CN207782746U - A kind of photovoltaic DC-to-AC converter, photovoltaic inverting system and its PID protective devices - Google Patents
A kind of photovoltaic DC-to-AC converter, photovoltaic inverting system and its PID protective devices Download PDFInfo
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- CN207782746U CN207782746U CN201820300444.0U CN201820300444U CN207782746U CN 207782746 U CN207782746 U CN 207782746U CN 201820300444 U CN201820300444 U CN 201820300444U CN 207782746 U CN207782746 U CN 207782746U
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- 230000001681 protective effect Effects 0.000 title claims abstract description 16
- 238000005070 sampling Methods 0.000 claims abstract description 30
- 230000007935 neutral effect Effects 0.000 claims abstract description 17
- 239000011800 void material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 10
- 230000005611 electricity Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000002313 adhesive film Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The utility model provides a kind of PID protective devices of photovoltaic DC-to-AC converter, and photovoltaic DC-to-AC converter includes the DC bus being connect with photovoltaic array and the inversion unit that is connect with DC bus, including the dummy neutral unit that one end is connect with inversion unit output end；The adjustable DC source being connect respectively with the dummy neutral unit other end or DC bus cathode by controllably switching switch；Input terminal is connect with DC bus to acquire the first sampling unit of its electric current；The control unit that first input end is connect with the first sampling unit output end, the first output end is connected with controllable switching switch, the controllable switching switch motion of current data control that control unit is fed back according to the first sampling unit.The utility model also provides a kind of photovoltaic DC-to-AC converter and photovoltaic inverting system.The utility model inhibits PID effects when photovoltaic DC-to-AC converter works, and PID reparations are carried out when photovoltaic DC-to-AC converter is stopped, and photovoltaic DC-to-AC converter is made to have good PID protection effects.
Description
Technical field
The utility model is related to a kind of photovoltaic DC-to-AC converter, photovoltaic inverting system and its PID protective devices.
Background technology
PID effects are the encapsulating material of battery component and the material of its upper surface and the lower surface, since cell piece and its connect
There is Ion transfer in action of high voltage between ground metal edge frame, and the phenomenon that cause assembly property to decay.In temperature height, humidity
Application scenarios, the photovoltaic module such as big distributed roof, the water surface, coastal are easy to happen PID effects, can be to built photovoltaic power station power generation amount
It influences huge.Current existing photovoltaic system PID solutions are predominantly following several：
One, component manufacturer use high performance encapsulating material, such as improve EVA adhesive film insulation performance and barrier property or
Using the novel adhesive film material with good insulating performance, but production cost is higher and is not suitable for being completed the photovoltaic of production
Power station.
Two, during practical anti-PID, common is cathode grounding scheme, i.e., leads to the cathode of photovoltaic module or inverter
It crosses resistance or fuse is directly grounded, the voltage PE of component cathode over the ground is made to be maintained at equipotential with grounded metal frame, eliminate
Back bias voltage.Cathode ground connection there are the problem of mainly have：Cathode ground connection makes component anode above earth potential, and there are high pressure, operation maintenance personnels
Shock hazard can be occurred by accidentally touching；In addition earth fault occurs between component anode or cable, causes component anode and cathode to occur short
Road or arc fault bring fire hazard, and inverter can be since the excessive shutdown of leakage current be to influence generated energy.
Three, exchange side dummy neutral is lifted scheme, and it is electric over the ground to be lifted exchange side dummy neutral by external dc source
Position reaches and promotes busbar central point above earth potential, to be lifted component cathode above earth potential indirectly, for photovoltaic system, the party
Case only be applicable in inverter normally grid-connected work when inhibit PID effects.Component is can not achieve when night, inverter was stopped
PID is compensated and is repaired, and especially for string type inverter, when night is stopped, the relay of inverter internal is disconnected
It opens, exchange side dummy neutral is lifted the midpoint potential that can not change direct current inlet highway.
Four, PID recovery scenarios are that positive pressurization is carried out between cathode and ground to photovoltaic array, but in photovoltaic system on daytime
System cannot pressurize when normally generating electricity by way of merging two or more grid systems, because the current direction of photovoltaic module and the direction of adjustable current source are opposite
, PID recovery scenarios can only work when inverter is stopped.
Utility model content
The purpose of this utility model is in view of the deficiencies of the prior art, to propose a kind of photovoltaic DC-to-AC converter, photovoltaic inverting system
And its PID protective devices, inhibit PID effects when photovoltaic DC-to-AC converter works, PID is carried out when photovoltaic DC-to-AC converter is stopped and is repaiied
It is multiple, make photovoltaic DC-to-AC converter that there is good PID protection effects.
The utility model is achieved through the following technical solutions：
A kind of PID protective devices of photovoltaic DC-to-AC converter, photovoltaic DC-to-AC converter include the DC bus being connect with photovoltaic array and
The inversion unit being connect with DC bus, including dummy neutral unit that one end is connect with inversion unit output end；By can
The adjustable DC source that control switching switch is connect with the dummy neutral unit other end or DC bus cathode respectively；Input terminal with
DC bus is connected to acquire the first sampling unit of its electric current；First input end connect with the first sampling unit output end,
The control unit of one output end and controllable switching switch connection, the current data control that control unit is fed back according to the first sampling unit
The controllable switching switch motion of system.
