CN202486308U - Harmonic electric quantity measuring system - Google Patents
Harmonic electric quantity measuring system Download PDFInfo
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- CN202486308U CN202486308U CN2012201264978U CN201220126497U CN202486308U CN 202486308 U CN202486308 U CN 202486308U CN 2012201264978 U CN2012201264978 U CN 2012201264978U CN 201220126497 U CN201220126497 U CN 201220126497U CN 202486308 U CN202486308 U CN 202486308U
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Abstract
The utility model discloses a harmonic electric quantity measuring system. The harmonic electric quantity measuring system comprises a signal modulation circuit, a filter circuit, an analog-to-digital converter, a double-port random access memory (RAM) and a central processing unit (CPU) which are all connected in sequence. The harmonic electric quantity measuring system further comprises a voltage transducer and an electric current transducer which are connected with the signal modulation circuit; a memorizer, a keyboard, a display screen, a universal serial bus (USB) interface, a serial communication interface and a reset circuit which are connected with the CPU; a complex programmable logic device (CPLD) which is respectively connected with the analog-to-digital converter and the double-port RAM; a hardware synchronous circuit which is connected with the signal modulation circuit and the CPLD; and a hardware clock which is connected with the hardware synchronous circuit. By means of the harmonic electric quantity measuring system, a sum of harmonic electric quantity can be acquired by calculating each harmonic electric quantity 1-64 times, whether harmonic waves produced by users influence power supply volume is affected greatly, whether a multifunctional watt-hour meter with the function of calculating harmonic component electric energy needs to be arranged for users who produce the harmonic waves without exceeding a provision of national standard GB/T14549-1993 power quality public power grid harmonic wave according to measured data can be determined, and line loss can be reduced.
Description
Technical field
The utility model relates to a kind of harmonic wave electricity measuring system.
Background technology
Along with urban track traffic, high ferro, frequency conversion control technique development and widespread use, the non-linear factor of electrical network load is increasingly high.Nonlinear load can produce a large amount of harmonic waves and inject electrical network; Make the voltage and current waveform generation in the electric system seriously distort; Not only electric power system is polluted, power-supply unit is constituted harm, and the non-linear customer that produces harmonic wave is converted into harmonic electric energy with a part of fundamental energy of its absorption; Cause power supply enterprise's line loss to increase, the non-profit-making cost of electric power operation enterprise increases.Be necessary to study the electric energy metrical mode under the harmonic effects for this reason, accurate to guarantee electric energy metrical, ensure the operating cost of electric power operation enterprise.
The present electric energy metrical of electric energy meter is the foundation of electric system charge.The electric energy meter of installing and using at present is generally the full electronic electric energy meter, and its major function is a metering first-harmonic electricity.In electrical network, flow to regardless of harmonic wave, when harmonic load flowed to electrical network, actual was after load is passed through filtering with the first-harmonic in the electrical network, the anti-electrical network of sending back to of the harmonic current of formation.The full electronic electric energy meter carries out algebraic addition with the harmonious wave source of the active energy of the first-harmonic of load consumption to the harmonic wave active energy of electrical network foldback; Make that the energy of record is also littler than the meritorious electric weight of the first-harmonic of load consumption, this is the weak point on the full electronic voltameter measuring principle.A kind of common electric energy meter of employing is by the electromagnetic induction moment that rotates in addition, measures with the number of turns that rotating disk changeed, and measuring accuracy is low but cost is also low.
Existing research shows, to same stoichiometric point, when harmonic wave surpasses the GB regulation, adopts other full electronic electric energy meter of identical class of accuracy and common electric energy meter, and the metering electric flux has than big difference; To the electrical load user of generation higher hamonic waves such as great power conversion circuit equipment, electric arc furnaces, in order only to write down the first-harmonic active energy that load consumes, it is more reasonable to use with other full electronic electric energy meter of class of accuracy with common electrical magnetic-type electric energy meter ratio.But no matter the electromagnetic type electric energy meter still is the full electronic electric energy meter, and the error in dipping under the harmonic wave operating mode is all bigger.The multi-function watt-hour meter that has metering harmonic component electric energy at present is to the optimal selection of harmonic wave than the accurate measurement of large user's ability, but this gauging table cost is high, expensive, should not popularize.Have only when the harmonic content that detect the user to have had influence on the metering situation, and, just should select for use this multi-function watt-hour meter to measure benefit that this multi-function watt-hour meter with metering harmonic component electric energy obtains being installed when being higher than its cost.
Non-linear customer sends harmonic power as harmonic source, not only electrical network is worked the mischief, and has also handed over the electricity charge simultaneously less.Therefore, concerning power supply enterprise, when selecting only electric energy meter metering electric weight for use, is the problem that needs solve.When detecting harmonic wave, only the total percent harmonic distortion of voltage, each harmonic voltage containing ratio and each harmonic electric current permissible value were analyzed in the past, ignored research, so be difficult to address the above problem to harmonic electric energy.
