CN106998145A - Reversely DC converting unit is cascaded with circulation from the symmetric double of the ability of elimination - Google Patents
Reversely DC converting unit is cascaded with circulation from the symmetric double of the ability of elimination Download PDFInfo
- Publication number
- CN106998145A CN106998145A CN201710231229.XA CN201710231229A CN106998145A CN 106998145 A CN106998145 A CN 106998145A CN 201710231229 A CN201710231229 A CN 201710231229A CN 106998145 A CN106998145 A CN 106998145A
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- China
- Prior art keywords
- converting unit
- cascade
- circulation
- reversely
- elimination
- 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.)
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Classifications
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
Abstract
DC converting unit is cascaded the invention discloses a kind of symmetric double with circulation reversely from elimination ability, it is adaptable to which DC voltage is interconnected between different voltage class in the case of high-power.The DC converting unit includes the cascade module that two inputs and output end are connected, and each cascade module is made up of two modular multi-level converter (MMC) structures and an intermediate-frequency transformer.DC converting unit progress connection in series-parallel modular combination be can obtain into high-power DC converter, the purpose of DC voltage conversion is finally reached.The present invention transmits power dissipation, it is to avoid the single intermediate-frequency transformer of system application bottleneck may be turned into high-voltage large-capacity occasion by using, therefore compares the advantage that traditional MMC type DC converter has intermediate-frequency transformer to be more easy to coiling；The present invention uses symmetric double cascade structure, and the circulation in each cascade module produced by two MMC can be made by control reversely from elimination；The structure being combined again using MMC with connection in series-parallel modular combination, can be achieved the DC converting of wider no-load voltage ratio.
Description
Technical field
There is ring the present invention relates to modular multi-level converter technology and DC converting technical field, more particularly to one kind
Stream is reversely from the symmetric double cascade DC converting unit of the ability of elimination.
Background technology
Worsening shortages and the aggravation of environmental pollution with traditional fossil energy, are supplied clean electric power energy source and the energy
The requirement of the new technologies such as wide area balance is needed to engender and improve that this brings significant challenge to traditional power network correlation technique.For
The further stability and reliability for improving power network, improves the power network quality of power supply, improves power supply capacity, isolated fault region,
Facilitate the flexible access of regenerative resource and energy storage device simultaneously, domestic and foreign scholars are ground for direct current network expansion correlation one after another
Study carefully, and make some progress.
In all kinds of key equipments needed for constituting direct current network, high-power DC converter is undoubtedly direct current network
Support technology, serve the effect of transformer in similar AC network.In recent years, with modular multi-level converter
(Modular Multilevel Converter, MMC) is the maturation of the high pressure flexible direct current technology of transmission of electricity of representative, is applied
In being developed to commutator transformer, to play, the good redundancy of modular multi-level converter, switching frequency are low, loss is small, defeated
Go out the advantages of harmonic wave is few, as new technology trends, but from the point of view of being fruitful, the correlative study of this class formation is still in
Initial stage, the also relevant report without actual industrial model machine, and still there is in power system capacity and reliability certain bottle
Neck, it is difficult to adapt to the application demand of Width funtion no-load voltage ratio in direct current network.
Document " A Versatile DC-DC Converter for Energy Collection and
Distribution using the Modular Multilevel Converter " propose a kind of based on traditional MMC's first
The topology conception of DC converter, but become higher application scenario in DC voltage, the both sides of intermediate-frequency transformer can be caused to become
Than excessive, and excessive low-pressure side electric current needs thicker coiling, is unfavorable for the coiling of intermediate-frequency transformer, and due to current
The maximum capacity of monomer intermediate-frequency transformer is about 5MW, therefore it is further using single intermediate-frequency transformer to also limit its capacity
Lifting.
Patent of invention " discloses one in the electric power electric transformer CN104638940A " based on many level of cascade moduleization
Kind of primary side is connected using multiple MMC, and secondary side seals in using H bridges submodule is in parallel and goes out formula (Input-Series
Output-Parallel, ISOP) DC converter, although having disperseed AC energy, the coiling for reducing intermediate-frequency transformer is difficult
Degree, but because DC parallel output end voltage grade is relatively low, can be only applied to the larger situation of no-load voltage ratio.
Therefore, research is had using distributed isolation intermediate-frequency transformer and the Novel DC transformation topology with Width funtion no-load voltage ratio
There is important practical significance.
The content of the invention
Goal of the invention：For problem above, the present invention proposes a kind of symmetrical twin-stage for reversely eliminating ability certainly with circulation
Join DC converting unit.
