CN106230029B - A kind of photovoltaic generation unit - Google Patents
A kind of photovoltaic generation unit Download PDFInfo
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- CN106230029B CN106230029B CN201610820789.4A CN201610820789A CN106230029B CN 106230029 B CN106230029 B CN 106230029B CN 201610820789 A CN201610820789 A CN 201610820789A CN 106230029 B CN106230029 B CN 106230029B
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- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims description 2
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- 238000010276 construction Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000001914 filtration Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- H02J3/383—
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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
Abstract
The invention discloses a kind of photovoltaic generation units, including sequentially connected transformer, inverter, header box and photovoltaic module；Inverter includes controller and inverter bridge, and inverter bridge one end is connect with transformer, the other end and header box connect；High voltage side of transformer winding is connected by high side switch with external electrical network；Step down side winding includes providing the low-pressure side winding A of power interface, and corresponding leakage inductance per unit value is more than or equal to 5%, and is connected through low-side switch with inverter bridge by its power interface；Inverter includes voltage sampling circuit connected to the controller；Voltage sampling circuit is arranged on high voltage side of transformer winding or step down side winding includes providing the low-pressure side winding B of signaling interface, and voltage sampling circuit is arranged on the signaling interface of low-pressure side winding B.Present invention reduces the circuit cost of photovoltaic generation unit, equipment cost and construction costs.
Description
Technical field
The present invention relates to a kind of photovoltaic generation units.
Background technique
As shown in Figure 1, existing photovoltaic generation unit generally comprise sequentially connected transformer, inverter, header box and
Photovoltaic module.Transformer 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 are connected by high side switch with external electrical network, and low-pressure side winding passes through low
Pressure side switch is connected with inverter.Inverter generally comprises controller, inverter bridge, low tension switch and net side filter etc..Its
Middle inverter bridge is made of power semiconductor, and net side filter is made of filter inductance and filter capacitor, and inverter bridge one end is logical
It crosses net side filter and low tension switch is connected with transformer, the other end is connected by header box with photovoltaic module.
As shown in Fig. 2, the knot that double dual low voltage transformers cooperate two sets of inverters also can be used in existing photovoltaic generation unit
Configuration formula.The structure type and Fig. 1's the difference is that, wherein transformer body part in transformer includes two sets of low-pressure sides
Winding connects two sets of subsystems being made of inverter, header box, photovoltaic module by two low tension switches respectively.
Existing photovoltaic generation unit has following defects that
Firstly, transformer and inverter are independent of one another on circuit in existing photovoltaic generation unit, possess respectively respectively
Panel switches, inverter include complete circuit structure.Due to the transformer circuit and inverter of existing photovoltaic generation unit
Circuit is mutually indepedent, on circuit structure two circuits can not Uniting, the characteristics of can not being combined between circuit, is to circuit
It optimizes, and circuit element is caused to repeat to be arranged, cause circuit structure complicated, circuit cost is high.
Secondly as transformer and inverter are also independent of one another in physical installation, need to be arranged cabinet body independent,
And often need to be laid with longer high-current cable from transformer to inverter, increase photovoltaic generation unit equipment cost and construction
Cost.
With the large-scale development of field of photovoltaic power generation, rate for incorporation into the power network reduces year by year, is equipped to photovoltaic generation unit
Originally, construction cost and O&M efficiency propose increasingly higher demands.The design feature of existing photovoltaic generation unit is filling it
The room for promotion of standby cost, construction cost and O&M efficiency is all by limited.