Summary of the invention
The purpose of the utility model is a kind of harmonic wave electricity measuring system, through calculate 1-64 each harmonic wave electricity obtain the harmonic wave electric weight and.From harmonic wave electricity angle; Through each harmonic electricity and the total electric weight of each harmonic are come analysis user harmonic wave electric weight; To analyzing line loss significant meaning is arranged, thereby select different electric energy meter metering electric weight for use, ensure the operating cost of electric power operation enterprise according to condition of different.
The technical scheme that realizes above-mentioned purpose is:
A kind of harmonic wave electricity measuring system; The voltage sensor that comprise successively the signal modulation circuit, filtering circuit, A/D converter, dual port RAM (random access memory) and the CPU (central processing unit) that connect, is connected said signal modulation circuit respectively and current sensor, the storer that is connected respectively with said CPU, keyboard, display screen, USB (USB) interface, serial communication interface are with reset circuit, be connected CPLD (the Complex Programmable Logic Device of said A/D converter and dual port RAM respectively; CPLD), connect said signal modulation circuit and the hardware synchronous circuit of CPLD and the hardware clock that is connected this hardware synchronous circuit, wherein:
Said signal modulation circuit is modulated the electric current of the voltage and current sensor acquisition of voltage sensor collection, and the signal after will modulating divides two-way to transmit:
One the tunnel passes to said CPLD when passing to said CPU through filtering circuit filter, A/D converter, dual port RAM successively;
Another road is transferred to said CPLD through hardware synchronous circuit;
Said CPLD and CPU carry out sharing with mutual of data through dual port RAM, successively through FFT (Fast Fourier Transform (FFT)) computing and electric flux computing, obtain 1-64 each harmonic electricity and harmonic wave electric weight and, and deposit the gained data in dual port RAM.
Above-mentioned harmonic wave electricity measuring system, wherein, said serial communication interface is RS485 interface or RS232 interface.
The beneficial effect of the utility model is: the utility model can not only carry out the computing of frequency analysis harmonic power; The total percent harmonic distortion of voltage, each harmonic voltage containing ratio and each harmonic electric current permissible value are analyzed; Also through calculate 1-64 each harmonic wave electricity and harmonic wave electric weight with; To analyzing line loss significant meaning is arranged, thereby quick diagnosis goes out the error of used electric energy meter metering under the harmonic wave operating mode.Determine whether to adopt other electric energy meters or other forms of metering method according to above-mentioned analysis result; For power supply enterprise increases the benefit; The loss that minimizing brings because of non-linear customer ensures the operating cost of electric power operation enterprise, and bigger economical and practical type is arranged; And, reduce the line loss amount for the improvement harmonic wave provides foundation.
Description of drawings
Fig. 1 is the structural drawing of the harmonic wave electricity measuring system of the utility model;
Embodiment
To combine accompanying drawing that the utility model is described further below.
See also Fig. 1; The harmonic wave electricity measuring system of the utility model; Storer 8, keyboard 9, display screen 10, usb 11, serial communication interface 12 and the reset circuit 13 that comprises successively voltage sensor 6 that the signal modulation circuit 1 that connects, filtering circuit 2, A/D converter 3, dual port RAM 4 be connected signal modulation circuit 1 with CPU5, respectively and current sensor 7, is connected respectively with CPU5, respectively be connected A/D converter 3 and dual port RAM 4 CPLD14, be connected the hardware synchronous circuit 15 of signal modulation circuit 1 and CPLD14 and the hardware clock 16 of connection hardware synchronizing circuit 15, wherein:
The electric current that the voltage and current sensor 7 that signal modulation circuit 1 is gathered voltage sensor 6 is gathered is modulated; And the signal after will modulating divides two-way to transmit: the one tunnel gives filtering circuit 2 elimination harmonic waves; Convert digital signal to through A/D converter 3 then, pass to CPLD14 when this digital signal is passed to CPU5 through dual port RAM 4; Another road is transferred to CPLD14 through hardware synchronous circuit 15;
CPLD14 links to each other with A/D converter 3, and the signal that CPLD14 is received or sends carries out mould/number conversion;
CPLD14 and CPU5 carry out sharing with mutual of data through dual port RAM 4; Through FFT computing and electric flux computing, wherein FFT refers to Fast Fourier Transform (FFT), thereby obtains 1-64 each harmonic electricity successively; Obtain then the harmonic wave electric weight with, and deposit the gained data in dual port RAM 4; The staff can according to the 1-64 each harmonic electricity that obtains and harmonic wave electric weight with, quick diagnosis goes out the error of used electric energy meter metering under the harmonic wave operating mode, thereby determines whether to adopt other electric energy meters or other forms of metering method; For example; Original full electronic electric energy meter that adopts measures; Existing through detection obtain the harmonic wave electric weight with; According to this harmonic wave electric weight and the loss of finding to cause because of the metering reason, be far longer than the cost of multi-function watt-hour meter with metering harmonic component electric energy, therefore select for use multi-function watt-hour meter to measure then immediately;
Storer 8 is outside extendible storer; Keyboard 9 is realized man-machine interaction with display screen 10;
Serial communication interface 12 is RS485 interface or RS232 interface, and usb 11 is realized native system and outside communicating by letter with serial communication interface 12; Reset circuit 13 is used for CPU5 is resetted; Hardware synchronous circuit 15 is used for synchronous clock to CPLD14 being provided with hardware clock 16.
