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Dislocation analysis weighting method capable of improving interharmonic calculation accuracy

A technology of calculation accuracy and weighting method, which is applied in the field of dislocation analysis weighting method, can solve the problems of different calculation accuracy and technical details of harmonics and inter-harmonics, and achieve low detection accuracy, improved calculation accuracy, and accurate amplitude and phase effects

Inactive Publication Date: 2014-09-24
SHENZHEN ARTEL TECH
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Problems solved by technology

[0005] After meeting the above conditions, each manufacturer still has different technical details, which is also a main reason for the different calculation accuracy of harmonics and inter-harmonics of different manufacturers

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  • Dislocation analysis weighting method capable of improving interharmonic calculation accuracy
  • Dislocation analysis weighting method capable of improving interharmonic calculation accuracy
  • Dislocation analysis weighting method capable of improving interharmonic calculation accuracy

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings.

[0013] figure 1 It shows the principle flowchart of the misalignment analysis weighting method that can improve the calculation accuracy of interharmonics according to the present invention, as shown in figure 1 As shown, the dislocation analysis weighting method that can improve the calculation accuracy of interharmonics includes the following steps:

[0014] Step 1: According to Calculate the interharmonic value S1 of the first group of 10 cycles; where X' i =FFT(i,i+9),X' i+1 =FFT(i+1,i+1+9); X(i,i+1) represents the interharmonic value of the first group of 10 cycles, X' i Indicates a set of interharmonic values ​​obtained by FFT decomposition and calculation of the i-th cycle to the i+9th cycle, X' i+1 Represents another group of inter-harmonic values ​​obtained by FFT decomposition and calculation of the i+1th cycle to the i+1+9th cycle; α and β represent X′...

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Abstract

The invention discloses a dislocation analysis weighting method capable of improving interharmonic calculation accuracy. The method comprises the following steps of: firstly calculating the interharmonic value of one group containing 10 cycles through FFT (fast Fourier transform), then backwards deviating the 10 cycles contained in the group by one cycle, further calculating the interharmonic value of another group containing 10 cycles after the one-cycle deviation through the FFT, then performing weighted averaging on the interharmonic values of the two groups, and obtaining the result which is called as the interharmonic value of the first group of the 10 cycles; and sequentially calculating the interharmonic values of the second group, the third group till the nth group of the 10 cycles according to the method. According to the dislocation analysis weighting method capable of improving the interharmonic calculation accuracy, the new result is obtained by improvement and weighting on the basis of the result obtained by traditional FFT decomposition, so that the problem that the existing interharmonic parameter detection accuracy is lower is solved, and interharmonic amplitude and phase can be calculated more accurately by adopting the method when a variety of harmonics and interharmonics exist simultaneously.

Description

technical field [0001] The invention relates to a detection method for an intermediate harmonic used in power quality analysis and a power monitoring system, in particular to a dislocation analysis weighting method that can improve the calculation accuracy of the inter-harmonic. Background technique [0002] Power quality, also called power quality, power quality, etc., is manifested as problems caused by deviations from ideal values ​​such as voltage, current, and frequency. Harmonics and interharmonics are one type of power quality problems. Harmonics are spectral components whose frequency is an integer multiple of the power frequency, and interharmonics are components whose frequency is a non-integer multiple of the power frequency. Harmonics and inter-harmonics are one of the most prominent problems in power quality. The harm of harmonics and inter-harmonics is relatively large. The main performance is to reduce the utilization rate of power equipment, make electrical ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
Inventor 王瑞莫景贤
Owner SHENZHEN ARTEL TECH