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Project T&D-C.C. 2016

Transmission and distribution in direct current

Power System Research


Chiara Gandolfi

The document presents the main results of the research activity about LVDC, MVDC and HVDC grids: the activities have been developed with studies, simulations and experimental activities in the laboratory and in the DC microgrid available in RSE.

The project covered studies and experimental activities on DC networks at all voltage levels. About the MVDC distribution grid several aspects have been analyzed: the development of DC distribution grids with multiple levels of voltage, the impact to the grid of a Dual Active Bridge converter for interfacing MVDC and LVDC active grids; the connection criteria in LVDC; the ground management and the operation of multiterminal MVDCs in case of fault; the integration of MVDC links into the MV distribution network in OPF assessment optics. Furthermore, an experimental activity was carried out on the LVDC microgrid, available in RSE, in order to test the behavior of mixed networks AC and DC. At the same time, the development of a hybrid switch prototype for the LVDC networks has been done and the first tests were carried out. A

s regards the DC transmission grids, multi-scale modeling methodologies have been developed to predict the acoustic field in order to assess the acoustic noise produced by the lines due to coronal phenomena, especially in post-rain conditions. The analysis was supported by experimental activities in the High Voltage Laboratory and the experimental characterization of the behavior of polymer isolators for HVDC lines. With regard to VSC converters for HVDC link, the definition of control strategies for increasing the virtual inertia of the system, using properly the capacitors installed in the DC section has been carried out. The revamping of the SA.CO.I. with VSC technology to increase the connection capacity of renewable power has been studied. The simulation activity started with the implementation of models with the basic drive control schemes integrated with the power control function "P f" and the PSS (Power System Stabilizer) stabilization signals for damping electromechanical oscillations. At the end, the first analysis of the main economic and environmental benefits that might result from the realization of a VSC-HVDC connection have been carried out.

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Gandolfi Chiara