CN105515513B - A kind of photovoltaic DC-to-AC converter and its control method - Google Patents
A kind of photovoltaic DC-to-AC converter and its control method Download PDFInfo
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- CN105515513B CN105515513B CN201610073927.7A CN201610073927A CN105515513B CN 105515513 B CN105515513 B CN 105515513B CN 201610073927 A CN201610073927 A CN 201610073927A CN 105515513 B CN105515513 B CN 105515513B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004146 energy storage Methods 0.000 claims abstract description 84
- 230000005611 electricity Effects 0.000 claims description 13
- 101100112673 Rattus norvegicus Ccnd2 gene Proteins 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 229910010271 silicon carbide Inorganic materials 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000013082 photovoltaic technology Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
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- H02J3/383—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The present invention provides a kind of photovoltaic DC-to-AC converter and its control method, the inverter includes：One bus circuit and inverter circuit；Bus circuit includes：First and second booster circuits, the first and second bypass circuits and the first and second energy-storage units；The first end of first DC power supply connects the input terminal of the first end and the first booster circuit of the first bypass circuit, the second end of first DC power supply connects first end, the ground terminal of the first booster circuit, the ground terminal of the second booster circuit, the second end of first energy-storage units and the first end of second energy-storage units of the second DC power supply, and the second end of the second DC power supply connects the first end of the input terminal and the second bypass circuit of the second booster circuit.It can be seen that photo-voltaic power supply of the present invention is divided into two DC power supplies, when the output current for having at least one photovoltaic module in photo-voltaic power supply reduces, the influence of the output power to other each photovoltaic modulies is reduced, to improve the gross generation of photovoltaic DC-to-AC converter.
Description
Technical field
The present invention relates to photovoltaic technology field, more particularly, to a kind of photovoltaic DC-to-AC converter and its control method.
Background technology
In photovoltaic DC-to-AC converter, direct current energy is converted light energy by photo-voltaic power supply, and by inverter circuit by direct current
It can be converted into AC energy.Wherein, photo-voltaic power supply is usually in series by multiple photovoltaic modulies, to meet user to voltage or work(
The requirement of rate.
However, photovoltaic module is due to a variety of originals such as aging decaying, abnormal damage, hot spot, barrier block, dust influences
Cause, it may appear that the case where output current reduces.When being connected in series with due to multiple photovoltaic modulies, the output current of photo-voltaic power supply is by each
The minimum output current of a photovoltaic module determines, therefore, when the output current for having at least one photovoltaic module reduces, can influence
The output power of other concatenated each photovoltaic modulies, the gross generation for eventually leading to photovoltaic DC-to-AC converter reduce.
Invention content
Present invention solves the technical problem that be to provide a kind of photovoltaic DC-to-AC converter and its control method, to realize when having at least
When the output current of one photovoltaic module reduces, the influence to the output power of other each photovoltaic modulies is reduced, to improve
The gross generation of photovoltaic DC-to-AC converter.
For this purpose, the technical solution that the present invention solves technical problem is：
The present invention provides a kind of photovoltaic DC-to-AC converters, including：One bus circuit and inverter circuit；
The bus circuit includes：First booster circuit, the second booster circuit, the first bypass circuit, the second bypass circuit,
First energy-storage units and second energy-storage units；The first energy-storage units and the second energy-storage units respectively include at least one
Series, parallel or the energy-storage travelling wave tube of connection in series-parallel connection；
The first end of first bypass circuit connects the first DC power supply with the input terminal of first booster circuit
First end, the second end of first DC power supply connects the first end of the second DC power supply, first booster circuit connects
The of ground terminal, the ground terminal of second booster circuit, the second end of the first energy-storage units and the second energy-storage units
One end, the second end of second DC power supply connect the input terminal of second booster circuit and second bypass circuit
First end；Midpoint of the tie point of first DC power supply and second DC power supply as the bus circuit；
The output end of first booster circuit connects the second end of first bypass circuit and the first energy storage list
The first end of member, the output end of second booster circuit connect the second end of second bypass circuit and second energy storage
The second end of unit；
The output end of the output end of first booster circuit and second booster circuit is as the bus circuit
Output end, and connect the inverter circuit.
Optionally, the inverter further includes：Concatenated third energy-storage units and the 4th energy-storage units, the third energy storage
Unit and the described 4th energy-storage travelling wave tube that energy-storage units respectively include at least one series, parallel or connection in series-parallel connects；
The third of connecting between the output end of first booster circuit and the output end of second booster circuit is stored up
Energy unit and the 4th energy-storage units, the third energy-storage units connect described inverse with the tie point of the 4th energy-storage units
Become circuit, the third energy-storage units and the tie point of the 4th energy-storage units and the midpoint of the bus circuit disconnects.
Optionally, the photovoltaic DC-to-AC converter has the first operation mode；
If the photovoltaic DC-to-AC converter is operated in the first operation mode, first booster circuit and second booster circuit
Work, first bypass circuit and second bypass circuit do not work, and pass through first booster circuit and described second
Booster circuit independently carries out MPPT controls, so that first DC power supply and second DC power supply arrive separately at respectively
From maximum power point (mpp).
Optionally, the photovoltaic DC-to-AC converter also has the second operation mode and third operation mode；
If the photovoltaic DC-to-AC converter is operated in the second operation mode, first booster circuit and second booster circuit
Work, first bypass circuit and second bypass circuit do not work, and pass through first booster circuit and described second
Booster circuit integrally carries out MPPT controls, so that the series circuit of first DC power supply and second DC power supply
It is whole to reach maximum power point (mpp)；
If the photovoltaic DC-to-AC converter is operated in third operation mode, first bypass circuit and second bypass circuit
Work, first booster circuit and second booster circuit do not work, and MPPT controls are carried out by the inverter circuit, with
So that the series circuit of first DC power supply and second DC power supply integrally reaches maximum power point (mpp).
