On 28 September 2016

electricity supply in South Australia was interrupted in the region under a black system across the state where renewable energy generation accounted for as high as 48. 36% and lasted for 50 hours until load was restored. This is the first regional blackout event in the world triggered by severe weather with large amounts of renewable energy that tripped off the grid. This paper describes the whole “9·28” blackout event step by step from pre-event generation power ratio

sequence of blackout evolution to post-event black system restart. The enlightenment of “9·28” South Australia blackout event to the safe operation of Chinese power system is summarized from different dimensions

like online calculation ancillary decision-making system

system moment of inertia

low voltage ride through requirement

low frequency load shedding and black system restart plan.