In sum; The utility model is not only analyzed the total percent harmonic distortion of voltage, each harmonic voltage containing ratio and each harmonic electric current permissible value, also through calculate 1-64 each harmonic electricity and harmonic wave electric weight with, thereby go out the error of used electric energy meter metering under the harmonic wave operating mode according to quick diagnosis as a result; Determine whether to adopt other electric energy meters or other forms of metering method; For power supply enterprise increases the benefit, reduce the loss that brings because of non-linear customer, bigger economical and practical type is arranged; And, reduce the line loss amount for the improvement harmonic wave provides foundation.
Above embodiment only supplies to explain the usefulness of the utility model; But not to the restriction of the utility model; The technician in relevant technologies field under the situation of spirit that does not break away from the utility model and scope, can also make various conversion or modification; Therefore all technical schemes that are equal to also should belong to the category of the utility model, should be limited each claim.
Claims (2)
1. harmonic wave electricity measuring system; It is characterized in that; The voltage sensor that comprise successively the signal modulation circuit, filtering circuit, A/D converter, dual port RAM and the CPU that connect, is connected said signal modulation circuit respectively and current sensor, the storer, keyboard, display screen, USB interface, serial communication interface and the reset circuit that are connected respectively with said CPU, respectively be connected said A/D converter and dual port RAM CPLD, be connected the hardware synchronous circuit of said signal modulation circuit and CPLD and the hardware clock that is connected this hardware synchronous circuit, wherein:
Said signal modulation circuit is modulated the electric current of the voltage and current sensor acquisition of voltage sensor collection, and the signal after will modulating divides two-way to transmit:
One the tunnel passes to said CPLD when passing to said CPU through filtering circuit filter, A/D converter, dual port RAM successively;
Another road is transferred to said CPLD through hardware synchronous circuit;
Said CPLD and CPU carry out sharing with mutual of data through dual port RAM, successively through FFT computing and electric flux computing, obtain 1-64 each harmonic electricity and harmonic wave electric weight and, and deposit the gained data in dual port RAM.
2. harmonic wave electricity measuring system according to claim 1 is characterized in that, said serial communication interface is RS485 interface or RS232 interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201264978U CN202486308U (en) | 2012-03-19 | 2012-03-19 | Harmonic electric quantity measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201264978U CN202486308U (en) | 2012-03-19 | 2012-03-19 | Harmonic electric quantity measuring system |
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| Publication Number | Publication Date |
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| CN202486308U true CN202486308U (en) | 2012-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012201264978U Expired - Lifetime CN202486308U (en) | 2012-03-19 | 2012-03-19 | Harmonic electric quantity measuring system |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030943A (en) * | 2018-06-15 | 2018-12-18 | 绍兴市上虞电力电容器有限公司 | A kind of voltage harmonic method for continuous measuring based on ATT7022C |
| CN112730975A (en) * | 2020-12-28 | 2021-04-30 | 国网黑龙江省电力有限公司电力科学研究院 | Electric quantity metering system and network loss evaluation system realized by adopting same |
| CN113922377A (en) * | 2021-09-10 | 2022-01-11 | 国网河北省电力有限公司保定供电分公司 | Anti-harmonic device |
-
2012
- 2012-03-19 CN CN2012201264978U patent/CN202486308U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030943A (en) * | 2018-06-15 | 2018-12-18 | 绍兴市上虞电力电容器有限公司 | A kind of voltage harmonic method for continuous measuring based on ATT7022C |
| CN112730975A (en) * | 2020-12-28 | 2021-04-30 | 国网黑龙江省电力有限公司电力科学研究院 | Electric quantity metering system and network loss evaluation system realized by adopting same |
| CN113922377A (en) * | 2021-09-10 | 2022-01-11 | 国网河北省电力有限公司保定供电分公司 | Anti-harmonic device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121010 |