CN110535173A - A kind of alternating current-direct current mixing photovoltaic electrification energy storage system - Google Patents
A kind of alternating current-direct current mixing photovoltaic electrification energy storage system Download PDFInfo
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- CN110535173A CN110535173A CN201810516144.0A CN201810516144A CN110535173A CN 110535173 A CN110535173 A CN 110535173A CN 201810516144 A CN201810516144 A CN 201810516144A CN 110535173 A CN110535173 A CN 110535173A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention provides a kind of alternating current-direct current mixing photovoltaic electrification energy storage system, DC grid, and the structure that each energy storage high_voltage isolation type DC/DC converter is in parallel using output series connection input are series-connected to by the energy storage converter that multiple energy storage high_voltage isolation type DC/DC converters are constituted；Framework in this way, so that being adjusted from photovoltaic module side to the path that energy storage device charges are as follows: photovoltaic module generated energy passes through photovoltaic high_voltage isolation type DC/DC converter, then it charges by energy storage high_voltage isolation type DC/DC converter to energy storage device, in total two-stage；And from the path that energy storage device discharges are as follows: energy storage device gives power grid electric discharge by cascade module by energy storage high_voltage isolation type DC/DC converter, then, in total two-stage.Therefore, the energy storage conversion process under this framework is only needed since part is charged and discharged path through level Four, thus overall conversion efficiency gets a promotion compared with prior art.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, in particular to a kind of alternating current-direct current mixing photovoltaic electrification energy storage system.
Background technique
Extensive energy storage has started gradually to be applied to electric system at present, can be used for system frequency modulation and pressure regulation, photovoltaic hair
Electric system power smooth and store photovoltaic generating system daytime energy with realize night generate electricity.However it is handed in existing mesohigh
In direct current mixing photovoltaic generating system technical solution, is perhaps used without energy-storage system or its energy-storage system and be located at mesohigh
The mode of alternating current net side.
For being located at the alternating current-direct current mixing photovoltaic electrification energy storage system of alternating current net side, generally two-level configuration, that is, use
Low pressure energy storage inverter is powered on the framework of power step-up transformer, or adds the frame of isolated DC/DC converter using cascaded H-bridges
Structure.In this kind of system, the path charged from photovoltaic module side are as follows: photovoltaic module generated energy is by direct current to the upper of exchange
2 stage converter is stated, is then charged the battery using the two-level configuration of energy-storage system, in total level Four；It discharges from energy-storage battery
Path are as follows: battery is discharged by the two-level configuration of energy-storage system to power grid, in total two-stage.
Therefore, such system needs to cause overall conversion efficiency too low by six grades since part is charged and discharged path.
Summary of the invention
The present invention provides a kind of alternating current-direct current mixing photovoltaic electrification energy storage system, to solve energy storage transfer efficiency in the prior art
Low problem.
To achieve the above object, technical solution provided by the present application is as follows:
A kind of alternating current-direct current mixing photovoltaic electrification energy storage system, comprising: multiple photovoltaic high_voltage isolation type DC/DC converters, more
A energy storage high_voltage isolation type DC/DC converter, at least one energy storage device, M upper bridge arms, M lower bridge arm, M inductance device
An and filter；Wherein:
One end of each upper bridge arm each by an inductance device and the corresponding lower bridge arm one end
It is connected；
The midpoint of each inductance device passes through the filter respectively and is connected with AC network；
The other end of each upper bridge arm is connected, and tie point is connected with the anode of DC grid；
The other end of each lower bridge arm is connected, and tie point is connected with the cathode of the DC grid；
The upper bridge arm includes N number of by exchanging the concatenated cascade module in side with the lower bridge arm, and N is positive integer；Institute
The DC side for stating cascade module is hanging；
Multiple photovoltaic conversion units pass through output end photovoltaic converter string in series, at least one described photovoltaic converter
Series winding is connected between the positive electrode and negative electrode of the DC grid；The photovoltaic conversion unit include: the photovoltaic high pressure every
Release DC/DC converter, alternatively, the photovoltaic high_voltage isolation type DC/DC converter of at least two output ends parallel connection；
The input terminal of the photovoltaic high_voltage isolation type DC/DC converter is for connecting photovoltaic module；
It include: high frequency transformer in the photovoltaic high_voltage isolation type DC/DC converter, the secondary side of the original of the high frequency transformer
Between isolation voltage grade be more than or equal to 10kV；
Multiple energy storage converter units pass through output end energy storage converter string in series, at least one described energy storage converter
Series winding is connected between the positive electrode and negative electrode of the DC grid；The energy storage converter unit include: the energy storage high pressure every
Release DC/DC converter, alternatively, the energy storage high_voltage isolation type DC/DC converter of at least two output ends parallel connection；
The input terminal of multiple energy storage high_voltage isolation type DC/DC converters is connected in parallel in the energy storage device.
