CN108539782A - A kind of photovoltaic generating system - Google Patents
A kind of photovoltaic generating system Download PDFInfo
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- CN108539782A CN108539782A CN201810289013.3A CN201810289013A CN108539782A CN 108539782 A CN108539782 A CN 108539782A CN 201810289013 A CN201810289013 A CN 201810289013A CN 108539782 A CN108539782 A CN 108539782A
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- H02J3/385—
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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 present invention provides a kind of photovoltaic generating system, including at least one optimizer group and three with the grid-connected circuitry phase of star or delta connection, each optimizer group includes at least one optimizer, and it is realized the MPPT controls of DC power supply by the optimizer respectively connected respectively, the high_voltage isolation type DC/DC converters in each circuitry phase are made to no longer need to carry out MPPT controls and real-time pressure regulation to the photovoltaic panel connected, therefore the gain ranging of high_voltage isolation type DC/DC converters can take smaller value, and then the efficiency of high_voltage isolation type DC/DC converters is made further to be promoted compared with prior art.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more particularly to a kind of photovoltaic generating system.
Background technology
In field of photovoltaic power generation, with the development of power electronic technique, solid-state transformer, one kind based on power semiconductor and
Device that the components such as capacitor and inductor are built, at least having power transformer isolation and transformation function, is furtherd investigate
Gradually promote；And inverter and solid-state transformer are integrated into an entirety, referred to as photovoltaic solid-state transformer, because with collaboration
Effect, overall efficiency are higher than simple solid-state transformer, become the research direction of numerous scholar experts.
Photovoltaic solid-state transformer in the prior art is made of DC/DC and DC/AC, wherein DC/DC generally uses isolated form
DC/DC converters control for realizing the MPPT of connected photovoltaic panel；DC/AC, main circuit generally use H bridge topologys, are used for
It controls grid-connected current and corresponding DC bus-bar voltage is constant.
In the program, have wider due to the influence of the factors such as photovoltaic panel MPPT voltages are illuminated by the light, battery plate temperature
Variation range, isolated form DC/DC converters are realized just needs real-time pressure regulation to connected photovoltaic panel MPPT controls, and its output is electric
Pressure is controlled by rear class H bridges into steady state value, therefore the input and output voltage gain of isolated form DC/DC converters needs wider model
It encloses, still, the efficiency of such isolated form DC/DC converters is difficult to do height.
Invention content
The present invention provides a kind of photovoltaic generating system, low to solve isolated form DC/DC transducer effciencies in the prior art
Problem.
To achieve the above object, technical solution provided by the present application is as follows：
A kind of photovoltaic generating system, including at least one optimizer group and the circuitry phase of three stars or delta connection,
The circuitry phase includes：Filter module, multiple cascade modules and multiple high_voltage isolation type DC/DC converters；Wherein：
The output end of each cascade module cascades, and cascade one end is connected with the input terminal of the filter module, grade
An output end of the other end of connection as the circuitry phase；
Another output end of the output end of the filter module as the circuitry phase；
The input terminal of the cascade module is connected with the output end of at least one high_voltage isolation type DC/DC converters；
The input terminal of each high_voltage isolation type DC/DC converters respectively with corresponding at least one optimization
The output end of device group is connected；Alternatively, the input terminal of each high_voltage isolation type DC/DC converters is parallel to common DC bus
It is connected later with the output end of at least one optimizer group；
The optimizer group includes at least one optimizer, the output end series connection of multiple optimizers, concatenated both ends
For the output end of the optimizer group, the input terminal of the optimizer is connected with DC power supply；
MPPT maximum power point tracking MPPT controls are realized by the optimizer.
Preferably, the gain ranging of the high_voltage isolation type DC/DC converters is more than or equal to 1 and is less than 1.5.
Preferably, the main circuit in the high_voltage isolation type DC/DC converters is：LC serial-resonants topology, LLC series connection
Resonant mode topology, power bi-directional LC serial-resonants topology, power bi-directional LLC serial-resonants topology, double active DC/DC topologys
And any one in full-bridge DC/DC topologys；
And the main circuit in the high_voltage isolation type DC/DC converters includes：High frequency transformer.
Preferably, the cascade module is：H bridges topology, NPC full-bridge topologies, NPC half-bridge topologies, ANPC full-bridge topologies,
ANPC half-bridge topologies, T-type full-bridge topology, T-type tri-level half-bridge topology, five Level Full Bridge of striding capacitance full-bridge topology and mixed type
Any one in topology；
And the cascade module controls the ratio between maxima and minima of itself input terminal voltage and is less than or equal to 1.2.
