Download or read book Risk Based Assessment of Subsynchronous Resonance in AC DC Systems written by Atia Adrees and published by Springer. This book was released on 2016-10-04 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: This relevant and timely thesis presents the pioneering use of risk-based assessment tools to analyse the interaction between electrical and mechanical systems in mixed AC/DC power networks at subsynchronous frequencies. It also discusses assessing the effect of uncertainties in the mechanical parameters of a turbine generator on SSR in a meshed network with both symmetrical and asymmetrical compensation systems. The research presented has resulted in 12 publications including three top international journal papers (IEEE Transactions on Power Systems) and nine international conference publications, including two award-winning papers.
Download or read book Recent Advances in Renewable Energy Automation and Energy Forecasting written by Sarat Kumar Sahoo and published by Frontiers Media SA. This book was released on 2023-12-08 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advancement of sustainable energy is becoming an important concern for many countries. The traditional electrical grid supports only one-way interaction of power being delivered to the consumers. The emergence of improved sensors, actuators, and automation technologies has consequently improved the control, monitoring and communication techniques within the energy sector, including the Smart Grid system. With the support of the aforementioned modern technologies, the information flows in two-ways between the consumer and supplier. This data communication helps the supplier in overcoming challenges like integration of renewable technologies, management of energy demand, load automation and control. Renewable energy (RE) is intermittent in nature and therefore difficult to predict. The accurate RE forecasting is very essential to improve the power system operations. The forecasting models are based on complex function combinations that include seasonality, fluctuation, and dynamic nonlinearity. The advanced intelligent computing algorithms for forecasting should consider the proper parameter determinations for achieving optimization. For this we need, new generation research areas like Machine learning (ML), and Artificial Intelligence (AI) to enable the efficient integration of distributed and renewable generation at large scale and at all voltage levels. The modern research in the above areas will improve the efficiency, reliability and sustainability in the Smart grid.
Download or read book An Investigation of Subsynchronous Oscillation of AC DC Power Systems written by Chang Yu and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "An investigation of subsynchronous oscillation of AC/DC power systems: modeling and analysis" by Chang, Yu, 余暢, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled "An Investigation of Subsynchronous Oscillation of AC/DC Power Systems: Modeling and Analysis" Submitted by Yu Chang for the degree of Doctor of Philosophy at The University of Hong Kong in July 2006 Subsynchronous Oscillation (SSO), which can result from torsional interactions with series compensation capacitors and/or various fast acting power system controllers, is a complex stability issue in power systems. The development of HVDC transmission and thyristor switching devices in power systems has stimulated considerable research into device-dependent SSO. This thesis seeks to present comprehensive mathematical models and small signal stability analysis of SSO in ac/dc power systems. Both eigenvalue analysis and complex torque coefficient (CTC) calculation methods are discussed. Traditional eigenvalue analysis is implemented based on system linearized ordinary differential equation (LODE) models with algebraic variables eliminated. However, the system physical transparency laid in the original differential and algebraic equations (DAE) can be destroyed after reduction. In addition, it may be inconvenient to conduct eigenvalue sensitivity analysis w.r.t. certain parameters based on LODE models. This thesis proposes linearized differential and algebraic equation (LDAE) models for SSO study. The DAE formulation process facilitates equation assembly efficiently by breaking down the modeling issue into tow steps, viz. element modeling and system integration. Both generalized eigenvalue analysis and CTC calculation methods are derived directly based on the proposed LDAE model. The LDAE-based SSO study model and its corresponding analysis methods have the potential to jointly work with appropriate thyristor switching device models for SSO study and provide deep insight about their effects on SSO. For SSO study in a power system with thyristor-switching devices, the time variations and nonlinearities caused by the switching transients pose a challenge to the eigenvalue analysis and CTC calculation methods. The quasi-steady-state models of converter-based thyristor-switching devices such as HVDC converters are widely used to investigate their impacts on SSO. The quasi-steady-state model with the switching transients ignored, theoretically, is accurate only for the fundamental component at the steady state. So far this approach has not yet been verified. This thesis reports a comprehensive study of the dynamic modeling of a generator/rectifier system, using the modeling technique in power electronics. A nonlinear detailed model of the electromechanical ac/dc system was constructed, based on the description of the commutation and non-commutation stages with the switching transients modeled in detail. In order to use the CTC calculation method to analyze SSO with impacts of rectifier controls, a precisely linearized model is derived by calculating the transition from the begin to the end of the period with piecewise accurate linearized system models. The computer case studies reported in this thesis show that the conventional quasi-steady-state model will result in more conservative simulation results than those from the proposed precisely linearized model. Hence SSO damping controllers designed from the quasi-steady-state model have to posses more control energy to retain system stability under SSO. Finally a stand
Download or read book Sub synchronous Resonance Analysis and Detection written by Igor Brandão Machado Matsuo and published by . This book was released on 2021 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the increasing penetration of renewable generation resources, power grids have become more susceptible to sub-synchronous resonance phenomena, especially to sub-synchronous control interaction, which produces fast-growing oscillations. The power system operation requirements for a reliable, fast and accurate detection and monitoring system for protection and mitigation purposes are increasing. Besides, risk assessment analysis during grid planning and update studies can be extremely time consuming due to a large number of possible grid configurations and small time-steps required for the simulation of detailed electromagnetic transient (EMT) models. The first part of this dissertation aims to provide an optimized tool for SSR risk assessment analysis based on frequency scanning that uses a multi-frequency signal to estimate the grid impedance at all frequencies with one simulation instead of one simulation per frequency of interest. The technique reduces the effects of nonlinearities normally present in power electronic-based devices, is based on the harmonic injection method and can be used with black-box models. A case study based on the Texas synthetic grid and with two wind farms and a VSC-based STATCOM was used for the validation of the proposed method, which showed superior accuracy than other studied techniques while being 11.71 times faster than multiple single-frequency injections. The second part of this dissertation provides an SSR detection system based on the power spectrum of the input signal plus frequency, magnitude, and derivative-of-magnitude estimators. All the signal conditioning techniques were also discussed and optimized to enable the detection system to efficiently and accurately work throughout the whole sub-synchronous range (5-55 Hz for a 60 Hz system). Finally, a complete monitoring system from data acquisition to data logging was implemented for the detection system in an FPGA-CPU heterogeneous platform and tested in real-time devices. The system provides several mechanisms to ensure its own reliable operation with several self-monitoring schemes and a health indicator in a dual modular redundancy scheme (primary and backup controller-units). A soft ware-implemented voting scheme then decides which unit will forward all information to the subsystems that will use the output of the detection system. The Texas synthetic grid case was applied to the monitoring/detection system and the detection of sub-synchronous control interaction was observed with pickup times within 10 ms to 40 ms depending on the system disturbance.