Technical scheme：To realize the purpose of the present invention, the technical solution adopted in the present invention is：One kind has circulation reverse
DC converting unit, including the first cascade module and the second cascade module, two level gang moulds are cascaded from the symmetric double of the ability of elimination
The input series connection of block, output end is also connected.Each cascade module includes the modular multilevel inverter of primary side, intermediate frequency
The modular multilevel rectifier of transformer and secondary side；The exchange end of primary side modular multilevel inverter becomes through intermediate frequency
Depressor is connected to the exchange end of secondary side modular multilevel rectifier.
The loop pressure drops that modular multilevel inverter and modular multilevel rectifier in each cascade module are produced
It can cancel out each other, realize circulation reversely from elimination.
Modular multilevel inverter and modular multilevel rectifier are constituted by four bridge arms of two-phase, each bridge arm by
Several half-bridge submodules and a bridge arm inductance are composed in series.Each half-bridge submodule is anti-simultaneously by the switching device of two groups of series connection
Two fly-wheel diode compositions of connection, each fly-wheel diode inverse parallel is at each switching device two ends, series switching devices two ends
A sub- module capacitance in parallel.
A kind of DC converter, including some symmetric doubles with circulation reversely from elimination ability cascade DC converting list
Member, input side and outlet side carry out connection in series-parallel combination, have 4 kinds of structures, the input side series connection of DC converting unit, outlet side string
Connection；The input side series connection of DC converting unit, outlet side is in parallel；The input side of DC converting unit is in parallel, outlet side series connection；Directly
The input side for flowing converter unit is in parallel, and outlet side is in parallel.
Beneficial effect：DC converting unit is carried out various forms of connection in series-parallel modular combinations by the present invention to be applicable
In the high-power DC converter of different voltage class, direct current network is accessed, the purpose of direct current interconnection is finally reached.This hair
It is bright to transmit power dissipation, it is to avoid to be become using the single intermediate frequency that may turn into system application bottleneck in high-voltage large-capacity occasion
Depressor, therefore compare the advantage that traditional MMC type DC converter has intermediate-frequency transformer to be more easy to coiling.The present invention uses symmetric double
Cascade structure, can make the circulation in each cascade module produced by two MMC reversely from elimination by control；Again because using
The structure that MMC is combined with connection in series-parallel modular combination, can be achieved the DC converting of wider no-load voltage ratio.
Brief description of the drawings
Fig. 1 is that the symmetric double of the present invention with circulation reversely from elimination ability cascades DC converting unit；
Fig. 2 is modular multilevel inverter MMCl and modular multilevel rectifier MMC2 circuit topology figure；
Fig. 3 is the circuit topology figure of half-bridge submodule；
Fig. 4 is the overall schematic diagram of DC converting unit of the present invention；
Fig. 5 is single-phase MMC circulation equivalent circuit diagram；
Fig. 6 is the circulation equivalent circuit diagram of DC converting unit；
Fig. 7 (a) is to seal in go here and there out formula DC converter；Fig. 7 (b) is to seal in and go out formula DC converter；Fig. 7 (c) is simultaneously
Enter to go here and there out formula DC converter；Fig. 7 (d) is to be incorporated to and go out formula DC converter.
Embodiment
Technical scheme is further described with reference to the accompanying drawings and examples.
It is that the symmetric double of the present invention with circulation reversely from elimination ability cascades DC converting list as shown in Figure l
Member, is made up of two symmetrical cascade modules, including the first cascade module l and the second cascade module 2, two cascade modules it is defeated
Enter end series connection, input voltage is Vin, output end also connects, and output voltage is Vout.First cascade module 1 and the second cascade module 2
In, including the modular multilevel inverter MMC1 of the primary side being sequentially connected by circuit, intermediate-frequency transformer and secondary side
Modular multilevel rectifier MMC2；Primary side MMC1 exchanges end and is connected to secondary side MMC2 exchanges end through intermediate-frequency transformer；Level
Gang mould block is by the half V of DC converting unit input direct voltagein/ 2 are reverse into exchange through MMCl, become through no-load voltage ratio for k intermediate frequency
Depressor carries out alternating voltage conversion, is then rectified into the half V that DC converting unit exports DC voltage through MMC2out/2；Intermediate frequency
Transformer provides electrical isolation simultaneously.
It is modular multilevel inverter MMC1 and modular multilevel rectifier MMC2 structure chart as shown in Figure 2, the
In one cascade module l and the second cascade module 2, modular multilevel inverter MMC1 is made up of four bridge arms of two-phase, Mei Geqiao
Arm is by N number of half-bridge submodule and a bridge arm inductance LpIt is composed in series；Modular multilevel rectifier MMC2 is by four bridges of two-phase
Arm is constituted, and each bridge arm is by M half-bridge submodule and a bridge arm inductance LsIt is composed in series.
