Download or read book Modeling of Power Systems Implemented with Unified Power Flow Controller Using PSCAD EMTDC written by Yew Fung Chieng and published by . This book was released on 2005 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Testing of Unified Power Flow Controller UPFC Model in IEEE9 Bus Power System Network Using PSCAD EMTDC and MATLAB Software written by Nur Azira Mohd Saleh and published by . This book was released on 2010 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unified Power Flow Controller (UPFC) is the most widely used Flexible ac Transmission system ( FACTS ) device to control the power flow and to optimize the system stability in the transmission line. It should be installed to control the voltage, as well as to control the active and reactive power flow through the transmission line. This project is using PSCAD/EMTDC and MATLAB software to model and to verify the UPFC system in order to improve its performance in power system. MATPOWER in MATLAB software used to run the power flow of IEEE 9 bus power system network. Then, by using PSCAD/EMTDC software, IEEE 9 bus system was designed and the result of power flow 9 bus system using PSCAD/EMTDC was compared with the power flow in MATPOWER. The result of active power, P (MW) , reactive power ,Q (MVar) and power loss were compared to make sure that both software have the similar answer with only 1% difference. The power flow in both softwares must be similar before injecting the UPFC system. Then, the active power and reactive power performance will be improved due to injecting the UPFC device. Stability and transient performance of active and reactive power was analyzed.

Download or read book Unified Power Flow Controller Technology and Application written by Jijun Yin and published by Academic Press. This book was released on 2017-06-16 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unified Power Flow Controller Technology and Application provides comprehensive coverage on UPFC technology, providing a range of topics, including design principle, control and protection, and insulation coordination. It summarizes all the most up-to-date research and practical achievements that are related to UPFC and MMC technology, including test techniques for main components, closed-loop test techniques for control and protection systems, and onsite techniques for implementing UPFC projects. The book is an essential reference book for both academics and engineers working in power system protection control, power system planning engineers, and HVDC FACTS related areas. Readers will not only obtain the detailed information regarding theoretical analysis and practical application of UPFC, but also the control mechanism of advanced MMC technology, both of which are not common topics in previously published books. Shows how to use modular multilevel converters (MMC) to implement UPFC that lead to cost-effective and reliable systems Draws from the most up-to-date research and practical applications Teaches electromechanical/electromagnetic transient simulation techniques and real-time closed-loop simulation test techniques of the MMC based UPFC

Download or read book Modeling of Unified Power Flow Controller Into Power System Using PSCAD written by Siew Wei Lau and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Static and Dynamic Impact of Unified Power Flow Controller UPFC in Electric Transmission System written by Zulkifli Dollah and published by . This book was released on 2008 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unified Power Flow Controller (UPFC) is a part of the Flexible AC Transmission System (FACTS). The main function of UPFC is to control the real and reactive power flow in transmission system, at the same time UPFC will control the voltage at the bus where it's placed. The main purpose of this project is to analyses the static and dynamic impact of UPFC in transmission line. There have two software that used in this project which are MATLAB and PSCAD/EMTDC software. The MATLAB software used to get the data that can be used to model load flow by using PSCAD/EMTDC software. This modeling is called the steady state model (static). The model in PSCAD used to analyses the impact of UPFC in electric transmission line. For dynamic analyses, the model in steady state condition will apply fault. The analysis for the system is made and then the UPFC is applying to the system and the result will be analyzed. In this project the optimum location for placement of UPFC also has been discuss details. The simulation results show that the UPFC can control the active power, reactive power and the bus voltage which connected to UPFC.