Optionally, the input terminal of each photovoltaic high_voltage isolation type DC/DC converter in the photovoltaic converter string
It is respectively used to connect corresponding photovoltaic module；Alternatively,
The input terminal of each photovoltaic high_voltage isolation type DC/DC converter in the photovoltaic converter string is in parallel, with
Connect identical photovoltaic module；Or
In the photovoltaic converter string, multiple concatenated photovoltaic high_voltage isolation type DC/DC converters of output end it is defeated
Enter end parallel connection, to connect identical photovoltaic module.
Preferably, further includes: multiple optimizer groups；
The input terminal and the output end phase of optimizer group described at least one of the photovoltaic high_voltage isolation type DC/DC converter
Even；
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 at least one photovoltaic module.
Preferably, the optimizer is controlled for realizing the MPPT maximum power point tracking MPPT for the photovoltaic module connected
System.
Preferably, further includes: 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 the corresponding photovoltaic high_voltage isolation type DC/DC converter.
Optionally, the input terminal of each energy storage high_voltage isolation type DC/DC converter in the energy storage converter string
Parallel connection, the both ends after parallel connection are connected with the energy storage device；Alternatively,
In the energy storage converter string, whole energy storage is high in multiple concatenated energy storage converter units of output end
Press the input terminal of isolated form DC/DC converter in parallel, the both ends after parallel connection are connected with the corresponding energy storage device；Or
In the energy storage converter string, the corresponding energy storage high_voltage isolation type DC/ in each energy storage converter unit
The input terminal of DC converter is in parallel, and the both ends after parallel connection are connected with the corresponding energy storage device；Again alternatively,
In the energy storage converter string, the corresponding single storage in multiple concatenated energy storage converter units of output end
The input terminal of energy high_voltage isolation type DC/DC converter is in parallel, and the both ends after parallel connection are connected with the corresponding energy storage device.
Preferably, the main circuit of the cascade module is half-bridge topology or full-bridge topology.
Preferably, the main circuit of the photovoltaic high_voltage isolation type DC/DC converter is LC series resonant topology, LLC series connection
Resonance topological, double active DC/DC topologys, full-bridge DC/DC topology, power bi-directional LC series resonant topology and power bi-directional LLC string
Join any one in resonance topological.
Preferably, the main circuit of the energy storage high_voltage isolation type DC/DC converter is double active DC/DC topologys, power pair
Any one into LC series resonant topology and power bi-directional LLC series resonant topology.
Preferably, the photovoltaic high_voltage isolation type DC/DC converter and the energy storage high_voltage isolation type DC/DC converter
Main circuit is Multiple coil single input and multi-output structure, and each output port obtains the output of corresponding main circuit by series connection
End.
Preferably, the energy storage device are as follows: battery unit, energy accumulation device for fly wheel, water-storage energy storage device and thermal energy storage
It can any one in device；Alternatively,
The energy storage device includes: battery unit and converter, and battery unit is connected with one end of converter, converter
The other end is for connecting the energy storage high_voltage isolation type DC/DC converter.
