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Three-stage progressive fault screening and sorting method for large grid voltage stability assessment

A technology of voltage stability and fault screening, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as insufficient accuracy and missing selection, and achieve the effects of improving accuracy, reducing calculation time, and reducing calculation amount

Active Publication Date: 2018-09-21
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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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

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  • Three-stage progressive fault screening and sorting method for large grid voltage stability assessment
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  • Three-stage progressive fault screening and sorting method for large grid voltage stability assessment

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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 large grid off-line voltage stability assessment. The method comprises the steps that at the first stage, pre-screening is carried out by defining a voltage stability importance index to form a key expected fault set; at the second stage, a sensitivity-based load margin estimation method and a minimum singularvalue method are combined to quickly select serious faults from the key expected fault set; and at the third stage, unstability faults are identified through fault-type continuous power flow, and a conic fitting method is used to calculate the stability margin of other serious faults and sort the other serious faults. According to the invention, the efficiency of fault screening and sorting can be effectively improved, and the method is suitable for large grid off-line voltage stability assessment.

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...

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Application Information

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Patent Type & Authority Applications(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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