CN206117182U - Photovoltaic power generation unit - Google Patents
Photovoltaic power generation unit Download PDFInfo
- Publication number
- CN206117182U CN206117182U CN201621050615.6U CN201621050615U CN206117182U CN 206117182 U CN206117182 U CN 206117182U CN 201621050615 U CN201621050615 U CN 201621050615U CN 206117182 U CN206117182 U CN 206117182U
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- China
- Prior art keywords
- low
- side winding
- pressure side
- generation unit
- transformator
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses a photovoltaic power generation unit, including transformer, dc -to -ac converter, collection flow box and the photovoltaic module who connects gradually, the dc -to -ac converter includes controller and contravariant bridge, and contravariant bridge one end is connected with the transformer, the other end is connected with collection flow box, transformer high -pressure side winding is connected with outside electric wire netting through the high -pressure side switch, the transformer low voltage side winding is including the low tension side winding A who provides power interface, its leakage inductance per -unit value more than or equal to 5% who corresponds to be connected with the contravariant bridge through low - voltage switch through its power interface, the dc -to -ac converter includes the voltage sampling circuit who is connected with the controller, voltage sampling circuit sets up on transformer high -pressure side winding, or the transformer low voltage side winding is including the low tension side winding B who provides signal interface, and voltage sampling circuit sets up on low tension side winding B's signal interface. The utility model discloses photovoltaic power generation unit's circuit cost, equipment cost and construction cost have been reduced.
Description
Technical field
This utility model is related to a kind of photovoltaic generation unit.
Background technology
As shown in figure 1, existing photovoltaic generation unit generally comprise be sequentially connected transformator, inverter, header box and
Photovoltaic module.Transformator generally comprises high side switch, transformer body and low-side switch；Transformer body by high-pressure side around
Group and low-pressure side winding composition, high-pressure side winding is connected by high side switch with external electrical network, and low-pressure side winding is by low
Pressure side switch is connected with inverter.Inverter generally comprises controller, inverter bridge, low tension switch and net side wave filter etc..Its
Middle inverter bridge is made up of power semiconductor, and net side wave filter is made up of filter inductance and filter capacitor, and inverter bridge one end leads to
Cross net side wave filter and low tension switch is connected with transformator, the other end is connected by header box with photovoltaic module.
As shown in Fig. 2 existing photovoltaic generation unit can also adopt double dual low voltage transformers to coordinate the knot of two sets of inverters
Configuration formula.The version is with the difference of Fig. 1, wherein, the transformer body part in transformator includes two sets of low-pressure sides
Winding, connects two sets of subsystems being made up of inverter, header box, photovoltaic module by two low tension switches respectively.
There is following defect in existing photovoltaic generation unit：
First, in existing photovoltaic generation unit, transformator and inverter are independent of one another on circuit, possess respectively each
Panel switches, inverter include complete circuit structure.Due to the transformer circuit and inverter of existing photovoltaic generation unit
Circuit is separate, and two circuits cannot Uniting on circuit structure, it is impossible to which the characteristics of being combined between circuit is to circuit
It is optimized, and causes component to repeat to arrange, cause circuit structure complicated, circuit cost is high.
Secondly as transformator and inverter are also independent of one another in physical installation, need to arrange each independent cabinet,
And often need to lay longer high-current cable from transformator to inverter, increased photovoltaic generation unit equipment cost and construction
Cost.
As the large-scale development of field of photovoltaic power generation, rate for incorporation into the power network are reduced year by year, photovoltaic generation unit is equipped to
Originally, construction cost and O＆M efficiency propose higher and higher requirement.The construction featuress of existing photovoltaic generation unit so as in dress
The room for promotion of standby cost, construction cost and O＆M efficiency is all subject to limited.
Utility model content
The technical problems to be solved in the utility model is, there is provided a kind of photovoltaic generation unit, overcomes existing photovoltaic generation
The high defect of the transformator of unit presence, inverter circuit high cost, equipment cost, construction cost.