Download or read book Modeling and Control of the Hybrid Power Flow Controller for Steady state and Dynamic Studies and Applications written by Behnam Tamimi and published by . This book was released on 2017 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flexible ac transmission system (FACTS) controllers offer new opportunities to better control power systems, and can address some of the critical challenges faced by the grid, especially in the context of smart grids. Furthermore, the smartening of distribution systems with distributed generation, storage devices, and intelligent loads have created challenges for the operation of distribution feeders, which can be addressed adequately with power-electronics based controllers and FACTS controllers for distribution systems. However, the capital intensive nature of these controllers is a major obstacle for a wide application of this technology in power systems. A cost effective FACTS controller has been introduced in the literature, which yields operating characteristics similar to those of the versatile Unified Power Flow Controller (UPFC). This device consists of converters as well as passive components, and is referred to as the Hybrid Power Flow Controller (HPFC). The study of the HPFC and its performance in electric power systems requires adequate and relevant models representing the device behavior according to the intended studies, such as steady state or time-domain dynamic analyses; moreover, the benefits of an HPFC are determined by its limits and operating constraints. Therefore, static and dynamic models of the HPFC for transmission and distribution system applications are proposed and studied in this work. First, steady-state models of the HPFC for power flow and optimal power flow (OPF) studies are proposed in this work, considering its multiple control modes and operating constraints. Thus, a strategy for control limit handling in power flow calculations is proposed, while considering a discrete passive shunt capacitor bank in the device. Moreover, an OPF model of the device is proposed and explained in detail, representing all the device control and physical limits as constraints in the mathematical formulation, so that the HPFC can be optimally dispatched as a part of the transmission system control assets; this model is used to determine the optimal ratings of the device based on a cost--benefit analysis. The proposed power flow and OPF models are tested and validated based on several loadability studies on a two-area benchmark test system. The HPFC power flow model is also tested and applied to a detailed model of Ontario grid and its neighboring networks with more than 6000 buses. The analyses demonstrate the application of the models for planning and operation studies, evaluating the performance and the effectiveness of the device based on realistic studies and scenarios. Second, the merits and the added value of the HPFC application to distribution systems are discussed here through detailed modeling and time-domain simulations, examining its impact on a distribution network under different conditions. Thus, a detailed dynamic representation of the HPFC is developed and implemented in PSCAD/EMTDC, describing and proposing control strategies to properly operate this controller in distribution system applications, such as an effective and simple procedure for starting-up the device. The developed model is used to demonstrate the effectiveness of the controller for solving problems in distribution systems, such as voltage sags associated with feeder faults and power flow fluctuations due to intermittent renewable generation using a benchmark network as an illustrative example.

Download or read book Design and Simulation of Unified Power Flow Controller with Grid Storage written by Christopher Beaudoin and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Power flow between two transmission systems across an uncontrolled interface can be problematic if there is unequal sharing between the tie lines. System configuration changes such as generation dispatch, or out of service elements can cause thermal overloads. In addition, some weaker areas of the system which may have insufficient transmission can have difficultly supporting the voltage at buses with high loading particularly after the loss of one element. This thesis presents a real transmission system which has two problems: a thermal limitation caused by unequal tie-sharing across an uncontrolled interface, and a post-fault voltage stability concern. Various potential solutions are analyzed and shown to address one or the other of these two problems; none of which were capable of solving both. A Unified Power Flow Controller (UPFC) is proposed which can effectively address both problems and can provide additional benefit in the form of a grid storage interface. The operational characteristics of a UPFC are analyzed and used to develop an electrical model and control system topology. The model with its control system is implemented in PSCAD. The UPFC is proven to be capable of effectively addressing the thermal limitation and voltage stability issues of the system. Further, a battery is added to the UPFC to provide grid energy storage. Cost saving measures through controller design are also proposed and implemented. This work demonstrates that a UPFC can be an effective solution to typical problems (such as thermal and voltage constraints) faced by a transmission system. A UPFC with grid storage can also provide an alternative to building costly transmission lines or generation by enhancing reliability, reducing demand on generation cause by system peaks, smoothing intermittent generation, etc.

Download or read book Modeling Simulation and Control of a Medium Scale Power System written by Tharangika Bambaravanage and published by Springer. This book was released on 2017-10-17 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights the most important aspects of mathematical modeling, computer simulation, and control of medium-scale power systems. It discusses a number of practical examples based on Sri Lanka’s power system, one characterized by comparatively high degrees of variability and uncertainty. Recently introduced concepts such as controlled disintegration to maintain grid stability are discussed and studied using simulations of practical scenarios. Power systems are complex, geographically distributed, dynamical systems with numerous interconnections between neighboring systems. Further, they often comprise a generation mix that includes hydro, thermal, combined cycle, and intermittent renewable plants, as well as considerably extended transmission lines. Hence, the detailed analysis of their transient behaviors in the presence of disturbances is both highly theory-intensive and challenging in practice. Effectively regulating and controlling power system behavior to ensure consistent service quality and transient stability requires the use of various schemes and systems. The book’s initial chapters detail the fundamentals of power systems; in turn, system modeling and simulation results using Power Systems Computer Aided Design/Electromagnetic Transients including DC (PSCAD/EMTDC) software are presented and compared with available real-world data. Lastly, the book uses computer simulation studies under a variety of practical contingency scenarios to compare several under-frequency load-shedding schemes. Given the breadth and depth of its coverage, it offers a truly unique resource on the management of medium-scale power systems.

