CN106452285B - A kind of photovoltaic control device and system - Google Patents
A kind of photovoltaic control device and system Download PDFInfo
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- CN106452285B CN106452285B CN201611147506.0A CN201611147506A CN106452285B CN 106452285 B CN106452285 B CN 106452285B CN 201611147506 A CN201611147506 A CN 201611147506A CN 106452285 B CN106452285 B CN 106452285B
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- 239000003990 capacitor Substances 0.000 claims description 102
- 230000002457 bidirectional effect Effects 0.000 claims description 8
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- 238000000034 method Methods 0.000 description 2
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- 239000012141 concentrate Substances 0.000 description 1
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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
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
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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
- H02S40/30—Electrical components
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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
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Abstract
The embodiment of the invention discloses a kind of photovoltaic control device and systems, device includes: the first port of the cathode of the first dcdc converter the first photovoltaic group string of reserved connection, the third port for connecting the second port of the output negative pole of the device and for connecting the second photovoltaic group string；The first port and second port of first dcdc converter are respectively the output cathode and output negative pole of the first dcdc converter；The anode of first photovoltaic group string connects the output cathode of the device；The first port of the reserved output cathode for connecting the device of second dcdc converter, for connecting the second port of the anode of the second photovoltaic group string and the third port of the cathode for connecting the first photovoltaic group string；The first port and second port of second dcdc converter are respectively the output cathode and output negative pole of the second dcdc converter；The cathode of second photovoltaic group string connects the output negative pole of the device.It can be improved the working efficiency of system, reduce loss.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation more particularly to a kind of photovoltaic control device and systems.
Background technique
Traditional string type photovoltaic generating system mostly uses greatly two-stage type topological, i.e., the first order is Boost circuit, the
Second level is inverter circuit.The maximum power optimizing of photovoltaic module is done by first order Boost circuit.
Traditional centralized photovoltaic DC-to-AC converter mostly uses greatly single stage type topological, i.e., photovoltaic module is united after combining in series and parallel
One is pooled to the DC side of centralized inverter, and uniformly does maximum power optimizing function.In this case generally DCDC is become
Parallel operation and photovoltaic module concentrate in together.
The popularization of promotion and massif power station however as photovoltaic module voltage class, photovoltaic module connect mismatch it is general
Rate is increasing.Traditional string type photovoltaic generating system and centralized photovoltaic generating system not can effectively solve photovoltaic module
The problem of mismatch of connecting.
Summary of the invention
In order to solve the above technical problem existing in the prior art, the present invention provides a kind of photovoltaic control device and is
System can be improved the working efficiency of system, reduce loss.
The embodiment of the present invention provides a kind of photovoltaic control device, comprising: following at least two dcdc converter: the first DCDC
Converter and the second dcdc converter；
The first port of the cathode of first dcdc converter the first photovoltaic group string of reserved connection, for connecting the device
Output negative pole second port and third port for connecting the second photovoltaic group string；The output of first dcdc converter
Anode and output negative pole are separately connected the first port and second port of the first dcdc converter；The first photovoltaic group string is just
Pole connects the output cathode of the device；
The first port of the reserved output cathode for connecting the device of second dcdc converter, for connecting the second photovoltaic
The second port of the anode of group string and the third port of the cathode for connecting the first photovoltaic group string；2nd DCDC becomes
The output cathode and output negative pole of parallel operation are separately connected the first port and second port of the second dcdc converter；Second light
The cathode of volt group string connects the output negative pole of the device.
Preferably, further includes: controller；
The controller, for carrying out maximum power tracing control to the first photovoltaic group string and the second photovoltaic group string, when sentencing
When the output voltage of the first photovoltaic group string of breaking needs to change, the output voltage variation of first dcdc converter is controlled,
Voltage between the output cathode and output negative pole of the device is within a predetermined range；When the output for judging the second photovoltaic group string
When voltage needs to change, the output voltage variation of second dcdc converter is controlled, the output cathode of the device and output are negative
Voltage between pole is within a predetermined range.
Preferably, first dcdc converter and the second dcdc converter are bidirectional DC/DC converter.
Preferably, second dcdc converter includes: first switch tube, second switch, third switching tube, the 4th opens
Guan Guan, first capacitor, the second capacitor and the first inductance；
The first end of the first switch tube connects the input anode of second dcdc converter, the first switch tube
Second end the input cathode of second dcdc converter is connected by the second switch；
The first end of the third switching tube connects the output cathode of second dcdc converter, the third switching tube
Second end the output negative pole of second dcdc converter is connected by the 4th switching tube；
One end of first inductance connects the second end of the first switch tube, the other end connection of first inductance
The second end of the third switching tube；
The first capacitor is connected in parallel on the input of the input anode and the second dcdc converter of second dcdc converter
Between cathode, second capacitor is connected in parallel on the output of the output cathode and the second dcdc converter of second dcdc converter
Between cathode；
The input anode and output cathode of second dcdc converter interconnect；
First dcdc converter includes: the 11st switching tube, the 12nd switching tube, the 13rd switching tube, the 14th
Switching tube, the 11st capacitor, the 12nd capacitor and the 11st inductance；
The first end of 11st switching tube connects the output cathode of first dcdc converter, and the described 11st opens
The second end for closing pipe connects the output negative pole of first dcdc converter by the 12nd switching tube；
The first end of 13rd switching tube connects the input anode of first dcdc converter, and the described 13rd opens
The second end for closing pipe connects the input cathode of first dcdc converter, the 11st electricity by the 14th switching tube
The both ends of sense are separately connected the second end of the 13rd switching tube and the second end of the 11st switching tube, the 12nd capacitor
Both ends be separately connected first dcdc converter input anode and input cathode；
The both ends of 11st capacitor are separately connected the output cathode and output negative pole of first dcdc converter；
The input cathode and output negative pole of first dcdc converter interconnect.
