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Method and system for temporary unloading of power grid to block multi-DC commutation failure chain

A commutation failure and multi-DC technology, applied to AC network circuits, power transmission AC networks, electrical components, etc., can solve the limited effect of suppressing fault propagation, not fully utilizing the benefits of the three lines of defense of the power grid system, and not proposing a strategy formulation method And other issues

Active Publication Date: 2021-07-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is not a grid-level strategy, and has limited effect on suppressing fault propagation among multiple DCs
Some scholars proposed to install fault current limiter (FCL) in the AC system. When a fault occurs, multiple DC systems are isolated from each other through the fault current limiter to avoid the chain propagation problem of commutation failure. However, the installation Fault current limiters require reinvestment
More importantly, none of the previous studies have resisted cascading failures between multiple DCs at the level of the power grid system, or have not proposed a specific strategy formulation method, and have not given full play to the existing "three lines of defense" framework system of the power grid system benefits

Method used

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  • Method and system for temporary unloading of power grid to block multi-DC commutation failure chain
  • Method and system for temporary unloading of power grid to block multi-DC commutation failure chain
  • Method and system for temporary unloading of power grid to block multi-DC commutation failure chain

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Embodiment 1

[0041] In one or more embodiments, a method for formulating a temporary decoupling strategy of the power grid that blocks commutation failure chains between multiple DC systems is disclosed, aiming at temporarily weakening the mutual influence between DC systems when a fault occurs, and inhibiting commutation. Propagation of phase failures between DCs. The main implementation steps of the method are as follows:

[0042] (1) Quantitatively evaluate the degree of mutual influence of commutation failures among multiple DCs. According to subsequent modeling and solution requirements, reference or improve relevant quantitative indicators. For example, the multi-infeed interaction factor (MIIF) is directly used to define the closeness index, or the MIIF is transformed to design an alienation index that can evaluate the degree of mutual alienation between DC systems.

[0043](2) Combining with graph theory, the DC system is mapped to the vertices in the graph, and the quantitative ...

Embodiment 2

[0104] In one or more embodiments, a system for temporarily unloading a power grid against multi-DC cascading commutation failures is disclosed, including:

[0105] A device for designing indicators that can evaluate the mutual influence of commutation failures between multiple DCs, and quantifying the interrelationships between multiple DCs;

[0106] A device for mapping multiple direct currents into points in the graph, describing the interrelationships between the direct currents with the lines between the points and their weights, and constructing an association graph containing multiple direct currents;

[0107] A device for establishing a graph cut mathematical model based on the association graph;

[0108] The device is used to solve the above-mentioned graph-cutting mathematical model by adopting a clustering algorithm, and obtain a temporary uncoupling strategy of the power grid on the basis of comprehensively evaluating the effects of various clustering algorithms. ...

Embodiment 3

[0111] In one or more embodiments, a terminal device is disclosed, including a server, the server includes a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor executes the The program realizes the grid temporary disconnection method of blocking multiple DC commutation failure chains in the first embodiment. For the sake of brevity, details are not repeated here.

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Abstract

The present invention discloses a method and system for temporarily decoupling a power grid that blocks multiple direct current commutation failure chains. Quantification; multiple direct currents are mapped to points in the graph, and the relationship between the direct currents is described by the connection between the points and their weights, and an association relationship diagram containing multiple direct currents is constructed; based on the association relationship diagram, the establishment Graph-cut mathematical model: use clustering algorithm to solve the above-mentioned graph-cut mathematical model, and based on the comprehensive evaluation of the effects of various clustering algorithms, a temporary grid separation strategy is obtained. Starting from weakening the mutual influence of multiple DC systems through the AC power grid, the present invention reduces the risk of commutation failure and new cascading failures of multiple DC systems through the operation means of temporary decoupling of the power grid, and focuses on solving the problem of formulating the temporary decoupling strategy, namely Answer the question between which DCs to decouple.

Description

technical field [0001] The invention relates to the technical field of blocking commutation failure chains between multiple direct currents, and in particular to a temporary disconnection method and system for power grids that block multiple direct current commutation failure chains. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] In terms of working principle, there is a possibility of commutation failure in the thyristor-based grid commutation HVDC transmission technology (LCC-HVDC). If multiple LCC-HVDC projects constructed in different periods are connected to the same AC grid, and the distance between the converter stations is relatively close, it may also trigger a new type of cascading fault characterized by multiple DC commutation failures or even blocking. This is because: when LCC-HVDC works, it needs to rely on the AC voltage o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/36
CPCH02J3/00H02J3/36Y02E60/60
Inventor 王晓辉白宇高峰
Owner SHANDONG UNIV
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