关键词：电力系统;智能自动报警系统;复杂网络;级联故障
摘 要：According to the theory of complex network and risk assessment,a intelligent risk automatic warning system of catastrophic accident based on conditional risk function is presented.The warning system introduces electrical betweenness and conditional risk expectations to overcome the insignificance of traditional risk assessment which only considered the status of grid and N-1 accident.A risk index system of catastrophic accident is constructed which reflects the risk of grid when it is current and in the next level of fault and portrays the trend of spreading to the catastrophic.The simulation results prove that this method which the new system use can identify the risks effectively.Consequently it provide effective reference information for security assessment of power system.