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A DSP-based wind generating set flicker measurement method

A technology of wind power generators and measurement methods, which is applied to measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve the problems of slow calculation speed, large system resources, and low calculation accuracy, so as to improve speed, simplify algorithms, The effect of improving accuracy

Inactive Publication Date: 2019-04-05
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The analog flicker measurement algorithm and the digital flicker measurement algorithm given by the IEC standard have low calculation accuracy and slow calculation speed, and the finite impulse response digital filter in the existing design takes up a lot of system resources and the algorithm is complicated

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  • A DSP-based wind generating set flicker measurement method
  • A DSP-based wind generating set flicker measurement method
  • A DSP-based wind generating set flicker measurement method

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Embodiment Construction

[0047] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined in the present application.

[0048] In this embodiment, the measurement method provided by the present invention is described and verified in a combination of software and hardware, and the specific implementation is as follows.

[0049] Voltage flicker measurement:

[0050] In this embodiment, a method of simulating voltage fluctuations in a virtual power grid using the current and voltage time series measured at the output end of the wind p...

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Abstract

The invention provides a DSP-based wind generating set flicker measurement method. The DSP-based wind generating set flicker measurement method comprises the following steps that S1, input measured voltage is adapted to a voltage value suitable for an instrument; S2, a signal sequentially passes through a square detection filter, a 0.05-35HZ band pass filter and a visual sensitivity weighting filter and a square sum first-order smoothing mean filter; and S3, statistical analysis of input signal flicker is carried out, wherein the filters used in the step S2 are infinite impact response filters, and a high-order low-pass filter in the 0.05-35HZ bandpass filter is implemented in a cascade of multiple low-order filters. The DSP-based wind generating set flicker measurement method effectivelysolves the problem that the filter coefficient of the high-order filter is too small or even close to zero when the sampling rate is relatively high, thereby improving the accuracy of the flicker measurement and the speed of the measurement to some extent.

Description

technical field [0001] The invention mainly relates to the technical field related to the measurement of the power quality of wind power generators, in particular to a DSP-based flicker measurement method for wind power generators. Background technique [0002] The IEC standard gives the measurement algorithm of the analog flicker meter, which is the simulation of the "light-eye-brain" link recommended by the IEC, that is, a demodulator with a square multiplier, a high-pass filter, a low-pass filter and a weighted Analog design of filters. The input signal of the "light-eye-brain" link is the amplitude modulation wave generated after the signal of a certain frequency modulates the power frequency signal in our country. The function of the "light-eye-brain" link is to convert the modulated amplitude modulation wave into the The flicker frequency (voltage fluctuation component) components are demodulated. The degree of subjective visual response of illuminance fluctuations c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
CPCG01R19/2503
Inventor 孟克其劳司伟勇张占强
Owner INNER MONGOLIA UNIV OF TECH