Preferably, first dcdc converter and the second dcdc converter are boost DC-DC converter.
Preferably, second dcdc converter include: first diode, third capacitor, the 4th capacitor, the second inductance and
5th switching tube；
The first end of the third capacitor connects the input anode of second dcdc converter, and the of the third capacitor
Two ends connect the input cathode of second dcdc converter；
The first end of 5th switching tube connects the input anode of second dcdc converter, the 5th switching tube
Second end connect the cathode of the first diode, the anode of the first diode connects second dcdc converter
Output negative pole；
One end of second inductance connects the second end of the third capacitor, and the other end of second inductance connects institute
State the cathode of first diode；
The first end of 4th capacitor connects the output cathode of second dcdc converter, and the of the 4th capacitor
Two ends connect the output negative pole of second dcdc converter；
The input anode and output cathode of second dcdc converter interconnect；
First dcdc converter includes: the second diode, the 5th capacitor, the 6th capacitor, third inductance, the 6th switch
Pipe；
The first end of 5th capacitor connects the output cathode of first dcdc converter, and the of the 5th capacitor
Two ends connect the output negative pole of first dcdc converter；
The first end of 6th switching tube connects the anode of second diode, and the cathode of second diode connects
The first end of the 5th capacitor is connect, the input that the second end of the 6th switching tube connects first dcdc converter is negative
Pole；
The first end of the third inductance connects the input anode of first dcdc converter, and the of the third inductance
Two ends connect the anode of second diode；
The both ends of 6th capacitor are separately connected the input anode and input cathode of first dcdc converter；
The input cathode and output negative pole of first dcdc converter interconnect.
Preferably, first dcdc converter and the second dcdc converter are buck DC/DC converter.
Preferably, second dcdc converter include: the 7th capacitor, the 8th capacitor, the 4th inductance, third diode and
7th switching tube；
The first end of 7th capacitor connects the input anode of second dcdc converter, and the of the 7th capacitor
Two ends connect the input cathode of second dcdc converter；
The cathode of the third diode connects the input anode of second dcdc converter, the third diode
Anode connects the input cathode of second dcdc converter by the 7th switching tube；
The first end of 8th capacitor connects the output cathode of second dcdc converter, and the of the 8th capacitor
Two ends connect the output negative pole of second dcdc converter；
The first end of 4th inductance connects the anode of the third diode, the second end connection of the 4th inductance
The output negative pole of second dcdc converter；
The input anode and output cathode of second dcdc converter interconnect；
First dcdc converter includes: that the 9th capacitor, the tenth capacitor, the 4th diode, the 5th inductance and the 8th are opened
Guan Guan；
The first end of 9th capacitor connects the output cathode of first dcdc converter, and the of the 9th capacitor
Two ends connect the output negative pole of first dcdc converter；
The first end of 8th switching tube connects the input anode of first dcdc converter, the 8th switching tube
Second end connect the cathode of the 4th diode, the anode of the 4th diode connects first dcdc converter
Input cathode；
The first end of 5th inductance connects the cathode of the 4th diode, the second end connection of the 5th inductance
The output cathode of first dcdc converter；
The both ends of tenth capacitor are separately connected the input anode and input cathode of first dcdc converter；
The input cathode and output negative pole of first dcdc converter interconnect.
Preferably, further includes: the 5th switching device and the 6th switching device；
The output cathode of first dcdc converter connects the first end of the 5th switching device, the 5th switch
The second end of device connects the first port of the first dcdc converter；Described in the output negative pole connection of second dcdc converter
The first end of the second end of 6th switching device, the 6th switching device connects the second end of second dcdc converter
Mouthful；
Or,
The first end of 5th switching device connects the third port of first dcdc converter, the 5th switch
The second end of device connects the input anode of first dcdc converter；The anode connection described the of 6th switching device
The second end of the input cathode of two dcdc converters, the 6th switching device connects the third end of second dcdc converter
Mouthful.
The embodiment of the present invention also provides a kind of photovoltaic control device, comprising: following at least two dcdc converter: first
Dcdc converter and the second dcdc converter；The corresponding first photovoltaic group string of first dcdc converter, the 2nd DCDC become
Parallel operation corresponds to the second photovoltaic group string；
The anode of the first photovoltaic group string connects the output cathode of the device, and the cathode of the first photovoltaic group string connects first
The output negative pole of the output cathode of DC/DC converter, the first DC/DC converter connects the output negative pole of the device；
The cathode of the second photovoltaic group string connects the output negative pole of the device, and the anode of the second photovoltaic group string connects
The output cathode of the output negative pole of two DC/DC converters, the 2nd DC/DC converter connects the output cathode of the device；
The input anode of the first DC/DC converter is connected with the anode of the second photovoltaic group string, the first DC/DC
The input cathode of converter is connected with the cathode of the second photovoltaic group string；The input anode of the 2nd DC/DC converter and
The anode of one photovoltaic group string is connected, and the input cathode of the 2nd DC/DC converter is connected with the cathode of the first photovoltaic group string
It connects.
