Download or read book Cooperative Power Sharing Control in Multi terminal Voltage Source Converter high Voltage Direct Current written by Hasan Alrajhi Alsiraji and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Multi-terminal high voltage DC (MTDC) system is a viable solution for increasing an electrical power generation to interconnect renewable resources into an AC grid. Using a voltage source converter (VSC) allows independent control of a reactive and an active power flow. Based on the literature, there is a trend to implement MTDC into a distribution grid system in the future. Power sharing control among MTDCs is an important and critical consideration from the point of view of stability and operation. MTDC systems consist of multi-input converters (rectifiers) and single or multi-output converters (inverters), thus controlling and operating MTDC systems pose many challenges due to their complexity. Since the DC link in MTDC systems might have several connection nodes all having a common DC voltage value, using the DC voltage value as a common reference for all terminal control loops makes it possible to get a cooperative control performance. An economical autonomous control to share active power among MTDC systems based on the availability of active power or power management policy is proposed in this thesis. Power sharing among MTDC systems has a priority or sequential procedural problem because of the use of the conventional droop strategy. On the other hand, using predefined or constant power sharing does not provide the available power that can be shared when it is not being consumed by another inverter. The proposed strategy solves these issues using different options. In this thesis, the test system consists of four simulated VSC terminals based on a detailed switching VSC model with two AC voltage levels. The MTDC system is simulated in a PSCAD/EMTDC environment. The simulation results show a significant decrease in operational costs and protection from overloading which had been an issue.

Download or read book Multi terminal High voltage Converter written by Bo Zhang and published by John Wiley & Sons. This book was released on 2018-10-19 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Modeling and Control of Multi terminal Voltage Source Converter Based High Voltage Direct Current MTDC Transmission written by Chuanlong Zhu and published by . This book was released on 2011 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Self Commutating Converters for High Power Applications written by Jos Arrillaga and published by John Wiley & Sons. This book was released on 2010-01-12 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: For very high voltage or very high current applications, the power industry still relies on thyristor-based Line Commutated Conversion (LCC), which limits the power controllability to two quadrant operation. However, the ratings of self-commutating switches such as the Insulated-Gate Bipolar Transistor (IGBT) and Integrated Gate-Commutated Thyristor (IGCT), are reaching levels that make the technology possible for very high power applications. This unique book reviews the present state and future prospects of self-commutating static power converters for applications requiring either ultra high voltages (over 600 kV) or ultra high currents (in hundreds of kA). It is an important reference for electrical engineers working in the areas of power generation, transmission and distribution, utilities, manufacturing and consulting organizations. All topics in this area are held in this one complete volume. Within these pages, expect to find thorough coverage on: modelling and control of converter dynamics; multi-level Voltage Source Conversion (VSC) and Current Source Conversion (CSC); ultra high-voltage VSC and CSC DC transmission; low voltage high DC current AC-DC conversion; industrial high current applications; power conversion for high energy storage. This text has a host of helpful material that also makes it a useful source of knowledge for final year engineering students specializing in power engineering, and those involved in postgraduate research.

Download or read book Multilevel Voltage Source Converters in High Voltage Direct Current Transmission Systems written by Yushu Zhang and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research focuses on voltage source multilevel converters in high voltage direct current (HVDC) transmission systems. The first Voltage Source Converter based HVDC (VSC-HVDC) systems with series connected IGBTs in a two-level converter represented a solution to meet industrial and economical requirements but is associated with significant drawbacks such as high dv/dt and di/dt, high switching loss, and poor output voltage and current quality. To overcome these issues, the multilevel converter was proposed for HVDC application. The Modular Multilevel Converter (M2C) was the first multilevel converter to be commercially used in the power industry. In this thesis, the M2C is investigated mainly in terms of operating principle, capacitor size and capacitor voltage ripple, capacitor voltage balancing technique and modulation scheme. The results of this investigation show that the M2C offers the following features: improved efficiency, lower supporting voltage and current in the switching devices and low dv/dt. These features make the M2C suitable for HVDC systems. Two new operational principles and modulation strategies for a Hybrid Cascaded Multilevel Converter (HCMC) are proposed in this thesis. Both modulation schemes extend the modulation index linear range and improve the output waveform quality. This gives the HCMC a higher power density than any known multilevel converter topology for the same dc link voltage and switching device rating. Simulations for both types of multilevel converter (M2C and HCMC) are supported by practical results from scaled hardware laboratory converters. Mathematical analysis and calculation of conversion loss for both types of multilevel converter and for the conventional two-level converter are performed. It is shown that both M2C and HCMC provide lower conversion loss compare to the conventional two-level converter. A control strategy for these two multilevel converters in point-to-point and multi-terminal HVDC systems is also studied. Simulation results show that these two converters are able to operate over the entire specified P-Q capability curve and are capable of riding through ac faults without imposing any over-voltage or over-current on the converter switches.

