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Method for computing alternating current component fundamental amplitude value in microcomputer protection

A technology of fundamental wave amplitude and microcomputer protection, which is applied in the calculation of fundamental wave amplitude of AC volume and the calculation of actual fundamental wave amplitude of AC volume, and can solve problems affecting the protection action behavior of the microcomputer part, fundamental wave amplitude error, etc.

Active Publication Date: 2015-05-20
NARI TECH CO LTD +1
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Problems solved by technology

[0015] In order to solve the problem that there is a certain error between the fundamental amplitude of the AC volume and the actual fundamental amplitude of the AC volume in the prior art, the more the frequency offset, the greater the error, and the error of the fundamental amplitude due to the frequency offset will affect the For the problem of the action behavior of the microcomputer part protection, the present invention provides a method for calculating the amplitude value of the fundamental wave of the AC used in the protection of the microcomputer, which can correctly calculate the actual value of the AC volume when the frequency of the fundamental wave of the AC volume is inconsistent with the rated frequency of the power system. The fundamental amplitude of

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  • Method for computing alternating current component fundamental amplitude value in microcomputer protection
  • Method for computing alternating current component fundamental amplitude value in microcomputer protection
  • Method for computing alternating current component fundamental amplitude value in microcomputer protection

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Embodiment Construction

[0031] In the microcomputer relay protection device, data collection and processing are discrete, and the above-mentioned calculation processes are all processed in a discrete method in the relay protection device. The frequency f and fundamental wave amplitude A(f, n) of the AC quantity have been obtained in the microcomputer protection (n is the current sampling point). Therefore, the calculation method for the amplitude of the fundamental wave of the AC in the microcomputer protection is as follows:

[0032] 1. Assuming that the frequency range of the fundamental frequency of the AC volume processed in the microcomputer protection is between 5Hz and 70Hz, for the frequency range of 5Hz to 70Hz, the frequency is discretized at an interval of 0.1Hz, and the Coe( f) and exist in a data table. The i-th data in the data table is the Coe(f) corresponding to the frequency (5+0.1i)Hz. The calculation method of Coe(f) at each discrete frequency f is as follows:

[0033] 1.1) Theor...

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Abstract

The invention discloses a method for computing alternating current component fundamental amplitude value in microcomputer protection, belonging to the microcomputer protection field of a power system, comprising the steps of obtaining the average value of the fundamental amplitude computed by Fourier series in the alternating current component 1 / 2 period, and then multiplying a coefficient related to frequency to obtain the actual fundamental amplitude value of the alternating current component. The method solves the problems in the prior art that as the alternating-current component fundamental amplitude value and the actual fundamental amplitude value of the alternating current component have a certain error caused by frequency shift, the more the frequency shift is, the bigger the error is, and the fundamental amplitude value error caused by the frequency shift can influence the protection action behavior of the microcomputer protection part. The method for computing alternating current component fundamental amplitude value in microcomputer protection can accurately compute the actual fundamental amplitude value of the alternating current component in the condition that the alternating current component fundamental frequency is not uniform with the rated frequency of the power system.

Description

technical field [0001] The invention belongs to the field of microcomputer protection of power systems, and relates to a method for calculating the fundamental wave amplitude of AC used in microcomputer protection, in particular, the fundamental wave amplitude calculated by Fourier series is taken within 1 / 2 cycle of the AC The calculation method of calculating the actual fundamental amplitude of AC by multiplying the average value by a frequency-related coefficient. Background technique [0002] At present, the Fourier series is generally used in computer protection to calculate the fundamental amplitude of the exchange volume. In the microcomputer protection code, the coefficients of the Fourier series are first calculated according to the rated frequency of the power system and the sampling rate of the device and stored in a data table. These coefficients are constant throughout the operation of the microcomputer protection device. If there is a certain deviation betwee...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
Inventor 郑作伟马营江卫良郝后堂庞志军张明群贾秀波
Owner NARI TECH CO LTD
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