CN106788591A - Photovoltaic parallel in system based on power line carrier communication - Google Patents
Photovoltaic parallel in system based on power line carrier communication Download PDFInfo
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- CN106788591A CN106788591A CN201611020709.3A CN201611020709A CN106788591A CN 106788591 A CN106788591 A CN 106788591A CN 201611020709 A CN201611020709 A CN 201611020709A CN 106788591 A CN106788591 A CN 106788591A
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- photovoltaic
- power line
- carrier communication
- line carrier
- communication module
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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Abstract
This application discloses a kind of photovoltaic parallel in system based on power line carrier communication, specially：In the direct current side apparatus and photovoltaic DC-to-AC converter of the photovoltaic parallel in system these equipment, each needs the equipment for carrying out power line carrier communication to be equipped with a Power Line Carrier Communication Module；And, the binding post ground connection of each Power Line Carrier Communication Module, another binding post connects the negative or positive electrode of the equipment corresponding with this Power Line Carrier Communication Module.The application improves the reliability of the power line carrier communication of photovoltaic parallel in system DC side.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more specifically to the photovoltaic based on power line carrier communication simultaneously
Net system.
Background technology
Power line carrier communication (hereinafter referred to as PLC) is the distinctive communication mode of power system.So-called PLC, refers to electricity
The line of force as high-frequency carrier signal transmission medium the communication technology, be that need not again set up network the characteristics of its is maximum, as long as
There is power line, just can data transfer.
PLC technology photovoltaic parallel in system DC side application as shown in figure 1, concrete analysis it is as follows：Photovoltaic parallel in system,
Be exactly the direct current that produces of photovoltaic module 100 by photovoltaic DC-to-AC converter 200 be converted into meeting utility grid requirement alternating current it
Access public electric wire net again afterwards.In large power photovoltaic grid-connection system, often also need to configuring direct current header box 300 etc. and conflux set
It is standby.It is so-called that PLC technology is applied to photovoltaic parallel in system DC side, refer to direct current side apparatus (such as light for photovoltaic parallel in system
Volt component 100, direct current conflux case 300 etc.) and photovoltaic DC-to-AC converter 200 these equipment in each need to carry out power line carrier
The equipment of communication all configures a PLC module, and each PLC module connects set corresponding with this PLC module respectively with two binding posts
The high-frequency carrier signal for needing to send can be just coupled to standby positive and negative electrode, such PLC module the power line of positive level and negative level
On be transmitted.
But because bridging has very big filter capacitor C, high frequency carrier letter between the DC side positive and negative electrode of photovoltaic DC-to-AC converter 200
Number will greatly be absorbed, caused PLC module (such as photovoltaic DC-to-AC converter 200 and direct current conflux case 300 near filter capacitor C
Interior PLC module) cannot carry out reliable communication with other PLC modules at all.
The content of the invention
In view of this, it is grid-connected to improve the invention provides the photovoltaic parallel in system based on power line carrier communication
The reliability of the power line carrier communication of system dc side.
A kind of photovoltaic parallel in system based on power line carrier communication, wherein：
In the direct current side apparatus and photovoltaic DC-to-AC converter of the photovoltaic parallel in system these equipment, each needs is carried out
The equipment of power line carrier communication is equipped with a Power Line Carrier Communication Module；
And, the binding post ground connection of each Power Line Carrier Communication Module, another binding post connects and this electricity
The negative or positive electrode of the corresponding equipment of powerline carrier communication module.
Wherein, the binding post ground connection of each Power Line Carrier Communication Module, including：
One binding post of each Power Line Carrier Communication Module passes through the corresponding institute of this Power Line Carrier Communication Module
Metal edge frame, metal shell or the metallic support for stating equipment are directly connected with the earth.
Wherein, the binding post ground connection of each Power Line Carrier Communication Module, including：
One binding post of each Power Line Carrier Communication Module is connected by copper bar with the earth.
Wherein, the photovoltaic DC-to-AC converter passes through itself corresponding Power Line Carrier Communication Module, the corresponding electricity of other equipment
Powerline carrier communication module to be communicated with other equipment foundation, and the running status to the other equipment is monitored.