Optionally, total output voltage of first DC power supply and second DC power supply is being less than photovoltaic DC-to-AC converter just
Normal grid-connected voltage；
If the output voltage of at least one booster circuit is more than in first booster circuit and second booster circuit
Or it is equal to device threshold voltage, the photovoltaic DC-to-AC converter is operated in second operation mode；
If the output voltage of the output voltage of first booster circuit and second booster circuit is respectively less than device threshold
Threshold voltage, the photovoltaic DC-to-AC converter are operated in first operation mode.
Optionally, it is inverse to be greater than or equal to photovoltaic for total output voltage of first DC power supply and second DC power supply
Become the normal grid-connected voltage of device；
If the output voltage of at least one booster circuit is more than in first booster circuit and second booster circuit
Or it is equal to device threshold voltage, the photovoltaic DC-to-AC converter is operated in the third operation mode；
If the output voltage of the output voltage of first booster circuit and second booster circuit is respectively less than device threshold
Threshold voltage, if the first generated energy is more than the second generated energy, the photovoltaic DC-to-AC converter is operated in the first operation mode, if the first power generation
Amount is less than the second generated energy, and the photovoltaic DC-to-AC converter is operated in third operation mode, and first generated energy is that the photovoltaic is inverse
Become the generated energy of photovoltaic DC-to-AC converter when device is operated in first operation mode, second generated energy is the photovoltaic
The generated energy of photovoltaic DC-to-AC converter when inverter is operated in the third operation mode.
The present invention provides a kind of photovoltaic generating systems, including any of the above-described photovoltaic DC-to-AC converter, first DC power supply
With second DC power supply.
Optionally, further include a1+a2 DC power supply, a1 >=1, a2 >=1；Wherein a1 DC power supply and described first is directly
Power sources in parallel is flowed, in addition a2 DC power supply is in parallel with second DC power supply.
The present invention provides a kind of photovoltaic generating systems, including：S the first DC power supplies, s the second DC power supplies, s are a
Bus circuit and inverter circuit；Wherein, s ＞ 1, each bus circuit are any of the above-described bus circuit；
The output end of each bus circuit is connected and the midpoint of each bus circuit is connected；
The output end of each bus circuit connects the inverter circuit, input terminal be separately connected each first DC power supply and
Each second DC power supply.
The present invention provides a kind of control methods of photovoltaic DC-to-AC converter, are used for any of the above-described photovoltaic DC-to-AC converter, the method
Including：
It controls the photovoltaic DC-to-AC converter and is operated in the first operation mode；
Wherein, if the photovoltaic DC-to-AC converter is operated in the first operation mode, first booster circuit and second liter described
Volt circuit works, and first bypass circuit and second bypass circuit do not work, and pass through first booster circuit and institute
It states the second booster circuit and independently carries out MPPT controls, so that first DC power supply and second DC power supply difference
Reach respective maximum power point (mpp).
Optionally, the method further includes：
It controls the photovoltaic DC-to-AC converter and is operated in the second operation mode；
It controls the photovoltaic DC-to-AC converter and is operated in third operation mode；
Wherein, if the photovoltaic DC-to-AC converter is operated in the second operation mode, first booster circuit and second liter described
Volt circuit works, and first bypass circuit and second bypass circuit do not work, and pass through first booster circuit and institute
It states the second booster circuit and integrally carries out MPPT controls, so that the string of first DC power supply and second DC power supply
Connection circuit integrally reaches maximum power point (mpp)；
If the photovoltaic DC-to-AC converter is operated in third operation mode, first bypass circuit and second bypass circuit
Work, first booster circuit and second booster circuit do not work, and MPPT controls are carried out by the inverter circuit, with
So that the series circuit of first DC power supply and second DC power supply integrally reaches maximum power point (mpp).
Optionally, it controls the photovoltaic DC-to-AC converter and is operated in the first operation mode, including：
If judging, total output voltage of first DC power supply and second DC power supply is less than photovoltaic DC-to-AC converter
Normal grid-connected voltage, and the output voltage of the output voltage of first booster circuit and second booster circuit is respectively less than
Device threshold voltage controls the photovoltaic DC-to-AC converter and is operated in first operation mode；And/or
If judging, total output voltage of first DC power supply and second DC power supply is greater than or equal to photovoltaic
The output voltage of the normal grid-connected voltage of inverter, the output voltage of first booster circuit and second booster circuit is small
In device threshold voltage, and the first generated energy is more than the second generated energy, controls the photovoltaic DC-to-AC converter and is operated in the first work
Mode, wherein first generated energy is that the photovoltaic when photovoltaic DC-to-AC converter is operated in first operation mode is inverse
Become the generated energy of device, second generated energy is the photovoltaic when photovoltaic DC-to-AC converter is operated in the third operation mode
The generated energy of inverter.
Optionally, it controls the photovoltaic DC-to-AC converter and is operated in the second operation mode, including：
If judging, total output voltage of first DC power supply and second DC power supply is less than photovoltaic DC-to-AC converter
The output voltage of at least one booster circuit is big in normal grid-connected voltage, first booster circuit and second booster circuit
In or equal to device threshold voltage, controls the photovoltaic DC-to-AC converter and be operated in second operation mode.
