CN112730975A - Electric quantity metering system and network loss evaluation system realized by adopting same - Google Patents
Electric quantity metering system and network loss evaluation system realized by adopting same Download PDFInfo
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- CN112730975A CN112730975A CN202011589144.7A CN202011589144A CN112730975A CN 112730975 A CN112730975 A CN 112730975A CN 202011589144 A CN202011589144 A CN 202011589144A CN 112730975 A CN112730975 A CN 112730975A
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- 238000003869 coulometry Methods 0.000 claims 2
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- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
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Abstract
Electric quantity metering system and adopt the network loss evaluation system that this metering system realized belongs to smart power grids technical field. The problem of current electric quantity metering device can't measure the real electric quantity under the harmonic influence fast is solved. The microprocessor is used for processing the three-phase current signals and the three-phase voltage signals which are received in real time after digital-to-analog conversion to obtain fundamental wave power and subharmonic power at each moment, summing the fundamental wave power and the three-phase voltage signal fundamental wave power at each moment, taking the sum as the total power transmission power at the moment, and obtaining the electric transmission quantity within the preset time according to the total power transmission power at each moment. The method is mainly used for measuring the electric quantity and evaluating the influence of harmonic factors on the network loss.
Description
Technical Field
The invention belongs to the technical field of intelligent power grids, and particularly relates to an intelligent electric quantity measurement and grid loss evaluation system.
Background
In the operation process of the power system, each harmonic component is injected into the power grid by a harmonic source and is superposed on the fundamental wave, which not only forms a potential threat to the pollution of the power grid and the safe, stable and reliable operation of the power system, but also influences the accuracy of electric energy measurement, especially has great influence on the evaluation and calculation of the grid loss, and brings economic loss to power operation enterprises.
At present, electric meters of various models applied and produced on the market mostly only have active and reactive metering functions in the aspect of power, only adopt corresponding processing methods for voltage and current signals, ensure that the measuring accuracy can not be influenced by higher harmonics, but not measure fundamental waves and harmonics independently, and cause the accuracy of electric quantity metering to be low. The electric energy meter with the harmonic wave metering function can only measure each harmonic wave, does not have the function of metering the sum of the total power of each harmonic wave, cannot rapidly meter the real electric quantity under the influence of the harmonic wave, and cannot realize the evaluation of the network loss due to the influence of the harmonic wave. Therefore, the above problems need to be solved.
Disclosure of Invention
The invention aims to solve the problem that the existing electric quantity metering device cannot quickly meter the real electric quantity under the influence of harmonic waves; the invention provides an electric quantity metering system and a network loss evaluation system realized by adopting the metering system.
The electric quantity metering system comprises a current acquisition module 1, a voltage acquisition module 2, a signal conditioning module 3, a digital-to-analog conversion module 4, a microprocessor 5, a storage module 6, a display control module 7 and a communication module 8;
the current acquisition module 1 acquires three-phase current signals on the power transmission line in real time and uploads the acquired three-phase current signals to the signal conditioning module 3;
the voltage acquisition module 2 acquires three-phase voltage signals on the power transmission line in real time and uploads the acquired three-phase voltage signals to the signal conditioning module 3;
the signal conditioning module 3 is used for preprocessing the received three-phase current signals and three-phase voltage signals and sending the preprocessed three-phase current signals and three-phase voltage signals to the digital-to-analog conversion module 4;
the digital-to-analog conversion module 4 is used for performing digital-to-analog conversion on the received preprocessed three-phase current signals and three-phase voltage signals and sending the converted three-phase current signals and three-phase voltage signals to the microprocessor 5;
the microprocessor 5 is used for processing the three-phase current signals and the three-phase voltage signals which are received in real time and subjected to digital-to-analog conversion to obtain fundamental wave power and each subharmonic power at each moment, summing the fundamental wave power and the fundamental wave power of the three-phase voltage signals at each moment, taking the summation result as the total power transmission power at the moment, and obtaining the electric transmission quantity within the preset time according to the total power transmission power at each moment;
the microprocessor 5 is further used for storing the fundamental wave power, the subharmonic power and the transmission electric quantity within the preset time at each moment into the storage module 6; the power control module is also used for displaying the fundamental power and the subharmonic power at each moment through the display control module 7;
the microprocessor 5 is also used for calling data information from the storage module 6;
the display control module 7 is also used for displaying the information input from the outside;
the communication module 8 is further configured to upload the fundamental wave power, the sub-harmonic power, and the transmission power within the preset time, which are obtained by the microprocessor 5 at each time, to the remote terminal 10.
