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.
Results
Showing 1 to 9 of 9 for “"Geomagnetic disturbance"”.
-
Geomagnetically induced currents and their effect on power systems
… induce a change in the Earth’s magnetic field. Geomagnetically induced current (GIC) then enters the power grid and causes unusual real and reactive power flows, voltage fluctuations, frequency shifts, undesired relay operations, high third-harmonic currents and telemetry and supervisory alarm …
-
Geomagnetically induced current sensitivity to assumed substation grounding resistances in the power system
A geomagnetic disturbance (GMD) can result in severe damage to the power grid by inducing quasi-dc currents called geomagnetically induced current (GIC). Protection against GMD therefore necessitates the accurate estimation of GICs. GICs estimation is challenging because it depends on substation …
-
Optimal Mitigation of Geomagnetically Induced Current Effects in Power Systems Considering Transformer Thermal Limits
… the earth’s space environment causes temporary disturbance to the earth’s magnetosphere. Solar flares and coronal mass ejections (CME) of charged and magnetized particles can disturb the earth’s magnetic field and cause geomagnetic disturbance (GMD). GMDs are of particular concern as they give …
-
Power transformer magnetization under GIC/GMD
Geomagnetically induced currents (GIC) could saturate a transformer core. Two significant effects are the abnormal stray flux in transformers and extremely large harmonic contents in excitation currents, which can lead to serious equipment damage and power system misoperation. Such incidents have …
-
Operational modelling of geomagnetic fields and geomagnetically induced currents
Geomagnetically induced currents (GICs) have long been known to affect power systems adversely. Modelling these GICs usually involves consideration of a chain of coupled systems. The scope of the modelling chain spans multiple disciplines, from solar physics through to geophysics and power …
-
Geomagnetically induced currents (GIC) in large power systems including transformer time response
Geomagnetically induced currents (GIC) are the result of changing geomagnetic fields which are a consequence of a geomagnetic disturbance (GMD). The flow of GIC through transmission lines and transformers across the power network could have severe consequences, if the magnitudes of the GIC are high …
-
Power distribution feeder response to the asymmetric saturation of substation transformers caused by significant high-side DC currents.
High-altitude electromagnetic-pulse and geomagnetic disturbances can lead to asymmetric saturation of utility transformer cores by causing significant DC current to flow through the transformer windings. Transformer secondary voltage and current waveforms are distorted by core saturation and this …
-
The creation of synthetic power grids: preliminary considerations
This Thesis was approved for publication on 2016-11-21 at 09:16.
-
High-performance computing for smart grid analysis and optimization
… addressing OPF related problems, we also study geomagnetic disturbances (GMDs) and how to mitigate their threat to the reliability of power grids. Geomagnetically induced currents (GICs) introduced by GMDs can damage transformers, increase reactive power losses and cause reliability issues in …