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A Method for Identifying Weak Lines in Power System

A power system and identification method technology, which is applied to emergency protection circuit devices, electrical components, fault locations, etc., can solve the problems of weak line identification results prone to errors and omissions, traversal fault simulation times, and failure to consider transient stability. Achieve the effect of reducing the number of transient stability simulation calculations, saving simulation time, and reducing workload

Active Publication Date: 2019-11-22
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a method for identifying weak lines in a power system, which is used to solve the problem that the weak line identification results are difficult to identify due to too many simulation times required for traversing faults due to the lack of consideration of transient stability in the existing algorithm identification of weak lines and the establishment of expected fault sets through experience. technical issues

Method used

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  • A Method for Identifying Weak Lines in Power System
  • A Method for Identifying Weak Lines in Power System
  • A Method for Identifying Weak Lines in Power System

Examples

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Effect test

Embodiment 1

[0052] A method 100 for identifying weak lines in a power system, such as figure 1 shown, including:

[0053] Step 110, based on the power system transient simulation, initialize the power system, so that each line in the power system is in a normal working state, and the tangent combination is empty;

[0054] Step 120, based on the Q value table and the greedy coefficient ε, add a line to the tangent combination to determine a new tangent combination;

[0055] Step 130. Determine whether the stability information of the power system corresponding to the tangent combination exists in the database. If yes, perform step 140. If not, obtain and save the stability information of the power system corresponding to the tangent combination through power system transient simulation;

[0056] Step 140: Based on the stability information, update the Q value corresponding to the tangent line combination in the Q value table, and if the stability information indicates instability, then pe...

Embodiment 2

[0164] A storage medium, in which instructions are stored, and when a computer reads the instructions, the computer is made to execute any method for identifying weak lines in a power system as described above.

[0165] The instructions stored in the storage medium are the same as those described in Embodiment 1, and will not be repeated here.

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Abstract

The invention relates to an electric system weak circuit identification method. Based on the Q learning algorithm, the identification method comprises searching different fault tangent combinations byadopting epsilon-greedy strategy according to the current running state information of a power grid, and computing the system transient safety stability under the fault tangent combination given by the verification through the power grid transient stable simulation; and then the Q values of different tangent combinations are continuously updated by combining a transient stable simulation computation result through the Q learning algorithm, thereby screening out the tangent combinations easily causing the system instability; and based on the Q values of different tangent combinations, a circuit weakness index is proposed, and the weak circuit considering the power grid transient safety stability is obtained through computation. The weak circuit considering the system transient safety stability can be effectively distinguished by utilizing the Q learning algorithm, the required simulation frequency is much less than the fault traversal identification method, and the workload of the power grid running experts and the technicist for performing stability analysis and tidal current adjusting under different running ways can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of weak line identification, in particular to a method for identifying weak line in a power system. Background technique [0002] In large-scale interconnected power grids, due to the limitation of line transmission capacity and grid structure constraints, some transmission lines are out of operation due to accidental events, which can easily lead to system load loss, line overload, and even chain failures, which eventually evolve into safety issues such as grid collapse and major blackouts. ACCIDENT. Identifying weak lines in the power grid in advance to find out and reinforce weak transmission lines under the current power grid structure and operation mode is of great significance for guiding power grid planning, operation and dispatching, ensuring power supply reliability of the power grid, and maintaining safe and stable operation of the power grid. [0003] At present, most of the identification work o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 姚伟曾令康艾小猛文劲宇汤涌郭强黄彦浩
Owner HUAZHONG UNIV OF SCI & TECH
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