CN110098730A - A kind of three-level Boost converter, control method and photovoltaic system - Google Patents
A kind of three-level Boost converter, control method and photovoltaic system Download PDFInfo
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- CN110098730A CN110098730A CN201910501505.9A CN201910501505A CN110098730A CN 110098730 A CN110098730 A CN 110098730A CN 201910501505 A CN201910501505 A CN 201910501505A CN 110098730 A CN110098730 A CN 110098730A
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- 238000002955 isolation Methods 0.000 claims description 29
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F37/00—Fixed inductances not covered by group H01F17/00
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- H02J3/385—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- 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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
This application discloses a kind of three-level Boost converter, control method and photovoltaic systems.Wherein, which includes: integrated coupling reactance, first switch tube, second switch, third switching tube and the 4th switching tube, first capacitor and the second capacitor；The integrated coupling reactance includes the first winding, the second winding and common core, and first winding and the second winding are installed in the common core；The first end of first winding and the first end of second winding are Same Name of Ends.Using the three-level Boost converter, the cost, volume and weight of converter can be significantly reduced, the problem that core saturation degree is inconsistent as caused by core body difference is also solved.Meanwhile it is provided by the present application with same pass control method is opened, it is possible to prevente effectively from bus capacitor voltage un-balance problem.
Description
Technical field
The present invention relates to power electronics field more particularly to a kind of three-level Boost converters, control method and light
Volt system.
Background technique
Photovoltaic power generation is the photovoltaic effect using interface, and luminous energy is changed into a kind of technology of electric energy.By
In being illuminated by the light the influence with factors such as temperature, the voltage change range of photovoltaic battery panel output is wider, in order to utilize to greatest extent
The generating capacity of photovoltaic battery panel usually will increase two level Boost booster circuits before photovoltaic DC-to-AC converter.It is shown in Figure 1,
Boost circuit 103 is connect with photovoltaic DC-to-AC converter 102, in input voltage lower than the minimum grid-connected DC voltage of photovoltaic DC-to-AC converter
It is required that when, Boost circuit 103 works to realize boosting and MPPT maximum power point tracking；It is higher than photovoltaic inversion in input voltage
When the grid-connected DC voltage of device minimum requires, to reduce loss, Boost circuit 103 does not work, two poles of bypass branch 101
Pipe D conducting, realizes energy transmission.
As the input voltage configuration of photovoltaic generating system is higher and higher, 1500V high-pressure system gradually becomes the master in market
Stream.But since single switch device voltage stress is limited, two traditional level Boost booster circuits are difficult to meet 1500V system
It is required that.Referring to fig. 2, which is the schematic diagram of traditional three-level Boost converter, which includes that two level are positive
Boost circuit 201 and two level negative sense Boost circuits 202.Switching tube Q1, Q2 and diode D1, D2 voltage of the converter are answered
Power is only the half of output voltage, thus can be directly using the lower voltage grade power of low cost in power device type selecting
Device realizes high-tension electricity transformation.
But the converter needs two independent reactance L1 and L2, thus volume and weight is big.Particularly with including multichannel
The gird-connected inverter of MPPT (Maximum Power Point Tracking, MPPT maximum power point tracking) is all wrapped per MPPT all the way
A three-level Boost converter is included, will lead to the cost of whole system, volume and weight is significantly increased.
Simultaneously because symmetrical three level BOOST reactance is using two independent electricals based on independent magnetic core in the prior art
It is anti-, it is influenced by core body otherness, the inductance value and core saturation degree of two independent reactance are difficult to ensure one when practical application
It causes.And in traditional control mode, inductive current flows through minus half bus capacitor when Q1 opens Q2 shutdown, open-minded in Q1 shutdown Q2
Shi Liujing just half bus capacitor, thus the control mode needs to increase additional Pressure and Control, causes system control complicated.
Summary of the invention
In order to solve the above-mentioned technical problem, this application provides a kind of three-level Boost converter, control method and photovoltaics
System significantly reduces the cost, volume and weight of converter, also solves the core saturation as caused by core body difference
The inconsistent problem of degree, and it is possible to prevente effectively from bus capacitor imbalance problem.
