CN107171568A - A kind of three level power unit main circuits and cascade high voltage RHVC - Google Patents
A kind of three level power unit main circuits and cascade high voltage RHVC Download PDFInfo
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- CN107171568A CN107171568A CN201710465088.8A CN201710465088A CN107171568A CN 107171568 A CN107171568 A CN 107171568A CN 201710465088 A CN201710465088 A CN 201710465088A CN 107171568 A CN107171568 A CN 107171568A
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention provides a kind of three level powers unit main circuit, including：Two inlet wire terminal circuits；Two rectification circuits, each rectification circuit respectively with end of incoming cables circuit in parallel described in one；Two filter capacitors, each filter capacitor is in parallel with rectification circuit described in one respectively, described two filter capacitor series connection；One inverter circuit, the inverter circuit is three level H-bridges, and described two filter capacitors are connected in parallel on the direct current input side of three level H-bridge；One outlet terminal circuit, exchange outlet side of the leading-out terminal circuit in parallel in three level H-bridge.Beneficial effects of the present invention：The fluctuation of mid-point voltage can effectively be solved by carrying out rectification using two rectification circuits, eliminate harmonic pollution of the RHVC to power network；Power cell number is less, power cell structure is compacter, power cell is more easily realized and output level number increases, and power cell output harmonic wave is low, so that it is more friendly that motor is insulated.
Description
Technical field
The present invention relates to high-voltage frequency conversion and speed-adjusting device technical field, more particularly to a kind of three level powers unit main circuit and
Cascade high voltage RHVC.
Background technology
With the fast development of Power Electronic Technique, high-voltage frequency conversion and speed-adjusting device is led in electric power, metallurgy, oil, chemical industry etc.
Domain is used widely.High-voltage frequency conversion and speed-adjusting device in the market major product has two current levels source type high-voltage frequency conversion and speed-adjusting dresses
Put, three-level voltage source type RHVC and cascade of power units multi-level high-voltage RHVC.
Because the resistance to voltage levels of individual devices are limited, two current levels source type high-voltage frequency conversion and speed-adjusting devices must use multiple
Devices in series constitutes two traditional level blocks；Because grid side power factor is low, harmonic wave is big, and with operating mode change and
Change, compensation is difficult；Outlet side needs to install wave filter additional, expensive.The market competitiveness of this kind of product gradually dies down.
Three-level voltage source type RHVC due to output voltage it is not high the problem of, be mainly used in some special necks
Domain, such as rolling mill, locomotive traction, elevator.The great development of this kind of arrangements for speed regulation awaits more high withstand voltage power device
Occur.
By the high-voltage frequency conversion and speed-adjusting device of cascade of power units technological maheup, have that harmonic wave is small, unit is interchangeable, can batch
Production, it is easy to maintenance the advantages of, the accreditation in market has been obtained, with good development prospect.
Now widely used unit cascaded high-voltage RHVC, generally using two level H-bridge cascade of power units
Mode, (Fig. 1 is a kind of embodiment to power cell main circuit, and class can be used according to use demand when specifically used as shown in Figure 1
As circuit), it by one group of end of incoming cables 1a, a rectification circuit 2a, one group of capacitor filter 3a, one group of inverter circuit 4a and
One group of leading-out terminal 5a composition.Using two level H-bridge cascade of power units modes, realize that threshold, than relatively low, Technical comparing maturation, is
Many frequency conversion producers and R＆D institution are grasped.But the two usual work(of level H-bridge cascade of power units high-voltage frequency conversion and speed-adjusting device
Rate unit number is more, it is well known that the reliability of RHVC as power cell number increases and substantially reduces, meanwhile,
More power cell make it that the volume of RHVC is larger.
The content of the invention
For problems of the prior art, the present invention provide a kind of power cell be easily achieved, power cell number compared with
Less, compact conformation, with unit output harmonic wave is low, mid-point voltage fluctuation is small, three level powers high to power network close friend, reliability
Unit main circuit and cascade high voltage RHVC.
The present invention is adopted the following technical scheme that：
A kind of three level power unit main circuits, including：
Two inlet wire terminal circuits, each inlet wire terminal circuit is respectively used to export three-phase current；
Two rectification circuits, each three-phase output end of the rectification circuit respectively with inlet wire terminal circuit described in one is coupled；
One inverter circuit, the inverter circuit is three level H-bridges, and described two rectification circuits are connected in parallel on three level
The direct current input side of H bridges；
One outlet terminal circuit, exchange outlet side of the leading-out terminal circuit in parallel in three level H-bridge.