Preferably, further include：At least one header box, the header box be used for the output of the optimizer group connected into
Row confluence, then the direct current energy after confluence is exported to corresponding high_voltage isolation type DC/DC converters or described public
DC bus.
Preferably, the DC power supply that each optimizer is connected is at least one photovoltaic module；Alternatively,
The DC power supply that each optimizer is connected at least one parallel branch is at least one photovoltaic module, and at least
The DC power supply that each optimizer is connected in one parallel branch is accumulator；The parallel branch be include that multiple parallel connections are excellent
Change the branch of device group.
Preferably, the optimizer is non-isolated DC/DC converters.
Preferably, further include：System communication module, system detectio module, system accessory power supply and at least one system control
Device processed；
The system controller for realizing three circuitry phases cutting-in control；
The system detectio module is for realizing the voltage of the photovoltaic generating system, electric current, temperature and arc-detection；
The system communication module is for realizing the system controller and three circuitry phases and extraneous communication；
The system accessory power supply is used for as the system communication module, the system detectio module and system control
Device is powered.
Preferably, the cascade module includes：Main circuit, communication module, detection module, accessory power supply and at least one control
Device processed；
The controller is used to control the switching tube action in the main circuit, realizes MPPT controls；
The detection module is for realizing the voltage of the cascade module, electric current, temperature and arc-detection；
The communication module is for realizing the communication between the controller and the system controller；
The accessory power supply is used for as the communication module, the detection module and controller power supply.
Preferably, the high_voltage isolation type DC/DC converters include：Main circuit, communication module, detection module, auxiliary electricity
Source and at least one controller；
The controller is used to detect and export the state of the high_voltage isolation type DC/DC converters；
The detection module is examined for realizing the voltage of the high_voltage isolation type DC/DC converters, electric current, temperature and electric arc
It surveys；
The communication module is for realizing the controller and the system controller or the high_voltage isolation type DC/DC
Communication between the cascade module that converter is connected；
The accessory power supply is used for as the communication module, the detection module and controller power supply.
Photovoltaic generating system provided by the invention, including at least one optimizer group and three are with star or delta connection
Grid-connected circuitry phase, each optimizer group includes at least one optimizer, and it controls difference for the MPPT of DC power supply
It is realized by the optimizer respectively connected, the high_voltage isolation type DC/DC converters in each circuitry phase is made to no longer need to connecting
The photovoltaic panel that connects carries out MPPT controls and real-time pressure regulation, thus the gain ranging of high_voltage isolation type DC/DC converters can take compared with
Small value, and then the efficiency of high_voltage isolation type DC/DC converters is made further to be promoted compared with prior art.
Description of the drawings
Technical solution in order to illustrate the embodiments of the present invention more clearly or in the prior art to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, it is only this that interior attached drawing, which is described below,
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 a to Fig. 2 b are four kinds of structural schematic diagrams of the main circuit of photovoltaic generating system provided in an embodiment of the present invention；
Fig. 3 a to Fig. 3 d are four kinds of electricity of the main circuit in high_voltage isolation type DC/DC converters provided in an embodiment of the present invention
Road schematic diagram；
Fig. 4 is a kind of circuit diagram of the main circuit in cascade module provided in an embodiment of the present invention；
Fig. 5 a to Fig. 5 c are three kinds of circuit diagrams of the main circuit in filter module provided in an embodiment of the present invention；
Fig. 6 a and Fig. 6 b are other two kinds of structural representations of the main circuit of photovoltaic generating system provided in an embodiment of the present invention
Figure.
Specific implementation mode
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall in the protection scope of this application.
The present invention provides a kind of photovoltaic generating system, low to solve isolated form DC/DC transducer effciencies in the prior art
Problem.
Specifically, the photovoltaic generating system, including at least one optimizer group and three circuitry phases, and three circuitry phases can
Can also be delta connection shown in Fig. 1 b and Fig. 2 b to be star connection shown in Fig. 1 a and Fig. 2 a；Referring to Fig. 1 a to figure
2b, the circuitry phase include：Filter module 103, multiple cascade modules 102 and multiple high_voltage isolation type DC/DC converters 101；Its
In：
The output end of each cascade module 102 cascades, and cascade one end is connected with the input terminal of filter module 103, cascades
An output end of the other end as circuitry phase；
Another output end of the output end of filter module 103 as circuitry phase；
The input terminal of cascade module 102 is connected with the output end of at least one high_voltage isolation type DC/DC converters 101；
The input terminal of each high_voltage isolation type DC/DC converters 101 respectively with corresponding at least one optimizer group
Output end be connected, as in fig. la and lb, the input terminals of each high_voltage isolation type DC/DC converters 101 is respectively with one
A parallel branch is connected, which includes the optimizer group of multiple parallel connections；Alternatively, each high_voltage isolation type DC/DC transformation
The input terminal of device 101 is connected after being parallel to common DC bus with the output end of at least one optimizer group, such as Fig. 2 a and figure
Shown in 2b, at least one parallel branch accesses common DC bus, which includes the optimizer group of multiple parallel connections；When
When the parallel branch for accessing common DC bus is multiple, the specification of each parallel branch is identical；
Optimizer group includes at least one optimizer, and the output end series connection of multiple optimizers, concatenated both ends are optimizer
The output end of group, the input terminal of optimizer are connected with DC power supply；
MPPT (Maximum Power Point Tracking, MPPT maximum power point tracking) controls are realized by the optimizer.
