Weak link identification method and system for AC-DC hybrid power grid

An AC-DC hybrid technology with weak links, applied in the field of smart grid, can solve the problems of not taking into account the correlation of weak links, difficult to identify weak links, and difficult to adapt to AC-DC hybrid grid.

Active Publication Date: 2020-09-11
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to solve the problem that weak links are difficult to identify before the occurrence of cascading faults in the current power system, and that the identification of weak links in the current power grid does not fully consider the impact of DC transmission, does not take into account the correlation of weak links, and is difficult to adapt to AC and DC. Hybrid Grid Problems

Method used

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  • Weak link identification method and system for AC-DC hybrid power grid
  • Weak link identification method and system for AC-DC hybrid power grid
  • Weak link identification method and system for AC-DC hybrid power grid

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Embodiment 1

[0029] This embodiment provides a method for identifying weak links in an AC / DC hybrid power grid, including:

[0030] S1: Construct a vulnerability index calculation model for identifying weak links in the AC / DC hybrid power grid, namely:

[0031] R ij =1000C* i L(i)U(j)Q ij

[0032] Among them, R ij is the vulnerability index of the power transmission link; U(j) is the voltage ratio of the jth bus node; Q ij Indicates the correlation degree between the i-th transmission line and the j-th bus node; L(i) represents the ratio of the correlation degree of power flow transfer of the i-th transmission line; C i Indicates the probability of failure of the i-th transmission line;

[0033] S2: Establish the equivalent topological structure of the AC-DC hybrid power grid to be identified, and calculate the identification parameters according to the equivalent topological structure, namely: count the failure probability of the transmission line in the power grid to be identified,...

Embodiment 2

[0092] This embodiment provides a weak point identification system for an AC / DC hybrid power grid, including:

[0093] The model building module is used to build a vulnerability index calculation model for identifying weak links in the AC / DC hybrid power grid, namely:

[0094] R ij =1000*C i L(i)U(j)Q ij

[0095] Among them, R ij is the vulnerability index of the power transmission link; U(j) is the voltage ratio of the jth bus node; Q ij Indicates the correlation degree between the i-th transmission line and the j-th bus node; L(i) represents the ratio of the correlation degree of power flow transfer of the i-th transmission line; C i Indicates the probability of failure of the i-th transmission line;

[0096] The equivalent topology module is used to establish the equivalent topology structure of the AC / DC hybrid power grid to be identified;

[0097] The parameter calculation module is used to calculate the identification parameters according to the equivalent topolog...

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Abstract

The invention relates to a weak link identification method and system for an AC-DC hybrid power grid. The method comprises: constructing a vulnerability index calculation model for identifying a weaklink of the AC-DC hybrid power grid; establishing an equivalent topological structure of the to-be-identified AC-DC hybrid power grid; according to the equivalent topological structure, calculating identification parameters, i.e., counting the fault probability of the power transmission line in the power grid to be identified, calculating the ratio of the power flow transfer correlation degree ofeach power transmission line, calculating the voltage ratio of each bus node, and determining the correlation degree of each power transmission line and each bus node; and inputting the identificationparameters into a vulnerability index calculation model, and calculating the vulnerability index of each power transmission link, so the larger the value of the vulnerability index is, the weaker thecorresponding power transmission link is, and then identification of the weak link is achieved.

Description

technical field [0001] The present application belongs to the technical field of smart grid, and in particular relates to a method and system for identifying weak links of an AC / DC hybrid grid. Background technique [0002] Electric power resources are resources that all walks of life need to use today, and it plays a very important role in social development and economic construction. Especially in the two aspects of enterprise production and daily power consumption, there are higher requirements for the reliability of the power grid. The normal operation of the power grid is the safety of the distribution network and whether the enterprise economy can achieve better development. key. [0003] With the continuous development of social economy, the scale of my country's power grid continues to expand, especially the newly developed technical equipment such as UHV and large units, which makes the operation process of the power grid increasingly complicated. Therefore, the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06F30/20G06Q50/06G06F113/04G06F119/02G06F111/08
CPCG06Q10/06393G06F30/20G06Q50/06G06F2113/04G06F2119/02G06F2111/08
Inventor 饶宇飞崔惟李程昊高泽王建波田春笋王骅高昆刘巍方舟潘雪晴刘芳冰李晓萌赵华曹晓璐黎量子
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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