Download or read book Real time Identification and Monitoring of the Voltage Stability Margin in Electric Power Transmission Systems Using Synchronized Phasor Measurements written by Yves Narcisse Nguegan Tchokonte and published by kassel university press GmbH. This book was released on 2009 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Critical Information Infrastructures Security written by Christos G. Panayiotou and published by Springer. This book was released on 2016-03-24 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes revised selected papers from the 9th International Conference on Critical Information Infrastructures Security, CRITIS 2014, held in Limassol, Cyprus, in October 2014. The 20 full and 19 short papers presented in this volume were carefully reviewed and selected from 74 submissions. They are organized in topical sections named: cyber-physical systems and sensor networks; security of water systems; power and energy system security; security and recovery policies, cyber security; and security tools and protocols.

Download or read book Dynamic Vulnerability Assessment and Intelligent Control written by José Luis Rueda-Torres and published by John Wiley & Sons. This book was released on 2018-01-25 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Identifying, assessing, and mitigating electric power grid vulnerabilities is a growing focus in short-term operational planning of power systems. Through illustrated application, this important guide surveys state-of-the-art methodologies for the assessment and enhancement of power system security in short term operational planning and real-time operation. The methodologies employ advanced methods from probabilistic theory, data mining, artificial intelligence, and optimization, to provide knowledge-based support for monitoring, control (preventive and corrective), and decision making tasks. Key features: Introduces behavioural recognition in wide-area monitoring and security constrained optimal power flow for intelligent control and protection and optimal grid management. Provides in-depth understanding of risk-based reliability and security assessment, dynamic vulnerability assessment methods, supported by the underpinning mathematics. Develops expertise in mitigation techniques using intelligent protection and control, controlled islanding, model predictive control, multi-agent and distributed control systems Illustrates implementation in smart grid and self-healing applications with examples and real-world experience from the WAMPAC (Wide Area Monitoring Protection and Control) scheme. Dynamic Vulnerability Assessment and Intelligent Control for Power Systems is a valuable reference for postgraduate students and researchers in power system stability as well as practicing engineers working in power system dynamics, control, and network operation and planning.

Download or read book Modeling and Modern Control of Wind Power written by Qiuwei Wu and published by John Wiley & Sons. This book was released on 2018-02-05 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: An essential reference to the modeling techniques of wind turbine systems for the application of advanced control methods This book covers the modeling of wind power and application of modern control methods to the wind power control—specifically the models of type 3 and type 4 wind turbines. The modeling aspects will help readers to streamline the wind turbine and wind power plant modeling, and reduce the burden of power system simulations to investigate the impact of wind power on power systems. The use of modern control methods will help technology development, especially from the perspective of manufactures. Chapter coverage includes: status of wind power development, grid code requirements for wind power integration; modeling and control of doubly fed induction generator (DFIG) wind turbine generator (WTG); optimal control strategy for load reduction of full scale converter (FSC) WTG; clustering based WTG model linearization; adaptive control of wind turbines for maximum power point tracking (MPPT); distributed model predictive active power control of wind power plants and energy storage systems; model predictive voltage control of wind power plants; control of wind power plant clusters; and fault ride-through capability enhancement of VSC HVDC connected offshore wind power plants. Modeling and Modern Control of Wind Power also features tables, illustrations, case studies, and an appendix showing a selection of typical test systems and the code of adaptive and distributed model predictive control. Analyzes the developments in control methods for wind turbines (focusing on type 3 and type 4 wind turbines) Provides an overview of the latest changes in grid code requirements for wind power integration Reviews the operation characteristics of the FSC and DFIG WTG Presents production efficiency improvement of WTG under uncertainties and disturbances with adaptive control Deals with model predictive active and reactive power control of wind power plants Describes enhanced control of VSC HVDC connected offshore wind power plants Modeling and Modern Control of Wind Power is ideal for PhD students and researchers studying the field, but is also highly beneficial to engineers and transmission system operators (TSOs), wind turbine manufacturers, and consulting companies.