Alternating current-direct current mixing photovoltaic electrification energy storage system provided by the invention is converted by multiple energy storage high_voltage isolation type DC/DC
The energy storage converter that device is constituted is series-connected to DC grid, and each energy storage high_voltage isolation type DC/DC converter is using output string
Connection input structure in parallel；Framework in this way, so that being adjusted from photovoltaic module side to the path that energy storage device charges
Are as follows: photovoltaic module generated energy passes through photovoltaic high_voltage isolation type DC/DC converter, then passes through energy storage high_voltage isolation type DC/DC
Converter charges to energy storage device, in total two-stage；And from energy storage device discharge path are as follows: energy storage device by energy storage high pressure every
Then release DC/DC converter is discharged by cascade module to power grid, in total two-stage.Therefore, the energy storage conversion under this framework
Process is only needed since part is charged and discharged path through level Four, thus overall conversion efficiency is mentioned compared with prior art
It rises.Also, because the isolation voltage grade between the secondary side of the original of its photovoltaic high_voltage isolation type DC/DC converter medium/high frequency transformer is big
In being equal to 10kV, which is incorporated to the electric energy in the photovoltaic module connected
Mesohigh DC grid, and then electric energy is conveyed with lesser loss.
Detailed description of the invention
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 technical 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
It obtains other drawings based on these drawings.
Fig. 1 a to Fig. 1 d is four of main circuit in alternating current-direct current mixing photovoltaic electrification energy storage system provided in an embodiment of the present invention
Kind structural schematic diagram；
Fig. 2 a to and Fig. 2 b be main circuit in cascade module provided in an embodiment of the present invention two kinds of circuit diagrams；
Fig. 3 a to Fig. 3 d is four kinds of main circuit in photovoltaic high_voltage isolation type DC/DC converter provided in an embodiment of the present invention
Circuit diagram；
Fig. 4 is photovoltaic high_voltage isolation type DC/DC converter and energy storage high_voltage isolation type DC/DC provided in an embodiment of the present invention
The structural schematic diagram of main circuit in converter；
Fig. 5 is a kind of structural schematic diagram of energy storage device provided in an embodiment of the present invention.
Specific embodiment
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 description, 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, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
The present invention provides a kind of alternating current-direct current mixing photovoltaic electrification energy storage system, to solve energy storage transfer efficiency in the prior art
Low problem.
Referring to Fig. 1 a to Fig. 1 d, the alternating current-direct current mixing photovoltaic electrification energy storage system, comprising: multiple photovoltaic high_voltage isolation types
DC/DC converter 101, multiple energy storage high_voltage isolation type DC/DC converters 102, at least one energy storage device, M upper bridge arms
201, M lower bridge arm 202, M inductance device 103 and a filter 104, the value of M can regard its specific application environment and
It is fixed, such as any one value (Fig. 1 a to Fig. 1 d is shown by taking M=3 as an example) in 2 to 6, herein without limitation, in the application
Protection scope in；Wherein:
One end of each upper bridge arm 201 each by an inductance device 103 and corresponding lower bridge arm 202 one end phase
Even；
The midpoint of each inductance device 103 passes through filter 104 respectively and is connected with AC network；
The other end of each upper bridge arm 201 is connected, and tie point is connected with the anode of DC grid；
The other end of each lower bridge arm 202 is connected, and tie point is connected with the cathode of DC grid；
For upper bridge arm 201 with lower bridge arm 202 including N number of by exchanging the concatenated cascade module in side, N is positive integer；Cascade
The DC side of module is hanging；Ac bus is respectively constituted by the cascade module of modular multilevel in grid side and high voltage direct current is female
Line, so that whole system can connect AC network and DC grid simultaneously.
