Flickering real-time calculation method

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

Active Publication Date: 2013-01-16
GUODIAN NANJING AUTOMATION
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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] The following specifically introduces the embodiments of the present invention:

[0020] (1) Set 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 result in the detection process of the detection instrument. For every N points obtained, a probability statistical calculation is performed on x(n).

[0022] Assume the maximum value of the sequence X max <99, the number of decimal points to be retained is 2.

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

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

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

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

[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] After getting an x(n), get a y(n), and the corresponding sort[...

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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 for an online power quality monitoring device. Background technique [0002] Flicker is an important technical indicator in power quality monitoring. It is a phenomenon caused by voltage fluctuations and can reflect voltage fluctuations. Therefore, there are more and more researches on the measurement and calculation of flicker. For the calculation of the probability distribution of instantaneous visual sensitivity in flicker calculation, the currently commonly used methods are piecewise linear interpolation and statistical ordering. According to the IEC recommended flicker measurement method, the instantaneous flicker is calculated every 10 minutes. If the 800Hz sampling frequency is used, the accumulated instantaneous visual sensitivity data will reach 480000 points in 10 minutes. It is difficult to use the above conventional methods in a short time If the calculation is completed within, the real-tim...

Claims

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Application Information

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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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