Large power grid quiescent voltage stability situation evaluation method and system based on linear deduction

Abstract

The invention provides a large power grid quiescent voltage stability situation evaluation method and system based on linear deduction. The method comprises the following steps: obtaining a stabilitymargin index and a voltage amplitude under an estimated tide section by utilizing linear deduction calculation under a second-level time scale; and constructing a voltage stability situation evaluation index reflecting the power grid operation development trend based on the stability margin difference between the adjacent sections, and judging the system operation development trend according to the size of the voltage stability evaluation index. According to the method, the stability margin index of the estimated section can be accurately and quickly estimated by adopting a linear deduction method; the method is advantaged in that a defect of large calculation amount caused by Jacobian matrix inversion operation of a traditional method is overcome, real-time demands of subsequent prevention and control optimization decisions are adapted, the voltage stability situation evaluation index is constructed, and the operation development trend of the electric power system can be directly determined through the index.

Description

technical field [0001] The present disclosure relates to the technical field related to power system operation control, and specifically relates to a method and system for assessing static voltage stability situation of a large power grid based on linear derivation. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] One of the important functions of the smart grid is to improve the situational awareness, visualization and early warning capabilities of the grid in order to achieve the purpose of intelligent monitoring. Among them, situational awareness or assessment refers to the perception and understanding of each element or object in the environment and the prediction of the future state at a specific time and space, which can include three stages: situational element collection, real-time situational understanding, and future situational...

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Problems solved by technology

However, due to the complex index system itself and the many factors affecting the trend change, the overall calculation of all indicators is very large, which cannot meet the speed requirements of real-time security assessment and situation analysis of the power grid. In addition, considering that the comprehensive evaluation index is a combination of multiple indicators, Therefore, it is difficult to form a direct quantitative mapping relationship with operating conditions and control measures, resulting in the inability to guide follow-up prevention and control optimization decisions based on the situation assessment results

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