Instability mode division method on multi-frequency oscillation scene

A multi-frequency oscillation, scene technology, used in instruments, AC network circuits, electrical components, etc.

Inactive Publication Date: 2016-01-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it has been a matter of great concern to experts and scholars at home and abroad for many years to explain this phenomenon by using successive two-group instability or multi-group instability. In multi-frequency scenarios, the division method of instability modes needs to be studied urgently.

Method used

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  • Instability mode division method on multi-frequency oscillation scene
  • Instability mode division method on multi-frequency oscillation scene
  • Instability mode division method on multi-frequency oscillation scene

Examples

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Embodiment 1

[0089] Taking a certain regional interconnected power grid as an example, the method of the present invention is used to divide instability modes in a multi-frequency scenario in combination with the accompanying drawings.

[0090] A method for dividing instability modes in a multi-frequency oscillation scenario, specifically comprising the following steps:

[0091] Step 1: Build the actual power grid model on the power system simulation software platform, set up faults and perform time-domain simulation to obtain the required data such as generator speed and power angle.

[0092] figure 2 It is part of the grid structure of a regional power grid in my country.

[0093] Fault setting: For the double-circuit line of A-B tie line L5, set one circuit to be permanently disconnected, and the other circuit to have a three-phase short-circuit fault lasting 0.7s (assuming the fault is not handled in time).

[0094] Step 2: Calculate the destabilization time t of the original system...

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Abstract

The invention discloses an instability mode division method on a multi-frequency oscillation scene, belongs to the field of transient stability analysis in the power system, and aims at solving the problems that instability modes are hard to distinguish on the multi-frequency oscillation scene at present and further corresponding deserializing strategies are hard to configure according to the instability modes. The method comprises that data including rotating speed and power angle of a power generator is collected according to the prior art; group transient energy of an original power system is calculated, and the instability time tm of the original system is calculated according to deceleration power among groups; transient energy of a subsystem of low coherence is calculated and the deposed, and the critical deserializing time tn of the subsystem is calculated according to change rule, obtained by deposition, of the group transient energy; and tm and tn are compared with a fault clearance time tc to obtain the instability mode of the power system on the multi-frequency scene. A new ideal is provided, and a division result obtained via the method is closer to engineering practicality and more reasonable.

Description

technical field [0001] The invention relates to the field of transient stability analysis of power systems, in particular to a method for dividing instability modes in a multi-frequency oscillation scene. Background technique [0002] With the implementation of the strategy of "power transmission from west to east, north-south interconnection" and the approval of several UHV projects, my country has realized the interconnection of major regional power grids, and will quickly form a large national power grid. Large-scale interconnected power systems have the advantages of improving energy utilization, reducing accidents and maintenance reserve capacity, improving safety levels, etc., and have significant social and economic benefits. However, due to the complex operation mode of large power grids, chain reactions are prone to occur when faults occur. The scope of power outages is large, the time is long, and the consequences are serious. Especially when the grid structure is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/06H02J3/00
Inventor 胡永强陈长胜赵书强
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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