Download or read book Modeling and Control Coordination of Power Systems with FACTS Devices in Steady state Operating Mode written by Nguyẽ̂n Văn Liêm and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is devoted to the development of new models for a recently-implemented FACTS (flexible alternating current transmission system) device, the unified power flow controller (UPFC), and the control coordination of power systems with FACTS devices in steady-state operating mode. The key objectives of the research reported in the thesis are, through online control coordination based on the models of power systems having FACTS devices, those of maximising the network operational benefit and restoring system static security following a disturbance or contingency. Based on the novel concept of interpreting the updated voltage solutions at each iteration in the Newton-Raphson (NR) power-flow analysis as dynamic variables, the thesis first develops a procedure for representing the unified power flow controllers (UPFCs) in the steady-state evaluation. Both the shunt converter and series converter control systems of a UPFC are modeled in their dynamical form with the discrete time variable replaced by the NR iterative step in the power-flow analysis. The key advantage of the model developed is that of facilitating the process of UPFC constraint resolution during the NR solution sequence. Any relative priority in control functions pre-set in the UPFC controllers is automatically represented in the power-flow formulation. Although the developed UPFC model based on the dynamic simulation of series and shunt converter controllers is flexible and general, the number of NR iterations required for convergence can be large. Therefore, the model is suitable mainly for power system planning and design studies. For online control coordination, the thesis develops the second UPFC model based on nodal voltages. The model retains all of the flexibility and generality of the dynamic simulation-based approach while the number of iterations required for solution convergence is independent of the UPFC controller dynamic responses. Drawing on the constrained optimisation based on Newton s method together with the new UPFC model expressed in terms of nodal voltages, a systematic and general method for determining optimal reference inputs to UPFCs in steady-state operation is developed. The method is directly applicable to UPFCs operation with a high-level line optimisation control (LOC) for maximising the network operational benefit. By using a new continuation technique with adaptive parameter, the algorithm for solving the constrained optimisation problem extends substantially the region of convergence achieved with the conventional Newton s method. Having established the foundation provided by the comprehensive models developed for representing power systems with FACTS devices including the UPFC, the research, in the second part, focuses on real-time control coordination of power system controllers, with the main purpose of restoring power system static security following a disturbance or contingency. At present, as the cost of phasor measurement units (PMUs) and wide-area communication network is on the decrease, the research proposes and develops a new secondary voltage control where voltages at all of the load nodes are directly controlled, using measured voltages.

Download or read book Conference Papers from the Summer Meeting written by IEEE Power Engineering Society and published by . This book was released on 2000 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laboratory Implementation of Unified Power Flow Controller Hardware in loop Simulation written by Keyou Wang and published by . This book was released on 2008 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: "One of the most promising network controllers for the bulk power system is the family of power electronics-based controllers, known as "flexible AC transmission system" (FACTS) devices. FACTS devices work by modifying power flow in individual lines of the power grid, maintaining voltage stability, and damping oscillations. The rapid development of the power electronics industry has made FACTS devices increasingly attractive for utility deployment due to their flexibility and ability to effectively control power system dynamics. The primary function of the FACTS is to control the transmission line power flow; the secondary functions of the FACTS can be voltage control, transient stability improvement and oscillation damping. Although considerable FACTS research work has concentrated on developing control strategies via simulation, there is a general lack of experimental verification of many of the proposed controls. In order to fully understand how to effectively incorporate FACTS devices into existing power systems, a hardware prototype for verification is necessary in addition to software simulation. Experimental studies provide valuable data to evaluate models, test proposed control algorithms, and analyze dynamic performance. Furthermore, experimental studies provide the basis with which to predict the device performance in the actual power system operation. Traditional software-based simulation has the disadvantage of being unable to exactly replicate real operational conditions. On the other hand, a small laboratory power system is not capable of fully capturing the depth and breadth of large-scale power system dynamics. One way to bridge the gap between simulation and real conditions is to combine real-time simulation (RTS) and hardware-in-the-loop (HIL). The contribution of this work is the development of the hardware-software co-design process required to successfully implement the FIL"--Abstract, leaves iii-iv.

