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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 65 for “"power system stability"”.
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Identification of Power System Stability Using Relevant Modes
… of capacitor banks and sources of reactive power by studying power system stability in the vicinity of system equilibrium states. The locations for reactive power sources are determined by identifying those modes of the system that participate most in the system behavior in general and in …
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Wind farm model for power system stability analysis
… the modeling of wind farms based on type-C wind power generators (WTGs) is studied. Based on time scale decomposition, two detailed dynamic models are presented. In both models, a rotor speed controller, a reactive power controller and a pitch angle controller are considered. The turbine's …
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Feedback linearizing generator excitation control for enhanced power system stability
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
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Superconducting magnetic energy storage for power system stability and quality enhancement
The stability of power systems has become the most critical issue affecting their quality and performance. Concerns over climate change are now moving the energy sector into a new era of modern power grids. To sustain the reliable operation of power systems and improve the quality of power …
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Power system stability evaluation using the miniaturized A-C network analyzer
One of the most important problems involved in power system operations is stability evaluations to determine whether or not a system will remain in synchronism during transient disturbances. The mathematical expressions from which stability is determined are relatively simple in themselves; …
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Impacts of superconducting magnetic energy storage unit on power system stability
… magnetic energy storage (SMES) unit on the power system first-swing stability by the impedance model of the SMES unit and EMTP simulations. The impedance model of the SMES unit is established in this thesis for study purpose. It has been concluded that SMES unit can greatly improve the power …
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Real-time phasor measurements for improved monitoring and control of power system stability
… phasor measurements for voltage and transient stability monitoring and control. Taking advantage of the ability of a Phasor Measurement Unit (PMU) placed at a bus to sample at a fast rate the voltage and current phasors of that bus) various schemes for placing PMU's are considered and …
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Power System Stability Improvement with Decommissioned Synchronous Machine Using Koopman Operator Based Model Predictive Control
… the decommissioned generator interfaced with power grid via a back-to-back converter to provide inertia support. This is referred to as decoupled synchronous machine system (DSMS). On top of that, the grid-side converter is capable of providing reactive power as an auxiliary voltage …
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Renewable Energy Integrated Power System Stability Assessment with Validated System Model Based on PMU Measurements
… is playing an increasingly significant role in power system operation and stability assessment with its numerous penetration expansion. This is not only brought by its uncertain power output and inverter-based equipment structures but also its operation characteristics like Low Voltage Ride …
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Stability studies of Sasol Synfuels Transmission and Distribution network under fault conditions and N-1 supply contingency
The aim of the work is to perform a transient stability analysis of the Sasol Synfuels Transmission and Distribution network when the power system is subjected to fault conditions and N-1 supply contingency conditions. The work provides an overview of the problem of power system stability as well …
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Application of PMU for system stability analysis with Thevenin equivalent modeling
… verification of the proposed method to analyze power system stability by utilizing phasor measurement units (PMUs). In the past decades, industrialization has expanded rapidly around the world, and the demand for stable and reliable power sources has increased. Therefore, maintaining stable …
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Impact of stochastic loads and generations on power system transient stability
"Randomness in physical systems is usually ultimately attributed to external noise. Dynamic systems are driven not only by our own control inputs, but also disturbances which cannot be modeled deterministically. A linear system model is justifiable for a number of reasons, often such a model is …
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Dynamic Security Assessment of Power Systems Using Trajectory Sensitivity Approach
In the restructured environment, power systems are often operated close to the edge of instability. In those scenarios, the problem of dynamic security assessment becomes very important. This study proposes techniques to address various aspects of this problem based on a trajectory sensitivity …
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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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Transient Stability Analysis of Power Systems with Energy Storage
Power systems can effectively damp power system oscillations through appropriate management of real or reactive power. This thesis addresses some problems in power system stability with and without energy storage.A power system model with energy storage is used to analyze the influence of …
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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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Spline based controller for nonlinear systems
… theory to implement controllers for nonlinear systems. Two different systems, forced Duffing oscillators and power systems, are investigated. The spline method is used to mimic the controller which drives a state of the Duffing system toward a desired path. The spline-based nonlinear controller …
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On the application of PMU measurements to system stability analysis
This thesis proposes a method to analyze power system stability by utilizing PMU measurements. As the current power system is operated close to its limits, stability is of high concern for both operators and customers. The implementation of phasor measurement units across the power system allows …
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