It is preferred that, the inlet wire terminal circuit includes：
One three-phase terminal, the three-phase output end of three-phase terminal is defeated including A phase output terminals, B phases
Go out end and C phase output terminals, the A phase output terminals, the B phase output terminals and the C phase output terminals respectively with the rectification circuit
Coupling；
First fuse, is provided with the first fuse between the A phase output terminals and the rectification circuit；
Second fuse, is provided with the second fuse between the C phase output terminals and the rectification circuit.
It is preferred that, the rectification circuit is the three-phase bridge rectifier circuit being made up of six diodes, the three-phase bridge
Rectification circuit includes the common-anode uncontrollable rectifier circuit that is made up of three diodes and is made up of three diodes
Common cathode uncontrollable rectifier circuit.
It is preferred that, the B phase output terminals connect the common cathode of the common cathode uncontrollable rectifier circuit.
It is preferred that, three level H-bridge includes：
Three level bridge arms of two diode clamps, the three level bridge arm is respectively the first bridge arm and the second bridge arm：
First capacitor bank, first capacitor bank is made up of two DC side energy-storage capacitors, first electric capacity
Device group, first capacitor bank is parallel to first bridge arm, the positive pole of first capacitor bank and first bridge arm
Anode be connected；
Second capacitor bank, second capacitor bank is made up of two DC side energy-storage capacitors, and described second
Capacitor bank is parallel to second bridge arm, and the positive pole of second capacitor bank is connected with the anode of second bridge arm；
First capacitor bank is connected with the neutral point of second capacitor bank；
The midpoint of first bridge arm is connected with the neutral point of first capacitor bank；
The midpoint of second bridge arm is connected with the neutral point of second capacitor bank；First bridge arm and described
The midpoint of two bridge arms constitutes exchange output point.
It is preferred that, the direct current input side of first bridge arm is also parallel with two filter capacitors, described two filter capacitors
Series connection, and the common-anode of the positive pole connection common-anode uncontrollable rectifier circuit of described two filter capacitors, described two filtering
The negative pole of electric capacity connects the common cathode of the common cathode uncontrollable rectifier circuit
It is preferred that, the outlet terminal circuit includes：
One single-phase binding post, the single-phase binding post is connected in first bridge arm and second bridge arm
Point.
A kind of cascade high voltage RHVC, the cascade high voltage RHVC has three described level powers
Unit main circuit.
Beneficial effects of the present invention：Rectification is carried out using two rectification circuits, it is inverse due to the characteristic of tri-level circuit topology
The phenomenon of mid-point voltage fluctuation, the influence of fluctuations filter capacitor of mid-point voltage, the choosing of three level H-bridges occur when becoming circuit work
Type and service life, the fluctuation of mid-point voltage can effectively be solved by carrying out rectification using two rectification circuits；
The phase-shifting rectifier transformer that two rectification circuits can also be designed with the use of multiplex, substantially improves grid side
Current waveform, eliminates harmonic pollution of the RHVC to power network；
Three-level inverter circuit cause power cell number less, power cell structure is compacter, power cell more
It is easily achieved and output level number increases, power cell output harmonic wave is low, so that it is more friendly that motor is insulated.
Brief description of the drawings
Fig. 1 is in the prior art, using the power cell main circuit schematic diagram of two level H-bridge cascade of power units modes；
Fig. 2 be a kind of preferred embodiment of the invention in, the schematic diagram of power cell main circuit.
Embodiment
It should be noted that in the case where not conflicting, following technical proposals can be mutually combined between technical characteristic.
The embodiment to the present invention is further described below in conjunction with the accompanying drawings：
As shown in Fig. 2 a kind of three level powers unit main circuit, including：
Two inlet wire terminal circuit 1b, each above-mentioned inlet wire terminal circuit 1b is respectively used to export three-phase current；
Two rectification circuit 2b, each three-phase output ends of above-mentioned rectification circuit 2b respectively with an above-mentioned inlet wire terminal circuit 1b
Coupling；
One inverter circuit 4b, above-mentioned inverter circuit 4b are three level H-bridges, and above-mentioned two rectification circuit 2b is connected in parallel on above-mentioned
The direct current input side of three level H-bridges；
One outlet terminal circuit 5b, above-mentioned outlet terminal circuit 5b are connected in parallel on the exchange outlet side of above-mentioned three level H-bridge.
