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A method for fast measurement and system protection of AC power

A technology for system protection and power consumption, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve problems such as high cost, high requirements for measuring instrument configuration, and low protection accuracy, so as to improve accuracy, reduce hardware overhead and cost, The effect of algorithm simplification

Active Publication Date: 2019-05-17
广州市隆星科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing AC power measurement and system protection usually use Fourier transform algorithm (Fourier operation), and need to use high-speed ADC (analog-to-digital conversion chip), DSP (digital signal processor) and CPU multi-chip cooperative processing, because In the existing measurement and protection algorithm, the effects of the AC quantities of other harmonics other than the fundamental wave on the electrical appliances are eliminated, resulting in low protection accuracy, and the actual protection accuracy can only reach 5%. Moreover, because the existing algorithm needs to use Multiple computing and processing modules have high requirements for the configuration of measuring instruments and high cost

Method used

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Embodiment 1

[0027] figure 1 A schematic flow chart of an embodiment of a method for rapid measurement of AC power and system protection provided by an embodiment of the present invention, including steps:

[0028] 101. Sampling the value of the AC power and calculating the frequency of the AC power;

[0029] In the embodiment of the present invention, in order to realize the fast and accurate measurement of the AC power, the value of the target AC power is first sampled, and the frequency of the AC power is calculated and analyzed, so as to do the early stage for the subsequent acquisition of the AC power sampling value of each cycle. Prepare.

[0030] In the embodiment of the present invention, the foregoing purpose is achieved by the CPU, that is, the CPU samples the value of the AC power, and obtains the frequency value of the power.

[0031] 102. According to the frequency of the AC power, perform multiple samplings on the AC power of each cycle to obtain multiple sampling values; ...

Embodiment 2

[0040] figure 2 It is a schematic flow chart of another embodiment of a method for rapid measurement of AC power and system protection provided by the embodiment of the present invention, including steps:

[0041] 201. Sampling the value of the AC power and calculating the frequency of the AC power;

[0042] In this embodiment, the content of step 201 is the same as that of step 101 in embodiment 1, and will not be repeated here.

[0043] 202. According to the frequency of the AC power, perform 32n data sampling on the AC power of each cycle to obtain multiple sampling values; where n=1, 2, 3, 4..., n is a natural number greater than 0;

[0044] After the frequency of the target AC power is obtained, multiple cycles are selected according to the frequency, and data sampling is performed 32n times for each cycle of the AC power to obtain multiple sampling values, where n=1, 2, 3, 4 ..., n is a natural number greater than 0.

[0045] 203. Obtain the mean square value of elec...

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Abstract

The embodiment of the invention discloses an alternating-current electric quantity rapid measurement and system protection method. The method comprises the steps of: (1) sampling alternating-current electric quantity values and calculating the frequency of the alternating-current electric quantity; (2) according to the frequency of the alternating-current electric quantity, carrying out multi-sampling on the alternating-current electric quantity of each cycle, and obtaining a plurality of sampling values; (3) carrying out mean square operation on the plurality of obtained sampling values of each cycle, and obtaining an electric quantity mean square value; and (4) comparing the obtained electric quantity mean square value with a square value of a preset electric quantity constant value, if the electric quantity mean square value is larger than the square value of the preset electric quantity constant value, controlling the execution of corresponding system protection logics, and if not, returning to the step (3) and continuing measurement and operation. Compared with the prior art, the measurement and protection precision is improved, the configuration requirement of a measuring instrument is lowered, and the cost of the operation process is lowered.

Description

technical field [0001] The invention relates to the field of AC power measurement and application protection, in particular to a method for fast measurement of AC power and system protection. Background technique [0002] The existing AC power measurement and system protection usually use Fourier transform algorithm (Fourier operation), and need to use high-speed ADC (analog-to-digital conversion chip), DSP (digital signal processor) and CPU multi-chip cooperative processing, because In the existing measurement and protection algorithm, the effects of the AC quantities of other harmonics other than the fundamental wave on the electrical appliances are eliminated, resulting in low protection accuracy, and the actual protection accuracy can only reach 5%. Moreover, because the existing algorithm needs to use Multiple computing and processing modules have high requirements for the configuration of measuring instruments and high cost. [0003] Therefore, how to provide an AC po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R22/06
CPCG01R22/06
Inventor 贾景龙
Owner 广州市隆星科技股份有限公司