Method of recognizing power system transient stability negative correlation section based on trajectory

A technology of transient stability and power system, applied in electrical components, circuit devices, AC network circuits, etc., to simplify the control scheme, improve the safety, stability and automation level of the system

Active Publication Date: 2015-09-09
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
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Problems solved by technology

However, there is still no effective method for how to identify the negative correlation section of power system transient stability

Method used

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  • Method of recognizing power system transient stability negative correlation section based on trajectory

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Embodiment Construction

[0026] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0027] see figure 1 . figure 1 Step 1 in the above describes the time-domain simulation of transient stability under expected faults according to the operating state, model and parameters of the power grid;

[0028] figure 1 Step 2 in the above description is to identify the leading group and the remaining group of generators based on the simulation trajectory and the extended equal area rule (EEAC), and record the leading group as S group and the remaining group as A group. The participation factors of the dominant mode and the sensitivity of each unit to the active power of the components of the section (including lines, transformers, etc.) determine the key transmission section, which is recorded as the T1 section, and the units of the S group and the A group are equivalent For a generator, the equivalent two-machine system is obtained, an...

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Abstract

The invention discloses a method of recognizing a power system transient stability negative correlation section based on a trajectory, which belongs to the field of power systems and automatic technology thereof. The method of the invention is based on a power system transient stability quantification theory, system units are divided into a preceding group and a remaining group, a two-unit system is further formed equivalently until a single unit infinite system is formed equivalently, the number of peaks in first swinging of a system equivalent single unit infinite system power-angle response curve is used for initially judging whether a transient stability negative correlation section possibly exists in the system, if the peak number is larger than 1, two-unit equivalence based on an inertia center is further carried out on the preceding group and the remaining group respectively, and through comparing a power-angle phase difference at any moment of equivalent two units in different groups, whether a transient stability negative correlation section exists in the system is finally judged. A power system dispatching operator can master the internal operation rules of the grid, a grid dispatching operation control decision is made, and safety, stability and the automatic level of the system are enhanced.

Description

technical field [0001] The invention belongs to the technical field of power systems and automation thereof. More precisely, the invention relates to a trajectory-based identification method for transient stability negative correlation sections of power systems. Background technique [0002] The gradual formation of long-distance, large-capacity, inter-regional AC and DC transmission and the interconnection of national power grids, while achieving huge economic benefits, also makes the stability of the power system more complicated, and the coupling characteristics between different sections in the system have been strengthened , which brings great challenges to the traditional stability analysis and control. It is one of the most important responsibilities of the power system operation department to prevent the power system from collapsing and disintegrating, thereby preventing the occurrence of large-scale power outages. [0003] EEAC has established the concept of fault ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 李兆伟崔晓丹李威周霞刘福锁李碧君方勇杰任先成牛拴保程林
Owner STATE GRID CORP OF CHINA
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