Preferably, the metering system further comprises a power module 9;
and the power supply module 9 is used for supplying power to the current acquisition module 1, the voltage acquisition module 2, the signal conditioning module 3, the digital-to-analog conversion module 4, the microprocessor 5, the storage module 6, the display control module 7 and the communication module 8.
The network loss evaluation system realized by adopting the electric quantity metering system comprises two sets of electric quantity metering systems and a remote terminal 10;
the two sets of electric quantity metering systems are respectively arranged at two ends of the power transmission line;
and the remote terminal 10 is used for obtaining the line loss of the power transmission line according to the difference value of the transmission electric quantity output by the two sets of electric quantity metering systems within the preset time, so that the power grid loss is metered.
Preferably, the remote terminal 10 further counts an average value of each harmonic power of each set of electric quantity metering system in a preset time period, and compares the average value of each harmonic power of each set of electric quantity metering system in the preset time period with a preset harmonic power threshold, thereby implementing the level evaluation of the influence of the harmonic content on the power grid loss.
The invention has the beneficial effects that the electric quantity metering system and the network loss evaluation system realized by adopting the metering system can respectively measure and calculate the fundamental wave electric quantity and the harmonic wave electric quantity caused by injecting the harmonic component generated by the load into the power grid, and can quickly and accurately meter the real electric quantity under the influence of the harmonic wave. During specific application, the electric quantity metering system can be installed at the inlet wire of the industrial and mining enterprise load to carry out bidirectional metering, main nodes and factors influencing power grid harmonic waves can be measured and analyzed, and the targeted ground grid loss treatment measures can be taken. And the influence of harmonic factors on the power grid can be effectively evaluated through the grid loss evaluation system.
Drawings
Fig. 1 is a schematic diagram of the electricity metering system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1 to illustrate the present embodiment, the electric quantity metering system in the present embodiment includes a current collection module 1, a voltage collection module 2, a signal conditioning module 3, a digital-to-analog conversion module 4, a microprocessor 5, a storage module 6, a display control module 7, and a communication module 8;
the current acquisition module 1 acquires three-phase current signals on the power transmission line in real time and uploads the acquired three-phase current signals to the signal conditioning module 3;
the voltage acquisition module 2 acquires three-phase voltage signals on the power transmission line in real time and uploads the acquired three-phase voltage signals to the signal conditioning module 3;
the signal conditioning module 3 is used for preprocessing the received three-phase current signals and three-phase voltage signals and sending the preprocessed three-phase current signals and three-phase voltage signals to the digital-to-analog conversion module 4;
the digital-to-analog conversion module 4 is used for performing digital-to-analog conversion on the received preprocessed three-phase current signals and three-phase voltage signals and sending the converted three-phase current signals and three-phase voltage signals to the microprocessor 5;
the microprocessor 5 is used for processing the three-phase current signals and the three-phase voltage signals which are received in real time and subjected to digital-to-analog conversion to obtain fundamental wave power and each subharmonic power at each moment, summing the fundamental wave power and the fundamental wave power of the three-phase voltage signals at each moment, taking the summation result as the total power transmission power at the moment, and obtaining the electric transmission quantity within the preset time according to the total power transmission power at each moment;
the microprocessor 5 is further used for storing the fundamental wave power, the subharmonic power and the transmission electric quantity within the preset time at each moment into the storage module 6; the power control module is also used for displaying the fundamental power and the subharmonic power at each moment through the display control module 7;
the microprocessor 5 is also used for calling data information from the storage module 6;
the display control module 7 is also used for displaying the information input from the outside;
the communication module 8 is further configured to upload the fundamental wave power, the sub-harmonic power, and the transmission power within the preset time, which are obtained by the microprocessor 5 at each time, to the remote terminal 10.
