CN204517420U - A kind of phase sequence recognition device and three-phase grid system - Google Patents
A kind of phase sequence recognition device and three-phase grid system Download PDFInfo
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- CN204517420U CN204517420U CN201520186089.5U CN201520186089U CN204517420U CN 204517420 U CN204517420 U CN 204517420U CN 201520186089 U CN201520186089 U CN 201520186089U CN 204517420 U CN204517420 U CN 204517420U
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Abstract
This application discloses a kind of phase sequence recognition device and three-phase grid system, wherein, this phase sequence recognition device comprises: be connected in parallel on the first switching device between the Article 1 live wire of three-phase grid system and zero line; Be connected in parallel on the second switch device between the Article 2 live wire of three-phase grid system and zero line; Be connected in parallel on the 3rd switching device between the Article 3 live wire of three-phase grid system and zero line; And by described first switching device, described second switch device and described 3rd switching device access three-phase grid system, and adopt power-line carrier communication to monitor the main control end of each grid-connection device in three-phase grid system, to identify the phase sequence in three-phase grid system belonging to each grid-connection device.
Description
Technical field
The utility model relates to technical field of generating electricity by way of merging two or more grid systems, and more particularly, relates to a kind of phase sequence recognition device and three-phase grid system.
Background technology
For the three-phase grid system be made up of multiple grid-connection device, if main control end can not identify the phase sequence belonging to each grid-connection device, the monitoring to each grid-connection device will be unfavorable for.
Three-phase grid system to be made up of multiple Miniature inverter: initial networking or again networking time allow main control end obtain phase sequence belonging to each Miniature inverter, so when a certain have the Miniature inverter fault of some mutually after, power stage falls in the Miniature inverter that can control in other phases, thus reaches the object of keeping system three-phase output balance before breakdown maintenance.
Visible, how identifying phase sequence belonging to each grid-connection device, thus realize better monitoring, is the problem that this area needs solution badly.
Utility model content
In view of this, the utility model provides a kind of phase sequence recognition device and three-phase grid system, to identify the phase sequence in three-phase grid system belonging to each grid-connection device.
A kind of phase sequence recognition device, comprising:
Be connected in parallel on the first switching device between the Article 1 live wire of three-phase grid system and zero line;
Be connected in parallel on the second switch device between the Article 2 live wire of three-phase grid system and zero line;
Be connected in parallel on the 3rd switching device between the Article 3 live wire of three-phase grid system and zero line;
And by described first switching device, described second switch device and described 3rd switching device access three-phase grid system, and power-line carrier communication is adopted to monitor the main control end of each grid-connection device in three-phase grid system.
Wherein, described main control end comprises resonant network, modulation /demodulation module and transformer, wherein:
Described transformer side winding is connected to described modulation /demodulation module through described resonant network, one end of its opposite side winding is connected to different live wire through described first switching device, described second switch device and described 3rd switching device respectively, and the other end of described opposite side winding is connected to zero line.
Wherein, described first switching device, described second switch device and described 3rd switching device are gate-controlled switch.
Wherein, described gate-controlled switch is MOS, thyristor, relay or circuit breaker.
Wherein, described first switching device, described second switch device and described 3rd switching device are hand switch.
A kind of three-phase grid system, comprise: multiple grid-connection device, above-mentioned any one phase sequence recognition device disclosed, first coupling network of connecting with the first switching device in described phase sequence recognition device, and described phase sequence recognition device in the second coupling network of second switch devices in series, and the 3rd coupling network of connecting with the 3rd switching device in described phase sequence recognition device.
Wherein, described grid-connection device is Miniature inverter.
As can be seen from above-mentioned technical scheme, the utility model is by the difference switching device in parallel between each live wire with zero line in three-phase grid system, initial networking or again networking time, the only closed switching device be connected in specific phase sequence, so main control end is exactly the grid-connection device belonging to this specific phase sequence by the grid-connection device that power-line carrier communication recognizes, thus achieves the identification to phase sequence belonging to each grid-connection device in three-phase grid system.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of phase sequence recognition device structural representation being applied in three-phase grid system disclosed in the utility model embodiment;
Fig. 2 is a kind of three-phase grid system configuration schematic diagram disclosed in the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
See Fig. 1, the utility model embodiment discloses a kind of phase sequence recognition device, to identify the phase sequence in three-phase grid system belonging to each grid-connection device, comprising:
Be connected in parallel on the first switching device S1 between the Article 1 live wire L1 of three-phase grid system and zero line N;
Be connected in parallel on the second switch device S2 between the Article 2 live wire L2 of three-phase grid system and zero line N;
Be connected in parallel on the 3rd switching device S3 between the Article 3 live wire L3 of three-phase grid system and zero line N;
And access three-phase grid system by the first switching device S1, second switch device S2 and the 3rd switching device S3, and adopt PLC (power line carrier communication, power line carrier communication) technology to monitor the main control end 10 of each grid-connection device in three-phase grid system.