Download or read book Application of Smart Grid Technologies written by Lisa Lamont and published by Academic Press. This book was released on 2018-05-29 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: Application of Smart Grid Technologies: Case Studies in Saving Electricity in Different Parts of the World provides a wide international view of smart grid technologies and their implementation in all regions of the globe. A brief overview of smart grid concepts and state-of-the art technologies is followed by sections that highlight smart grid experiences in Asia, Africa, North America, South America, Europe and Australasia. Chapters address select countries or sub-regions, presenting their local technological needs and specificities, status of smart grid implementation, technologies of choice, impacts on their electricity markets, and future trends. Similar chapter makes it easier to compare these experiences. In a time when the smart grid is becoming a worldwide reality, this book is ideal for professionals in power transmission and distribution companies, as well as students and researchers in the same field. It is also useful for those involved in energy management and policymaking. Presents the status and challenges of smart grid technologies and their implementation around the globe Includes global case studies written by local experts and organized for easy comparison Provides a brief overview of smart grid concepts and currently available technologies

Download or read book Power System Stability and Control written by Leonard L. Grigsby and published by CRC Press. This book was released on 2017-12-19 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: With contributions from worldwide leaders in the field, Power System Stability and Control, Third Edition (part of the five-volume set, The Electric Power Engineering Handbook) updates coverage of recent developments and rapid technological growth in essential aspects of power systems. Edited by L.L. Grigsby, a respected and accomplished authority in power engineering, and section editors Miroslav Begovic, Prabha Kundur, and Bruce Wollenberg, this reference presents substantially new and revised content. Topics covered include: Power System Protection Power System Dynamics and Stability Power System Operation and Control This book provides a simplified overview of advances in international standards, practices, and technologies, such as small signal stability and power system oscillations, power system stability controls, and dynamic modeling of power systems. This resource will help readers achieve safe, economical, high-quality power delivery in a dynamic and demanding environment. With five new and 10 fully revised chapters, the book supplies a high level of detail and, more importantly, a tutorial style of writing and use of photographs and graphics to help the reader understand the material. New Chapters Cover: Systems Aspects of Large Blackouts Wide-Area Monitoring and Situational Awareness Assessment of Power System Stability and Dynamic Security Performance Wind Power Integration in Power Systems FACTS Devices A volume in the Electric Power Engineering Handbook, Third Edition. Other volumes in the set: K12642 Electric Power Generation, Transmission, and Distribution, Third Edition (ISBN: 9781439856284) K12648 Power Systems, Third Edition (ISBN: 9781439856338) K12650 Electric Power Substations Engineering, Third Edition (9781439856383) K12643 Electric Power Transformer Engineering, Third Edition (9781439856291)

Download or read book Synchrophasor Based Voltage Stability Monitoring and Control of Power Systems written by Saugata Swapan Biswas and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: With increasing loads, change in generation mix, environmental limitations on transmission system expansion and high competition amongst the power utilities, power systems are being pushed to voltage stability limits, thus increasing the chances of a voltage collapse that can lead to a blackout. Numerous voltage instability incidents occurring around the world in recent years have emphasized voltage stability studies during planning and operation of power systems. With the advent of synchrophasor technology, improved algorithms can be developed utilizing phasor measurements to efficiently monitor the voltage stability condition of a power system, thus enabling fast online control.