Further, described further includes that input terminal is connect with DC bus cathode to acquire the second sampling of its above earth potential
Unit, the second sampling unit output end are connect with the second input terminal of described control unit, control unit second output terminal with it is described
Adjustable DC source connects, the output electricity in the potential data control adjustable DC source that control unit is fed back according to the second sampling unit
Pressure.
Further, further include anti-on the connecting line being arranged between the DC bus cathode and controllable switching switch
Anti- diode.
Further, further include input terminal connect with the inversion unit output end, output end respectively with adjustable DC source,
First, second sampling unit is connected with control unit to provide the AC/DC units of working power for it.
Further, the dummy neutral unit include resistance either one end of inductance capacitance or inductance with it is described
The connection of inversion unit output end, the other end are connect with the adjustable DC source.
Further, the photovoltaic DC-to-AC converter is string type inverter.
Further, the photovoltaic DC-to-AC converter further includes MPPT unit and relay unit, MPPT unit input terminal and institute
State the connection of photovoltaic array output end, output end and DC bus connect, relay unit one end connect with inversion unit output end,
The other end is connect with dummy neutral unit one end.
The utility model is also achieved through the following technical solutions：
A kind of photovoltaic DC-to-AC converter, including as above any PID protective devices.
The utility model is also achieved through the following technical solutions：
A kind of photovoltaic inverting system, it is characterised in that：Including more photovoltaic DC-to-AC converters as described above in parallel.
The utility model has the advantages that：
1, the control unit of the utility model judges photovoltaic inversion according to the DC bus current that the first sampling unit acquires
Whether device works, and when photovoltaic DC-to-AC converter works, controlling controllable switching switch motion makes adjustable DC source and dummy neutral list
First other end connection, adjustable DC source are lifted dummy neutral unit voltage to change photovoltaic array component cathode potential, thus
Inhibit component PID effects, power station generated energy loss is greatly lowered；When photovoltaic DC-to-AC converter is stopped, controllable switching is controlled
Switch motion makes adjustable DC source be connect with DC bus cathode, and adjustable DC source adds just to photovoltaic DC-to-AC converter DC bus cathode
Press makes the indices of each component restore normal to repair the component for having occurred and that PID, maximumlly reduces the mistake of array component
It is suitable for water surface photovoltaic power station, coastal area power station with loss to make photovoltaic DC-to-AC converter that there is good PID protection effects
Contour wet salt mist is also easy to produce the application scenario of PID phenomenons.
2, the utility model control unit acquires DC bus above earth potential according to the second sampling unit and determines whether to pair
Photovoltaic array component carries out the reparation of night PID, and when carrying out night PID reparations, according to the DC bus above earth potential of feedback
The output voltage for controlling adjustable DC source, to promote PID repairing effects.
Description of the drawings
The utility model is described in further details below in conjunction with the accompanying drawings.
Fig. 1 is the functional block diagram of the utility model photovoltaic DC-to-AC converter.
Specific implementation mode
Photovoltaic DC-to-AC converter includes the DC bus being connect with photovoltaic array and the inversion unit that is connect with DC bus,
As shown in Figure 1, photovoltaic inverting system includes more photovoltaic DC-to-AC converters in parallel, which is that string type is inverse
Become device, including multiple MPPT units 2, DC bus 3, inversion unit 4, relay unit 5 and PID protective devices 6, PID protection
Device includes dummy neutral unit 61, controllable switching switch K, adjustable DC source 62, counnter attack diode D, the first sampling unit
63, the second sampling unit 64, control unit 65 and AC/DC units 66.
2 input terminal of multiple MPPT units connect with 1 output end of multiple photovoltaic arrays respectively, output end with DC bus 3
One end connects；4 input terminal of inversion unit is connect with 3 other end of DC bus, output end and 5 one end of relay unit connect；It is empty
Quasi- neutrality 61 one end of dot element is connect with 5 other end of relay unit；Adjustable DC source 62 by controllably switch switch K respectively with
61 other end of dummy neutral unit or the connection of 3 cathode of DC bus；Counnter attack diode D anodes connect with 3 cathode of DC bus
Connect, cathode is connect with controllable switching switch K, to prevent 1 electric current of photovoltaic array from pouring in down a chimney to adjustable DC source 62；First sampling unit
63 input terminals are connect with 3 cathode of DC bus to acquire its electric current；Second sampling unit, 64 input terminal connects with 3 cathode of DC bus
It connects to acquire its above earth potential；65 first input end of control unit connect with 63 output end of the first sampling unit, the second input terminal
It is connect with 64 output end of the second sampling unit, the first output end is connect with controllable switching switch K to control its action, the second output
End is connect with adjustable DC source 62 to control its output voltage, the electric current control that control unit 65 is fed back according to the first sampling unit 63
The controllable switching switch K actions of system, and according to the output electricity in the control of Electric potentials adjustable DC source 62 of second of sampling unit 64 feedback
Pressure；66 input terminal of AC/DC units is connect with 5 other end of relay unit, output end is sampled with adjustable DC source 62, first respectively
Unit 63, the second sampling unit 64 and the connection of control unit 65 for it to provide working power.
