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Report RSE 17001178

Co-simulation of active networks: 4G communication channels



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S. Corti (RSE SpA), D. Moneta (RSE SpA) , M. Garau (Università di Cagliari), G. Celli (Università di Cagliari)

RETE-DIS 2016 - Evolution and development of distribution networks


In the field of joint and simultaneous simulation of electrical network and communication infrastructure, appropriate calculation tools still have to be developed and refined in order to properly plan theThe research here presented mainly concerns the introduction of a tool for the management of active network with fast dynamic events and the use of LTE in the representation of wireless ICT networks.

The developed tool uses the commercial simulation software DIgSILENT PowerFactory to represent the power grid and the open-source OMNeT++ to simulate the ICT network.

OMNeT++ has a modular approach that ensures easy extensibility of models according to an object-oriented logic; can be used on different systems, including Microsoft Windows; allows the use of new technologies, especially those reproducing the IEC 61850 protocol and the recent LTE. Co-simulation and software-user interface are managed through MATLAB that, thanks to the availability of Python API in DIgSILENT and compiling a Python script, can control electrical system by remote; also the simulation in OMNeT++ is permitted by the management of the appropriate socket.

A hybrid approach has been adopted for the synchronization of the two simulators; the method of fixed time-steps is used in DIgSILENT to determine the electrical quantities; the occurrence of contingencies or failures involves the use of event-driven logic for OMNeT++ simulator.

A case study in which a short circuit in a MV power grid supported with ICT network is managed with a remote centralized control of the line switches is presented. Each active node is equipped by a LTE receiving station automatically connected to the nearest radio base station. The results obtained from different simulated scenarios have allowed to verify the validity of the use of LTE, but also to check that the interference of the antennas of neighboring cells or the internal traffic to the cell itself will influence its performance.

Subsequent analyzes of the study could relate to the improvement of the communication logic according to the IEC 61850 protocol. Future developments of the software may consider introduction of agent based models; in addition to allow a realistic representation of the DMS (distribution management system) delays, it could allow comparative studies between the different control logics, centralized and distributed. evolution towards active intelligent distribution networks.

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