CN103439546A - Electric energy measuring system and method for low-voltage user photovoltaic power generation - Google Patents
Electric energy measuring system and method for low-voltage user photovoltaic power generation Download PDFInfo
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- CN103439546A CN103439546A CN2013103183692A CN201310318369A CN103439546A CN 103439546 A CN103439546 A CN 103439546A CN 2013103183692 A CN2013103183692 A CN 2013103183692A CN 201310318369 A CN201310318369 A CN 201310318369A CN 103439546 A CN103439546 A CN 103439546A
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Abstract
The invention relates to an electric energy measuring system and method for low-voltage user photovoltaic power generation. The system comprises a photovoltaic array, a direct-current confluence device, a direct-current electric energy meter, an alternating-current electric energy meter, an electricity consumption information collecting device and a control computer. When electricity output by a grid-connected inverter is larger than that needed by user loads, the redundant electivity output by the grid-connected inverter is recorded as reverse electricity by the alternating-current electric energy meter; when electricity output by the grid-connected inverter is smaller than that needed by the user loads, insufficient loads of a user are extracted from a low-voltage power supply bus through the alternating-current electric energy meter and recorded as forward electricity by the alternating-current electric energy meter, direct-current electric energy data are compared with reverse alternating-current electric energy data, and an electricity consumption monitor can be timely reminded to monitor electricity stealing events suspected as photovoltaic power generation subsidy swindle when abnormal conditions occur.
Description
Technical field
The invention belongs to Electric Energy Metering Technology, specifically relate to a kind of low-voltage customer photovoltaic generation electric energy metered system and method thereof.
Background technology
Distributed photovoltaic power generation refers to the employing photovoltaic module, sun power directly is converted to the distributed generation system of electric energy.It is a kind of novel, tool generating with broad prospects for development and comprehensive utilization of energy mode, and it advocates generating nearby, grid-connected nearby, conversion nearby, the principle of using nearby.
Develop rapidly and the state net company of China's photovoltaic generation industry promotes a series of behaves of distributed photovoltaic power generation System Development, and to electric energy metrical, work has proposed lower requirement.Especially, under National Development and Reform Committee draws up the situation of the electrovalence policy of determining the encouragement photovoltaic generation, very likely occur that the photovoltaic generation user utilizes photovoltaic generation and electricity consumption price difference to try to gain the phenomenon of illegitimate benefits.At present, also do not have a set of corresponding system or method it is monitored, a series of relevant issues such as the stoichiometric point selection that the discussion photovoltaic power generation grid-connecting relates to, anti-electricity-theft mode.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of low-voltage customer photovoltaic generation electric energy metered system and method thereof.The present invention consists of direct current energy meter, AC energy meter, power information collecting device and acquisition system, control computing machine and daemon software; Direct current energy meter is responsible for measuring the size of the direct current energy of photovoltaic generation side, measured value by the collection of power information collecting device to controlling computing machine for comparing with AC generating data; Photovoltaic generating system is after inverter, AC is by being used the surfed the Net metering of AC energy of AC energy meter, measured value by the collection of power information collecting device to controlling computing machine and the DC side energy data compares, carried out the judgement of whether stealing by Background control software: if the stealing event does not occur, the AC electric energy is reported to main website; As the stealing event occurs, stealing affair alarm signal is sent to main website.
The objective of the invention is to adopt following technical proposals to realize:
A kind of low-voltage customer photovoltaic generation electric energy metered system, is characterized in that, described system comprises photovoltaic array, direct current collector-shoe gear, direct current energy meter, AC energy meter, power information collecting device and controls computing machine;
The direct current energy that described photovoltaic array sends is by direct current collector-shoe gear access direct current energy meter;
The voltage and current signal of described direct current energy meter is sent into combining inverter, and after inverter, between AC signal incoming transport electric energy meter and customer charge, the electric flux of electrical network and forward user power utilization is oppositely sent in the AC energy meter metering;
The direct current energy that direct current energy meter is measured carries out data acquisition with the alternating current energy of AC energy meter measurement by the power information collecting device, through the power information collecting device by communication to controlling computing machine or main website.
