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Harmonic wave sampling calculating method

A sampling calculation and harmonic technology, applied in the field of harmonic sampling calculation, can solve problems such as difficulty in synchronous sampling, high harmonic calculation errors, and a large decrease in measurement accuracy, and achieves good application prospects, high accuracy, and high accuracy. handy effect

Inactive Publication Date: 2016-06-15
浙江共同电子科技有限公司
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Problems solved by technology

[0003] With the increase of the harmonic order, the measurement accuracy of the harmonic analyzer drops more. The reason is that under the current conditions, it is difficult to achieve strict synchronous sampling. Most of the harmonic analyzers manufactured according to the principle of synchronous sampling actually work in a nearly synchronous state
Every small synchronization error of the fundamental wave will bring a large error to the calculation of the higher harmonic

Method used

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Embodiment Construction

[0023] A kind of harmonic sampling calculation method of the present invention, comprises data acquisition, the search of forward zero-crossing point, the calculation of actual acquisition point number N and actual 128-point sampling value A N Four calculation steps, the specific steps are as follows:

[0024] Data acquisition: The microprocessor selected is a single-chip microcomputer 80C196KC. The highest number of harmonics that need to be processed is 31 times. In order to meet the requirements of FFT, 128 points must be sampled at equal intervals in each cycle. Based on the power frequency of 50Hz, the sampling interval is calculated, and the sampling interval is 156.25μs. Regardless of the jitter of the measured signal frequency, by starting the A / D of the 80C196KC, after finding the positive zero-crossing point of the measured signal, start the A / D of the 80C196KC at regular intervals (every 156.25μs), and record the subsequent 136 points of data , so as long as the f...

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Abstract

The invention discloses a harmonic wave sampling calculating method, which comprises four steps: data collection, search of a forward zero crossing point, calculation of the number N of actual collected points, and calculation of an actual 128-point sample value AN. The method is scientific in design, convenient for calculation, high in sample precision, good in use effect, suitable for large-scale application, high in accuracy, and fast in sampling speed, with good application prospect.

Description

technical field [0001] In particular, the present invention relates to a harmonic sampling calculation method. Background technique [0002] With the promotion of energy-saving technology and automation technology, the capacity and quantity of power electronic devices such as converter equipment and frequency conversion equipment are increasing day by day, which makes the high-order harmonics in the power grid more and more serious, which brings great harm to the power system and various users. Electric equipment brings harm, ranging from increasing energy consumption and shortening life, to causing electrical accidents and directly affecting safe production. Therefore, eliminating harmonic pollution and controlling the harmonic content within the allowable range has become the common goal of the competent authorities and power consumers. At present, the harmonic sources in the power system are not only of many types, but also widely distributed. The harmonic current in the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 王涛冯杰姚云委黄志付
Owner 浙江共同电子科技有限公司
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