The invention discloses an operation
risk evaluation method comprising a wind-power
plant electric
system. With view to affection on the electric
system from a wind-power
plant, the operation
risk evaluation method traces back to nodes and includes that real-time importance degree weights of the nodes are introduced into risk indexes, affection of a
network topology and real-time tide state information is comprehensively reflected, real-time risk variation of the electric
system under the action of the wind-power
plant can be truly reflected, updating of various state parameters and
risk level sequence is completed in real time in a short calculation period of system running
risk evaluation, the problem that operating monitoring of power plants or substation busses high in importance degree is ignored is avoided, value-at-risk is converted into a dimensionless utility value by evaluating a function through consequence severity of exponential risk-preferred utility function, the risk-at-value is increased at different degrees so as to increase
risk level difference identification degree and differentiation degree under same low-loss-load probability and scientifically compare different risk levels.