As shown in Figure 1, grid-connection device in three-phase grid system comprises: be connected in parallel on the grid-connection device A1 ~ An between L1 and N, be connected in parallel on the grid-connection device B1 ~ Bn between L2 and N, and the grid-connection device C1 ~ Cn be connected in parallel between L3 and N, that is, phase sequence belonging to grid-connection device A1 ~ An, B1 ~ Bn, C1 ~ Cn is respectively L1 phase, L2 phase, L3 phase.
Want to monitor each grid-connection device, with regard to the phase sequence belonging to each watch-dog of GPRS.The present embodiment initial networking or again networking time, the only closed switching device be connected in specific phase sequence, the grid-connection device that so at this moment main control end 10 recognizes is exactly the grid-connection device belonging to this specific phase sequence.Specifically describe as follows:
1) closed first switching device S1, simultaneously disconnection second switch device S2 and the 3rd switching device S3, the phase sequence belonging to grid-connection device that now main control end 10 recognizes is exactly L1 phase;
Only during closed first switching device S1, main control end 10 can only recognize grid-connection device A1 ~ An, and phase sequence belonging to known grid-connection device A1 ~ An is really L1 phase, and therefore the phase sequence recognition result of main control end 10 couples of grid-connection device A1 ~ An is errorless;
2) closed second switch device S2, disconnect the first switching device S1 and the 3rd switching device S3 simultaneously, the phase sequence belonging to grid-connection device that now main control end 10 recognizes is exactly L2 phase;
During closed second switch device S2, main control end 10 can only recognize grid-connection device B1 ~ Bn, and phase sequence belonging to known grid-connection device B1 ~ Bn is really L2 phase, and therefore the phase sequence recognition result of main control end 10 couples of grid-connection device B1 ~ Bn is errorless;
3) close the 3rd switching device S3, disconnect the first switching device S1 and second switch device S2 simultaneously, the phase sequence belonging to grid-connection device that now main control end 10 recognizes is exactly L3 phase;
Only during closed 3rd switching device S3, main control end 10 can only recognize grid-connection device C1 ~ Cn, and phase sequence belonging to known grid-connection device C1 ~ Cn is really L3 phase, and therefore the phase sequence recognition result of main control end 10 couples of grid-connection device C1 ~ Cn is errorless.
Above-mentioned phase sequence recognition result is true to life, and recognition logic simple possible, be easy to be extended and applied.
Wherein, main control end 10 adopts PLC technology to realize to the identification of different grid-connection device, described PLC is the communication of power system of the transmission medium taking transmission line as carrier signal, main control end 10 adopts PLC complete uploading of information from different grid-connection device and assign, thus realizes the identification to each grid-connection device.
Concrete, still see Fig. 1, main control end 10 comprises resonant network 101, modulation /demodulation module 102 and transformer T1, wherein:
Transformer T1 side winding is connected to modulation /demodulation module 102 through resonant network 101, one end of its opposite side winding is connected to different live wire through the first switching device S1, second switch device S2 and the 3rd switching device S3 respectively, and the other end of described opposite side winding is connected to zero line N.
Main control end 10 carries out plc communication by resonant network 101, modulation /demodulation module 102 and transformer T1 and grid-connection device, thus realizes the identification to different grid-connection device.Concrete, analog signal for digital signal being converted to analog signal at transmitting terminal by modulation, and is converted to digital signal at receiving terminal by demodulation by modulation /demodulation module 102 again; Resonant network 101 is for amplifying the analog signal after modulation; Transformer T1 is used for carrying out the conversion of high-low pressure isolation signals between the main circuit and resonant network 101 of three-phase grid system.
Wherein, first switching device S1, second switch device S2 and the 3rd switching device S3 can unify to adopt gate-controlled switch, as MOS (Metal Oxide Semiconductor FET, mos field effect transistor), thyristor, relay or circuit breaker etc., or, also can unify to adopt hand switch.
In addition, see Fig. 2, the utility model embodiment also discloses a kind of three-phase grid system, to identify the phase sequence in three-phase grid system belonging to each grid-connection device, comprise multiple grid-connection device (as grid-connection device A1 ~ An, grid-connection device B1 ~ Bn, grid-connection device C1 ~ Cn), above-mentioned any one phase sequence recognition device disclosed, first coupling network 103 of connecting with the first switching device S1 in described phase sequence recognition device, second coupling network 104 of connecting with the second switch device S2 in described phase sequence recognition device, and the 3rd coupling network 105 of to connect with the 3rd switching device S3 in described phase sequence recognition device.
