CN107204627A - A kind of inverter system operation method and device and inverter system - Google Patents
A kind of inverter system operation method and device and inverter system Download PDFInfo
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- CN107204627A CN107204627A CN201610149541.XA CN201610149541A CN107204627A CN 107204627 A CN107204627 A CN 107204627A CN 201610149541 A CN201610149541 A CN 201610149541A CN 107204627 A CN107204627 A CN 107204627A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 87
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- 238000004891 communication Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
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- 238000005516 engineering process Methods 0.000 description 2
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H02J3/383—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a kind of inverter system operation method and device and inverter system, this method includes：According to input power, the first integrated mode of corresponding inverter unit is determined, first integrated mode is the integrated mode with maximum conversion efficiency under the input power；The inverter unit for needing to open is determined according to first integrated mode of determination, it would be desirable to which the inverter unit of unlatching is set to running status, and the inverter unit that need not be opened is set to off into closed state.Pass through the solution of the present invention, under the different input power of inverter system, take different integrated modes, pass through opening section or whole inverter units, the inverter unit of place in the operating condition is worked under maximum conversion efficiency, so that power output is maximized, unnecessary energy loss is reduced, the service behaviour of inverter system is improved.
Description
Technical field
The present invention relates to energy power field, espespecially a kind of inverter system operation method and device and inverse
Become device system.
Background technology
Mesh coal, oil etc. are the non-renewable energy, in the future one day can be by other energy substitutions.
The energy of solar energy is inexhaustible, and photovoltaic power generation technology gradually increases in the ratio regular meeting of energy domain, just opens
Begin by remote villages and special applications, to generating electricity by way of merging two or more grid systems, direction is developed.Parallel network power generation enters as it
The inevitable outcome of electric power sizable application, it will maximum photovoltaic generation market exemplified by being.Solar panel
Array and inverter are two most important parts in grid-connected photovoltaic system.Solar panel array
The luminous energy of the sun is converted into electric energy, dc point is exported.Single civilian electric power is based on Alternating Current Power Supply, therefore
Alternating current rear must be converted to by inverter by solar energy and may be incorporated into power network.Inverter in solar energy simultaneously
Play an important roll in net electricity generation system.
Although solar energy resources is inexhaustible, because solar radiation density is relatively low, and other factors,
Cause the conversion efficiency of solar cell (PV batteries) very low.At present, most of solar cells
Conversion efficiency be only 11%~20% or so.In this case, the efficiency of photovoltaic DC-to-AC converter is lifted, it is right
Seem most important in the whole efficiency for lifting solar grid-connected electricity generation system.It is exemplary referring to Fig. 1
Inverter conversion efficiency schematic diagram, from figure 1 it appears that with the change of input power,
The conversion efficiency of inverter is different, and Fig. 2 is bent for the exemplary inverter power output of one day change
Line, wherein, transverse axis is the time, represent in one day not in the same time, the longitudinal axis is power, and unit is KW,
Figure it is seen that as the conditions such as intensity of illumination are different in one day, not inverter output in the same time
Power is different.
If at certain moment, what the peak power that PV batteries can be provided was to determine, that is to say, that inverse
In the case that the input power of change device system is certain, substantially each family of MPPT efficiency is all similar, substantially
99% or so.So, the influence most important factor of generated energy is exactly inverter efficiency.Can be with from Fig. 2
Find out, in one day, because the factor such as intensity of illumination is different, the power output of inverter is change.And
As can be seen from Figure 1 when different output power, the efficiency of inverter is different.And different shaped
Number, the efficiency curve of the inverter of different manufacturers is also different.Current inverter is passive generating,
When different output power, inverter can not necessarily work near pressure point of maximum efficiency, that is,
Say, in the case of different input powers, it is impossible to ensure maximum generating output, energy can be caused
Unnecessary energy loss.
The content of the invention
In order to solve the above problems, the present invention propose a kind of inverter system operation method and device and
Inverter system, can reduce energy loss of the inverter system under different input powers.
In order to achieve the above object, the present invention proposes a kind of inverter system operation method, for controlling
The running of inverter system, the inverter system includes N number of inverter unit；N to be more than or
Integer equal to 2；
The inverter system operation method includes：
According to input power, the first integrated mode of corresponding inverter unit, first combination are determined
Pattern is the integrated mode with maximum conversion efficiency under the input power；
According to first integrated mode of determination, it would be desirable to which the inverter unit of unlatching is set to run shape
State, closed state is set to off by the inverter unit that need not be opened.