The embodiment of the present invention also provides a kind of photovoltaic control system, including the photovoltaic control device described at least one, also
It include: inverter；
The input anode of the inverter connects the output cathode of the photovoltaic control device, and the input of the inverter is negative
Pole connects the output negative pole of the photovoltaic control device；
The inverter, the voltage between output cathode and output negative pole for controlling the photovoltaic control device is pre-
Determine in range.
Preferably, when the system includes multiple described photovoltaic control devices, further includes: at least one header box；
When the header box is one, the output cathode of all photovoltaic control devices is connecting the input of the header box just
Pole, the output negative pole of all photovoltaic control devices connect the input cathode of the header box, and the output cathode of the header box connects
The input anode of the inverter is connect, the output negative pole of the header box connects the input cathode of the inverter；
When the number of the header box is equal with the number of photovoltaic control device, each photovoltaic control device output cathode
The input anode of the header box is connected, the output negative pole of each photovoltaic control device connects the input cathode of the header box,
The output cathode of all header boxs connects the input anode of the inverter, and the output negative pole of all header boxs connects the inversion
The input cathode of device；
When the number of the header box is less than the number of the photovoltaic control device, the output of multiple photovoltaic control devices
Anode connects the input anode an of header box, and the input that the output negative pole of multiple photovoltaic control devices connects a header box is negative
Pole, the input that the output cathode of all header boxs connects the inverter is positive, described in the output negative pole connection of all header boxs
The input cathode of inverter.
Compared with prior art, the present invention has at least the following advantages:
Photovoltaic group string and dcdc converter are connected, be can control concatenated by photovoltaic control device provided in this embodiment
The output voltage of dcdc converter adjusts the output voltage of photovoltaic group string, can also pass through and adjusts dcdc converter in parallel
Output voltage adjusts the output voltage of photovoltaic module, in this way loses string type photovoltaic system and the series connection of centralized photovoltaic system
It is addressed with problem.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is one schematic diagram of photovoltaic control device embodiment provided by the invention；
Fig. 2 is two schematic diagram of photovoltaic control device embodiment provided by the invention；
Fig. 3 is three schematic diagram of photovoltaic control device embodiment provided by the invention；
Fig. 4 is photovoltaic control device example IV schematic diagram provided by the invention；
Fig. 5 a is the first connected mode schematic diagram of two diodes of D5 provided by the invention and D6；
Fig. 5 b is second of connected mode schematic diagram of two diodes of D5 provided by the invention and D6；
Fig. 5 c is the third connected mode schematic diagram of two diodes of D5 provided by the invention and D6；
Fig. 6 is the schematic diagram of photovoltaic control system embodiment provided by the invention.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only this
Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Referring to Fig. 1, which is one schematic diagram of photovoltaic control device embodiment provided by the invention.
Photovoltaic control device provided in this embodiment, comprising: following at least two dcdc converter: the first dcdc converter
103 and second dcdc converter 104；
The first port of the cathode of first dcdc converter 103 the first photovoltaic group string 101 of reserved connection, for connecting
The second port of the output negative pole of the device and third port for connecting the second photovoltaic group string 102；First DCDC becomes
The output cathode and output negative pole of parallel operation 103 are separately connected the first port and second port of the first dcdc converter 103；It is described
The anode of first photovoltaic group string 101 connects the output cathode of the device；
The first port of the reserved output cathode for connecting the device of second dcdc converter 104, for connecting second
The second port of the anode of photovoltaic group string 102 and the third port of the cathode for connecting the first photovoltaic group string 101；It is described
The output cathode and output negative pole of second dcdc converter 104 are separately connected the first port and of the second dcdc converter 104
Two-port netwerk；The cathode of the second photovoltaic group string 102 connects the output negative pole of the device.
It should be noted that photovoltaic group string includes at least a photovoltaic module, and when including multiple photovoltaic modulies, Ke Yiwei
The series, parallel of photovoltaic module is series-parallel.
It should be noted that in photovoltaic generating system, it may include multiple photovoltaic group strings, for side in the embodiment of the present invention
Just understand, be introduced by taking two photovoltaic group strings as an example.It is understood that when including multiple photovoltaic group strings, working principle
Identical when with two photovoltaic group strings, details are not described herein.
Photovoltaic group string and dcdc converter are connected, be can control concatenated by photovoltaic control device provided in this embodiment
The output voltage of dcdc converter adjusts the output voltage of photovoltaic group string, can also pass through and adjusts dcdc converter in parallel
Output voltage adjusts the output voltage of photovoltaic module, in this way loses string type photovoltaic system and the series connection of centralized photovoltaic system
It is addressed with problem.
It can also include: controller in another photovoltaic control device provided in an embodiment of the present invention；
The controller, for carrying out maximum power tracing control to the first photovoltaic group string 101 and the second photovoltaic group string 102
System controls first dcdc converter 103 when the output voltage for judging the first photovoltaic group string 101 needs to change
Output voltage variation, so that the voltage between the output cathode 105 and output negative pole 106 of the device is within a predetermined range；When sentencing
When the output voltage of the second photovoltaic group string 102 of breaking needs to change, the output voltage of second dcdc converter 104 is controlled
Variation, so that the voltage between the output cathode 105 and output negative pole 106 of the device is within a predetermined range.
It should be noted that the output end of the device connects inverter, inverter can control the output cathode of the device
Voltage needs between 105 and output negative pole 106 immobilize.Alternatively, approximation immobilizes, i.e., in the predetermined model of acceptable
Enclose interior fluctuation.