Meanwhile multiple photovoltaic conversion units pass through output end photovoltaic converter string in series, at least one photovoltaic conversion
Device series winding is connected between the positive electrode and negative electrode of DC grid；The photovoltaic conversion unit includes: a photovoltaic high_voltage isolation type DC/DC
Converter 101, alternatively, the photovoltaic high_voltage isolation type DC/DC converter 101 of at least two output ends parallel connection；
The input terminal of photovoltaic high_voltage isolation type DC/DC converter 101 is for connecting photovoltaic module；
Multiple energy storage converter units pass through output end energy storage converter string in series, at least one energy storage converter series winding
It is connected between the positive electrode and negative electrode of DC grid；The energy storage converter unit includes: an energy storage high_voltage isolation type DC/DC converter
102, alternatively, the energy storage high_voltage isolation type DC/DC converter 102 of at least two output ends parallel connection；
The input terminal of multiple energy storage high_voltage isolation type DC/DC converters 102 is connected in parallel in an energy storage device.
For the input terminal of each energy storage high_voltage isolation type DC/DC converter 102 in energy storage converter string, can be complete
The input terminal of portion's energy storage high_voltage isolation type DC/DC converter 102 is connected in parallel to the same energy storage device (referring to Fig. 1 a)；It is also possible to
The input terminal of whole energy storage high_voltage isolation type DC/DC converters 102 is simultaneously in a part of concatenated energy storage converter unit of output end
It is coupled to the same energy storage device, whole energy storage high_voltage isolation type DC/ in the concatenated energy storage converter unit of another part output end
The input terminal of DC converter 102 is connected in parallel to another energy storage device (referring to Fig. 1 b), naturally it is also possible to be the same energy storage transformation
Device string is divided into multiple portions, is connected respectively from different energy storage devices, and it is single that the energy storage transformation connected is done for each energy storage device
The number of member is not specifically limited herein；Or it can be each energy storage high_voltage isolation type in each energy storage converter unit
The input terminal of DC/DC converter 102 is defeated with energy storage high_voltage isolation type DC/DC converter 102 corresponding in other energy-storage units
Enter end and be connected in parallel to the same energy storage device (referring to Fig. 1 c)；It can also be and an energy storage converter string is divided into multiple portions, In
Each partial interior, the input terminal difference of each energy storage high_voltage isolation type DC/DC converter 102 in each energy storage converter unit
The input terminal of single energy storage high_voltage isolation type DC/DC converter 102 corresponding with other energy-storage units is connected in parallel to the same storage
It can device；It is not specifically limited herein, depending on its specific application environment, within the scope of protection of this application.
Alternating current-direct current mixing photovoltaic electrification energy storage system provided in this embodiment, by multiple energy storage high_voltage isolation type DC/DC
The energy storage converter that converter 102 is constituted is series-connected to DC grid, and each energy storage high_voltage isolation type DC/DC converter 102
It is connected using output and inputs structure in parallel, framework in this way, so that charging from photovoltaic module side to energy storage device
Path adjustment are as follows: photovoltaic module generated energy passes through photovoltaic high_voltage isolation type DC/DC converter 101, then high by energy storage
Isolated form DC/DC converter 102 is pressed to charge to energy storage device, in total two-stage；And from energy storage device discharge path are as follows: energy storage dress
It sets through energy storage high_voltage isolation type DC/DC converter 102, is then discharged by cascade module to power grid, in total two-stage.Therefore,
Energy storage conversion process under this framework is only needed since part is charged and discharged path through level Four, thus overall conversion efficiency
It gets a promotion compared with prior art.
It is worth noting that with the development of technology, following electric system will be comprising DC grid and AC network simultaneously
The case where depositing, this also means that following photovoltaic generating system may need to connect AC network and DC grid simultaneously；It is many
Well known, compared to mesohigh AC network, mesohigh DC grid can convey electric energy with lesser loss, more suitable for
Long distance delivery electric energy.Therefore, in field of new energy generation, future will more and more using mesohigh DC grid and/
Or mesohigh alternating current-direct current mixing power grid carries out electric energy transmission；However scheme in the prior art is typically only capable to enough connection AC networks
One of with low-voltage direct power grid.
