Power grid dynamic safety assessment method based on blind area identification and electrical coordinate system expansion

A dynamic safety and coordinate system technology, which is applied to electrical components, AC networks with different sources of the same frequency, circuit devices, etc., can solve the problem of insufficient accuracy of fault location representation in local areas, and improve accuracy and recognition efficiency. The effect of improving accuracy and reducing search time

Active Publication Date: 2022-01-28
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, considering the electrical coordinate system constructed by the electrical position relationship between nodes in the global scope of the system, there may be a defect that the accuracy of fault location representation in local areas is insufficient

Method used

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  • Power grid dynamic safety assessment method based on blind area identification and electrical coordinate system expansion
  • Power grid dynamic safety assessment method based on blind area identification and electrical coordinate system expansion
  • Power grid dynamic safety assessment method based on blind area identification and electrical coordinate system expansion

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Embodiment 1

[0093] Embodiment 1 of the present invention provides a dynamic security assessment method for power grids based on blind area identification and electrical coordinate system expansion, such as figure 1 shown, including the following steps:

[0094] First, obtain the grid network line parameters and topological connection relationship, generate node admittance matrix, and construct the initial electrical coordinate system;

[0095] Then, a fast search method for the blind line in the electrical coordinate system considering adjacent lines is proposed, and the blind line is quickly searched in the initial electrical coordinate system;

[0096] Then, a blind area identification algorithm based on adjacency matrix is ​​proposed, and the range of each initial blind area is determined according to the searched blind lines;

[0097] Then, fine-tune each initial blind zone based on the evaluation results of the DSA model;

[0098] Then, for the fine-tuned dead zone, the reference n...

Embodiment 2

[0187] Embodiment 2 of the present invention provides a power grid dynamic security assessment system based on blind area identification and electrical coordinate system expansion, including:

[0188] The data acquisition module is configured to: acquire fault location nodes and steady-state power flow characteristics of the power grid;

[0189] The electrical coordinate acquisition module is configured to: acquire the electrical coordinates of the fault location node in the extended electrical coordinate system;

[0190] The dynamic security assessment module is configured to: obtain a dynamic security assessment result of the power grid according to the obtained electrical coordinates and steady-state power flow characteristics, combined with a pre-trained dynamic security assessment model;

[0191] Among them, the initial electrical coordinate system is constructed according to the obtained grid network parameters, and the blind line search is carried out according to the i...

Embodiment 3

[0194] Embodiment 3 of the present invention provides a computer-readable storage medium on which a program is stored. When the program is executed by a processor, the dynamic security of the power grid based on blind spot identification and electrical coordinate system expansion as described in Embodiment 1 of the present invention is realized. Steps in the evaluation method.

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Abstract

The invention provides a power grid dynamic safety assessment method based on blind area identification and electrical coordinate system expansion. The method comprises the following steps: acquiring a fault position node and a steady-state power flow characteristic of a power grid; obtaining an electrical coordinate of the fault position node in the extended electrical coordinate system; according to the obtained electrical coordinates and the steady-state power flow characteristics, combining a pre-trained dynamic safety evaluation model to obtain a dynamic safety evaluation result of the power grid, wherein an initial electrical coordinate system is constructed according to acquired power grid network parameters, blind line search is performed according to the initial electrical coordinate system to obtain an initial blind area, the blind area is finely adjusted, reference nodes are expanded for the finely adjusted blind area, and an expanded electrical coordinate system is obtained by combining the expanded reference nodes. According to the invention, the fault position characterization precision of the blind area is improved, and the accuracy of dynamic safety evaluation of the power grid is further improved.

Description

technical field [0001] The invention relates to the technical field of power system security assessment, in particular to a dynamic security assessment method for a power grid based on blind area identification and electrical coordinate system expansion. Background technique [0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art. [0003] The inherent intermittent and strong volatility of new energy makes the dynamic security risks faced by the power system significantly increase. In order to ensure the safe and stable operation of the system, it is necessary to sample and generate a large number of possible scenarios for complex and changeable power grid conditions, and to identify potential dynamic security risks of the system in a timely manner through Dynamic Security Assessment (DSA). DSA based on time-domain simulation is a commonly used method for model-driven class evaluation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q10/04G06Q50/06G06F17/16H02J3/06
CPCG06Q10/06393G06Q10/04G06Q50/06G06F17/16H02J3/06H02J2203/10H02J2203/20Y04S10/52
Inventor 李常刚齐航任喆刘玉田
Owner SHANDONG UNIV
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