CN205958645U - Measure two -way smart electric meter of fundamental wave and harmonic respectively - Google Patents

Abstract

The utility model specifically relates to a bidirectional smart electric meter for separately measuring fundamental waves and harmonics, and belongs to the technical field of power grid harmonic measurement. A two-way smart meter for separately measuring fundamental waves and harmonics includes a voltage transformer, a current transformer, a first low-pass filter, a second low-pass filter, a fundamental wave cycle length measurement module, an A/D converter, and a single-chip microcomputer , comparator, LCD display and communication chip.

Description

A kind of Bidirectional intelligent ammeter measuring fundamental wave harmonic respectively

Technical field

This utility model is specifically related to a kind of Bidirectional intelligent ammeter measuring fundamental wave harmonic respectively, belongs to mains by harmonics meter Amount technical field.

Background technology

Intelligent electric meter is the intelligent terminal of intelligent grid, except possess the function of measuring of traditional electric energy meter basic electricity with Outward, in order to adapt to the use of intelligent grid and new forms of energy, intelligent electric meter also has two-way multiple rate function of measuring, user side control The intelligentized functions such as function processed, the bidirectional data communication function of plurality of data transmission modes, anti-stealing electricity function, intelligent electric meter generation The developing direction of following energy-conserving intelligent electrical network end user's intelligent terminal by table.

Nonlinear-load analysis in system is more complicated, and it not only absorbs fundamental wave and harmonic power, and can be by wherein one Part fundamental wave and harmonic electric energy are converted into extra harmonic electric energy injected system.If only from the point of view of metering, for non-thread Property user, using all-wave measure beneficial with respect to using fundamental wave metering method.But non-linear customer creates harmonic wave, and thus make The harm of other users equipment in paired systems.Therefore from the point of view of harmonics restraint, measure fundamental wave electricity harmonic respectively Electricity, and certain punitive charge is carried out according to harmonic electric quantity, will be more reasonable for supplier of electricity and other users.This side Face needs practical e measurement technology to support to analyze the source of harmonic wave, is on the other hand also required to generally acknowledge rational theoretical analysis method To judge harmonic contributions problem.At present, these two aspects there is no breakthrough.

For the latter's harmonic contributions problem, processed the principle that power quality problem is in line with " whose pollution, who administers " in the past, For a user, produce harmonic contribution degree to distribution to determine according to individual consumer.The method having many is such as passed through wink Between cut-off some loads, now measurement distribution harmonics level is come determining the size of this contribution degree.Experience have shown that this measurement The result that method obtains is inaccurate, because the running status of other user or load switches continuous.Additionally, current electric power is public The improvement situation of the problem to the harmonic effects distribution network electric energy quality that individual consumer produces for the department is not enough.For Utilities Electric Co., Ensure to supply within the scope of harmonic wave produced by electrical network should be limited in national Specification and provide the user high-quality electricity Can running environment.The intelligent electric meter therefore studying two-way harmonic wave metering is conducive to determining user or load to harmonic wave distribution composition Percentage contribution, and then determine different rewards and punishments schemes for different user.

Utility model content

Utility model purpose：The problem that this utility model is directed to above-mentioned prior art presence makes improvement, and that is, this practicality is new The purpose of type is to disclose a kind of Bidirectional intelligent ammeter measuring fundamental wave harmonic respectively.

Technical scheme：A kind of Bidirectional intelligent ammeter measuring fundamental wave harmonic respectively, including：

Voltage transformer, for becoming to be suitable for the input voltage required for A/D converter the photovoltaic conversion of electrical network alternating current；

Current transformer, for being converted to the input current required for suitable A/D converter by the electric current of electrical network alternating current；

First low pass filter, its input is connected with the outfan of described voltage transformer, is used for filtering harmonic component Obtain the fundametal compoment of the voltage of electrical network alternating current；

Second low pass filter, its input is connected with the outfan of described current transformer, is used for filtering harmonic component Obtain the fundametal compoment of the electric current of electrical network alternating current；

Primitive period linear measure longimetry module, its input is connected with the outfan of described first low pass filter, for surveying Amount primitive period length produces pulse control signal simultaneously；

A/D converter, its input respectively with described voltage transformer outfan, described current transformer outfan, institute State the outfan of the first low pass filter, the outfan of described second low pass filter, described primitive period linear measure longimetry module Outfan be connected, for analog voltage and analog current are converted into digital voltage and digital current；

Single-chip microcomputer, its input is connected with the outfan of described A/D converter, for measuring total electricity of load consumption respectively Energy and fundamental energy；

Comparator, its input is connected with the outfan of described single-chip microcomputer, for compare single-chip microcomputer output total electric energy and Fundamental energy signal, draws the harmonic component that user consumes；

LCD display, its input is connected with the outfan of described single-chip microcomputer, the outfan of described comparator respectively,

Communication chip, its input is connected with the outfan of described single-chip microcomputer.

Further, the input voltage required for described suitable A/D converter is 0～5V.