The electric quantity metering system provided by the embodiment measures and calculates the fundamental wave electric quantity and the harmonic wave electric quantity caused by injecting the harmonic component generated by the load into the power grid respectively, and can quickly and accurately meter the real electric quantity under the influence of the harmonic wave. During specific application, the electric quantity metering system can be installed at the inlet wire of the industrial and mining enterprise load to carry out bidirectional metering, main nodes and factors influencing power grid harmonic waves can be measured and analyzed, and the targeted ground grid loss treatment measures can be taken.
In this embodiment, the signal conditioning module 3 is configured to perform preprocessing on the received three-phase current signal and three-phase voltage signal by using the prior art, and mainly performs operations such as filtering of the signals.
Further, the metering system also comprises a power supply module 9;
and the power supply module 9 is used for supplying power to the current acquisition module 1, the voltage acquisition module 2, the signal conditioning module 3, the digital-to-analog conversion module 4, the microprocessor 5, the storage module 6, the display control module 7 and the communication module 8.
The network loss evaluation system realized by adopting the electric quantity metering system comprises two sets of electric quantity metering systems and a remote terminal 10;
the two sets of electric quantity metering systems are respectively arranged at two ends of the power transmission line;
and the remote terminal 10 is used for obtaining the line loss of the power transmission line according to the difference value of the transmission electric quantity output by the two sets of electric quantity metering systems within the preset time, so that the power grid loss is metered.
In the embodiment, data are collected to a remote terminal, and evaluation and analysis of network loss caused by waveform distortion and harmonic electric quantity can be performed on a line of a distribution network.
Furthermore, the network loss evaluation system implemented by using the electricity metering system, the remote terminal 10, calculates the average value of each harmonic power of each electricity metering system in a preset time period, and compares the average value of each harmonic power of each electricity metering system in the preset time period with a preset harmonic power threshold value, thereby implementing the level evaluation of the influence of the harmonic content on the power grid loss.
In the preferred embodiment, the content of each harmonic component generated by the load and the numerical value and the variation trend of the harmonic electric quantity injected into the power grid are analyzed, the harmonic content and the harmonic electric quantity lasting for a certain period of time are used as judgment bases, the harmonic content in the certain period of time can be obtained from each subharmonic power in a timing period, the harmonic content lasting for the certain period of time can be compared with a preset harmonic power threshold, and the level of the harmonic of the load and the influence on the power grid loss are subjected to grade evaluation.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (4)
1. The electric quantity metering system is characterized by comprising a current acquisition module (1), a voltage acquisition module (2), a signal conditioning module (3), a digital-to-analog conversion module (4), a microprocessor (5), a storage module (6), a display control module (7) and a communication module (8);
the current acquisition module (1) acquires three-phase current signals on the power transmission line in real time and uploads the acquired three-phase current signals to the signal conditioning module (3);
the voltage acquisition module (2) acquires three-phase voltage signals on the power transmission line in real time and uploads the acquired three-phase voltage signals to the signal conditioning module (3);
the signal conditioning module (3) is used for preprocessing the received three-phase current signals and three-phase voltage signals and sending the preprocessed three-phase current signals and three-phase voltage signals to the digital-to-analog conversion module (4);
the digital-to-analog conversion module (4) is used for performing digital-to-analog conversion on the received preprocessed three-phase current signals and three-phase voltage signals and sending the converted three-phase current signals and three-phase voltage signals to the microprocessor (5);
the microprocessor (5) is used for processing the three-phase current signals and the three-phase voltage signals which are received in real time and subjected to digital-to-analog conversion to obtain fundamental wave power and each subharmonic power at each moment, summing the fundamental wave power and the fundamental wave power of the three-phase voltage signals at each moment, taking the summation result as the total power transmission power at the moment, and obtaining the power transmission electric quantity within the preset time according to the total power transmission power at each moment;
the microprocessor (5) is also used for storing the fundamental wave power, the subharmonic power and the transmission electric quantity in the preset time at each moment into the storage module (6); the device is also used for displaying the fundamental wave power and the subharmonic power at each moment through a display control module (7);
the microprocessor (5) is also used for calling data information from the storage module (6);
the display control module (7) is also used for displaying the information input from the outside;
and the communication module (8) is also used for uploading the fundamental wave power, the subharmonic power and the transmission electric quantity within the preset time at each moment obtained by the microprocessor (5) to a remote terminal (10).
