CN206060577U - A kind of multichannel MPPT Miniature inverter - Google Patents
A kind of multichannel MPPT Miniature inverter Download PDFInfo
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- CN206060577U CN206060577U CN201621078113.4U CN201621078113U CN206060577U CN 206060577 U CN206060577 U CN 206060577U CN 201621078113 U CN201621078113 U CN 201621078113U CN 206060577 U CN206060577 U CN 206060577U
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
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- H02J3/385—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
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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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- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Inverter Devices (AREA)
- Control Of Electrical Variables (AREA)
- Photovoltaic Devices (AREA)
Abstract
The utility model discloses a kind of multichannel MPPT Miniature inverter, including multichannel DC/DC modular converter, multichannel voltage changing module, DC/AC inversion modules and EMC filtration modules, wherein being connected with voltage changing module all the way per road DC/DC modular converters；The multichannel voltage changing module is connected with DC/AC inversion modules；The DC/AC inversion modules are connected with EMC filtration modules；Every road DC/DC modular converters, for obtaining power output of every road under maximum power point；Every road voltage changing module is for the boost in voltage in the power output on the obtained every road of DC/DC modular converters to connecting, and collects to a general power output；The DC/AC inversion modules, for by general power output inversion for exchange；The EMC filtration modules, for being connected to the grid after carrying out EMC filtering to exchange obtained by DC/AC inversion modules.This utility model can effectively track multichannel each maximum power point in real time, eliminate and cause the excessive defect of Converting Unit branch road because being input into multichannel, reduce product cost, improve overall efficiency.
Description
Technical field
This utility model is related to a kind of multichannel MPPT Miniature inverter, belongs to the technical field of inverter.
Background technology
Solar energy will become the optimal energy for supporting following global economy to increase as the regenerative resource for most cleaning.The whole world
Photovoltaic power generation quantity is increased with annual up to 46.7% ratio.45GW is up to 2010 end of the year total installations of generating capacity.With global coal
The exhaustion of the resources such as charcoal/oil and the national governments' propulsion photovoltaic that accelerates of nuclear power station risk send out the paces applied.It is estimated
The year two thousand twenty global solar total installation of generating capacity will be up to 980GW, and Chinese total installation of generating capacity will be more than 20GW.
But the cost of photovoltaic plant is still above the cost in other forms power station at present, multinational government has to by complement
To promote theCourse of PV Industry.Therefore improve the conversion efficiency of photovoltaic plant, employing new technology is greatly reduced photovoltaic plant synthesis
Cost is to eventually prompt photovoltaic generation into business-like unique channel.
Miniature inverter can improve the generating efficiency of solar power station more than 20%.Although it can greatly improve too
The generating efficiency in positive energy power station, but the cost of Miniature inverter in the market is too high.With traditional small-sized inverter phase
Than the cost of Miniature inverter wants high more than 3 times, and thus it greatly increases the cost of building a station of solar power station.So up till now
Till, the technology of Miniature inverter is also difficult to be promoted.
One grid-connected photovoltaic system mainly constitutes i.e. solar module by two parts and solar control is inverse
Become device and grid-connection device.As shown in Figure 1.
The topmost parameter of one grid-connected photovoltaic system of evaluation is exactly photoelectric transformation efficiency.Due to semiconductor light battery
Characteristic its conversion efficiency often all than relatively low.Consider further that the impact of use environment and weather so that we generally make at present
Power conversion efficiency (pce) is 10～15% or so.
One efficient and photovoltaic cell can be made to play maximum from the inverter of motion tracking maximum power of photovoltaic cell
Effectiveness.Inverter has two basic functions：On the one hand it is the electrical network that is galvanically connected to complete DC/AC conversions, on the other hand
It is the efficiency for finding out optimal operating point to optimize solar energy photovoltaic system.For specific solar radiation, temperature and battery
Type, solar energy photovoltaic system all should mutually have unique optimum voltage and electric current, so that photovoltaic system produces maximum energy.
If photovoltaic system is run under non-optimal voltage and levels of current, the efficiency of system is just very low, wastes the collection sun
The good opportunity of energy.
