CN108776281A - Intelligent electric meter and power quality measurement method - Google Patents
Intelligent electric meter and power quality measurement method Download PDFInfo
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- CN108776281A CN108776281A CN201810815254.7A CN201810815254A CN108776281A CN 108776281 A CN108776281 A CN 108776281A CN 201810815254 A CN201810815254 A CN 201810815254A CN 108776281 A CN108776281 A CN 108776281A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The present invention provides a kind of intelligent electric meter and power quality measurement method, the intelligent electric meter includes：Voltage sample module, current sampling module, electric energy metering module and control module；The voltage sample module acquires the three-phase voltage signal of power grid to be measured, and the three-phase voltage signal is sent to the electric energy metering module；The current sampling module acquires the three-phase current signal of power grid to be measured, and the three-phase current signal is sent to the electric energy metering module；The electric energy metering module is filtered enhanced processing to the three-phase voltage signal and the three-phase current signal, and to the control module output voltage continuous data and electric current continuous data；Control module is based on the voltage measurement data and the electric current continuous data is calculated, and obtains power quality data.Reach the power quality for capableing of automatic measurement power grid to be measured, operated without staff to on-site manual, power quality measures more simply and easily technique effect.
Description
Technical field
The present invention relates to intelligent electric meter technical fields, more particularly, to a kind of intelligent electric meter and power quality measurement method.
Background technology
Power quality refers to the quality of electric energy in electric system, including quality of voltage, current quality, power supply quality and electricity consumption
Quality.Ideal electric energy should be the sine wave of ideal symmetrical.Some factors can make waveform deviate symmetrical sine, thus just generate
Power quality problem.
In modern power systems, voltage dip and interruption have become most important power quality problem.Power quality is asked
Topic is easy to cause electrical equipment failure, influences the service life of electrical equipment.
However, traditional power quality measuring apparatus, is usually carried by staff to power grid to be measured, then by working
Personnel's manual measurement, it is more inconvenient to measure.
Invention content
In view of this, the purpose of the present invention is to provide a kind of intelligent electric meter and power quality measurement method, it is existing to alleviate
There is traditional power quality measuring apparatus present in technology, is carried to power grid to be measured, then by staff by staff
Manual measurement measures more inconvenient technical problem.
In a first aspect, an embodiment of the present invention provides a kind of intelligent electric meters, including：Voltage sample module, current sample mould
Block, electric energy metering module and control module；
The sampling end of the voltage sample module is connect with power grid to be measured, the output end of the voltage sample module with it is described
Electric energy metering module connects, the three-phase voltage signal for acquiring power grid to be measured, and the three-phase voltage signal is sent to institute
State electric energy metering module；
The sampling end of the current sampling module is connect with power grid to be measured, the output end of the current sampling module with it is described
Electric energy metering module connects, the three-phase current signal for acquiring power grid to be measured, and the three-phase current signal is sent to institute
State electric energy metering module；
The electric energy metering module is connect with the control module, for the three-phase voltage signal and the three-phase electricity
Stream signal is filtered enhanced processing, and to the control module output voltage continuous data and electric current continuous data；
The control module is calculated for being based on the voltage measurement data and the electric current continuous data, is obtained
Power quality data.
With reference to first aspect, an embodiment of the present invention provides the first possible embodiments of first aspect, wherein also
Including：Communication module；
The communication module is connect with the control module, is used for the electric energy matter under the control of the control module
Amount data are uploaded to server.
With reference to first aspect, an embodiment of the present invention provides second of possible embodiments of first aspect, wherein institute
State the calculating frequency order of magnitude lower of control module described in the sample frequency ratio of voltage sample module and current sampling module.
With reference to first aspect, an embodiment of the present invention provides the third possible embodiments of first aspect, wherein also
Including：Power down protection module；
The power down protection module is connect with the control module, for carrying out power down protection to the control module.
With reference to first aspect, an embodiment of the present invention provides the 4th kind of possible embodiments of first aspect, wherein also
Including：Power module；
The power module is used to power for the electric energy metering module.
Second aspect, the embodiment of the present invention also provide a kind of power quality measurement method, are applied to the intelligent electric meter
In, the method includes：
Obtain the three-phase current data and the three-phase voltage data；
If receiving mode selection command, it is based on the three-phase current data, the three-phase voltage data and default formula
Set calculates power quality data.