This utility model solves the technical scheme that its technical problem adopted：A kind of photovoltaic generation unit is constructed, including
Transformator, inverter, header box and the photovoltaic module being sequentially connected；The inverter includes controller and inverter bridge, the inverter bridge
One end and the transformator electrical connection, the other end and the header box electrical connection；The high-pressure side winding of the transformator passes through high pressure
Side switch is connected with external electrical network；
Characterized in that, the low-pressure side winding of the transformator includes providing the low-pressure side winding A of power interface, the low-pressure side
The corresponding leakage inductance perunit values of winding A are more than or equal to 5%, and are connected with the inverter bridge by its power interface Jing low-side switch
Connect；
The inverter includes the voltage sampling circuit being connected with the controller；The voltage sampling circuit is arranged on the transformation
On the high-pressure side winding of device, or the low-pressure side winding of the transformator includes providing the low-pressure side winding B of signaling interface, and the voltage is adopted
Sample circuit is arranged on the signaling interface of low-pressure side winding B.
In photovoltaic generation unit of the present utility model, the header box is to be collected the remittance that circuit is constituted by multichannel diode
Stream case；Or the header box is the header box being made up of DC-DC power translation circuit.
In photovoltaic generation unit of the present utility model, the transformator has a set of low-pressure side winding A, the low-pressure side around
Group A is connected by low-side switch with the inverter bridge.
In photovoltaic generation unit of the present utility model, the transformator includes that at least two sets each provide power interface
Low-pressure side winding A；The inverter includes the inverter bridge with the low-pressure side winding A equal numbers of the transformator；Each institute
State low-pressure side winding A to connect one to one with the inverter bridge by corresponding low-side switch respectively.
In photovoltaic generation unit of the present utility model, the transformator has a set of low-pressure side winding A, the low-pressure side around
Leakage inductance perunit value of the leakage inductance perunit value of group A more than or equal to the high voltage side of transformer winding；Or the transformator includes at least two
Leakage inductance of the leakage inductance perunit value in parallel of set low-pressure side winding A, the low-pressure side winding A more than or equal to the high voltage side of transformer winding
Perunit value, leakage inductance perunit value in parallel herein is the equivalent leakage inductance perunit value under parallel connection.
In photovoltaic generation unit of the present utility model, each inversion bridge DC side outfan of the inverter is connected in series
Or be connected in parallel.
In photovoltaic generation unit of the present utility model, the signaling interface of the step down side winding B is arranged on
The filtered circuit of voltage sampling circuit is connected with the controller.
In photovoltaic generation unit of the present utility model, the step down side winding B is connected with the controller, together
When be that the internal unit of the photovoltaic generation unit is powered.
In photovoltaic generation unit of the present utility model, the low-side switch is arranged in the inverter or is arranged on
In the transformator.
In photovoltaic generation unit of the present utility model, the transformator and the inverter layered arrangement or arrange with layer
In a rack；The voltage sampling circuit be voltage transformer, voltage hall sensor, resistor voltage divider circuit or
Linear optical coupling.
Implement photovoltaic generation unit of the present utility model, compared with the prior art, its advantage is：
1. the transformator and inverter circuit of photovoltaic generation unit are carried out integrated, make full use of step down side winding
Leakage inductance realizes the filtering of inverter ac side, without the need for arranging inverter filtering circuit, while reducing the use of low-side switch
Quantity, reduces the circuit cost of photovoltaic generation unit；
2. the transformator and inverter of photovoltaic generation unit are commonly mounted in a rack, shorten transformator with it is inverse
Become the connection distance between device, greatly reduce the high-current cable consumption needed for installing, reduce the dress of photovoltaic generation unit
Standby cost and construction cost.
Description of the drawings
Fig. 1 is the basic composition schematic diagram of existing photovoltaic generation unit.
Fig. 2 is another kind of composition schematic diagram of existing photovoltaic generation unit.
Fig. 3 is the basic composition schematic diagram of this utility model photovoltaic generation unit.
Fig. 4 is the system composition schematic diagram of this utility model photovoltaic generation unit embodiment one.
Fig. 5 is the system composition schematic diagram of this utility model photovoltaic generation unit embodiment two.
Fig. 6 is the system composition schematic diagram of this utility model photovoltaic generation unit embodiment three.
