[PDF] Analysis And Control Of Vsc Based Hvdc System Under Single Line To Ground Fault Conditions eBook

Author : Xiaojie Shi
Publisher :
Page : 226 pages
File Size : 39,3 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 : Nagwa F. Ibrahim
Publisher : Springer Nature
Page : 131 pages
File Size : 16,24 MB
Release : 2020-09-12
Category : Technology & Engineering
ISBN : 303051661X

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This book looks at the control of voltage source converter based high voltage direct current (VSC-HVDC). The objective is to understand the control structure of the VSC-HVDC system and establish the tuning criteria for the proportional-integral (PI) control of the converter controllers. Coverage includes modeling of the VSC-based HVDC transmission system using MATLAB and Simulink simulation package; implementation of control strategies for the VSC-based HVDC transmission system; and analysis of the developed system behavior under different conditions (normal and fault conditions). The book provides researchers, students, and engineers working in electrical power system transmission and power electronics and control in power transmission with a good understanding of the VSC-based HVDC transmission system concept and its behavior.

Author :
Publisher :
Page : 14 pages
File Size : 31,63 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 : 48,67 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 : 44,77 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 : Amitabh Beuria
Publisher :
Page : 0 pages
File Size : 10,4 MB
Release : 2020
Category :
ISBN :

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This paper implements the AC voltage control of HVDC using superconducting fault current limiter (SFCL) in AC voltage control of LCC HVDC using controllable capacitors. Also to analyze the behavior of a Voltage Source Converter Based HVDC system under DC pole to ground fault & AC fault. HVDC (HVDC) systems involving overhead transmission lines are prone to severe over-currents and over-voltages during dc line faults. The development of VSC-based dc networks is constrained by the lack of operational experience, the immaturity of appropriate protective devices and the lack of appropriate fault analysis techniques. VSCs are vulnerable to dc cable short-circuits and ground faults due to the high discharge current from the dc link capacitance. The SFCL utilizes both superconducting coils (SCs) and resistance to limit the rapidly growing current. Firstly, the working principle and operating characteristics of the SFCL are studied. Secondly, the rules of parameters coordination are analyzed in order to obtain the best current limiting effect of the SFCL. Thirdly, the electromagnetic design of SCs is done to prove the feasibility of the scheme.

Author : Farrukh Rashid
Publisher : Lulu.com
Page : 86 pages
File Size : 31,85 MB
Release : 2014-08-06
Category : Technology & Engineering
ISBN : 1312414391

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In back to back HVDC technology we can easily control the flow of power and synchronize two different systems. Our project is based on the simulation studies and thus the feasibility of this Back to Back HVDC system which will be incorporated between Pakistan and India over a distance of less than 100 km. For simulation, the software used is Power System Simulator for Engineers, PSS/E. The working of this software is discussed in detail. In our thesis we have discussed back to back HVDC both theoretically and through simulation. They are employed on the India to Pakistan power transfer. The stability and thus the feasibility of this project is proved by simulation in PSS/E. Different types of transients have been applied to the system and stability of various parameters has been studied.

Author : Dirk Van Hertem
Publisher : John Wiley & Sons
Page : 589 pages
File Size : 31,49 MB
Release : 2016-02-23
Category : Technology & Engineering
ISBN : 111911523X

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This book discusses HVDC grids based on multi-terminal voltage-source converters (VSC), which is suitable for the connection of offshore wind farms and a possible solution for a continent wide overlay grid. HVDC Grids: For Offshore and Supergrid of the Future begins by introducing and analyzing the motivations and energy policy drives for developing offshore grids and the European Supergrid. HVDC transmission technology and offshore equipment are described in the second part of the book. The third part of the book discusses how HVDC grids can be developed and integrated in the existing power system. The fourth part of the book focuses on HVDC grid integration, in studies, for different time domains of electric power systems. The book concludes by discussing developments of advanced control methods and control devices for enabling DC grids. Presents the technology of the future offshore and HVDC grid Explains how offshore and HVDC grids can be integrated in the existing power system Provides the required models to analyse the different time domains of power system studies: from steady-state to electromagnetic transients This book is intended for power system engineers and academics with an interest in HVDC or power systems, and policy makers. The book also provides a solid background for researchers working with VSC-HVDC technologies, power electronic devices, offshore wind farm integration, and DC grid protection.

Author : Enrique Acha
Publisher : John Wiley & Sons
Page : 414 pages
File Size : 21,32 MB
Release : 2019-08-05
Category : Technology & Engineering
ISBN : 1119973988

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An authoritative reference on the new generation of VSC-FACTS and VSC-HVDC systems and their applicability within current and future power systems VSC-FACTS-HVDC and PMU: Analysis, Modelling and Simulation in Power Grids provides comprehensive coverage of VSC-FACTS and VSC-HVDC systems within the context of high-voltage Smart Grids modelling and simulation. Readers are presented with an examination of the advanced computer modelling of the VSC-FACTS and VSC-HVDC systems for steady-state, optimal solutions, state estimation and transient stability analyses, including numerous case studies for the reader to gain hands-on experience in the use of models and concepts. Key features: Wide-ranging treatment of the VSC achieved by assessing basic operating principles, topology structures, control algorithms and utility-level applications. Detailed advanced models of VSC-FACTS and VSC-HVDC equipment, suitable for a wide range of power network-wide studies, such as power flows, optimal power flows, state estimation and dynamic simulations. Contains numerous case studies and practical examples, including cases of multi-terminal VSC-HVDC systems. Includes a companion website featuring MATLAB software and Power System Computer Aided Design (PSCAD) scripts which are provided to enable the reader to gain hands-on experience. Detailed coverage of electromagnetic transient studies of VSC-FACTS and VSC-HVDC systems using the de-facto industry standard PSCAD/EMTDC simulation package. An essential guide for utility engineers, academics, and research students as well as industry managers, engineers in equipment design and manufacturing, and consultants.