Preferably, it is described according to input power, it is determined that the first of the inverter unit opened the need for correspondence
Integrated mode includes：
According to input power, the whole integrated modes for meeting the input power are chosen；
Calculate the selected corresponding conversion efficiency of each integrated mode；
Compare the corresponding conversion efficiency of each integrated mode, and choose the maximum integrated mode of conversion efficiency and make
For the first integrated mode；
Preferably, the corresponding conversion efficiency of each integrated mode selected by the calculating includes：
Following operation is carried out respectively for each selected integrated mode：
Obtain the efficiency curve for the inverter unit opened in the integrated mode；
According to the efficiency curve of the inverter unit of each unlatching, determine that each inverter unit opened exists
Conversion efficiency under the input power；
According to the conversion efficiency of the inverter unit of each unlatching, the corresponding conversion effect of the integrated mode is obtained
Rate.
Preferably, the inverter system operation method also includes：
At predetermined intervals, the efficiency curve of each inverter unit is updated.
Preferably, it is identical in the power output of each inverter unit, and each inverter unit has phase
In the case of same efficiency curve identical,
It is described according to input power, choose and meet whole integrated modes of the input power and include：
The minimal amount Z for the inverter unit opened the need for determining correspondence according to input power；
Selected integrated mode includes the integrated mode for opening M inverter unit, wherein, M is
Each integer more than or equal to Z and less than or equal to N；
The corresponding conversion efficiency of each integrated mode selected by the calculating includes：
The power output of an inverter unit in M inverter unit is calculated, according to inverter unit
Efficiency curve, determines conversion efficiency V of the inverter unit under the input power and power output.
Preferably, described according to input power, determine also to include before corresponding first integrated mode：
The input power of inverter system is monitored, when input power changes, is performed described according to defeated
Enter power, the step of determining corresponding first integrated mode.
In order to achieve the above object, the invention also provides a kind of inverter system running gear, the dress
Put including：
Integrated mode determining unit, for according to input power, determining the first of corresponding inverter unit
Integrated mode, first integrated mode is the combination with maximum conversion efficiency under the input power
Pattern；
Integrated mode switch element, for first integrated mode according to determination, it would be desirable to unlatching
Inverter unit is set to running status, and the inverter unit that need not be opened is set to off into closed state.
Preferably, the integrated mode determining unit includes：
First chooses module, for according to input power, choosing the whole combinations for meeting the input power
Pattern；
Conversion efficiency computing module, for calculating the selected corresponding conversion efficiency of each integrated mode；
Second chooses module, for comparing the corresponding conversion efficiency of each integrated mode, and chooses conversion effect
The maximum integrated mode of rate is used as the first integrated mode；
Preferably, the conversion efficiency computing module is additionally operable to：
For each integrated mode in selected integrated mode, obtain what is opened in the integrated mode
The efficiency curve of inverter unit；According to the efficiency curve of the inverter unit of each unlatching, each is determined
Conversion efficiency of the inverter unit of unlatching under the input power；According to the inverter list of each unlatching
The conversion efficiency of member, obtains the corresponding conversion efficiency of the integrated mode.
Preferably, inverter system running gear also includes：Monitoring unit,
The monitoring unit at predetermined intervals, updates the efficiency curve of each inverter unit.
Preferably, it is identical in the power output of each inverter unit, and each inverter unit has phase
In the case of same efficiency curve identical,
The first selection module is additionally operable to：The inverter opened the need for determining correspondence according to input power
The minimal amount Z of unit；Selected integrated mode includes the integrated mode for opening M inverter unit,
Wherein, M is each integer more than or equal to Z and less than or equal to N；
The conversion efficiency computing module is additionally operable to：The integrated mode pair when M is different values is calculated respectively
The conversion efficiency answered；Wherein, for the integrated mode of M inverter unit of unlatching, M is calculated individual inverse
Become the power output of an inverter unit in device unit, according to the efficiency curve of inverter unit, it is determined that
Conversion efficiency V of the inverter unit under the input power and power output.
