CN109120177A - A kind of three-phase multi-electrical level inverter - Google Patents
A kind of three-phase multi-electrical level inverter Download PDFInfo
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- CN109120177A CN109120177A CN201811310493.3A CN201811310493A CN109120177A CN 109120177 A CN109120177 A CN 109120177A CN 201811310493 A CN201811310493 A CN 201811310493A CN 109120177 A CN109120177 A CN 109120177A
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- tube
- inductance
- electrical level
- level inverter
- phase
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a kind of three-phase multi-electrical level inverter, the three-phase multi-electrical level inverter includes two DC side filter capacitors and a three-phase bridge arm；Every phase bridge arm includes first switch tube, second switch, third switching tube, the 4th switching tube, intermediate switch device, the first clamper tube, the second clamper tube, the first inductance and the second inductance；Three-phase multi-electrical level inverter of the invention additionally introduces an intermediate switch device in every phase bridge arm, the only current stream of first inductance and second inductance provides channel, and avoid bridge arm direct pass phenomenon, therefore switching drive signal is not necessarily to dead time, the problem of there is no the distortion of output waveform caused by dead zone, improves system reliability.
Description
Technical field
The present invention relates to inverter field, in particular to a kind of three-phase multi-electrical level inverter.
Background technique
Three-phase multi-electrical level inverter is widely used in industrial circle, compared with two-level inverter, is had the advantages that 1)
The voltage stress that power device is born is low；2) harmonic content of output waveform reduces；3) dv/dt of inverter is reduced, and electromagnetism is dry
Disturb reduction.Multi-electrical level inverter has been widely used for mesohigh photovoltaic generating system at present.However in practical application, solar energy
There are common mode circuits between solar panel, photovoltaic DC-to-AC converter and power grid, and the high frequency common mode voltage that inverter generates will be in system common-mode
Circuit generates high-frequency harmonic electric current, and system is caused electromagnetic interference problem occur.In order to solve this problem, Brazilian scholar in 2010
The paper that M.C.Cavalcanti professor et al. delivers in IEEE Transactions on Industrial Electronics
Modulation techniques to eliminate leakage currents in transformerless three-
In phase photovoltaic systems, by improving the method modulated, three odd vectors or three are utilized
Evenvectors synthesized reference vector is to solve the problems, such as that system common-mode voltage high frequency changes, but three-phase photovoltaic inverter exports
Voltage vector is restricted, and DC voltage utilization rate is lower, and industrial application is limited.In addition, the modulator approach uses space vector
Modulation is realized complex.On the other hand, by changing effective way that inverter circuit structure is reduction system electromagnetic interference
Diameter.University On The Mountain Of Swallows Guo little Qiang teach seminar in IEEE Transactions on Industrial Electronics and
IEEE Transactions on Power Electronics proposes a variety of improvement inverters, such as three-phase ESI
Inverter, three-phase cascaded H5 inverter, three-phase ZVR inverter etc., effectively subtracts
The small electromagnetic interference of photovoltaic system.However, inverter has the phenomenon that bridge arm direct pass in above scheme, system is reduced
Reliability.
Summary of the invention
The object of the present invention is to provide a kind of three-phase multi-electrical level inverter, the phenomenon that avoid bridge arm direct pass, system is improved
Reliability.
To achieve the above object, the present invention provides following schemes:
A kind of three-phase multi-electrical level inverter, the three-phase multi-electrical level inverter include two DC side filter capacitors and one
Three-phase bridge arm；
Two DC side filter capacitors are connected in series in O point, and the one of two DC side filter capacitors of series connection
It holds and is connect with the anode of DC power supply, the other end of two DC side filter capacitors of series connection and bearing for the DC power supply
Pole connection；
Every phase bridge arm include first switch tube, second switch, third switching tube, the 4th switching tube, intermediate switch device,
First clamper tube, the second clamper tube, the first inductance and the second inductance；
The anode of one end of the first switch tube and the DC power supply connect, the other end of the first switch tube and
One end of the second switch connects, and the other end of the second switch is connect with one end of the intermediate switch device,
The other end of the intermediate switch device is connect with one end of the third switching tube, the other end of the third switching tube and institute
One end connection of the 4th switching tube is stated, the other end of the 4th switching tube is connect with the cathode of the DC power supply；
One end of first clamper tube is connect with the other end of the first switch tube, first clamper tube it is another
End and one end of second clamper tube are connected to O point, and the other end of second clamper tube is another with the third switching tube
One end connection；
One end of first inductance is connect with one end of the intermediate switch device, the other end of first inductance with
One end of second inductance connects, and the other end of second inductance is connect with the other end of the intermediate switch device, institute
The tie point for stating the first inductance and second inductance is the output end of the bridge arm.