In specific actual design process, since the MPPT control functions of DC/DC converters will be belonged in the prior art
Corresponding optimizer is transferred to so that high_voltage isolation type DC/DC converters 101 no longer need to carry out the photovoltaic panel connected
MPPT is controlled and real-time pressure regulation, makes its gain ranging, i.e. gain maximum divided by output of the output voltage with input voltage ratio
The quotient that voltage is worth to the gain minimum of input voltage ratio, what can be designed is smaller, and then high_voltage isolation type DC/DC is made to become
The efficiency of parallel operation 101 is further promoted compared with prior art, and to improve system effectiveness, peak efficiency will be greater than
98.5%.
Specifically, due to the use of optimizer, the gain ranging of high_voltage isolation type DC/DC converters 101 can be made big
In equal to 1 and being less than 1.5, for example designed at 1.5 times or less, it might even be possible to by high_voltage isolation type DC/DC converters 101
It is designed to fixed gain, makees opened loop control, therefore simplify the control function of high_voltage isolation type DC/DC converters 101, reduce
The design difficulty of high_voltage isolation type DC/DC converters 101.Meanwhile the reduction of above-mentioned gain ranging just directly reduce high pressure every
The pressure of release 101 medium/high frequency transformer of DC/DC converters.In addition, the application of optimizer also solves original, there are one direct current mothers
Line corresponds to the single existing component connection in series-parallel mismatch problems of MPPT controls, realizes component level MPPT controls, improves system hair
Electricity can also be accomplished to be monitored each photovoltaic module.And whole system scheme is close compared to conventional system hoisting power
Degree.
Optionally, which is non-isolated DC/DC converters.
Preferably, the main circuit in high_voltage isolation type DC/DC converters 101 includes：High frequency transformer, and high frequency transformation
Isolation voltage grade between the secondary side of original of device is more than 10kV so that the DC power supply that the photovoltaic generating system can will be connected
In electric energy be incorporated to mesohigh power grid；Voltage class between its former secondary side can be set according to specific application environment,
To adapt to different photovoltaic system applications；It is not specifically limited herein, within the scope of protection of this application.
Also, in practical application, the main circuit in high_voltage isolation type DC/DC converters 101 can be：LC series resonances
Formula topology (as shown in Figure 3a), LLC serial-resonants topological (as shown in Figure 3b), double active DC/DC topologys (as shown in Figure 3c),
Full-bridge DC/DC topological (as shown in Figure 3d), power bi-directional LC serial-resonants topological (not illustrated) and power bi-directional LLC strings
Join any one in resonant mode topological (not illustrated)；Certainly, also visual its concrete application environmental selection other forms
Topology is not specifically limited herein, within the scope of protection of this application.
Optionally, which is：H bridges topological (as shown in Figure 4), NPC full-bridge topology NPC half-bridge topologies, ANPC
Full-bridge topology, ANPC half-bridge topologies, T-type full-bridge topology, T-type tri-level half-bridge topology, striding capacitance full-bridge topology and mixed type
Any one in five Level Full Bridge topologys；
And the ratio between maxima and minima of itself input terminal voltage of the cascade module 102 control is small under normal running conditions
In equal to 1.2, make its input terminal voltage amplitude fluctuations in smaller range.
In addition, in practical application, filter module 103 can be：In Fig. 1 a to Fig. 2 b and L shown in Fig. 5 a filters mould
LCL filter modules 103 and the high-grade filting not illustrated shown in LC filter modules 103, Fig. 5 c shown in block 103, Fig. 5 b
Any one in module 103；Certainly, the yet topology of its visual concrete application environmental selection other forms, does not do specific herein
It limits, within the scope of protection of this application.