But traditional solar energy photovoltaic system is all made up of many closely coupled solar panels.These batteries
Plate is first grouped series connection, then different series batteries is together in parallel to form array.Produced by solar panel array
Unidirectional current can flow the inverter by the cell panel side.Any one battery in the battery component of such series/parallel
Plate breaks down and may result in whole set of cells failure.Additionally, when there is the masking set of cells such as local shades or debris, this feelings
Condition can also occur.
In order to solve the above problems, current solar panel is all integrated with bypass diode, so that electric current can be around
Cross shielded dead battery plate portion part.After starting diode, electric current can be re-routed by they, that is, changing its course bypasses dead battery
On string.So, the power supply potential of the cell panel that is masked not only is wasted, and the total voltage of whole set of cells can be reduced.
Based on the principle for choosing cell panel optimal point of operation, it is the voltage that optimize impacted battery strings that inverter has to decide on, also
It is to optimize other not having the energy produced by impacted set of cells.At most of conditions, inverter can all select optimization
Do not have influential set of cells, and correspondingly reduce the energy produced by impacted set of cells, even completely close impacted electricity
Pond group.As long as caused by as a result, solar energy photovoltaic system occur 10% masking, will make solar electrical energy generation amount decline one
Half.
Further, in order to obtain higher DC-AC inversion efficiency, traditional combining inverter has to reduce input
It is cost that direct current adaptation accesses admissible voltage fluctuation scope, is abandoned to the direct current input of transfiniting caused by because of illumination variation（Voltage is low
In or be higher than allowable fluctuation range）Inversion, such scheme further " has abandoned " about 10-30% or so, and this is utilizable
Effective photovoltaic resources.
To solve the above problems, a kind of Miniature inverter technology is developed.Miniature inverter technology i.e. per block too
Positive energy cell panel (component）On all install Miniature inverter additional so that system is adapted to the load being continually changing and weather condition, from
And can be that monoblock battery plate and whole system provide optimal conversion efficiency.Miniature inverter framework can also simplify wiring, this
Mean lower installation cost.
But, the key factor for affecting photovoltaic system is reliability, cost and efficiency.Current Miniature inverter technology is very
Hardly possible comprehensively balances these key factors.As the stingy quarter to volume and cost requires, many complicated inversion counting circuits
Just cannot realize in Miniature inverter, therefore the conversion efficiency of current Miniature inverter will be significantly less than traditional inversion
Device.Inverter is the minimum component of reliability in existing photovoltaic system again simultaneously, and they can only typically use 10 years or so,
And cell panel can then ensure using 25 years.Current Miniature inverter Technology Integration will be reduced photovoltaic group to photovoltaic module plate
The life-span of part.
Although in addition, also exist a Miniature inverter only control one piece of battery component, required for an inverter
Function such as MPPT, DC/DC and AC/DC conversion all have to possess, as shown in Fig. 2 a MPPT controller needs connection many
Individual photovoltaic cell component, therefore the cost of current Miniature inverter is much higher than concentration inverter.
And, for a multichannel MPPT inverter, the performance of its every piece of solar panel to be controlled is
Different, i.e., their maximum power point is different, and the drift of the maximum power point of every piece of cell panel is also impossible to
It is synchronous.If in real time and the working condition of each MPPT can not be accurately controlled, the output voltage of each MPPT will be because of difference
And directly cannot conflux, as shown in Figure 3.If using non-immediate scheme of confluxing, then not only the cost of inverter can increase and
And due to having more one-level DC converting, its conversion efficiency can also be reduced.Therefore how in real time, it is accurately controlled and coordinates several roads
MPPT controls are that multichannel MPPT Miniature inverter is successfully crucial.
Therefore, current Miniature inverter is present because solar panel performance is different, the polylith sun that illumination difference is caused
Can cell panel maximum power point it is different, and cause effectively to track in real time the problem of the respective maximum power point of multichannel, and often
Block photovoltaic battery panel individually connects Miniature inverter, causes volume and cost to increase problem.The serious restriction of the above factor
The popularization and application of Miniature inverter.