Optionally, the multi-electrical level inverter further includes three exchange side filter capacitors, three exchange side filtered electricals
One end of appearance is connect with the output end of the three-phase bridge arm respectively, and the other end of three exchange side filter capacitors connects jointly
In M point.
Optionally, the M point is connect with the cathode of the DC power supply.
Optionally, the intermediate switch device is switching tube.
Optionally, the intermediate switch device is silicon carbide diode.
Optionally, the intermediate switch device is synchronous rectification device.
Optionally, first inductance intercouples with second inductance.
Optionally, first clamper tube and second clamper tube are switching tube.
The specific embodiment provided according to the present invention, the invention discloses following technical effects:
The invention discloses a kind of three-phase multi-electrical level inverter, the three-phase multi-electrical level inverter includes two DC side filters
Wave capacitor and a three-phase bridge arm；Every phase bridge arm include first switch tube, second switch, third switching tube, the 4th switching tube,
Intermediate switch device, the first clamper tube, the second clamper tube, the first inductance and the second inductance；Three-phase multi-level inverse conversion of the invention
Device additionally introduces an intermediate switch device in every phase bridge arm, and the electric current of only not described first inductance and second inductance is continuous
Stream provides channel, and avoids bridge arm direct pass phenomenon, therefore switching drive signal is not necessarily to dead time, and there is no dead zones to draw
The problem of output waveform distortion risen, improve system reliability.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of circuit diagram of a kind of embodiment of three-phase multi-electrical level inverter provided by the invention；
Fig. 2 is a kind of circuit diagram of the another embodiment of three-phase multi-electrical level inverter provided by the invention；
Fig. 3 is a kind of equivalent circuit diagram in the common mode circuit of three-phase multi-electrical level inverter provided by the invention.
Specific embodiment
The object of the present invention is to provide a kind of three-phase multi-electrical level inverter, the phenomenon that avoid bridge arm direct pass, system is improved
Reliability.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Mode is applied to be described in further detail invention.
As shown in Figure 1, the present invention provides a kind of a kind of embodiment of three-phase multi-electrical level inverter, the more level of three-phase
Inverter includes two DC side filter capacitors and three-phase bridge arm.
Two DC side filter capacitors are respectively Cd1, Cd2.
The multi-level inverse conversion further includes three exchange side filter capacitors, respectively Cf1, Cf2, Cf3.
The first switch tube of A phase bridge arm, second switch, third switching tube, the 4th switching tube, intermediate switch device,
One clamper tube, the second clamper tube, the first inductance and the second inductance are respectively S1, S2, S3, S4, S13, S16, S17, L1 and L2.
The first switch tube of B phase bridge arm, second switch, third switching tube, the 4th switching tube, intermediate switch device,
One clamper tube, the second clamper tube, the first inductance and the second inductance are respectively S5, S6, S7, S8, S14, S18, S19, L3 and L4.
The first switch tube of C phase bridge arm, second switch, third switching tube, the 4th switching tube, intermediate switch device,
One clamper tube, the second clamper tube, the first inductance and the second inductance be respectively S9, S10, S11, S12, S15, S20, S21, L5 and
L6。
The anode of DC power supply and one end of Cd1 are connected to " P " point, " P " point and the one of the first switch tube S1 of A phase bridge arm
End, B phase bridge arm first switch tube S5 one end and C phase bridge arm first switch tube S9 one end connection.
The cathode of DC power supply and the other end of Cd2 are connected to " N " point, and " N " is put with the 4th switching tube S4's of A phase bridge arm
The other end, B phase bridge arm the 4th switching tube S8 the other end and C phase bridge arm the 4th switching tube S12 the other end connection.
The other end of Cd1 and one end of Cd2 are connected to " O " point.
First switch tube S1 and second switch S2, intermediate switch device S13, the third switching tube S3, the 4th of A phase bridge arm
Switching tube S4 is sequentially connected with, one end and the other end of second switch S2, one end of intermediate switch device S13 of the first inductance L1
Connection, one end of the second inductance L2 are connect with one end of the other end of intermediate switch device S13, third switching tube S3, the first pincers
One end of position pipe is connect with one end of the other end of first switch tube S1, second switch S2, the other end of the second clamper tube S17
It is connect with one end of the other end of third switching tube S3, the 4th switching tube S4, the other end and the second clamper of the first clamper tube S16
One end of pipe S17 is connected to " O " point.
The other end of the other end of first inductance L1 and the second inductance L2, Cf1 one end be connected to " A " point.
First switch tube S5 and second switch S6, intermediate switch device S14, the third switching tube S7, the 4th of B phase bridge arm
Switching tube S8 is sequentially connected with, one end and the other end of second switch S6, one end of intermediate switch device S14 of the first inductance L3
Connection, one end of the second inductance L4 are connect with one end of the other end of intermediate switch device S14, third switching tube S7, the first pincers
One end of position pipe is connect with one end of the other end of first switch tube S5, second switch S6, the other end of the second clamper tube S19
It is connect with one end of the other end of third switching tube S7, the 4th switching tube S8, the other end and the second clamper of the first clamper tube S18
One end of pipe S19 is connected to " O " point.