Download or read book Emerging Power Converters for Renewable Energy and Electric Vehicles written by Md. Rabiul Islam and published by CRC Press. This book was released on 2021-05-30 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers advancements of power electronic converters and their control techniques for grid integration of large-scale renewable energy sources and electrical vehicles. Major emphasis is on transformer-less direct grid integration, bidirectional power transfer, compensation of grid power quality issues, DC system protection and grounding, interaction in mixed AC/DC systems, AC and DC system stability, design of high-frequency high power density systems with advanced soft magnetic materials, modeling and simulation of mixed AC/DC systems, switching strategies for enhanced efficiency, and protection and reliability for sustainable grid integration. This book is an invaluable resource for professionals active in the field of renewable energy and power conversion. Md. Rabiul Islam received his PhD from the University of Technology Sydney (UTS), Australia. He was appointed as a Lecturer at Rajshahi University of Engineering & Technology (RUET) in 2005 and promoted to full-term Professor in 2017. In early 2018, he joined the School of Electrical, Computer, and Telecommunications Engineering, University of Wollongong, Australia. He is a Senior Member of IEEE. His research interests include the fields of power electronic converters, renewable energy technologies, power quality, electrical machines, electric vehicles, and smart grids. He has authored or coauthored more than 200 publications including 50 IEEE Transactions/IEEE Journal papers. He has been serving as an editor for IEEE Transactions on Energy Conversion and IEEE Power Engineering Letters, and associate editor for IEEE Access. Md. Rakibuzzaman Shah is a Senior Lecturer with the School of Engineering, Information Technology and Physical Science at Federation University Australia. He has worked and consulted with distribution network operators and transmission system operators on individual projects and has done collaborative work on a large number of projects (EPSRC project on multi-terminal HVDC, Scottish and Southern Energy multi-infeed HVDC) - primarily on the dynamic impact of integrating new technologies and power electronics into large systems. He is an active member of the IEEE and CIGRE. He has more than 70 international publications and has spoken at the leading power system conferences around the world. His research interests include future power grids (i.e., renewable energy integration, wide-area control), asynchronous grid connection through VSC-HVDC, application of data mining in power system, distribution system energy management, and low carbon energy systems. Mohd. Hasan Ali is currently an Associate Professor with the Electrical and Computer Engineering Department at the University of Memphis, USA, where he leads the Electric Power and Energy Systems (EPES) Laboratory. His research interests include advanced power systems, smart-grid and microgrid systems, renewable energy systems, and cybersecurity issues in modern power grids. Dr. Ali has more than 190 publications, including 2 books, 4 book chapters, 2 patents, 60 top ranked journal papers, 96 peer-reviewed international conference papers, and 20 national conference papers. He serves as the editor of the IEEE Transactions on Sustainable Energy and IET-Generation, Transmission and Distribution (GTD) journal. Dr. Ali is a Senior Member of the IEEE Power and Energy Society (PES). He is also the Chair of the PES of the IEEE Memphis Section.

Download or read book Control of Power Electronic Converters and Systems written by Frede Blaabjerg and published by Academic Press. This book was released on 2018-04-27 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Download or read book HVDC and FACTS Controllers written by Vijay K. Sood and published by Springer Science & Business Media. This book was released on 2006-04-18 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: HVDC and FACTS Controllers: Applications of Static Converters in Power Systems focuses on the technical advances and developments that have taken place in the past ten years or so in the fields of High Voltage DC transmission and Flexible AC transmission systems. These advances (in HVDC transmission and FACTS) have added a new dimension to power transmission capabilities. The book covers a wide variety of topics, some of which are listed below: -Current Source and Voltage Source Converters, -Synchronization Techniques for Power Converters, -Capacitor Commutated Converters, -Active Filters, -Typical Disturbances on HVDC Systems, -Simulation Techniques, -Static Var Compensators based on Chain Link Converters, -Advanced Controllers, -Trends in Modern HVDC. In addition to EHV transmission, HVDC technology has impacted on a number of other areas as well. As an example, a chapter dealing with HVDC Light applications is included providing recent information on both on-shore and off-shore applications of wind farms.

