Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 83 for “"Voltage stability"”.
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Optimal voltage stability assessment based on voltage stability indices and artificial neural network
The evaluation of voltage stability assessment experiences sizeable anxiety in the safe operation of power systems, due to the complications of a strain power system. With the snowballing of power demand by the consumers and also the restricted amount of power sources, therefore, the system has to …
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Effect of DERs on the Voltage Stability of Transmission Systems using a Voltage Stability Index
… focuses on the impact on a transmission system's voltage stability. When the voltage stability at a point in the system is compromised, it can affect the entire power system's overall security, quality, and reliability. Therefore, this work aims to assess the system's stress due to increased …
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Qualitative insights into the voltage stability problem
… some of the bus indicators for the problem of voltage stability. The purpose is to learn more about the behavior and to observe the factors that cause mis-ranking in estimating the stability margin. Three indicators are examined, the L-index, the coupled-port method, and the P-index. it found …
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Voltage Stability Analysis Using Simulated Synchrophasor Measurements
… under stressed conditions, which are close to instability limits. Operating power systems under such conditions along with inadequate reactive power reserves initiates a sequence of voltage instability points and can ultimately lead to a system voltage collapse. Significant research have been …
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Control of voltage stability on EHV power systems
… systems following severe disturbances leading to voltage stability are occurring with increasing frequency throughout the world. From an analysis of reported incidents, four distinct types of voltage instability have been identified: (1) Classic System Voltage Instability; (2) Transient System …
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Voltage stability analysis and control in power systems
Under the title of Voltage Stability Analysis and Control, three major subjects have been examined in this PhD project: the fundamental study of voltage stability, the on-line prediction method for voltage collapse, and secondary voltage control systems. The fundamental study was aimed to lay a …
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Design of Low-Frequency acGIC Voltage Stability Laboratory Protocol
… problems ranging from transformer overheating to voltage instability. There have been extensive studies on the effects of GICs, particularly on power transformers as they are the power systems' most susceptible components to GICs. The effects on transformers then affect the rest of the power …
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The impact of wind generation on power system voltage stability
… power system operation and planning in terms of voltage stability. Also, power flow pattern and system's dynamic characteristics change when large percentages of wind generation are connected to the grid. Wind generation is characterised by its variability and intermittency, and as such present …
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Online Voltage Stability Monitoring and Control Using Limited Synchrophasor Measurements
… systems can be operated close to the verge of voltage instability. With the application of Phasor Measurement Units (PMUs), dispatchers are able to monitor long term voltage stability in a real time operational environment. This research addresses the critical issues by proposing three …
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Pattern Recognition of Power Systems Voltage Stability Using Real Time Simulations
The basic idea deals with detecting the voltage collapse ahead of time to provide the operators a lead time for remedial actions and for possible prevention of blackouts. To detect cases of voltage collapse, we shall create methods using pattern recognition in conjunction with real time simulation …
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Analysis, monitoring and control of voltage stability in electric power systems
… in this text concentrates on three aspects of voltage stability studies: analysis and determination of suitable proximity indicators, design of an effective real-time monitoring system, and determination of appropriate emergency control techniques. A simulation model of voltage collapse was …
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Pattern Recognition of Power System Voltage Stability using Statistical and Algorithmic Methods
… stresses the present transmission system and voltage stability becomes an important issue in this regard. Pattern recognition in conjunction with voltage stability analysis could be an effective tool to solve this problem</p> <p>In this thesis, a methodology to detect the voltage stability …
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Voltage Stability and Control in Autonomous Electric Power Systems with Variable Frequency
… various types of power electronic loads. The stability of these systems is a challenge due to the inherent nonlinearity of the circuits involved. Traditionally, the stability analysis in this type of power systems has been approached by means of small-signal methodology derived from the …
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Voltage stability analysis of a power system network comprising a nuclear power plant
… are defined as being a form of power system instability that can be brought about by a variety of abnormal network scenarios. The most common modes of failure are grouped under the term power system stability. In this dissertation, the different modes of power stability that can affect a …
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Development and application of a new voltage stability index for on-line monitoring and shedding
During the past decades, voltage instability was the reason behind several major blackouts worldwide. Continuous assessment of the system voltage stability is vital to ensure a secured operation of the system. Several voltage stability indicators have been proposed and used in an attempt to …
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Reactive power compensation, system and voltage stability of an industrial network with short circuit limiting coupler
… needs for reactive power compensation under voltage and transient stability conditions. A short circuit limiting coupler is designed and the transient and voltage stability studies are performed with a short circuit limiting coupler (SLC) applied at the two 132 kV incoming supply lines from …
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Preventive assessment and enhancement of power system voltage stability: an integrated approach of thermal and voltage security
… to the preventive assessment and enhancement of voltage stability and security in electric power systems. However, in the course of deriving all the proposed methods we have paid attention to keeping them compatible with the (more traditional) handling of thermal overloads, thereby providing a …
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A Physical Unclonable Function Based on Inter-Metal Layer Resistance Variations and an Evaluation of its Temperature and Voltage Stability
… in key electrical parameters, such as delay or voltage. PUFs are designed to reproduce a bitstring on demand and therefore eliminate the need for on-chip storage. In this dissertation, I propose a kind of PUF that measures resistance variations in inter-metal layers that define the power grid of …
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Design of secondary voltage and stability controls with multiple control objectives
… proposed research is to design a Decentralized Voltage/Stability Monitoring and Control System to counteract voltage violations and the impact of disturbances/contingencies on power system voltage stability. A decentralized voltage and stability control system is designed to coordinate the …
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