And the alternating current-direct current mixing photovoltaic electrification energy storage system provided in this embodiment, on the one hand by the grade of modular multilevel
Gang mould block uses above-mentioned connection type, so that entire photovoltaic generating system can connect AC network and DC grid simultaneously；It is another
Aspect, includes: high frequency transformer in the high_voltage isolation type DC/DC converter 101 in the present embodiment, and the original of the high frequency transformer
Isolation voltage grade between secondary side is more than or equal to 10kV, which will be connected
The electric energy in photovoltaic module connect is incorporated to mesohigh power grid；Voltage class between its former secondary side can be according to specifically using ring
Border is set, to adapt to different photovoltaic system applications；It is not specifically limited herein, within the scope of protection of this application.
In addition, in above-described embodiment, for each photovoltaic high_voltage isolation type DC/DC converter in photovoltaic converter string
101 input terminal may be respectively used for connecting corresponding photovoltaic module (as shown in Fig. 1 a to Fig. 1 d)；Alternatively, can also be with
It is the input terminal parallel connection of each photovoltaic high_voltage isolation type DC/DC converter 101 in photovoltaic converter string, to connect identical light
It lies prostrate component (not illustrated)；Or it can also be in photovoltaic converter string, a part of concatenated photovoltaic high pressure of output end
The input terminal of isolated form DC/DC converter 101 is in parallel, to connect identical photovoltaic module, the concatenated light of another part output end
Lie prostrate the input terminal parallel connection of high_voltage isolation type DC/DC converter 101, to connect in addition identical photovoltaic module (not illustrated)；
It is not specifically limited herein, depending on its specific application environment, within the scope of protection of this application.
Herein on basis, it is preferred that the alternating current-direct current mixing photovoltaic electrification energy storage system further include: multiple optimizer groups；
The input terminal of photovoltaic high_voltage isolation type DC/DC converter 101 is connected with the output end of at least one optimizer group；
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 at least one photovoltaic module.
For the input terminal of each photovoltaic high_voltage isolation type DC/DC converter 101 in photovoltaic converter string, can be point
It is not connected with the output end of at least one optimizer group；The each photovoltaic high_voltage isolation type being also possible in photovoltaic converter string
The input terminal of DC/DC converter 101 is in parallel, and the both ends after parallel connection are connected with the output end of at least one optimizer group；Or
It can also be that the input terminal of multiple photovoltaic high_voltage isolation type DC/DC converters 101 in photovoltaic converter string is in parallel, after in parallel
Both ends are connected with the output end of at least one optimizer group；It is not specifically limited, depending on its specific application environment, exists herein
In the protection scope of the application.
Optionally, optimizer is non-isolated DC/DC converter.
Preferably, optimizer is for realizing MPPT (the Maximum Power Point for the DC power supply connected
Tracking, MPPT maximum power point tracking) control.
Preferably, which can also include: at least one header box, and header box is used
Converge in the output to the optimizer group connected, then by the direct current energy after confluence export to corresponding photovoltaic high pressure every
Release DC/DC converter 101.
In specific actual design process, since the MPPT control function of DC/DC converter will be belonged in the prior art
Corresponding optimizer is transferred to, so that photovoltaic high_voltage isolation type DC/DC converter 101 is no longer needed to the photovoltaic module connected
Carry out MPPT control and real-time pressure regulation, make its gain ranging, i.e., output voltage with input voltage ratio gain maximum divided by
The quotient that output voltage is obtained with the gain minimum value of input voltage ratio, what can be designed is smaller, and then makes photovoltaic high_voltage isolation
The efficiency of type DC/DC converter 101 is further promoted compared with prior art, to improve system effectiveness, peak efficiency will
Greater than 98.5%；In addition it is possible to reduce the pressure of 101 medium/high frequency transformer of photovoltaic high_voltage isolation type DC/DC converter.