Beneficial effect：A kind of Bidirectional intelligent ammeter of the fundamental wave harmonic of metering respectively disclosed in this utility model has following Beneficial effect：

1st, because the harmonic electric energy of measurement is more accurate, intelligent electric meter of the present utility model is scheduling and the planning of power department Design provides to be instructed；

2nd, these measurement data can by the Internet+form send into high in the clouds, carry out resource-sharing；

3rd, it is that the power marketing data of power department makees reference, degree can be measured to linear user and non-linear according to harmonic wave User formulates different rewards and punishments measures.

Brief description

Fig. 1 is a kind of structural representation frame of the Bidirectional intelligent ammeter of the fundamental wave harmonic of metering respectively disclosed in this utility model Figure；

Wherein：

1- voltage transformer 2- current transformer

3-A/D transducer 4- single-chip microcomputer

5- the first low pass filter 6- the second low pass filter

7- primitive period linear measure longimetry module 8- comparator

9- communication chip 10-LCD display screen

Specific embodiment：

Below specific embodiment of the present utility model is described in detail.

Specific embodiment 1

As shown in figure 1, a kind of Bidirectional intelligent ammeter measuring fundamental wave harmonic respectively, including：

Voltage transformer 1, for becoming the input electricity being suitable for required for A/D converter 3 by the photovoltaic conversion of electrical network alternating current Pressure；

Current transformer 2, for being converted to the input electricity required for suitable A/D converter 3 by the electric current of electrical network alternating current Stream；

First low pass filter 5, its input is connected with the outfan of voltage transformer 1, is used for filtering harmonic component and obtains Fundametal compoment to the voltage of electrical network alternating current；

Second low pass filter 6, its input is connected with the outfan of current transformer 2, is used for filtering harmonic component and obtains Fundametal compoment to the electric current of electrical network alternating current；

Primitive period linear measure longimetry module 7, its input is connected with the outfan of the first low pass filter 5, for measuring Primitive period length produces pulse control signal simultaneously；

A/D converter 3, its input respectively with voltage transformer 1 outfan, current transformer 2 outfan, the first low pass The outfan of wave filter 5, the outfan of the second low pass filter 6, the outfan of primitive period linear measure longimetry module 7 are connected, and use In analog voltage and analog current are converted into digital voltage and digital current；

Single-chip microcomputer 4, its input is connected with the outfan of A/D converter 3, for measuring total electric energy of load consumption respectively And fundamental energy, wherein always electric energy includes fundamental energy harmonic electric energy, and harmonic electric energy includes the harmonic wave that electrical network produces to load Electric energy and the harmonic electric energy of nonlinear load generation；

Comparator 8, its input is connected with the outfan of single-chip microcomputer 4, for comparing total electric energy and the base of single-chip microcomputer 4 output Ripple electric power signal, draws the harmonic component that user consumes；

LCD display 10, its input is connected with the outfan of single-chip microcomputer 4, the outfan of comparator 8 respectively,

Communication chip 9, its input is connected with the outfan of single-chip microcomputer 4.

Further, the input voltage required for suitable A/D converter 3 is 0V.

Specific embodiment 2

Roughly the same with specific embodiment 1, differing only in the input voltage required for suitable A/D converter 3 is 5V.

Specific embodiment 3

Roughly the same with specific embodiment 1, differing only in the input voltage required for suitable A/D converter 3 is 2.5V.

Above embodiment of the present utility model is elaborated.But this utility model is not limited to above-mentioned enforcement Mode, in the ken that art those of ordinary skill possesses, can also be without departing from this utility model ancestor Make a variety of changes on the premise of purport.

Claims (2)

1. a kind of Bidirectional intelligent ammeter of the fundamental wave harmonic of metering respectively is it is characterised in that include：

Voltage transformer, for becoming to be suitable for the input voltage required for A/D converter the photovoltaic conversion of electrical network alternating current；

Current transformer, for being converted to the input current required for suitable A/D converter by the electric current of electrical network alternating current；

First low pass filter, its input is connected with the outfan of described voltage transformer, is used for filtering harmonic component and obtains The fundametal compoment of the voltage of electrical network alternating current；

Second low pass filter, its input is connected with the outfan of described current transformer, is used for filtering harmonic component and obtains The fundametal compoment of the electric current of electrical network alternating current；

Primitive period linear measure longimetry module, its input is connected with the outfan of described first low pass filter, for measurement base Period of wave, length produced pulse control signal simultaneously；

A/D converter, its input respectively with described voltage transformer outfan, described current transformer outfan, described The outfan of one low pass filter, the outfan of described second low pass filter, described primitive period linear measure longimetry module defeated Go out end to be connected, for analog voltage and analog current are converted into digital voltage and digital current；

Single-chip microcomputer, its input is connected with the outfan of described A/D converter, for measure respectively load consumption total electric energy and Fundamental energy；

Comparator, its input is connected with the outfan of described single-chip microcomputer, for comparing total electric energy and the fundamental wave of single-chip microcomputer output Electric power signal, draws the harmonic component that user consumes；

LCD display, its input is connected with the outfan of described single-chip microcomputer, the outfan of described comparator respectively,

Communication chip, its input is connected with the outfan of described single-chip microcomputer.

2. a kind of Bidirectional intelligent ammeter of fundamental wave harmonic of metering respectively according to claim 1 is it is characterised in that described Input voltage required for suitable A/D converter is 0～5V.