Optionally, it controls the photovoltaic DC-to-AC converter and is operated in third operation mode, including：
If judging, total output voltage of first DC power supply and second DC power supply is greater than or equal to photovoltaic
The output of at least one booster circuit in the normal grid-connected voltage of inverter, first booster circuit and second booster circuit
Voltage is greater than or equal to device threshold voltage, controls the photovoltaic DC-to-AC converter and is operated in third operation mode；And/or
If judging, total output voltage of first DC power supply and second DC power supply is greater than or equal to photovoltaic
The output voltage of the normal grid-connected voltage of inverter, the output voltage of first booster circuit and second booster circuit is small
In device threshold voltage, and the first generated energy is less than the second generated energy, controls the photovoltaic DC-to-AC converter and is operated in third work
Mode, wherein first generated energy is that the photovoltaic when photovoltaic DC-to-AC converter is operated in first operation mode is inverse
Become the generated energy of device, second generated energy is the photovoltaic when photovoltaic DC-to-AC converter is operated in the third operation mode
The generated energy of inverter.
According to the above-mentioned technical solution, in the photovoltaic DC-to-AC converter of the embodiment of the present invention, the first bypass circuit, the second bypass
Circuit, the first booster circuit, the second booster circuit, first energy-storage units and second energy-storage units connection concatenated first are straight
Galvanic electricity source and the second DC power supply.Wherein, the first and second DC power supplies tie point connect the first booster circuit ground terminal,
The tie point of the ground terminal of second booster circuit and the first and second energy-storage units.It can be seen that photovoltaic electric in the embodiment of the present invention
Source is divided into two concatenated DC power supplies, can when the output current for having at least one photovoltaic module in photo-voltaic power supply reduces
Only to influence the output power for other each photovoltaic modulies for belonging to same DC power supply, reduce to other each photovoltaic modulies
Output power influence, to improve the gross generation of photovoltaic DC-to-AC converter.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, other attached drawings are can also be obtained according to these attached drawings.
Fig. 1 is a kind of structural schematic diagram of embodiment of photovoltaic DC-to-AC converter provided by the invention；
Fig. 2 is a kind of physical circuit of photovoltaic DC-to-AC converter provided by the invention；
Fig. 3 is a kind of structural schematic diagram of embodiment of photovoltaic generating system provided by the invention；
Fig. 4 is the structural schematic diagram of another embodiment of photovoltaic generating system provided by the invention；
Fig. 5 is a kind of flow diagram of embodiment of control method provided by the invention.
Specific implementation mode
In order to make those skilled in the art more fully understand the technical solution in the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without creative efforts, should all belong to protection of the present invention
Range.
Referring to Fig. 1, an embodiment of the present invention provides a kind of embodiments of photovoltaic DC-to-AC converter.The photovoltaic inversion of the present embodiment
Device includes：One bus circuit 10 and inverter circuit 20.
Bus circuit 10 includes：First booster circuit 103, the second booster circuit 104, by the first bypass circuit 105, second
Road circuit 106, first energy-storage units 107 and second energy-storage units 108.
Wherein, first energy-storage units 107 and second energy-storage units 108 respectively include at least one series, parallel or string simultaneously
Join the energy-storage travelling wave tube of connection, energy-storage travelling wave tube can be capacitance etc..First bypass circuit 105 and the second bypass circuit 106 can wrap
Include diode, switching device etc., wherein switching device refers to that the device with switching function, such as metal-oxide are partly led
Body field-effect transistor (MOSFET), relay (RELAY), insulated gate bipolar transistor (IGBT), gate electrode capable of switching off crystalline substance lock
Manage (GTO), silicon carbide (SIC) device (such as SIC diodes, SIC IGBT, SIC MOSFET etc.).
The first end of first bypass circuit 105 connects the first DC power supply 101 with the input terminal of the first booster circuit 103
First end, the second end of the first DC power supply 101 connects the first end of the second DC power supply 102, the first booster circuit 103 connects
The first of ground terminal, the ground terminal of the second booster circuit 104, the second end of first energy-storage units 107 and second energy-storage units 108
End, the input terminal of second end the second booster circuit 104 of connection of the second DC power supply 102 and the first of the second bypass circuit 106
End.The second end of output end the first bypass circuit 105 of connection of first booster circuit 103 and the first of first energy-storage units 107
End, the second end of output end the second bypass circuit 106 of connection of the second booster circuit 104 and the second of second energy-storage units 108
End.
Wherein, midpoint of the tie point of the first DC power supply 101 and the second DC power supply 102 as bus circuit 10；The
Output end of the output end of the output end of one booster circuit 103 and the second booster circuit 104 as bus circuit 10, and connect inverse
Become circuit 20.Wherein, the direct current energy that the output end of bus circuit 10 exports is converted into AC energy by inverter circuit 20, and
It can be supplied to AC network by filter 30.
First DC power supply 101 can respectively include at least one series connection with the second DC power supply 102 or connection in series-parallel connects
Photovoltaic module, for example, the first DC power supply 101 includes m concatenated photovoltaic modulies, the second DC power supply 102 includes n and goes here and there
The photovoltaic module of connection, m >=1, n >=1, m and n can be equal, can not also be equal.
According to the above-mentioned technical solution, in the photovoltaic DC-to-AC converter of the embodiment of the present invention, the first booster circuit 103, second
Booster circuit 104, the first bypass circuit 105, the second bypass circuit 106, first energy-storage units 107 and second energy-storage units
108 concatenated first DC power supply, 101 and second DC power supplies 102 of connection.Wherein, the first DC power supply 101 and the second direct current
The tie point of power supply 102 connects the ground terminal of the first booster circuit 103, the ground terminal of the second booster circuit 104 and the first storage
The tie point of energy unit 107 and second energy-storage units 108.It can be seen that in the embodiment of the present invention photo-voltaic power supply be divided into two it is concatenated
DC power supply, can by the first booster circuit 103 and the second booster circuit 104, independently carry out maximum power point (mpp) with
Track (Maximum Power Point Tracking, MPPT) controls, at this time when there is at least one photovoltaic module in photo-voltaic power supply
Output current reduce when, only influence belong to same DC power supply other each photovoltaic modulies output power.The present invention is real
It applies in photovoltaic DC-to-AC converter of the example especially suitable for the more photovoltaic module that needs to connect, such as in the photovoltaic DC-to-AC converter of 1500V.