This application provides a kind of three-level Boost converters, comprising: integrated coupling reactance, first switch tube, second open
Guan Guan, third switching tube and the 4th switching tube, first capacitor and the second capacitor；
The integrated coupling reactance includes the first winding, the second winding and common core, and first winding and second
Winding is installed in the common core；The positive input terminal of the first end connection converter of first winding, described first
The second end of winding connects first node；The first end of the third switching tube connects the first node, the third switch
The second end of pipe connects the positive output end of the converter；
The first end of the first switch tube connects the first node, the second end connection second of the first switch tube
Node, the first end of the second switch connect the second node, and the second end of the second switch connects third section
Point；
The first end of second winding connects the third node, and the second end of second winding connects the transformation
The negative input end of device, the first end of the 4th switching tube connect the negative output terminal, and the second end of the 4th switching tube connects
Connect the third node；
The both ends of the first capacitor are separately connected the positive output end and the second node of the converter, and described second
The both ends of capacitor are separately connected the negative output terminal and the second node of the converter；
The first end of first winding and the first end of second winding are Same Name of Ends.
Optionally, the inductance that the inductance and the second winding that first winding is presented are presented is identical.
Optionally, the number of turns of first winding is identical with the number of turns of second winding.
Optionally, the material of first winding is identical with the material of second winding.
Optionally, the first switch tube and second switch are opened or are simultaneously turned off simultaneously.
Optionally, which further includes the first isolation drive chip and the second isolation drive chip；
The output end on the first isolation drive chip pair side connects the control terminal of the first switch tube, for controlling
State the switch state of first switch tube；
The output end on the second isolation drive chip pair side connects the control terminal of the second switch, for controlling
State the switch state of second switch；
The corresponding light emitting diode of first isolation drive chip primary side and the second isolation drive chip primary side pair
The logic control level of driving pulse is connected after the light emitting diode series connection answered.
Optionally, the third switching tube and the 4th switching tube are diode；
The anode of the third switching tube connects the first node, and the cathode connection of the third switching tube is described just defeated
Outlet；The anode of 4th switching tube connects the negative output terminal, and the cathode of the 4th switching tube connects the third section
Point.
The embodiment of the present application also provides a kind of control methods of three-level Boost converter, are applied to the transformation
Device is controlled, and the converter includes: integrated coupling reactance, first switch tube, second switch, third switching tube and the 4th
Switching tube, first capacitor and the second capacitor；The integrated coupling reactance includes the first winding, the second winding and common core；Institute
The positive input terminal of the first end connection converter of the first winding is stated, the second end of first winding connects first node；It is described
The first end of third switching tube connects the first node, and the second end of the third switching tube connects the just defeated of the converter
Outlet；The first end of the first switch tube connects the first node, and the second end of the first switch tube connects the second section
Point, the first end of the second switch connect the second node, and the second end of the second switch connects third node；
The first end of second winding connects the third node, and it is defeated that the second end of second winding connects bearing for the converter
Enter end, the first end of the 4th switching tube connects the negative output terminal, the second end connection of the 4th switching tube described the
Three nodes；The both ends of the first capacitor are separately connected the positive output end and the second node of the converter, and described second
The both ends of capacitor are separately connected the negative output terminal and the second node of the converter；The first end of first winding and institute
The first end for stating the second winding is Same Name of Ends；
This method comprises:
In converter work, controls the first switch tube and second switch while opening or simultaneously turning off.
Optionally, when the first switch tube and second switch are opened simultaneously, current path are as follows: described first around
Group-the-the second winding of first switch tube-second switch；
When the first switch tube and second switch simultaneously turn off, current path are as follows: the first winding-third is opened
Close the-the second winding of the-the four switching tube of the-the second capacitor of pipe-first capacitor.
The embodiment of the present application also provides a kind of photovoltaic systems, which is characterized in that including three electricity described in any of the above embodiments
Flat Boost, further includes: inverter and controller；
The three-level Boost converter, it is described for being sent to after boosting to the direct current that photovoltaic module exports
Inverter；
The inverter, the direct current for exporting the three-level Boost converter are converted to alternating current and feed back to
AC network；
The controller, for controlling the first switch tube and second in three-level Boost converter work
Switching tube is opened or is simultaneously turned off simultaneously.
Optionally, the photovoltaic system further include: third diode and the 4th diode；
The anode of the third diode connects the positive input terminal of the three-level Boost converter, the three or two pole
The cathode of pipe connects the positive output end of the three-level Boost converter；
The anode of 4th diode connects the negative output terminal of the three-level Boost converter, the four or two pole
The cathode of pipe connects the negative input end of the three-level Boost converter.