Preferably, described device also includes, input power monitoring unit, for monitoring inverter system
Input power, when input power changes, combination of notifications pattern determining unit is according to new input work
Rate determines corresponding first integrated mode, and integrated mode switch element according to the first new integrated mode,
The part inverter unit for needing to open is set to running status, remaining inverter unit is set to
Closed mode.
In order to achieve the above object, the invention also provides a kind of inverter system, the inverter system
Including N number of inverter unit；N is the integer more than or equal to 2；The inverter system also includes upper
State any inverter system running gear.
Compared with prior art, the technical scheme that the present invention is provided includes：According to input power, it is determined that pair
First integrated mode of the inverter unit answered, first integrated mode is that have under the input power
The integrated mode of maximum conversion efficiency；Determined to need what is opened according to first integrated mode of determination
Inverter unit, it would be desirable to which the inverter unit of unlatching is set to running status, it is inverse by what need not be opened
Become device unit and be set to off closed state.By the solution of the present invention, in the different input work of inverter system
In the case of rate, different integrated modes are taken, that is, in inverter system, each inverter unit
Running status with the different and different of input power, by opening section or whole inverter units, make
The inverter unit that must locate in the operating condition can work under maximum conversion efficiency, so that defeated
Go out power maximization, reduce unnecessary energy loss, improve the service behaviour of inverter system.
Brief description of the drawings
The accompanying drawing in the embodiment of the present invention is illustrated below, the accompanying drawing in embodiment is used for this hair
Bright further understands, and is used to explain the present invention together with specification, does not constitute to present invention protection model
The limitation enclosed.
Fig. 1 is the schematic diagram of the conversion efficiency of exemplary inverter；
Fig. 2 is the exemplary inverter power output change curve of one day；
Fig. 3 A and Fig. 3 B are respectively that the embodiments of the invention provide a kind of stream of inverter system operation method
Cheng Tu；
Fig. 4 A are the pie graph of a 500KW photovoltaic inverter system；
Fig. 4 B be Fig. 4 A shown in inverter system in inverter unit efficiency curve schematic diagram；
Fig. 4 C are the flow chart of the inverter system operation method based on the inverter system shown in Fig. 4 A；；
Fig. 5 is a kind of structure composition schematic diagram of inverter system running gear proposed by the present invention.
Embodiment
For the ease of the understanding of those skilled in the art, present invention work is further retouched below in conjunction with the accompanying drawings
State, can not be used for limiting the scope of the invention.It should be noted that in the case where not conflicting,
The various modes in embodiment and embodiment in the application can be mutually combined.
Referring to Fig. 3 A and Fig. 3 B, the embodiments of the invention provide a kind of inverter system operation method, use
In the running of control inverter system, the inverter system includes N number of inverter unit；N is
Integer more than or equal to 2；
As shown in Figure 3A, the inverter system operation method includes：
Step 100, according to input power, the first integrated mode of corresponding inverter unit, institute are determined
It is the integrated mode with maximum conversion efficiency under the input power to state the first integrated mode；
Step 200, according to first integrated mode of determination, it would be desirable to which the inverter unit of unlatching is set
Running status is set to, the inverter unit that need not be opened is set to off closed state.
Wherein, integrated mode can be the inverter unit for needing to open, or need the inversion of closing
Device unit or in the case of inverter unit configuration parameter identical, integrated mode can need to open
The number of the inverter unit opened.Therefore the inverter for needing to open can be determined according to the first integrated mode
Unit.Specifically, determining the first integrated mode of corresponding inverter unit includes：Determine corresponding need
Specific part in first integrated mode of the inverter unit to be opened, i.e., whole inverter units is set
For running status, remainder is set to off closed state.
Wherein, as shown in Figure 3A, it is described according to input power in step 100, determine corresponding need
First integrated mode of the inverter unit to be opened includes：
Step 110, according to input power, the whole integrated modes for meeting the input power are chosen；
Step 120, the selected corresponding conversion efficiency of each integrated mode is calculated；
Step 130, compare the corresponding conversion efficiency of each integrated mode, and choose conversion efficiency maximum
Integrated mode is used as the first integrated mode；
Wherein, in step 120, the corresponding conversion efficiency of each integrated mode that calculates includes：
Step 121, for any one second integrated mode in whole integrated modes, obtain second and combine
The efficiency curve for each inverter unit opened in pattern；
According to the efficiency curve of the inverter unit of each unlatching, determine that each inverter unit opened exists
Conversion efficiency under current input power；
According to the conversion efficiency of the inverter unit of each unlatching, second integrated mode is obtained corresponding
Conversion efficiency.