Preferably, described AC energy meter is the bidirectional measuring electric energy meter, the reverse electric weight of the unnecessary electric weight of the forward electric weight extracted from the 220V power supply buses by AC energy meter for record and combining inverter output.
Preferably, described control computing machine or main website comprise
Comparison module, compare for direct current energy data and Opposed crossing energy data;
Alarm module, while for the alternating current energy, being greater than the direct current energy, system will be sent warning.
Preferably, but described direct current energy meter measuring voltage scope is 0-700V, and range of current is 0.1A-500A.
The present invention is based on a kind of low-voltage customer photovoltaic generation electric energy gauging method that another purpose provides, described method comprises:
(1) photovoltaic array conversion of energy converging by the direct current collector-shoe gear;
(2) the direct current collector-shoe gear exports direct current energy meter to after adjusting electric current and voltage;
(3) direct current energy meter is sampled to calculate and will obtain direct current energy and is transferred to the power information harvester, and the power information collecting device is uploaded to received direct current energy information to control computing machine or acquisition system main website;
(4) direct current energy meter is converted into AC signal by combining inverter, incoming transport electric energy meter in parallel and customer charge;
(5) articulate user load on user's low-voltage bus bar, and be connected on the power supply low-voltage bus bar by voltage current transformer;
(6) that the combining inverter of reception is sent or the AC signal that the 220V power supply buses sends of AC energy meter is sampled and is calculated AC energy and transfer to the power information harvester, and the power information collecting device is uploaded to received AC energy information to control computing machine or acquisition system main website;
(7) the forward AC energy information collected is directly used in to the meterage foundation, direct current energy data and Opposed crossing energy data are compared.
Preferably, in described step (6), fixed proportion comprises:
AC energy meter can be carried out the bidirectional electric energy metering, and when the output of combining inverter is greater than needing of customer charge, the unnecessary electric weight of combining inverter output will be by the reverse electric weight of AC energy table record; With
When the output of combining inverter is less than needing of customer charge, the load of user's deficiency will extract by AC energy meter from the 220V power supply buses, and record the forward electric weight.
Further, described step (7) comprises that described direct current energy data and Opposed crossing energy data compare, while occurring that the alternating current energy is greater than the direct current energy, system will be sent warning, remind the supervision of power consumption personnel to carry out in time doubtful stealing event supervision of gaining the photovoltaic generation subsidy by cheating.
Compared with the prior art, beneficial effect of the present invention is:
Take full advantage of the built power information acquisition system of State Grid Corporation of China as data acquisition and channel, reduce the cost for the anti-theft electric energy metering method of low-voltage customer distributed photovoltaic power generation.
The present invention can complete the electric energy metrical for the low-voltage customer distributed photovoltaic power generation, and the measurement range of its electric current and voltage is determined by the measurement range of electric energy meter.
AC energy meter can be carried out the metering of bidirectional electric energy, thereby completing user is used the electrical network electric weight and carries the twocouese function of measuring of electric weight to electrical network.
Direct current energy data and Opposed crossing energy data are compared, when abnormal conditions occurring, remind in time the supervision of power consumption personnel to carry out in time doubtful stealing event supervision of gaining the photovoltaic generation subsidy by cheating.
The present invention utilizes the measurement result of direct current energy meter and the anti-electricity-theft ability of a whole set of measuring apparatus that relatively improved of AC measurment result, for the evidence obtaining of electricity filching behavior provides means.
The accompanying drawing explanation
Fig. 1 is for the invention provides a kind of low-voltage customer photovoltaic generation electric energy metered system principle assumption diagram.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
As described in Figure 1, a kind of low-voltage customer photovoltaic generation of the present invention electric energy metered system, specifically comprise photovoltaic array 1, direct current collector-shoe gear 2, direct current energy meter 3, combining inverter 4, AC energy meter 5, power information collecting device 7 and control computing machine 8.