The content of the invention
Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, there is provided a kind of multichannel MPPT is micro-
Type inverter, solves Miniature inverter because solar panel performance is different, the polylith solar panel that illumination difference is caused
Maximum power point is different, and causes effectively to track in real time the problem of the respective maximum power point of multichannel.
This utility model specifically employs the following technical solutions solution above-mentioned technical problem：
A kind of multichannel MPPT Miniature inverter, including multichannel DC/DC modular converter, multichannel voltage changing module, DC/AC inversion moulds
Block and EMC filtration modules, wherein being connected with voltage changing module all the way per road DC/DC modular converters；The multichannel voltage changing module is equal
It is connected with DC/AC inversion modules；The DC/AC inversion modules are connected with EMC filtration modules；It is described to change per road DC/DC
Module, carries out power draw and MPPT maximum power point tracking for the direct current photovoltaic module to being connected, and obtains per road in maximum work
Power output under rate point；The multichannel voltage changing module, wherein per road voltage changing module for the DC/DC modular converters institute to connecting
The boost in voltage in the power output per road is obtained, and boosting Hou Mei roads power output is collected defeated to a general power
Go out；The DC/AC inversion modules, for by the general power output inversion of gained for exchange；The EMC filtration modules, for right
Exchange obtained by DC/AC inversion modules is connected to the grid after carrying out EMC filtering.
Further, as a kind of optimal technical scheme of the present utility model：Described each DC/DC modular converter also includes
Current foldback circuit.
Further, as a kind of optimal technical scheme of the present utility model：Described each DC/DC modular converter includes 4
In individual prime metal-oxide-semiconductor, and 4 prime metal-oxide-semiconductors, connection forms phase whole-bridging circuit respectively two-by-two.
Further, as a kind of optimal technical scheme of the present utility model：Described each multichannel voltage changing module is using change
Depressor.
Further, as a kind of optimal technical scheme of the present utility model：The DC/AC inversion modules include connecting successively
Rectification circuit, LC filter circuits and the rear class mos circuit for connecing.
Further, as a kind of optimal technical scheme of the present utility model：The rectification circuit is by four diode groups
Into in four diodes, connection forms rectifier bridge respectively two-by-two.
Further, as a kind of optimal technical scheme of the present utility model：The LC filter circuits include inductance, and with
The electric capacity of inductance connection.
Further, as a kind of optimal technical scheme of the present utility model：The rear class mos circuit includes 4 rear classes
Metal-oxide-semiconductor, in 4 rear class metal-oxide-semiconductors, connection forms parallel network circuit respectively two-by-two.
This utility model adopts above-mentioned technical proposal, can produce following technique effect：
（1）The multichannel MPPT Miniature inverter that this utility model is provided, using the output of the multichannel MPPT function of parallel-serial
The method confluxed, input adopt parallel way, it is ensured that each road direct current input module independent trails maximum power point, by respective
DC/DC modular converters and transformer primary side it is in parallel, the structure of secondary series connection makes each road direct current input module originally in parallel
Energy centralization carries out the inversion grid connection of DC/AC inversion modules in a bit.Solve and cause because certain block solar panel is abnormal
Overall non-serviceable problem, and effectively solve because solar panel performance is different, the polylith that illumination difference is caused is too
It is positive can cell panel maximum power point it is different, and cause effectively to track in real time the problem of the respective maximum power point of multichannel, with
And effectively solve merely using multiple independent Miniature inverters, the defect of multiple DC/AC parts is caused, DC/ is reduced
While AC components and parts costs, grid-connected required total current independence distributed to respective solaode further through transformator
Plate.
（2）This utility model can also can effectively solve the problem that the great number of issues that current Miniature inverter faces：Solve because
Every piece of photovoltaic battery panel individually connects Miniature inverter, causes the problem that volume and cost increase；Solve current multichannel MPPT
Inverter is different because of solar panel performance, and that what is caused in real time and can not be accurately controlled asking for each MPPT working condition
Topic.