Specifically, the gain model of photovoltaic high_voltage isolation type DC/DC converter 101 can be made due to the use of optimizer
It encloses more than or equal to 1 and less than 1.5, for example is designed at 1.5 times or less, it might even be possible to by photovoltaic high_voltage isolation type DC/DC
Converter 101 is designed to fixed gain, makees opened loop control, therefore simplifies the control of photovoltaic high_voltage isolation type DC/DC converter 101
Function processed reduces the design difficulty of photovoltaic high_voltage isolation type DC/DC converter 101.Meanwhile the application of optimizer also solves
An original DC bus corresponds to single MPPT and controls the series-parallel mismatch problems of existing component, realizes component level MPPT control
System, improves system generated energy, can also accomplish to be monitored each photovoltaic module.And whole system scheme is compared to conventional
System improving power density.
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 alternating current-direct current mixing photovoltaic electrification energy storage system, in above-mentioned reality
On the basis for applying example and Fig. 1 a to Fig. 1 d:
Optionally, the main circuit of cascade module is half-bridge topology (as shown in Figure 2 a) or full-bridge topology (such as Fig. 2 b institute
Show).
Optionally, the main circuit of photovoltaic high_voltage isolation type DC/DC converter 101 is LC series resonant topology (such as Fig. 3 a institute
Show), LLC series resonant topology (as shown in Figure 3b), double active DC/DC topological (as shown in Figure 3c), full-bridge DC/DC it is topological (such as
Shown in Fig. 3 d), any one in power bi-directional LC series resonant topology and power bi-directional LLC series resonant topology；And Fig. 3 a
It is only a kind of example of two level topology to Fig. 3 d, it's not limited to that, in practical application, LC series resonant topology, LLC series connection
Resonance topological and double active DC/DC topologys can also be three-level topology, and certainly, also its visual specific application environment selects other
The topology of form, is not specifically limited herein, within the scope of protection of this application.
Optionally, the main circuit of energy storage high_voltage isolation type DC/DC converter 102 is double active DC/DC topologys (such as Fig. 3 c institute
Show), any one in power bi-directional LC series resonant topology and power bi-directional LLC series resonant topology；Certainly, also it is visual its
Specific application environment selects the topology of other forms, is not specifically limited herein, within the scope of protection of this application.
Preferably, the master of photovoltaic high_voltage isolation type DC/DC converter 101 and energy storage high_voltage isolation type DC/DC converter 102
Circuit is Multiple coil single input and multi-output structure, i.e. a DC/AC module is connected with primary side winding, multiple AC/DC modules are divided
It is not connected with each vice-side winding, and each output port (i.e. the output end of AC/DC module) obtains corresponding main electricity by series connection
The output end on road, as shown in Figure 4.
In practical application, which should also include: system communication module, system inspection
Survey module, system accessory power supply and at least one system controller；
System controller is for realizing the cutting-in control for each cascade module；
System detection module for realizing alternating current-direct current mixing photovoltaic electrification energy storage system voltage, electric current, temperature and electric arc
Detection；
System communication module is for realizing system controller and other controllers and extraneous communication；
System accessory power supply is used for as system communication module, system detection module and system controller power supply.
Preferably, which includes: main circuit, communication module, detection module, accessory power supply and at least one control
Device；
The controller is used to control the switching tube action in its main circuit；
Detection module is for realizing the voltage of cascade module, 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, photovoltaic high_voltage isolation type DC/DC converter 101 include: main circuit, it is communication module, detection module, auxiliary
Help power supply and at least one controller；
Controller is used to detect and export the state of photovoltaic high_voltage isolation type DC/DC converter 101；
Detection module is for realizing the inspection of the voltage of photovoltaic high_voltage isolation type DC/DC converter 101, electric current, temperature and electric arc
It surveys；
Communication module is for realizing the communication between controller and system controller or cascade module；
Accessory power supply is used for as communication module, detection module and controller power supply.
Preferably, energy storage high_voltage isolation type DC/DC converter 102 include: main circuit, it is communication module, detection module, auxiliary
Help power supply and at least one controller；
Controller is used to detect and export the state of energy storage high_voltage isolation type DC/DC converter 102；
Detection module is for realizing the inspection of the voltage of energy storage high_voltage isolation type DC/DC converter 102, electric current, temperature and electric arc
It surveys；
Communication module is for realizing the communication between controller and system controller or cascade module；
Accessory power supply is used for as communication module, detection module and controller power supply.