Half-bridge submodule SM circuit diagram as shown in Figure 3, each half-bridge submodule by two groups of series connection switching device
One switching tube S1, second switch pipe S2Two the first diode of fly-wheel diode D of inverse parallel1, the second diode D2Composition, each
Fly-wheel diode inverse parallel is at each switching device two ends, one sub- module capacitance C of series switching devices two ends parallel connection.Pass through control
Switching device S processed1、S2Break-make, submodule can be operated in：(1) state is put into；Now S1Conducting, S2Shut-off, submodule
Electric capacity is according to the different charge or discharge in bridge arm current direction, and submodule output voltage is capacitance voltage value Uc；(2) shape is cut off
State；Now S1Shut-off, S2Conducting, bridge arm current can only be from S2Or sustained diode2Middle flowing, submodule electric capacity does not access main electricity
Road, capacitance voltage keeps stable, and submodule output voltage is 0.By certain modulation and control mode, control submodule is being thrown
Enter or cut off State Transferring, it is possible to so that MMC ac output end produces the output voltage of many level waveforms, and realize MMC
Four quadrant running.
It is the overall schematic diagram of the present invention as shown in Figure 4, MMC four quadrant running feature ensure that the DC converting unit
Can be with way traffic；It can be seen that because the present invention is using the progress power dissipation transmission of multiple intermediate-frequency transformers, therefore compare
Traditional MMC type DC converter is avoided using single intermediate-frequency transformer so as to which transformer is difficult to the defect of coiling.
It is single-phase MMC circulation equivalent circuit diagram as shown in Figure 5, MMC current transformers have circulation problem, it can be seen that a
Mutually generate driving voltage u of the frequency for twice of fundamental frequency2fa, b phases generate driving voltage of the frequency for twice of fundamental frequency
u2fb, under the excitation of the two voltages, each own two frequency multiplication circulation i between two-phase and DC side2fa、i2fbCirculation.
It is the circulation equivalent circuit diagram of the DC converting unit of the present invention as shown in Figure 6, it can be seen from the Circulation Model, by
Connected in MMC1 with MMC2, if encouraged by the circulation driving voltage and the circulation that MMC1 is produced for necessarily controlling to produce MMC2
Voltage swing equal direction inside DC converting unit on the contrary, just can realize circulation from elimination.
The present invention is subjected to multi-form connection in series-parallel modular combination, DC converter schematic diagram, such as Fig. 7 is obtained.In figure
By n DC converting units of the present invention (DC converting unit 1, DC converting unit 2 ... DC converting unit n's)
Input side and outlet side carry out connection in series-parallel combination, have 4 kinds of structures, and Fig. 7 (a) the seal in formula of going here and there out, Fig. 7 (b) are sealed in and gone out
Formula, Fig. 7 (c) the be incorporated to formula of going here and there out, Fig. 7 (d) are incorporated to and go out formula.
V in Fig. 7DC1For the input direct voltage value of DC converter, Vin1、Vin2、…VinnRespectively DC converting unit
1st, DC converting unit 2 ... DC converting unit n input direct voltage value；VDC2For the output DC voltage of DC converter
Value, Vout1、Vout2、…VoutnRespectively DC converting unit l, DC converting unit 2 ... DC converting unit n output direct current
Magnitude of voltage.Power transmission and voltage transformation by each DC converting unit, the DC converter realize that voltage class is VDC1's
Dc bus is V with voltage classDC2Dc bus between direct current interconnection.
Different connection in series-parallel combined systems have different application scenarios：The system of going here and there out is sealed in suitable for input voltage and output electricity
Press higher occasion；Seal in and go out system and be applied to the occasion that input voltage is higher and output current is larger；It is incorporated to go here and there out and is
System is applied to the occasion that input voltage is relatively low and output voltage is higher, is incorporated to and goes out system suitable for the larger field of output current
Close.Additionally due to MMC has modular combination feature in itself, can be by the submodule quantity N or MMC2 for changing MMCl submodule
Number of blocks M adapts to the DC voltage of different voltage class, therefore voltage change ratio wider range that the present invention is applicable.In addition,
Due to having been realized in circulation inside DC converting unit from elimination, the circulation of the DC converter combined through connection in series-parallel
Suppressed.
Claims (9)
1. a kind of reversely cascade DC converting unit with circulation from the symmetric double of the ability of elimination, it is characterised in that：Including first
Cascade module and the second cascade module, the input series connection of two cascade modules, output end are also connected.
2. according to claim 1 reversely cascade DC converting unit with circulation from the symmetric double of the ability of elimination, it is special
Levy and be：Each cascade module includes the mould of modular multilevel inverter, intermediate-frequency transformer and the secondary side of primary side
Block multi-level rectifier；The exchange end of primary side modular multilevel inverter is connected to secondary side module through intermediate-frequency transformer
Change the exchange end of multi-level rectifier.
