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Ultra-high-order harmonic measurement method based on fixed-frequency asynchronous sampling

A technology of asynchronous sampling and measurement method, applied in measurement devices, measurement of electrical variables, spectrum analysis, etc., can solve the problems of real-time analysis obstacles, high cost, unsuitable for large-scale applications, etc., to achieve the effect of improving real-time monitoring accuracy

Inactive Publication Date: 2020-08-14
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

The existing equipment that meets the requirements is expensive and not suitable for large-scale applications, which hinders real-time analysis

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  • Ultra-high-order harmonic measurement method based on fixed-frequency asynchronous sampling
  • Ultra-high-order harmonic measurement method based on fixed-frequency asynchronous sampling
  • Ultra-high-order harmonic measurement method based on fixed-frequency asynchronous sampling

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Embodiment Construction

[0023] specific implementation plan

[0024] The present invention will be described below through specific embodiments and accompanying drawings. However, the process details of this embodiment are for the purpose of describing this embodiment only. It should be understood that the invention is not limited to the particular embodiments disclosed, but covers all modifications, equivalents, and alternatives falling within the scope of the disclosure. Throughout the description of the figures, the same reference numerals denote the same elements.

[0025] The present invention proposes a method for measuring ultra-high-order harmonics based on fixed-frequency asynchronous sampling. The specific process is as follows figure 1 shown. The sampling frequency of the selected measuring instrument is 409.6kHz.

[0026] filter processing. The measured voltage and current signals are filtered and frequency-divided, and the harmonic components with frequencies lower than 1.5kHz and h...

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Abstract

The invention discloses an ultra-high-order harmonic measurement method based on fixed-frequency asynchronous sampling, and the method comprises the steps: enabling the sampling frequency of a measurement instrument to be 409.6 kHz, carrying out the filtering and frequency division of a measured voltage and current signal, and filtering harmonic components with the frequencies being lower than 1.5kHz and higher than 64 kHz; taking 200ms as a basic measurement window, extracting data of 0-20ms, 80-100ms and 160-180ms, respectively carrying out discrete Fourier analysis, and solving a mean value to serve as an output spectrum analysis result; aggregating the results at a bandwidth of 2kHz, and outputting an aggregated spectrum signal; and performing gapless time window aggregation on the aggregated spectrum signal every 3s, solving a root-mean-square value of the aggregated spectrum signal, and outputting a time-frequency domain processing result. The method has important significance for improving the real-time monitoring precision of the ultra-high-order harmonics, mastering the ultra-high-order harmonic emission condition of a power system and researching the influence and prevention and treatment of the ultra-high-order harmonics.

Description

technical field [0001] The invention belongs to the technical field of power quality analysis, in particular to a method for measuring ultra-high harmonics based on fixed-frequency asynchronous sampling. Background technique [0002] With the power electronics of the distribution network and the access of a high proportion of renewable energy, various power electronic devices have been widely used. At the same time, the switching frequency of power electronic devices is also increasing, resulting in a significant increase in the content of ultra-high harmonics in the power grid, causing new problems in power quality. [0003] Compared with traditional harmonics, ultra-high-order harmonics have obvious wide-frequency domain characteristics, and the spectrum distribution changes dynamically with time. Therefore, real-time monitoring of ultra-high-order harmonics puts higher demands on the sampling frequency and data processing capabilities of test equipment. Require. Existin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/165
CPCG01R23/165
Inventor 陶顺要海江王莹鑫徐永海郭傲
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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