2. The electricity metering system of claim 1, characterized in that the metering system further comprises a power supply module (9);
the power supply module (9) is used for supplying power to the current acquisition module (1), the voltage acquisition module (2), the signal conditioning module (3), the digital-to-analog conversion module (4), the microprocessor (5), the storage module (6), the display control module (7) and the communication module (8).
3. Network loss assessment system implemented using a coulometry system according to claim 1, characterized in that it comprises two sets of coulometry systems and a remote terminal (10);
the two sets of electric quantity metering systems are respectively arranged at two ends of the power transmission line;
and the remote terminal (10) is used for obtaining the line loss of the power transmission line according to the difference value of the power transmission electric quantity output by the two sets of electric quantity metering systems within the preset time, so that the power grid loss is metered.
4. The grid loss evaluation system implemented by using electricity metering systems according to claim 3, wherein the remote terminal (10) further counts the average value of the harmonic power of each electricity metering system in a preset time period, and compares the average value of the harmonic power of each electricity metering system in the preset time period with a preset harmonic power threshold value, so as to realize the level evaluation of the influence of the harmonic content on the grid loss.
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Citations (7)
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| CN202486308U (en) * | 2012-03-19 | 2012-10-10 | 上海电力通信有限公司 | Harmonic electric quantity measuring system |
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| CN106908698A (en) * | 2017-04-28 | 2017-06-30 | 刘颖 | A kind of line loss detects automatic acquisition device and its method |
| CN108649697A (en) * | 2018-05-24 | 2018-10-12 | 安徽国电京润电力科技有限公司 | A kind of grid line loss detection automated collection systems |
| CN209148771U (en) * | 2018-08-31 | 2019-07-23 | 国网江苏省电力有限公司徐州供电分公司 | A kind of Measurement of Harmonics in Power System device based on synchronized sampling complete cycle |
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- 2020-12-28 CN CN202011589144.7A patent/CN112730975A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202486308U (en) * | 2012-03-19 | 2012-10-10 | 上海电力通信有限公司 | Harmonic electric quantity measuring system |
| CN203561692U (en) * | 2013-11-12 | 2014-04-23 | 国家电网公司 | Electric energy meter possessing automatic measuring range switching and capable of metering fundamental wave and harmonic wave respectively |
| CN106546944A (en) * | 2015-09-18 | 2017-03-29 | 侯飞 | It is a kind of in the method for having line loss system lieutenant colonel to test electric power meter error |
| CN106093558A (en) * | 2016-05-31 | 2016-11-09 | 武汉大学 | Electric energy acquisition terminal ERTU scheme for the metering of flexible direct current power transmission system efficiency |
| CN106908698A (en) * | 2017-04-28 | 2017-06-30 | 刘颖 | A kind of line loss detects automatic acquisition device and its method |
| CN108649697A (en) * | 2018-05-24 | 2018-10-12 | 安徽国电京润电力科技有限公司 | A kind of grid line loss detection automated collection systems |
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