摘要
This paper investigates two major blackouts occurred on May 13 and 17, 2021 in Taiwan power system. These two major blackouts occurred in just five days, affected 4.62 million and 1 million households, respectively. Although the causes of these two blackouts are not the same, both blackouts share several similarities. Both took place in the afternoon during May, high temperature, high load demand, poor water conditions, declining solar power generation, major maintenance, and restoration power system by electricity rationing. This paper reveals the power system operating condition prior to the blackout, examines the causes, outlines the blackout process, and describes the restoration of power system. Finally, the lessons learned from these two blackouts, as well as the strategies for preventing widespread blackouts in the future, are discussed.