38results about How to "Implement risk assessment" patented technology

The invention relates to a transformer risk prediction method based on markov and entropy weight fuzzy comprehensive evaluation. The method comprises the following steps of: (1) establishing a transformer full-stage model based on a markov process; (2) acquiring a markov state transition diaphragm of a transformer at a running state according to the transformer full-stage model, and the probability of the transformer at full state as well as the fault frequency of each part of the transformer; (3) calculating the fault severity of each part in faults through an entropy weight fuzzy algorithm; and (4) determining the risk of each part of the transformer according to the fault frequency and the fault severity of each part. Compared with the prior art, the transformer risk prediction method based on markov and entropy weight fuzzy comprehensive evaluation provided by the invention has the advantages of high precision, high accuracy and the like.

The invention discloses a risk assessment method for a wind power-based AC / DC hybrid system. The risk assessment method comprises the following steps: 1, according to the historical statistic wind speed data of a wind farm, modeling the wind speed distribution of the wind farm by using a Weibull distribution two-parameter curve; 2, according to a probability distribution model of the wind speed ofthe wind farm, sampling the wind speed by a non-sequential Monte Carlo method; 3, establishing a wind speed and wind turbine output model of the wind farm, and acquiring corresponding wind turbine output according to the wind speed of the wind farm, which is sampled by the non-sequential Monte Carlo method; 4, performing state analysis on a determined system state, and solving the tidal current of the hybrid system by a unified AC / DC system iteration method; 5, calculating a variance coefficient, judging whether a convergence condition of the non-sequential Monte Carlo method is met, if the convergence condition of the non-sequential Monte Carlo method is not met, returning to the step 2, and if the convergence condition of the non-sequential Monte Carlo method is met, calculating a comprehensive risk value. The risk assessment method is reliable, easy to implement and easy to popularize.

The security risk assessment method of assets in the network based on game theory builds an assessment model in which the system administrator and the attacker play games on each vulnerability through game theory. The system administrator has the choice of paying attention to or ignoring the vulnerability, while the attack The attacker has the choice of attacking or not attacking the vulnerability. From the analysis of the income of both parties, neither the system administrator nor the attacker can ensure that the game reaches a balance by choosing an action. Therefore, both parties need to use a mixed strategy to make the income Maximum, according to the game model, the strategy of the system administrator and the attacker when the game reaches a balance is deduced, and then the risk degree of the asset is obtained; the advantage of the present invention is that it can combine the information of the vulnerability library to analyze the risk of the asset in the network, And can provide support for the overall network security risk assessment.