The system composition schematic diagram of Fig. 7 this utility model photovoltaic generation unit example IVs.
Fig. 8 a, 8b are the circuit structure diagram embodiments one, two of header box in this utility model photovoltaic generation unit.
Fig. 9 a, 9b, 9c be inverter bridge in this utility model photovoltaic generation unit circuit structure diagram embodiment one, two,
Three.
Specific embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail：
As shown in figure 3, photovoltaic generation unit of the present utility model includes transformator, inverter, the header box being sequentially connected
And photovoltaic module.
Inverter includes controller and inverter bridge.Inverter bridge one end and transformator electrical connection, the other end and the header box
Electrical connection.
The high-pressure side winding of transformator is connected by high side switch with external electrical network, and low-pressure side winding includes providing work(
The corresponding leakage inductance perunit value of the low-pressure side winding A of rate interface, low-pressure side winding A is low by its power interface Jing more than or equal to 5%
Pressure side switch is connected with inverter bridge.
Inverter also includes voltage sampling circuit, and the voltage sampling circuit is arranged on high voltage side of transformer winding, and with
Controller connects.Or the low-pressure side winding of transformator includes providing the low-pressure side winding B of signaling interface, voltage sampling circuit is arranged
On the signaling interface of low-pressure side winding B, and it is connected with controller.
Voltage sampling circuit is the element for obtaining information of voltage, including but not limited to voltage transformer, voltage hall sensing
Device, resistor voltage divider circuit or linear optical coupling etc..
The inverter bridge of inverter realizes that AC-DC energy conversion is filtered with current on line side using power interface and leakage inductance,
The controller of inverter realizes voltage sample and the control to inverter bridge using voltage sampling circuit.
Embodiment one
As shown in figure 4, photovoltaic generation unit of the present utility model includes transformator, inverter, the header box being sequentially connected
And photovoltaic module.Wherein：
Header box is electrically connected with photovoltaic module.Header box can adopt including but not limited to following circuit structure：
(1) header box (as shown in Figure 8 a) that circuit is constituted is collected by multichannel diode；
(2) header box (as shown in Figure 8 b) being made up of multi-channel DC-dc power translation circuit；
Above two header box can be used with same photovoltaic generating system.The present embodiment is collected using multichannel diode
The header box that circuit is constituted.
Inverter includes controller and inverter bridge.Inverter bridge can adopt including but not limited to following circuit structure：
(1) two level three phase power translation circuit (as illustrated in fig. 9)
(2) T-shaped three-level three-phase power conversion circuit (as shown in figure 9b)
(3) I types three-level three-phase power conversion circuit (as is shown in fig. 9 c)
Inverter bridge shown in Fig. 4 adopts two level three phase power translation circuits, its one end to be electrically connected with transformator, the other end
With header box electrical connection.
Transformator includes high side switch, transformer body and low-side switch.Transformer body includes high-pressure side winding
At least two class low-pressure side windings.Wherein, high-pressure side winding is connected by high side switch with external electrical network；Low-pressure side winding
A provides power interface, and its corresponding leakage inductance perunit value is set greater than equal to 5%, inverse with inverter by low-side switch
Become bridging to connect；Low-pressure side winding B provides signaling interface, is connected with the controller of inverter.
The inverter bridge of inverter using the power interface and leakage inductance of low-pressure side winding A realize AC-DC energy conversion with
Current on line side is filtered, and the controller of inverter realizes the control of voltage sample and inverter bridge using the signaling interface of low-pressure side winding B
System.As an example, according to the needs of photovoltaic generation unit, the electric pressure of the high-pressure side winding of transformator may be provided at 10kV,
The electric pressure of all kinds of low-pressure side windings may be provided at 300V.
Because the physical distance of transformator and inverter it is nearer, can integrated installation in same cabinet, with the system of saving into
This.Mounting means can be arranged with layer, it is also possible to layered arrangement.
The low-pressure side winding A of transformator connects the inverter bridge of inverter, and one-level low tension switch need to be only arranged therebetween, to save
Distribution cost.Meanwhile, the corresponding leakage inductances of low-pressure side winding A of transformator are designed to higher, for example, corresponded to induction reactance perunit
Value is arranged on more than 6%.So, the inverter bridge of inverter just is realized handing over using the power interface and leakage inductance of low-pressure side winding A
Stream-DC energy is converted and current on line side filtering, without the need for arranging independent wave filter.