Download or read book VSC FACTS HVDC written by Enrique Acha and published by John Wiley & Sons. This book was released on 2019-04-01 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Optimal Control Schemes for Power System with Unified Power Flow Controller UPFC written by Dr. Hidaia Mahmood Alassouli and published by Dr. Hidaia Mahmood Alassouli. This book was released on 2021-04-18 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: FACTS are one aspect of power electronics revolution that is taking place in all areas of electrical energy. A variable of powerful semiconductor devices not only offer the advantage of high speed and reliability of switching but, more importantly, the opportunity offered by a variety of innovative circuit concepts based on these power devices enhance the value of electric energy. In generation area, the potential application of power electronics is largely in renewable generation. Photovoltaic and fuel cells requires conversion of dc to ac. Generation with variable speed is necessary for economic viability of wind and small hydro generators. Variable-speed wind generators and small hydro generators requires conversion of variable frequency ac to power system frequency. These applications of power electronics in renewable generation area require converter sizes in the range of few kilowatts to few megawatts. In coming decades, electrical energy storage is expected to be widely used in power systems as capacitor, battery and superconducting magnet technologies move forward. Batteries are widely used already for emergency power supplies. These require ac/dc/ac converters in the range of a few kilowatts to a few tens of megawatts. On the other hand, variable speed hydro storage requires converters of up to a few hundred megawatts. In transmission area, application of power electronics consists of High Voltage Direct Current (HVDC) power transmission and FACTS. HVDC is often an economical way to interconnect certain power systems, which are suited in different regions separated by long distances or those have different frequencies or incompatible frequency control. HVDC involves conversion of ac to dc at one end and conversion of dc to ac at the other end. What is most interesting for transmission planners is that FACTS opens up new opportunities for controlling power and enhancing the usable capacity of the lines. The possibility that current through a line can be controlled at reasonable cost enables a large potential of increasing the capacity of the existing lines with larger conductors, and use one of the FACTS controllers to enable corresponding power to flow through lines under normal and contingency conditions. These opportunities arise through the ability of FACTS controllers to control the interrelated parameters that govern the operation of transmission line including series impedance, shunt impedance, current, voltage, phase angle, and the damping of oscillations at various frequencies below the rated frequency. In distribution area, an exciting opportunity called Custom Power. The custom power concept incorporates power electronics controllers and switching equipment, one or more of which can be used to provide a value-added service to the customers. In general, these custom service applications represent power electronics in the range of few tens of kilowatts to few ten of megawatts of conversion or switching equipment between the utility supply and customer. On the end-user side, power electronics conversion and switching technology has been fast growing area. Complementing the Custom Power technology is the whole area of power conditioning technology used by customers, under the term Power Quality. Uninterruptible power supplies (UPS) and voltage regulators represent the major growth area in power electronics. In end use, the converter sizes range from a few watts to ten of megawatts. The term active filter is a general one and is applied to a group of power electronic circuits incorporating power switching devices and passive energy storage circuit elements such as inductors and capacitors. The functions of these circuits vary depending on the applications. They are generally used for controlling current harmonics in supply networks at the low and medium voltage distribution level or for reactive power and/or voltage control at high voltage distribution level. These functions may be combined in a single circuit or in separate active filters. Most of the control schemes introduced in the existing papers were designed either for eliminating current harmonics or eliminating voltage flickers or for load flow control. So, this work is devoted to find a proper optimal control schemes for a system with series or shunt or series and shunt converters that can provide all functions together. Various optimal control schemes will be designed for systems with series, shunt and series-shunt converters with the objective to control the load flow through a lines and to eliminate current harmonics and voltage flickers with different strategies for tracking. · Part 1: Gives the description of optimal control design. · Part 2: Case studies to design different optimal control schemes for system with UPFC unit to control the power flow, eliminate voltage flicker and eliminate current harmonics. The case studies were repeated for system with only series or shunt converters.