Step 122, according to the method in step 121, each combination die in whole integrated modes is calculated
The conversion efficiency of formula.
In the embodiment of the present invention, the inverter system operation method also includes：
At predetermined intervals, the efficiency curve of each inverter unit is updated.
, in the step 120, can be according to renewal after the efficiency curve of each inverter unit is updated
Efficiency curve calculate the transformation curve of each integrated mode.
It is identical with the power output of each inverter unit in inversion system below, and each inverter unit tool
The application scenarios for having identical efficiency curve are illustrated.
It is identical in the power output of each inverter unit, and each inverter unit has identical efficiency
In the case of curve identical,
In step 110, according to input power, the whole integrated mode bags for meeting the input power are chosen
Include：The minimal amount Z for the inverter unit opened the need for determining correspondence according to input power；Then all
Integrated mode include open M inverter unit, wherein, M for more than or equal to Z and be less than or
Integer sequence equal to N.
For example, the 500KW constituted for the inverter unit by 4 125KW, when input power is
, it is necessary to which the minimal amount Z for the inverter unit opened is 2 during 200KW.
In step 120, calculating the corresponding conversion efficiency of each integrated mode includes：
According to the efficiency curve of inverter unit, calculate open each value number in integer sequence respectively
The corresponding conversion efficiency of inverter unit.
For example, there are three kinds of integrated modes, wherein the inverter unit opened is respectively 2,3,4, then divide
Corresponding conversion efficiency when Ji Suan not open 2 inverter units, correspondence when opening 3 inverter units
Conversion efficiency, and open 4 inverter units when corresponding conversion efficiency.
Specifically, the integrated mode for opening M inverter unit, can be according to input efficiency/M
It is determined that the input power of one of inverter unit, by power output determination power output, by defeated
Go out power kitchen divided by rated power, obtain power output percentage, can be by power output percentage
Corresponding conversion efficiency V is obtained on efficiency curve.Because the conversion efficiency of each inverter unit is identical,
Therefore the conversion efficiency of an inverter unit is the corresponding conversion efficiency of the integrated mode.
For example, the 500KW constituted for the inverter unit by 4 125KW, when input power is
, it is necessary to which the minimal amount Z for the inverter unit opened is 2 during 200KW.It is 2 for opening number
For integrated mode, can one of inverter unit input power be 100KW, output power
About 98KW, by power output 98KW divided by rated power 125KW, obtains power output percentage
Than 98/125=78.4%, by power output percentage 78.4%, correspondence can be obtained on efficiency curve
Conversion efficiency V, by taking the efficiency curve shown in Fig. 4 B as an example, corresponding conversion efficiency is about 98.3,
I.e. the corresponding conversion efficiency of the integrated mode is 98.3.
Inverter system MEPT efficiency is illustrated below：
Wherein, ηMEPTFor inverter system MEPT efficiency, PO(t) it is the instantaneous value of inverter output power,
PDC(t) it is the instantaneous value of inverter DC input power.
Illustrated with reference to a specific example.
It is the pie graph of a 500KW photovoltaic inverter system referring to Fig. 4 A, the photovoltaic DC-to-AC converter system
The 500KW inverter systems that system is made up of 4 125KW inverter unit, the input connection of its direct current
Together, the efficiency curve of each inverter unit is identical, and efficiency curve is as shown in Figure 4 B.
The operation method based on the photovoltaic inverter system is illustrated below, referring to Fig. 4 C, based on this
The operation method of photovoltaic inverter system includes：
Step 1, at a time, the DC input power of inverter system is X；
Step 2, X/125 rounds up as Y；
Step 3, to complete the conversion that power is X, inverter unit need the number of work between Y and
Between 4, M is set as the integer ordered series of numbers between Y and 4；That is, N >=work is inverse
Become unit number M >=Z；
Step 4, when M takes different value, according to the method in step 120, determine inverter unit most
The inverter unit number of the work of high efficiency point, acquisition result is Z；That is, in the first combination
Under pattern, there is Z inverter unit in running order；
Step 5, (4-Z) individual inversion unit is closed, retains Z inverter unit work；
Now 500KVA inverter systems work in maximum MEPT efficient points, and its power output is maximum；
Step 6, if condition change causes DC input power X to change, repeat step 1~5；
In the embodiment of the present invention, when the input power of inverter system changes, according to new input
Power determines corresponding first integrated mode, and according to the first new integrated mode, it would be desirable to the portion of unlatching
Divide inverter unit to be set to running status, remaining inverter unit is set to off closed state.
