CN208028779U - Three level power unit main circuits of one kind and cascade high voltage frequency converter - Google Patents
Three level power unit main circuits of one kind and cascade high voltage frequency converter Download PDFInfo
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- CN208028779U CN208028779U CN201720712939.XU CN201720712939U CN208028779U CN 208028779 U CN208028779 U CN 208028779U CN 201720712939 U CN201720712939 U CN 201720712939U CN 208028779 U CN208028779 U CN 208028779U
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Abstract
The utility model provides a kind of three level power unit main circuits, including：Two inlet wire terminal circuits；Two rectification circuits, each rectification circuit respectively with an end of incoming cables circuit in parallel；Two filter capacitors, each filter capacitor is in parallel with a rectification circuit respectively, described two filter capacitor series connection；One inverter circuit, the inverter circuit are 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.The beneficial effects of the utility model：The fluctuation of mid-point voltage can effectively be solved by carrying out rectification using two rectification circuits, eliminate harmonic pollution of the frequency converter to power grid；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, more friendly to insulate to motor.
Description
Technical field
The utility model is related to high-voltage frequency conversion and speed-adjusting device technical fields, more particularly to a kind of three main electricity of level power unit
Road and cascade high voltage frequency converter.
Background technology
With the fast development of power electronic technique, high-voltage frequency conversion and speed-adjusting device is in necks such as electric power, metallurgy, oil, chemical industry
It is used widely in domain.Major product has two current levels source type high-voltage frequency conversion and speed-adjusting dresses to high-voltage frequency conversion and speed-adjusting device in the market
It sets, three-level voltage source type frequency converter and cascade of power units multi-level high-voltage frequency converter.
Since 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；Since grid side power factor is low, harmonic wave is big, and with the variation of operating mode and
Variation, compensation are difficult；Outlet side needs to install filter additional, expensive.The market competitiveness of this kind of product gradually dies down.
Three-level voltage source type frequency converter is mainly used in some special necks due to the not high problem of output voltage
Domain, such as rolling mill, locomotive traction, elevator.The great development of this kind of speed regulation device is up for higher Breakdown Voltage Power device
Occur.
By the high-voltage frequency conversion and speed-adjusting device of cascade of power units technological maheup, have harmonic wave is small, unit is interchangeable, can batch
The advantages that producing, is easy to maintain, has obtained the approval in market, has good development prospect.
Now widely used unit cascaded high-voltage frequency converter generally uses 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 is relatively low, Technical comparing is ripe, 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 frequency converter as power cell number increases and substantially reduces, meanwhile,
More power cell makes the volume of frequency converter larger.
Utility model content
For problems of the prior art, the utility model provide a kind of power cell be easily achieved, power cell
Number is less, compact-sized, and with unit output harmonic wave, low, mid-point voltage fluctuates three level small, that friendly to power grid, reliability is high
Power cell main circuit and cascade high voltage frequency converter.
The utility model adopts the following technical solution：
A kind of three level power unit main circuits, including：
Two inlet wire terminal circuits, each inlet wire terminal circuit are respectively used to output three-phase current；
Two rectification circuits, each rectification circuit are coupled with the three-phase output end of an inlet wire terminal circuit respectively；
One inverter circuit, the inverter circuit are 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.
Preferably, the inlet wire terminal circuit includes：
One three-phase terminal, the three-phase output end of three-phase terminal include that A phase output terminals, B phases are defeated
Outlet 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 equipped with the first fuse between the A phase output terminals and the rectification circuit；
Second fuse is equipped with the second fuse between the C phase output terminals and the rectification circuit.
Preferably, the rectification circuit is the three-phase bridge rectifier circuit being made of six diodes, the three-phase bridge
Rectification circuit includes the common-anode uncontrollable rectifier circuit being made of three diodes and is made of three diodes
Common cathode uncontrollable rectifier circuit.
Preferably, the B phase output terminals connect the common cathode of the common cathode uncontrollable rectifier circuit.