Optionally, the photovoltaic system further include: the first relay and the second relay；
One end of first relay connects the positive input terminal of the three-level Boost converter, first relay
The other end of device connects the positive output end of the three-level Boost converter；
One end of second relay connects the negative output terminal of the three-level Boost converter, second relay
The other end of device connects the negative input end of the three-level Boost converter；
The controller is also used to when the three-level Boost converter does not work, control first relay and
Second relay is closed.Compared with prior art, the application has at least the following advantages:
Three-level Boost converter provided by the present application uses integrated coupling reactance, by the first winding and the second winding
It is wound on the same common core, due to only needing a magnetic core, reduces the cost, volume and weight of converter.It can protect
The core saturation degree for holding the first winding and the second winding is consistent always, solves the core saturation as caused by core body difference
The inconsistent problem of degree improves the reliability of converter, and in converter work, two windings are in common core
The flow direction of generation is identical, can play the role of the enhancing that intercouples, and increases the inductance of circuit, therefore can also drop
Low inductive current ripple.Meanwhile it is provided by the present application with same pass control method is opened, it is possible to prevente effectively from bus capacitor voltage un-balance is asked
Topic.
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 the circuit diagram of two level Boosts booster circuit provided by the present application；
Fig. 2 is the schematic diagram of traditional three-level Boost converter provided by the present application；
Fig. 3 is a kind of schematic diagram of working condition of traditional three-level Boost converter provided by the present application；
Fig. 4 is the schematic diagram of another working condition of traditional three-level Boost converter provided by the present application；
Fig. 5 is a kind of schematic diagram for three-level Boost converter that the embodiment of the present application one provides；
Fig. 6 is the schematic diagram of the integrated coupling reactance for the three-level Boost converter that the embodiment of the present application one provides；
Fig. 7 is the circuit diagram for another three-level Boost converter that the embodiment of the present application two provides；
Fig. 8 is the schematic diagram for the isolation drive chip that the embodiment of the present application two provides；
Transformation shown in Fig. 7 when Fig. 9 is the first switch tube that the embodiment of the present application three provides and second switch while opening
The working state schematic representation of device；
Figure 10 is transformation shown in Fig. 7 when the first switch tube that the embodiment of the present application three provides and second switch simultaneously turn off
The working state schematic representation of device；
Figure 11 is a kind of schematic diagram for photovoltaic system that the embodiment of the present application four provides；
Figure 12 is the schematic diagram for another photovoltaic system that the embodiment of the present application four provides；
Figure 13 is the schematic diagram for another photovoltaic system that the embodiment of the present application four provides；
Figure 14 is the schematic diagram for another photovoltaic system that the embodiment of the present application four provides.
Specific embodiment
In order to make those skilled in the art more fully understand scheme, first illustrate traditional three-level Boost converter below
Control mode.
Traditional three-level Boost converter is using asynchronous three-level control principle mode, with continued reference to shown in Fig. 2
Three-level Boost converter, when switching tube Q1 is opened and switching tube Q2 is turned off, the working condition of three-level Boost converter
As shown in figure 3, ideally, it is desirable to L1=L2.Electric current is flowed out from positive input terminal, flows successively through L1, switching tube Q1, negative half mother
Line capacitance C2, diode D2, inductance L2, finally flow into negative input end.
When switching tube Q1 shutdown and when switching tube Q2 is opened, the working condition of three-level Boost converter as shown in figure 4,
Electric current is flowed out from positive input terminal, is flowed successively through L1, diode D1, just half bus capacitor C1, switching tube Q2, inductance L2, is finally flowed
Enter negative input end.
When the converter operation mode switches, charges respectively to the capacitor C1 and C2 of positive and negative busbar, will lead to output bus
There are biggish common mode voltage jumps with respect to negative input end for the current potential of capacitor midpoint O, and system leakage current is caused to significantly increase；And
Since the charging to C1 and C2 is asynchronous, for the electric voltage equalization for guaranteeing C1 and C2, it is also necessary to increase additional pressure in control
Control strategy, the complexity for causing system to control greatly promote.
Meanwhile two reactance of the three-level Boost converter require individual magnetic core, increase converter at
This, volume and weight, on the other hand, when practical application, is influenced by core body otherness, the saturation journey of two magnetic cores
Degree, which is difficult to ensure, unanimously causes the inductance of L1 and L2 different.