For example, the first DC power supply 101 includes m concatenated photovoltaic modulies, the second DC power supply 102 includes n
It is straight only to influence second when a photovoltaic module output current in n concatenated photovoltaic modulies reduces for concatenated photovoltaic module
The output power of other n-1 photovoltaic module in galvanic electricity source 102, without influencing m photovoltaic module in the first DC power supply 101
Output power integrally all concatenated photovoltaic modulies in photo-voltaic power supply are carried out by booster circuit and in the prior art
MPPT is tracked, and when the output current of a photovoltaic module reduces, can influence the output power of other m+n-1 photovoltaic module.
As it can be seen that the embodiment of the present invention reduces the influence of the output power to other each photovoltaic modulies, it is inverse so as to improve photovoltaic
Become the gross generation of device.
In the present embodiment, photovoltaic DC-to-AC converter can also include：109 and the 4th energy-storage units of concatenated third energy-storage units
110, wherein third energy-storage units 109 and the 4th energy-storage units 110 respectively include at least one series, parallel or connection in series-parallel company
The energy-storage travelling wave tube connect.First energy-storage units 107, second energy-storage units 108, third energy-storage units 109 and the 4th energy-storage units 110
Constitute busbar energy-storage units.
Series connection third energy-storage units between the output end of first booster circuit 103 and the output end of the second booster circuit 104
109 and the 4th energy-storage units 110, third energy-storage units 109 connect inverter circuit 20 with the tie point of the 4th energy-storage units 110,
Such as the midpoint of connection inverter circuit 20.Wherein, the tie point and busbar of third energy-storage units 109 and the 4th energy-storage units 110
The midpoint of circuit 10 disconnects (being not attached to), this is because independently by the first booster circuit 103 and the second booster circuit 104
When carrying out MPPT controls, the voltage (i.e. the output voltage of the first booster circuit 103) at 107 both ends of first energy-storage units and the second storage
The voltage (i.e. the output voltage of the second booster circuit 104) at 108 both ends of energy unit is usually unequal, and third energy-storage units 109
Usually required that with the voltage at 110 both ends of the 4th energy-storage units it is equal, in order to enable the voltage at the first and second energy-storage units both ends
The voltage at the third and fourth energy-storage units both ends will not be had an impact.Therefore, third energy-storage units 109 and the 4th energy-storage units
110 tie point is disconnected with the midpoint of bus circuit 10.
In the present embodiment, the first booster circuit 103 and the second booster circuit 104 can be respectively BOOST circuits, such as scheme
Shown in 2, the first booster circuit 103 and the second booster circuit 104 constitute 3 level BOOST circuits, and the first booster circuit 103 is 3 electricity
The top half of flat BOOST circuits, the second booster circuit 104 are the lower half portion of 3 level BOOST circuits.
Wherein, the first booster circuit 103 includes inductance L1, switching tube Q1 and diode D1, the first end conduct of inductance L1
The input terminal of first booster circuit 103, the first end of the anode and switching tube Q1 of the second end connection diode D1 of inductance L1, two
Output end of the cathode of pole pipe D1 as the first booster circuit 103, the second end of switching tube Q1 is as the first booster circuit 103
Ground terminal.Second booster circuit 104 includes inductance L2, switching tube Q2 and diode D2, and wherein the first end of inductance L2 is as the
The input terminal of two booster circuits 104, the second end of the cathode and switching tube Q2 of the second end connection diode D2 of inductance L2, two poles
Output end of the anode of pipe D2 as the second booster circuit 104, first end the connecing as the second booster circuit 104 of switching tube Q2
Ground terminal.
Below by taking the physical circuit of Fig. 2 as an example, illustrate the operation mode of photovoltaic DC-to-AC converter.It should be noted that in Fig. 2 with
First booster circuit 103 and the second booster circuit 104 constitute 3 level BOOST circuits, and first energy-storage units 107 include capacitance C1,
Second energy-storage units 108 include capacitance C2, and third energy-storage units 109 include capacitance C3, and the 4th energy-storage units 110 include capacitance C4
For illustrate, these examples can't play restriction effect to the embodiment of the present invention.
The photovoltaic DC-to-AC converter of the present embodiment has the first operation mode.
If photovoltaic DC-to-AC converter is operated in the first operation mode, the work of 3 level BOOST circuits, the first bypass circuit 105 and the
Two bypass circuits 106 do not work, and MPPT controls are independently carried out by the top half and lower half portion of 3 level BOOST circuits,
That is the first DC power supply of top half pair 101 of 3 level BOOST circuits carries out MPPT controls, the lower half of 3 level BOOST circuits
Part carries out MPPT controls to the second DC power supply 102, so that the first DC power supply 101 and the second DC power supply 102 difference
Reach respective maximum power point (mpp).At this point, due to top half and lower half portion independence by 3 level BOOST circuits
Ground carries out MPPT controls, thus when in the first DC power supply 101 or the second DC power supply 102 at least one photovoltaic module it is defeated
When going out electric current reduction, the output power for belonging to other each photovoltaic modulies of same DC power supply is only influenced, so as to improve
The gross generation of photovoltaic DC-to-AC converter.