Summary of the invention
The technical problem to be solved in the present invention is that providing a kind of photovoltaic generation unit, existing photovoltaic generation unit is overcome
Existing transformer, inverter circuit are at high cost, equip cost, the defect of high construction cost.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of photovoltaic generation unit, including successively
Transformer, inverter, header box and the photovoltaic module of connection；The inverter includes controller and inverter bridge, the inverter bridge one end
It is electrically connected with transformer electrical connection, the other end and the header box；The high-pressure side winding of the transformer is opened by high-pressure side
Pass is connected with external electrical network；
It is characterized in that, the low-pressure side winding of the transformer includes providing the low-pressure side winding A of power interface, the low-pressure side
The corresponding leakage inductance per unit value of winding A is more than or equal to 5%, and is connected through low-side switch with the inverter bridge by its power interface
It connects；
The inverter includes the voltage sampling circuit connecting with the controller；The voltage sampling circuit is arranged in the transformation
On the high-pressure side winding of device or the low-pressure side winding of the transformer includes providing the low-pressure side winding B of signaling interface, which adopts
Sample circuit is arranged on the signaling interface of low-pressure side winding B；The low-pressure side winding B is the internal unit of the photovoltaic generation unit
Power supply.
In photovoltaic generation unit of the invention, the header box is to collect the confluence that circuit is constituted by multichannel diode
Case；Or the header box is the header box to be made of DC-DC power translation circuit.
In photovoltaic generation unit of the invention, the low-pressure side winding A be it is a set of, low-pressure side winding A passes through low pressure
Side switch is connected with the inverter bridge.
In photovoltaic generation unit of the invention, the transformer includes at least two sets and respectively provides the low pressure of power interface
Side winding A；The inverter includes the inverter bridge of quantity identical as the low-pressure side winding A of the transformer；It is each described low
Pressure side winding A is connected one to one by corresponding low-side switch and the inverter bridge respectively.
In photovoltaic generation unit of the invention, the transformer has a set of low-pressure side winding A, low-pressure side winding A
Leakage inductance per unit value be more than or equal to the high voltage side of transformer winding leakage inductance per unit value；Or the transformer includes at least two sets low
Side winding A is pressed, the leakage inductance per unit value in parallel of the low-pressure side winding A is more than or equal to the leakage inductance mark of the high voltage side of transformer winding
Value, leakage inductance per unit value in parallel herein are the equivalent leakage inductance per unit value under parallel connection.
In photovoltaic generation unit of the invention, each inversion bridge DC side output end of the inverter is connected in series or simultaneously
Connection connection.
In photovoltaic generation unit of the invention, the voltage of the signaling interface of the step down side winding B is set
Sample circuit is connect through filter circuit with the controller.
In photovoltaic generation unit of the invention, the low-side switch is arranged in the inverter or is arranged described
In transformer.
In photovoltaic generation unit of the invention, the transformer and the inverter layered arrangement or installed with layer arrangement
In a cabinet；The voltage sampling circuit is voltage transformer, voltage hall sensor, resistor voltage divider circuit or linear
Optocoupler.
Implement photovoltaic generation unit of the invention, compared with the prior art, the beneficial effect is that:
1. the transformer of photovoltaic generation unit and inverter circuit are integrated, step down side winding is made full use of
Leakage inductance realizes the filtering of inverter ac side, no setting is required inverter filtering circuit, while reducing the use of low-side switch
Quantity reduces the circuit cost of photovoltaic generation unit；
2. the transformer of photovoltaic generation unit and inverter are commonly mounted in a cabinet, shorten transformer with it is inverse
Become the connection distance between device, high-current cable dosage needed for greatly reducing installation reduces the dress of photovoltaic generation unit
Standby cost and construction cost.
Detailed description of the invention
Fig. 1 is the basic composition schematic diagram of existing photovoltaic generation unit.
Fig. 2 is another composition schematic diagram of existing photovoltaic generation unit.
Fig. 3 is the basic composition schematic diagram of photovoltaic generation unit of the present invention.
Fig. 4 is the system composition schematic diagram of photovoltaic generation unit embodiment one of the present invention.
Fig. 5 is the system composition schematic diagram of photovoltaic generation unit embodiment two of the present invention.
Fig. 6 is the system composition schematic diagram of photovoltaic generation unit embodiment three of the present invention.
The system composition schematic diagram of Fig. 7 photovoltaic generation unit example IV of the present invention.