Technical scheme includes following beneficial effect：
1st, accuracy
As engineering staff designs different, efficiency may not be to increase with the increase of power output；Most
High point may not be to appear in peak (referring to accompanying drawing 4C).Simple reduced with power output is just reduced
Inversion unit number, brings and is not necessarily power output (generated energy) highest.
Present invention provides a more accurate method, to reach generated energy highest target.Utilize
The method of default efficiency curve, the realtime power provided with PV (or power output) is different, according to
Different number of inversion unit work, sees the comparison of efficient point and efficiency curve, finds a job most efficient
Inversion unit number during rate point, closes unnecessary inverter unit, to reach remaining inversion unit all works
Make in best efficiency point, meet the requirement of capacity；
2nd, initiative
One-of-a-kind system can only passively generate electricity, it is impossible to by change the first integrated mode come active obtaining system most
High efficiency point generates electricity；So MEPT efficiency is to stand-alone type inverter (or single stand-alone type inverter) nothing
Meaning.MEPT efficiency is directed to the combination of modularization inverter system or multiple inverters；
3rd, real-time
Efficiency curve can not only be preset before dispatching from the factory, can also be real in inverter system running
Shi Gengxin；
4th, wide scope is adapted to
It is known that difference of the photovoltaic generating system with conditions such as intensities of illumination, the output in one day
Power can be from 0~100%~0.Base within a certain period of time is exported rather than UPS, communication power supply even load
Originally it is to determine.
5th, MEPT is substantially tracking direct current input
Power output is the factors such as power and MPPT efficiency, the system effectiveness that can be provided by PV batteries
Determine.And MPPT efficiency is general more than 99%, thus, for basic, MEPT is maximum
The realization of efficient point tracking is to track depending on PV exports the direct current of inverter (input) in real time.And PV
The size of power output is, as the conditions such as intensity of illumination are different, 0~100%~0 mistake to be undergone in one day
Journey, and this is the essential distinction with traditional modular UPS and modular communication power supply, traditional modular
The module dormancy of UPS and modular communication power supply is determined according to output loading, and output loading is one
It is to determine substantially in the section time.
6th, various dimensions
The output of PV batteries is not only with intensity of illumination and relevant with many factors such as environment temperatures.
And inverter system efficiency, it is relevant with many factors such as input voltage, temperature, power output.The present invention,
Consider many factors, depict it is various under the conditions of efficiency curve.Sampled various information by monitoring unit,
And judge maximum power output (system MEPT efficiency highest).
7th, adapt to wide
Inverter unit can be that power output etc. is identical or different, main herein
Described according to the inverter unit of equal-wattage, but protection not limited to this.
Realize that MEPT inverter systems each unit can install an interior of equipment cabinet, can also be separately mounted to
Different interior of equipment cabinet, each unit can be exactly individually a rack, and form is not limited；
Inverter unit is not limited topology, can be two level or three level, many level
Deng；Can also there is isolation without isolation；Can be one-stage transfor-mation or two-stage or multi-stage transformation；
Have communication between inverter unit and monitoring unit, communication modes can be it is wired or
Wireless, form is not limited；By communication, it can exchange information and control.
Based on design same as the previously described embodiments or similar, the embodiment of the present invention also provides a kind of inverter
System operation device, is arranged on inverter system, referring to Fig. 5, a kind of inverter proposed by the present invention
System operation device includes：
Integrated mode determining unit 10, for according to input power, determining the of corresponding inverter unit
One integrated mode, first integrated mode is the group with maximum conversion efficiency under the input power
Syntype；
Integrated mode switch element 20, for first integrated mode according to determination, it would be desirable to open
Inverter unit be set to running status, the inverter unit that need not be opened is set to off closed state.