Wherein, the output voltage of the top half of 3 level BOOST circuits is Vo1 (the i.e. outputs of the first booster circuit 103
Voltage), input voltage is Vin1 (i.e. the output voltage of the first DC power supply 101), the lower half portion of 3 level BOOST circuits
Output voltage be Vo2 (i.e. the output voltage of the second booster circuit 104), input voltage for Vin2 (i.e. the second DC power supply 102
Output voltage).Vo1 and Vo2 is allocated according to the respective power of top half and lower half portion of 3 level BOOST circuits, female
Line voltage is the sum of Vo1 and Vo2.
The photovoltaic DC-to-AC converter of the present embodiment can also have the second operation mode and third operation mode.
Wherein, if photovoltaic DC-to-AC converter is operated in the second operation mode, the work of 3 level BOOST circuits, the first bypass circuit
105 and second bypass circuit 106 do not work, MPPT controls are integrally carried out by 3 level BOOST circuits, so that first straight
The series circuit of galvanic electricity source 101 and the second DC power supply 102 integrally reaches maximum power point (mpp).
If photovoltaic DC-to-AC converter is operated in third operation mode, the first bypass circuit 105 and the second bypass circuit 106 work, 3
Level BOOST circuits do not work, and MPPT controls are carried out by inverter circuit 20, so that the first DC power supply 101 and second is straight
The series circuit in galvanic electricity source 102 integrally reaches maximum power point (mpp).
The control mode of the photovoltaic DC-to-AC converter of the lower mask body embodiment of the present invention.The control mode is divided into two kinds of situations.
The first situation, when Vin1+Vin2 ＜ U, wherein Vin1+Vin2 is the first DC power supply 101 and the second direct current
Total output voltage in source 102, U are the normal grid-connected voltage of photovoltaic DC-to-AC converter, the as minimum grid-connected voltage of busbar.
(1) if Vo1 >=Vth and Vo2 ＜ Vth, the photovoltaic DC-to-AC converter are operated in second operation mode, that is, pass through 3
Level BOOST circuits integrally carry out MPPT controls.
Wherein, Vth is device threshold voltage, i.e. the maximum voltage limit value of device.For example, Vlimt is each in bus circuit
The minimum value of the rated voltage of a device, such as switching tube Q1 and Q2 in Fig. 2, diode D1 and D2, in capacitance C1 and C2
The minimum value of rated voltage, drop volume surplus when △ V are each device work in bus circuit, then Vth can be Vlimt- △
V。
As Vo1 >=Vlimt, the device in bus circuit is may be damaged, therefore, in the present embodiment in Vo1 >=Vth,
So that the photovoltaic DC-to-AC converter is operated in second operation mode and avoids device from being damaged so as to reduce Vo1.
(2) if Vo1 ＜ Vth and Vo2 >=Vth, the photovoltaic DC-to-AC converter is operated in second operation mode, that is, passes through 3
Level BOOST circuits integrally carry out MPPT controls.
As Vo2 >=Vlimt, the device in bus circuit is may be damaged, therefore, in the present embodiment in Vo2 >=Vth,
So that the photovoltaic DC-to-AC converter is operated in second operation mode and avoids device from being damaged so as to reduce Vo2.
(3) if Vo1 ＜ Vth and Vo2 ＜ Vth, the photovoltaic DC-to-AC converter are operated in the first operation mode, pass through 3 level
The top half of BOOST circuits and lower half portion independently carry out MPPT controls, when the output electricity for having at least one photovoltaic module
Stream can improve generated energy when reducing.
(4) if Vo2 >=Vth and Vo1 >=Vth, the photovoltaic DC-to-AC converter is operated in second operation mode, that is, passes through 3
Level BOOST circuits integrally carry out MPPT controls.
As Vo2 >=Vlimt, Vo2 >=Vlimt, the device in bus circuit is may be damaged, therefore, in the present embodiment
In Vo2 >=Vth, Vo1 >=Vth so that the photovoltaic DC-to-AC converter is operated in second operation mode, so as to reduce
Vo1 and Vo2, avoids device from being damaged.
The second situation, when Vin1+Vin2 >=U.
(1) if at least one voltage is greater than or equal to Vth, i.e. Vo1 >=Vth and Vo2 ＜ Vth, Vo1 ＜ in Vo1 and Vo2
Vth and Vo2 >=Vth, alternatively, Vo1 >=Vth and Vo2 >=Vth, the photovoltaic DC-to-AC converter is operated in the third operation mode, i.e.,
Powered directly to inverter circuit 20 by the first bypass circuit 105 and the second bypass circuit 106, and by inverter circuit 20 into
Row MPPT controls.
(2) it if Vo1 ＜ Vth and Vo2 ＜ Vth, needs to be judged using the first operation mode still according to generated energy at this time
The third operation mode, Specific Principles are using the high operation mode of generated energy.
Specifically, the generated energy of photovoltaic DC-to-AC converter when photovoltaic DC-to-AC converter is operated in the first operation mode is the first power generation
The generated energy of photovoltaic DC-to-AC converter when amount, photovoltaic DC-to-AC converter are operated in the third operation mode is the second generated energy, passes through software
Etc. modes judge the magnitude relationship of the first generated energy and the second generated energy, if the first generated energy is more than the second generated energy, photovoltaic
Inverter is operated in the first operation mode, i.e., is independently carried out by the top half and lower half portion of 3 level BOOST circuits
MPPT is controlled；If the second generated energy is more than the first generated energy, photovoltaic DC-to-AC converter is operated in third operation mode, that is, passes through inversion
Circuit 20 carries out MPPT controls.
The embodiment of the present invention additionally provides a kind of embodiment of photovoltaic generating system.The photovoltaic generating system packet of the present embodiment
Any of the above-described embodiment for including photovoltaic DC-to-AC converter further includes the first DC power supply 101 and the second DC power supply 102.