The other end of the other end of first inductance L3 and the second inductance L4, Cf2 one end be connected to " B " point.
First switch tube S9 and second switch S10, intermediate switch device S15, the third switching tube S11, of C phase bridge arm
Four switching tube S12 are sequentially connected with, the other end of one end of the first inductance L5 and second switch S10, intermediate switch device S15
One end connection, one end of the second inductance L6 are connect with one end of the other end of intermediate switch device S15, third switching tube S11, the
One end of one clamper tube S20 is connect with one end of the other end of first switch tube S9, second switch S10, the second clamper tube S21
The other end connect with one end of the other end of third switching tube S11, the 4th switching tube S12, the other end of the first clamper tube S20
" O " point is connected to one end of the second clamper tube S21.
The other end of the other end of first inductance L5 and the second inductance L6, Cf3 one end be connected to " C " point.
The other end of the other end of Cf1 and Cf2, Cf3 the other end be connected to " M " point.
" A " point, " B " point and " C " point are the output end of the three-phase multi-electrical level inverter.
Wherein, the first inductance L1 and the second inductance L2 of A phase bridge arm intercouple, the first inductance L3 of B phase bridge arm
It intercouples with the second inductance L4, the first inductance L5 and the second inductance L6 of C phase bridge arm intercouple, and can reduce
Inductance.
By selecting suitable device to substitute intermediate switch device S13, intermediate switch device S14 and intermediate switch device
S15 either applies suitable control letter to intermediate switching device S13, intermediate switch device S14 and intermediate switch device S15
Number, dead time can not be needed to avoid bridge arm direct pass phenomenon, driving signal, therefore can be to avoid dead time to output waveform
Influence.
The first inductance to be intercoupled from circuit structure due to traditional filter inductance and the second inductance are replaced,
And coupling inductance both ends are connect with intermediate switch device respectively, are respectively intermediate switch device S13, intermediate switch in Fig. 1
Device S14 and intermediate switch device S15, therefore when inductive current afterflow, intermediate switch device S13, intermediate switch can be passed through
Device S14 and intermediate switch device S15 carries out afterflow, and the loss for reducing system improves system whole efficiency.As shown in Figure 1,
Due to the presence of first clamper tube S16, S18, S20, second clamper tube S17, S19, S21, make A phase bridge arm, B phase bridge arm, C phase bridge
There are three level for the output voltage of arm :+E, 0 ,-E.Therefore, under same switch frequency, the harmonic content of output waveform is reduced,
The voltage stress that power device is born is the half of DC side.
Control is not triggered under intermediate switch device S13, S14, S15 normal condition of the invention, utilizes its two pole of inverse parallel
The conducting and afterflow of pipe realization device.When other devices break down, defective device is bypassed, controls trigger action, is realized
System Fault Tolerance control, improves system reliability.
As shown in Fig. 2, the another embodiment of three-phase multi-electrical level inverter of the invention.The circuit knot of the embodiment
Structure and the circuit structure of the first embodiment of the invention are essentially identical, distinguish " N " point and " M " being in the embodiment
Point connection.
The common mode leakage current of system depends primarily on common-mode voltage and common mode impedance loop, due to another kind of the present invention
" N " point is connected with " M " point in embodiment, is introduced shunt capacitance in the output end of the three-phase multi-electrical level inverter, is changed
The impedance in common mode circuit.According to Fig.3, equivalent inductance of the Inductor in common mode circuit is indicated with L, solar-electricity
The parasitic capacitance of pond plate over the ground indicates that common-mode voltage is indicated with Ucm with Cpv, compared with the common mode circuit of traditional circuit topology, this
Equivalent capacity (the Cf1+Cf2+ in parallel with parasitic capacitance Cpv is introduced in the common mode circuit of the three-phase multi-electrical level inverter of invention
Cf3), the impedance in common mode circuit is increased, in the case that common-mode voltage variation amplitude is certain in common mode circuit, common mode leakage current
Amplitude reduce, thus achieve the purpose that inhibit common mode leakage current.By the reasonable value of Cf1, Cf2 and Cf3, make common-mode voltage
High fdrequency component decaying, common mode leakage current reduces, and the specific capacitance of Cf1, Cf2 and Cf3 determines according to actual needs.
The intermediate switch device be switching tube when, the intermediate switch device be silicon carbide diode when and it is described in
Between switching device be synchronous rectification device may make up three kinds of different schemes again.