In the present embodiment, rectification is carried out using two rectification circuit 2b, due to the characteristic of tri-level circuit topology, inversion
The phenomenon of mid-point voltage fluctuation, the influence of fluctuations filter capacitor of mid-point voltage, the choosing of three level H-bridges occurs in circuit 4b when working
Type and service life, the fluctuation of mid-point voltage can effectively be solved by carrying out rectification using two rectification circuit 2b；
The phase-shifting rectifier transformer that two rectification circuit 2b can also be designed with the use of multiplex, substantially improves grid side
Current waveform, eliminate RHVC to the harmonic pollution of power network；
Three-level inverter circuit 4b cause power cell number less, power cell structure is compacter, power cell more
Plus be easily achieved and output level number increases, power cell output harmonic wave is low, so that it is more friendly that motor is insulated；
Both the problem of traditional three-level voltage source type RHVC output voltage is not high had been solved, and has effectively solved to pass
The problem of two level H-bridge cascade of power units high-voltage frequency conversion and speed-adjusting device power cell numbers of uniting are more
In preferred embodiment, above-mentioned inlet wire terminal circuit 1b includes：
One three-phase terminal, the above-mentioned three-phase output end of above-mentioned three-phase terminal is defeated including A phase output terminals, B phases
Go out end and C phase output terminals, above-mentioned A phase output terminals, above-mentioned B phase output terminals and above-mentioned C phase output terminals respectively with above-mentioned rectification circuit
2b is coupled；
First fuse, is provided with above-mentioned first fuse between above-mentioned A phase output terminals and above-mentioned rectification circuit 2b；
Second fuse, is provided with above-mentioned second fuse between above-mentioned C phase output terminals and above-mentioned rectification circuit 2b.
In the present embodiment, the sub- X1 of three-phase terminal R1, S1, T1 difference corresponding A phase output terminal, B phase output terminals, C phases
Output end, the sub- X1 of three-phase terminal is connected to fuse F1, F3, and the sub- X2 of three-phase terminal R2, S2, T2 distinguish corresponding A and mutually exported
End, B phase output terminals, C phase output terminals, the sub- X2 of three-phase terminal are connected to the fusing in fuse F4, F6, two inlet wire terminal circuit 1b
Device shields, it is ensured that power cell cut-out and connection of transformer when occurring the catastrophe failures such as short circuit, excessively stream.
In preferred embodiment, above-mentioned rectification circuit 2b is the three-phase bridge rectifier circuit 2b being made up of six diodes,
Above-mentioned three-phase bridge rectifier circuit 2b includes the common-anode uncontrollable rectifier circuit 2b being made up of three above-mentioned diodes and by three
The common cathode uncontrollable rectifier circuit 2b that above-mentioned diode is constituted.
In the present embodiment, two rectification circuit 2b constitute uncontrollable rectifier circuit by having 12 diode D1-D12 altogether
2b, is connected to three-phase voltage inlet wire terminal circuit 1b.Rectification is carried out using two rectification circuit 2b, due to the spy of tri-level circuit topology
Property, the phenomenon of mid-point voltage fluctuation, influence of fluctuations filter capacitor, the inversion electricity of mid-point voltage occurs in inverter circuit 4b when working
Road 4b type selecting and service life.Three-level inverter circuit 4b midpoints can effectively be solved by carrying out rectification using two rectification circuit 2b
The fluctuation of voltage.
Another outstanding advantages of two rectification circuit 2b applications are the phase-shifting commutation transformations designed with the use of multiplex
Device, substantially improves the current waveform of net side, substantially eliminates harmonic pollution of the RHVC to power network.
In preferred embodiment, above-mentioned B phase output terminals connect above-mentioned common cathode uncontrollable rectifier circuit 2b common cathode.