Dummy neutral unit 61 includes three resistance R that one end is connect with 5 output end of relay unit respectively, three electricity
The resistance R other ends are connect with adjustable DC source 62.
First sampling unit 63 is current transformer, and the second sampling unit 64 is voltage transformer, and control unit 65 is single
Piece machine.
The above, the only preferred embodiment of the utility model, therefore the utility model implementation cannot be limited with this
Range all should still belong to this that is, according to equivalent changes and modifications made by present utility model application the scope of the claims and description
In the range of utility model patent is covered.
Claims (9)
1. a kind of PID protective devices of photovoltaic DC-to-AC converter, photovoltaic DC-to-AC converter include the DC bus being connect with photovoltaic array and with
The inversion unit of DC bus connection, it is characterised in that：The dummy neutral list being connect with inversion unit output end including one end
Member；The adjustable DC being connect respectively with the dummy neutral unit other end or DC bus cathode by controllably switching switch
Source；Input terminal is connect with DC bus to acquire the first sampling unit of its electric current；First input end and the first sampling unit are defeated
Outlet connection, the first output end switch the control unit of connection with controllable switching, and control unit is fed back according to the first sampling unit
The controllable switching switch motion of current data control.
2. a kind of PID protective devices of photovoltaic DC-to-AC converter according to claim 1, it is characterised in that：Described further includes defeated
Enter end to be connect with DC bus cathode to acquire the second sampling unit of its above earth potential, the second sampling unit output end with it is described
The second input terminal of control unit connects, and control unit second output terminal connect with the adjustable DC source, and control unit is according to the
The output voltage in the potential data control adjustable DC source of two sampling units feedback.
3. a kind of PID protective devices of photovoltaic DC-to-AC converter according to claim 1, it is characterised in that：Further include that setting exists
The counnter attack diode on connecting line between the DC bus cathode and controllable switching switch.
4. a kind of PID protective devices of photovoltaic DC-to-AC converter according to claim 2, it is characterised in that：It further include input terminal
It is connect with the inversion unit output end, output end connects with adjustable DC source, the first, second sampling unit and control unit respectively
It connects to provide the AC/DC units of working power for it.
5. a kind of PID protective devices of photovoltaic DC-to-AC converter according to claim 1 or 2 or 3, it is characterised in that：The void
Quasi- neutrality dot element includes that either one end of inductance capacitance or inductance connect with the inversion unit output end, is another resistance
End is connect with the adjustable DC source.
6. a kind of PID protective devices of photovoltaic DC-to-AC converter according to claim 1 or 2 or 3, it is characterised in that：The light
Volt inverter is string type inverter.
7. a kind of PID protective devices of photovoltaic DC-to-AC converter according to claim 6, it is characterised in that：The photovoltaic inversion
Device further includes MPPT unit and relay unit, MPPT unit input terminal connect with the photovoltaic array output end, output end with
DC bus connects, and relay unit one end connect with inversion unit output end, the other end and the dummy neutral unit one
End connection.
8. a kind of photovoltaic DC-to-AC converter, it is characterised in that：Include the PID protective devices as described in claim 1-7 is any.
9. a kind of photovoltaic inverting system, it is characterised in that：Including more photovoltaic DC-to-AC converters as claimed in claim 8 in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820300444.0U CN207782746U (en) | 2018-03-05 | 2018-03-05 | A kind of photovoltaic DC-to-AC converter, photovoltaic inverting system and its PID protective devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820300444.0U CN207782746U (en) | 2018-03-05 | 2018-03-05 | A kind of photovoltaic DC-to-AC converter, photovoltaic inverting system and its PID protective devices |
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| Publication Number | Publication Date |
|---|---|
| CN207782746U true CN207782746U (en) | 2018-08-28 |
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| CN201820300444.0U Active CN207782746U (en) | 2018-03-05 | 2018-03-05 | A kind of photovoltaic DC-to-AC converter, photovoltaic inverting system and its PID protective devices |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617126A (en) * | 2019-01-16 | 2019-04-12 | 宁波锦浪新能源科技股份有限公司 | A kind of novel anti-PID device |
-
2018
- 2018-03-05 CN CN201820300444.0U patent/CN207782746U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617126A (en) * | 2019-01-16 | 2019-04-12 | 宁波锦浪新能源科技股份有限公司 | A kind of novel anti-PID device |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231213 Address after: Room 208-38, Hengye Building, No. 100 Xiangxing Road, Xiang'an Industrial Zone, Xiamen Torch High tech Zone, Xiamen, Fujian Province, 361000 Patentee after: Xiamen Kehua shuneng Technology Co.,Ltd. Address before: 361000 unit 02, block B, 2nd floor, 32 shiding street, Siming District, Xiamen City, Fujian Province Patentee before: XIAMEN KEHUA HENGSHENG POWER ENERGY CO.,LTD. Patentee before: ZHANGZHOU KEHUA TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right |