Therefore, this utility model can not only significantly improve solar cell power generation efficiency, great reduces cost, and raising can
By property, and cause energy centralization per road direct current input module in same point, it is ensured that DC/AC inversion grid connection reliabilities it is same
When, eliminate and the excessive defect of Converting Unit branch road is caused because being input into multichannel, reduce product cost, improve overall efficiency.
Description of the drawings
Fig. 1 is typical photovoltaic system module diagram in prior art.
Fig. 2 is the Miniature inverter module diagram in prior art using single channel MPPT.
Fig. 3 is the Miniature inverter module diagram in prior art using multichannel MPPT.
The circuit structure diagram of the Miniature inverter that Fig. 4 is provided for this utility model.
Fig. 5 is the circuit structure diagram of overcurrent protection in this utility model.
Specific embodiment
Embodiment of the present utility model is described with reference to Figure of description.
This utility model devises a kind of multichannel MPPT Miniature inverter, including multichannel DC/DC modular converter, multichannel transformation
Module, DC/AC inversion modules and EMC filtration modules, wherein being connected with voltage changing module all the way per road DC/DC modular converters；Institute
State multichannel voltage changing module to be connected with DC/AC inversion modules；The DC/AC inversion modules are connected with EMC filtration modules, institute
State EMC filtration modules and be connected to electrical network；Every road DC/DC modular converters, are carried out for the direct current photovoltaic module to being connected
Power draw and MPPT maximum power point tracking, obtain per power output of the road under maximum power point；The multichannel voltage changing module, its
Zhong Mei roads voltage changing module for connect the obtained every road of DC/DC modular converters power output in boost in voltage, and
Boosting Hou Mei roads power output is collected to a general power output；The DC/AC inversion modules, for by the total work of gained
Rate output inversion is exchange；The EMC filtration modules, for being incorporated to after carrying out EMC filtering to exchange obtained by DC/AC inversion modules
Electrical network.
This utility model provides a specific embodiment, the circuit structure of inverter in the embodiment, as shown in figure 4,
The inverter includes 4 road DC/DC modular converters, 4 road voltage changing modules, 1 DC/AC inversion module and 1 EMC filtration module, but
In this utility model, the quantity of each module is not limited to the embodiment, can arrange according to demand, and this utility model is not carried out to which
Limit.Wherein, 4 road voltage changing modules are respectively transformator Tx1, Tx2, Tx3, Tx4；Each DC/DC modular converter includes input
With two outfans m, n, and phase whole-bridging circuits are formed using 4 prime metal-oxide-semiconductors, using dividing in 4 prime metal-oxide-semiconductors two-by-two
Phase whole-bridging circuit Lian Jie not be formed, to realize MPPT functions.The input connection direct current photovoltaic of first DC/DC modular converter
Module, in the present embodiment, direct current photovoltaic module adopts solar panel, the input connection of first DC/DC modular converter the
One solar panel, and corresponding transformator Tx1 is respectively connecting to by two outfans m1, n1 after shifted full-bridge circuit
Former limit；Likewise, the input of second DC/DC modular converter connects the second solar panel, and shifted full-bridge electricity
Road circuit latter two outfan m2, n2 are respectively connecting to the former limit of corresponding transformator Tx2；3rd DC/DC modular converter
Input connect the 3rd solar panel, and shifted full-bridge circuit latter two outfan m3, n3 be respectively connecting to it is corresponding
Become the former limit of swager Tx3；Until the input of the 4th DC/DC modular converter connects the 4th solar panel, and Jing is moved
Phase full-bridge circuit circuit latter two outfan m4, n4 are respectively connecting to the former limit of corresponding transformator Tx4.To realize using described
Each DC/DC modular converter carries out power draw and MPPT maximum power point tracking to each solar panel, obtains per road most
Power output under high-power point.
