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A method for identifying key lines in AC-DC interconnected power grids

A technology for interconnecting power grids and key lines, which is applied in AC network circuits, power transmission AC networks, circuit devices, etc., and can solve problems such as identifying key lines in power grids.

Active Publication Date: 2020-02-14
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no simple and effective method to identify all critical lines in the power grid

Method used

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  • A method for identifying key lines in AC-DC interconnected power grids
  • A method for identifying key lines in AC-DC interconnected power grids
  • A method for identifying key lines in AC-DC interconnected power grids

Examples

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Embodiment

[0091] Figure 4 It is the system diagram of the selected IEEE30 node test system, which is used as an example to illustrate. In the example, a converter is added to node 2 and node 8 respectively, and a DC line is added between them to form an AC-DC interconnected power system.

[0092] 1. Collect the conventional technical parameters of the AC-DC interconnected grid, and calculate the initial power flow state of the grid.

[0093] Such as Figure 4 The AC-DC interconnected power system shown includes the number of AC nodes N bAC =30, the number of AC lines N lAC =41, the number of converter stations N cv =2, the number of DC system nodes N bDC =2, the total number of DC system lines N lDC =1, AC node parameters are shown in Table 1, AC line parameters are shown in Table 2, generator parameters are shown in Table 3, converter parameters are shown in Table 4, DC node parameters are shown in Table 5, and DC line parameters are shown in Table 6. In addition, considering t...

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Abstract

The invention discloses a method for identifying key lines in an AC-DC interconnected power grid and belongs to the field of electrical engineering. The method comprises first collecting conventionaltechnical parameters of the AC-DC interconnected power grid and obtaining an initial load flow state of the power grid, and then calculating a load flow state of an AC-DC system after the opening of acertain line through the initial load flow state of the power grid; calculating a static safety margin according to the load flow state of the AC-DC system after the line opening, finally comparing the static safety margin of the AC-DC system after the opening of each line, and deriving the critical order of each line in the AC-DC power grid as the smaller the static safety margin after the lineopening, the more insecure the system after the line opening. According to the method, the key lines in the AC-DC power grid can be identified more accurately, the reference is provided for the faultresponse and operation planning of a power system, and the method helps reduce the risk of faults in the AC-DC interconnected power system and improves the safety and reliability of the power system operation.

Description

technical field [0001] The invention belongs to the field of electrical engineering, and more specifically relates to a method for identifying key lines of an AC-DC interconnected power grid. Background technique [0002] Under the background of vigorous construction and development of UHV DC transmission, my country's power grid is gradually evolving into an AC-DC interconnected power system. However, with the expansion of HVDC transmission scale, the carrying and regulating capacity of the AC system in some areas is relatively insufficient. Once the line fails or the converter station is blocked, there will be a huge power imbalance between the sending end and the receiving end grid, which seriously endangers the operation safety of the power system; in addition, due to bad weather, failure of the relay protection device or Due to random reasons such as misoperation, faults often occur in the AC system. If they occur on a few more critical lines, such random local faults ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/06G06F30/20G06F113/04
CPCG06F30/367H02J3/06H02J3/36H02J2203/20Y02E60/60
Inventor 周博姚伟艾小猛方家琨文劲宇张振安李程昊刘畅谭阳琛
Owner HUAZHONG UNIV OF SCI & TECH