Wherein, the running status to the other equipment is monitored, including：
Oneself state information is uploaded to the photovoltaic DC-to-AC converter by each photovoltaic module, and the photovoltaic DC-to-AC converter is finding there is light
When volt assembly operating is abnormal, the photovoltaic module of operation exception is turned off.
Wherein, the direct current side apparatus of the photovoltaic parallel in system include multiple photovoltaic modulies.
Wherein, the direct current side apparatus of the photovoltaic parallel in system include direct current conflux case and multiple photovoltaic modulies.
It can be seen from above-mentioned technical scheme that, high-frequency carrier signal is coupled to positive level by the PLC module in the present invention
It is transmitted on power line (or power line of negative level) and ground wire, without bridging filter capacitor C between this two transmission lines, thus
Also just do not exist influences asking for power line carrier communication transmission quality because high-frequency carrier signal is absorbed significantly by filter capacitor C
Topic.And, the coupled modes that the present invention is provided can also utilize the logical high frequencies of filter capacitor C to hinder the characteristic of low frequency, filter it is described just
Low-frequency component, reserved high-frequency composition on the power line (or power line of negative level) of level, so as to further improve power line carrier
Communication transmission quality.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of photovoltaic parallel in system structural representation based on power line carrier communication disclosed in prior art；
Fig. 2 is a kind of photovoltaic parallel in system structural representation based on power line carrier communication disclosed in the embodiment of the present invention
Figure；
Fig. 3 only has system structure diagram during 3 photovoltaic modulies for photovoltaic parallel in system shown in Fig. 2.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Referring to Fig. 2, the embodiment of the invention discloses a kind of photovoltaic parallel in system based on power line carrier communication, to improve
The reliability of the power line carrier communication of photovoltaic parallel in system DC side, specifically：
In the direct current side apparatus and photovoltaic DC-to-AC converter 200 these equipment of the photovoltaic parallel in system, each needs
The equipment for carrying out power line carrier communication is equipped with a PLC module；
And, the binding post ground connection of each PLC module, another binding post connects corresponding with this PLC module
The equipment negative or positive electrode (for ease of description, the present embodiment by two binding posts of PLC module, the wiring of ground connection
Terminal is defined as " the first binding post ", and another binding post is defined as " the second binding post ").
Wherein, the second binding post of each PLC module connects the negative or positive electrode of equipment corresponding with this PLC module, is
Refer to：Second binding post of each PLC module connects the positive pole of equipment corresponding with this PLC module；Or, each PLC module
The second binding post connect the negative pole of equipment corresponding with this PLC module；Or, the second terminals of a part of PLC module
Son connects the positive pole of equipment corresponding with this PLC module, and the second binding post of remaining PLC module connects corresponding with this PLC module
The negative pole of equipment.The positive pole that Fig. 2 only connects equipment corresponding with this PLC module with the second binding post of each PLC module is made
It is example.
Wherein, in powerful photovoltaic parallel in system, the direct current side apparatus of photovoltaic parallel in system include direct current conflux case
With multiple photovoltaic modulies；And in, in small-power photovoltaic parallel in system, the direct current side apparatus of photovoltaic parallel in system include multiple light
Volt component, but generally it is not provided with direct current conflux case.Fig. 2 only with large power photovoltaic grid-connection system as an example.
Wherein, the first binding post ground connection of each PLC module, can be that the first binding post of each PLC module leads to
Cross metal edge frame, metal shell or the metallic support of the corresponding equipment of this PLC module be directly connected with the earth, or
First binding post of each PLC module by copper bar with greatly be connected, or each PLC module the first binding post
Directly it is connected, or other earthing modes with the earth, does not limit to.
Made comparisons with prior art by by the present embodiment, it is known that：
Prior art is that high-frequency carrier signal is coupled on the power line of positive level and negative level to be transmitted, but this coupling
Under mode, because bridging has a very big filter capacitor C between the DC side positive and negative electrode of photovoltaic DC-to-AC converter 200, i.e., two transmission lines it
Span is connected to very big filter capacitor C, and filter capacitor C can significantly absorb high-frequency carrier signal, and influence power line carrier communication is passed
Transmission quality.
And the present embodiment is that high-frequency carrier signal is coupled on the power line of positive level (or power line of negative level) and ground wire
It is transmitted, without bridging filter capacitor C between two transmission lines, thus does not also just exist because high-frequency carrier signal is by filtered electrical
Hold C to absorb significantly and influence the problem of power line carrier communication transmission quality.