Fig. 8 a, 8b are the circuit structure diagram embodiments one, two of header box in photovoltaic generation unit of the present invention.
Fig. 9 a, 9b, 9c are the circuit structure diagram embodiments one, two, three of inverter bridge in photovoltaic generation unit of the present invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples:
As shown in figure 3, photovoltaic generation unit of the invention includes sequentially connected transformer, inverter, header box and light
Lie prostrate component.
Inverter includes controller and inverter bridge.Inverter bridge one end and transformer electrical connection, the other end and the header box
Electrical connection.
The high-pressure side winding of transformer is connected by high side switch with external electrical network, and low-pressure side winding includes providing function
The corresponding leakage inductance per unit value of low-pressure side winding A, low-pressure side winding A of rate interface is more than or equal to 5%, by its power interface through low
Pressure side switch is connected with inverter bridge.
Inverter further includes voltage sampling circuit, which is arranged on high voltage side of transformer winding, and with
Controller connection.Or the low-pressure side winding of transformer includes providing the low-pressure side winding B of signaling interface, voltage sampling circuit setting
On the signaling interface of low-pressure side winding B, and it is connect 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 and current on line side filter 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 invention includes sequentially connected transformer, inverter, header box and light
Lie prostrate component.Wherein:
Header box and photovoltaic module are electrically connected.Header box can be using 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 of multi-channel DC-dc power translation circuit；
Above two header box can be used in 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 be using including but not limited to following circuit structure:
(1) two level three phase power translation circuit (as illustrated in fig. 9)
(2) T-type three-level three-phase power conversion circuit (as shown in figure 9b)
(3) I type three-level three-phase power conversion circuit (as is shown in fig. 9 c)
Inverter bridge shown in Fig. 4 uses two level three phase power translation circuits, and one end and transformer are electrically connected, the other end
It is electrically connected with header box.
Transformer 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 corresponding leakage inductance per unit value is set greater than equal to 5%, passes through the inverse of low-side switch and inverter
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 low-pressure side winding A power interface and leakage inductance realize AC-DC energy conversion with
Current on line side filtering, the controller of inverter realize the control of voltage sample and inverter bridge using the signaling interface of low-pressure side winding B
System.As an example, the voltage class of the high-pressure side winding of transformer may be provided at 10kV according to the needs of photovoltaic generation unit,
The voltage class of all kinds of low-pressure side windings may be provided at 300V.
Because the physical distance of transformer and inverter is closer, can integrated installation in the same cabinet body, with the system of saving at
This.Mounting means can same layer arrangement, can also be with layered arrangement.
The inverter bridge of the low-pressure side winding A connection inverter of transformer, need to only be arranged level-one low tension switch therebetween, to save
Distribution cost.Meanwhile the corresponding leakage inductance of low-pressure side winding A of transformer is designed higher, for example, being corresponded to induction reactance mark
Value is arranged 6% or more.It is handed in this way, the inverter bridge of inverter is just realized using the power interface and leakage inductance of low-pressure side winding A
The transformation of stream-DC energy is filtered with current on line side, no setting is required independent filter.
Inverter bridge realizes the filter of AC-DC energy conversion using the corresponding leakage inductance of low-pressure side winding of transformer as it
When wave inductance, the network voltage of inverter bridge i.e. close power grid side before must acquiring the leakage inductance in control.Implementation packet
It includes: 1, voltage sampling circuit being arranged on high voltage side of transformer winding (at this point, can be not provided with low-pressure side winding B)；It 2, will be electric
Pressure sample circuit is arranged on the signaling interface of step down side winding B.Voltage sampling circuit is connect with controller.
In the present embodiment, step down side winding B is only used as detection winding to connect with controller.In other implementations
In example, step down side winding B is connect with controller, while being powered for the internal unit of the photovoltaic generation unit.
Low-side switch can be set in inverter, may also be arranged in transformer.
