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

A power system and area division technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as affecting the accuracy and accuracy of inertia time constants, lack of regional inertia levels, and inconsistent frequency changes, and achieve clustering. Good effect, simple calculation, effect of reducing the influence of inertia evaluation

Active Publication Date: 2019-07-09
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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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

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

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Embodiment Construction

[0051]The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0052] Such as figure 1 As mentioned above, this embodiment provides a method for judging the stability of a power system based on spectral clustering region division, and the specific steps include:

[0053] Step S1. Divide the entire power system into regions according to the spectral clustering algorithm;

[0054] Step S2. Obtain the total generator capacity, the current frequency value of the node, the rated frequency value, the total mechanical power of the generator, and the total electromagnetic power of the generator in each area, and calculate the equivalent inertial time con...

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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...

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 李东东张佳乐赵耀刘振宇高晓城杨帆林顺富
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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