Download or read book Power System Flexibility written by Ming Zhou and published by Springer Nature. This book was released on 2023-03-01 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a detailed description of the flexibility of the power system with high share of variable renewable generation, including power system flexibility modeling, flexibility-based economic dispatch, demand side flexibility response, large-scale distributed flexible resources aggregation and market design for enhancing the flexibility of the power system, etc. The book provides an appropriate blend of theoretical background and practical applications of the power system flexibility, which are developed as working algorithms, coded in MATLAB and GAMS environments. This feature strengthens the usefulness of the book for graduate students and practitioners. Students will gain an insightful understanding of the flexibility of the power system with high share of renewables integration, including: (1) the formulation of flexibility modeling and flexibility-based economic dispatch models, (2) the familiarization with efficient solution algorithms for such models, (3) insights into these problems through the detailed analysis of numerous illustrative examples and (4) market design approach for enhancing the flexibility of the power system. Hopefully, this book greatly benefits readers in the fields of energy economics and engineering.

Download or read book Control and Protection of Multi terminal DC Transmission Systems Based on Voltage source Converters written by Lianxiang Tang and published by . This book was released on 2003 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Digital simulations have been used to demonstrate the feasibility of the control and protection strategies." --

Download or read book Control of Voltage Source Converter Based High Voltage Direct Current Transmission Systems for Grid Code Compliance written by Xudan Liu and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Control and Application of Modular Multilevel Converters for HVDC Transmission Systems written by Kamran Sharifabadi and published by John Wiley & Sons. This book was released on 2016-08-22 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Advanced Control and Synchronization Approaches of Voltage Source Converters for Integration of Distributed Energy Resources written by Malek Ramezani and published by . This book was released on 2018 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Voltage source converter (VSC) is an inseparable interfacing fixture for utilizing distributed energy resource (DER) as an AC power supply. This dissertation investigates different control and synchronization techniques for stand-alone and grid-connected DC-AC VSCs. The most common control reference frame for VSCs is the dq reference frame (dq-RF), also known as the synchronous reference frame. The main challenge associated with the VSC control in this reference frame is the strong coupling between d and q axes. In this dissertation, a multi-loop dq-RF control system with a coupling compensation scheme is presented. Then, the droop-based power control technique, which eliminates the need for communication between parallel-connected VSCs and consequently offers a higher reliability, is investigated. A dq-RF-based approach of impedance design, for compensating the inequality of parallel VSCs connecting lines, along with the dq-RF droop control are also proposed. This approach results in an accurate power-sharing among parallel VSCs. The major challenges related to the synchronization unit of a grid-connected VSC control system in the presence of a distorted AC voltage are also briefly investigated in this dissertation. To deal with these challenges, an enhanced complex coefficient filter based PLL is designed and presented. This PLL completely removes the grid voltage imbalance and considerably attenuates the grid voltage dc offset and harmonics while maintaining a fast dynamic response and a simple structure. The VSC-interfaced DER is often required to switch between the islanded and grid-connected operation modes. The VSC integrated into the grid is current-controlled, while in the islanded operation mode is controlled as a voltage source. In the transition between these two modes, first the intended VSC operation mode should be detected, then its control system is reconfigured. To avoid the complexity of the control system and alleviate the drawbacks associated with the control mode transition, a VSC control approach, which mimics the traditional synchronous generator's universal mode of operation, is studied. A method of power-based active synchronization of the VSC-interfaced DER, with the ability of seamless transition between the islanded mode and connected to the grid, is proposed and integrated with this technique of the VSC control.

Download or read book Voltage Source Converter written by Grain Adam and published by . This book was released on 2013-12-01 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last two decades, the uses of voltage source converter in power systems have increased significantly in electricity generation, transmission and distribution systems. These increases are expected to continue with the current trend toward decentralized power systems, increased penetration of renewable power into ac grids, smart grids and dc grids. Such increases in the uses of the power electronic devices and systems in today and future power systems are expected to alter ac grids characteristics and responses to major disturbances. Understanding behaviour of ac grids with such increased complexity requires new generations of power systems and power electronics engineers, with greater knowledge of both power electronics and power systems. This book is written with the primary objective of describing the aspects of the traditional and emerging voltage source converters, which are relevant to system focus readers, without ignoring some of the important device aspects from the converter modelling and system prospective. In addition, this book covered most of the recent developments in the voltage source converters and high-voltage dc transmission systems, with the intention of shortening the learning curve for many readers. The first chapters of this book are devoted to key device aspects such as operating principles and modulation strategies, modelling approaches that are applicable to different voltage source converters and their attributes and limitations, and control strategies. The later chapters focus in applications of these converters in power systems. The expected beneficiaries from the materials presented in this book are final years electrical and electronic engineering students, post-graduate masters and research students, power electronic systems and power systems engineers, research and development engineers, and professional and practitioners working within consultancies.