It is worth noting that the DC power supply that each optimizer is connected in above-described embodiment can be at least one light
Volt component (is shown so that DC power supply is a photovoltaic module as an example) in Fig. 1 a to Fig. 2 b；Alternatively, at least one parallel connection
The DC power supply that each optimizer is connected in branch is at least one photovoltaic module, and each excellent at least one parallel branch
It is accumulator to change the DC power supply that device is connected, so that the photovoltaic generating system has DC energy storage function；The parallel branch is
Include the branch of multiple optimizer groups in parallel；It is not specifically limited herein, depending on its concrete application environment, the application's
In protection domain.
Another embodiment of the present invention additionally provides a kind of specific photovoltaic generating system, extremely schemes in above-described embodiment and Fig. 1
On the basis of 5c, referring to Fig. 6 a and Fig. 6 b, further include：At least one header box.
Fig. 6 a are shown for increasing header box on the basis of Fig. 1 a, and the header box is for the optimization to being connected
The output of device group is converged, then the direct current energy after confluence is exported to corresponding high_voltage isolation type DC/DC converters 101.
In Fig. 6 a, the input terminals of each high_voltage isolation type DC/DC converters 101 has been separately connected a header box, and when practical application can
Connect multiple header boxs.
Fig. 6 b are shown for increasing header box on the basis of Fig. 2 a, and the header box is for the optimization to being connected
The output of device group is converged, then the direct current energy after confluence is exported to common DC bus.In Fig. 6 b, each includes multiple
The parallel branch of optimizer group in parallel is connected by a header box with common DC bus respectively.
Remaining principle is same as the previously described embodiments, no longer repeats one by one herein.
Another embodiment of the present invention additionally provides a kind of specific photovoltaic generating system, extremely schemes in above-described embodiment and Fig. 1
On the basis of 6b, further include：System communication module, system detectio module, system accessory power supply and the control of at least one system
Device；
System controller for realizing three circuitry phases cutting-in control；
System detectio module is for realizing the voltage of photovoltaic generating system, electric current, temperature and arc-detection；
System communication module is for realizing system controller and three circuitry phases and extraneous communication；
System accessory power supply is used for as system communication module, system detectio module and system controller power supply.
Preferably, which includes：Main circuit, communication module, detection module, accessory power supply and at least one
Controller；
Controller is used to control the switching tube action in main circuit, realizes MPPT controls；
Detection module is for realizing the voltage of cascade module 102, electric current, temperature and arc-detection；
Communication module is for realizing the communication between controller and system controller；
Accessory power supply is used for as communication module, detection module and controller power supply.
Preferably, high_voltage isolation type DC/DC converters 101 include：Main circuit, communication module, detection module, auxiliary electricity
Source and at least one controller；
Controller is used to detect and export the state of high_voltage isolation type DC/DC converters 101；
Detection module for realizing high_voltage isolation type DC/DC converters 101 voltage, electric current, temperature and arc-detection；
Communication module is connect for realizing controller with system controller or high_voltage isolation type DC/DC converters 101
Cascade module 102 between communication；
Accessory power supply is used for as communication module, detection module and controller power supply.
In specific practical application, system controller, the high_voltage isolation type DC/DC converters of the photovoltaic generating system
The controller of controller and cascade module 102 in 101 all can be multiple, and CPU (Central may be used
Processing Unit, central processing unit), MCU (Microcontroller Unit, micro-control unit), DSP (Digital
Signal Processor, digital signal processor), arm processor, FPGA (Field-Programmable Gate
Array, field programmable gate array), CPLD (Complex Programmable Logic Device, complex programmable logic
Device) and ASIC (Application Specific Intergrated Circuits, application-specific integrated circuit) chip in
Any one is realized, depending on its specific application environment, is not specifically limited herein, in the protection domain of the application
It is interior.
Above-mentioned each communication module, detection module and accessory power supply the equal visual environment of specific implementation form depending on, herein
It is not specifically limited, within the scope of protection of this application.
Remaining principle is same as the previously described embodiments, no longer repeats one by one herein.
Each embodiment is described by the way of progressive in the present invention, the highlights of each of the examples are with other realities
Apply the difference of example, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place is referring to method part illustration
.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications, or is revised as the equivalent embodiment of equivalent variations.Therefore, it is every without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, still fall within technical solution of the present invention protection in the range of.