Can also include (a1+a2) a DC power supply, respectively as shown in figure 3, in the photovoltaic generating system of the embodiment of the present invention
The photovoltaic module that a DC power supply respectively includes at least one series connection or goes here and there and connect, a1 >=1, a2 >=1, a1 and a2 can phases
Deng can not also be equal；Wherein a1 DC power supply is in parallel with the first DC power supply 101, in addition a2 DC power supply and second
DC power supply 102 is in parallel.
Wherein, it in the first operation mode, is independently carried out by the first booster circuit 103 and the second booster circuit 104
MPPT is controlled, so that first DC power supply 101 and each DC power supply in parallel with the first DC power supply 101 are whole
Maximum power point (mpp) is reached, and makes second DC power supply 102 and in parallel with the second DC power supply 102 each
DC power supply integrally reaches maximum power point (mpp).
In the second operation mode, MPPT controls are integrally carried out by the first booster circuit and the second booster circuit, with
So that the first DC power supply 101, the second DC power supply 102 and (a1+a2) a DC power supply integrally reach maximum power output
Point.
As shown in figure 4, the present embodiment additionally provides another embodiment of photovoltaic generating system.The photovoltaic of the present embodiment is sent out
Electric system includes s the first DC power supplies 101, s the second DC power supplies 102, s bus circuit and inverter circuit 20.S ＞
1。
Wherein, each bus circuit is any of the above-described bus circuit provided in an embodiment of the present invention, and operating mode
It is also identical as the operating mode of any of the above-described bus circuit, it is no longer superfluous here referring specifically to the related place of above-described embodiment
It states.
The output end of each bus circuit of the present embodiment is connected, and is all connected with inverter circuit 20；And each busbar electricity
The midpoint on road is connected；The input terminal of each bus circuit is separately connected 101 and second DC power supply of each first DC power supply
102。
Referring to Fig. 5, the embodiment of the present invention additionally provides a kind of embodiment of the control method of photovoltaic DC-to-AC converter, this implementation
Example is in any photovoltaic DC-to-AC converters of Fig. 1 to Fig. 3.
The present embodiment the method includes：
S501：Control photovoltaic DC-to-AC converter is operated in the first operation mode.
Wherein, if photovoltaic DC-to-AC converter is operated in the first operation mode, the first booster circuit 103 and the second booster circuit 104
Work, the first bypass circuit 105 and the second bypass circuit 106 do not work, and pass through the first booster circuit 103 and the second booster circuit
104 independently carry out MPPT controls so that the first DC power supply 101 and the second DC power supply 102 arrive separately at it is respective most
High-power output point.
The method can also include：
Control photovoltaic DC-to-AC converter is operated in the second operation mode；
Control photovoltaic DC-to-AC converter is operated in third operation mode.
Wherein, if photovoltaic DC-to-AC converter is operated in the second operation mode, the first booster circuit 103 and the second booster circuit 104
Work, the first bypass circuit 105 and the second bypass circuit 106 do not work, and pass through the first booster circuit 103 and the second booster circuit
104 integrally carry out MPPT controls, so that the series circuit of the first DC power supply 101 and the second DC power supply 102 integrally arrives
Up to maximum power point (mpp).
If photovoltaic DC-to-AC converter is operated in third operation mode, the first bypass circuit 105 and the work of the second bypass circuit 106,
First booster circuit 103 and the second booster circuit 104 do not work, and MPPT controls are carried out by inverter circuit 20, so that first
The series circuit of DC power supply 101 and the second DC power supply 102 integrally reaches maximum power point (mpp).
Optionally, control photovoltaic DC-to-AC converter is operated in the first operation mode, including：
If judging Vin1+Vin2 ＜ U, and Vo1 ＜ Vth and Vo2 ＜ Vth, control photovoltaic DC-to-AC converter is operated in first
Operation mode；And/or
If judging Vin1+Vin2 >=U, Vo1 ＜ Vth and Vo2 ＜ Vth, and the first generated energy is more than the second generated energy,
Control photovoltaic DC-to-AC converter is operated in the first operation mode, wherein the first generated energy is that photovoltaic DC-to-AC converter is operated in the first Working mould
The generated energy of photovoltaic DC-to-AC converter when state, the second generated energy are photovoltaic inversion when photovoltaic DC-to-AC converter is operated in third operation mode
The generated energy of device.
Optionally, control photovoltaic DC-to-AC converter is operated in the second operation mode, including：
If judging Vin1+Vin2 ＜ U, and at least one liter in the first booster circuit 103 and the second booster circuit 104
Output voltage >=Vth of volt circuit, i.e. Vo1 >=Vth and Vo2 ＜ Vth, Vo1 ＜ Vth and Vo2 >=Vth, alternatively, Vo1 >=Vth and
Vo2 >=Vth controls the photovoltaic DC-to-AC converter and is operated in second operation mode.
