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A Measuring Method of Harmonic Reactive Power

A measurement method and technology for harmonic components, applied in the field of harmonic reactive power measurement, can solve the problems of low efficiency and accuracy, low measurement accuracy, large amount of calculation, etc., achieve high accuracy, suppress spectrum leakage, calculate Simple process effect

Inactive Publication Date: 2018-08-31
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, when using the Hilbert digital filter to measure asynchronous sampling, there will be large errors and the measurement accuracy is not high. When using the method of FFT interpolation reconstruction based on Hibert transform, there are many steps, the amount of calculation is relatively large, and the efficiency is low. and low precision

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  • A Measuring Method of Harmonic Reactive Power
  • A Measuring Method of Harmonic Reactive Power
  • A Measuring Method of Harmonic Reactive Power

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Embodiment Construction

[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] According to an embodiment of the present invention, the harmonic reactive power measurement algorithm based on Hanning self-convolution window and three-spectral line interpolation, the steps are as follows:

[0033] (1) Construct a p-order discrete Hanning self-convolution window sequence of length N. The self-convolution window sequence is obtained by discrete self-convolution of a Hanning window of length M.

[0034] Spec...

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Abstract

The invention discloses a method for measuring harmonic reactive power, and the method comprises the steps: (1), building a p-order discrete Hamming self-convolution window sequence, wherein the length of the p-order discrete Hamming self-convolution window sequence is H; (2), processing a discrete signal x(n) comprising a harmonic component through employing the obtained p-order discrete Hamming self-convolution window sequence, and obtaining a windowed discrete frequency spectrum; (3), determining the accurate position of a spectral line through employing three-spectral-line interpolation; and (4), obtaining the frequency, amplitude value and phase angle of a harmonic wave through the accurate position, obtained through the former steps, of the spectral line, thereby achieving the direct calculation of reactive power, and completing the measurement of the reactive power. The method provided by the invention can measure the reactive power quickly and precisely, is high in measurement efficiency, reduces the calculation burden, simplifies the steps, and is higher in precision.

Description

Technical field [0001] The invention relates to electric energy measurement technology in the field of electric power automation, in particular to a method for measuring harmonic reactive power. Background technique [0002] Reactive power control is an important measure for power grid energy saving, and it has extremely important significance in improving power quality, reducing network losses, and improving the stability and safety of grid operation. The premise of reasonable reactive power control and compensation is accurate reactive power measurement. At the same time, reactive power is also one of the important indicators to measure the power quality of the power supply system. Therefore, reactive power measurement is of great significance. [0003] With the widespread use of nonlinear loads, the harmonics in the power grid are becoming more and more abundant. There are many methods for harmonic reactive power measurement. For example, Hilbert digital filter can be used for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R21/00
CPCG01R21/003
Inventor 李开成曾麟贾长杰李飞来
Owner HUAZHONG UNIV OF SCI & TECH
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