In specific practical application, the system controller of the alternating current-direct current mixing photovoltaic electrification energy storage system, photovoltaic high pressure
The controller and grade gang mould in controller, energy storage high_voltage isolation type DC/DC converter 102 in isolated form DC/DC converter 101
The controller of block all can be multiple, and can using CPU (Central Processing Unit, central processing unit),
MCU (Microcontroller Unit, micro-control unit), DSP (Digital Signal Processor, at digital signal
Manage device), arm processor, FPGA (Field-Programmable Gate Array, field programmable gate array), CPLD
(Complex Programmable Logic Device, Complex Programmable Logic Devices) and ASIC (Application
Specific Intergrated Circuits, specific integrated circuit) any one in chip realize, it is depending on it specific
It depending on application environment, is not specifically limited herein, within the scope of protection of this application.
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.
Optionally, energy storage device are as follows: battery unit, energy accumulation device for fly wheel, water-storage energy storage device and thermal energy energy storage dress
Any one in setting；Alternatively,
The energy storage device includes: battery unit and converter, and battery unit is connected with one end of converter, converter it is another
One end is for connecting energy storage high_voltage isolation type DC/DC converter 102, referring to Fig. 5.
Optionally, inductance device 103 includes concatenated two identical inductances, and concatenated tie point is inductance device 103
Midpoint；
Alternatively, inductance device 103 is one with tapped inductance, mid-point tap is the midpoint of inductance device 103.
In addition, in practical application, filter 104 can be with are as follows: L filter, LC filter, LCL filter and high-order filter
Any one in wave device；Certainly, the yet topology of visual its specific application environment selection other forms, does not do specific limit herein
It is fixed, 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 in a progressive manner in the present invention, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively 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 equivalent example modified to equivalent change.Therefore, it is all 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, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (11)
1. a kind of alternating current-direct current mixing photovoltaic electrification energy storage system characterized by comprising multiple photovoltaic high_voltage isolation type DC/DC
Converter, multiple energy storage high_voltage isolation type DC/DC converters, at least one energy storage device, M upper bridge arms, M lower bridge arm, M
Inductance device and a filter；Wherein:
One end of each upper bridge arm is connected each by an inductance device with one end of the corresponding lower bridge arm；
The midpoint of each inductance device passes through the filter respectively and is connected with AC network；
The other end of each upper bridge arm is connected, and tie point is connected with the anode of DC grid；
The other end of each lower bridge arm is connected, and tie point is connected with the cathode of the DC grid；
The upper bridge arm includes N number of by exchanging the concatenated cascade module in side with the lower bridge arm, and N is positive integer；The grade
The DC side of gang mould block is hanging；
Multiple photovoltaic conversion units pass through output end photovoltaic converter string in series, at least one described photovoltaic converter series winding
It is connected between the positive electrode and negative electrode of the DC grid；The photovoltaic conversion unit includes: the photovoltaic high_voltage isolation type
DC/DC converter, alternatively, the photovoltaic high_voltage isolation type DC/DC converter of at least two output ends parallel connection；
The input terminal of the photovoltaic high_voltage isolation type DC/DC converter is for connecting photovoltaic module；
It include: high frequency transformer in the photovoltaic high_voltage isolation type DC/DC converter, between the secondary side of the original of the high frequency transformer
Isolation voltage grade be more than or equal to 10kV；
Multiple energy storage converter units pass through output end energy storage converter string in series, at least one described energy storage converter series winding
It is connected between the positive electrode and negative electrode of the DC grid；The energy storage converter unit includes: the energy storage high_voltage isolation type
DC/DC converter, alternatively, the energy storage high_voltage isolation type DC/DC converter of at least two output ends parallel connection；
The input terminal of multiple energy storage high_voltage isolation type DC/DC converters is connected in parallel in the energy storage device.
