this work, multiport interlink modular multilevel converter-based solid-state transformers (iMMC-SSTs), is expected to play a key enabling role in hybrid distribution systems to integrate different grid entities, including both AC and DC networks at both medium and low voltage levels. The iMMC-SST features capabilities such as bidirectional power transfer, fault isolation and restoration, system reconfiguration, and voltage regulation. However, power electronics-based SSTs are more vulnerable under abnormal conditions, which hinders their adoption in practical systems. The high number of circuit elements are potential fault sources in the iMMC-SST. The possible faults of the SST and the connected feeders can destroy balance of the system and even result in second faults. A comprehensive protection scheme for the iMMC-SST is indispensable to ensure the device's safety and improve the system's reliability and robustness. Based on the fault location, abnormal conditions are in general divided into external and internal types. In this work, grounding scheme for the SST is designed and investigated to address typical external fault conditions such as the single line-to-ground (SLG) short-circuit fault and single pole-to-ground (SPG) short-circuit fault. For internal abnormal conditions, power switch faults are of major concerns of the iMMC-SST since a switch failure will lead to arm voltage imbalance, circulating current increase, and second faults. The submodule (SM) switch open-circuit (OC) fault analysis is presented considering different operation modes of the iMMC-SST in Chapter 4. Unlike traditional MMC applications, the iMMC-SST has different fault characteristics, and the previous fault diagnosis and fault-tolerant schemes developed for other applications are not applicable here. Based on detailed analysis of the fault behaviors, a fault-tolerant scheme based on the global redundant module and unbalanced control is proposed in Chapter 5. Similarly, the dual active bridge (DAB) switch OC fault is studied in detail, and a DC current injection fault-tolerant method is proposed to address the overcurrent and transformer saturation issues in Chapter 6. The proposed solutions and their analysis are verified with MATLAB simulations and experiments with scaled-down laboratory prototypes.

Author : Sixing Du
Publisher : John Wiley & Sons
Page : 360 pages
File Size : 12,14 MB
Release : 2018-01-11
Category : Science
ISBN : 1119366305

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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.