Device provided in this embodiment connects photovoltaic group string and dcdc converter, if the output voltage of photovoltaic group string
Need to increase, due to the total voltage after the two series connection be it is fixed, can pass through reduces the defeated of concatenated dcdc converter
Voltage can be such that the output voltage of photovoltaic group string passively increases out.And it can use the photovoltaic group string of other strings to the string
Dcdc converter provides power supply.Intersect i.e. between photovoltaic group string is that concatenated dcdc converter is powered, it is not necessary to which additional connection is independent
Power supply.Cost is saved in this way, and the output voltage by controlling dcdc converter realizes maximal power tracing come indirect
Control, can effectively solve the problems, such as tandem photovoltaic group string mismatch.
It, can also be with it is understood that it can be identical structure that two photovoltaic group strings, which distinguish concatenated dcdc converters,
For different structures.When the type of the first dcdc converter and the second dcdc converter is identical, controller is easy to implement control.
Referring to fig. 2, which is two schematic diagram of photovoltaic control device embodiment provided by the invention.
It is introduced so that two dcdc converters are bidirectional DC/DC converter as an example in the present embodiment, it is possible to understand that
It is that bidirectional DC/DC converter refers to the dcdc converter that not only may be implemented to boost but also may be implemented decompression.
Photovoltaic control device provided in this embodiment, second dcdc converter include: first switch tube Q1, second open
Close pipe Q2, third switching tube Q3, the 4th switching tube Q4, first capacitor C1, the second capacitor C2 and the first inductance L1；
The first end of the first switch tube Q1 connects the input anode of second dcdc converter, the first switch tube
The second end of Q1 connects the input cathode of second dcdc converter by the second switch Q2；
The first end of the third switching tube Q3 connects the output cathode of second dcdc converter, the third switching tube
The second end of Q3 connects the output negative pole of second dcdc converter by the 4th switching tube Q4；
One end of the first inductance L1 connects the second end of the first switch tube Q1, and the first inductance L1's is another
End connects the second end of the third switching tube Q3；
The first capacitor C1 is connected in parallel on the input of the input anode and the second dcdc converter of second dcdc converter
Between cathode, the second capacitor C2 is connected in parallel on the output of the output cathode and the second dcdc converter of second dcdc converter
Between cathode；
The input anode and output cathode of second dcdc converter interconnect.
First dcdc converter includes: the 11st switching tube Q11, the 12nd switching tube Q12, the 13rd switching tube
Q13, the 14th switching tube Q14, the 11st capacitor C11, the 12nd capacitor C12 and the 11st inductance L11；
The first end of the 11st switching tube Q11 connects the output cathode of first dcdc converter, and the described 11st
The second end of switching tube Q11 connects the output negative pole of first dcdc converter by the 12nd switching tube Q12；
The input that the first end of the 13rd switching tube Q13 connects first dcdc converter is positive, and the described 13rd
The second end of switching tube Q13 connects the input cathode of first dcdc converter by the 14th switching tube Q14, and described
The both ends of 11 inductance L11 be separately connected the 13rd switching tube Q13 second end and the 11st switching tube Q11 second
End, the both ends of the 12nd capacitor C12 are separately connected the input anode and input cathode of first dcdc converter；
The both ends of the 11st capacitor C11 are separately connected the output cathode and output negative pole of first dcdc converter.
The input cathode and output negative pole of first dcdc converter interconnect.
The voltage that the bidirectional DC/DC converter can provide photovoltaic group string exports after being boosted, can also be by photovoltaic group
The voltage that string provides exports after reducing.
Controller can control the bidirectional DC/DC to become by adjusting the working condition of the switching tube in bidirectional DC/DC converter
The operating mode of parallel operation.
It is understood that be symmetrical structure for bidirectional DC/DC converter, therefore, the first dcdc converter and second
The structure of dcdc converter is identical.The detailed of its inside is only described in the present embodiment by taking the second dcdc converter as an example
Fine texture and connection relationship.
Referring to Fig. 3, which is three schematic diagram of photovoltaic control device embodiment provided by the invention.
It is introduced so that two dcdc converters are boost DC-DC converter as an example in the present embodiment, it is possible to understand that
It is exported after to be that boost DC-DC converter refers to boosted input voltage.
Second dcdc converter includes: first diode D1, third capacitor C3, the 4th capacitor C4, the second inductance L2
With the 5th switching tube Q5；
The first end of the third capacitor C3 connects the input anode of second dcdc converter, the third capacitor C3's
Second end connects the input cathode of second dcdc converter；
The first end of the 5th switching tube Q5 connects the input anode of second dcdc converter, the 5th switching tube
The second end of Q5 connects the cathode of the first diode D1, and the anode of the first diode D1 connects the 2nd DCDC transformation
The output negative pole of device；
One end of the second inductance L2 connects the second end of the third capacitor C3, the other end of the second inductance L2
Connect the cathode of the first diode D1；
The first end of the 4th capacitor C4 connects the output cathode of second dcdc converter, the 4th capacitor C4's
Second end connects the output negative pole of second dcdc converter；
The input anode and output cathode of second dcdc converter interconnect；
First dcdc converter include: the second diode D2, the 5th capacitor C5, the 6th capacitor C6, third inductance L3,
6th switching tube Q6；
The first end of the 5th capacitor C5 connects the output cathode of first dcdc converter, the 5th capacitor C5
Second end connect the output negative pole of first dcdc converter；
The first end of the 6th switching tube Q6 connects the anode of the second diode D2, the second diode D2's
Cathode connects the first end of the 5th capacitor C5, and the second end of the 6th switching tube Q6 connects first dcdc converter
Input cathode；
The first end of the third inductance L3 connects the input anode of first dcdc converter, the third inductance L3
Second end connect the anode of the second diode D2；
The both ends of the 6th capacitor C6 are separately connected the input anode and input cathode of first dcdc converter.
