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A Three-stage Progressive Fault Screening and Sorting Method for Voltage Stability Evaluation of Large Power Grids

A technology for voltage stabilization and fault screening, applied in electrical components, circuit devices, AC network circuits, etc., to solve problems such as missed selection and insufficient accuracy

Active Publication Date: 2021-09-14
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the simple sensitivity method used in Document 5 is not accurate enough, and there may be cases of missed selection.
Document 6 "Sensitivity Algorithm for Estimating the Voltage Stability Boundary of the System after a Branch Type Accident" (Proceedings of the Chinese Society for Electrical Engineering, Vol. 28, No. 1, Page 18, 2008) proposes an improved sensitivity algorithm to estimate the The voltage stability boundary eliminates the estimation error caused by the simple sensitivity method to a large extent, but there may be cases of missed selection only based on this method

Method used

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  • A Three-stage Progressive Fault Screening and Sorting Method for Voltage Stability Evaluation of Large Power Grids
  • A Three-stage Progressive Fault Screening and Sorting Method for Voltage Stability Evaluation of Large Power Grids
  • A Three-stage Progressive Fault Screening and Sorting Method for Voltage Stability Evaluation of Large Power Grids

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] The present invention proposes a fault screening and sorting technology based on the actual complex large power grid. The idea is as follows: Based on the characteristics of the complex large power grid, fault screening and sorting are performed in a progressive manner. Firstly, the critical branches are identified from the expected fault set by defining the importance index of voltage stability, and the key expected fault set is formed. Then, combined with the sensitivity-based load margin algorithm and the minimum singular value analysis method, serious faults are screened out from the key expected fault set. Finally, the equivalent injection fault continuum power flow is used to identify and sort the unstable faults, and the remaining serious faults are sorted by the improved quadratic curve fitting method.

[0024] The following is ...

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Abstract

The invention discloses a three-stage progressive fault screening and sorting method for off-line voltage stability evaluation of a large power grid, comprising the following steps: in the first stage, pre-screening is performed by defining a voltage stability importance index to form a key expected fault set; In the first stage, the sensitivity-based load margin estimation method and the minimum singular value method are combined to quickly screen out the critical faults from the set of key expected faults. The curve fitting method calculates its stability margin and ranks it. The invention can effectively improve the efficiency of fault screening and sorting, and is suitable for the off-line voltage stability evaluation of large power grids.

Description

technical field [0001] The invention relates to a fault screening and sorting method for voltage stability assessment of a complex large power grid, in particular a three-stage progressive fault screening and sorting method for large power grid voltage stability assessment, which belongs to the technical category of power system stability control. Background technique [0002] With the rapid development of my country's electric power construction, the structure and scale of the power grid are growing day by day, which also puts forward higher requirements for the safe operation of the power grid. The problem of voltage collapse is still one of the main risks faced by the modern power system. Power system stability analysis includes static stability margin calculation, fault hazard assessment and effective measures to improve system stability. The purpose of the fault hazard assessment is to screen out the serious faults that have potential threats to the safe and stable oper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 陈刚黄冠标曾勇刚洪潮张东辉刘蔚蔡东阳
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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