In order to solve the above-mentioned technical problem, this application provides a kind of three-level Boost converter, which is used
Integrated coupling reactance, by the first winding and the second winding technique in the same common core, since the converter only needs one
Independent magnetic core, therefore it is consistent fundamentally to solve the problems, such as that core saturation degree is difficult to ensure, reduce converter cost,
Volume and weight, while present invention also provides a kind of control method applied to the three-level Boost converter, it can keep away
Exempt from just half bus and minus half bus capacitor voltage is unbalanced.
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.
Embodiment one:
The embodiment of the present application one provides a kind of three-level Boost converter, illustrates with reference to the accompanying drawing.
Referring to Fig. 5, which is a kind of schematic diagram for three-level Boost converter that the embodiment of the present application one provides.
The converter include: integrated coupling reactance 501, first switch tube Q1, second switch Q2, third switching tube Q3
With the 4th switching tube Q4, first capacitor C1 and the second capacitor C2.Wherein, integrating coupling reactance 501 includes the first winding N1, second
Winding N2 and common core, and the first winding N1 and the second winding N2 share the common core.
The positive input terminal of the first end connection converter of first winding N1, the second end of the first winding N1 connect first node
The first end of A, third switching tube Q3 connect first node A, the positive output end of the second end connection converter of third switching tube Q3
Vout+。
The first end of first switch tube Q1 connects first node A, and the second end of first switch tube connects second node B, the
The first end of two switching tube Q2 connects second node B, the second end third node C of second switch.
The first end of second winding N2 connects third node C, the negative input of the second end connection converter of the second winding N2
End, the first end of the 4th switching tube Q4 connect negative output terminal Vout-, and the second end of the 4th switching tube connects third node C.
The both ends of first capacitor C1 are separately connected the positive output end Vout+ and second node B of converter, the second capacitor C2's
Both ends are separately connected the negative output terminal and second node B of converter.
The positive output end Vout+ and negative output terminal Vout- of converter connect photovoltaic DC-to-AC converter (not showing that in figure).
First winding N1 and the second winding N2 shares a common core, the first end of the first winding N1 and described second around
The first end of group N2 is Same Name of Ends.
Referring to Fig. 6, which is showing for the integrated coupling reactance for the three-level Boost converter that the embodiment of the present application one provides
It is intended to.
Integrated coupling reactance 501 in structure corresponding diagram shown in Fig. 65, the first winding N1 of the integrated coupling reactance and the
Two winding N2 are wound in the same common core 600, and the first end of the first end of the first winding N1 and the second winding N2 are same
Name end.When electric current is flowed into from the first end of the first winding N1, the magnetic flux that the first winding N1 is generated in common core 600 is Φ
1, when electric current is flowed into from the first end of the second winding N2, the magnetic flux that the second winding N2 is generated in common core 600 is Φ 2,
Since the direction of Φ 1 and Φ 2 is identical, two magnetic fluxs can intercouple enhancing.
If indicating the inductance that the first winding N1 and common core are constituted with L1, the second winding N2 and public magnetic are indicated with L2
The inductance that core is constituted, indicates the mutual induction amount between inductance L1 and inductance L2 with M, then converter part shown in Fig. 6 at work
Equivalent inductance be L1+L2+M, it is seen that since the enhancing that intercouples of magnetic flux causes inductance to increase, can also effectively drop
Low inductive current ripple.
Wherein above-mentioned switching tube can be metal-oxide-semiconductor (metal oxide semiconductor, metal-oxide semiconductor (MOS)
Field effect transistor) or IGBT (insulated gate bipolar transistor, insulated gate bipolar transistor), the
Three switching tube Q3 and the 4th switching tube Q4 can also be diode.
The words such as " first ", " second " in the present embodiment and following embodiment explanation merely for convenience, constitute pair
In the restriction of the application.
Three-level Boost converter provided by the embodiments of the present application uses integrated coupling reactance, by the first winding and the
Two winding techniques only need a magnetic core in the same common core, can reduce the cost of converter, volume and again
Amount, additionally it is possible to keep the core saturation degree of the first winding and the second winding consistent always, solve and drawn by core body difference
The inconsistent problem of the core saturation degree risen improves the reliability of converter, and in converter work, two windings
The flow direction generated in common core is identical, can play the role of the enhancing that intercouples, and increases the inductance of circuit,
Therefore inductive current ripple can also be reduced.
Embodiment two:
The embodiment of the present application two additionally provides another three-level Boost converter, and the difference with embodiment one is this
The first winding and the inductance that is presented of the second winding for the three-level Boost converter that embodiment provides are identical, in order to realize the
One switching tube and second switch are opened or are simultaneously turned off simultaneously, which further comprises isolation drive chip, below with reference to
Attached drawing illustrates.
