Electric system interval power flow method based on convex polygon

Abstract

The present invention relates to an electric system power flow analysis technology, especially to an electric system interval power flow method based on a convex polygon. By taking a current affine algorithm as basis, a nondeterminacy power flow equation is improved to convert a traditional Newton-Laphson iteration method to a non-linear optimization problem; interval variables having relevance inthe electric system are selected to perform sampling of the interval variables and construct a convex polygon model; the convex polygon model is subjected to analytic transformation to transform therelevance of the interval variables to inequality constraints; the inequality constraint conditions of the power flow equation converted by employing the affine algorithm and the constraint conditionstransformed by the relevance of the interval variables are combined to obtain a set of new constraint conditions, and a target function for power flow calculation is optimized and solved by employingthe new constraint conditions to finally obtain an interval solution of the interval power flow. The method provided by the invention considers the possible relevance between the variables in the electric system, better accords with the operation state of the actual power grid and improves the reliability of planning and dispatching of the electric system.

Description

technical field [0001] The invention belongs to the technical field of power system power flow analysis, and in particular relates to a power system interval power flow method based on a convex polygon. Background technique [0002] Power flow calculation is one of the most basic tools for power system analysis. The most commonly used methods are the Newton-Raphson method and the forward-backward method, which are very practical and universal for conventional deterministic power flow calculations. However, in the actual power system operation, the fluctuation of load and the intermittent power injected by generators such as wind turbines will make the power flow calculation have the characteristics of uncertainty. For the uncertain power flow of the power system, due to the advantages of simple and efficient interval analysis, the interval power flow algorithm based on interval analysis is widely used at present. [0003] The initial interval power flow is to simply apply i...

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Problems solved by technology

[0003] The initial interval power flow is to simply apply interval analysis to the calculation of the power flow equation. Due to the conservative nature of the interval algorithm itself, the interval power flow solution is too conservative and the interval is too large. The result does not have much reference value

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