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Voltage flicker measurement method for power quality measurement instrument

A measuring instrument and technology of voltage flicker, applied in the field of electric power grid, can solve the problem of low measurement accuracy

Active Publication Date: 2016-03-02
MEIZHOU POWER SUPPLY BUREAU OF GUANGDONG POWER GRID CORP
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Problems solved by technology

Therefore, the voltage flicker measurement method of traditional power quality measuring instruments has the disadvantage of low measurement accuracy

Method used

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  • Voltage flicker measurement method for power quality measurement instrument
  • Voltage flicker measurement method for power quality measurement instrument
  • Voltage flicker measurement method for power quality measurement instrument

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Embodiment Construction

[0014] The invention discloses a voltage flicker measurement method of a power quality measuring instrument, which can be used for periodic flicker calculation and random flicker calculation. Such as figure 1 As shown, the above method includes the following steps:

[0015] Step S120: Carry out sliding convolution calculation according to the acquired voltage effective value envelope data and a preset identification function to obtain an identification value. The identification function is set according to the measurement data structure and the national standard requirements, and the identification value is obtained by performing sliding convolution calculation with the acquired voltage RMS envelope data. Specifically, the identification function may be linear and meet the requirement that the identification time difference is greater than 30 mS. In this embodiment, the identification function is: fs(j)={-2, -1, 0, 1, 2}, and the occupation time is 40 mS, which meets the req...

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Abstract

The invention relates to a voltage flicker measurement method for a power quality measurement instrument. According to acquired voltage effective value envelope data and a preset identification function, sliding convolution calculation is carried out to obtain an identification value. When positive and negative changes happen to the identification value, extreme values in a corresponding convolution calculation section and time corresponding to the extreme values are searched and acquired. According to a difference value of each two adjacent extreme values and the time corresponding to the extreme values, a flicker value in a measurement time period is calculated and obtained. The calculation method completely meets a definition that voltage of a power system is influenced by large load random switching by flicker according to a national standard, the method can be used for flicker calculation with periodic changes or random changes, and the measurement accuracy is high.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a method for measuring voltage flicker of a power quality measuring instrument. Background technique [0002] The visual response of the human eye caused by voltage fluctuations that cause unstable light illuminance (light flickering) is called flicker. In other words, flicker reflects the impact of light flicker caused by voltage fluctuations on human visual perception. Voltage flicker is the result of voltage fluctuation and is an important description parameter of power quality standards. [0003] The voltage flicker measurement method of the traditional power quality measuring instrument is calculated according to the calculation method recommended by the national standard before the 2000 edition. When measuring a stable period signal, due to the truncation of the non-complete period, the measurement calculation error is mostly above 10%. The flicker is mostly an unstabl...

Claims

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Application Information

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IPC IPC(8): G01R19/12
Inventor 梁敬韩金尅梁江东韩雄辉邹练辉杨志强黄志刚潘文博廖明黄乐黄建文张建涛冯文晴丘仕锋
Owner MEIZHOU POWER SUPPLY BUREAU OF GUANGDONG POWER GRID CORP
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