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Report RSE 16002265

Co-simulazione e architetture di controllo per reti di distribuzione attive: valutazione perdifferenti tecnologie in MT e BT



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G. Celli (Università di Cagliari), M. Garau (Università di Cagliari), E. Ghiani (Università di Cagliari)

RETE-DIS 2015 - Evolution and development of distribution networks


The activity regarding the combined and simultaneous simulation of electricity distribution systems and ICT infrastructures (co-simulation) is gaining interest in the national and international research field. Co-simulation tools are needed to plan the evolution towards Smart Distribution Networks (SDN) and the implementation of Smart MicroGrids (SMG).

The research described in this document relates to the improvement of a co-simulation software (electric and ICT simultaneously) of active distribution networks, developed in the previous three years of “Ricerca di Sistema”.

The ability to simultaneously simulate different transmission media (wired and wireless) was introduced in the new version of the software; moreover low voltage (LV) distribution networks were regarded with more realistic details.

In place of the ns-2 simulator adopted in the previous version, the ICT networks simulation was realized with the Network Simulator version 3 (ns-3) simulator that provides a wider choice of technologies, greater flexibility in the implementation of the telecommunication architectures and greater adaptability in view of future developments.

Also, since loads and distributed generation in low voltage distribution networks, normally of singlephase type, determine a natural imbalance in the system with the appearance of a non-negligible current in the neutral conductor, the Distribution Management System (DMS) optimization algorithm has been modified in order to direct control even single-phase resources.

In the application example presented, communication between the central DMS and the active distributed resources was simulated with two different topological assumptions; in the first it was assumed that information transmission to the end-resources is made via only one transmission medium (WiMAX technology) with wide coverage, while in the second assumption two different communication technologies (WiMAX+PLC, WiMAX+Wi-Fi) placed in cascade have been used: one for the MV system to allow communication between the DMS and the medium/low voltage (MV/LV) distribution substations, and one for the LV system to reach every single controllable resource.

A network topology ICT with two cascade connected technologies represents an ideal architecture for realizing a hybrid system, with centralized control for MV and distributed control, or by agents, for LV; the proposed improvement is thus a major step towards obtaining a support tool which allows a comparison between different types of controls.

A bibliographic analysis to obtain useful information in order to prepare a version of the software that could study transients of electrical systems and effectiveness and efficiency of their controls (for example as a result of operations or failure) was finally initiated.

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