CN109462340A - Converter plant and its voltage-transforming method - Google Patents
Converter plant and its voltage-transforming method Download PDFInfo
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- CN109462340A CN109462340A CN201811553955.4A CN201811553955A CN109462340A CN 109462340 A CN109462340 A CN 109462340A CN 201811553955 A CN201811553955 A CN 201811553955A CN 109462340 A CN109462340 A CN 109462340A
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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
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Abstract
The present embodiments relate to frequency converter, a kind of converter plant and its voltage-transforming method are disclosed.In the present invention, converter plant includes several frequency converters；Main control module is electrically connected with each frequency converter, for each frequency converter it is electric when required 1/N switch periods of phase-shifting carrier wave, mutually stagger each frequency converter required each pwm pulse when must be electric；First voltage changing module is electrically connected with each frequency converter, and two output line voltages and remaining frequency converter for any two frequency converter to be on identical vector sideline carry out coupling superposition with the identical output line voltage in vector sideline direction.Compared with prior art, medium voltage frequency converter can be formed by general low voltage frequency converter, the available sufficient multiplexing of general low voltage frequency converter, and realize and allow converter plant to generate the stable voltage rating needed by low technical difficulty and simple control, also reduce development cost and handling of goods and materials cost.
Description
Technical field
The present embodiments relate to frequency converters, in particular to converter plant and its voltage-transforming method.
Background technique
Medium voltage frequency converter is widely used in large-scale Mining Market, petrochemical industry, municipal water supply, iron and steel metallurgy, electric power
The various blowers of the industries such as the energy, water pump, compressor, rolling mill etc..
Medium voltage frequency converter mostly uses the IGBT device of 3300V to form two level topologys defeated come the frequency conversion for realizing 1140V at present
Out, or using the IGBT device composition three-level topology of 1700V realize that the frequency conversion of 1140V exports.Or it needs to realize more
When such as 2300V grades of frequency converter of the frequency converter product of voltage levels, need using more 3300V IGBT device or
The IGBT device of 1700V.But inventors have found that the IGBT device of 3300V is not industry working standard device in existing market,
Device cost is high and delivery date is unstable.The frequency converter output voltage characteristic developed using 3300V grades of IGBT devices is bad, and voltage is abnormal
Variation is high, and dudt value is larger.More level exploitations are carried out using 1700V grades of IGBT, control is complicated, and technical difficulty is big, researches and develops cost
It is high.And the new importing of device and the exploitation of completely new product, material reusability is poor, and low voltage product mature technology originally is also difficult multiple
With increasing material operation cost and product operation cost.
Summary of the invention
Embodiment of the present invention is designed to provide a kind of converter plant and its voltage-transforming method.So that by general low
Voltage frequency changer can form medium voltage frequency converter, and reducing technical difficulty and research and development cost, general low voltage frequency converter can also obtain
Adequately multiplexing does not have to additional exploitation device, reduces material operation cost and product operation cost.
In order to solve the above technical problems, embodiments of the present invention provide a kind of converter plant, comprising:
At least N number of frequency converter, the N are the natural number greater than 2；
Main control module is electrically connected with each frequency converter, for each frequency converter it is electric when required load
1/N switch periods of wave phase shift mutually stagger each frequency converter required each pwm pulse when obtaining electric；
First voltage changing module is electrically connected with each frequency converter, for frequency converter described in any two to be in identical
Two output line voltages and remaining frequency converter output line voltage identical with the vector sideline direction on vector sideline carries out coupling
Close superposition.
Embodiments of the present invention additionally provide a kind of voltage-transforming method of converter plant, comprising: following steps:
To each frequency converter it is electric when required 1/N switch periods of phase-shifting carrier wave, so that each frequency converter is existed
Required each pwm pulse mutually staggers when obtaining electric；
By frequency converter described in any two be in two output line voltages on identical vector sideline and remaining frequency converter with
The identical output line voltage in vector sideline direction carries out coupling superposition；
Superimposed line voltage is exported.
In terms of existing technologies, due to being equipped with multiple frequency converters, main control module and first becomes embodiment of the present invention
Die block, frequency converter are Standard Inverter, can be used without developing and using again, and in existing multi-product, material multiplexing
Property it is high, main control module and each frequency converter are electrically connected, and main control module to each frequency converter it is electric when required phase-shifting carrier wave
1/N switch periods so that each frequency converter it is electric when required each pwm pulse mutually stagger, and the first voltage changing module with
Each frequency converter is electrically connected, two output line voltages and remaining frequency conversion being on identical vector sideline with any two frequency converter
Device carries out coupling superposition with the identical output line voltage in vector sideline direction, so that realization is by low technical difficulty and simply
Control allows converter plant to generate the stable voltage rating needed, and then also reduces research and development cost.And generating voltage rating
While, reduce material operation cost and product operation cost.
In addition, the N is 3, first voltage changing module includes: the transformer equal with the frequency converter quantity, and each
The transformer and each frequency converter correspond；
Any two-phase of any one of frequency converter is electric with the primary side winding of the respective corresponding transformer respectively
Property connection, and any one phase in the two-phase is also electrical with the vice-side winding of one of transformer in remaining two transformers
Connection, and the vice-side winding of any one of transformer is only electrically connected with a frequency converter.
In addition, the N is 4, first voltage changing module includes: and wherein one-to-one three first of three frequency converters
Transformer, three the second transformers corresponding with another frequency converter；
Any two-phase of the frequency converter of corresponding any one of first transformer primary side with first transformer respectively
Winding is electrically connected, and the one of them in the two-phase also become with one described first in the first transformer described in other two
The vice-side winding of depressor is electrically connected, another is also electrically connected with the vice-side winding of any one of second transformer；
Wherein, the vice-side winding of first transformer respectively only the frequency converter of the first transformer corresponding with one and
The vice-side winding of one the second transformer is electrically connected, and the vice-side winding of second transformer only corresponding with one
Anticipate first transformer frequency converter be electrically connected.
In addition, the converter plant further include: the second voltage changing module electrically connects with power grid and each frequency converter respectively
It connects.
In addition, second voltage changing module includes: to couple with the primary side winding of power grid electric connection, with primary side winding
Several vice-side windings, and the quantity of vice-side winding is identical as the quantity of the frequency converter, and corresponds electric connection.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the block diagram of converter plant in first embodiment of the invention；
Fig. 2 is converter plant output voltage vector figure in first embodiment of the invention；
Fig. 3 is converter plant phase-shifting carrier wave control block diagram in first embodiment of the invention；
Fig. 4 is the block diagram of converter plant in second embodiment of the invention；
Fig. 5 is converter plant output voltage vector figure in second embodiment of the invention；
Fig. 6 is converter plant phase-shifting carrier wave control block diagram in second embodiment of the invention；
Fig. 7 is the voltage-transforming method flow chart of converter plant in third embodiment of the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Each embodiment be explained in detail.However, it will be understood by those skilled in the art that in each embodiment party of the present invention
In formula, in order to make the reader understand this application better, many technical details are proposed.But even if without these technical details
And various changes and modifications based on the following respective embodiments, the application technical solution claimed also may be implemented.
The first embodiment of the present invention is related to a kind of converter plants, as shown in Figure 1, including at least two frequency converters, master
Control module, the first voltage changing module, main control module and each frequency converter are electrically connected, to each frequency converter it is electric when required carrier wave
1/N switch periods of phase shift mutually stagger each frequency converter required each pwm pulse when obtaining electric.First voltage changing module with
Each frequency converter is electrically connected, two output line voltages for being in any two frequency converter on identical vector sideline and remaining
Frequency converter carries out coupling superposition with the identical output line voltage in vector sideline direction.
Through the above it is not difficult to find that due to being equipped with multiple frequency converters, main control module and the first voltage changing module, frequency converter
For Standard Inverter, available without developing and using again, and in existing multi-product, material reusability is high, main control module with
Each frequency converter is electrically connected, and main control module to each frequency converter it is electric when required 1/N switch periods of phase-shifting carrier wave, make
Each frequency converter required each pwm pulse when obtaining electric is obtained to mutually stagger, and the first voltage changing module and each frequency converter are electrically connected,
Two output line voltages on identical vector sideline and remaining frequency converter and the vector sideline side are in any two frequency converter
Coupling superposition is carried out to identical output line voltage, allows converter plant to produce by low technical difficulty and simple control to realize
The voltage rating of the raw Wen Ding needed, and then also reduce research and development cost.And while generating voltage rating, material is reduced
Operation cost and product operation cost.
In addition, in the present embodiment, as shown in Figure 1, frequency converter is three, respectively frequency converter CON1, frequency converter
CON2 and frequency converter CON3, each frequency converter are 400V grades of three phase converters.First voltage changing module includes and frequency converter quantity phase
Deng transformer, and each transformer and each frequency converter correspond, and transformer is three, respectively transformer TR1, transformer
TR2 and transformer TR3, each transformer are single-phase transformer.The primary side winding TR1-1 of transformer TR1, the pair of transformer TR1
The turn ratio of side winding TR1-2, primary side winding TR1-1 and vice-side winding TR1-2 be 1:1, the primary side winding TR2-1 of transformer TR2,
The turn ratio of the vice-side winding TR2-2 of transformer TR2, primary side winding TR2-1 and vice-side winding TR2-2 are 1:1, transformer TR3's
The turn ratio of the vice-side winding TR3-2 of primary side winding TR3-1, transformer TR3, primary side winding TR3-1 and vice-side winding TR3-2 are 1:
1。
Specifically, as shown in Figure 1, the output end of frequency converter CON1 is respectively output end a1, output end b1, output end
C1, the output end of frequency converter CON2 are respectively output end a2, output end b2, output end c2, the output end difference of frequency converter CON3
Primary side winding TR1-1 for output end a3, output end b3, output end c3, transformer TR1 connects in the two-phase of frequency converter CON1,
It is connect on output end c1 and output end b1 respectively, the vice-side winding TR1-2 of transformer TR1 is respectively connected to a phase of frequency converter CON2
With a phase of frequency converter CON3, connect in output end c2 and output end b3.The primary side winding TR2-1 of transformer TR2 connects in frequency converter
It in the two-phase of CON2, is connect on output end a2 and output end c2 respectively, the vice-side winding TR2-2 of transformer TR2 is respectively connected to become
A phase of frequency device CON1 and a phase of frequency converter CON3, connect in output end c1 and output end a3.The primary side winding of transformer TR3
TR3-1 connects in the two-phase of frequency converter CON3, is connect on output end a3 and output end b3 respectively, the vice-side winding of transformer TR3
TR3-2 is respectively connected to a phase of frequency converter CON1 and a phase of frequency converter CON2, is connect on output end b1 and output end a2 respectively.
The output end c3 access motor device of the output end a1 of frequency converter CON1, the output end b2 of frequency converter CON2, frequency converter CON3.Such as
Shown in Fig. 3, main control module inputs modulating wave in the same direction to frequency converter CON1, frequency converter CON2 and frequency converter CON3, by frequency converter
CON1, frequency converter CON2, frequency converter CON3 carrier wave successively the phase switcher period 1/3, by the carrier wave of frequency converter CON1 be 0 week
Phase, frequency converter CON2 carrier wave be 1/3 period, frequency converter CON3 carrier wave be 2/3 period, form the pwm pulse of needs.To
Voltage vector-diagram as shown in Figure 2 is formed, it is as follows to carry out voltage vector superposition for Fig. 2:
Ua1b2=Ua1b1+Ub1a2+Ua2b2；
Ub2c3=Ub2c2+Uc2b3+Ub3c3；
Uc3a1=Uc3a3+Ua3c1+Uc1a1；
Since transformer TR1-1/TR1-2 is the former vice-side winding of TR1, and the turn ratio is 1:1, therefore has Ub1c1=
Uc2b3；
Since transformer TR2-1/TR2-2 is the former vice-side winding of TR2, and the turn ratio is 1:1, therefore has Ua2c2=
Uc1a3；
Since transformer TR3-1/TR3-2 is the former vice-side winding of TR3, and the turn ratio is 1:1, therefore has Ub1a2=
Ua3b3；
So that
Ua1b2=Ua1b1+Ua3b3+Ua2b2；
Ub2c3=Ub2c2+Ub1c1+Ub3c3；
Uc3a1=Uc3a3+Uc2a2+Uc1a1.
It can be seen from the above content that transformer TR1~transformer TR3 is coupled by respective former secondary side, by original edge voltage
It is coupled to secondary side, and is overlapped with the voltage of the 400V of three standards grade frequency converter output, realizes that the medium voltage converter of 1140V is defeated
Out.
It will be further appreciated that as shown in Figure 1, converter plant further includes the second voltage changing module TR0, respectively with power grid and respectively
Frequency converter is electrically connected.Second voltage changing module is input rectifying phase-shifting transformer, including the secondary sides of a primary side winding and three around
Group, three vice-side winding one-to-one correspondence are connected with the input terminal of frequency converter CON1, frequency converter CON2 and frequency converter CON3.To logical
It crosses the second voltage changing module TR0 and carries out electrical isolation, eliminate the extra load of power grid, prevent harmonic wave from influencing other sensitive equipments, and
Each frequency converter can be made mutually indepedent, realize voltage superposition series connection.Phase shift connection can effectively eliminate low-frequency harmonics, can be with
Eliminate 6n-1 harmonic wave below, n bit location series.In the present embodiment, 3 n, then can eliminate 17 times it is below humorous
Wave.
Second embodiment of the present invention is related to a kind of converter plant, uses the 400V grade of standard in the first embodiment
Three phase converter realizes the medium voltage converter output of 1140V by magnetic coupling scheme.And in this second embodiment, it is same to use
The 400V grade three phase converter of standard by magnetic coupling scheme, but is accomplished that 2300V grades of high-pressure frequency-conversion outputs.In this implementation
In mode, as shown in figure 4, frequency converter is four, respectively frequency converter CON1, frequency converter CON2, frequency converter CON3 and frequency converter
CON4, each frequency converter are 400V grades of three phase converters.First voltage changing module includes one-to-one with wherein three frequency converters
Three the first transformers, i.e., transformer TR1 corresponding with frequency converter CON1, transformer TR2 corresponding with frequency converter CON2, with change
The corresponding transformer TR3 of frequency device CON3, three the second transformers corresponding with frequency converter CON4, respectively transformer TR4, transformation
Device TR5, transformer TR6, each transformer is single-phase transformer.The primary side winding TR1-1 of transformer TR1, the pair of transformer TR1
The turn ratio of side winding TR1-2, primary side winding TR1-1 and vice-side winding TR1-2 be 1:1, the primary side winding TR2-1 of transformer TR2,
The turn ratio of the vice-side winding TR2-2 of transformer TR2, primary side winding TR2-1 and vice-side winding TR2-2 are 1:1, transformer TR3's
The turn ratio of the vice-side winding TR3-2 of primary side winding TR3-1, transformer TR3, primary side winding TR3-1 and vice-side winding TR3-2 are 1:
1.The vice-side winding TR4-2 of the primary side winding TR4-1 of transformer TR4, transformer TR4, primary side winding TR4-1 and vice-side winding
The turn ratio of TR4-2 is 1:1, the vice-side winding TR5-2 of the primary side winding TR5-1 of transformer TR5, transformer TR5, primary side winding
The turn ratio of TR5-1 and vice-side winding TR5-2 are 1:1, the primary side winding TR6-1 of transformer TR6, the vice-side winding of transformer TR6
The turn ratio of TR6-2, primary side winding TR6-1 and vice-side winding TR6-2 are 1:1.