On the basis of foregoing circuit structure, preferably also include carrying out overcurrent protection to every road so that Miniature inverter exists
Work in normal state, is not up to overcurrent protection threshold values per the signal produced by road；Miniature inverter is operated in improper
Under state, protection signal can be produced per road.The control method is carried on the premise of the normal circuit operation of Miniature inverter is guaranteed
High efficiency, reduces the energy loss caused because gathering protection signal.I.e. described inverter can also be protected including multichannel excessively stream
Protection circuit.Circuit structure per road overcurrent protection module is as shown in figure 5, which is coordinated with DC/DC modular converters and voltage changing module.Its
Structure of the middle the present embodiment current foldback circuit using three road windings, Ji Mei roads voltage changing module include winding A and winding B, winding
D, and current foldback circuit includes electrochemical capacitor C and protection circuit.Specifically, in the same branch road of main power circuit, series connection
Transformer Winding A and winding B, winding A terminals 1 are connected with the negative terminal of solar energy photovoltaic panel, the anode of solar energy photovoltaic panel
Connect the first end of the prime mos pipe in the positive pole and DC/DC modular converters of electrochemical capacitor C respectively；The terminals 2 of winding A with
The terminals 3 of winding B are connected and are connected to the negative pole of electrochemical capacitor C, and the terminals 4 of winding B are connected in correspondence DC/DC modular converters
In prime mos pipe the second end；The terminals 5 and 6 of D windings are connected to protection circuit carries out overcurrent protection.In circuit, winding
The terminals 1 of A are Same Name of Ends with the terminals 4 of winding B, and in normal state, the winding D of transformer secondary is produced for circuit work
Signal is not up to overcurrent protection threshold values；Circuit is operated under abnormal condition, and the winding D of transformer secondary can produce protection letter
Number.This kind of structure, on the premise of normal circuit operation is guaranteed, improves efficiency, reduces what is caused because gathering protection signal
Energy loss.
For the secondary of each voltage changing module, circuit accesses DC/ after connecting between the secondary of each voltage changing module
Input p, q in AC inversion modules；The voltage x current of q, p input is reverse into standard sine by the DC/AC inversion modules
Export after ripple；The EMC filtration modules are connected to the grid after carrying out EMC filtering to the sine wave.
The DC/AC inversion modules preferably, can include rectification circuit, LC filter circuits and the rear class being sequentially connected
Mos circuits, further, wherein rectification circuit carries out rectification process to voltage x current by rectifier bridge is formed after diode connection；
The LC filter circuits realize filter action by inductance and capacitance connection to form steamed bread sine wave；The rear class mos circuit
Parallel network circuit is formed after being connected respectively by 4 rear class metal-oxide-semiconductors two-by-two, and it is grid-connected to enter horizontal lock, zero crossing lock is carried out by rear class mos
Phase, exports after being shaped to standard sine wave.
The principle of the inverter is：When the solar energy photovoltaic panel of polylith electric property isolation is distinguished as direct current photovoltaic module
Each independent importation of inverter is connected to, the DC/DC modular converters of multichannel independence are every using MPPT function real-time trackings
The maximum power point of individual input module, and respective grid-connected power is produced, the former limit of voltage changing module is each connected to, it is now many
Power on the solar energy photovoltaic panel input module of road remains independent, and the series connection of multiple voltage changing module secondary, multichannel originally
Independent grid-connected power pools a total grid-connected power, then after single DC/AC inversion modules are reverse into exchange is incorporated to electricity
Net.
The direct current of the solar energy photovoltaic panel carries out maximum power point using MPPT functions by DC/DC modular converters and chases after
Track, the structure of secondary series connection in parallel by voltage changing module former limit, make the energy centralization of direct current input module in a bit, Ran Houjin
The inversion grid connection of row DC/AC inversion modules.This design, using multichannel transformator and its former secondary characteristic, it is ensured that input
The independence of the direct current input module of Liao Mei roads voltage changing module former limit connection while with the electrical isolation for exporting, is also ensured, is made
Get Mei roads solar energy photovoltaic panel input module can follow the trail of maximum power point, while per road voltage changing module secondary series connection so that every
Road direct current input module energy centralization is in same point, it is ensured that the reliability of DC/AC inversion grid connections, eliminates and makes because being input into multichannel
Into the defect that Converting Unit branch road is excessive, product cost is reduced, improve overall efficiency.