Inverter bridge realizes the filter of AC-DC energy conversion by the use of the corresponding leakage inductance of low-pressure side winding of transformator as it
During ripple inductance, the line voltage of inverter bridge i.e. close electrical network side before must gathering the leakage inductance in control.Implementation bag
Include：1st, voltage sampling circuit is arranged on high voltage side of transformer winding (now, can be not provided with low-pressure side winding B)；2nd, by electricity
Pressure sample circuit is arranged on the signaling interface of step down side winding B.Voltage sampling circuit is connected with controller.
In the present embodiment, step down side winding B is only connected as detection winding with controller.In other enforcements
In example, step down side winding B is connected with controller, while the internal unit for the photovoltaic generation unit is powered.
Low-side switch can be arranged in inverter, may also be arranged in transformator.
Embodiment two
As shown in figure 5, the present embodiment and embodiment are differed only in：As an example, according to the need of photovoltaic generation unit
Will, the electric pressure of the high-pressure side winding of transformator may be provided at 20kV, and the electric pressure of all kinds of low-pressure side windings may be provided at
500V.Inverter bridge adopts T-shaped three-level three-phase power conversion circuit.Header box is made up of DC-DC power translation circuit.
Embodiment three
As shown in fig. 6, the present embodiment and embodiment one are differed only in：
(1) the filtered circuit of voltage sampling circuit for being arranged on low-pressure side winding B signal interface is connected with controller.
(2) inverter bridge of inverter adopts I type three-level three-phase power conversion circuits, is realized using power interface and leakage inductance
AC-DC energy conversion, and using the filter connected on low-pressure side winding A, the leakage inductance of low-pressure side winding B and low-pressure side winding B
Ripple electric capacity realizes that current on line side is filtered.At this point it is possible to arrange low-pressure side winding A, the leakage inductance perunit value of low-pressure side winding B distinguishes big
In equal to 5%.The filter capacitor that setting is connected with low-pressure side winding B can strengthen net side current filtering, improve photovoltaic generation unit
Access the quality of power supply of electrical network.
(3) as an example, according to the needs of photovoltaic generation unit, the electric pressure of the high-pressure side winding of transformator can be arranged
In 35kV, the electric pressure of low-pressure side winding A may be provided at 750V, and the electric pressure of low-pressure side winding B may be provided at 380V.
(4) header box is made up of DC-DC power translation circuit.
Example IV
As shown in fig. 7, the present embodiment is essentially identical with embodiment one, differ only in：
(1) transformator includes two sets of low-pressure side winding A and two sets of low-side switch, the leakage in parallel of two sets of low-pressure side winding A
More than or equal to the leakage inductance perunit value of high voltage side of transformer winding, leakage inductance perunit value in parallel herein is under parallel connection to sense perunit value
Equivalent leakage inductance perunit value；Inverter includes controller and two sets of inverter bridges, with remittance after the DC side parallel of two sets of inverter bridges
Stream case electrical connection, the low-side switch of inverter bridge Jing mono- of AC one connects with a low-pressure side winding A power of transformator
Mouth electrical connection.
(2) as an example, according to the needs of photovoltaic generation unit, the electric pressure of the high-pressure side winding of transformator can be arranged
In 35kV, the electric pressure of low-pressure side winding A may be provided at 750V, and the electric pressure of low-pressure side winding B may be provided at 100V.
(3) two inverter bridges of inverter can adopt identical modulated signal and phase 180 degree in control
Carrier signal realizing the driving to its power semiconductor, so as to using in transformator between two sets of low-pressure side winding A
Leakage inductance realizes that the inside of switching harmonics electric current offsets, and is lifted and network electric energy quality.
(4) each inversion bridge DC side outfan of inverter is connected in parallel.
In other embodiments, each inversion bridge DC side outfan of inverter can be connected in series.
