An Interpolation Sampling Value Protection Method Adaptive to Frequency Variation
A sampling value protection, frequency change technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of not being able to adapt to the frequency of AC volume, achieve good application prospects, fast action speed, and eliminate motion blur zone effect
Active Publication Date: 2017-08-25
NARI TECH CO LTD
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[0004] Purpose: In order to overcome the deficiencies in the prior art, the sampling value protection in the prior art can not adapt to the change of the frequency of the exchange volume, the present invention provides an interpolation type sampling value protection method that can adapt to the frequency change, through the The period of the sinusoidal AC volume is measured in real time, and the data window is automatically adjusted in real time according to the measurement result of the AC volume cycle, so that the performance of the protection is not affected by the frequency of the AC volume, and at the same time it can eliminate the fuzzy area of the movement. It has high action precision, fast speed, It is characterized by high reliability, especially suitable for occasions where the frequency of AC volume changes in a large range, and has a good application prospect
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[0038] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0039] An interpolation sampling value protection method that can adapt to frequency changes proposed by the present invention uses a fixed sampling time interval Δt for sampling, uses an interpolation algorithm to generate virtual zero-crossing sampling values, and uses the period T of the sinusoidal AC volume i For real-time measurements, the data window t w Automatically cycle T according to the exchange volume i Real-time dynamic adjustment, calculate data window t w Cumulative time t for inner sampling value greater than zero h , and then calculate the K value, and judge whether the protection is activated by comparing the K value with the fixed value. The specific flow chart is as follows figure 1 As shown, the implementation steps are as follows:
[0040] The first step is to set the setting value of the interpolation sampling value ...
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The invention discloses an interpolation type sampling value protection method that can adapt to frequency changes. For the input sinusoidal AC signal, sampling is performed at a fixed sampling time interval Δt, and an interpolation algorithm is used to generate a virtual zero-crossing sampling value, and then the sinusoidal AC signal is The data window tw of the interpolation sampling value protection is automatically adjusted in real time according to the AC volume cycle Ti, and the cumulative time th of the sampling value in the data window tw is greater than zero, and then the K value is calculated. The value is compared with the fixed value to determine the action behavior of the protection. The invention solves the problem that the traditional sampling value protection cannot work normally when the signal frequency seriously deviates from the power frequency, so that the performance of the sampling value protection is not affected by the frequency of the AC volume, and at the same time, it can eliminate the action fuzzy area of the sampling value protection, and has action accuracy It has the characteristics of high speed, fast action speed and high reliability, and is especially suitable for occasions where the frequency of AC volume changes in a large range, and has a good application prospect.
Description
technical field [0001] The invention relates to an interpolation type sampling value protection method capable of adapting to frequency changes, and belongs to the technical field of relay protection of electric power systems. Background technique [0002] Sampling value protection is a special protection form of microcomputer protection, which directly uses discrete instantaneous sampling values to form protection criteria. The traditional sampling value protection generally follows the "R and S rule". The basic principle is: take a data window of continuous R points, and judge each point in the data window. If there are S points in the data window that meet the action conditions, it is considered Is a fault, action exit. However, the traditional sampling value protection has the disadvantage of a large motion blur area, and the accuracy of the motion threshold is not high. In order to improve the action accuracy of sampling value protection, interpolation sampling valu...
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IPC IPC(8): G06F19/00
Inventor 江卫良郑作伟郝后堂马营李延新陆源
Owner NARI TECH CO LTD