In conjunction with second aspect, an embodiment of the present invention provides the first possible embodiments of second aspect, wherein if
Mode selection command selection first group of qualitative data of output, it is described based on the three-phase current data, the three-phase voltage
Data and default formula set calculate power quality data, including：
The sampling time and the equipment same day for obtaining current power quality data source run continuous service duration, collection voltages
Frequency and chip temperature；
Based on the three-phase current data and the three-phase voltage data, according to the company in the default formula set,
It calculates separately three-phase line voltage, three-phase phase voltage virtual value, three-phase effective current, three phases active power, close phase active power, three
Phase reactive power, close phase reactive power, three-phase apparent energy, close phase apparent energy, three-phase activity coefficient, close phase power factor,
The total harmonic wave of three-phase current and the total harmonic wave of three-phase voltage；
Integral operation is carried out to three phases active power, three-phase active energy is obtained, the conjunction phase active power is accumulated
Partite transport is calculated, and obtains closing phase active energy.
In conjunction with second aspect, an embodiment of the present invention provides second of possible embodiments of second aspect, wherein if
Mode selection command selection second group of qualitative data of output, it is described based on the three-phase current data, the three-phase voltage
Data and default formula set calculate power quality data, including：
FFT operations are carried out respectively to the three-phase current data and the three-phase voltage data, obtain fundamental wave and strange
Harmonic content for several times；
Based on the three-phase current harmonic wave and fundamental wave and the three-phase voltage harmonic wave and fundamental wave, three-phase fundamental current is calculated
Value, three-phase odd harmonic current value, three-phase fundamental voltage value and three-phase odd harmonic voltage value；
Based on the three-phase current all-wave and total harmonic value and the three-phase voltage all-wave and total harmonic value, current distortion rate
And voltage distortion rate.
In conjunction with second aspect, an embodiment of the present invention provides the third possible embodiments of second aspect, wherein if
To export third group qualitative data, the power quality data includes the pattern that the mode selection command selects：Described first
Group qualitative data and second group of qualitative data.
In conjunction with second aspect, an embodiment of the present invention provides the 4th kind of possible embodiments of second aspect, wherein institute
The method of stating further includes：
The power quality data being calculated is sent to communication module according to prefixed time interval, so that described logical
The power quality data is uploaded to server by letter module according to prefixed time interval.
The embodiment of the present invention brings following advantageous effect：The embodiment of the present invention acquires electricity to be measured by voltage sample module
The three-phase voltage signal of net, and three-phase voltage signal is sent to the electric energy metering module；Current sampling module acquisition is to be measured
The three-phase current signal of power grid, and three-phase current signal is sent to electric energy metering module；Electric energy metering module is to three-phase voltage
Signal and three-phase current signal are filtered enhanced processing, and to control module output voltage continuous data and electric current stoichiometric number
According to；Control module is based on voltage measurement data and electric current continuous data is calculated, and can obtain power quality data.
The embodiment of the present invention can by connect always power grid to be measured voltage sample module and current sampling module to electricity
Electric signal in net carries out voltage sample and current sample, and the three-phase voltage signal and three-phase current signal obtained according to sampling
Power quality data is calculated, is capable of the power quality of automatic measurement power grid to be measured, is grasped without staff to on-site manual
Make, power quality measures more simple and convenient.
Other features and advantages of the present invention will illustrate in the following description, also, partly become from specification
It obtains it is clear that understand through the implementation of the invention.The purpose of the present invention and other advantages are in specification, claims
And specifically noted structure is realized and is obtained in attached drawing.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment cited below particularly, and coordinate
Appended attached drawing, is described in detail below.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of internal structure schematic diagram of intelligent electric meter provided in an embodiment of the present invention；
Fig. 2 is another internal structure schematic diagram of intelligent electric meter provided in an embodiment of the present invention；
Fig. 3 is a kind of flow chart of power quality measurement method provided in an embodiment of the present invention；
Fig. 4 is another flow chart of power quality measurement method provided in an embodiment of the present invention.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
Traditional power quality measuring apparatus, is usually carried by staff to power grid to be measured, then by staff
Manual measurement, it is more inconvenient to measure, and is based on this, a kind of intelligent electric meter provided in an embodiment of the present invention and power quality measurement side
Method can carry out electricity by the voltage sample module and current sampling module for connecting power grid to be measured always to the electric signal in power grid
Pressure sampling and current sample, and power quality number is calculated in the three-phase voltage signal and three-phase current signal that are obtained according to sampling
According to, be capable of the power quality of automatic measurement power grid to be measured, without staff to on-site manual operate, power quality measurement it is simpler
Folk prescription is just.