Before three-phase grid system worked well, described phase sequence recognition device is relied on to complete identification to phase sequence belonging to each grid-connection device.
In the three-phase grid system worked well stage, first switching device S1, second switch device S2 and the 3rd switching device S3 are all in closure state, first coupling network 101/ second coupling network 102/ the 3rd coupling network 103 for the power line carrier signal that this phase power line transmits being coupled to the power line of other phases, thus completes the communication with grid-connection device on not homophase.Analog signal for digital signal being converted to analog signal at transmitting terminal by modulation, and is converted to digital signal at receiving terminal by demodulation by modulation /demodulation module 102 in the main control end 10 of described phase sequence recognition device again; Resonant network 101 is for amplifying the analog signal after modulation; Transformer T1 is used for carrying out the conversion of high-low pressure isolation signals between the main circuit and resonant network 101 of three-phase grid system, thus realizes the object that main control end 10 adopts each grid-connection device in PLC technology monitoring three-phase grid system.
Wherein, described grid-connection device includes but not limited to Miniature inverter.
In sum, the utility model is by the difference switching device in parallel between each live wire with zero line in three-phase grid system, initial networking or again networking time, the only closed switching device be connected in specific phase sequence, so main control end is exactly the grid-connection device belonging to this specific phase sequence by the grid-connection device that power-line carrier communication recognizes, thus achieves the identification to phase sequence belonging to each grid-connection device in three-phase grid system.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (7)
1. a phase sequence recognition device, is characterized in that, comprising:
Be connected in parallel on the first switching device between the Article 1 live wire of three-phase grid system and zero line;
Be connected in parallel on the second switch device between the Article 2 live wire of three-phase grid system and zero line;
Be connected in parallel on the 3rd switching device between the Article 3 live wire of three-phase grid system and zero line;
And by described first switching device, described second switch device and described 3rd switching device access three-phase grid system, and power-line carrier communication is adopted to monitor the main control end of each grid-connection device in three-phase grid system.
2. phase sequence recognition device according to claim 1, is characterized in that, described main control end comprises resonant network, modulation /demodulation module and transformer, wherein:
Described transformer side winding is connected to described modulation /demodulation module through described resonant network, one end of its opposite side winding is connected to different live wire through described first switching device, described second switch device and described 3rd switching device respectively, and the other end of described opposite side winding is connected to zero line.
3. phase sequence recognition device according to claim 1 and 2, is characterized in that, described first switching device, described second switch device and described 3rd switching device are gate-controlled switch.
4. phase sequence recognition device according to claim 3, is characterized in that, described gate-controlled switch is MOS, thyristor, relay or circuit breaker.
5. phase sequence recognition device according to claim 1 and 2, is characterized in that, described first switching device, described second switch device and described 3rd switching device are hand switch.
6. a three-phase grid system, it is characterized in that, comprise: the phase sequence recognition device according to any one of multiple grid-connection device, claim 1-5, first coupling network of connecting with the first switching device in described phase sequence recognition device, with the second coupling network of second switch devices in series in described phase sequence recognition device, and the 3rd coupling network of connecting with the 3rd switching device in described phase sequence recognition device.
7. three-phase grid system according to claim 6, is characterized in that, described grid-connection device is Miniature inverter.
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| CN201520186089.5U CN204517420U (en) | 2015-03-30 | 2015-03-30 | A kind of phase sequence recognition device and three-phase grid system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008338A (en) * | 2017-11-13 | 2018-05-08 | 国网江西省电力有限公司电力科学研究院 | A kind of non-effective access automatic identifying method of the electric energy meter neutral conductor |
| CN112737639A (en) * | 2020-12-24 | 2021-04-30 | 阳光电源股份有限公司 | Phase sequence identification method for power line carrier communication and photovoltaic system |
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2015
- 2015-03-30 CN CN201520186089.5U patent/CN204517420U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008338A (en) * | 2017-11-13 | 2018-05-08 | 国网江西省电力有限公司电力科学研究院 | A kind of non-effective access automatic identifying method of the electric energy meter neutral conductor |
| CN108008338B (en) * | 2017-11-13 | 2020-04-14 | 国网江西省电力有限公司电力科学研究院 | Automatic identification method for ineffective access of neutral line of electric energy meter |
| CN112737639A (en) * | 2020-12-24 | 2021-04-30 | 阳光电源股份有限公司 | Phase sequence identification method for power line carrier communication and photovoltaic system |
| CN112737639B (en) * | 2020-12-24 | 2022-07-12 | 阳光电源股份有限公司 | Phase sequence identification method for power line carrier communication and photovoltaic system |
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