Referring to Fig. 7, which is the circuit diagram for another three-level Boost converter that the embodiment of the present application two provides.
On the basis of the converter that embodiment one provides, converter provided in this embodiment further include: the first isolation is driven
Dynamic chip 701 and the second isolation drive chip 702.First isolation drive chip 701 and the second isolation drive chip 702 can be complete
It is exactly the same.
The first switch tube Q1 and second switch Q2 of the converter are metal-oxide-semiconductor or IGBT, and third switching tube and the 4th is opened
Guan Guanwei diode is indicated with D1 and D2 in figure.The anode of diode D1 connects first node A, the cathode connection of diode D1
The anode of positive output end Vout+, diode D2 connect negative output terminal Vout-, and the cathode of diode D2 connects third node C.
The inductance L2 that the inductance L1 and the second winding N2 that first winding N1 of the converter is presented are presented is identical.Therefore
When designing the first winding N1 and the second winding N2, material, the number of turns and the winding of the first winding N1 and the second winding N2 can be made
The cross-sectional area of conductor is identical.
Referring to Fig. 8, which is the schematic diagram for the isolation drive chip that the embodiment of the present application two provides.
The structure of dotted box portion in Fig. 8 corresponding diagram 7, the output end connection on the secondary side of the first isolation drive chip 701 the
The control terminal of one switching tube Q1, for controlling the switch state of first switch tube Q1；The secondary side of second isolation drive chip 702 it is defeated
Outlet connects the control terminal of second switch Q2, for controlling the switch state of second switch Q2.
The corresponding light emitting diode D of first isolation drive chip, 701 primary sideL1With 702 primary side pair of the second isolation drive chip
The light emitting diode D answeredL2The logic control level of driving pulse is connected after series connection, resistance R is for limiting electric current to protect circuit.
The logic control level is PWM (Pulse Width Modulation, pulse width modulation) logic control level.
Therefore when driving two isolation drive chips, the electric current of two isolation drive chip primary side light emitting diodes is flowed through
It is equal in magnitude, ignore the minimum transmission delay otherness of two isolation drive chip chambers, can be realized switching tube Q1 and Q2 according to
The duty-cycle requirement of boosting is opened or is simultaneously turned off simultaneously.
The inductance L1 and second that first winding N1 of three-level Boost converter provided by the embodiments of the present application is presented around
The inductance L2 that group N2 is presented is identical, and open-minded while control switch pipe Q1 and Q2 accurate by two isolation drive chips
Or simultaneously turn off, so that the charge characteristic of the first capacitor C1 of the converter and the second capacitor C2 are consistent with flash-over characteristic, therefore
Common mode voltage jump is not present relative to negative input end in the current potential of the midpoint O of capacitor C1 and capacitor C2, while realizing the first electricity
The electric voltage equalization for holding C1 and the second capacitor C2, avoids increasing additional electric voltage equalization strategy, simplifies system.
Embodiment three:
With continued reference to Fig. 2 to Fig. 4, due to using asynchronous three level when controlling traditional three-level Boost converter
Control mode causes the current potential for exporting bus capacitor midpoint O, there are biggish common mode voltage jump, to increase with respect to negative input end
Leakage current；And inductive current flows through C2 when Q1 opens Q2 shutdown, when flowing through the charging of C1, C1 and C2 when Q1 shutdown Q2 is opened
Between it is inconsistent, thus need to increase additional Pressure and Control also with the voltage of balanced C1 and C2, cause system control complicated.In order to
It solves the above problems, the embodiment of the present application also provides a kind of control methods of three-level Boost converter, with reference to the accompanying drawing
It illustrates.
Control method provided by the embodiments of the present application is synchronous switch control mode, specifically:
In converter work, controls first switch tube and second switch is opened or simultaneously turned off simultaneously.
Below with controller shown in Fig. 7 in order to which after being illustrated, the specific structure of three-level Boost converter and work are former
Reason may refer to the related description of above-described embodiment, and details are not described herein by the application.
Referring to Fig. 9, the working condition of converter shown in Fig. 7 when which is first switch tube and second switch while opening
Schematic diagram.
When first switch tube Q1 and second switch Q2 is opened simultaneously, electric current is flowed out from positive input terminal, current path (figure
In dashed path) are as follows: first winding N1- first switch tube Q1- second switch Q2- the second winding N2, finally flow into bear it is defeated
Enter end.
