Improving dynamic stability with HVDC systems: Italy-Montenegro interconnector case

Nowadays modern power system are much more prone to the establishment of wide instability phenomena that could jeopardize overall security. Transmission System Operators (TSOs) must guarantee a stable and reliable operation of the managed power systems. A valid support in suppressing sudden power system oscillations can be provided by High Voltage Direct Current (HVDC) systems though the variation of the transmitted active power or the injected reactive power into the grid. Montenegro-Italy interconnector, a.k.a. MON.ITA, currently in phase of commissioning, is equipped with a power oscillation damping (POD) device. The paper presents the stability analyses devoted to the optimal tuning of MON.ITA POD controller and the validation of its goodness as well as the simulations aimed at demonstrating the aid provided by HVDC in suppression of undamped oscillations.