Feed line terminal metering method capable of filtering rest direct current components in alternating current samples

Abstract

The invention discloses a feed line terminal metering method capable of filtering rest direct current components in alternating current samples. The method comprises following steps of step 1, establishing a direct current filter difference equation; step 2, according to filter principles and the difference equation, deriving a filtering algorithm; step 3, by using a single chip microcomputer to carry out digitalization processing, and according to sampling principles, carrying out sampling at equal intervals on to-be-acquired alternating current simulation quantities so as to acquire a discrete signal sequence; and step 4, deploying an alternating current sampling and signal processing and filtering algorithm in AD interruption of the single chip microcomputer, wherein when the acquired data quantity is accumulated to a certain quantity, a program front end can carry out periodical task or second task calculation according to the accumulated buffering data, and calculates effective values of voltage and current, power grid frequency, power parameters and related electrical parameters. Before measurement, rest direct current filtering is performed on each phase of voltage and current obtained through alternating current acquisition, so effects on measurement imposed by direct current components are eliminated, so AD interruption metering is achieved.

Description

technical field [0001] The invention relates to the field of distribution network automation systems, and relates to a feeder terminal metering method capable of filtering out residual DC components in 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 smart meters and 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. Co...

AI Technical Summary

Problems solved by technology

And in the actual distribution network application, the DC component corresponding to each instantaneous sampling point is not consistent, if it is filtered according to a constant, a new error will be introduced

The existing methods cannot solve the above problems. Therefore, it is necessary to develop an adaptive filtering algorithm, which can calculate according to the current sampling value, obtain the DC component corresponding to the current value and filter it out, and improve the sampling accuracy. At the same time, develop and realize the matching The software metering method of the electric terminal also urgently needs to be solved

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