Embodiment two
As shown in figure 5, the difference of the present embodiment and embodiment is only that: as an example, according to the need of photovoltaic generation unit
It wants, the voltage class of the high-pressure side winding of transformer may be provided at 20kV, and the voltage class of all kinds of low-pressure side windings may be provided at
500V.Inverter bridge uses T-type three-level three-phase power conversion circuit.Header box is made of DC-DC power translation circuit.
Embodiment three
As shown in fig. 6, the present embodiment and the difference of embodiment one are only that:
(1) voltage sampling circuit that low-pressure side winding B signal interface is arranged in is connect through filter circuit with controller.
(2) inverter bridge of inverter uses I type three-level three-phase power conversion circuit, is realized using power interface and leakage inductance
AC-DC energy conversion, and utilize the filter connected on low-pressure side winding A, the leakage inductance of low-pressure side winding B and low-pressure side winding B
Wave capacitor realizes current on line side filtering.At this point it is possible to which it is big that low-pressure side winding A, the leakage inductance per unit value difference of low-pressure side winding B is arranged
In equal to 5%.Net side current filtering can be reinforced with the low-pressure side winding B filter capacitor connecting by being arranged, and improve photovoltaic generation unit
Access the power quality of power grid.
(3) as an example, according to the needs of photovoltaic generation unit, the voltage class of the high-pressure side winding of transformer is settable
In 35kV, the voltage class of low-pressure side winding A may be provided at 750V, and the voltage class of low-pressure side winding B may be provided at 380V.
(4) header box is made of DC-DC power translation circuit.
Example IV
As shown in fig. 7, the present embodiment is basically the same as the first embodiment, difference is only that:
(1) transformer 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
Feel the leakage inductance per unit value that per unit value is more than or equal to high voltage side of transformer winding, leakage inductance per unit value in parallel herein is under parallel connection
Equivalent leakage inductance per unit value；Inverter includes controller and two sets of inverter bridges, after the DC side parallel of two sets of inverter bridges with remittance
Case electrical connection is flowed, the exchange inverter bridge of side one connects through a low-pressure side winding A power of a low-side switch and transformer
Mouth electrical connection.
(2) as an example, according to the needs of photovoltaic generation unit, the voltage class of the high-pressure side winding of transformer is settable
In 35kV, the voltage class of low-pressure side winding A may be provided at 750V, and the voltage class of low-pressure side winding B may be provided at 100V.
(3) identical modulated signal and phase phase difference 180 degree can be used in two inverter bridges of inverter in control
Carrier signal realizes the driving to its power semiconductor, thus using in transformer between two sets of low-pressure side winding A
Leakage inductance realizes that the inside of switching harmonics electric current offsets, and promotes simultaneously network electric energy quality.
(4) each inversion bridge DC side output end of inverter is connected in parallel.
In other embodiments, each inversion bridge DC side output end of inverter can be connected in series.
Claims (9)
1. a kind of photovoltaic generation unit, including sequentially connected transformer, inverter, header box and photovoltaic module；The inverter
Including controller and inverter bridge, the inverter bridge one end and transformer electrical connection, the other end and the header box are electrically connected；It should
The high-pressure side winding of transformer is connected by high side switch with external electrical network；
It is characterized in that, the low-pressure side winding of the transformer includes providing the low-pressure side winding A of power interface, the low-pressure side winding
The corresponding leakage inductance per unit value of A is more than or equal to 5%, and is connected through low-side switch with the inverter bridge by its power interface；
The inverter includes the voltage sampling circuit connecting with the controller；The transformer is arranged in the voltage sampling circuit
On the winding of high-pressure side；Or the low-pressure side winding of the transformer includes providing the low-pressure side winding B of signaling interface, voltage sample electricity
Road is arranged on the signaling interface of low-pressure side winding B；The low-pressure side winding B is that the internal unit of the photovoltaic generation unit supplies
Electricity.
2. photovoltaic generation unit as described in claim 1, which is characterized 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 of DC-DC power translation circuit.
3. photovoltaic generation unit as described in claim 1, which is characterized in that the low-pressure side winding A is a set of, the low-pressure side
Winding A is connected by low-side switch with the inverter bridge.
