Spectral clustering region division-based power system stability judgment method and system

Abstract

The invention relates to a spectral clustering region division-based power system stability judgment method and system. The method comprises the steps of performing region division on the whole powersystem according to a spectral clustering algorithm; acquiring total capacity of a power generator in each region, a current frequency value of a node, a rated frequency value, a total mechanical power of the power generator and a total electromagnetic power of the power generator, and calculating a regional equivalent inertia time constant; correcting the regional equivalent inertia time constantof each region, and acquiring a region correction equivalent inertia time constant of each region, and calculating a system correction equivalent inertia time constant according to region correctionequivalent inertia time constants of all regions; and judging the power system stability according to the system correction equivalent inertia time constant. Compared with the prior, the method has the advantages that the influence of node frequency inconsistency during a disturbance period on inertia estimation of the power system is reduced, so that more accurate equivalent inertia time constantis obtained and is used for judging the stability of the power system.

Description

technical field [0001] The invention relates to the field of online monitoring and control of electric power systems, in particular to a method and system for judging the stability of electric power systems based on spectral clustering area division. Background technique [0002] In the grid connection of new energy or the application of large-scale AC and DC transmission technology, power electronic equipment is an indispensable part. The application of power electronic equipment has provided great convenience for human beings, and the way of power generation has become more efficient and pure. However, the disadvantages of the application of power electronic devices are becoming increasingly prominent. The power electronics decouple the grid and generation side, which prevents the inertia of the generator part from being transferred to the grid. The inertia existing in the rotating mechanisms of synchronous generators and turbines is an important parameter for the stable...

AI Technical Summary

Problems solved by technology

However, the following problems exist in the existing inertial time constant algorithm: when a disturbance event occurs in the power system, the inconsistency of the frequency change on each node of the entire system will bring difficulties to the inertia evaluation and affect the accuracy of the inertial time constant and accuracy

In addition, under the application of large-scale AC and DC transmission technology and the integration of new energy into the grid, there is also a lack of research on the level of regional inertia

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