Download or read book Transient Stability Assessment of Power Systems With Uncertain Renewable Generation Preprint written by and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The transient stability of a power system depends heavily on its operational state at the moment of a fault. In systems where the penetration of renewable generation is significant, the dispatch of the conventional fleet of synchronous generators is uncertain at the time of dynamic security analysis. Hence, the assessment of transient stability requires the solution of a system of nonlinear ordinary differential equations with unknown initial conditions and inputs. To this end, we set forth a computational framework that relies on Taylor polynomials, where variables are associated with the level of renewable generation. This paper describes the details of the method and illustrates its application on a nine-bus test system.

Download or read book Transient Stability Constrained Optimal Power Flow with Renewable Energy Uncertainties written by Shiwei Xia and published by . This book was released on 2015 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Power System Transient Stability Analysis Using the Transient Energy Function Method written by Abdel-Azia Fouad and published by Pearson Education. This book was released on 1991-08-01 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book details the state of the art in the development and application of the transient energy function (TEF) method as a tool for power system transient stability assessment. It provides both the analytical foundations of the TEF method and the practical issues involved in the application of the method to analyze power systems. Of primary interest to electric utility engineers who need to understand and apply the technique, as well as engineers in research organizations involved in research and development projects on power system dynamics, and utility engineers interested in the use of the TEF method as a tool for dynamic security assessment.

Download or read book Transient Stability of Power Systems written by Mania Pavella and published by Springer Science & Business Media. This book was released on 2000-10-31 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three Belgian researchers (U. of Liege) look at one unified approach to on-line dynamic security assessment and control to enable a power system to withstand unexpected contingencies without experiencing voltage or transient instabilities. The problem has greatly increased since deregulation, when utilities are being operated much closer to their limits in order to generate private profit. Their approach is called Single Machine Equivalent, SIME to its friends, and is a hybrid direct-temporal method that processes information about the system behavior in order to get one-shot stability assessment in the same way as direct methods. Preventative SIME relies on time-domain programs to get information about simulated stability scenarios of anticipated contingencies, and emergency SIME uses real-time measurements that take into account the actual occurrence of a contingency. Annotation copyrighted by Book News, Inc., Portland, OR

Download or read book Robust Stability Assessment for Future Power Systems written by Hung Dinh Nguyen and published by . This book was released on 2018 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Loss of stability in electrical power systems may eventually lead to blackouts which, despite being rare, are extremely costly. However, ensuring system stability is a non-trivial task for several reasons. First, power grids, by nature, are complex nonlinear dynamical systems, so assessing and maintaining system stability is challenging mainly due to the co-existence of multiple equilibria and the lack of global stability. Second, the systems are subject to various sources of uncertainties. For example, the renewable energy injections may vary depending on the weather conditions. Unfortunately, existing security assessment may not be sufficient to verify system stability in the presence of such uncertainties. This thesis focuses on new scalable approaches for robust stability assessment applicable to three main types of stability, i.e., long-term voltage, transient, and small-signal stability. In the first part of this thesis, I develop a novel computationally tractable technique for constructing Optimal Power Flow (OPF) feasibility (convex) subsets. For any inner point of the subset, the power flow problem is guaranteed to have a feasible solution which satisfies all the operational constraints considered in the corresponding OPF. This inner approximation technique is developed based on Brouwer's fixed point theorem as the existence of a solution can be verified through a self-mapping condition. The self-mapping condition along with other operational constraints are incorporated in an optimization problem to find the largest feasible subsets. Such an optimization problem is nonlinear, but any feasible solution will correspond to a valid OPF feasibility estimation. Simulation results tested on several IEEE test cases up to 300 buses show that the estimation covers a substantial fraction of the true feasible set. Next, I introduce another inner approximation technique for estimating an attraction domain of a post-fault equilibrium based on contraction analysis. In particular, I construct a contraction region where the initial conditions are "forgotten", i.e., all trajectories starting from inside this region will exponentially converge to each other. An attraction basin is constructed by inscribing the largest ball in the contraction region. To verify contraction of a Differential-Algebraic Equation (DAE) system, I also show that one can rely on the analysis of extended virtual systems which are reducible to the original one. Moreover, the Jacobians of the synthetic systems can always be expressed in a linear form of state variables because any polynomial system has a quadratic representation. This makes the synthetic system analysis more appropriate for contraction region estimation in a large scale. In the final part of the thesis, I focus on small-signal stability assessment under load dynamic uncertainties. After introducing a generic impedance-based load model which can capture the uncertainty, I propose a new robust small signal (RSS) stability criterion. Semidefinite programming is used to find a structured Lyapunov matrix, and if it exists, the system is provably RSS stable. An important application of the criterion is to characterize operating regions which are safe from Hopf bifurcations. The robust stability assessment techniques developed in this thesis primarily address the needs of a system operator in electrical power systems. The results, however, can be naturally extended to other nonlinear dynamical systems that arise in different fields such as biology, biomedicine, economics, neuron networks, and optimization. As the robust assessment is based on sufficient conditions for stability, there is still room for development on reducing the inevitable conservatism. For example, for OPF feasibility region estimation, an important open question considers what tighter bounds on the nonlinear residual terms one can use instead of box type bounds. Also, for attraction basin problem, finding the optimal norms and metrics which result in the largest contraction domain is an interesting potential research question.