The direct current energy that photovoltaic array 1 sends carries out the measurement of direct current energy by direct current collector-shoe gear 2 access direct current energy meters 3, send into combining inverter 4 through the voltage and current signal of direct current energy meter 3, direct current signal after inverter becomes interchange, AC signal incoming transport electric energy meter 5 in parallel and customer charge 6, the electric flux of electrical network and forward user power utilization is oppositely sent in AC energy meter 5 meterings, the alternating current energy that the direct current energy that direct current energy meter 3 is measured and AC energy meter 5 are measured carries out data acquisition by power information collecting device 7, through power information collecting device 7 by communication to controlling computing machine or main website 8.
Direct current energy meter can directly be measured the electric flux after the photovoltaic generation direct current confluxes.
AC energy meter, can carry out the bidirectional electric energy metering, can carry out external magnetic field interference monitoring and abnormity of power supply monitoring, and the warning under abnomal condition can be provided.
Can carry out by the power information collecting device collection and the transmission of the electric energy data that direct current energy meter and AC energy meter measure.
The background test system can be carried out data analysis, and judgement stealing event.
Embodiment
The present invention adopts following method, is specially:
1, photovoltaic array is electric energy by light energy conversion, and by collector-shoe gear, the DC current of a plurality of solar panels is converged.Collector-shoe gear will be adjusted the electric current and voltage that is applicable to inverter, and export this output signal to direct current energy meter.
2, direct current energy meter, by the calculating of sampling of the voltage and current signal of reception, obtains direct current energy, and this direct current energy is transferred to the power information harvester by 485 buses or carrier signal.
3, the power information collecting device utilizes optical fiber/transmission channels such as GPRS/ carrier wave to be uploaded to received direct current energy information and controls computing machine or acquisition system main website.
4, the voltage and current signal by direct current energy meter passes through combining inverter, direct current signal is converted to the AC signal that can directly use.This AC signal incoming transport electric energy meter in parallel and customer charge, AC signal is connected to the 220V power supply buses of electric system after by AC energy meter.
5, AC energy meter is the bidirectional measuring electric energy meter, and when the output of combining inverter is greater than needing of customer charge, the unnecessary electric weight of combining inverter output will be by the reverse electric weight of AC energy table record, and as DC power generation system the foundation to grid transmission; When the output of combining inverter is less than needing of customer charge, the load of user's deficiency will extract by AC energy meter from the 220V power supply buses, and record the forward electric weight, and carry out the foundation of the charge of electricity using to the user as electric system.
6, that the combining inverter of reception is sent or the alternating voltage current signal that the 220V power supply buses sends of the AC energy meter calculating of sampling, obtain AC energy, and this AC energy is transferred to the power information harvester by 485 buses or carrier signal.
7, the power information collecting device utilizes optical fiber/transmission channels such as GPRS/ carrier wave to be uploaded to received AC energy information and controls computing machine or acquisition system main website.
8, control computing machine, by software of the present invention, the forward AC energy information collected is directly used in to the meterage foundation, direct current energy data and Opposed crossing energy data are compared, while occurring that the alternating current energy is greater than the direct current energy, software will send warning, remind the supervision of power consumption personnel to carry out in time doubtful stealing event supervision of gaining the photovoltaic generation subsidy by cheating.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment, the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (7)
1. a low-voltage customer photovoltaic generation electric energy metered system, is characterized in that, described system comprises photovoltaic array, direct current collector-shoe gear, direct current energy meter, AC energy meter, power information collecting device and controls computing machine;
The direct current energy that described photovoltaic array sends is by direct current collector-shoe gear access direct current energy meter;
The voltage and current signal of described direct current energy meter is sent into combining inverter, and after inverter, between AC signal incoming transport electric energy meter and customer charge, the electric flux of electrical network and forward user power utilization is oppositely sent in the AC energy meter metering;
The direct current energy that direct current energy meter is measured carries out data acquisition with the alternating current energy of AC energy meter measurement by the power information collecting device, through the power information collecting device by communication to controlling computing machine or main website.
2. a kind of low-voltage customer photovoltaic generation electric energy metered system as claimed in claim 1, it is characterized in that, described AC energy meter is the bidirectional measuring electric energy meter, the reverse electric weight of the unnecessary electric weight of the forward electric weight extracted from the 220V power supply buses by AC energy meter for record and combining inverter output.
