scholarly journals Time‐domain modeling of 3‐D Earth's and planetary electromagnetic induction effect in ground and satellite observations

2021 ◽  
Author(s):  
Alexander V. Grayver ◽  
Alexey Kuvshinov ◽  
Dieter Werthmüller
Keyword(s):  
Time Domain ◽  
Electromagnetic Induction ◽  
Satellite Observations ◽  
Induction Effect ◽  
Domain Modeling ◽  
Time Domain Modeling

scholarly journals Feasibility of Black-Box Time Domain Modeling of Single-Phase Photovoltaic Inverters Using Artificial Neural Networks

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2118
Author(s):  
Elias Kaufhold ◽  
Simon Grandl ◽  
Jan Meyer ◽  
Peter Schegner
Keyword(s):  
Time Domain ◽  
Single Phase ◽  
Low Voltage ◽  
Black Box ◽  
Steady States ◽  
Domain Modeling ◽  
Dynamic Simulations ◽  
Time Domain Modeling ◽  
Artificial Neural ◽  
Grid Side

This paper introduces a new black-box approach for time domain modeling of commercially available single-phase photovoltaic (PV) inverters in low voltage networks. An artificial neural network is used as a nonlinear autoregressive exogenous model to represent the steady state behavior as well as dynamic changes of the PV inverter in the frequency range up to 2 kHz. The data for the training and the validation are generated by laboratory measurements of a commercially available inverter for low power applications, i.e., 4.6 kW. The state of the art modeling approaches are explained and the constraints are addressed. The appropriate set of data for training is proposed and the results show the suitability of the trained network as a black-box model in time domain. Such models are required, i.e., for dynamic simulations since they are able to represent the transition between two steady states, which is not possible with classical frequency-domain models (i.e., Norton models). The demonstrated results show that the trained model is able to represent the transition between two steady states and furthermore reflect the frequency coupling characteristic of the grid-side current.

Time-domain Modeling of Constant-Q Seismic Waves Using Fractional Derivatives

2002 ◽  
pp. 1719-1736 ◽  
Author(s):  
José M. Carcione ◽  
Fabio Cavallini ◽  
Francesco Mainardi ◽  
Andrzej Hanyga
Keyword(s):  
Time Domain ◽  
Fractional Derivatives ◽  
Seismic Waves ◽  
Domain Modeling ◽  
Time Domain Modeling
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