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Fuzzy evaluation method of voltage sags

A voltage sag, fuzzy evaluation technology, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve problems such as failure to consider compatibility

Inactive Publication Date: 2010-01-13
JIANGSU ELECTRIC POWER RES INST +1
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Problems solved by technology

[0005] The voltage sag assessment methods that have been formulated abroad are either considered from the power supply system side (such as South African standards), or from sensitive equipment (such as ITIC curve, SEMI F47 curve), or from the power supply side (low voltage ride-through of wind farms in various countries) standard), failed to consider the compatibility between several

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Embodiment Construction

[0018] The present invention will be further explained below in conjunction with the drawings.

[0019] figure 1 It is the membership function of the input variable in the present invention. In the step 1), although the national standard does not yet have a voltage sag related standard, in the IEC61000 series of standards and the standards of European and American countries, voltage sag is an important electric energy Quality index, because this index relates to the power supply reliability and technical and economic benefits of precision manufacturing companies and high-tech industries. The voltage sag standards considered from sensitive equipment include the ITIC curve and the SEMI F47 curve; the standards considered from the power supply system include the South African standard NRS 048-2: 2003. Integrate NRS 048-2: 2003, ITIC curve and SEMI F47 curve, my country's wind farm low voltage ride through requirements into the same voltage sag duration-residual voltage plane, and es...

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Abstract

The invention discloses a fuzzy evaluation method of voltage sags, which is characterized by comprising the following steps: (1) establishing an input variable membership function by using a turnoff of a standard curve as a basis according to an SAPP voltage sag standard NRS 048-2:2003, a standard ITIC curve of the American Information Technology Industry Council, a standard SEMI F47 curve of a semiconductor equipment manufacturer international organization and the low voltage ride through requirements of wind power plants of various regions; (2) making an inference rule by combining input variables and determining that each pair of the input variables correspond to a unique output; (3) zoning a voltage sag retained voltage-duration planar graph according to an output rule and establishing an output membership function by combining a voltage sag energy index; and (4) carrying out a defuzzication calculation according to a mass center theory and outputting a voltage sage fuzzy evaluation result. The fuzzy evaluation method of voltage sags can accurately and objectively reflect the integrated influence of the voltage sags on a power supply system and sensitive equipment.

Description

Technical field [0001] The invention relates to a voltage sag fuzzy evaluation method, which is used to study the voltage sag interference level of each power quality monitoring point in a power system, and belongs to the technical field of power system power quality. Background technique [0002] The problem of power quality is an interdisciplinary and borderline subject, and it is also an extremely serious problem faced by the electric power sector and its consumers for a long time to come. The research on transient power quality problems started late, and has just been recognized in China. It belongs to the extension of steady-state power quality problems, with a small impact, but the consequences are more serious; the essence of transient power quality problems is transient voltage quality problems , Or the power grid is attacked by external interference and internal faults, and the system impact caused by operation. Its main performance indicators are: voltage pulse, surge, ...

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Application Information

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IPC IPC(8): G01R19/00
Inventor 袁晓冬顾伟雷刚
Owner JIANGSU ELECTRIC POWER RES INST
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