Optionally, control photovoltaic DC-to-AC converter is operated in third operation mode, including：
If judging Vin1+Vin2 >=U, at least one boosting electricity in the first booster circuit 103 and the second booster circuit 104
Output voltage >=the Vth on road controls the photovoltaic DC-to-AC converter and is operated in third operation mode；And/or
If judging Vin1+Vin2 >=U, Vo1 ＜ Vth and Vo2 ＜ Vth, and the first generated energy is less than the second generated energy,
It controls the photovoltaic DC-to-AC converter and is operated in third operation mode.Wherein, first generated energy works for the photovoltaic DC-to-AC converter
The generated energy of the photovoltaic DC-to-AC converter in first operation mode, second generated energy are the photovoltaic DC-to-AC converter work
Make the generated energy of the photovoltaic DC-to-AC converter in the third operation mode.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided by the present invention, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be the indirect coupling by some interfaces, device or unit
It closes or communicates to connect, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can be stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the present invention
Portion or part steps.And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Stating embodiment, invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to preceding
The technical solution recorded in each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
Modification or replacement, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (11)
1. a kind of photovoltaic DC-to-AC converter, which is characterized in that including：One bus circuit and inverter circuit；
The bus circuit includes：First booster circuit, the second booster circuit, the first bypass circuit, the second bypass circuit, first
Energy-storage units and second energy-storage units；The first energy-storage units and the second energy-storage units respectively include at least one string
The energy-storage travelling wave tube that connection, in parallel or connection in series-parallel connect；
The first end of first bypass circuit connects the first of the first DC power supply with the input terminal of first booster circuit
End, the second end of first DC power supply connect the first end of the second DC power supply, first booster circuit ground terminal,
The first end of the ground terminal of second booster circuit, the second end and the second energy-storage units of the first energy-storage units,
The second end of second DC power supply connect second booster circuit input terminal and second bypass circuit first
End；Midpoint of the tie point of first DC power supply and second DC power supply as the bus circuit；
The output end of first booster circuit connects the second end of first bypass circuit and the first energy-storage units
The output end of first end, second booster circuit connects the second end of second bypass circuit and the second energy-storage units
Second end；
Output of the output end of the output end of first booster circuit and second booster circuit as the bus circuit
End, and connect the inverter circuit；
Wherein, first DC power supply and second DC power supply are connected in series with, first DC power supply and described
Two DC power supplies respectively include the photovoltaic module of at least one series connection or connection in series-parallel connection, first DC power supply and described the
Two DC power supplies independently carry out maximum power point (mpp) by first booster circuit and second booster circuit respectively
Tracing control；
The photovoltaic DC-to-AC converter has the first operation mode；
If the photovoltaic DC-to-AC converter is operated in the first operation mode, first booster circuit and the second booster circuit work
Make, first bypass circuit and second bypass circuit do not work, by first booster circuit and second liter described
Volt circuit independently carries out MPPT controls, so that first DC power supply and second DC power supply arrive separately at respectively
Maximum power point (mpp)；
The photovoltaic DC-to-AC converter also has the second operation mode and third operation mode；
If the photovoltaic DC-to-AC converter is operated in the second operation mode, first booster circuit and the second booster circuit work
Make, first bypass circuit and second bypass circuit do not work, by first booster circuit and second liter described
Volt circuit integrally carries out MPPT controls, so that the series circuit of first DC power supply and second DC power supply is whole
Body reaches maximum power point (mpp)；
If the photovoltaic DC-to-AC converter is operated in third operation mode, first bypass circuit and the second bypass circuit work
To make, first booster circuit and second booster circuit do not work, and MPPT controls are carried out by the inverter circuit, so that
The series circuit for obtaining first DC power supply and second DC power supply integrally reaches maximum power point (mpp).
2. photovoltaic DC-to-AC converter according to claim 1, which is characterized in that the inverter further includes：Concatenated third storage
Can unit and the 4th energy-storage units, the third energy-storage units and the 4th energy-storage units respectively include at least one series connection,
The energy-storage travelling wave tube of in parallel or connection in series-parallel connection；
It connects between the output end of first booster circuit and the output end of second booster circuit third energy storage list
First and described 4th energy-storage units, the third energy-storage units and the tie point of the 4th energy-storage units connect the inversion electricity
The tie point of road, the third energy-storage units and the 4th energy-storage units is disconnected with the midpoint of the bus circuit.
3. photovoltaic DC-to-AC converter according to claim 1, which is characterized in that first DC power supply and second direct current
Total output voltage of power supply is less than the normal grid-connected voltage of photovoltaic DC-to-AC converter；
If the output voltage of at least one booster circuit is more than or waits in first booster circuit and second booster circuit
In device threshold voltage, the photovoltaic DC-to-AC converter is operated in second operation mode；
If the output voltage of the output voltage of first booster circuit and second booster circuit is respectively less than device threshold electricity
Pressure, the photovoltaic DC-to-AC converter are operated in first operation mode.
4. photovoltaic DC-to-AC converter according to claim 1, which is characterized in that first DC power supply and second direct current
Total output voltage of power supply is greater than or equal to the normal grid-connected voltage of photovoltaic DC-to-AC converter；
If the output voltage of at least one booster circuit is more than or waits in first booster circuit and second booster circuit
In device threshold voltage, the photovoltaic DC-to-AC converter is operated in the third operation mode；
If the output voltage of the output voltage of first booster circuit and second booster circuit is respectively less than device threshold electricity
Pressure, if the first generated energy is more than the second generated energy, the photovoltaic DC-to-AC converter is operated in the first operation mode, if the first generated energy is small
In the second generated energy, the photovoltaic DC-to-AC converter is operated in third operation mode, and first generated energy is the photovoltaic DC-to-AC converter
The generated energy of photovoltaic DC-to-AC converter when being operated in first operation mode, second generated energy are the photovoltaic inversion
The generated energy of photovoltaic DC-to-AC converter when device is operated in the third operation mode.
5. a kind of photovoltaic generating system, which is characterized in that including such as Claims 1-4 any one of them photovoltaic DC-to-AC converter, institute
State the first DC power supply and second DC power supply.
6. photovoltaic generating system according to claim 5, which is characterized in that further include a1+a2 DC power supply, a1 >=1,
a2≥1；Wherein a1 DC power supply is in parallel with first DC power supply, in addition a2 DC power supply and second direct current
Source is in parallel.