Preferably, three level H-bridge includes：
Three level bridge arms of two diode clamps, the three level bridge arm are respectively the first bridge arm and the second bridge arm：
First capacitor group, the first capacitor group are made of two DC side energy-storage capacitors, first capacitance
Device group, the first capacitor group are parallel to first bridge arm, anode and first bridge arm of the first capacitor group
Anode be connected；
Second capacitor group, the second capacitor group are made of two DC side energy-storage capacitors, and described second
Capacitor group is parallel to second bridge arm, and the anode of the second capacitor group is connected with the anode of second bridge arm；
The first capacitor group is connected with the neutral point of the second capacitor group；
The midpoint of first bridge arm is connected with the neutral point of the first capacitor group；
The midpoint of second bridge arm is connected with the neutral point of the second capacitor group；First bridge arm and described
The midpoint of two bridge arms constitutes exchange output point.
Preferably, there are two filter capacitor, described two filter capacitors for the also parallel connection of the direct current input side of first bridge arm
Series connection, and the anode of described two filter capacitors connects the common-anode of the common-anode uncontrollable rectifier circuit, described two filtering
The cathode of capacitance connects the common cathode of the common cathode uncontrollable rectifier circuit
Preferably, the outlet terminal circuit includes：
One single-phase connecting terminal, the single-phase connecting terminal connect in first bridge arm and second bridge arm
Point.
A kind of cascade high voltage frequency converter, the cascade high voltage frequency converter have three level powers
Unit main circuit.
The beneficial effects of the utility model：Rectification is carried out using two rectification circuits, due to the spy of tri-level circuit topology
Property, inverter circuit will appear the phenomenon that mid-point voltage fluctuates, the influence of fluctuations filter capacitor of mid-point voltage, three level H when working
The type selecting and service life of bridge, the fluctuation of mid-point voltage can effectively be solved by carrying out rectification using two rectification circuits；
Two rectification circuits can also be used cooperatively the phase-shifting rectifier transformer of multiplex design, substantially improve grid side
Current waveform eliminates harmonic pollution of the frequency converter to power grid；
Three-level inverter circuit make 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, more friendly to insulate to motor.
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 is the schematic diagram of power cell main circuit in a kind of preferred embodiment of the utility model.
Specific implementation mode
It should be noted that in the absence of conflict, following technical proposals can be combined with each other between technical characteristic.
Specific embodiment of the present utility model is further described below in conjunction with the accompanying drawings：
As shown in Fig. 2, a kind of three level power unit main circuits, including：
Two inlet wire terminal circuit 1b, each above-mentioned inlet wire terminal circuit 1b are respectively used to output three-phase current；
Two rectification circuit 2b, each above-mentioned rectification circuit 2b three-phase output end with an above-mentioned inlet wire terminal circuit 1b respectively
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 that will appear mid-point voltage fluctuation when circuit 4b work, the choosing of the influence of fluctuations filter capacitor, three level H-bridges of mid-point voltage
Type and service life, the fluctuation of mid-point voltage can effectively be solved by carrying out rectification using two rectification circuit 2b；
Two rectification circuit 2b can also be used cooperatively the phase-shifting rectifier transformer of multiplex design, substantially improve grid side
Current waveform, eliminate frequency converter to the harmonic pollution of power grid；
Three-level inverter circuit 4b make power cell number less, power cell structure is compacter, power cell more
Add and be easily achieved and output level number increases, power cell output harmonic wave is low, more friendly to insulate to motor；
Not only it had solved the problems, such as that traditional three-level voltage source type frequency converter output voltage was not high, but also has effectively solved to pass
It unites the more problem of two level H-bridge cascade of power units high-voltage frequency conversion and speed-adjusting device power cell numbers
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 include that A phase output terminals, B phases are defeated
Outlet 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 equipped with above-mentioned first fuse between above-mentioned A phase output terminals and above-mentioned rectification circuit 2b；
Second fuse is equipped with above-mentioned second fuse between above-mentioned C phase output terminals and above-mentioned rectification circuit 2b.
In the present embodiment, R1, S1, T1 difference corresponding A phase output terminal of the sub- X1 of three-phase terminal, B phase output terminals, C phases
Output end, the sub- X1 of three-phase terminal are connected to fuse F1, F3, and R2, S2, T2 of the sub- X2 of three-phase terminal distinguish corresponding A and mutually export
End, B phase output terminals, C phase output terminals, the sub- X2 of three-phase terminal are connected to fuse F4, F6, the fusing in two inlet wire terminal circuit 1b
Device shields, it is ensured that the connection of power cell cut-out and transformer when the catastrophe failures such as short circuit, overcurrent occur.
In preferred embodiment, above-mentioned rectification circuit 2b is the three-phase bridge rectifier circuit 2b being made of six diodes,
Above-mentioned three-phase bridge rectifier circuit 2b includes the common-anode uncontrollable rectifier circuit 2b being made 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 form 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, inverter circuit 4b will appear the phenomenon that mid-point voltage fluctuates, influence of fluctuations filter capacitor, the inversion electricity of mid-point voltage when working
The type selecting and service life of road 4b.The midpoints three-level inverter circuit 4b 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 with the use of multiplex design
Device substantially improves the current waveform of net side, substantially eliminates harmonic pollution of the frequency converter to power grid.
In preferred embodiment, above-mentioned B phase output terminals connect the common cathode of above-mentioned common cathode uncontrollable rectifier circuit 2b.
In preferred embodiment, above-mentioned three level H-bridge includes：
Three level bridge arms of two diode clamps, above-mentioned three level bridge arm are respectively the first bridge arm and the second bridge arm：
First capacitor group, above-mentioned first capacitor group are made of two DC side energy-storage capacitors, above-mentioned first capacitance
Device group, above-mentioned first capacitor group are parallel to above-mentioned first bridge arm, anode and above-mentioned first bridge arm of above-mentioned first capacitor group
Anode be connected；
Second capacitor group, above-mentioned second capacitor group are made of two above-mentioned DC side energy-storage capacitors, and above-mentioned second
Capacitor group is parallel to above-mentioned second bridge arm, and the anode of above-mentioned second capacitor group is connected with the anode of above-mentioned second bridge arm；
Above-mentioned first capacitor group is connected with the neutral point of above-mentioned second capacitor group；
The midpoint of above-mentioned first bridge arm is connected with the neutral point of above-mentioned first capacitor group；
The midpoint of above-mentioned second bridge arm is connected with the neutral point of above-mentioned second capacitor group；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 three level H-bridges of totally 4 diodes composition diode neutral point clamp；
Inverter circuit 4b is equipped with SNB1-SNB4, and totally 4 Absorption Capacitances, Absorption Capacitance are connected in parallel on P, M, the end M, N2 respectively；Above-mentioned inversion electricity
The output end of road 4b is connected to leading-out terminal.The application of three-level inverter circuit 4b so that power cell structure is compacter, power
Unit is easily achieved.
Using three level H-bridge inverter circuit 4b of diode neutral point clamp, three level electricity can also be solved by unit cascaded
The not high problem of potential source type frequency converter output voltage.
The application of three level H-bridge inverter circuit 4b 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, thus to more friendly, the application of the application of motor insulation,
So that the unit number of high-voltage frequency conversion and speed-adjusting device is greatly decreased, volume reduction, the reliability of system can be greatly enhanced.
In preferred embodiment, there are two filter capacitor, above-mentioned twos for the direct current input side also parallel connection of above-mentioned first bridge arm
Filter capacitor is connected, and the anode of above-mentioned two filter capacitor connects the common-anode of above-mentioned common-anode uncontrollable rectifier circuit 2b, on
The cathode for stating two filter capacitors connects the common cathode of above-mentioned common cathode uncontrollable rectifier circuit 2b
In the present embodiment, the input terminal of above-mentioned inverter circuit 4b is connected on filter capacitor, above-mentioned C1, C2 totally two
Group filter capacitor is connected in parallel on the output end of corresponding rectification circuit 2b respectively, and two groups of filter capacitors are connected in series with, when practical application, often
The corresponding above-mentioned filter capacitor of a rectification circuit 2b can be replaced by capacitor filter 3b, and capacitor filter 3b can be by several
Electrolytic capacitor connects to obtain by series and parallel, i.e. capacitor filter 3b may be used electrolytic capacitor can also use it is nonpolarity
Thin-film capacitor is combined into the capacitor group of needs by the series, parallel of capacitance according to actual needs.
Inverter circuit 4b is equipped with 4 Absorption Capacitances, and Absorption Capacitance is connected in parallel on P, M, the end M, N2 respectively, and absorbing circuit is mainly used
In the overvoltage for absorbing IGBT conducting moment generations, play a protective role to IGBT device.
The influence of fluctuations filter capacitor of three-level inverter circuit 4b mid-point voltages, the type selecting and service life of IGBT use
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 connecting terminal of X3, above-mentioned single-phase connecting terminal connect in above-mentioned first bridge arm and above-mentioned second bridge arm
Point.
A kind of cascade high voltage frequency converter, above-mentioned cascade high voltage frequency converter have three above-mentioned level powers
Unit main circuit.
By description and accompanying drawings, the exemplary embodiments of the specific structure of specific implementation mode are given, it is new based on this practicality
Type spirit, can also make other conversions.Although above-mentioned utility model proposes existing preferred embodiment, however, these contents
It is not intended as limiting to.
For a person skilled in the art, after reading above description, various changes and modifications undoubtedly will be evident.
Therefore, appended claims should regard whole variations and modifications of the true intention and range that cover the utility model as.
The range and content of any and all equivalences in Claims scope are all considered as still belonging to the intention and model of the utility model
In enclosing.
Claims (8)
1. a kind of three level power unit main circuits, which is characterized in that including：
Two inlet wire terminal circuits, each inlet wire terminal circuit are respectively used to output three-phase current；
Two rectification circuits, each rectification circuit are coupled with the three-phase output end of an inlet wire terminal circuit respectively；
One inverter circuit, the inverter circuit are 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, which is characterized in that the inlet wire terminal circuit includes：
The three-phase output end of one three-phase terminal, 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 equipped with the first fuse between the A phase output terminals and the rectification circuit；
Second fuse is equipped 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, which is characterized in that the rectification circuit is by six
The three-phase bridge rectifier circuit that diode is constituted, the three-phase bridge rectifier circuit includes being total to by what three diodes were constituted
Anode uncontrollable rectifier circuit and the common cathode uncontrollable rectifier circuit being made of three diodes.
4. three level powers unit main circuit according to claim 3, which is characterized 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 4, which is characterized in that three level H-bridge includes：
Three level bridge arms of two diode clamps, the three level bridge arm are respectively the first bridge arm and the second bridge arm：
First capacitor group, the first capacitor group are made of two DC side energy-storage capacitors, the first capacitor group,
The first capacitor group is parallel to first bridge arm, the anode of the anode and first bridge arm of the first capacitor group
It is connected；
Second capacitor group, the second capacitor group are made of two DC side energy-storage capacitors, second capacitance
Device group is parallel to second bridge arm, and the anode of the second capacitor group is connected with the anode of second bridge arm；
The first capacitor group is connected with the neutral point of the second capacitor group；
The midpoint of first bridge arm is connected with the neutral point of the first capacitor group；
The midpoint of second bridge arm is connected with the neutral point of the second capacitor group；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, which is characterized in that the direct current of first bridge arm is defeated
It is also in parallel there are two filter capacitor to enter side, described two filter capacitors are connected, and the anode connection institute of described two filter capacitors
The anode of each diode in common-anode uncontrollable rectifier circuit is stated, the cathode of described two filter capacitors connects the common cathode
The cathode of each diode in the uncontrollable rectifier circuit of pole.
7. three level powers unit main circuit according to claim 5, which is characterized in that the outlet terminal circuit includes：
One single-phase connecting terminal, the single-phase connecting terminal connect the midpoint of first bridge arm and second bridge arm.
8. a kind of cascade high voltage frequency converter, the cascade high voltage frequency converter has as appointed in claim 1-7
Three level power unit main circuits described in meaning one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720712939.XU CN208028779U (en) | 2017-06-19 | 2017-06-19 | Three level power unit main circuits of one kind and cascade high voltage frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720712939.XU CN208028779U (en) | 2017-06-19 | 2017-06-19 | Three level power unit main circuits of one kind and cascade high voltage frequency converter |
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| CN208028779U true CN208028779U (en) | 2018-10-30 |
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ID=63896853
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171568A (en) * | 2017-06-19 | 2017-09-15 | 上海电气富士电机电气技术有限公司 | A kind of three level power unit main circuits and cascade high voltage RHVC |
-
2017
- 2017-06-19 CN CN201720712939.XU patent/CN208028779U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171568A (en) * | 2017-06-19 | 2017-09-15 | 上海电气富士电机电气技术有限公司 | A kind of three level power unit main circuits and cascade high voltage RHVC |
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