Referring to Figure 10, which is the work shape of converter shown in Fig. 7 when first switch tube and second switch simultaneously turn off
State schematic diagram.
When the first switch tube Q1 and second switch Q2 are simultaneously turned off, electric current is flowed out from positive input terminal, electric current road
Diameter is (dashed path in figure): the first winding N1- first diode D1- first capacitor the second capacitor of C1- C2- the two or two
Pole pipe D2- the second winding N2, finally flows into negative input end.
As it can be seen that when using this method control first switch tube Q1 and second switch Q2, the electricity of first capacitor C1 and second
The charge characteristic for holding C2 is consistent with flash-over characteristic, thus the equilibrium of capacitance voltage can be realized automatically in the control method, avoids increasing
Add additional electric voltage equalization strategy, simplifies system.Meanwhile the current potential of the midpoint O of first capacitor C1 and the second capacitor C2 are opposite
Common mode voltage jump is not present in negative input end, reduces the leakage current of converter.
Example IV:
The three-level Boost converter provided based on the above embodiment, the embodiment of the present application also provides a kind of photovoltaic systems
System, illustrates with reference to the accompanying drawing.
Referring to Figure 11, which is a kind of schematic diagram for photovoltaic system that the embodiment of the present application four provides.
The photovoltaic system 1100 includes: three-level Boost converter 1101, controller 1102 and inverter 1103.
Wherein, three-level Boost converter 1101 is sent to after the direct current that photovoltaic module exports can be boosted
Inverter 1103, the specific structure and working principle of three-level Boost converter 1101 may refer to above-described embodiment, herein
It repeats no more.
The direct current that three-level Boost converter 1101 exports can be converted to alternating current and feed back to friendship by inverter 110
Galvanic electricity net.
In the input voltage of three-level Boost converter 1101 grid-connected DC voltage minimum lower than inverter, converter
1101 work, the first switch tube and second switch that controller 1102 controls three-level Boost converter 1101 at this time are simultaneously
It opens or simultaneously turns off, realize boosting inverter.By taking three-level Boost converter 1101 is structure shown in Fig. 7 as an example, this time control
Device 1102 processed presets the pwm signal of duty ratio, control by sending to the first isolation drive chip and the second isolation drive chip
Switching tube Q1 and Q2 is opened or is simultaneously turned off simultaneously according to the requirement of default duty ratio.
Photovoltaic system provided by the embodiments of the present application includes three-level Boost converter provided by the above embodiment, should
Converter uses integrated coupling reactance, the public common core of two windings, thus can reduce photovoltaic system cost,
Volume and weight, additionally it is possible to keep the core saturation degree of the first winding and the second winding consistent always, improve converter
Reliability.In converter work, the flow direction that two windings generate in common core is identical, can play phase mutual coupling
Close the effect of enhancing, additionally it is possible to reduce inductive current ripple.
In addition, opening or simultaneously turning off simultaneously when controlling first switch tube and second switch by controller, make first
The charge characteristic and flash-over characteristic of capacitor and the second capacitor are consistent, thus the equilibrium of capacitance voltage can be realized automatically, and are kept away
Exempt to increase additional electric voltage equalization strategy, simplifies system.Meanwhile the midpoint of first capacitor and the second capacitor, i.e. converter
Common mode voltage jump is not present relative to negative input end in the current potential for exporting bus capacitor midpoint, therefore also reduces the leakage of converter
Electric current.
Referring to Figure 12, which is the schematic diagram for another photovoltaic system that the embodiment of the present application four provides.
The photovoltaic system 1200 and the difference of photovoltaic system shown in Figure 11 are, further comprise bypass branch 1 and bypass
Branch 2.
When the input voltage of three-level Boost converter 1101 is higher than 1103 minimum grid-connected DC voltage of inverter, three
Level Boost converter 1101 does not work, and bypass branch 1 and bypass branch 2 are connected at this time.
The working principle of bypass branch is illustrated with reference to the accompanying drawing.
Referring to Figure 13, which is the schematic diagram for another photovoltaic system that the embodiment of the present application four provides.
In this implementation, bypass branch 1 includes the 4th diode D4, figure including third diode D3, bypass branch 2
In controller and inverter is not shown.The positive input terminal of the anode connection three-level Boost converter of third diode D3, third
The positive output end of the cathode connection three-level Boost converter of diode D3.
