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Judgment method of sag causes for power quality

A technology of power quality and discrimination method, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., and can solve problems such as imperfect monitoring methods

Active Publication Date: 2012-05-30
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coupled with imperfect monitoring methods, operation, external interference and various faults, etc., power quality problems have become increasingly prominent

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] The present invention will be further described below.

[0037] A kind of sag reason discrimination method that is used for power quality of the present invention, this method is based on the data in the database of a PQView and the sag characteristic table drawn from this database to carry out the discrimination of sag reason, the data in the database For the voltage RMS value of a single event in the PQView-based database, the following steps are included:

[0038] Step 1, obtain the voltage effective value of a single event in the database based on PQView;

[0039] Step 2, take the duration cycle of this single event, and calculate the number of points per cycle according to its interval time;

[0040] Step 3, calculate the amplitude of the three-phase voltage effective value, that is, divide the voltage effective value by the rated voltage;

[0041] Step 4, calculate the amplitude of the three-phase voltage, the amplitude of the sag phase is obtained from the sag ...

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Abstract

The invention discloses a judgment method of sag causes for power quality. The judgment method comprises the following steps of: acquiring a voltage effective value of a single event; acquiring the duration cyclic wave of the single event, and calculating the points in each cycle according to time intervals; calculating the amplitude of a three-phase voltage effective value; calculating the amplitude of a three-phase voltage; calculating the value of A; calculating the value of B; calculating the value of C; calculating the value of D; and determining the sag causes by rules. According to the judgment method, the data in the conventional PQView-based database are used, the sag cause judgment required by the power quality is realized through the data in the database, and scientific basis for decision-making can be provided for the management of the power quality of electric power companies for.

Description

technical field [0001] The invention relates to the field of power quality, in particular to a method for judging the cause of sags in power quality. Background technique [0002] With the application of precision instruments and complex electronic equipment, users are increasingly demanding high-quality and high-reliability power supply. In recent years, with the introduction and application of foreign advanced equipment and the development of the electronics industry, abnormalities caused by power quality problems are increasing. [0003] Power Quality, generally speaking, refers to high-quality power supply, including voltage quality, current quality, power supply quality and power quality. It can be defined as: the deviation of voltage, current or frequency that causes electrical equipment to fail or fail to work normally, including frequency deviation, voltage deviation, voltage fluctuation and flicker, three-phase unbalance, temporary or transient overvoltage, Wavefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 奚永巍董瑞安张丽莹张孝根何维国张宇
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO