CN202197222U - Voltage converter - Google Patents
Voltage converter Download PDFInfo
- Publication number
- CN202197222U CN202197222U CN201120268607XU CN201120268607U CN202197222U CN 202197222 U CN202197222 U CN 202197222U CN 201120268607X U CN201120268607X U CN 201120268607XU CN 201120268607 U CN201120268607 U CN 201120268607U CN 202197222 U CN202197222 U CN 202197222U
- Authority
- CN
- China
- Prior art keywords
- voltage
- voltage changer
- changer
- section
- transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Abstract
The utility model provides a voltage converter (100), which is used for converting first alternating current (AC) voltage (103) into second AC voltage and comprises three phase units (110) which can be a part of the voltage converter and an input transformer (120). The input transformer is suitable for enabling the first AC voltage to be converted into medium AC voltage to be supplied to a rectifier. Each phase unit comprises a rectifier section (130), a direct current (DC) periodic line section (140) and a converter section (150), a first three-level branch (151) of each converter section provides a phase (153) for the second AC voltage and is connected with a second three-level branch (152) of the converter section so as to enable a nine-level phase of the obtained phase (153) to output voltage to the phase, and the input transformer can perform phase shift to on the medium AC voltage relatively so as to achieve the minimum harmonic wave on the first AC voltage.
Description
Technical field
The utility model relates to the electric power electricity field.Specifically, the utility model relates to and is used for an AC voltage transformation is become the voltage changer (voltage inverter) of the 2nd AC voltage and has the rack unit of voltage changer.
Background technology
For example, voltage changer is used for industrial transmission configuration, comprises rectifier section, DC link section and transformer section, and being supplied with by principal voltage provides an AC voltage to it, and the 2nd AC voltage is offered load, for example motor.
Usually, because the simplification of its design, comprise that being suitable for generating 5 level is used for for example to motor AC being provided voltage to the transformer section of the three level branches (1eg) (or being three-level converter) of phase output voltage mutually.Yet this can cause the higher harmonics distortion of current of electric.
The utility model content
A purpose of the utility model provides a kind of being used for and becomes the 2nd AC voltage for example to be used to have the voltage changer of the industrial transmission configuration of low harmonics distortion the one AC voltage transformation.
This purpose of the utility model solves through the theme of independent claims, and wherein additional embodiments is combined in dependent claims and following the description.
The first aspect of the utility model relates to the voltage changer that is used for an AC voltage transformation is become the 2nd AC voltage.Each AC voltage can comprise more than a phase, for example three phases.
According to the embodiment of the utility model, voltage changer comprises three facies units.Input transformer (input transformer) can be voltage changer a part or externally.Each facies unit comprises rectifier section, DC link section and has the transformer section of two three level branches (being the H bridge).The branch of transformer section can be suitable for generating three different voltages with different, for example+DC, 0 and-DC, wherein DC is the voltage in the DC link.The H bridge can be suitable for generating 5 different branches to branch's voltage level.
Input transformer is suitable for an AC voltage transformation is become middle AC voltage, and said middle AC voltage is provided for rectifier.Rectifier is suitable for middle AC voltage commutation is become dc voltage, and said dc voltage is provided for the DC link.
Can carry out phase shift relative to each other to AC voltage in the middle of said by transformer, so that realize the minimum harmonic wave on the AC voltage.
First branch of transformer section provides the phase of the 2nd AC voltage, and the interconnection of second branch of transformer section, and feasible nine level that obtain the phase of the 2nd AC voltage arrive the phase output voltage mutually.
In this way, electric pressure converter is adapted to pass through and uses the converter with the output of three level that the 2nd level and smooth relatively AC voltage is provided.
Voltage changer possibly be used for the minimum engineering design of industrial transmission configuration.
Voltage changer can be operated by any output frequency, preferably between 0Hz and 75Hz.75Hz also is provided above output frequency, for example 100Hz or up to hundreds of Hz.
Voltage changer can provide any output voltage, and for example scope is from 6kV to 6.9kV.Also be provided at the output voltage between 1kV and tens kV.
Voltage changer can transmit the power output up to tens MVA.Can adjust cooling mechanism with respect to power output.Generally speaking, compare the air cooling voltage changer, the water cooling voltage changer possibly can transmit higher power output, for example is up to 7MVA with air cooling, and with water cooling more than 5MVA.
The facies unit of voltage changer is the same.
Voltage changer can provide 9 level to arrive the phase output voltage mutually.Therefore the semi-conductive serial or parallel connection of required power not.On the contrary, for example each transformer section branch (it can be the H bridge) is connected to public star point.This allows to switch relative to each other three-level converter, and obtains 9 level and arrive the phase output voltage mutually.
Comprise the output filter that is used to improve output voltage waveforms.
The rectifier of each facies unit can form 36 pulse rectifiers towards network, obtains because High Power Factor and the low network harmonic that the high impulse number causes.Power factor can be greater than 0.95.
Under the situation of mistake, fire prevention mechanism can connect all semiconductors through voltage changer.
Part capacitor can be coupled to the DC bus via series inductance, so that restriction is from first current peak of DC link. capacitor after starting fire prevention mechanism.
In case be short-circuited, non-ly fuse protectedly guarantee that the overload capacity through using them is distributed in the rudimental energy in the system on the healthy electric component.Can be from the input power of electrical consumer device (electric consumer) by the converter semiconductor in the input short circuit, and can not arrive other electric component and can not damage other electric component.
Voltage changer also can have the thyristor crowbar (thyristor crowbar) that is integrated in the rectifier module.The thyristor crowbar can activate and make the rectifier short circuit to prevent further to damage voltage changer simultaneously.Subsequently, but the network supply of off voltage converter.
Thus, fire prevention mechanism can at first respond when being short-circuited, and breaks off network supply subsequently.
In order to detect short circuit, passive plate can be installed in voltage changer.Under the situation of short circuit, passive plate is starting ignition immediately.
Can carry out the rectifier monitoring through the voltage of measuring between middle connection of rectifier and the DC link neutral point.Under the situation that rectifier diode has been broken, start tripping operation, make and will break off network supply.
Also can earth fault protection be provided through the voltage on the monitoring facies unit common point.If make a mistake, then voltage increases and starts tripping operation.
Protection relay can be used for monitoring transformer.Under the situation of fault, the phase current sum is not equal to 0, and protection relay breaks off the electric power supply.Protection relay can provide three types protection, and they are owing to the detection of excessive current of transshipping and fault causes, in response to short circuit current with in response to high short circuit current.
According to an embodiment of the utility model, input transformer comprises that the secondary winding of elementary winding and six insulation of one or more insulation is so that carry out phase shift with middle AC voltage.
But it is the input transformer dry type or oil-filled.Differing between per two adjacent secondary winding can be different or equal.For example, differing between two adjacent secondary winding can be 10 °.
Input transformer can be modular, can be coupled to facies unit.
An embodiment according to the utility model; Input transformer can comprise the elementary winding of two insulation and the secondary winding of two pairs of insulation; Every pair of secondary winding that comprises three insulation wherein, and wherein each elementary winding is assigned to the secondary winding of a pair of insulation.
According to another aspect of the utility model, voltage changer can comprise: main circuit breaker is suitable for voltage changer is connected to the network supply that an AC voltage is provided, and interrupts an AC voltage after the mistake in detecting voltage changer.
Main circuit breaker can react under failure condition, follows fire prevention mechanism, and can voltage changer and network supply be broken off.
According to an embodiment of the utility model, voltage changer comprises charging circuit, and this charging circuit is suitable for the capacitor charging to the DC link.
Can before closed main circuit breaker, give the capacitor charging of DC link so that keep low inrush current (inrush current).
Charging circuit can comprise the three-phase transformer that is connected to each phase neutral point and all three common-rail star point mutually.This can allow to use the converter diode to give the charging of DC link. capacitor as rectifier.
According to an embodiment of the utility model, the said facies unit of part or whole facies unit (for example transformer section, DC link section and/or rectifier section) can be designed to module at least.
For example after making a mistake, the facies unit module can be to recall (the retraced and replaced modular) of modular and replaceable modular.Therefore, voltage changer can comprise slide rail so that extract phase unit module easily.
According to an embodiment of the utility model, each facies unit of voltage changer comprises two converters, and they are connected to the DC link concurrently.
Power output according to facies unit can be used second converter.Two converters all can be parallel to the DC link and firmly in the bifurcation interconnection or be connected to for example motor phase again.Second converter can be expanded the power output of facies unit.
According to an embodiment of the utility model, voltage changer is air cooled.
According to an embodiment of the utility model, voltage changer is water-cooled.
Air cooled voltage changer and water-cooled voltage changer can comprise also that all heat exchanger is to send near the warm air voltage changer.
Above the relating on the other hand of the utility model, comprise with below the rack unit (cabinet unit) of described voltage changer.
Transformer can be the part of voltage changer, and can be arranged to transducer rack (converter cabinet) in delegation.Transformer also can be provided with separately, perhaps can be provided by the external supplier.
According to an embodiment of the utility model, the rack unit comprises at least one door, and this at least one door is equipped with solenoid interlock, makes as long as said at least one door of voltage changer energising just can not be opened.
Voltage changer also can comprise shell, for example be used to provide the control system of motor torque and speed ability, for example be used for the excitation unit of brushless excitation and by-pass unit synchronously under brush excitation and the situation that exchanges being used under the direct current situation of excitation (excitation) circuit of synchronous machine to have at the field circuit of synchronous machine, said synchronous by-pass unit is used for asynchronous machine is artificial or be automatically brought to the fixed frequency line and turn back to pressure converter and have only the very short power breakdown of motor or even do not have a power breakdown.
Voltage changer can comprise that also the output decoupler is to break off electrical consumer device (for example motor) from voltage changer under the not normal situation of running.For example can pass through crank (crank) manual operation decoupler.
And voltage changer can be adapted to pass through diagnostic software (for example DriveWindow and DriveMonitorTM) and obtain this locality and/or remote maintenance and/or monitoring.
Description of drawings
The example embodiment of the utility model will be described with reference to the drawings hereinafter.
Fig. 1 illustration have the industrial transmission configuration of main circuit breaker, input transformer, load and voltage changer according to the example embodiment of the utility model.
Fig. 2 illustration according to the DC link and the transformer section with two three level branches of the facies unit of the example embodiment voltage changer of the utility model.
Fig. 3 illustration according to the example of the filter of the voltage changer of the utility model example embodiment.
Fig. 4 illustration according to the charhing unit of the DC link of the voltage changer of the utility model example embodiment.
Fig. 5 illustration according to the hard parallel connection of two converters of the utility model example embodiment.
Fig. 6 illustration be used for the sketch map of air stream of the voltage changer of cooling air cooling according to the utility model example embodiment.
Fig. 7 illustration according to the input transformer of the voltage changer of the utility model example embodiment.
Fig. 8 illustration according to the input transformer of the voltage changer of the utility model example embodiment.
Fig. 9 illustration according to the stereogram of the inside of the air cooled voltage changer (not having input transformer) of the utility model example embodiment.
Figure 10 illustration according to the stereogram of the inside of the water-cooled voltage changer (not having input transformer) of the utility model example embodiment.
Embodiment
Fig. 1 has described the voltage changer 100 according to the utility model example embodiment, comprises three facies units 110 and input transformer 120 that are connected to this voltage changer.Each facies unit 110 comprises rectifier section 130, DC link section 140 and has the transformer section 150 of filter 170.
Fig. 1 has described to be suitable for providing to input transformer 120 main circuit breaker 180 of an AC voltage 103, and AC voltage 105 was to offer rectifier 130 in the middle of input transformer 120 became an AC voltage transformation.
Fig. 2 illustration DC link 140 and converter 150 (being the H bridge).The one or three level branch 151 is connected to load 190.The two or three level branch 152 is connected to public star point 158 with second branch 152 of other facies unit.The neutral point 154 of three level branches is connected to the neutral point 144 of DC link.
The three level branches of thus, switching the transformer section of facies unit relative to each other allow to obtain 5 level and are branched off into branch's output voltage.On the other hand, 5 level facies units of switched voltage converter allow to obtain 9 level and arrive the phase output voltage mutually relative to each other.
Fig. 3 illustration filter 170, each all is connected to first branch 151 of converter 150, and be connected to jointly ground 310.
Fig. 4 illustration be used for charging circuit 400 to the charging of the capacitor of DC link.Charging circuit comprises the three-phase transformer 410 that is connected to each phase neutral point 144 and common-rail star point 158.
Fig. 5 illustration be parallel to DC link 140 and be connected two converters 150 of phase of the electrical consumer device 190 that can be motor again.
Fig. 6 illustration hold above (house) with below air stream 610 in the rack unit 600 of described voltage changer 100.Voltage changer is arranged in the shell 602, and shell 602 comprises and is equipped with air filtration pad 620 so that prevent dust and particle gets into the air inlet 605 of rack unit.
Warning can appear: if air filtration pad 620 is contaminated, and if the air filtration pad that pollutes be not cleaned or replace then voltage changer shut-down operation.
Air flows through at first that responsive to temperature has been installed on it is semi-conductive heat sink 630, for example rectifier section 130 and/or transformer section 150.
At the back, via the passive component 640 of the cooling element that is installed in top cover in addition 650 cooling voltage changers, cooling element 650 can be cooling fan or heat exchanger to the part air before leaving shell 602.Cooling element 650 can comprise that noise reduces outlet.According to the power output of voltage changer, a plurality of cooling elements or redundant cooling element can be installed on the shell, and when the shut-down operation of one of other cooling element, redundant cooling element starts.
Voltage changer also can be through the water cooling circuit cools.Additionally, the cooling element as heat exchanger or fan can be installed, be used for shell 602 inner or on air circulation and/or heat dissipation.
Above with the cooling mechanism that describes below can be thermostatically controlled.
Fig. 7 illustration be connected to network supply 103 and be connected to the input transformer 120 of rectifier 130 and DC link 140 through its six secondary winding 122 through its elementary winding 121.
Elementary winding 121 is assigned to six secondary winding 122 that relative to each other carry out phase shift.
Fig. 8 illustration have the alternative input transformer 120 of two elementary windings 121 and two pairs 125 secondary winding, every pair 125 comprises three secondary winding 122, wherein each elementary winding 121 is assigned to a pair of 125 secondary winding.
What Fig. 9 showed the air cooled voltage changer that is assembled with three facies units 110 possibly come into line (line-up).One of facies unit comes into line on another, and is connected to control and terminal rack with mechanical system.Facies unit comprises rectifier section 130, transformer section 150 and DC link section 140.The part of voltage changer, for example DC link section can be installed more than once to improve power output.End section (terminal section) is connected to voltage changer.Control section is held the equipment that is used for the control transformation device.In end section, input transformer cable and loaded cable are connected to voltage changer.Cable inlet can get into end section from the top or from the bottom.On top cover, three standard fan 901 and a redundant fan are connected to the voltage changer rack via redundant capping (flaps).Air flow is interrupted in redundant capping when fan does not move.
Figure 10 shows possibly coming into line of water-cooled voltage changer.In end section 1004, input transformer cable and loaded cable can be connected to voltage changer.For each facies unit 110, rectifier section 130, DC link section 140 and transformer section 150 levels come into line.The part of these facies units, for example transformer section and rectifier section can be designed to module.Additionally, part can be installed more than once to improve power output.Control rack 1001 holds and is used for the control transformation device, for example switches the equipment of IGCT in power converter cells.Water cooling unit cabinet 1002 is held two pumps that are used for redundancy purpose.On top cover, heat exchanger 1003 can be installed to send near the warm air voltage changer.
In claims, word " comprises " does not get rid of other element or step, and indefinite article " " is not got rid of a plurality of.The pure fact of some tolerance of in different each other dependent claims, setting forth is not indicated the combination that can not advantageously use these tolerance.
Claims (11)
1. voltage changer (100) that is used for an AC voltage (103) is transformed into the 2nd AC voltage (107) comprising:
Three facies units (110);
Input transformer (120);
Wherein each facies unit (110) comprises rectifier section (130), DC link section (140) and transformer section (150);
Wherein said input transformer (120) is suitable for becoming middle AC voltage (105) to offer said rectifier (130) a said AC voltage transformation;
Wherein said rectifier (130) is suitable for becoming dc voltage to offer said DC link AC voltage commutation in the middle of said;
The one or three level branch (151) of wherein said transformer section (150) provides the phase (153) of said the 2nd AC voltage; And the interconnection of the two or three level branch (152) of said transformer section (150) makes nine level that obtain said phase (153) arrive the phase output voltage mutually;
Wherein by said input transformer with AC voltage phase shift relative to each other in the middle of said, so that realize the minimum harmonic wave on the said AC voltage.
2. voltage changer as claimed in claim 1 (100),
Wherein said input transformer (120) comprises the elementary winding (121) of an insulation and the secondary winding (122) of six insulation.