7. a kind of photovoltaic generating system, which is characterized in that including：S the first DC power supplies, s the second DC power supplies, s mother
Line circuit and inverter circuit；Wherein, s ＞ 1, each bus circuit are such as Claims 1-4 any one of them bus circuit；
The output end of each bus circuit is connected and the midpoint of each bus circuit is connected；
The output end of each bus circuit connects the inverter circuit, and input terminal is separately connected each first DC power supply and each
Second DC power supply.
8. a kind of control method of photovoltaic DC-to-AC converter, which is characterized in that it is used for photovoltaic DC-to-AC converter as claimed in claim 1 or 2,
The method includes：
It controls the photovoltaic DC-to-AC converter and is operated in the first operation mode；
Wherein, if the photovoltaic DC-to-AC converter is operated in the first operation mode, first booster circuit and the second boosting electricity
Road works, and first bypass circuit and second bypass circuit do not work, and passes through first booster circuit and described the
Two booster circuits independently carry out MPPT controls, so that first DC power supply and second DC power supply arrive separately at
Respective maximum power point (mpp)；
It controls the photovoltaic DC-to-AC converter and is operated in the second operation mode；
It controls the photovoltaic DC-to-AC converter and is operated in third operation mode；
Wherein, if the photovoltaic DC-to-AC converter is operated in the second operation mode, first booster circuit and the second boosting electricity
Road works, and first bypass circuit and second bypass circuit do not work, and passes through first booster circuit and described the
Two booster circuits integrally carry out MPPT controls, so that the series electrical of first DC power supply and second DC power supply
Road integrally reaches maximum power point (mpp)；
If the photovoltaic DC-to-AC converter is operated in third operation mode, first bypass circuit and the second bypass circuit work
To make, first booster circuit and second booster circuit do not work, and MPPT controls are carried out by the inverter circuit, so that
The series circuit for obtaining first DC power supply and second DC power supply integrally reaches maximum power point (mpp).
9. according to the method described in claim 8, it is characterized in that, controlling the photovoltaic DC-to-AC converter is operated in the first Working mould
State, including：
If judging, total output voltage of first DC power supply and second DC power supply is normal less than photovoltaic DC-to-AC converter
Grid-connected voltage, and the output voltage of the output voltage of first booster circuit and second booster circuit is respectively less than device
Threshold voltage controls the photovoltaic DC-to-AC converter and is operated in first operation mode；And/or
If judging, total output voltage of first DC power supply and second DC power supply is greater than or equal to photovoltaic inversion
The output voltage of the normal grid-connected voltage of device, the output voltage of first booster circuit and second booster circuit is respectively less than device
Part threshold voltage, and the first generated energy is more than the second generated energy, controls the photovoltaic DC-to-AC converter and is operated in the first operation mode,
Wherein, first generated energy is the photovoltaic DC-to-AC converter when photovoltaic DC-to-AC converter is operated in first operation mode
Generated energy, second generated energy are the photovoltaic DC-to-AC converter when photovoltaic DC-to-AC converter is operated in the third operation mode
Generated energy.
10. according to the method described in claim 8, it is characterized in that, controlling the photovoltaic DC-to-AC converter is operated in the second Working mould
State, including：
If judging, total output voltage of first DC power supply and second DC power supply is normal less than photovoltaic DC-to-AC converter
In grid-connected voltage, first booster circuit and second booster circuit output voltage of at least one booster circuit be more than or
Equal to device threshold voltage, controls the photovoltaic DC-to-AC converter and be operated in second operation mode.
11. according to the method described in claim 8, it is characterized in that, controlling the photovoltaic DC-to-AC converter is operated in third Working mould
State, including：
If judging, total output voltage of first DC power supply and second DC power supply is greater than or equal to photovoltaic inversion
The output voltage of at least one booster circuit in the normal grid-connected voltage of device, first booster circuit and second booster circuit
More than or equal to device threshold voltage, controls the photovoltaic DC-to-AC converter and be operated in third operation mode；And/or
If judging, total output voltage of first DC power supply and second DC power supply is greater than or equal to photovoltaic inversion
The output voltage of the normal grid-connected voltage of device, the output voltage of first booster circuit and second booster circuit is respectively less than device
Part threshold voltage, and the first generated energy is less than the second generated energy, controls the photovoltaic DC-to-AC converter and is operated in third operation mode,
Wherein, first generated energy is the photovoltaic DC-to-AC converter when photovoltaic DC-to-AC converter is operated in first operation mode
Generated energy, second generated energy are the photovoltaic DC-to-AC converter when photovoltaic DC-to-AC converter is operated in the third operation mode
Generated energy.
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| CN107425811B (en) * | 2017-08-23 | 2019-09-13 | 华为数字技术（苏州）有限公司 | The monitoring device and photovoltaic generating system of photovoltaic module |
| CN109254616B (en) * | 2018-10-10 | 2020-07-07 | 阳光电源股份有限公司 | Input power control method and photovoltaic inverter |
| CN110098730A (en) * | 2019-06-11 | 2019-08-06 | 阳光电源股份有限公司 | A kind of three-level Boost converter, control method and photovoltaic system |
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| EP3726688A1 (en) * | 2011-07-14 | 2020-10-21 | Solaredge Technologies Ltd. | Distributed power harvesting systems using dc power sources |
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| CN103825548B (en) * | 2014-03-05 | 2017-06-06 | 中国华能集团清洁能源技术研究院有限公司 | efficient photovoltaic module and photovoltaic generating system |
| CN104377827B (en) * | 2014-11-21 | 2017-03-01 | 南车株洲电力机车研究所有限公司 | A kind of photovoltaic DC power supply |
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