Download or read book Real time Voltage Stability Monitoring and Control for Load Areas written by Fengkai Hu and published by . This book was released on 2016 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation proposes a hybrid approach for real-time monitoring and controlling voltage stability of a load area fed by N tie lines. This hybrid approach integrates both simulation-based and measurement-based approaches for voltage stability assessment (VSA). First, for measurement-based VSA (MBVSA), a new method is proposed for monitoring and control of load areas, which adopts an N+1 buses equivalent system so as to model and monitor individual tie lines of a load area compared to a traditional MBVSA method adopting a Thevenin equivalent. For each tie line, the new method solves the power transfer limit against voltage instability analytically as a function of all parameters of that equivalent, which is online identified from real-time synchronized measurements on boundary buses of the load area. Thus, this new MBVSA method can directly calculate the real-time power transfer limit on each tie line. Second, in order to assess the voltage stability margins under an n-1 contingency, based on the proposed MBVSA method, two sensitivity analyses have been performed, which are respectively for the parameter sensitivity of the equivalent system and the sensitivity of the tie line flow under an n-1 contingency. Third, the proposed MBVSA method implemented for both the real-time condition and potential n-1 contingencies is integrated with the simulation-based VSA approach to form a hybrid approach. The MBVSA method helps reduce the computation burden by eliminating the unimportant contingencies while the simulation-based method provides accurate information for specific “what if” scenarios such as stability limit and margin indices under n-1 contingency conditions. In addition, simulation using the model of the system can provide recommendations for preventive control if potential voltage instability is identified. This proposed hybrid VSA approach has been validated on the NPCC (Northeast Power Coordinating Council) Large-scale Test Bed (LTB) system developed by the CURENT (Center for Ultra-Wide-Area Resilient Electric Energy Transmission Networks), and also implemented on the CURENT Hardware Test Bed (HTB) system. The effectiveness of the MBVSA in real-time monitoring and closed-loop control against voltage instability has been validated.

Download or read book A Study on Wide area Measurement based Approaches for Power System Voltage Stability written by Haoyu Yuan and published by . This book was released on 2016 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the development of wide-area monitoring system (WAMS) enabled by the synchrophasor technology, measurement-based approaches for power system voltage stability and control have been widely discussed in recent years. Based on high-frequency synchronized measurement signals collected from phasor measurement units (PMUs), these approaches have great potentials to significantly improve the situational awareness and to effectively guide the controls of interconnected modern power systems. If compared with conventional model-based voltage stability assessment (VSA) and control methods, the measurement-based methods are relatively new. Although their simplicity and independence of system models make them suitable for online deployment, the applications of these measurement-based methods are not as well explored as their model-based counterparts, which have been improved and matured over several decades. Therefore, the motivation of this dissertation is to explore new applications of measurement-based voltage stability assessment and control. In this dissertation, first, a comparative study on existing measurement-based approaches is provided; second, a hybrid VSA approach for N-1 contingency is proposed; third, measurement-based wide-area loading margin sensitivity suitable for voltage stability control is presented with a sample control study; fourth, mitigation approaches for overestimation of voltage stability margin when using coupled single-port circuit are proposed; and fifth, voltage dependent load model is integrated into measurement-based voltage stability analysis to provide a practical and accurate assessment of voltage stability margin.

Download or read book Real time Grid Reliability Management written by and published by . This book was released on 2008 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of an Improved On line Voltage Stability Index Using Synchronized Phasor Measurement written by Yanfeng Gong and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent events, such as the Northeast Blackout of 2003, have highlighted the need for accurate real-time stability assessment techniques to detect when an electric power system is on the brink of voltage collapse. While many techniques exist, most techniques are computationally demanding and cannot be used in an on-line application. A voltage stability index (VSI) can be designed to estimate the distance of the current operating point to the voltage marginally stable point during the system operation. In this research work, a new VSI was developed that not only can detect the system voltage marginally stable point but also is computationally efficient for on-line applications. Starting with deriving a method to predict three types of maximum transferable power of a single source power system, the new VSI is based on the three calculated load margins. In order to apply the VSI to large power systems, a method has been developed to simplify the large network behind a load bus into a single source and a single transmission line given the synchronized phasor measurements of the power system variables and network parameters. The simplified system model, to which the developed VSI can be applied, preserves the power flow and the voltage of the particular load bus. The proposed voltage stability assessment method, therefore, provides a VSI of each individual load bus and can identify the load bus that is the most vulnerable to voltage collapse. Finally, the new VSI was tested on three power systems. Results from these three test cases provided validation of the applicability and accuracy of the proposed VSI.

