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A real-time calculation method for flicker

A real-time calculation and flickering technology, applied in the measurement of electrical variables, measuring devices, instruments, etc., can solve problems such as the real-time problem of instantaneous visual sensitivity data, and achieve real-time statistical calculation, real-time mastery, and real-time quality monitoring. Effect

Active Publication Date: 2015-08-26
GUODIAN NANJING AUTOMATION
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AI Technical Summary

Problems solved by technology

[0003] In order to solve the real-time problem of the calculation of instantaneous visual sensitivity data in the existing flicker calculation technology, the present invention provides a flicker calculation method that satisfies both accuracy and real-time performance

Method used

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Embodiment Construction

[0019] Embodiments of the present invention are described in detail below:

[0020] (1), let x(n)=f(n), 0≤n≤N, 0≤x(n)≤X max .

[0021] x(n) is a discrete floating-point number sequence, which represents the intermediate calculation results in the testing process of the testing instrument. Every time N points are obtained, a probability statistics calculation is performed on x(n).

[0022] Assuming the maximum value of the sequence X max <99, the number of decimal places to be reserved is 2.

[0023] (2), set y(n)=x(n)*10 2 , 0≤n≤N. y(n) is defined as the set of integers.

[0024] Then 0≤y(n)≤9999. Then the integer set y(n) corresponding to x(n) is obtained.

[0025] (3) Set a group of integer arrays sort[count], count=10000.

[0026] (4) In the actual calculation, the device calculates a point x(n) every time it takes a sample.

[0027] When n=0, the sort[count] array is cleared.

[0028] y(0)=x(0)*10 2 , sort[y(0)]=sort[y(0)]+1;

[0029] Every time an x(n) is obta...

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Abstract

The invention discloses a flickering real-time calculation method which is used in flickering measurement and calculation of an electric energy quality on-line monitoring device. The flickering real-time calculation method comprises the following steps of: measuring flickering transient visibility data, and setting the data to be floating point numbers which are more than zero to form a measured data floating point number set; multiplying each floating point number in the measured data floating point number set with a coefficient to obtain a group of measured data integer sets; setting a group of statistical numbers; zeroing every element in the statistical number group, traversing the measured data integer sets, and once an integer is obtained, adding 1 to corresponding variables in the statistical number group; and after a traversing process is finished, obtaining the probability of the flickering transient visibility data. By the quick flickering calculation method, real-time calculation of flickering measurement can be finished; flickering indexes can be mastered in real time; and the power supply quality of a power grid can be monitored in real time.

Description

technical field [0001] The invention relates to a flicker calculation method of an online power quality monitoring device. Background technique [0002] Flicker is an important technical index in power quality monitoring. It is a phenomenon caused by voltage fluctuations and can reflect voltage fluctuations. Therefore, there are more and more studies on the measurement and calculation of flicker. For the calculation of the probability distribution of instantaneous visual sensitivity in flicker calculation, the commonly used methods are piecewise linear interpolation method and statistical sorting method. According to the flicker measurement method recommended by IEC, instantaneous flicker is calculated every 10 minutes. If the sampling frequency is 800Hz, the accumulated instantaneous visual sensitivity data within 10 minutes will reach 480,000 points. It is difficult to use the above conventional methods in a short time. If the calculation is completed within a certain per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 刘爱民郑有余肖碧涛郑龙文
Owner GUODIAN NANJING AUTOMATION
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