The input cathode and output negative pole of first dcdc converter interconnect.
The first dcdc converter and the second dcdc converter are boost DC-DC converter in the present embodiment.Wherein, first
Dcdc converter 103 and the second photovoltaic group string 102 are total to negative busbar, and the second dcdc converter 104 and the first photovoltaic group string 101 are total just
Bus.
Referring to fig. 4, which is photovoltaic control device example IV schematic diagram provided by the invention.
It is introduced so that two dcdc converters are buck DC/DC converter as an example in the present embodiment, it is possible to understand that
It is exported after to be that buck DC/DC converter refers to be depressured input voltage.
Second dcdc converter 103 includes: the 7th capacitor C7, the 8th capacitor C8, the 4th inductance L4, third diode
D3 and the 7th switching tube Q7；
The first end of the 7th capacitor C7 connects the input anode of second dcdc converter, the 7th capacitor C7's
Second end connects the input cathode of second dcdc converter；
The cathode of the third diode D3 connects the input anode of second dcdc converter, the third diode D3
Anode the input cathode of second dcdc converter is connected by the 7th switching tube Q7；
The first end of the 8th capacitor C8 connects the output cathode of second dcdc converter, the 8th capacitor C8's
Second end connects the output negative pole of second dcdc converter；
The first end of the 4th inductance L4 connects the anode of the third diode D3, and the second of the 4th inductance L4
End connects the output negative pole of second dcdc converter；
The input anode and output cathode of second dcdc converter interconnect；
First dcdc converter includes: the 9th capacitor C9, the tenth capacitor C10, the 4th diode D4, the 5th inductance L5
With the 8th switching tube Q8；
The first end of the 9th capacitor C9 connects the output cathode of first dcdc converter, the 9th capacitor C9
Second end connect the output negative pole of first dcdc converter；
The first end of the 8th switching tube Q8 connects the input anode of first dcdc converter, the 8th switch
The second end of pipe Q8 connects the cathode of the 4th diode D4, and the anode of the 4th diode D4 connects the first DCDC
The input cathode of converter；
The first end of the 5th inductance L5 connects the cathode of the 4th diode D4, and the second of the 5th inductance L5
End connects the output cathode of first dcdc converter；
The both ends of the tenth capacitor C10 are separately connected the input anode and input cathode of first dcdc converter.
The input cathode and output negative pole of first dcdc converter interconnect.
The first dcdc converter and the second dcdc converter are buck DC/DC converter in the present embodiment.Wherein, first
Dcdc converter 103 and the second photovoltaic group string 102 are total to negative busbar, and the second dcdc converter 104 and the first photovoltaic group string 101 are total just
Bus.
It should be noted that the D1-D4 in above embodiments may be switching tube.When for switching tube, it may be implemented
The two-way flow of energy.
In addition, photovoltaic control device provided in an embodiment of the present invention, can also include: the 5th switching device and the 6th switch
Device；It should be noted that the 5th switching device and the 6th switching device can be switching tube, or diode.Below
Introduce working principle when the two switching devices are diode respectively in conjunction with attached drawing.It is understood that the two are switched
When device is diode, the first end of switching device is the anode of diode, and the second end of switching device is the yin of diode
Pole.When the two switching devices are switching tube, when the first dcdc converter and the second dcdc converter are run, control is opened
It closes pipe and is in normal open state.Since all anti-paralleled diode, anti-paralleled diodes general in present switching tube can rise
To the effect of diode.Such as switching tube is IGBT pipe.
Referring to Fig. 5 a, which is the first schematic diagram of two diode connection types.
The output cathode of first dcdc converter 103 connects the anode of the 5th diode D5, and the described 5th 2
The cathode of pole pipe D5 connects the first port of the first dcdc converter 103；The output negative pole of second dcdc converter 104 connects
The cathode of the 6th diode D6 is connect, the anode of the 6th diode D6 connects the of second dcdc converter 104
Two-port netwerk.
It is understood that the connection type of D5 shown in Fig. 5 a and D6 may be implemented as two in the first dcdc converter
After pole pipe is breakdown, the voltage of the first photovoltaic group string of protection will not be clamped at the output total voltage of the device, to protect the
One photovoltaic group string is not breakdown.
Referring to Fig. 5 b, which is the third schematic diagram of two diode connection types.
The anode of the 5th diode D5 connects the third port of first dcdc converter 103, and the described 5th 2
The cathode of pole pipe D5 connects the input anode of first dcdc converter 103；The anode of the 6th diode D6 connects institute
The input cathode of the second dcdc converter 104 is stated, the cathode of the 6th diode D6 connects second dcdc converter 104
Third port.
The influence when connection type of D5 shown in Fig. 5 b and D6 also can protect the reversal connection of photovoltaic group string to other devices.