In preferred embodiment, above-mentioned three level H-bridge includes：
Three level bridge arms of two diode clamps, above-mentioned three level bridge arm is respectively the first bridge arm and the second bridge arm：
First capacitor bank, above-mentioned first capacitor bank is made up of two DC side energy-storage capacitors, above-mentioned first electric capacity
Device group, above-mentioned first capacitor bank is parallel to above-mentioned first bridge arm, the positive pole of above-mentioned first capacitor bank and above-mentioned first bridge arm
Anode be connected；
Second capacitor bank, above-mentioned second capacitor bank is made up of two above-mentioned DC side energy-storage capacitors, and above-mentioned second
Capacitor bank is parallel to above-mentioned second bridge arm, and the positive pole of above-mentioned second capacitor bank is connected with the anode of above-mentioned second bridge arm；
Above-mentioned first capacitor bank is connected with the neutral point of above-mentioned second capacitor bank；
The midpoint of above-mentioned first bridge arm is connected with the neutral point of above-mentioned first capacitor bank；
The midpoint of above-mentioned second bridge arm is connected with the neutral point of above-mentioned second capacitor bank；Above-mentioned first bridge arm and above-mentioned
The midpoint of two bridge arms constitutes exchange output point.
In the present embodiment, inverter circuit 4b is by IGBT1-IGBT8 totally 8 insulated gate bipolar transistor (Insulated
Gate Bipolar Transistor, IGBT) and D13-D16 level H-bridges of totally 4 diodes composition diode neutral point clamp three；
Inverter circuit 4b is provided with SNB1-SNB4 totally 4 Absorption Capacitances, and Absorption Capacitance is connected in parallel on P, M, M, N2 end respectively；Above-mentioned inversion electricity
Road 4b output end is connected to leading-out terminal.Three-level inverter circuit 4b application so that power cell structure is compacter, power
Unit is easily achieved.
Using the level H-bridge inverter circuit 4b of diode neutral point clamp three, three level electricity can also be solved by unit cascaded
The problem of potential source type RHVC output voltage is not high.
Three level H-bridge inverter circuit 4b application so that power cell structure is compacter, power cell is easily achieved,
Power cell output level number increases, and power cell output harmonic wave is low, so that more friendly, the application of the application of being insulated to motor,
The unit number of high-voltage frequency conversion and speed-adjusting device is greatly decreased, volume reduces, and can greatly enhance the reliability of system.
In preferred embodiment, the direct current input side of above-mentioned first bridge arm is also parallel with two filter capacitors, above-mentioned two
Filter capacitor is connected, and the above-mentioned common-anode uncontrollable rectifier circuit 2b of positive pole connection of above-mentioned two filter capacitor common-anode, on
The negative pole for stating two filter capacitors connects above-mentioned common cathode uncontrollable rectifier circuit 2b common cathode
In the present embodiment, above-mentioned inverter circuit 4b input is connected on filter capacitor, above-mentioned C1, C2 totally two
Group filter capacitor is connected in parallel on correspondence rectification circuit 2b output end respectively, and two groups of filter capacitors are connected in series, during practical application, often
The corresponding above-mentioned filter capacitor of individual rectification circuit 2b can be replaced by capacitor filter 3b, and capacitor filter 3b can be by several
Electrolytic capacitor is connect by series and parallel and obtained, i.e. capacitor filter 3b can also use nonpolarity using electrochemical capacitor
Thin-film capacitor, according to actual needs, the capacitor bank of needs is combined into by the series, parallel of electric capacity.
Inverter circuit 4b is connected in parallel on P, M respectively provided with 4 Absorption Capacitances, Absorption Capacitance, and M, N2 end, absorbing circuit are mainly used
In the overvoltage for absorbing IGBT conducting moment generations, IGBT device is played a protective role.
The influence of fluctuations filter capacitor of three-level inverter circuit 4b mid-point voltages, IGBT type selecting and service life, are used
Two rectification circuit 2b, which carry out rectification, can effectively solve the fluctuation of mid-point voltage.
In preferred embodiment, above-mentioned filter capacitor is polarized electrode.
In preferred embodiment, above-mentioned outlet terminal circuit 5b includes：
One single-phase binding post of X3, above-mentioned single-phase binding post is connected in above-mentioned first bridge arm and above-mentioned second bridge arm
Point.
A kind of cascade high voltage RHVC, above-mentioned cascade high voltage RHVC has three above-mentioned level powers
Unit main circuit.
