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Study of interactions among control, defense, and protection systems in small systems with HVDC links and large penetration of renewables

pubblicazioni - Memoria

Study of interactions among control, defense, and protection systems in small systems with HVDC links and large penetration of renewables

La memoria analizza alcuni dei fenomeni di stabilità e delle interazioni che possono interessare sistemi elettrici di dimensioni relativamente piccole, caratterizzati da bassa inerzia, bassa potenza di cortocircuito e alta produzione da RES, e collegati debolmente a grandi sistemi tramite collegamenti HVDC.

High Voltage Direct Current (HVDC) links help to integrate large amounts of power from Renewable Energy Sources (RES), however they may interact in complex ways with the control, defense, and protection systems of the power grid. The paper analyses some of the stability phenomena and interactions that may affect small systems weakly connected with the bulk power system via HVDC links, and characterized by low inertia, low short circuit power, and high production from RES.

To this purpose, detailed time-domain simulations are performed, based on phasor models, to study severe disturbances such as short circuits close to the AC terminals of HVDC link. The stability outcome is significantly dependent on the control and defense system parameters. A sensitivity analysis is performed and the resulting changes in system performance indicators are discussed.

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