There is logical high frequency to hinder the characteristic of low frequency to be additionally, since filter capacitor C, so the coupled modes provided in the present embodiment
Under, filter capacitor C from the power line of the positive level (or power line of negative level) for transmitting the high-frequency carrier signal for coming
Be the equal of path, illustrate：Assuming that the quantity of photovoltaic module 100 is 3 in Fig. 2, it is respectively to be sequentially connected in series to be converged in direct current
Photovoltaic module #1, photovoltaic module #2, the photovoltaic module #3 between the positive and negative electrode of case 300 are flowed, as shown in Figure 3；As photovoltaic module #2
When corresponding PLC module (abbreviation A) launches high-frequency carrier signal to the corresponding PLC module (abbreviation B) of direct current conflux case 300, from A
The high-frequency carrier signal point both direction that sends of the second binding post be transferred to second binding post of B, direction be according to
Secondary positive pole, the negative pole of photovoltaic module #1, the positive pole of photovoltaic module #1, the positive pole of direct current conflux case 300 by photovoltaic module #2,
It is transferred to second binding post of B；Other direction is positive pole, the negative pole of photovoltaic module #2, the light for sequentially passing through photovoltaic module #2
The positive pole of volt component #3, the negative pole of photovoltaic module #3, the negative pole of direct current conflux case 300, filter capacitor C, direct current conflux case 300
Positive pole, is transferred to second binding post of B, and now filter capacitor C is the equal of path for high-frequency carrier signal.Institute
So that the coupled modes of the present embodiment can also utilize the logical high frequencies of filter capacitor C to hinder the characteristic of low frequency, filter the electric power of the positive level
Low-frequency component, reserved high-frequency composition on line (or power line of negative level), so as to further improve power line carrier communication transmission
Quality.
Alternatively, during power line carrier communication, photovoltaic DC-to-AC converter 200 by itself corresponding PLC module, other
The corresponding PLC module of equipment to be communicated with other equipment foundation, so as to the running status to the other equipment is supervised
Control.For example：The status information (such as voltage, electric current, temperature information) of itself is uploaded to photovoltaic DC-to-AC converter by each photovoltaic module 100
200, photovoltaic DC-to-AC converter 200 turns off the photovoltaic module of operation exception when finding to have photovoltaic module operation exception.
In sum, high-frequency carrier signal is coupled to the PLC module in the present invention power line (or the electricity of negative level of positive level
The line of force) and ground wire on be transmitted, between this two transmission lines without bridging filter capacitor C, thus also just do not exist because of high frequency
Carrier signal is absorbed and influences the problem of power line carrier communication transmission quality significantly by filter capacitor C.And, the present invention is provided
Coupled modes can also utilize the logical high frequencies of filter capacitor C to hinder the characteristic of low frequency, filter power line (or the negative level of the positive level
Power line) on low-frequency component, reserved high-frequency composition so that further improve power line carrier communication transmission quality.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can in other embodiments be realized in the case of the spirit or scope for not departing from the embodiment of the present invention.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The consistent scope most wide of features of novelty.
Claims (7)
1. a kind of photovoltaic parallel in system based on power line carrier communication, it is characterised in that：
In the direct current side apparatus and photovoltaic DC-to-AC converter of the photovoltaic parallel in system these equipment, each needs to carry out electric power
The equipment of line carrier communication is equipped with a Power Line Carrier Communication Module；
And, the binding post ground connection of each Power Line Carrier Communication Module, another binding post connects and this power line
The negative or positive electrode of the corresponding equipment of carrier communication module.
2. photovoltaic parallel in system according to claim 1, it is characterised in that each Power Line Carrier Communication Module
One binding post ground connection, including：
One binding post of each Power Line Carrier Communication Module described sets by the way that this Power Line Carrier Communication Module is corresponding
Standby metal edge frame, metal shell or metallic support are directly connected with the earth.
3. photovoltaic parallel in system according to claim 1, it is characterised in that each Power Line Carrier Communication Module
One binding post ground connection, including：
One binding post of each Power Line Carrier Communication Module is connected by copper bar with the earth.
