Static Security Analysis Considering Uncertainty In Power System

As the modern society is developing all the time, the demand of electric power is increasing fast, which makes the scale of the power system greater day by day. The more complicated the power system becomes, the higher all kinds of fault probability becomes. If the fault can't be solven in time, it is possible to result in a large scale of power failure and severe stability problem. Therefore, the static safety analysis of power system becomes more and more important. Static safety analysis is used to judge wehther over-load or over-voltage case appears at transmission lines in allusion to a set of assumed accidents or not. Because the uncertain feature has been increased severely, the weak ness of the classical node-to-node analysis method is exposed, and the uncertain analysis method begins to catch people's attention.Interval analysis method is applied to the static safety analysis of power system considering uncertainty in this paper. The main work includes:1) Discussing the interval operation and its basic application; Introducing the interval expansion style of the linear equation set; Studying its solution method; Raising the interval number sorting theory, that is the credibility measuring function for the greater interval.2) Puting forwards an improved reliability measuring method for interval comparison.3) Constructing the interval algorithm model for direct power flow; Using the example of 3rd node and 30th node measured system is used to compare the conservatism with the result of Monte Carlo simulation algorithm to prove the correctness and feasibility of the interval algorithm.4) Applying static safety analysis with the line break model of the direct power flow interval algorithm; Obtaining the interval of the static safety active power action indicator; using the reliability measuring method for interval comparison, sorting the fault severity level from the most to the least.At the end of the paper, the conclusion is reached: It can reflect the fault severity level objectively to apply the interval analysis algorithm to the static safety analysis of power system considering uncertainty. Therefore, it is a feasible algorithm.