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Multiphysics modelling of asynchronously-connected grids

Increased penetration of distributed energy resources in distribution systems, such as renewables and
electric vehicles, necessitates investments in reserve capacity to deal with the variability of these resources. To limit these investments, the controllability of the new resources is used, unlocking local capacity and flexibility. The asynchronous connection of different portions of the grid makes it possible to influence the load power consumption by means of varying voltage and frequency. However, considering only the electrical layer in the modern system limits the controllability and flexibility of the system, adversely affecting the effectiveness and benefits of the overall system. For more effective solutions, it is necessary to integrate the thermal systems attached to the electrical systems, exchanging energy between
the two of them (e.g., CHP plants). We propose a multiphysics modeling approach of an asynchronous grid, where both electrical and thermal energy layers are considered. A quadratic modeling approach has been employed to decrease the complexity of the multiphysics problem. Results are presented which show the mutual interaction between the electrical and thermal energy systems, underlining the ability to optimize the integrated system. The inherent storage capability of thermal systems can be used to shift utilization of electrical energy for the purpose of optimizing the overall operation of the system.

Author(s):

Giovanni De Carne    
University of Kiel
Germany

Marco Liserre    
University of Kiel
Germany

Boqi Xie    
Georgia Institute of Technology
United States

Chiyang Zhong    
Georgia Institute of Technology
United States

Sakis A. P. Meliopoulos    
Georgia Institute of Technology
United States

Costas Vournas    
National Technical University of Athens
Greece

 

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