Claims (10)
1. a kind of photovoltaic generation unit, including the transformator, inverter, header box and the photovoltaic module that are sequentially connected；The inverter
Including controller and inverter bridge, the inverter bridge one end is electrically connected with transformator electrical connection, the other end and the header box；Should
The high-pressure side winding of transformator is connected by high side switch with external electrical network；
Characterized in that, the low-pressure side winding of the transformator includes providing the low-pressure side winding A of power interface, the low-pressure side winding
The corresponding leakage inductance perunit values of A are more than or equal to 5%, and are connected with the inverter bridge by its power interface Jing low-side switch；
The inverter includes the voltage sampling circuit being connected with the controller；The voltage sampling circuit is arranged on the transformator
On the winding of high-pressure side, or the low-pressure side winding of the transformator includes providing the low-pressure side winding B of signaling interface, the voltage sample electricity
Road is arranged on the signaling interface of low-pressure side winding B.
2. photovoltaic generation unit as claimed in claim 1, it is characterised in that the header box is to collect electricity by multichannel diode
The header box that road is constituted；Or the header box is the header box being made up of DC-DC power translation circuit.
3. photovoltaic generation unit as claimed in claim 1, it is characterised in that the transformator has a set of low-pressure side winding A,
The low-pressure side winding A is connected by low-side switch with the inverter bridge.
4. photovoltaic generation unit as claimed in claim 1, it is characterised in that the transformator includes at least two sets each offers
The low-pressure side winding A of power interface；The inverter includes described inverse with the low-pressure side winding A equal numbers of the transformator
Become bridge；Each low-pressure side winding A is connected one to one respectively by corresponding low-side switch with the inverter bridge.
5. photovoltaic generation unit as claimed in claim 1, it is characterised in that the transformator has a set of low-pressure side winding A,
Leakage inductance perunit value of the leakage inductance perunit value of low-pressure side winding A more than or equal to the high voltage side of transformer winding；Or the transformator
Including at least two sets low-pressure side winding A, the leakage inductance perunit value in parallel of the low-pressure side winding A is more than or equal to the high voltage side of transformer
The leakage inductance perunit value of winding.
6. photovoltaic generation unit as claimed in claim 4, it is characterised in that each inversion bridge DC side output of the inverter
End is connected in series or is connected in parallel.
7. photovoltaic generation unit as claimed in claim 1, it is characterised in that be arranged on the step down side winding B letters
The filtered circuit of voltage sampling circuit of number interface is connected with the controller.
8. photovoltaic generation unit as claimed in claim 1, it is characterised in that the step down side winding B and the control
Device connection processed, while the internal unit for the photovoltaic generation unit is powered.
9. the photovoltaic generation unit as described in one of claim 1 to 7, it is characterised in that the low-side switch is arranged on institute
State in inverter or be arranged in the transformator.
10. the photovoltaic generation unit as described in one of claim 1 to 7, it is characterised in that the transformator and the inverter
Layered arrangement is arranged in a rack with layer arrangement；The voltage sampling circuit is voltage transformer, voltage hall sensing
Device, resistor voltage divider circuit or linear optical coupling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621050615.6U CN206117182U (en) | 2016-09-12 | 2016-09-12 | Photovoltaic power generation unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621050615.6U CN206117182U (en) | 2016-09-12 | 2016-09-12 | Photovoltaic power generation unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206117182U true CN206117182U (en) | 2017-04-19 |
Family
ID=58519951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621050615.6U Withdrawn - After Issue CN206117182U (en) | 2016-09-12 | 2016-09-12 | Photovoltaic power generation unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206117182U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106230029A (en) * | 2016-09-12 | 2016-12-14 | 深圳市长昊机电有限公司 | A kind of photovoltaic generation unit |
-
2016
- 2016-09-12 CN CN201621050615.6U patent/CN206117182U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106230029A (en) * | 2016-09-12 | 2016-12-14 | 深圳市长昊机电有限公司 | A kind of photovoltaic generation unit |
| CN106230029B (en) * | 2016-09-12 | 2019-10-15 | 深圳市长昊机电有限公司 | A kind of photovoltaic generation unit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170419 Effective date of abandoning: 20191015 |
|
| AV01 | Patent right actively abandoned |