Blackout in Brazil Power Grid on February 4,2011 and Inspirations for Stable Operation of Power Grid

On February 4,2011,a wide spread electrical blackout occurred in Northeast Brazil power grid.The accident spread 8 states,and about 40 million people were involved.The pre-fault situation,cause,spread and restoration of the blackout are described.The lessons and experiences of the blackout are analyzed and summarized.Some recommendations for ensuring the security and stability of China's power grid and preventing the occurrence of blackout in China are presented.