The negative output terminal of the anode connection three-level Boost converter of 4th diode D4, the cathode of the 4th diode D4
Connect the negative input end of three-level Boost converter.
The positive output end Vout+ of three-level Boost converter connects photovoltaic DC-to-AC converter with negative output terminal Vout-, works as input
When the minimum grid-connected DC voltage that voltage is less than photovoltaic DC-to-AC converter requires, third diode D3 and the 4th diode D4 are in reversed
The working condition of cut-off, no current flows through in two bypass branch, and the three-level Boost converter work in system is risen with realizing
Pressure and MPPT maximum power point tracking；When the minimum grid-connected DC voltage that input voltage is higher than photovoltaic DC-to-AC converter requires, the three or two pole
Pipe D3 and the 4th diode D4 is in the working condition of forward conduction, and three-level Boost converter does not work at this time, reduces energy
Amount loss.
Referring to Figure 14, which is the schematic diagram for another photovoltaic system that the embodiment of the present application four provides.
In this implementation, bypass branch 1 includes the second relay S2, figure including the first relay S1, bypass branch 2
In controller and inverter is not shown.The positive input terminal of one end connection three-level Boost converter of first relay S1, first
The positive output end of the other end connection three-level Boost converter of relay S1.
The negative output terminal of one end connection three-level Boost converter of second relay S2, the second relay S2's is another
The negative input end of end connection three-level Boost converter.
The positive output end Vout+ of three-level Boost converter connects photovoltaic DC-to-AC converter with negative output terminal Vout-, works as input
When the minimum grid-connected DC voltage that voltage is less than photovoltaic DC-to-AC converter requires, control the first relay S1 and the first relay S2 is in
Off-state, no current flows through in two bypass branch, and the three-level Boost converter work in system is to realize boosting and most
High-power point tracking；When the minimum grid-connected DC voltage that input voltage is higher than photovoltaic DC-to-AC converter requires, the first relay is controlled
S1 and the first relay S2 are in the conductive state, and three-level Boost converter does not work at this time, and bypass relay flows through electric current,
Thus greatly reduce energy loss.
It should be appreciated that in this application, " at least one (item) " refers to one or more, and " multiple " refer to two or two
More than a."and/or" indicates may exist three kinds of relationships, for example, " A and/or B " for describing the incidence relation of affiliated partner
It can indicate: only exist A, only exist B and exist simultaneously tri- kinds of situations of A and B, wherein A, B can be odd number or plural number.Word
Symbol "/" typicallys represent the relationship that forward-backward correlation object is a kind of "or"." at least one of following (a) " or its similar expression, refers to
Any combination in these, any combination including individual event (a) or complex item (a).At least one of for example, in a, b or c
(a) can indicate: a, b, c, " a and b ", " a and c ", " b and c ", or " a and b and c ", and wherein a, b, c can be individually, can also
To be multiple.
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 (12)
1. a kind of three-level Boost converter characterized by comprising integrated coupling reactance, first switch tube, second switch
Pipe, third switching tube and the 4th switching tube, first capacitor and the second capacitor；
The integrated coupling reactance includes the first winding, the second winding and common core, and first winding and the second winding
It is installed in the common core；The positive input terminal of the first end connection converter of first winding, first winding
Second end connect first node；The first end of the third switching tube connects the first node, the third switching tube
Second end connects the positive output end of the converter；
The first end of the first switch tube connects the first node, and the second end of the first switch tube connects the second section
Point, the first end of the second switch connect the second node, and the second end of the second switch connects third node；
The first end of second winding connects the third node, and the second end of second winding connects the converter
Negative input end, the first end of the 4th switching tube connect the negative output terminal, and the second end of the 4th switching tube connects institute
State third node；
The both ends of the first capacitor are separately connected the positive output end and the second node of the converter, second capacitor
Both ends be separately connected the negative output terminal and the second node of the converter；
The first end of first winding and the first end of second winding are Same Name of Ends.
2. converter according to claim 1, which is characterized in that the inductance and the second winding that first winding is presented
The inductance presented is identical.
3. converter according to claim 2, which is characterized in that the number of turns of first winding and second winding
The number of turns is identical.
4. converter according to claim 2, which is characterized in that the material of first winding and second winding
Material is identical.
5. converter according to claim 1, which is characterized in that the first switch tube and second switch are open-minded simultaneously
Or it simultaneously turns off.