For ease of understanding the present embodiment, first to a kind of intelligent electric meter and electric energy disclosed in the embodiment of the present invention
Measurement method describes in detail, as shown in Figure 1, the intelligent electric meter includes：Voltage sample module 11, current sampling module
12, electric energy metering module 13 and control module 14；
The sampling end of the voltage sample module 11 is connect with power grid to be measured, the output end of the voltage sample module 11 with
The electric energy metering module 13 connects, the three-phase voltage signal for acquiring power grid to be measured, and the three-phase voltage signal is sent out
Give the electric energy metering module 13；
The sampling end of the current sampling module 12 is connect with power grid to be measured, the output end of the current sampling module 12 with
The electric energy metering module 13 connects, the three-phase current signal for acquiring power grid to be measured, and the three-phase current signal is sent out
Give the electric energy metering module 13；
The sampling end of the voltage sample module 11 is connect with power grid to be measured, the sampling end of the current sampling module 12 with
Power grid connection to be measured can be convenient for measuring continuing uninterruptedly to carry out, be not necessarily to staff's hand disassembly, measure more simple and convenient.
The electric energy metering module 13 is connect with the control module 14, for the three-phase voltage signal and described three
Phase current signal is filtered enhanced processing, and to 14 output voltage continuous data of the control module and electric current continuous data；
The control module 14 is used to be calculated based on the voltage measurement data and the electric current continuous data, obtains
Power quality data.
As shown in Fig. 2, the intelligent electric meter further includes：Communication module 15, power down protection module 16 and power module 17,
In the embodiment of the present invention, communication module can be down to RS485 communication modules etc.；
The communication module 15 is connect with the control module 14, and being used under the control of the control module 14 will be described
Power quality data is uploaded to server.
The calculating frequency of control module 14 described in the sample frequency ratio of the voltage sample module 11 and current sampling module 12
Rate order of magnitude lower.
The power down protection module 16 is connect with the control module 14, for carrying out power down guarantor to the control module 14
Shield.
The power module 17 is used to power for the electric energy metering module.
The embodiment of the present invention acquires the three-phase voltage signal of power grid to be measured by voltage sample module, and three-phase voltage is believed
Number it is sent to the electric energy metering module；Current sampling module acquires the three-phase current signal of power grid to be measured, and by three-phase current
Signal is sent to electric energy metering module；Electric energy metering module is filtered at amplification three-phase voltage signal and three-phase current signal
Reason, and to control module output voltage continuous data and electric current continuous data；Control module is based on voltage measurement data and electric current
Continuous data is calculated, and power quality data can be obtained.
The embodiment of the present invention can by connect always power grid to be measured voltage sample module and current sampling module to electricity
Electric signal in net carries out voltage sample and current sample, and the three-phase voltage signal and three-phase current signal obtained according to sampling
Power quality data is calculated, is capable of the power quality of automatic measurement power grid to be measured, is grasped without staff to on-site manual
Make, power quality measurement is more simple and convenient, and maintenance cost is low, is responsible for keeping an eye on or operate without personnel after installing, voluntarily
Work.
In another embodiment of the present invention, as shown in figure 3, also providing a kind of power quality measurement method, it is applied to such as
In intelligent electric meter described in previous embodiment, the method includes：
Step S101 obtains the three-phase current data and the three-phase voltage data；
Step S102, if receiving mode selection command, based on the three-phase current data, the three-phase voltage data and
Default formula set calculates power quality data.
In embodiments of the present invention, if the pattern that the mode selection command selects is the first qualitative data, model selection
Instruction can be that server issues, and server can require the electricity of hardware device upload associative mode by mode selection command
Energy qualitative data, it is described that electric energy matter is calculated based on the three-phase current data, the three-phase voltage data and default formula set
Data are measured, including：
The sampling time and the equipment same day for obtaining current power quality data source run continuous service duration, collection voltages
Frequency and chip temperature.
In embodiments of the present invention, the sampling time：The sampling time point for representing current power quality data source is not
Sample duration from start to end.Continuous service duration：It indicates that the operation duration on the day of equipment, 0 point moment are reset, leads to
Ammeter internal control unit is crossed to obtain run time progress stored count.