Specifically, as shown in figure 4, the output end of frequency converter CON1 is respectively output end a1, output end b1, output end
C1, the output end of frequency converter CON2 are respectively output end a2, output end b2, output end c2, the output end difference of frequency converter CON3
For output end a3, output end b3, output end c3, the output end of frequency converter CON4 is respectively output end a4, output end b4, output end
c4.The primary side winding TR1-1 of transformer TR1 connects in the two-phase of frequency converter CON1, is connect respectively in output end c1 and output end b1
On, a phase of the vice-side winding TR1-2 access transformer TR2 of transformer TR1 connects on output end c2, also connects in transformer TR4
Vice-side winding TR4-2 one end.The primary side winding TR2-1 of transformer TR2 connects in the two-phase of frequency converter CON2, connects respectively
On output end a2 and output end c2, the vice-side winding TR2-2 of transformer TR2 is respectively connected to a phase of frequency converter CON1, connects defeated
On outlet c1, also connect in one end of the vice-side winding TR6-2 of transformer TR6.The primary side winding TR3-1 of transformer TR3, which connects, to be become
It in the two-phase of frequency device CON3, is connect on output end a3 and output end b3 respectively, the vice-side winding TR3-2 of transformer TR3, which is accessed, to be become
The one of frequency device CON1 connects on output end b1, also connects in one end of the vice-side winding TR5-2 of transformer TR5.Frequency converter CON1
Output end a1, the output end b2 of frequency converter CON2, frequency converter CON3 output end c3 access motor device.It is main as shown in Figure 6
It controls module and inputs modulating wave in the same direction to frequency converter CON1, frequency converter CON2, frequency converter CON3 and frequency converter CON4, by frequency converter
CON1, frequency converter CON2, frequency converter CON3 and frequency converter CON4 carrier wave successively the phase switcher period 1/4, by frequency converter
The carrier wave of CON1 be 0 period, frequency converter CON2 carrier wave be 1/4 period, frequency converter CON3 carrier wave be 2/4 period, frequency converter
The carrier wave of CON2 was 3/4 period, formed the pwm pulse of needs.To forming voltage vector-diagram as shown in Figure 5, for Fig. 5 into
The superposition of row voltage vector is as follows:
Ua1b2=Ua1b1+UTR3-2+UTR5-2+Ua2b2；
Ub2c3=Ub2c2+UTR1-2+UTR4-2+Ub3c3；
Uc3a1=Uc3a3+UTR2-2+UTR6-2+Uc1a1；
Since transformer TR1-1/TR1-2 is the former vice-side winding of TR1, and the turn ratio is 1:1, therefore has Ub1c1=UTR1-
2；
Since transformer TR2-1/TR2-2 is the former vice-side winding of TR2, and the turn ratio is 1:1, therefore has Ua2c2=UTR2-
2；
Since transformer TR3-1/TR3-2 is the former vice-side winding of TR3, and the turn ratio is 1:1, therefore has Ua3b3=UTR3-
2；
Since transformer TR4-1/TR4-2 is the former vice-side winding of TR4, and the turn ratio is 1:1, therefore has Ub4c4=UTR4-
2；
Since transformer TR5-1/TR5-2 is the former vice-side winding of TR5, and the turn ratio is 1:1, therefore has Ua4b4=UTR5-
2；
Since transformer TR6-1/TR6-2 is the former vice-side winding of TR6, and the turn ratio is 1:1, therefore has Ua4c4=UTR6-
2；
So that
Ua1b2=Ua1b1+Ua2b2+Ua3b3+Ua4b4；
Ub2c3=Ub2c2+Ub1c1+Ub3c3+Ub4c4；
Uc3a1=Uc3a3+Uc2a2+Uc1a1+Uc4a4；
It can be seen from the above content that transformer TR1~transformer TR4 is coupled by respective former secondary side, by original edge voltage
It is coupled to secondary side, and is overlapped with the voltage of the 400V of three standards grade frequency converter output, realizes that the high-pressure frequency-conversion of 2300V is defeated
Out.
Third embodiment of the present invention is related to a kind of voltage-transforming method of converter plant, as shown in fig. 7, implementing using first
Converter plant in mode or second embodiment, includes the following steps:
Step 710, to each frequency converter it is electric when required 1/N switch periods of phase-shifting carrier wave, so that each frequency converter is existed
Required each pwm pulse mutually staggers when obtaining electric；
Step 720, frequency converter described in any two is in two output line voltages on identical vector sideline and remaining
Frequency converter carries out coupling superposition with the identical output line voltage in vector sideline direction；
Step 730, superimposed line voltage is exported.
Specifically, the line voltage formed when the method in present embodiment is implemented in the first embodiment is real first
It applies mode to be illustrated, no longer be described in detail herein.Likewise, the method in present embodiment is implemented in second embodiment
The line voltage formed when middle has been illustrated in second embodiment, is no longer described in detail herein.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the present invention,
And in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (6)
1. a kind of converter plant, it is characterised in that: include:
At least N number of frequency converter, the N are the natural number greater than 2；
Main control module is electrically connected with each frequency converter, for each frequency converter, when obtaining electric, required carrier wave to be moved
1/N switch periods of phase mutually stagger each frequency converter required each pwm pulse when obtaining electric；
First voltage changing module is electrically connected, for frequency converter described in any two to be in identical vector with each frequency converter
Two output line voltages and remaining frequency converter on sideline couple with the identical output line voltage in vector sideline direction folded
Add.