4. photovoltaic generation unit as described in claim 1, which is characterized in that the transformer includes at least two sets and respectively provides
The low-pressure side winding A of power interface；The inverter includes the described inverse of quantity identical as the low-pressure side winding A of the transformer
Become bridge；Each low-pressure side winding A is connected one to one by corresponding low-side switch and the inverter bridge respectively.
5. photovoltaic generation unit as described in claim 1, which is characterized in that the transformer has a set of low-pressure side winding A,
The leakage inductance per unit value of low-pressure side winding A is more than or equal to the leakage inductance per unit value of the high voltage side of transformer winding；Or the transformer
Leakage inductance per unit value in parallel including at least two sets low-pressure side windings A, the low-pressure side winding A is more than or equal to the high voltage side of transformer
The leakage inductance per unit value of winding.
6. photovoltaic generation unit as claimed in claim 4, which is characterized in that each inversion bridge DC side of the inverter exports
End is connected in series or is connected in parallel.
7. photovoltaic generation unit as described in claim 1, which is characterized in that setting is believed in the step down side winding B
The voltage sampling circuit of number interface is connect through filter circuit with the controller.
8. the photovoltaic generation unit as described in one of claim 1 to 7, which is characterized in that the low-side switch is arranged in institute
It states in inverter or is arranged in the transformer.
9. the photovoltaic generation unit as described in one of claim 1 to 7, which is characterized in that the transformer and the inverter
Layered arrangement is mounted in a cabinet with layer arrangement；The voltage sampling circuit is voltage transformer, voltage hall sensing
Device, resistor voltage divider circuit or linear optical coupling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610820789.4A CN106230029B (en) | 2016-09-12 | 2016-09-12 | A kind of photovoltaic generation unit |
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| CN201610820789.4A CN106230029B (en) | 2016-09-12 | 2016-09-12 | A kind of photovoltaic generation unit |
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| CN106230029A CN106230029A (en) | 2016-12-14 |
| CN106230029B true CN106230029B (en) | 2019-10-15 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204668964U (en) * | 2015-04-17 | 2015-09-23 | 广东明阳龙源电力电子有限公司 | A kind of photovoltaic inversion is boosted integrated generating main circuit topological structure |
| CN105245092A (en) * | 2015-10-08 | 2016-01-13 | 青岛派克能源有限公司 | Pulse width modulation (PWM) rectifier using transformer leakage inductance as LCL filtering |
| CN206117182U (en) * | 2016-09-12 | 2017-04-19 | 深圳市长昊机电有限公司 | Photovoltaic power generation unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130285453A1 (en) * | 2012-04-26 | 2013-10-31 | Sunsource Grids, Inc. | Method and apparatus for seamless power transfer |
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2016
- 2016-09-12 CN CN201610820789.4A patent/CN106230029B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204668964U (en) * | 2015-04-17 | 2015-09-23 | 广东明阳龙源电力电子有限公司 | A kind of photovoltaic inversion is boosted integrated generating main circuit topological structure |
| CN105245092A (en) * | 2015-10-08 | 2016-01-13 | 青岛派克能源有限公司 | Pulse width modulation (PWM) rectifier using transformer leakage inductance as LCL filtering |
| CN206117182U (en) * | 2016-09-12 | 2017-04-19 | 深圳市长昊机电有限公司 | Photovoltaic power generation unit |
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Effective date of registration: 20200910 Address after: Room 609, west block, 6 / F, Tian'an Innovation Technology Plaza (phase II), intersection of Binhe Road and Xiangmihu Road, Tian'an community, Shatou street, Futian District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN HOPEWIND ELECTRIC Co.,Ltd. Address before: 6 A2 District, 1 Yanshan Avenue, Yan Chuan community, Songgang street, Baoan District, Shenzhen, Guangdong 518000, China Patentee before: SHENZHEN CHANGHAO MECHANICAL AND ELECTRICAL Co.,Ltd. |