By explanation and accompanying drawing, the exemplary embodiments of the specific structure of embodiment are given, based on essence of the invention
God, can also make other conversions.Although foregoing invention proposes existing preferred embodiment, however, these contents are not intended as
Limitation.
For a person skilled in the art, read after described above, various changes and modifications undoubtedly will be evident.
Therefore, appended claims should regard whole variations and modifications of the true intention and scope that cover the present invention as.In power
Any and all scope and content of equal value, are all considered as still belonging to the intent and scope of the invention in the range of sharp claim.
Claims (8)
1. a kind of three level powers unit main circuit, it is characterised in that including：
Two inlet wire terminal circuits, each inlet wire terminal circuit is respectively used to export three-phase current；
Two rectification circuits, each three-phase output end of the rectification circuit respectively with inlet wire terminal circuit described in one is coupled；
One inverter circuit, the inverter circuit is three level H-bridges, and described two rectification circuits are connected in parallel on three level H-bridge
Direct current input side；
One outlet terminal circuit, exchange outlet side of the leading-out terminal circuit in parallel in three level H-bridge.
2. three level powers unit main circuit according to claim 1, it is characterised in that the inlet wire terminal circuit includes：
One three-phase terminal, the three-phase output end of three-phase terminal includes A phase output terminals, B phase output terminals
And C phase output terminals, the A phase output terminals, the B phase output terminals and the C phase output terminals are coupled with the rectification circuit respectively；
First fuse, is provided with the first fuse between the A phase output terminals and the rectification circuit；
Second fuse, is provided with the second fuse between the C phase output terminals and the rectification circuit.
3. three level powers unit main circuit according to claim 2, it is characterised in that the rectification circuit is by six
The three-phase bridge rectifier circuit that diode is constituted, the three-phase bridge rectifier circuit is included by being total to that three diodes are constituted
Anode uncontrollable rectifier circuit and the common cathode uncontrollable rectifier circuit being made up of three diodes.
4. three level powers unit main circuit according to claim 3, it is characterised in that the B phase output terminals connect institute
State the common cathode of common cathode uncontrollable rectifier circuit.
5. three level powers unit main circuit according to claim 1, it is characterised in that three level H-bridge includes：
Three level bridge arms of two diode clamps, the three level bridge arm is respectively the first bridge arm and the second bridge arm：
First capacitor bank, first capacitor bank is made up of two DC side energy-storage capacitors, first capacitor bank,
First capacitor bank is parallel to first bridge arm, the anode of the positive pole of first capacitor bank and first bridge arm
It is connected；
Second capacitor bank, second capacitor bank is made up of two DC side energy-storage capacitors, second electric capacity
Device group is parallel to second bridge arm, and the positive pole of second capacitor bank is connected with the anode of second bridge arm；
First capacitor bank is connected with the neutral point of second capacitor bank；
The midpoint of first bridge arm is connected with the neutral point of first capacitor bank；
The midpoint of second bridge arm is connected with the neutral point of second capacitor bank；First bridge arm and second bridge
The midpoint of arm constitutes exchange output point.
6. three level powers unit main circuit according to claim 5, it is characterised in that the direct current of first bridge arm is defeated
Enter the positive pole connection institute that side is also parallel with two filter capacitors, described two filter capacitor series connection, and described two filter capacitors
The common-anode of common-anode uncontrollable rectifier circuit is stated, the negative pole of described two filter capacitors connects the common cathode uncontrollable rectifier circuit
Common cathode.
7. three level powers unit main circuit according to claim 5, it is characterised in that the outlet terminal circuit includes：
One single-phase binding post, the single-phase binding post connects the midpoint of first bridge arm and second bridge arm.
8. a kind of cascade high voltage RHVC, the cascade high voltage RHVC has as appointed in claim 1-7
Three level power unit main circuits described in meaning one.
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| CN201710465088.8A CN107171568A (en) | 2017-06-19 | 2017-06-19 | A kind of three level power unit main circuits and cascade high voltage RHVC |
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| CN201710465088.8A CN107171568A (en) | 2017-06-19 | 2017-06-19 | A kind of three level power unit main circuits and cascade high voltage RHVC |
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Cited By (1)
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| CN109245663A (en) * | 2018-09-06 | 2019-01-18 | 西南交通大学 | A kind of multidimensional pressure equalising space vector modulation method suitable for single-phase cascade converter |
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