Download or read book Introduction to FACTS Controllers written by Kalyan K. Sen and published by John Wiley & Sons. This book was released on 2009-10-13 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Demystifies FACTS controllers, offering solutions to power control and power flow problems Flexible alternating current transmission systems (FACTS) controllers represent one of the most important technological advances in recent years, both enhancing controllability and increasing power transfer capacity of electric power transmission networks. This timely publication serves as an applications manual, offering readers clear instructions on how to model, design, build, evaluate, and install FACTS controllers. Authors Kalyan Sen and Mey Ling Sen share their two decades of experience in FACTS controller research and implementation, including their own pioneering FACTS design breakthroughs. Readers gain a solid foundation in all aspects of FACTS controllers, including: Basic underlying theories Step-by-step evolution of FACTS controller development Guidelines for selecting the right FACTS controller Sample computer simulations in EMTP programming language Key differences in modeling such FACTS controllers as the voltage regulating transformer, phase angle regulator, and unified power flow controller Modeling techniques and control implementations for the three basic VSC-based FACTS controllers—STATCOM, SSSC, and UPFC In addition, the book describes a new type of FACTS controller, the Sen Transformer, which is based on technology developed by the authors. An appendix presents all the sample models that are discussed in the book, and the accompanying FTP site offers many more downloadable sample models as well as the full-color photographs that appear throughout the book. This book is essential reading for practitioners and students of power engineering around the world, offering viable solutions to the increasing problems of grid congestion and power flow limitations in electric power transmission systems.

Download or read book Optimal Placement of Unified Power Flow Controller by Dynamic Implementation of System Variable Based Voltage Stability Indices to Enhance Voltage Stability written by Shameem Ahmad and published by . This book was released on 2015 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new approach of unified power flow controller (UPFC) optimal placement in the power system network based on dynamic analysis of voltage stability is presented in this paper. Voltage stability indices (VSIs), called line stability index LQP, voltage collapse point indicators (VCPIs), and line stability factor Lmn have been employed to explore the most suitable location for UPFC. The locations of UPFC are identified by dynamically varying loads across all the PQ buses by different percentages to satisfy the real power system conditions. The simulations are conducted in a power system computer-aided design (PSCAD) environment where IEEE-39 bus system has been chosen as case study. The effectiveness of the proposed method has been ensured from the simulation results because UPFC's placement in the obtained locations resulted in an improved voltage stability condition. Furthermore, to verify the suitability of the explored locations, a comparative study has been conducted after placing UPFC in the present locations and other locations obtained using optimization techniques like particle swarm optimization (PSO), differential evolution (DE), genetic algorithm (GA), and bacteria foraging algorithm (BFA). In all the cases, UPFC's placement in the identified locations using the proposed approach has resulted in better voltage stability condition improvement compared to heuristics approaches.

Download or read book Intelligent Techniques and Applications in Science and Technology written by Subhojit Dawn and published by Springer Nature. This book was released on 2020-03-02 with total page 1126 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides innovative ideas on achieving sustainable development and using green technologies to conserve our ecosystem. Innovation is the successful exploitation of a new idea. Through innovation, we can achieve MORE while using LESS. Innovations in science & technology will not only help mankind as a whole, but also contribute to the economic growth of individual countries. It is essential that the global problem of environmental degradation be addressed immediately, and thus, we need to rethink the concept of sustainable development. Indeed, new environmentally friendly technologies are fundamental to attaining sustainable development. The book shares a wealth of innovative green technological ideas on how to preserve and improve the quality of the environment, and how to establish a more resource-efficient and sustainable society. The book provides an interdisciplinary approach to addressing various technical issues and capitalizing on advances in computing & optimization for scientific & technological development, smart information, communication, bio-monitoring, smart cities, food quality assessment, waste management, environmental aspects, alternative energies, sustainable infrastructure development, etc. In short, it offers valuable information and insights for budding engineers, researchers, upcoming young minds and industry professionals, promoting awareness for recent advances in the various fields mentioned above.

Download or read book Modeling and Control of the Unified Power Flow Controller UPFC written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: