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 15 of 15 for “"Electric power system stability"”.
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Effects of GIC Neutral Blocking Devices (NBDs) on transmission lines protection performance and potential for resonance
… current that may have adverse effects on power system reliability. Several GIC blocking device (NBDs) designs are available, but the majority is capacitive. Concerns have arisen about the effects of NBDs on distance-protection relays. To investigate their impact, real-time simulation (of …
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Control of voltage stability on EHV power systems
Collapses of power 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) …
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An exiplicit damping sensitivity expression for power system stabilizers applications in power systems
Interconnected power systems are subject to low frequency oscillations. These oscillations, if poorly damped, threaten the stability of the system and limit its power transfer capability. Power System Stabilizers (PSS) are widely used to enhance the damping of electromechanical oscillatory modes. …
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Investigation of a new method for synchronous generator loss of excitation protection
… loss of field can compromise both generator and power grid stability and therefore must be quickly detected. In this thesis, a new proposed method for LOF detection has been further explored and its shortcomings corrected.The detection index has been calculated based on these new modifications. …
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Automated detection and prediction of electrical disturbances in a power transmission system
As power quality becomes a higher priority in the electric utility industry, utilities simply do not have the required personnel to analyze the ever-growing amount of data by hand. This thesis presents an automated approach for the analysis of power quality phenomena within a power transmission …
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A two step predictor-corrector method for voltage collapse point estimation
Voltage Collapse is the system failure to obtain acceptable voltage levels in significant part of the power system, and it is often due to system failure to satisfy reactive power demand. Voltage Collapse can lead to blackout like the one occurred in 2003 in North America. Methods for on-line …
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Improved computations of the voltage collapse point using the P-index
Online voltage stability assessment of power system is important to ensure reliability and security. Over the years, many voltage monitoring indices have been documented in the literature. These indices are designed to quantify proximity to voltage collapse. However, they all have inaccuracies when …
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Impact of high penetration of PV generation on power system transient stability and fault current; modeling for real-time studies
The electric power system is currently experiencing a period of unprecedented changes in the technology of generation. Environmental and sustainability concerns led to replacement of a significant share of conventional thermal generation with renewable energy resources. This shift has raised major …
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Power system stabilizer design using out of phase torque correction method
The need for power system stabilizers (PSS) in interconnected power systems has become essential to damp low frequency oscillations and enhance the system stability. Conventional PSS design techniques utilize local measurements, hence allowing the use of single machine infinite bus method to tune …
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Qualitative insights into the voltage stability problem
… 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 that the …
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Improving inter-area oscillations damping of power systems through cooperative active power control of distributed energy resources
The remarkable growth of power electronics-interfaced renewable generations in the electric power grid has the potential to pronounce the effect of frequency disturbances such as inter-area oscillations. These low-frequency disturbances reduce transmission lines capacity, and at worst even damage …
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Voltage collapse modes in power networks
Voltage Collapse is instability of a heavily loaded electric power system, which leads to declining voltages and blackout, and it is typically associated with reactive power limitations of the power system. Therefore, knowledge of the critical loading point is vital to ensure a secure mode of …
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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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The management of a utility-scale battery storage system for renewable energy applications
… of government policies. The output from solar power aligns reasonably well with daytime consumption on the electricity grid, reducing the need for new fossil power stations. Industry experts estimate about 5,000 MW of photovoltaic (PV) will connect to the power grid in only 10 years. However, …