In the embodiment of the present invention, the integrated mode determining unit 10 includes：
First chooses module 11, for according to input power, choosing meet the input power whole groups
Syntype；
Conversion efficiency computing module 12, for calculating the corresponding conversion effect of each selected integrated mode
Rate；
Second chooses module 13, for comparing the corresponding conversion efficiency of each integrated mode, and chooses conversion
The maximum integrated mode of efficiency is used as the first integrated mode；
In the embodiment of the present invention, the conversion efficiency computing module 12 is additionally operable to：
For each integrated mode in selected integrated mode, obtain what is opened in the integrated mode
The efficiency curve of inverter unit；According to the efficiency curve of the inverter unit of each unlatching, each is determined
Conversion efficiency of the inverter unit of unlatching under the input power；According to the inverter list of each unlatching
The conversion efficiency of member, obtains the corresponding conversion efficiency of the integrated mode.
In the embodiment of the present invention, inverter system running gear also includes：Monitoring unit 30,
The monitoring unit at predetermined intervals, updates the efficiency curve of each inverter unit.
It is identical in the power output of each inverter unit in the embodiment of the present invention, and each inverter list
Member has in the case of identical efficiency curve identical,
The first selection module is additionally operable to：The inverter opened the need for determining correspondence according to input power
The minimal amount Z of unit；Selected integrated mode includes the integrated mode for opening M inverter unit,
Wherein, M is each integer more than or equal to Z and less than or equal to N；
The conversion efficiency computing module is additionally operable to：The integrated mode pair when M is different values is calculated respectively
The conversion efficiency answered；Wherein, for the integrated mode of M inverter unit of unlatching, M is calculated individual inverse
Become the power output of an inverter unit in device unit, according to the efficiency curve of inverter unit, it is determined that
Conversion efficiency V of the inverter unit under the input power and power output.
In the embodiment of the present invention, described device also includes, input power monitoring unit 40, inverse for monitoring
Become device system input power, when input power changes, combination of notifications pattern determining unit according to
New input power determines corresponding first integrated mode, and integrated mode switch element is according to new the
One integrated mode, it would be desirable to which the part inverter unit of unlatching is set to running status, by remaining inversion
Device unit is set to off closed state.
Based on design same as the previously described embodiments or similar, the embodiment of the present invention also provides a kind of inverter
System, the inverter system includes N number of inverter unit；N is the integer more than or equal to 2；Institute
Stating inverter system also includes any inverter system running gear provided in an embodiment of the present invention.
It should be noted that embodiment described above be for only for ease of it will be understood by those skilled in the art that
, the protection domain being not intended to limit the invention, in the premise for the inventive concept for not departing from the present invention
Under, any obvious replacement and improvement that those skilled in the art are made to the present invention etc. is at this
Within the protection domain of invention.
Claims (13)
1. a kind of inverter system operation method, the running for controlling inverter system, its feature
It is, the inverter system includes N number of inverter unit；N is the integer more than or equal to 2；
The inverter system operation method includes：
According to input power, the first integrated mode of corresponding inverter unit, first combination are determined
Pattern is the integrated mode with maximum conversion efficiency under the input power；
According to first integrated mode of determination, it would be desirable to which the inverter unit of unlatching is set to run shape
State, closed state is set to off by the inverter unit that need not be opened.
2. inverter system operation method according to claim 1, it is characterised in that the basis
Input power, it is determined that the first integrated mode of the inverter unit opened the need for correspondence includes：
According to input power, the whole integrated modes for meeting the input power are chosen；
Calculate the selected corresponding conversion efficiency of each integrated mode；
Compare the corresponding conversion efficiency of each integrated mode, and choose the maximum integrated mode of conversion efficiency and make
For the first integrated mode.
3. inverter system operation method according to claim 2, it is characterised in that the calculating
The selected corresponding conversion efficiency of each integrated mode includes：
Following operation is carried out respectively for each selected integrated mode：
Obtain the efficiency curve for the inverter unit opened in the integrated mode；
According to the efficiency curve of the inverter unit of each unlatching, determine that each inverter unit opened exists
Conversion efficiency under the input power；
According to the conversion efficiency of the inverter unit of each unlatching, the corresponding conversion effect of the integrated mode is obtained
Rate.
4. inverter system operation method according to claim 3, it is characterised in that the inversion
Device system operation method also includes：
At predetermined intervals, the efficiency curve of each inverter unit is updated.