Download or read book Voltage Stability Assessment and Control Based on Synchrophasor Measurements in Ambient Condition written by Sayed Mohammad Amelian and published by . This book was released on 2019 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: Voltage stability assessment and control are among the top priority tasks for electric utilities and power system operators. Failure in performing these correctly, has resulted in some of the major blackouts over the past few decades. Continuous loading increase on system infrastructure, higher reliability and security requirements, as well as progressive renewable resource integration, incapable of guaranteeing sustained reactive support, have all made this function more complex, and yet more crucial.Traditionally, developed algorithms for calculating voltage stability margin and recommending the necessary control action, rely on complete and accurate system models, as well as extensive offline studies. Investigating previous incidents has proved this to be a challenging goal to achieve. At the same time, integration of high-sampling measurement devices such as synchrophasors, powerful processors, and fast communication have resulted in increased situational awareness and monitoring quality of the system behavior. As a result, there is high interest today, to develop measurement-based real-time tools for determining system status from stability point of view and deduce the optimal control actions in critical conditions.In this dissertation, accurate modeling of the power system ambient data, corresponding to its operation at quasi steady-state condition is discussed, and the difference between system's steady-state response and power flow solutions is investigated. Based on this clarification, a new distributed model-free algorithm is proposed for voltage stability assessment and control of a power system, based on steady-state Q-V sensitivity of system buses. This is realized through subspace system identification from input-output response based on ambient measurements. Once the sensitivities are known, system proximity to voltage instability can be determined using the minimum sensitivity, rank system buses according to their stability margin and the need for corrective control actions, and determine the optimal set of actions needed to bring system operation point back to a secure state. To pursue the latter, two optimization approaches with different objectives based on various operating policies are introduced towards finding the best local control action within a substation. Finally, an index is introduced to determine vulnerability of the system to voltage instability caused by limitation on a generator's reactive power.

Download or read book Wide Area Power Systems Stability Protection and Security written by Hassan Haes Alhelou and published by Springer Nature. This book was released on 2020-09-21 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book proposes new control and protection schemes to improve the overall stability and security of future wide-area power systems. It focuses on the high penetration levels of renewable energy sources and distributed generation, particularly with the trend towards smart grids. The control methods discussed can improve the overall stability in normal and abnormal operation conditions, while the protection methods presented can be used to ensure the secure operation of systems under most severe contingencies. Presenting stability, security, and protection methods for power systems in one concise volume, this book takes the reader on a journey from concepts and fundamentals to the latest and future trends in each topic covered, making it an informative and intriguing read for researchers, graduate students, and practitioners alike.

Download or read book Machine Learning Based Real time Monitoring of Long term Voltage Stability Using Voltage Stability Indices written by Kalana Dharmapala and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Voltage instability manifests as a progressive voltage drop leading to a voltage collapse. It has been associated with many recent blackouts occurred at various parts of the world. Ability to predict the proximity to voltage instability in real-time using measurements can improve the security of power systems. Among the various techniques that are available to assess the proximity to voltage instability of a power system, Voltage Stability Indices (VSIs) are the widely considered as suitable for generating real-time quantitative parameters that indicate the voltage security level. The majority of the VSIs are theoretically coherent at the proximity of the point of system voltage collapse where they reach some critical value. However, their ability to accurately indicate the voltage stability margin varies with power system operating conditions and under different contingencies: It becomes difficult for the system operators to differentiate voltage instabilities from normal operating conditions using simple rules such as thresholds. Loadability Margin (LM) is a direct representation of proximity to long-term voltage stability and it is also an easily understandable indicator of voltage stability. However, it is difficult to determine the LM of a large power system through direct computations in real-time. As a solution, a new machine learning based approach is suggested to predict the LM. The proposed technique uses different VSIs computed from synchrophasor measurements as inputs to several Machine Learning Models (MLMs) which forms an ensemble that collectively predict the LM. The VSIs used for each MLM is carefully chosen to include those based on different principles. A procedure that include automated training data generation, correlation based input feature selection, and performance based choice of machine learning algorithm is proposed to develop the proposed system. The studies conducted on the IEEE-14 and -118 bus systems showed that the Random Forest Regression gives the best performance in terms of the accuracy and robustness. The effects of practical aspects such as synchrophasor measurement errors on the LM prediction accuracy were analyzed. Finally, a real-time version of the proposed LM prediction system was implemented on PhasorSmart® synchrophasor application platform and was tested using the IEEE 14-bus system and phasor measurement units simulated on RTDS® real-time simulator.

Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1994 with total page 1084 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Efficient and Reliable Wide area Protection and Control Schemes for Electric Power Systems Based on Time synchronized Phasor Measurements written by Armando Guzman and published by . This book was released on 2015 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Voltage and current time-synchronized measurements, better known as synchrophasors, use an absolute time reference and can provide information of the state of the power system in real time. So far, typical synchrophasor applications have been limited to visualization and post-mortem analysis. This dissertation proposes four efficient and reliable synchrophasor-based protection and control applications for detecting ground faults in power lines and preventing power system disruptions. The work begins by recommending the quadrature demodulation method for estimating synchrophasors suitable for detecting power oscillations. The first proposed application is a system integrity protection scheme (SIPS) for automatic generation shedding based on estimation of the voltage angle difference between two areas of the power system. The proposed scheme combines phasor measurements, phasor data concentration, and control functionality in a single device to minimize components within a system and increase its reliability. The second application is a synchrophasor-based line differential protection scheme that complements primary distance protection schemes, provides backup protection, and does not require voltage information. A negative-sequence current differential element, together with total current faulted phase identification, detects high-resistance faults without compromising phase selectivity. An additional important benefit of this proposed approach is that communication channel delay asymmetry does not affect differential element operation resulting from use of time-stamped measurements. The third application proposes a power system dynamics monitor that includes out-of-step detection, power swing detection, and predictive out-of-step tripping algorithms. These synchrophasor-based algorithms allow the implementation of a SIPS that requires minimum network topology information and automatically adapts to changing operating conditions of the power system. The fourth application proposes a SIPS that performs modal analysis in real time, identifies inter-area power oscillations within the frequency band of interest, and takes remedial action if the signal amplitude exceeds a predefined threshold and the damping ratio is less than a predefined threshold for a predefined time. The proposed SIPS has proven effective in a field application and has prevented power system collapse on multiple occasions when inter-area power oscillations occurred. Throughout all four SIPSs this work proposes components have been kept to a minimum. This reduction in complexity makes these schemes more reliable.

Download or read book Power System Online Stability Assessment Using Synchrophasor Data Mining written by Ce Zheng and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Traditional power system stability assessment based on full model computation shows its drawbacks in real-time applications where fast variations are present at both demand side and supply side. This work presents the use of data mining techniques, in particular the Decision Trees (DTs), for fast evaluation of power system oscillatory stability and voltage stability from synchrophasor measurements. A regression tree-based approach is proposed to predict the stability margins. Modal analysis and continuation power flow are the tools used to build the knowledge base for off-line DT training. Corresponding metrics include the damping ratio of critical electromechanical oscillation mode and MW-distance to the voltage instability region. Classification trees are used to group an operating point into predefined stability state based on the value of corresponding stability indicator. A novel methodology for knowledge base creation has been elaborated to assure practical and sufficient training data. Encouraging results are obtained through performance examination. The robustness of the proposed predictor to measurement errors and system topological variations is analyzed. A scheme has been proposed to tackle the problem of when and how to update the data mining tool for seamless online stability monitoring. The optimal placement for the phasor measurement units (PMU) based on the importance of DT variables is suggested. A measurement-based voltage stability index is proposed and evaluated using field PMU measurements. It is later revised to evaluate the impact of wind generation on distribution system voltage stability. Next, a new data mining tool, the Probabilistic Collocation Method (PCM), is presented as a computationally efficient method to conduct the uncertainty analysis. As compared with the traditional Monte Carlo simulation method, the collocation method could provide a quite accurate approximation with fewer simulation runs. Finally, we show how to overcome the disadvantages of mode meters and ringdown analyzers by using DTs to directly map synchrophasor measurements to predefined oscillatory stability states. The proposed measurement-based approach is examined using synthetic data from simulations on IEEE test systems, and PMU measurements collected from field substations. Results indicate that the proposed method complements the traditional model-based approach, enhancing situational awareness of control center operators in real time stability monitoring and control. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/149456