The multichannel MPPT Miniature inverter exports the method confluxed simultaneously using each road, adopts parallel way to input, really
The direct current input of Bao Liaoge roads can will many with independent trails maximum power point after each road carries out boost in voltage and convergence processing
The energy centralization of road DC voltage carries out inversion grid connection in a bit.Effectively can overcome because certain block solar panel is abnormal and
Overall non-serviceable problem is caused, and is effectively solved because the performance of direct current photovoltaic module such as solar panel is different,
The polylith solar panel maximum power point that illumination difference is caused is different, and causes effectively track multichannel each in real time
The problem of maximum power point, and effectively solve merely using multiple independent Miniature inverters, cause multiple DC/AC portions
Point defect, while reducing DC/AC components and parts costs, further through transformator the distribution of grid-connected required total current independence
To respective solar panel.
In order to verify that this utility model can effectively solve the problem that polylith solar panel maximum power point is different, and cause not
Effectively can track in real time multichannel each maximum power point and because be input into multichannel cause the excessive defect of Converting Unit branch road
Problem, and propose that one verifies example.
This checking example is by taking a four road MPPT Miniature inverters as an example, as shown in figure 4, its input is four 250W sun
Can cell panel, No. 4 transformators, 4 tunnels possess DC/DC transducers, DC/AC inverters and the EMC wave filter of overcurrent protection.When four pieces
In the case of the condition identical such as solar panel performance and illumination, every piece of solar panel produces 250W power, four tunnels
MPPT controller traces into maximum power point 250W respectively, and the former secondary of No. four transformators produces identical voltage x current, leads to
Cross transformator secondary converge at power after be input into a DC/AC inverter in, carry out parallel network reverse.
Assume that causes power drops to 100W when first piece of solar panel is because of the change of performance or illumination condition,
Other three pieces remain at 250W, can ensure that four tunnel MPPT controllers are still operated in maximum power point using this utility model,
Now to maximum power point 100W, other three tunnels still remain in maximum power point to first via MPPT controller real-time tracing
250W, is reflected in the reduction of first via primary voltage of transformer value, and current value is constant, other three tunnels primary voltage of transformer and electric current
Value is constant, and the total current of four road transformer secondary series connection is constant, as first via original edge voltage is reduced so that the road transformator pair
Polygonal voltage is reduced, and causes total voltage value to reduce, and gross output is 850W.Gross output is input into into one for 850W finally
Parallel network reverse is carried out in DC/AC inverters.
When first piece of solar panel recovers normal, when power gos up to 250W, now first via MPPT controller reality
When follow the trail of to maximum power point 250W, other three tunnels still remain in maximum power point 250W, are reflected in first via transformer primary
Polygonal voltage value is gone up, and current value is constant, and other three tunnels primary voltage of transformer and current value are constant, four transformer secondary series connection
Total current it is constant, due to first via original edge voltage go up so that the road transformer secondary voltage recovery, cause total voltage value return
Rise, gross output recovers to 1000W.It is finally that gross output is grid-connected to carry out in 1000W one DC/AC inverter of input
Inversion.
Technical characterstic of the present utility model is applicable not only to the change of solar panel power all the way, any four pieces of sun
The situation of energy cell panel changed power is equally applicable.And, it is photovoltaic battery panel that this utility model is applicable not only to input, together
When be applicable to other and require that multipath independent direct current is input into, converge at application of some output.
To sum up, a kind of control method of multichannel MPPT photovoltaic miniature inverter that this utility model is provided and miniature inversion
Device.The method can make a Miniature inverter while multiple photovoltaic battery panels are carried out with MPPT maximum power point tracking and direct current friendship is carried out
Circulation is changed, then it is internal conflux output can be with the alternating current of direct grid-connected.Such that it is able to keep the high of Miniature inverter to generate electricity
The characteristic of efficiency declines the cost of low Miniature inverter.
Embodiment of the present utility model is explained in detail above in conjunction with accompanying drawing, but this utility model is not limited to
Above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, can be with without departing from this utility model
Make a variety of changes on the premise of objective.