5. inverter system operation method according to claim 2, it is characterised in that
It is identical in the power output of each inverter unit, and each inverter unit has identical efficiency
In the case of curve identical,
It is described according to input power, choose and meet whole integrated modes of the input power and include：
The minimal amount Z for the inverter unit opened the need for determining correspondence according to input power；
Selected integrated mode includes the integrated mode for opening M inverter unit, wherein, M is
Each integer more than or equal to Z and less than or equal to N；
The corresponding conversion efficiency of each integrated mode selected by the calculating includes：
The power output of an inverter unit in M inverter unit is calculated, according to inverter unit
Efficiency curve, determines conversion efficiency V of the inverter unit under the input power and power output.
6. inverter system operation method according to claim 1, it is characterised in that at described
According to input power, determine also to include before corresponding first integrated mode：
The input power of inverter system is monitored, when input power changes, is performed described according to defeated
Enter power, the step of determining corresponding first integrated mode.
7. a kind of inverter system running gear, it is characterised in that described device includes：
Integrated mode determining unit, for according to input power, determining the first of corresponding inverter unit
Integrated mode, first integrated mode is the combination with maximum conversion efficiency under the input power
Pattern；
Integrated mode switch element, for first integrated mode according to determination, it would be desirable to unlatching
Inverter unit is set to running status, and the inverter unit that need not be opened is set to off into closed state.
8. inverter system running gear according to claim 7, it is characterised in that the combination
Pattern determining unit includes：
First chooses module, for according to input power, choosing the whole combinations for meeting the input power
Pattern；
Conversion efficiency computing module, for calculating the selected corresponding conversion efficiency of each integrated mode；
Second chooses module, for comparing the corresponding conversion efficiency of each integrated mode, and chooses conversion effect
The maximum integrated mode of rate is used as the first integrated mode.
9. inverter system running gear according to claim 8, it is characterised in that the conversion
Efficiency calculation module is additionally operable to：
For each integrated mode in selected integrated mode, obtain what is opened in the integrated mode
The efficiency curve of inverter unit；According to the efficiency curve of the inverter unit of each unlatching, each is determined
Conversion efficiency of the inverter unit of unlatching under the input power；According to the inverter list of each unlatching
The conversion efficiency of member, obtains the corresponding conversion efficiency of the integrated mode.
10. inverter system running gear according to claim 8, it is characterised in that inverter
System operation device also includes：Monitoring unit,
The monitoring unit at predetermined intervals, updates the efficiency curve of each inverter unit.
11. inverter system running gear according to claim 8, it is characterised in that
It is identical in the power output of each inverter unit, and each inverter unit has identical efficiency
In the case of curve identical,
The first selection module is additionally operable to：The inverter opened the need for determining correspondence according to input power
The minimal amount Z of unit；Selected integrated mode includes the integrated mode for opening M inverter unit,
Wherein, M is each integer more than or equal to Z and less than or equal to N；
The conversion efficiency computing module is additionally operable to：The integrated mode pair when M is different values is calculated respectively
The conversion efficiency answered；Wherein, for the integrated mode of M inverter unit of unlatching, M is calculated individual inverse
Become the power output of an inverter unit in device unit, according to the efficiency curve of inverter unit, it is determined that
Conversion efficiency V of the inverter unit under the input power and power output.
12. inverter system running gear according to claim 7, it is characterised in that the dress
Putting also includes, input power monitoring unit, the input power for monitoring inverter system, works as input work
When rate changes, combination of notifications pattern determining unit determines corresponding first group according to new input power
Syntype, and integrated mode switch element is according to the first new integrated mode, it would be desirable to the part of unlatching
Inverter unit is set to running status, and remaining inverter unit is set to off into closed state.
13. a kind of inverter system, it is characterised in that the inverter system includes N number of inverter list
Member；N is the integer more than or equal to 2；The inverter system also includes appointing in claim 7~12
The inverter system running gear of one offer.
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| CN201610149541.XA CN107204627A (en) | 2016-03-16 | 2016-03-16 | A kind of inverter system operation method and device and inverter system |
| PCT/CN2017/075203 WO2017157169A1 (en) | 2016-03-16 | 2017-02-28 | Inverter system operating method and device, and inverter system |
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