Download or read book Energy a Continuing Bibliography with Indexes written by and published by . This book was released on 1981 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Smart Grid and Renewable Energy written by Karma Sonam Sherpa and published by Springer Nature. This book was released on 2021-01-04 with total page 753 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises select proceedings of the international conference ETAEERE 2020, and primarily focuses on renewable energy resources and smart grid technologies. The book provides valuable information on the technology and design of power grid integration on microgrids of green energy sources. Some of the topics covered include solar PV array, hybrid microgrid, daylight harvesting, green computing, photovoltaic applications, nanogrid applications, AC/DC/AC converter for wind energy systems, solar photovoltaic panels, PEM fuel cell system, and biogas run dual-fueled diesel engine. The contents of this book will be useful for researchers and practitioners working in the areas of smart grids and renewable energy generation, distribution, and management.
Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 2304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to IEEE Publications written by Institute of Electrical and Electronics Engineers and published by . This book was released on 1980 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues for 1973- cover the entire IEEE technical literature.
Download or read book Science Abstracts written by and published by . This book was released on 1993 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Systems and Human Science For Safety Security and Dependability written by Robotics Society of Japan and published by Elsevier. This book was released on 2005-03-08 with total page 567 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiple participant decision making in societal and technological systems / K.W. Hipel and L. Fang -- Mathematical modeling for coping with uncertainty and risk / Marek Makowski -- Managing complex and dynamic systems for the future / E.D. Jones -- Characteristics of visual attention and the safety / T. Miura, K. Shinohara, T. Kimura and K. Ishimatsu -- An agent-based rules discovery from complex database / Mina Ryoke and Yoshiteru Nakamori -- Additional learning in computational intelligence and its applications to risk management problems / H. Nakayama, K. Kuramoto, M. Arakawa and K. Furukawa -- Integrated assessment of global warming stabilization scenarios by the Asia-Pacific integrated model / Toshihiko Masui, Kiyoshi Takahashi, Mikiko Kainuma and Yuzuru Matsuoka -- Trust and acceptance of risks / Satoshi Fujii, Toshiko Kikkawa and Kazuhisa Takemura -- A value judgment for evaluating the sense of security provided by nursing care robots based on cumulative prospect theory / Hiroy ...
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1989 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chronic Illness Care written by Timothy P. Daaleman and published by Springer Nature. This book was released on 2023 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of this popular textbook provides a comprehensive overview to chronic illness care, which is the coordinated, comprehensive and sustained response to chronic diseases and conditions by health care providers, formal and informal caregivers, healthcare systems, and community-based resources. This unique resource uses an ecological framework to frame chronic illness care at multiple levels, and includes sections on individual influences, the role of family and community networks, social and environmental determinants, and health policy. The book also orients how chronic care is provided across the spectrum of health care settings, from home to clinic, from the emergency department to the hospital and from hospitals to residential care facilities. The fully revised and expanded edition of Chronic Illness Care describes the operational frameworks and strategies that are needed to meet the care needs of chronically ill patients, including behavioral health, care management, transitions of care, and health information technology. It also addresses the changing workforce needs in health care and the fiscal models and policies that are associated with chronic care. Several new chapters are included in the second edition and reflect the significant changes that have occurred in health care due to the COVID-19 pandemic. Chapters covering vaccinations, virtual care, and care of COVID-19 associated chronic conditions have been added. The revised textbook builds on the first editions content that covered providing care to special population groups, such as children and adolescents, older adults, and adults with intellectual and developmental disabilities, by including care approaches to adults with severe and persistent mental health disorders, the LGBTQ+ community, incarcerated persons, immigrants and refugees, and military veterans. Finally, chapters on important and emerging topics, such as natural language processing and health inequities and structural racism have also been added.
Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 1998 with total page 922 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theses on any subject submitted by the academic libraries in the UK and Ireland.
Download or read book Conference Papers Index written by and published by . This book was released on 1987 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monthly. Papers presented at recent meeting held all over the world by scientific, technical, engineering and medical groups. Sources are meeting programs and abstract publications, as well as questionnaires. Arranged under 17 subject sections, 7 of direct interest to the life scientist. Full programs of meetings listed under sections. Entry gives citation number, paper title, name, mailing address, and any ordering number assigned. Quarterly and annual indexes to subjects, authors, and programs (not available in monthly issues).
Download or read book EPA Publications Bibliography written by United States. Environmental Protection Agency and published by . This book was released on 1995 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Department of Defense Dictionary of Military and Associated Terms written by and published by . This book was released on 1994 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
