scholarly journals Time Domain Simulation of Geomagnetically Induced Current (GIC) Flowing in 500‐kV Power Grid in Japan Including a Three‐Dimensional Ground Inhomogeneity

Space Weather ◽  
2018 ◽  
Vol 16 (12) ◽  
pp. 1946-1959 ◽  
Author(s):  
S. Nakamura ◽  
Y. Ebihara ◽  
S. Fujita ◽  
T. Goto ◽  
N. Yamada ◽  
...  
Keyword(s):  
Time Domain ◽  
Power Grid ◽  
Three Dimensional ◽  
Induced Current ◽  
Time Domain Simulation ◽  
Geomagnetically Induced Current

scholarly journals Simulation and Analysis of Geomagnetically Induced Current Levels in Shandong Power Grid

Space Weather ◽  
2021 ◽  
Author(s):  
Han Wang ◽  
Zan‐Yang Xing ◽  
Nanan Balan ◽  
Yan‐Ling Wang ◽  
Qing‐He Zhang ◽  
...  
Keyword(s):  
Power Grid ◽  
Induced Current ◽  
Geomagnetically Induced Current

An Improved Time Domain Simulation for Dynamic Milling at Small Radial Immersions and Large Depths of Cut

2001 ◽  
Author(s):  
Marc L. Campomanes ◽  
Yusuf Altintas
Keyword(s):  
Surface Finish ◽  
Time Domain ◽  
Dynamic Models ◽  
Three Dimensional ◽  
Domain Model ◽  
Time Domain Simulation ◽  
Chatter Stability ◽  
Linear Effects ◽  
Deep Cuts ◽  
The Time Domain

Abstract This paper presents an improved time domain model for milling, which can simulate vibratory cutting conditions at very small radial widths of cut and large depths of cut. The improved kinematics model allows simulation of very small radial immersions. The varying dynamics modeled along the cutting depth allows milling with very flexible cutters and/or flexible workpieces at very deep cuts to be simulated. The model can predict forces, surface finish, and chatter stability, accurately accounting for non-linear effects that are difficult to model analytically. The discretized cutter and workpiece kinematics and dynamic models are used to represent the exact trochoidal motion of the cutter, and to investigate the effects of forced vibrations and changing radial immersion due to deflection and vibrations on chatter stability. Three dimensional surface finish profiles are predicted and are compared to measured results. Stability lobes generated from the time domain simulation are also shown for various cases.

Study on Variation Rate Characters of Mid-to-Low Latitude Area Geomagnetic Field during Geomagnetic Storms

2013 ◽  
Vol 448-453 ◽  
pp. 2125-2131
Author(s):  
Xiao Mao Wang
Keyword(s):  
Geomagnetic Field ◽  
Geomagnetic Storms ◽  
Power Grid ◽  
Geomagnetic Latitude ◽  
Induced Current ◽  
Low Latitude ◽  
Geomagnetically Induced Current ◽  
Faraday’S Law ◽  
Variation Rate ◽  
Measurement And Control

Geomagnetic field changes acutely during geomagnetic storms. According to Faraday's law of electromagnetic induction, the change of the geomagnetic field produces geomagnetically induced current (GIC) in power grid, which directly damages the power equipment and threatens safe operation of power grid. The more dramatically geomagnetic field changes, the bigger geomagnetically induced current in power grid becomes, and thus, the greater harm it brings to power grid. In this paper, based on the H and D components of recent geomagnetic storm data measured by several mid-to-low latitude geomagnetic observatories, the variation law of the amplitude of north-south and east-west geomagnetic component change rate (dX/dt and dY/dt) pulse with geomagnetic latitude was analyzed when geomagnetic field changed very severely. Finally, the possibilities of power grid in different direction affected by GIC with the change of latitude were discussed. The analysis results will contribute to the evaluation, measurement and control of GIC in Chinese current and future power grid.

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