Download or read book Consensus and Synchronization in Complex Networks written by Ljupco Kocarev and published by Springer. This book was released on 2013-01-18 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book for the first time two scientific fields - consensus formation and synchronization of communications - are presented together and examined through their interrelational aspects, of rapidly growing importance. Both fields have indeed attracted enormous research interest especially in relation to complex networks. In networks of dynamic systems (or agents), consensus means to reach an agreement regarding a certain quantity of interest that depends on the state of all dynamical systems (agents). Consensus problems have a long history in control theory and computer sciences, and form the foundation of the field of distributed computing. Synchronization, which defines correlated-in-time behavior between different processes and roots going back to Huygens to the least, is now a highly popular, exciting and rapidly developing topic, with applications ranging from biological networks to mathematical epidemiology, and from processing information in the brain to engineering of communications devices. The book reviews recent finding in both fields and describes novel approaches to consensus formation, where consensus is realized as an instance of the nonlinear dynamics paradigm of chaos synchronization. The chapters are written by world-known experts in both fields and cover topics ranging from fundaments to various applications of consensus and synchronization.

Download or read book Nonlinear Control and Stability Analysis of Multi Terminal High Voltage Direct Current Networks written by Yijing Chen and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation was devoted to the study of multi-terminal high voltage direct current (MTDC) networks. The main contributions were in the field of nonlinear automatic control, applied to power systems, power electronics and renewable energy sources. The research work was started with the intention of filling some gaps between the theory and the practice, in particular: 1) to investigate various control approaches for the purpose of improving the performance of MTDC systems; 2) to establish connections between existing empirical control design and theoretical analysis; 3) to improve the understanding of the multi-time-scale behavior of MTDC systems characterized by the presence of slow and fast transients in response to external disturbances. As a consequence, this thesis work can be put into three areas, namely nonlinear control design of MTDC systems, analysis of MTDC system's dynamic behaviors and application of MTDC systems for frequency control of AC systems.

Download or read book Reduced order Modeling of the Parallel Hybrid Modular Multilevel Converter written by Curtis Shumski and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the demand for electrical power continues to increase, so does the attractiveness of high voltage direct current (HVDC) transmission networks to transfer power from generating stations to load centers. Located at either end of the HVDC transmission network are converter stations that convert the AC power into DC power, and vice versa. A voltage source converter (VSC) commonly used in practice is the modular multilevel converter (MMC); however, these converters require many power electronic switches that will significantly increase the cost of such HVDC networks. A cost-effective alternative to these converters is the parallel hybrid MMC (PH-MMC), which is the focus of this thesis. Modeling VSCs in large electrical networks can be a computational burden as a small time step is required to capture all of the switching transients of the VSC. In some situations, it may not be necessary to simulate every switching instant, and instead a reduced-order model can be utilized. The reduced order model of VSCs retain the behavior of the converters, while being able to run at a larger time step and at a much faster simulation runtime. The basic principles of MMCs are first derived and the topological changes of the PH-MMC are analyzed. Comparisons between the PH-MMC and conventional MMCs are drawn to showcase the advantages and disadvantages of the PH-MMC. Control algorithms are described for basic operation of the PH-MMC, and control block diagrams are detailed to control the sub-module capacitor voltages as well as the AC terminal outputs. A qualitative fault analysis is provided for both AC and DC side faults, and a reduced-order model is developed to accurately model the PH-MMC in electromagnetic transient (EMT) studies by removing the need to model high frequency switching instants. Using a simple network model and a more complex network model, dynamic simulations are performed in PSCADTM/EMTDCTM software to validate the reduced-order model against the full, detailed switching model. Simulation results show that the developed reduced-order model is an accurate representation of the PH-MMC, while significantly decreasing the runtime to carry out such simulations as compared to the detailed model. When incorporating PH-MMCs into larger networks, the reduced-order model developed in this thesis can be used to alleviate the computational burden of using a small time step while maintaining the low frequency behavior of the converter.