In order to make those skilled in the art more fully understand the functional effect of D5 and D6, carried out below with reference to Fig. 5 c detailed
Explanation.It should be noted that Fig. 5 c is two DCDC change by taking the connection type of D5 and D6 in Fig. 5 a as an example, and in Fig. 5 c
Parallel operation is buck DC/DC converter.
After the 4th diode D4 puncture short in the first dcdc converter 103, the 9th electricity of the first dcdc converter
Hold C9 to spark, since the cathode of the first photovoltaic group string 101 is to series connection the 5th between the output cathode of the first dcdc converter
The voltage of the effect of diode D5, the first photovoltaic group string 101 will not be clamped to the total voltage of the device output end, in this way can be with
The first photovoltaic group string 101 is protected not damaged by over-voltage breakdown.
Continue by taking Fig. 5 c as an example, if the second photovoltaic group string 102 is reversely connected, the 9th of the first dcdc converter 103 the
Capacitor C9 and the tenth capacitor C10 spark, due to the cathode and the first dcdc converter 103 in the first photovoltaic group string 101
Connected the 5th diode D5 between output cathode.It is negative in the anode of the second photovoltaic group string 102 and the output of the second dcdc converter
The effect of the 6th diode D6 of interpolar series connection, the voltage of the first photovoltaic group string 101 will not be clamped to the total of the device output end
Voltage, the 8th capacitor C8 (output capacitance) of the second dcdc converter 104 will not be clamped to total electricity of the device output end
Pressure.To protect photovoltaic group string and capacitor not to be damaged.
Since in practical applications, according to the system of 1500V, all switching tube (IGBT) and two poles in dcdc converter
Pipe type selecting is 1200V, capacitor type selecting 1100V, then under the extreme case described in Fig. 5 c, switching tube and diode or capacitor
It is unlikely to by over-voltage breakdown, while ensure that the component in photovoltaic group string will not be by over-voltage breakdown.
It should be noted that the photovoltaic control device that above embodiments provide, only includes the first dcdc converter and second
Dcdc converter, in another implementation of the embodiment of the present invention, which can also include the first photovoltaic
Group string and the second photovoltaic group string, i.e., integrate dcdc converter and photovoltaic group string.
Photovoltaic control device i.e. provided in this embodiment includes: following at least two dcdc converter: the first DCDC transformation
Device and the second dcdc converter；The corresponding first photovoltaic group string of first dcdc converter, second dcdc converter are corresponding
Second photovoltaic group string；
The anode of the first photovoltaic group string connects the output cathode of the device, and the cathode of the first photovoltaic group string connects first
The output negative pole of the output cathode of DC/DC converter, the first DC/DC converter connects the output negative pole of the device；
The cathode of the second photovoltaic group string connects the output negative pole of the device, and the anode of the second photovoltaic group string connects
The output cathode of the output negative pole of two DC/DC converters, the 2nd DC/DC converter connects the output cathode of the device；
The input anode of the first DC/DC converter is connected with the anode of the second photovoltaic group string, the first DC/DC
The input cathode of converter is connected with the cathode of the second photovoltaic group string；The input anode of the 2nd DC/DC converter and
The anode of one photovoltaic group string is connected, and the input cathode of the 2nd DC/DC converter is connected with the cathode of the first photovoltaic group string
It connects.
It should be noted that first, the specific structure for the dcdc converter that above embodiments provide is equally applicable to this reality
The photovoltaic control device of example offer is provided；Second, the first photovoltaic group string and the second photovoltaic group string that above embodiments provide can
Think the photovoltaic group string with counterflow-preventing function, such as in anode or cathode one diode of series connection of conventional photovoltaic group string, structure
At the photovoltaic group string with counterflow-preventing function.
Based on the photovoltaic control device that above embodiments provide, the embodiment of the present invention also provides a kind of photovoltaic control system,
It is described in detail with reference to the accompanying drawing.
Referring to Fig. 6, which is photovoltaic control system schematic diagram provided by the invention.
Photovoltaic control device 500 described in photovoltaic provided in this embodiment, further includes: inverter 600；
The input anode of the inverter 600 connects the output cathode of the photovoltaic control device 500, the inverter
600 input cathode connects the output negative pole of the photovoltaic control device 500.
The inverter 600, the electricity between output cathode and output negative pole for controlling the photovoltaic control device 500
Pressure is within a predetermined range.
It is understood that the photovoltaic control system is suitable for string type photovoltaic system and centralized photovoltaic system, effectively
Solves the technical issues of photovoltaic module series connection mismatch.
In another implementation of the embodiment of the present invention, when the system includes multiple photovoltaic control devices
When, further includes: at least one header box；
When the header box is one, the output cathode of all photovoltaic control devices is connecting the input of the header box just
Pole, the output negative pole of all photovoltaic control devices connect the input cathode of the header box, and the output cathode of the header box connects
The input anode of the inverter is connect, the output negative pole of the header box connects the input cathode of the inverter；
When the number of the header box is equal with the number of photovoltaic control device, each photovoltaic control device output cathode
The input anode of the header box is connected, the output negative pole of each photovoltaic control device connects the input cathode of the header box,
The output cathode of all header boxs connects the input anode of the inverter, and the output negative pole of all header boxs connects the inversion
The input cathode of device；
When the number of the header box is less than the number of the photovoltaic control device, the output of multiple photovoltaic control devices
Anode connects the input anode an of header box, and the input that the output negative pole of multiple photovoltaic control devices connects a header box is negative
Pole, the input that the output cathode of all header boxs connects the inverter is positive, described in the output negative pole connection of all header boxs
The input cathode of inverter.