6. converter according to claim 5, which is characterized in that further include that the first isolation drive chip and the second isolation are driven
Dynamic chip；
The output end on the first isolation drive chip pair side connects the control terminal of the first switch tube, for controlling described
The switch state of one switching tube；
The output end on the second isolation drive chip pair side connects the control terminal of the second switch, for controlling described
The switch state of two switching tubes；
The corresponding light emitting diode of the first isolation drive chip primary side is corresponding with the second isolation drive chip primary side
The logic control level of driving pulse is connected after light emitting diode series connection.
7. converter according to claim 1-6, which is characterized in that the third switching tube and the 4th switching tube
It is diode；
The anode of the third switching tube connects the first node, and the cathode of the third switching tube connects the positive output
End；The anode of 4th switching tube connects the negative output terminal, and the cathode of the 4th switching tube connects the third node.
8. a kind of control method of three-level Boost converter, which is characterized in that it is controlled applied to the converter,
The converter includes: integrated coupling reactance, first switch tube, second switch, third switching tube and the 4th switching tube, first
Capacitor and the second capacitor；The integrated coupling reactance includes the first winding, the second winding and common core；First winding
First end connects the positive input terminal of converter, and the second end of first winding connects first node；The third switching tube
First end connects the first node, and the second end of the third switching tube connects the positive output end of the converter；Described
The first end connection first node of one switching tube, the second end connection second node of the first switch tube, described second
The first end of switching tube connects the second node, and the second end of the second switch connects third node；Described second around
The first end of group connects the third node, and the second end of second winding connects the negative input end of the converter, described
The first end of 4th switching tube connects the negative output terminal, and the second end of the 4th switching tube connects the third node；Institute
The both ends for stating first capacitor are separately connected the positive output end and the second node of the converter, the both ends of second capacitor
It is separately connected the negative output terminal and the second node of the converter；The first end of first winding and second winding
First end be Same Name of Ends；
This method comprises:
In converter work, controls the first switch tube and second switch while opening or simultaneously turning off.
9. control method according to claim 8, which is characterized in that when the first switch tube and second switch simultaneously
When opening, current path are as follows: the first winding-first switch tube-the-the second winding of second switch；
When the first switch tube and second switch simultaneously turn off, current path are as follows: the first winding-third switch
The-the second capacitor of pipe-first capacitor the-the second winding of the-the four switching tube.
10. a kind of photovoltaic system, which is characterized in that including the described in any item three-level Boost converters of claim 1-7,
Further include: inverter and controller；
The three-level Boost converter, for being sent to the inversion after boosting to the direct current that photovoltaic module exports
Device；
The inverter, the direct current for exporting the three-level Boost converter are converted to alternating current and feed back to exchange
Power grid；
The controller, for controlling the first switch tube and second switch in three-level Boost converter work
It manages while opening or simultaneously turning off.
11. photovoltaic system according to claim 10, which is characterized in that further include: third diode and the 4th diode；
The anode of the third diode connects the positive input terminal of the three-level Boost converter, the third diode
Cathode connects the positive output end of the three-level Boost converter；
The anode of 4th diode connects the negative output terminal of the three-level Boost converter, the 4th diode
Cathode connects the negative input end of the three-level Boost converter.
12. photovoltaic system according to claim 10, which is characterized in that further include: the first relay and the second relay；
One end of first relay connects the positive input terminal of the three-level Boost converter, first relay
The other end connects the positive output end of the three-level Boost converter；
One end of second relay connects the negative output terminal of the three-level Boost converter, second relay
The other end connects the negative input end of the three-level Boost converter；
The controller is also used to when the three-level Boost converter does not work, and controls first relay and second
Relay is closed.
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| CN201910501505.9A CN110098730A (en) | 2019-06-11 | 2019-06-11 | A kind of three-level Boost converter, control method and photovoltaic system |
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|---|---|---|---|
| CN201910501505.9A CN110098730A (en) | 2019-06-11 | 2019-06-11 | A kind of three-level Boost converter, control method and photovoltaic system |
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Cited By (3)
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| CN110994975A (en) * | 2019-12-18 | 2020-04-10 | 阳光电源股份有限公司 | Capacitor clamp type direct current conversion circuit |
| CN115133777A (en) * | 2022-07-22 | 2022-09-30 | 北京雷动智创科技有限公司 | Isolated DC converter and control method |
| CN117129910A (en) * | 2023-10-27 | 2023-11-28 | 锦浪科技股份有限公司 | Open circuit detection method and system for photovoltaic inverter power device |
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