2. converter plant according to claim 1, it is characterised in that: the N be 3, first voltage changing module include: with
The equal transformer of the frequency converter quantity, and each transformer and each frequency converter correspond；
Primary side winding of any two-phase of any one of frequency converter respectively with the respective corresponding transformer electrically connects
It connects, and vice-side winding of any one phase in the two-phase also with one of transformer in remaining two transformers electrically connects
It connects, and the vice-side winding of any one of transformer is only electrically connected with a frequency converter.
3. converter plant according to claim 1, it is characterised in that: the N be 4, first voltage changing module include: with
Wherein one-to-one three the first transformers of three frequency converters, three the second transformers corresponding with another frequency converter；
Any two-phase of the frequency converter of corresponding any one of first transformer primary side winding with first transformer respectively
Be electrically connected, and the one of them in the two-phase also with first transformer in the first transformer described in other two
Vice-side winding be electrically connected, another also with the vice-side winding of any one of second transformer be electrically connected；
Wherein, the vice-side winding of first transformer distinguishes the only frequency converter of the first transformer corresponding with one and one
The vice-side winding of second transformer is electrically connected, and the vice-side winding of second transformer only any institute corresponding with one
The frequency converter for stating the first transformer is electrically connected.
4. converter plant according to claim 1, it is characterised in that: the converter plant further include:
Second voltage changing module is electrically connected with power grid and each frequency converter respectively.
5. converter plant according to claim 4, it is characterised in that: second voltage changing module includes: and the power grid
The primary side winding of electric connection, several vice-side windings coupled with primary side winding, and the quantity of vice-side winding and the frequency conversion
The quantity of device is identical, and corresponds electric connection.
6. a kind of voltage-transforming method of the converter plant as described in any one of claim 1 to 5, it is characterised in that: including such as
Lower step:
To each frequency converter it is electric when required 1/N switch periods of phase-shifting carrier wave, make each frequency converter must be electric
When required each pwm pulse mutually stagger；
Frequency converter described in any two is in two output line voltages on identical vector sideline and remaining frequency converter and the arrow
The identical output line voltage in amount sideline direction carries out coupling superposition；
Superimposed line voltage is exported.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811553955.4A CN109462340A (en) | 2018-12-19 | 2018-12-19 | Converter plant and its voltage-transforming method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811553955.4A CN109462340A (en) | 2018-12-19 | 2018-12-19 | Converter plant and its voltage-transforming method |
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|---|---|
| CN109462340A true CN109462340A (en) | 2019-03-12 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739070A (en) * | 2011-04-07 | 2012-10-17 | 李永盼 | Energy feedback type three-phase high-voltage frequency converter |
| CN102739097A (en) * | 2011-04-07 | 2012-10-17 | 李永盼 | Method and circuit utilizing low-voltage inversion to realize high-voltage inversion, and high-voltage converter |
| CN107612341A (en) * | 2017-09-21 | 2018-01-19 | 武汉大学 | Multiport based on 3N+3 switch cascades can present type high tension transformer and control method |
-
2018
- 2018-12-19 CN CN201811553955.4A patent/CN109462340A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739070A (en) * | 2011-04-07 | 2012-10-17 | 李永盼 | Energy feedback type three-phase high-voltage frequency converter |
| CN102739097A (en) * | 2011-04-07 | 2012-10-17 | 李永盼 | Method and circuit utilizing low-voltage inversion to realize high-voltage inversion, and high-voltage converter |
| CN107612341A (en) * | 2017-09-21 | 2018-01-19 | 武汉大学 | Multiport based on 3N+3 switch cascades can present type high tension transformer and control method |
Non-Patent Citations (1)
| Title |
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| E. CENGELCI: "A New Medium Voltage PWM Inverter Topology for Adjustable Speed Drives", 《IEEE》 * |
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