3. a kind of low-voltage customer photovoltaic generation electric energy metered system as claimed in claim 1, is characterized in that, described control computing machine or main website comprise
Comparison module, compare for direct current energy data and Opposed crossing energy data;
Alarm module, while for the alternating current energy, being greater than the direct current energy, system will be sent warning.
4. a kind of low-voltage customer photovoltaic generation electric energy metered system as claimed in claim 1, is characterized in that, but described direct current energy meter measuring voltage scope is 0-700V, and range of current is 0.1A-500A.
5. a low-voltage customer photovoltaic generation electric energy gauging method, is characterized in that, described method comprises:
(1) photovoltaic array conversion of energy converging by the direct current collector-shoe gear;
(2) the direct current collector-shoe gear exports direct current energy meter to after adjusting electric current and voltage;
(3) direct current energy meter is sampled to calculate and will obtain direct current energy and is transferred to the power information harvester, and the power information collecting device is uploaded to received direct current energy information to control computing machine or acquisition system main website;
(4) direct current energy meter is converted into AC signal by combining inverter, incoming transport electric energy meter in parallel and customer charge;
(5) articulate user load on user's low-voltage bus bar, and be connected on the power supply low-voltage bus bar by voltage current transformer;
(6) that the combining inverter of reception is sent or the AC signal that the 220V power supply buses sends of AC energy meter is sampled and is calculated AC energy and transfer to the power information harvester, and the power information collecting device is uploaded to received AC energy information to control computing machine or acquisition system main website;
(7) the forward AC energy information collected is directly used in to the meterage foundation, direct current energy data and Opposed crossing energy data are compared.
6. a kind of low-voltage customer photovoltaic generation electric energy gauging method as claimed in claim 5, is characterized in that, described step (6) comprising:
AC energy meter can be carried out the bidirectional electric energy metering, and when the output of combining inverter is greater than needing of customer charge, the unnecessary electric weight of combining inverter output will be by the reverse electric weight of AC energy table record; With
When the output of combining inverter is less than needing of customer charge, the load of user's deficiency will extract by AC energy meter from the 220V power supply buses, and record the forward electric weight.
7. a kind of low-voltage customer photovoltaic generation electric energy gauging method as claimed in claim 5, it is characterized in that, described step (7) comprises that described direct current energy data and Opposed crossing energy data compare, while occurring that the alternating current energy is greater than the direct current energy, system will be sent warning, remind the supervision of power consumption personnel to carry out in time doubtful stealing event supervision of gaining the photovoltaic generation subsidy by cheating.
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Cited By (7)
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| CN104361233A (en) * | 2014-11-11 | 2015-02-18 | 国家电网公司 | Anti-electric larceny management method under condition of access of distributed generation |
| CN104569527A (en) * | 2015-02-03 | 2015-04-29 | 国家电网公司 | Metering box used for low-voltage distributed type photovoltaic power generation |
| CN104730345A (en) * | 2013-12-18 | 2015-06-24 | 西安信唯信息科技有限公司 | Distributed electric quantity measuring system for photovoltaic power generation grid-connected inverter test device |
| CN107547047A (en) * | 2017-10-19 | 2018-01-05 | 广东电网有限责任公司江门供电局 | A kind of grid-connected monitoring system of distributed photovoltaic and monitoring method |
| US9983024B2 (en) | 2015-02-04 | 2018-05-29 | Solarcity Corporation | Determining a load meter installation location in an energy generation system |
| CN110376432A (en) * | 2019-07-17 | 2019-10-25 | 吴天凤 | Intelligentized electric energy control system |
| CN110661295A (en) * | 2019-10-15 | 2020-01-07 | 合肥阳光新能源科技有限公司 | Inverter and photovoltaic power generation system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104730345A (en) * | 2013-12-18 | 2015-06-24 | 西安信唯信息科技有限公司 | Distributed electric quantity measuring system for photovoltaic power generation grid-connected inverter test device |
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| CN110376432A (en) * | 2019-07-17 | 2019-10-25 | 吴天凤 | Intelligentized electric energy control system |
| CN110661295A (en) * | 2019-10-15 | 2020-01-07 | 合肥阳光新能源科技有限公司 | Inverter and photovoltaic power generation system |
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Application publication date: 20131211 |