Based on the three-phase current data and the three-phase voltage data, according to the company in the default formula set,
It calculates separately three-phase line voltage, three-phase phase voltage virtual value, three-phase effective current, three phases active power, close phase active power, three
Phase reactive power, close phase reactive power, three-phase apparent energy, close phase apparent energy, three-phase activity coefficient, close phase power factor,
The total harmonic wave of three-phase current and the total harmonic wave of three-phase voltage；
Integral operation is carried out to three phases active power, three-phase active energy is obtained, the conjunction phase active power is accumulated
Partite transport is calculated, and obtains closing phase active energy.
In embodiments of the present invention, described to be based on if the pattern that the mode selection command selects is the second qualitative data
The three-phase current data, the three-phase voltage data and default formula set calculate power quality data, including：
FFT operations are carried out respectively to the three-phase current data and the three-phase voltage data, obtain fundamental wave and strange
Harmonic content for several times；
Based on the three-phase current harmonic wave and fundamental wave and the three-phase voltage harmonic wave and fundamental wave, three-phase fundamental current is calculated
Value, three-phase odd harmonic current value, three-phase fundamental voltage value and three-phase odd harmonic voltage value；
Based on the three-phase current all-wave and total harmonic value and the three-phase voltage all-wave and total harmonic value, current distortion rate
And voltage distortion rate.
In embodiments of the present invention, if the pattern that the mode selection command selects is output third group qualitative data, institute
Stating power quality data includes：First group of qualitative data and second group of qualitative data.
In practical applications, power quality data can include at least one of data above, specifically include those numbers
According to that can set according to actual needs, the present invention is not construed as limiting.
In another embodiment of the present invention, as shown in figure 4, the method further includes：
The power quality data being calculated is sent to communication module by step S201 according to prefixed time interval,
So that the power quality data is uploaded to server by the communication module according to prefixed time interval, prefixed time interval can
To be arranged according to actual demand, illustratively, prefixed time interval can be 1 second.
Power quality data is referred into server according to prefixed time interval upload by communication module, can be existed convenient for user
The long-range real time inspection of line shows the power quality data that field real-time measurement obtains.
Flow chart and block diagram in attached drawing show the system, method and computer journey of multiple embodiments according to the present invention
The architecture, function and operation in the cards of sequence product.In this regard, each box in flowchart or block diagram can generation
A part for a part for one module, section or code of table, the module, section or code includes one or more uses
The executable instruction of the logic function as defined in realization.It should also be noted that in some implementations as replacements, being marked in box
The function of note can also occur in a different order than that indicated in the drawings.For example, two continuous boxes can essentially base
Originally it is performed in parallel, they can also be executed in the opposite order sometimes, this is depended on the functions involved.It is also noted that
It is the combination of each box in block diagram and or flow chart and the box in block diagram and or flow chart, can uses and execute rule
The dedicated hardware based system of fixed function or action is realized, or can use the group of specialized hardware and computer instruction
It closes to realize.
The computer program product of intelligent electric meter and power quality measurement method that the embodiment of the present invention is provided, including deposit
The computer readable storage medium of program code is stored up, the instruction that said program code includes can be used for executing previous methods and implement
Method described in example, specific implementation can be found in embodiment of the method, and details are not described herein.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description
It with the specific work process of device, can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
In addition, in the description of the embodiment of the present invention unless specifically defined or limited otherwise, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be expressed in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be
People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.
And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic disc or CD.
In the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for the description present invention and simplify description, do not indicate or imply the indicated device or element must have a particular orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for description purposes only, and is not understood to indicate or imply relative importance.
Finally it should be noted that：Embodiment described above, only specific implementation mode of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：Any one skilled in the art
In the technical scope disclosed by the present invention, it can still modify to the technical solution recorded in previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover the protection in the present invention
Within the scope of.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. a kind of intelligent electric meter, which is characterized in that including：Voltage sample module, current sampling module, electric energy metering module and control
Molding block；
The sampling end of the voltage sample module is connect with power grid to be measured, output end and the electric energy of the voltage sample module
Metering module connects, the three-phase voltage signal for acquiring power grid to be measured, and the three-phase voltage signal is sent to the electricity
It can metering module；
The sampling end of the current sampling module is connect with power grid to be measured, the output end of the current sampling module and the electric energy
Metering module connects, the three-phase current signal for acquiring power grid to be measured, and the three-phase current signal is sent to the electricity
It can metering module；
The electric energy metering module is connect with the control module, for believing the three-phase voltage signal and the three-phase current
Number it is filtered enhanced processing, and to the control module output voltage continuous data and electric current continuous data；
The control module is calculated for being based on the voltage measurement data and the electric current continuous data, obtains electric energy
Qualitative data.
