Method for frequency calculation in alternating current sampling of feeder terminal
A technology of AC sampling and frequency calculation, applied in the direction of frequency measurement device, etc., can solve the problem of difficult implementation of signal filtering, and achieve the effect of omitting frequency locking circuit and filter circuit, accurate grid frequency, and strong anti-interference ability.
Inactive Publication Date: 2020-03-10
QINGDAO TOPSCOMM COMM
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Problems solved by technology
Conventional hardware frequency calculation methods are affected by cost constraints and harmonic interference, and it is very difficult to implement filtering after the signal passes through the frequency locking circuit, so it is necessary to develop a stable and low-cost frequency calculation method
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[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, so as to specifically illustrate the technical solution of the present invention. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0021] A method for frequency calculation in feeder terminal AC sampling, comprising the following steps,
[0022] Step 1, after the current sampling is finished, the AC sampling data is filtered to extract the fundamental wave signal.
[0023] Step 2. Determine whether it is a sampling point polluted by noise. If the current sampling falls at the positive zero crossing point, perform software oversampling processing between the positive and negative zero crossing points. Assume that the sampling point between two consecutive noise-free sampling points The value changes linearly. First, take the mi...
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The invention discloses a method for frequency calculation in alternating current sampling of a feeder terminal. The method comprises the steps of first, carrying out filtering on alternating currentsampling data to extract a fundamental wave signal; second, determining the relatively accurate position of a zero crossing point through alternating current sampling; third, performing the calculation in the second step at the positive zero-crossing position of each cyclic wave, and accumulating oversampling counts; and fourth, carrying out alternating current sampling and signal processing, fundamental wave extraction and frequency correction in AD interruption of a single-chip microcomputer, and when the acquired data volume is accumulated to a certain quantity, carrying out a task of calculating the frequency of a power grid according to the accumulated cache data by the program front end. The high-precision software calculation of the frequency of the power grid is implemented according to an algorithm of successive approximation of the zero-crossing linear difference of the alternating current sampling data.
Description
technical field [0001] The invention relates to the field of distribution network automation systems, and relates to a frequency calculation method in feeder terminal AC sampling. Background technique [0002] With the development of science and technology, along with the continuous innovation of distribution network automation technology, a variety of distribution terminal equipment is constantly being updated, no matter from hardware design or algorithm innovation. In recent years, with the continuous improvement of the intelligence level of the national grid, people have higher and higher requirements for power distribution equipment. are getting more and more attention. In the field of power distribution terminals, Feeder Terminal Unit (FTU), as a distribution automation equipment integrating collection, monitoring and control, is widely used in the upgrading and transformation of distribution network automation systems. Data monitoring is a basic function of FTU, and ...
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Login to View More IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 张亚南周学治陈景峰郑鑫商玉玺董永波
Owner QINGDAO TOPSCOMM COMM