It is understood that header box can be series between photovoltaic control device and inverter, it is to be understood that converge
Flowing case can be one, or multiple.Specific number can be arranged according to the actual situation.Device that can be all is total
With a header box, a header box can also be shared with partial devices.
When the power of inverter is larger, need to input inverter after converging the power of photovoltaic module, therefore, it is necessary to converge
Case is flowed to realize the convergence of power.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (10)
1. a kind of photovoltaic control device characterized by comprising following at least two dcdc converter: the first dcdc converter,
Second dcdc converter, the 5th switching device and the 6th switching device；
The first port of the cathode of first dcdc converter the first photovoltaic group string of reserved connection, for connecting the defeated of the device
The second port of cathode and the third port for connecting the second photovoltaic group string anode out；The output of first dcdc converter
Anode and output negative pole are separately connected the first port and second port of the first dcdc converter；The first photovoltaic group string is just
Pole connects the output cathode of the device；
The first port of the reserved output cathode for connecting the device of second dcdc converter, for connecting the second photovoltaic group string
Anode second port and the cathode for connecting the first photovoltaic group string third port；Second dcdc converter
Output cathode and output negative pole be separately connected the first port and second port of the second dcdc converter；The second photovoltaic group
The cathode of string connects the output negative pole of the device；
The output cathode of first dcdc converter connects the first end of the 5th switching device, the 5th switching device
Second end connect the cathode of the first photovoltaic group string；The output negative pole connection the described 6th of second dcdc converter is opened
The second end of device is closed, the first end of the 6th switching device connects the anode of the second photovoltaic group string；
Or,
The first end of 5th switching device connects the third port of second dcdc converter, the 5th switching device
Second end connect the output cathode of first dcdc converter；The first end connection described second of 6th switching device
The second end of the output negative pole of dcdc converter, the 6th switching device connects the third end of first dcdc converter
Mouthful.
2. photovoltaic control device according to claim 1, which is characterized in that further include: controller；
The controller, for carrying out maximum power tracing control to the first photovoltaic group string and the second photovoltaic group string, when judging
When stating the output voltage of the first photovoltaic group string and needing to change, the output voltage variation of first dcdc converter, the dress are controlled
The voltage between output cathode and output negative pole set is within a predetermined range；When the output voltage for judging the second photovoltaic group string
When needing to change, control the output voltage variation of second dcdc converter, the output cathode and output negative pole of the device it
Between voltage within a predetermined range.
3. photovoltaic control device according to claim 1 or 2, which is characterized in that first dcdc converter and second
Dcdc converter is bidirectional DC/DC converter.
4. photovoltaic control device according to claim 3, which is characterized in that second dcdc converter includes: first
Switching tube, second switch, third switching tube, the 4th switching tube, first capacitor, the second capacitor and the first inductance；
The first end of the first switch tube connects the input anode of second dcdc converter, and the of the first switch tube
Two ends connect the input cathode of second dcdc converter by the second switch；
The first end of the third switching tube connects the output cathode of second dcdc converter, and the of the third switching tube
Two ends connect the output negative pole of second dcdc converter by the 4th switching tube；
One end of first inductance connects the second end of the first switch tube, described in the other end connection of first inductance
The second end of third switching tube；
The first capacitor is connected in parallel on the input cathode of the input anode and the second dcdc converter of second dcdc converter
Between, second capacitor is connected in parallel on the output cathode of second dcdc converter and the output negative pole of the second dcdc converter
Between；
The input anode and output cathode of second dcdc converter interconnect；
First dcdc converter includes: the 11st switching tube, the 12nd switching tube, the 13rd switching tube, the 14th switch
Pipe, the 11st capacitor, the 12nd capacitor and the 11st inductance；
The first end of 11st switching tube connects the output cathode of first dcdc converter, the 11st switching tube
Second end the output negative pole of first dcdc converter is connected by the 12nd switching tube；
The first end of 13rd switching tube connects the input anode of first dcdc converter, the 13rd switching tube
Second end the input cathode of first dcdc converter is connected by the 14th switching tube, the 11st inductance
Both ends are separately connected the second end of the 13rd switching tube and the second end of the 11st switching tube, and the two of the 12nd capacitor
End is separately connected the input anode and input cathode of first dcdc converter；
The both ends of 11st capacitor are separately connected the output cathode and output negative pole of first dcdc converter；
The input cathode and output negative pole of first dcdc converter interconnect.
5. photovoltaic control device according to claim 1 or 2, which is characterized in that first dcdc converter and second
Dcdc converter is boost DC-DC converter.
6. photovoltaic control device according to claim 5, which is characterized in that second dcdc converter includes: first
Diode, third capacitor, the 4th capacitor, the second inductance and the 5th switching tube；
The first end of the third capacitor connects the input anode of second dcdc converter, the second end of the third capacitor
Connect the input cathode of second dcdc converter；
The first end of 5th switching tube connects the input anode of second dcdc converter, and the of the 5th switching tube
Two ends connect the cathode of the first diode, and the anode of the first diode connects the output of second dcdc converter
Cathode；
One end of second inductance connects the second end of the third capacitor, the other end connection of second inductance described the
The cathode of one diode；
The first end of 4th capacitor connects the output cathode of second dcdc converter, the second end of the 4th capacitor
Connect the output negative pole of second dcdc converter；
The input anode and output cathode of second dcdc converter interconnect；
First dcdc converter includes: the second diode, the 5th capacitor, the 6th capacitor, third inductance, the 6th switching tube；
The first end of 5th capacitor connects the output cathode of first dcdc converter, the second end of the 5th capacitor
Connect the output negative pole of first dcdc converter；
The first end of 6th switching tube connects the anode of second diode, and the cathode of second diode connects institute
The first end of the 5th capacitor is stated, the second end of the 6th switching tube connects the input cathode of first dcdc converter；
The first end of the third inductance connects the input anode of first dcdc converter, the second end of the third inductance
Connect the anode of second diode；
The both ends of 6th capacitor are separately connected the input anode and input cathode of first dcdc converter；
The input cathode and output negative pole of first dcdc converter interconnect.
