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A method and device for analyzing cascading faults in transmission sections of AC and DC power grids

A technology for AC power transmission and cascading failures, which is applied in the layout of AC and DC network circuits, circuit devices, and AC network circuits.

Active Publication Date: 2021-09-03
GUANGXI POWER GRID CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Scholars at home and abroad have carried out research on cascading failures and achieved a lot of results, but the traditional theories, models and analysis methods of cascading failures in AC power grids are difficult to apply to cascading failures in AC and DC power grids, and some of them are suitable for cascading faults in AC and DC power grids. , models and analysis methods are relatively simple and cannot accurately reflect the characteristics of cascading faults, especially the mutual influence between AC and DC.
[0004] It is generally believed that the DC system fault will affect the power flow transfer of the AC system and the transmission power of the transmission section, and the AC fault will affect the DC commutation bus voltage and cause commutation failure and blockage. However, there are still problems in how to accurately analyze the above characteristics
If the electromechanical transient simulation is used, the simulation of the commutation failure characteristics of the DC system is inaccurate. If the electromagnetic transient simulation is used, it will be limited by the scale and the power grid needs to be simplified first, making the simulation of the AC system characteristics inaccurate.

Method used

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  • A method and device for analyzing cascading faults in transmission sections of AC and DC power grids
  • A method and device for analyzing cascading faults in transmission sections of AC and DC power grids
  • A method and device for analyzing cascading faults in transmission sections of AC and DC power grids

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Embodiment 1

[0055] see figure 1 , is a schematic flow chart of a method for analyzing cascading faults in transmission sections of an AC / DC power grid provided in Embodiment 1 of the present invention, and the method includes steps S101 to S105.

[0056] S101. Select an AC transmission section of the power grid, and acquire line current data of each transmission line in the AC transmission section.

[0057] S102. According to the line current data of the transmission line, using a preset electromechanical and electromagnetic simulation model, calculate the power flow transfer coefficient between the transmission lines in the AC transmission section.

[0058] In an optional embodiment, step S101 is specifically:

[0059] Calculate the power flow transfer coefficient between the transmission lines in the AC transmission section according to the formula (1):

[0060]

[0061] in, is the transmission line L i For transmission line L k The power flow transfer coefficient; L i , L k ...

Embodiment 2

[0105] see image 3 , which is a schematic structural diagram of an analysis device for cascading faults in transmission sections of AC and DC power grids provided in Embodiment 2 of the present invention, including:

[0106] AC transmission section selection module 201, configured to select an AC transmission section of the power grid, and obtain line current data of each transmission line in the AC transmission section;

[0107] The power flow transfer coefficient calculation module 202 is used to calculate the power flow transfer coefficient between the transmission lines in the AC transmission section using a preset electromechanical electromagnetic simulation model according to the line current data of the transmission line;

[0108] The maximum overload rate calculation module 203 is used to calculate the maximum overload rate of each transmission line in the AC transmission section according to the power flow transfer coefficient between the transmission lines in the AC...

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Abstract

The invention discloses a method and device for analyzing cascading faults of AC and DC power grid transmission sections. Current data, using a preset electromechanical electromagnetic simulation model to calculate the power flow transfer coefficient between each transmission line in the AC transmission section; according to the power flow transfer coefficient between each transmission line in the AC power transmission section, calculate the AC power transmission section According to the maximum overload rate of each transmission line in the AC transmission section, the line fault tripping sequence of the AC transmission section is obtained; according to the line fault tripping sequence, the electromechanical electromagnetic simulation is used. The model is simulated and calculated to obtain the cascading fault tripping sequence of the AC transmission section, which can accurately reflect the mutual influence between the AC and DC in the process of the cascading fault.

Description

technical field [0001] The invention relates to the technical field of simulation analysis of cascading faults in electric power systems, in particular to an analysis method and device for cascading faults of transmission sections of AC and DC power grids. Background technique [0002] As the power grids in various regions are interconnected through DC or AC to form a larger-scale AC-DC hybrid power grid, grid faults are more likely to spread to a wider range through cascading faults, causing greater harm to the safe operation of the grid. There have been many blackouts caused by cascading faults at home and abroad, which shows that cascading faults have become one of the important factors that threaten the safe operation of power grids. [0003] Scholars at home and abroad have carried out research on cascading failures and achieved a lot of results, but the traditional theories, models and analysis methods of cascading failures in AC power grids are difficult to apply to c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J4/00H02H7/28
CPCH02H7/28H02J3/00H02J4/00
Inventor 李凌梁振成邓秋荃李一铭卢纯颢卓毅鑫凌武能刘蔚张野周挺辉
Owner GUANGXI POWER GRID CORP
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