Power grid temporary splitting method and system for blocking multi-direct-current commutation failure linkage

A commutation failure, multi-DC technology, applied in AC network circuits, power transmission AC networks, electrical components, etc., can solve problems such as limited effect of suppressing fault propagation, re-investment, and failure to give full play to the benefits of the three lines of defense in the power grid system. Achieving optimal clustering results and easy-to-obtain results

Active Publication Date: 2020-08-25
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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  • Power grid temporary splitting method and system for blocking multi-direct-current commutation failure linkage
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  • Power grid temporary splitting method and system for blocking multi-direct-current commutation failure linkage

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Embodiment 1

[0041] In one or more embodiments, a method for formulating a grid temporary disassembly strategy to block the chain of commutation failures among multiple DCs is disclosed, which is aimed at temporarily weakening the mutual influence between DC systems and inhibiting commutation when a fault occurs. The propagation of phase failure between DC. The main implementation steps of the method are as follows:

[0042] (1) Quantitatively evaluate the mutual influence of commutation failures among multiple DCs. According to subsequent modeling and solution requirements, reference or improve related quantitative indicators. For example, directly refer to the multi-infeed interaction factor (MIIF) to define the closeness index, or transform on the basis of MIIF, the design can evaluate the distance index of the distance between DC systems.

[0043] (2) Combining graph theory, map the DC system to the vertices in the graph, and use the quantitative relationship (distance or tightness) of th...

Embodiment 2

[0104] In one or more embodiments, a temporary power grid disassembly system for resisting multi-DC chain commutation failure is disclosed, including:

[0105] It is used to design a device that can evaluate the mutual influence of commutation failures between multiple DCs and quantify the relationship between multiple DCs;

[0106] A device used to map multiple DCs into points in the graph, describe the relationship between the DCs with the connections between the points and their weights, and construct an association graph containing multiple DCs;

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

[0108] A device used to solve the above-mentioned graph-cutting mathematical model by using a clustering algorithm, and to obtain a temporary power grid splitting strategy on the basis of comprehensively evaluating the effects of multiple clustering algorithms.

[0109] The specific implementation process of the above device is the same as the...

Embodiment 3

[0111] In one or more embodiments, a terminal device is disclosed, including a server, the server including a memory, a processor, and a computer program stored on the memory and running on the processor, and the processor executes the The program implements the temporary power grid disassembly method that blocks the chain of multi-DC commutation failures in the first embodiment. For the sake of brevity, I will not repeat them here.

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Abstract

The invention discloses a power grid temporary splitting method and system for blocking multi-direct-current commutation failure linkage. The method comprises the steps of designing an index which canevaluate the mutual influence of commutation failures among a plurality of direct currents, and carrying out the quantification of the mutual relation among the plurality of direct currents; mappingthe plurality of direct currents into points in the graph, describing a mutual relation between the direct currents by connecting lines between the points and weights of the connecting lines, and constructing an incidence relation graph containing the plurality of direct currents; based on the association relationship graph, establishing a graph cutting mathematical model; and solving the graph cut mathematical model by adopting a clustering algorithm, and obtaining a power grid temporary splitting strategy on the basis of comprehensively evaluating the effects of various clustering algorithms. According to the invention, starting from weakening the mutual influence of a multi-direct-current system through an alternating-current power grid, the risk of a novel cascading failure caused by commutation failure of multiple direct currents is reduced by means of the operation means of temporary disconnection of the power grid, and the problem of formulating a temporary disconnection strategy, namely the problem of answering disconnection among the direct currents, is mainly solved.

Description

Technical field [0001] The present invention relates to the technical field of blocking commutation failure interlocking between multiple direct currents, and in particular to a method and system for temporarily disassembling power grids for blocking intermittent commutation failure interlocking of multiple direct currents. 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, the thyristor-based grid-commutated HVDC transmission technology (LCC-HVDC) has the possibility of commutation failure. If multiple LCC-HVDC projects constructed in different periods are connected to the same AC power grid, and the distance between converter stations is close, it may trigger a new type of cascading failure characterized by multiple DC successive commutation failures or even lockouts. This is because: when LCC-HVDC works, it needs ...

Claims

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Application Information

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Patent Type & Authority Applications(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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