4. photovoltaic parallel in system according to claim 1, it is characterised in that the photovoltaic DC-to-AC converter is corresponding by itself
The corresponding Power Line Carrier Communication Module of Power Line Carrier Communication Module, other equipment to be communicated with other equipment foundation,
Running status to the other equipment is monitored.
5. photovoltaic parallel in system according to claim 4, it is characterised in that the running status to the other equipment
It is monitored, including：
Oneself state information is uploaded to the photovoltaic DC-to-AC converter by each photovoltaic module, and the photovoltaic DC-to-AC converter is finding there is photovoltaic group
During part operation exception, the photovoltaic module of operation exception is turned off.
6. photovoltaic parallel in system according to claim 1, it is characterised in that the direct current side apparatus of the photovoltaic parallel in system
Including multiple photovoltaic modulies.
7. photovoltaic parallel in system according to claim 1, it is characterised in that the direct current side apparatus of the photovoltaic parallel in system
Including direct current conflux case and multiple photovoltaic modulies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611020709.3A CN106788591B (en) | 2016-11-21 | 2016-11-21 | Photovoltaic grid-connected system based on power line carrier communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611020709.3A CN106788591B (en) | 2016-11-21 | 2016-11-21 | Photovoltaic grid-connected system based on power line carrier communication |
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| Publication Number | Publication Date |
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| CN106788591A true CN106788591A (en) | 2017-05-31 |
| CN106788591B CN106788591B (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611020709.3A Active CN106788591B (en) | 2016-11-21 | 2016-11-21 | Photovoltaic grid-connected system based on power line carrier communication |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107483083A (en) * | 2017-09-14 | 2017-12-15 | 保定英利分布式能源股份有限公司 | Photovoltaic system monitoring method based on power line carrier communication |
| CN109802489A (en) * | 2019-01-25 | 2019-05-24 | 温州职业技术学院 | A kind of solar energy photovoltaic panel TTC & DT Systems based on power line carrier |
| CN110572184A (en) * | 2019-08-02 | 2019-12-13 | 华为技术有限公司 | Power generation system and communication device for power generation system |
| CN112165343A (en) * | 2020-09-25 | 2021-01-01 | 合肥阳光新能源科技有限公司 | High-frequency communication device, high-frequency carrier transmission direction control method, device and medium |
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| CN103986182A (en) * | 2014-01-21 | 2014-08-13 | 云南师范大学 | Photovoltaic grid connected system based on power line carrier communication |
| US20150028854A1 (en) * | 2012-09-18 | 2015-01-29 | Jining Power Supply Company Of State Grid Shandong Electric Power Company | Dispersed state monitoring device for distributed generation |
| CN104967214A (en) * | 2015-06-04 | 2015-10-07 | 南京理工大学 | Micro-grid system based on VACON industrial inverters |
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| US20150028854A1 (en) * | 2012-09-18 | 2015-01-29 | Jining Power Supply Company Of State Grid Shandong Electric Power Company | Dispersed state monitoring device for distributed generation |
| CN103986182A (en) * | 2014-01-21 | 2014-08-13 | 云南师范大学 | Photovoltaic grid connected system based on power line carrier communication |
| CN104967214A (en) * | 2015-06-04 | 2015-10-07 | 南京理工大学 | Micro-grid system based on VACON industrial inverters |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107483083A (en) * | 2017-09-14 | 2017-12-15 | 保定英利分布式能源股份有限公司 | Photovoltaic system monitoring method based on power line carrier communication |
| CN109802489A (en) * | 2019-01-25 | 2019-05-24 | 温州职业技术学院 | A kind of solar energy photovoltaic panel TTC & DT Systems based on power line carrier |
| CN110572184A (en) * | 2019-08-02 | 2019-12-13 | 华为技术有限公司 | Power generation system and communication device for power generation system |
| US11438026B2 (en) | 2019-08-02 | 2022-09-06 | Huawei Digital Power Technologies Co., Ltd. | Power generation system and communications apparatus used in power generation system |
| CN112165343A (en) * | 2020-09-25 | 2021-01-01 | 合肥阳光新能源科技有限公司 | High-frequency communication device, high-frequency carrier transmission direction control method, device and medium |
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| Publication number | Publication date |
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| CN106788591B (en) | 2020-05-22 |
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