Claims (10)
1. a kind of photovoltaic generating system, which is characterized in that including at least one optimizer group and three stars or delta connection
Circuitry phase, the circuitry phase includes：Filter module, multiple cascade modules and multiple high_voltage isolation type DC/DC converters；Its
In：
The output end of each cascade module cascades, and cascade one end is connected with the input terminal of the filter module, cascade
An output end of the other end as the circuitry phase；
Another output end of the output end of the filter module as the circuitry phase；
The input terminal of the cascade module is connected with the output end of at least one high_voltage isolation type DC/DC converters；
The input terminal of each high_voltage isolation type DC/DC converters respectively with corresponding at least one optimizer group
Output end be connected；Alternatively, the input terminal of each high_voltage isolation type DC/DC converters is parallel to after common DC bus
It is connected with the output end of at least one optimizer group；
The optimizer group includes at least one optimizer, and the output end series connection of multiple optimizers, concatenated both ends are institute
The output end of optimizer group is stated, the input terminal of the optimizer is connected with DC power supply；
MPPT maximum power point tracking MPPT controls are realized by the optimizer.
2. photovoltaic generating system according to claim 1, which is characterized in that the high_voltage isolation type DC/DC converters
Gain ranging is more than or equal to 1 and is less than 1.5.
3. photovoltaic generating system according to claim 1, which is characterized in that in the high_voltage isolation type DC/DC converters
Main circuit be：LC serial-resonants topology, LLC serial-resonants topology, power bi-directional LC serial-resonants topology, power are double
Any one into LLC serial-resonants topology, double active DC/DC topologys and full-bridge DC/DC topologys；
And the main circuit in the high_voltage isolation type DC/DC converters includes：High frequency transformer.
4. photovoltaic generating system according to claim 1, which is characterized in that the cascade module is：H bridges topology, NPC are complete
Bridge topology, NPC half-bridge topologies, ANPC full-bridge topologies, ANPC half-bridge topologies, T-type full-bridge topology, T-type tri-level half-bridge are topological, winged
Any one in five Level Full Bridge topology of across capacitance full-bridge topology and mixed type；
And the cascade module controls the ratio between maxima and minima of itself input terminal voltage and is less than or equal to 1.2.
5. photovoltaic generating system according to claim 1, which is characterized in that further include：At least one header box, the remittance
Stream case is used to converge to the output of the optimizer group connected, then the direct current energy after confluence is exported to corresponding described
High_voltage isolation type DC/DC converters or the common DC bus.
6. according to any photovoltaic generating systems of claim 1-5, which is characterized in that the direct current that each optimizer is connected
Power supply is at least one photovoltaic module；Alternatively,
The DC power supply that each optimizer is connected at least one parallel branch is at least one photovoltaic module, and at least one
The DC power supply that each optimizer is connected in parallel branch is accumulator；The parallel branch be include multiple optimizers in parallel
The branch of group.
7. according to any photovoltaic generating systems of claim 1-5, which is characterized in that the optimizer is non-isolated
DC/DC converters.
8. according to any photovoltaic generating systems of claim 1-5, which is characterized in that further include：System communication module is
System detection module, system accessory power supply and at least one system controller；
The system controller for realizing three circuitry phases cutting-in control；
The system detectio module is for realizing the voltage of the photovoltaic generating system, electric current, temperature and arc-detection；
The system communication module is for realizing the system controller and three circuitry phases and extraneous communication；
The system accessory power supply is used to supply for the system communication module, the system detectio module and the system controller
Electricity.
9. photovoltaic generating system according to claim 8, which is characterized in that the cascade module includes：Main circuit, communication
Module, detection module, accessory power supply and at least one controller；
The controller is used to control the switching tube action in the main circuit, realizes MPPT controls；
The detection module is for realizing the voltage of the cascade module, electric current, temperature and arc-detection；
The communication module is for realizing the communication between the controller and the system controller；
The accessory power supply is used for as the communication module, the detection module and controller power supply.
10. photovoltaic generating system according to claim 8, which is characterized in that the high_voltage isolation type DC/DC converter packets
It includes：Main circuit, communication module, detection module, accessory power supply and at least one controller；
The controller is used to detect and export the state of the high_voltage isolation type DC/DC converters；
The detection module for realizing the high_voltage isolation type DC/DC converters voltage, electric current, temperature and arc-detection；
The communication module converts for realizing the controller and the system controller or the high_voltage isolation type DC/DC
Communication between the cascade module that device is connected；
The accessory power supply is used for as the communication module, the detection module and controller power supply.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109066721A (en) * | 2018-09-29 | 2018-12-21 | 阳光电源（上海）有限公司 | A kind of photovoltaic generating system and its controller |
| CN110233496A (en) * | 2019-06-05 | 2019-09-13 | 合肥工业大学 | The control method of tandem photovoltaic solid-state transformer under the conditions of unbalanced source voltage |
| CN112217193A (en) * | 2019-07-12 | 2021-01-12 | 阳光电源股份有限公司 | Photovoltaic hydrogen production power station, direct-current coupling photovoltaic off-grid hydrogen production system and control method thereof |
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