2. alternating current-direct current mixing photovoltaic electrification energy storage system according to claim 1, which is characterized in that the photovoltaic converter
The input terminal of each photovoltaic high_voltage isolation type DC/DC converter in string is respectively used to connect corresponding photovoltaic group
Part；Alternatively,
The input terminal of each photovoltaic high_voltage isolation type DC/DC converter in the photovoltaic converter string is in parallel, with connection
Identical photovoltaic module；Or
In the photovoltaic converter string, the input terminal of multiple concatenated photovoltaic high_voltage isolation type DC/DC converters of output end
It is in parallel, to connect identical photovoltaic module.
3. alternating current-direct current mixing photovoltaic electrification energy storage system according to claim 2, which is characterized in that further include: Duo Geyou
Change device group；
The input terminal of the photovoltaic high_voltage isolation type DC/DC converter is connected with the output end of optimizer group described at least one；
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 at least one photovoltaic module.
4. alternating current-direct current mixing photovoltaic electrification energy storage system according to claim 3, which is characterized in that the optimizer is used for
It realizes and the MPPT maximum power point tracking MPPT of the photovoltaic module connected is controlled.
5. alternating current-direct current mixing photovoltaic electrification energy storage system according to claim 3, which is characterized in that further include: at least one
A header box, the header box is for converging to the output of the optimizer group connected, then by the direct current energy after confluence
It exports to the corresponding photovoltaic high_voltage isolation type DC/DC converter.
6. alternating current-direct current mixing photovoltaic electrification energy storage system according to claim 1, which is characterized in that the energy storage converter
The input terminal of each energy storage high_voltage isolation type DC/DC converter in string is in parallel, and the both ends and the energy storage after parallel connection fill
It sets connected；Alternatively,
In the energy storage converter string, in multiple concatenated energy storage converter units of output end whole energy storage high pressures every
The input terminal of release DC/DC converter is in parallel, and the both ends after parallel connection are connected with the corresponding energy storage device；Or
In the energy storage converter string, the corresponding energy storage high_voltage isolation type DC/DC becomes in each energy storage converter unit
The input terminal of parallel operation is in parallel, and the both ends after parallel connection are connected with the corresponding energy storage device；Again alternatively,
In the energy storage converter string, the corresponding single energy storage is high in multiple concatenated energy storage converter units of output end
Press the input terminal of isolated form DC/DC converter in parallel, the both ends after parallel connection are connected with the corresponding energy storage device.
7. -6 any alternating current-direct current mixing photovoltaic electrification energy storage system according to claim 1, which is characterized in that the cascade
The main circuit of module is half-bridge topology or full-bridge topology.
8. -6 any alternating current-direct current mixing photovoltaic electrification energy storage system according to claim 1, which is characterized in that the photovoltaic
The main circuit of high_voltage isolation type DC/DC converter is LC series resonant topology, LLC series resonant topology, double active DC/DC are opened up
It flutters, any one in full-bridge DC/DC topology, power bi-directional LC series resonant topology and power bi-directional LLC series resonant topology.
9. -6 any alternating current-direct current mixing photovoltaic electrification energy storage system according to claim 1, which is characterized in that the energy storage
The main circuit of high_voltage isolation type DC/DC converter is that double active DC/DC topologys, power bi-directional LC series resonant topology and power are double
Any one into LLC series resonant topology.
10. -6 any alternating current-direct current mixing photovoltaic electrification energy storage system according to claim 1, which is characterized in that the light
The main circuit for lying prostrate high_voltage isolation type DC/DC converter and the energy storage high_voltage isolation type DC/DC converter is that Multiple coil list is defeated
Enter multi output structure, and each output port obtains the output end of corresponding main circuit by series connection.
11. -6 any alternating current-direct current mixing photovoltaic electrification energy storage system according to claim 1, which is characterized in that the storage
It can device are as follows: any one in battery unit, energy accumulation device for fly wheel, water-storage energy storage device and thermal energy energy storage device；Or
Person,
The energy storage device includes: battery unit and converter, and battery unit is connected with one end of converter, converter it is another
End is for connecting the energy storage high_voltage isolation type DC/DC converter.
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