The specific embodiment provided according to the present invention, the invention discloses following technical effects:
Three-phase multi-electrical level inverter of the invention additionally introduces an intermediate switch device in every phase bridge arm, not only inductance
Current stream provides channel, and avoids bridge arm direct pass phenomenon, therefore switching drive signal is not necessarily to dead time, is not present
The problem of output waveform caused by dead zone distorts, system reliability are high.Meanwhile the impedance by increasing system common-mode circuit, have
Effect reduces the amplitude of common mode leakage current, and system common-mode characteristic is improved, and solves system electricity while improving system effectiveness
Magnetic disturbance problem.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Specific examples are used herein to describe the principles and implementation manners of the present invention, the explanation of above embodiments
Method and its core concept of the invention are merely used to help understand, described embodiment is only that a part of the invention is real
Example is applied, instead of all the embodiments, based on the embodiments of the present invention, those of ordinary skill in the art are not making creation
Property labour under the premise of every other embodiment obtained, shall fall within the protection scope of the present invention.
Claims (8)
1. a kind of three-phase multi-electrical level inverter, which is characterized in that the three-phase multi-electrical level inverter includes two DC side filtering
Capacitor and a three-phase bridge arm；
Two DC side filter capacitors are connected in series in O point, one end of two DC side filter capacitors of series connection with
The anode connection of DC power supply, the other end of two DC side filter capacitors of series connection and the cathode of the DC power supply connect
It connects；
Every phase bridge arm includes first switch tube, second switch, third switching tube, the 4th switching tube, intermediate switch device, first
Clamper tube, the second clamper tube, the first inductance and the second inductance；
The anode of one end of the first switch tube and the DC power supply is connect, the other end of the first switch tube with it is described
One end of second switch connects, and the other end of the second switch is connect with one end of the intermediate switch device, described
The other end of intermediate switch device is connect with one end of the third switching tube, the other end of the third switching tube and described the
One end of four switching tubes connects, and the other end of the 4th switching tube is connect with the cathode of the DC power supply；
One end of first clamper tube is connect with the other end of the first switch tube, the other end of first clamper tube with
One end of second clamper tube is connected to O point, the other end of the other end of second clamper tube and the third switching tube
Connection；
One end of first inductance is connect with one end of the intermediate switch device, the other end of first inductance with it is described
One end of second inductance connects, and the other end of second inductance is connect with the other end of the intermediate switch device, and described the
The tie point of one inductance and second inductance is the output end of the bridge arm.
2. a kind of three-phase multi-electrical level inverter according to claim 1, which is characterized in that the multi-electrical level inverter also wraps
Three exchange side filter capacitors are included, one end of three exchange side filter capacitors connects with the output end of the three-phase bridge arm respectively
It connects, the other end of three exchange side filter capacitors is commonly connected to M point.
3. a kind of three-phase multi-electrical level inverter according to claim 2, which is characterized in that the M point and the direct current
The cathode in source connects.
4. a kind of three-phase multi-electrical level inverter according to claim 1, which is characterized in that the intermediate switch device is to open
Guan Guan.
5. a kind of three-phase multi-electrical level inverter according to claim 1, which is characterized in that the intermediate switch device is carbon
SiClx diode.
6. a kind of three-phase multi-electrical level inverter according to claim 1, which is characterized in that the intermediate switch device is same
Walk rectifying device.
7. a kind of three-phase multi-electrical level inverter according to claim 1, which is characterized in that first inductance and described the
Two inductance intercouple.
8. a kind of three-phase multi-electrical level inverter according to claim 1, which is characterized in that first clamper tube and described
Second clamper tube is switching tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811310493.3A CN109120177A (en) | 2018-11-06 | 2018-11-06 | A kind of three-phase multi-electrical level inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811310493.3A CN109120177A (en) | 2018-11-06 | 2018-11-06 | A kind of three-phase multi-electrical level inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111740630A (en) * | 2020-07-07 | 2020-10-02 | 河北申科电力股份有限公司 | High-voltage high-power converter module and control method thereof |
| CN115987127A (en) * | 2023-02-16 | 2023-04-18 | 燕山大学 | Improved transformer-free three-phase multi-level inverter and control method thereof |
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| CN108683345A (en) * | 2018-07-13 | 2018-10-19 | 南京德汇电气有限责任公司 | A kind of double Buck/Boost current transformers of three-phase modified based on SiC diodes |
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| CN111740630B (en) * | 2020-07-07 | 2021-10-22 | 河北申科电力股份有限公司 | High-voltage high-power converter module and control method thereof |
| CN115987127A (en) * | 2023-02-16 | 2023-04-18 | 燕山大学 | Improved transformer-free three-phase multi-level inverter and control method thereof |
| CN115987127B (en) * | 2023-02-16 | 2023-09-19 | 燕山大学 | Improved three-phase multi-level inverter without transformer and control method thereof |
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