One-class sample-based voltage stability prediction judgment method

Abstract

The invention relates to a one-class sample-based voltage stability prediction judgment method. The method comprises the steps of obtaining a measurement value sample set of a stable running time period of a power grid; establishing a sample matrix of the measurement value sample set of the stable running time period of the power grid, compressing the dimension of the sample matrix, and updating the measurement value sample set of the stable running time period of the power grid; and obtaining a tested measurement value sample, judging whether the tested measurement value sample belongs to the measurement value sample set of the stable running time period of the power grid or not, and if yes, indicating that the power grid at a moment corresponding to the tested measurement value sample is stable. According to the method provided by the invention, classification and prediction can be performed only based on stable samples according to a characteristic of few instable samples of the power grid, and the problem that large-scale complex power systems cannot be really recovered because a power grid model is simplified in multiple aspects for research on power grid stability based on simulation software data is solved.

Description

technical field [0001] The invention relates to the field of voltage stability analysis, in particular to a method for predicting and judging voltage stability based on single-type samples. Background technique [0002] With the development of the Energy Internet, the degree of openness and competition of the power grid is getting higher and higher, and the unsafe factors and uncertainties in the operation and planning of the power system are also increasing. Large-scale power outages caused by voltage stability fluctuations have occurred in many countries in the world one after another, causing huge economic losses. Voltage security has become one of the main factors limiting power transmission. [0003] The power grid is the most complex artificial system today, and it is not yet possible to fully understand and master the operating laws of the power system. The traditional simulation modeling analysis makes a lot of assumptions and simplifications on the power system, w...

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Problems solved by technology

[0007] The present invention provides a method for predicting and judging voltage stability based on single-type samples. Its purpose is to classify and predict only based on stable samples based on the characteristics of few unstable samples in the power grid, and to overcome the problems caused by studying the stability of the power grid based on simulation software data. A lot of simplifications have been made to the power grid model so that it cannot truly restore the problem of complex large-scale complex power systems

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