Download or read book Stability Analysis and Security Assessment in Uncertain Power System Models written by Ruxiang Qian and published by . This book was released on 1991 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Use of Voltage Stability Assessment and Transient Stability Assessment Tools in Grid Operations written by Sarma (NDR) Nuthalapati and published by Springer. This book was released on 2021-07-31 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together real-world accounts of using voltage stability assessment (VSA) and transient stability assessment (TSA) tools for grid management. Chapters are written by leading experts in the field who have used these tools to manage their grids and can provide readers with a unique and international perspective. Case studies and success stories are presented by those who have used these tools in the field, making this book a useful reference for different utilities worldwide that are looking into implementing these tools, as well as students and practicing engineers who are interested in learning the real-time applications of VSA and TSA for grid operation.

Download or read book Robust Stability Analysis for Large scale Power Systems written by Richard Yi Zhang and published by . This book was released on 2017 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Innovations in electric power systems, such as renewable energy, demand-side participation, and electric vehicles, are all expected to increase variability and uncertainty, making stability verification more challenging. This thesis extends the technique of robust stability analysis to large-scale electric power systems under uncertainty. In the first part of this thesis, we examine the use of the technique to solve real problems faced by grid operators. We present two case studies: small-signal stability for distributed renewables on the IEEE 118-bus test system, and large-signal stability for a microgrid system. In each case study, we show that robust stability analysis can be used to compute stability margins for entire collections of uncertain scenarios. In the second part of this thesis, we develop scalable algorithms to solve robust stability analysis problems on large-scale power systems. We use preconditioned iterative methods to solve the Newton direction computation in the interior-point method, in order to avoid the O(n6) time complexity associated with a dense-matrix approach. The per-iteration costs of the iterative methods are reduced to O(n3) through a hierarchical block-diagonal-plus-low-rank structure in the data matrices. We provide evidence that the methods converge to an [epsilon]-accurate solution in O(1=[square root of ] [epsilon]) iterations, and characterize two broad classes of problems for which the enhanced convergence is guaranteed.

Download or read book Power System Transient Stability Analysis Using the Transient Energy Function Method written by Abdel-Azia and published by . This book was released on 1991 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Power System Transient Stability Analysis Using the Transient Energy Function Method written by Fouad and published by . This book was released on 1991 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Uncovering the Predominant Factors Influencing the Transient Stability Margin in Power Systems with Increasing Renewable Generation Using Interpretable Machine Learning written by Robert Hamilton and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optimization of Power System Operation written by Jizhong Zhu and published by John Wiley & Sons. This book was released on 2016-12-08 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optimization of Power System Operation, 2nd Edition, offers a practical, hands-on guide to theoretical developments and to the application of advanced optimization methods to realistic electric power engineering problems. The book includes: New chapter on Application of Renewable Energy, and a new chapter on Operation of Smart Grid New topics include wheeling model, multi-area wheeling, and the total transfer capability computation in multiple areas Continues to provide engineers and academics with a complete picture of the optimization of techniques used in modern power system operation

Download or read book Transient Stability Assessment for Electrical Power Systems Using Reduced Order Multimachine Systems written by Etienne Bruls and published by . This book was released on 1993 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of Long term Stability Analysis of Power Systems with Renewable Energy written by Xiaozhe Wang and published by . This book was released on 2015 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the growing load demand and aging transmission networks, many power systems have been pushed ever closer to their stability limits. Furthermore, the increasing penetration of renewable energies and rapid development of the smart grids result in more stability concerns beyond the short-term time scale. All above factors highlight the significance to study the long-term stability analysis of power systems. This dissertation contributes to the long-term stability analysis of traditional power systems as well as the power grids with wind power by providing nonlinear analysis, establishing theoretical foundations, developing computational tools and implementing new numerical methods. The quasi steady-state (QSS) model was regarded as a competent model to provide accurate stability analysis with fast speed in long-term stability analysis. Our study, however, has shown that the QSS model may provide incorrect (over-optimistic) stability assessment. Hence, in this dissertation, limitations of the QSS model are comprehensively analyzed in a nonlinear system framework. A theoretical foundation for the QSS model is developed, which provides sufficient conditions under which the QSS model can provide accurate approximations for the long-term stability model in terms of trajectories and [omega]-limit set. Furthermore, two hybrid QSS models are proposed from the physical and the- oretical perspectives respectively, which are remedies to the QSS model. Each hybrid QSS model is provided with efficient numerical schemes for practical implementation, and the generic hybrid QSS model is also equipped with a theoretical basis to ensure consistently accurate approximations for the long-term stability model. Apart from the model development in long-term stability analysis, this dissertation also provides some numerical development. A theory-based numerical method, pseudo transient-continuation method, is improved and applied in long-term stability research to expedite simulation speed in the long-term stability model and overcome numerical difficulties in the QSS model. The work provides an alternative numerical method to the conventional integration methods in time domain simulation with good efficiency and stability properties. In addition, this dissertation involves long-term stability analysis of the power systems integrating wind power. A stochastic formulation of power system models incorporating wind power is presented based on stochastic differential equations, and a novel methodology to conduct stability analysis for these systems is developed with a theoretical foundation. The work may represent the first attempt to exploit the singular perturbation method for SDE in power system stability research.

Download or read book Assessment of Power System Transient Stability Using Energy Functions written by Baofu Gao and published by . This book was released on 1987 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Real Time Stability Assessment in Modern Power System Control Centers written by S. C. Savulescu and published by Wiley-IEEE Press. This book was released on 2009-02-12 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book answers the need for a practical, hands-on guide for assessing power stability in real time, rather than in offline simulations. Since the book is primarily geared toward the practical aspects of the subject, theoretical background is reduced to the strictest minimum. For the benefit of readers who may not be quite familiar with the underlying theoretical techniques, appendices describing key algorithms and theoretical issues are included at the end of the book. It is an excellent source for researchers, professionals, and advanced undergraduate and graduate students.

Download or read book Power System Transient Stability Assessment Using Transient Energy Function written by M. Belkacemi and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: