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
CN108565852AActive Publication Date: 2018-09-21ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
Publication Date
2018-09-21

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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.
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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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