3. voltage changer as claimed in claim 1 (100),
Wherein said input transformer (120) comprises the elementary winding (121) and two secondary winding (122) to (125) insulation of two insulation;
Wherein every pair (125) comprise the secondary winding (122) of three insulation;
Wherein each elementary winding (121) is distributed to the secondary winding of a pair of (125) insulation.
4. voltage changer as claimed in claim 1 (100) also comprises: main circuit breaker (180), said main circuit breaker (180) are suitable in detecting said voltage changer, interrupting after the mistake a said AC voltage.
5. voltage changer as claimed in claim 1 (100) also comprises charging circuit (400),
Wherein said charging circuit is suitable for the capacitor charging to said DC link.
6. voltage changer as claimed in claim 1 (100),
Wherein said facies unit (110) is designed to module.
7. voltage changer as claimed in claim 1 (100),
Wherein each facies unit (110) comprises the transformer section with two three level branches (150);
Wherein said transformer section is parallel to said DC link (140).
8. voltage changer as claimed in claim 1 (100),
Wherein said voltage changer is air cooled.
9. voltage changer as claimed in claim 1 (100),
Wherein said voltage changer is water-cooled.
10. a rack unit (600) comprises voltage changer as claimed in claim 1 (100).
11. rack as claimed in claim 10 unit (600) also comprises at least one door;
Wherein said door is equipped with solenoid interlock, makes as long as said at least one door of said voltage changer energising just can not be opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120268607XU CN202197222U (en) | 2011-07-13 | 2011-07-13 | Voltage converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120268607XU CN202197222U (en) | 2011-07-13 | 2011-07-13 | Voltage converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202197222U true CN202197222U (en) | 2012-04-18 |
Family
ID=45952121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120268607XU Expired - Lifetime CN202197222U (en) | 2011-07-13 | 2011-07-13 | Voltage converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202197222U (en) |
-
2011
- 2011-07-13 CN CN201120268607XU patent/CN202197222U/en not_active Expired - Lifetime
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Castellan et al. | A review of power electronics equipment for all-electric ship MVDC power systems | |
| US8830658B2 (en) | Switchgear cabinet arrangement of a device for producing electric energy | |
| WO2010116806A1 (en) | Power conversion device | |
| US8711530B2 (en) | Pluggable power cell for an inverter | |
| JP5268744B2 (en) | Power converter | |
| Liang et al. | Current source modular multilevel converter for HVDC and FACTS | |
| US20200266629A1 (en) | Group of electrical ac generators with rectifiers connected in series | |
| JP6404768B2 (en) | Power converter | |
| WO2011008514A2 (en) | Pluggable power cell for an inverter and providing modular power conversion | |
| EP3063850A1 (en) | Breaker circuit | |
| CA2881664C (en) | Dc power transmission systems and method of assembling the same | |
| Heidary et al. | Series transformer based diode-bridge-type solid state fault current limiter | |
| US20200287378A1 (en) | Array of electrical generator units | |
| RU2577031C1 (en) | Direct current power source for power unit | |
| US8654494B2 (en) | Systems and methods for limiting voltage on an auxiliary bus | |
| CN110710078A (en) | Power supply system and method | |
| Kandula et al. | Design considerations and experimental results for a 12.47-kV 3-phase 1 MVA power router | |
| CN103595025A (en) | Alternating current side wiring structure of direct current transmission system of power supply converter and control method thereof | |
| CN202197222U (en) | Voltage converter | |
| Carreno et al. | Configurations, Power Topologies and Applications of Hybrid Distribution Transformers. Energies 2021, 14, 1215 | |
| US20210359617A1 (en) | Electrical assembly | |
| Sau-Bassols et al. | Technical feasibility of Power Flow Controllers for HVDC grids | |
| Giannakis et al. | Design considerations of power semiconductor devices employed in vscs under short-circuit fault conditions in mvdc distribution grids | |
| JP5719827B2 (en) | Power converter | |
| Kandula et al. | Experimental evaluation of power router based on a fractionally-rated back-to-back converter at 13 kV 1MVA |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180614 Address after: Baden, Switzerland Patentee after: ABB TECHNOLOGY LTD. Address before: Zurich Patentee before: ABB T & D Technology Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120418 |