3. according to claim 2 reversely cascade DC converting unit with circulation from the symmetric double of the ability of elimination, it is special
Levy and be：The loop pressure drops that modular multilevel inverter and modular multilevel rectifier in each cascade module are produced can
To cancel out each other, realize circulation reversely from elimination.
4. according to claim 2 reversely cascade DC converting unit with circulation from the symmetric double of the ability of elimination, it is special
Levy and be：Modular multilevel inverter and modular multilevel rectifier are constituted by four bridge arms of two-phase, each bridge arm by
Several half-bridge submodules and a bridge arm inductance are composed in series.
5. according to claim 4 reversely cascade DC converting unit with circulation from the symmetric double of the ability of elimination, it is special
Levy and be：Each half-bridge submodule is made up of two fly-wheel diodes of switching device inverse parallel of two groups of series connection, each afterflow two
Pole pipe inverse parallel is at each switching device two ends, one sub- module capacitance of series switching devices two ends parallel connection.
6. a kind of DC converter, it is characterised in that：Including having circulation reversely from elimination energy described in some claim l-5
The symmetric double cascade DC converting unit of power, the input side series connection of DC converting unit, outlet side series connection.
7. a kind of DC converter, it is characterised in that：Including having circulation reversely from elimination energy described in some claim l-5
The symmetric double cascade DC converting unit of power, the input side series connection of DC converting unit, outlet side is in parallel.
8. a kind of DC converter, it is characterised in that：Including having circulation reversely from elimination energy described in some claim 1-5
The symmetric double cascade DC converting unit of power, the input side of DC converting unit is in parallel, outlet side series connection.
9. a kind of DC converter, it is characterised in that：Including having circulation reversely from elimination energy described in some claim l-5
The symmetric double cascade DC converting unit of power, the input side of DC converting unit is in parallel, and outlet side is in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710231229.XA CN106998145A (en) | 2017-04-10 | 2017-04-10 | Reversely DC converting unit is cascaded with circulation from the symmetric double of the ability of elimination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710231229.XA CN106998145A (en) | 2017-04-10 | 2017-04-10 | Reversely DC converting unit is cascaded with circulation from the symmetric double of the ability of elimination |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106998145A true CN106998145A (en) | 2017-08-01 |
Family
ID=59433914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710231229.XA Pending CN106998145A (en) | 2017-04-10 | 2017-04-10 | Reversely DC converting unit is cascaded with circulation from the symmetric double of the ability of elimination |
Country Status (1)
| Country | Link |
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| CN (1) | CN106998145A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3701625A4 (en) * | 2018-01-30 | 2020-12-30 | Huawei Technologies Co. Ltd. | Modular voltage converter |
| CN112332683A (en) * | 2020-11-10 | 2021-02-05 | 青岛鼎信通讯股份有限公司 | Power electronic transformer based on square wave converter |
| WO2022222950A1 (en) * | 2021-04-23 | 2022-10-27 | 南京南瑞继保电气有限公司 | Series-type multi-winding converter, direct current transformer, and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104283436A (en) * | 2014-09-24 | 2015-01-14 | 华中科技大学 | Combined type MMC type direct current transformer based on transformer coupling |
| JP5721096B2 (en) * | 2010-08-23 | 2015-05-20 | 国立大学法人東京工業大学 | Power converter |
| CN104638940A (en) * | 2015-03-02 | 2015-05-20 | 东南大学 | Modular multi-level power electronic transformer based on cascading |
| CN105515401A (en) * | 2015-11-30 | 2016-04-20 | 武汉大学 | Solid state transformer in modularized multi-level structure |
-
2017
- 2017-04-10 CN CN201710231229.XA patent/CN106998145A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5721096B2 (en) * | 2010-08-23 | 2015-05-20 | 国立大学法人東京工業大学 | Power converter |
| CN104283436A (en) * | 2014-09-24 | 2015-01-14 | 华中科技大学 | Combined type MMC type direct current transformer based on transformer coupling |
| CN104638940A (en) * | 2015-03-02 | 2015-05-20 | 东南大学 | Modular multi-level power electronic transformer based on cascading |
| CN105515401A (en) * | 2015-11-30 | 2016-04-20 | 武汉大学 | Solid state transformer in modularized multi-level structure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3701625A4 (en) * | 2018-01-30 | 2020-12-30 | Huawei Technologies Co. Ltd. | Modular voltage converter |
| CN112332683A (en) * | 2020-11-10 | 2021-02-05 | 青岛鼎信通讯股份有限公司 | Power electronic transformer based on square wave converter |
| WO2022222950A1 (en) * | 2021-04-23 | 2022-10-27 | 南京南瑞继保电气有限公司 | Series-type multi-winding converter, direct current transformer, and control method |
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