Unlock instant, AI-driven research and patent intelligence for your innovation.

Judgment method of sag causes for power quality

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

Active Publication Date: 2014-08-13
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
View PDF5 Cites 0 Cited by
  • Summary
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

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

[0037] A method for determining the cause of sag for power quality according to the present invention. The method is based on data in a PQView database and a sag feature table derived from the database to determine the cause of sag. The data in the database is It is the effective voltage value of a single event in the database based on PQView, which includes the following steps:

[0038] Step 1. Obtain the effective voltage 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 the interval time;

[0040] Step 3. Calculate the amplitude of the effective value of the three-phase voltage, that is, divide the effective value of the voltage 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 feature table. The oth...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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, and in particular to a method for determining the cause of sag of power quality. Background technique [0002] With the application of precision instruments and complex electronic equipment, users increasingly require high-quality and highly reliable power supplies. 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 have increased. [0003] Power Quality, in a general sense, refers to high-quality power supply, including voltage quality, current quality, power supply quality, and power quality. It can be defined as: voltage, current, or frequency deviation that causes electrical equipment to malfunction or fail to work properly, including frequency deviation, voltage deviation, voltage fluctuation and flicker, three-phase imbalance, temporary or transient overvoltage, Waveform ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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