Secure states Illustration of states the overload line may cause a cascaded outage secure dispatch unit #1 generation set to maximum secure line loading of 400 MW 800MW 400MW 200MW 200MW unit #2 unit #1 ◆post contingency 1200MW consider the same contingency,resulting in no violations 800MW 400MW →0MW unit #2 unit #1 1200MW 家电电力系统广域测量与控制四川省重点实验室 Secure states