7. photovoltaic control device according to claim 1 or 2, which is characterized in that first dcdc converter and second
Dcdc converter is buck DC/DC converter.
8. photovoltaic control device according to claim 7, which is characterized in that second dcdc converter includes: the 7th
Capacitor, the 8th capacitor, the 4th inductance, third diode and the 7th switching tube；
The first end of 7th capacitor connects the input anode of second dcdc converter, the second end of the 7th capacitor
Connect the input cathode of second dcdc converter；
The cathode of the third diode connects the input anode of second dcdc converter, the anode of the third diode
The input cathode of second dcdc converter is connected by the 7th switching tube；
The first end of 8th capacitor connects the output cathode of second dcdc converter, the second end of the 8th capacitor
Connect the output negative pole of second dcdc converter；
The first end of 4th inductance connects the anode of the third diode, described in the second end connection of the 4th inductance
The output negative pole of second dcdc converter；
The input anode and output cathode of second dcdc converter interconnect；
First dcdc converter includes: the 9th capacitor, the tenth capacitor, the 4th diode, the 5th inductance and the 8th switching tube；
The first end of 9th capacitor connects the output cathode of first dcdc converter, the second end of the 9th capacitor
Connect the output negative pole of first dcdc converter；
The first end of 8th switching tube connects the input anode of first dcdc converter, and the of the 8th switching tube
Two ends connect the cathode of the 4th diode, and the anode of the 4th diode connects the input of first dcdc converter
Cathode；
The first end of 5th inductance connects the cathode of the 4th diode, described in the second end connection of the 5th inductance
The output cathode of first dcdc converter；
The both ends of tenth capacitor are separately connected the input anode and input cathode of first dcdc converter；
The input cathode and output negative pole of first dcdc converter interconnect.
9. a kind of photovoltaic control system, which is characterized in that including the described in any item photovoltaic controls of at least one claim 1-8
Device, further includes: inverter；
The input anode of the inverter connects the output cathode of the photovoltaic control device, and the input cathode of the inverter connects
Connect the output negative pole of the photovoltaic control device；
The inverter, the voltage between output cathode and output negative pole for controlling the photovoltaic control device is in predetermined model
In enclosing.
10. photovoltaic control system according to claim 9, which is characterized in that when the system includes multiple photovoltaics
When control device, further includes: at least one header box；
When the header box is one, the output cathode of all photovoltaic control devices connects the input anode of the header box,
The output negative pole of all photovoltaic control devices connects the input cathode of the header box, and the output cathode of the header box connects institute
The input anode of inverter is stated, the output negative pole of the header box connects the input cathode of the inverter；
When the number of the header box is equal with the number of photovoltaic control device, each photovoltaic control device output cathode connection
The input anode of the header box, the output negative pole of each photovoltaic control device connect the input cathode of the header box, own
The output cathode of header box connects the input anode of the inverter, and the output negative pole of all header boxs connects the inverter
Input cathode；
When the number of the header box is less than the number of the photovoltaic control device, the output cathode of multiple photovoltaic control devices
The input anode an of header box is connected, the output negative pole of multiple photovoltaic control devices connects the input cathode of a header box,
The output cathode of all header boxs connects the input anode of the inverter, and the output negative pole of all header boxs connects the inversion
The input cathode of device.
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| CN1445914A (en) * | 2000-12-04 | 2003-10-01 | Nec东金株式会社 | Symmetrical DC/DC converter |
| CN203313097U (en) * | 2013-06-04 | 2013-11-27 | 深圳市长昊机电有限公司 | Large power photovoltaic power generation system |
| CN205105166U (en) * | 2015-11-27 | 2016-03-23 | 国网冀北电力有限公司电力科学研究院 | Photovoltaic power generation system |
| CN105827180A (en) * | 2016-05-24 | 2016-08-03 | 西交利物浦大学 | Distributed photovoltaic system based on Beta parameter difference power control |
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| CN101902060B (en) * | 2010-07-23 | 2012-07-04 | 重庆大学 | Charge-discharge battery pack equilibrium management system |
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|---|---|---|---|---|
| CN1445914A (en) * | 2000-12-04 | 2003-10-01 | Nec东金株式会社 | Symmetrical DC/DC converter |
| CN203313097U (en) * | 2013-06-04 | 2013-11-27 | 深圳市长昊机电有限公司 | Large power photovoltaic power generation system |
| CN205105166U (en) * | 2015-11-27 | 2016-03-23 | 国网冀北电力有限公司电力科学研究院 | Photovoltaic power generation system |
| CN105827180A (en) * | 2016-05-24 | 2016-08-03 | 西交利物浦大学 | Distributed photovoltaic system based on Beta parameter difference power control |
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