Claims (8)
1. a kind of multichannel MPPT Miniature inverter, it is characterised in that including multichannel DC/DC modular converter, multichannel voltage changing module,
DC/AC inversion modules and EMC filtration modules, wherein being connected with voltage changing module all the way per road DC/DC modular converters；The multichannel
Voltage changing module is connected with DC/AC inversion modules；The DC/AC inversion modules are connected with EMC filtration modules；Every road
DC/DC modular converters, carry out power draw and MPPT maximum power point tracking for the direct current photovoltaic module to being connected, and obtain per road
Power output under maximum power point；The multichannel voltage changing module, wherein turning for the DC/DC to connecting per road voltage changing module
Boost in voltage in the power output on the obtained every road of mold changing block, and boosting Hou Mei roads power output is always collected to one
Power output；The DC/AC inversion modules, for by the general power output inversion of gained for exchange；The EMC filtration modules,
For being connected to the grid after carrying out EMC filtering to exchange obtained by DC/AC inversion modules.
2. multichannel MPPT Miniature inverter according to claim 1, it is characterised in that：Described each DC/DC modular converter is also
Including current foldback circuit.
3. multichannel MPPT Miniature inverter according to claim 1, it is characterised in that：Described each DC/DC modular converter bag
Connect respectively in including 4 prime metal-oxide-semiconductors, and 4 prime metal-oxide-semiconductors two-by-two and form phase whole-bridging circuit.
4. multichannel MPPT Miniature inverter according to claim 1, it is characterised in that：Described each multichannel voltage changing module is adopted
Transformator.
5. multichannel MPPT Miniature inverter according to claim 1, it is characterised in that：The DC/AC inversion modules include according to
The rectification circuit of secondary connection, LC filter circuits and rear class mos circuit.
6. multichannel MPPT Miniature inverter according to claim 5, it is characterised in that：The rectification circuit is by four diodes
Composition, in four diodes, connection forms rectifier bridge respectively two-by-two.
7. multichannel MPPT Miniature inverter according to claim 5, it is characterised in that：The LC filter circuits include inductance,
And the electric capacity with inductance connection.
8. multichannel MPPT Miniature inverter according to claim 5, it is characterised in that：After the rear class mos circuit includes 4
Level metal-oxide-semiconductor, in 4 rear class metal-oxide-semiconductors, connection forms parallel network circuit respectively two-by-two.
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| CN107834652A (en) * | 2017-11-27 | 2018-03-23 | 王子豪 | A kind of battery step-up method |
| WO2019115403A1 (en) * | 2017-12-15 | 2019-06-20 | Sma Solar Technology Ag | Inverter |
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| US10651735B2 (en) | 2017-02-06 | 2020-05-12 | Futurewei Technologies, Inc. | Series stacked DC-DC converter with serially connected DC power sources and capacitors |
| US10665743B2 (en) * | 2017-02-16 | 2020-05-26 | Futurewei Technologies, Inc. | Distributed/central optimizer architecture |
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| ITVA20080002A1 (en) * | 2008-01-10 | 2009-07-11 | St Microelectronics Srl | PHOTOVOLTAIC SYSTEM WITH MULTICELLULAR PANELS WITH MULTIPLATE DC-DC CONVERSION FOR CELL GROUPS IN SERIES OF EACH PANEL AND PHOTOVOLTAIC PANEL STRUCTURE |
| CN101494385A (en) * | 2009-02-18 | 2009-07-29 | 常州瑞闪新能源有限公司 | Solar photovoltaic parallel inverter control system based on LCL filtering |
| US8106543B2 (en) * | 2009-10-28 | 2012-01-31 | Chicony Power Technology Co., Ltd. | Solar generator and solar cell thereof distributively performing maximum power point tracking |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107834652A (en) * | 2017-11-27 | 2018-03-23 | 王子豪 | A kind of battery step-up method |
| WO2019115403A1 (en) * | 2017-12-15 | 2019-06-20 | Sma Solar Technology Ag | Inverter |
| US11522494B2 (en) | 2017-12-15 | 2022-12-06 | Sma Solar Technology Ag | Inverter |
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