2. intelligent electric meter according to claim 1, which is characterized in that further include：Communication module；
The communication module is connect with the control module, is used for the power quality number under the control of the control module
According to being uploaded to server.
3. intelligent electric meter according to claim 1, which is characterized in that the voltage sample module and current sampling module
Calculating frequency order of magnitude lower of the sample frequency than the control module.
4. intelligent electric meter according to claim 1, which is characterized in that further include：Power down protection module；
The power down protection module is connect with the control module, for carrying out power down protection to the control module.
5. intelligent electric meter according to claim 1, which is characterized in that further include：Power module；
The power module is used to power for the electric energy metering module.
6. a kind of power quality measurement method, which is characterized in that be applied to the intelligent electric meter as described in Claims 1-4 is any
In, the method includes：
Obtain the three-phase current data and the three-phase voltage data；
If receiving mode selection command, it is based on the three-phase current data, the three-phase voltage data and default formula set
Calculate power quality data.
7. power quality measurement method according to claim 6, which is characterized in that if mode selection command selection is defeated
Go out first group of qualitative data, it is described to be calculated based on the three-phase current data, the three-phase voltage data and default formula set
Power quality data, including：
The sampling time and the equipment same day for obtaining current power quality data source run continuous service duration, collection voltages frequency
And chip temperature；
Based on the three-phase current data and the three-phase voltage data, according to the company in the default formula set, respectively
Calculate three-phase line voltage, three-phase phase voltage virtual value, three-phase effective current, three phases active power, close phase active power, three-phase without
Work(power closes phase reactive power, three-phase apparent energy, closes phase apparent energy, three-phase activity coefficient, closes phase power factor, three-phase
Current total harmonic and the total harmonic wave of three-phase voltage；
Integral operation is carried out to three phases active power, three-phase active energy is obtained, integral fortune is carried out to the conjunction phase active power
It calculates, obtains closing phase active energy.
8. power quality measurement method according to claim 7, which is characterized in that if mode selection command selection is defeated
Go out second group of qualitative data, it is described to be calculated based on the three-phase current data, the three-phase voltage data and default formula set
Power quality data, including：
FFT operations are carried out respectively to the three-phase current data and the three-phase voltage data, obtain fundamental wave and odd-times
Harmonic content；
Based on the three-phase current harmonic wave and fundamental wave and the three-phase voltage harmonic wave and fundamental wave, three-phase fundamental current value, three are calculated
Phase odd harmonic current value, three-phase fundamental voltage value and three-phase odd harmonic voltage value；
Based on the three-phase current all-wave and total harmonic value and the three-phase voltage all-wave and total harmonic value, current distortion rate and electricity
Press aberration rate.
9. power quality measurement method according to claim 8, which is characterized in that if mode selection command selection
Pattern is output third group qualitative data, and the power quality data includes：First group of qualitative data and second group described
Qualitative data.
10. power quality measurement method according to claim 6, which is characterized in that the method further includes：
The power quality data being calculated is sent to communication module according to prefixed time interval, so that the communication mould
The power quality data is uploaded to server by block according to prefixed time interval.
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| CN109358307A (en) * | 2018-11-21 | 2019-02-19 | 深圳深宝电器仪表有限公司 | A kind of intelligent electric energy meter safety detection circuit and intelligent electric energy meter |
| CN113592189A (en) * | 2021-08-11 | 2021-11-02 | 上海善算科技有限公司 | Industrial energy digital management system |
| CN114325089A (en) * | 2021-12-27 | 2022-04-12 | 杭州万高科技股份有限公司 | Single-phase electric energy metering chip and intelligent thing allies oneself with table based on IR46 standard |
| CN114325089B (en) * | 2021-12-27 | 2024-03-19 | 杭州万高科技股份有限公司 | Single-phase electric energy metering chip and intelligent thing allies oneself with table based on IR46 standard |
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Application publication date: 20181109 |