CN108173442A - Isolated form Modular multilevel converter based on High Frequency Link technology - Google Patents
Isolated form Modular multilevel converter based on High Frequency Link technology Download PDFInfo
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- CN108173442A CN108173442A CN201810047646.3A CN201810047646A CN108173442A CN 108173442 A CN108173442 A CN 108173442A CN 201810047646 A CN201810047646 A CN 201810047646A CN 108173442 A CN108173442 A CN 108173442A
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- switch pipe
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- high frequency
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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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
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
Abstract
The invention discloses a kind of isolated form Modular multilevel converter based on High Frequency Link technology, converter is three-phase system structure, is made of single stage type high-frequency isolation type submodule；High voltage direct current port P is connected in parallel on including threeH、NHBetween phase element, each phase element is made of upper and lower two bridge arms, the Electricity Federation contact N of the upper and lower bridge arm of three phase elements1、N2、N3It is high-voltage alternating port a, b, c after lead-out wire series filtering inductance, each bridge arm is by n sigle-stage AC formula high-frequency isolation type submodule and a bridge arm reactor LmComposition；Single stage type high-frequency isolation type submodule includes prime part, high frequency transformer portion and rear class part, the primary side of the exchange side connection high frequency transformer of prime part.High Frequency Link technology is combined by the present invention with modular multilevel technology, so that each module high voltage side no longer needs capacitance to support and Pressure and Control, while the problems such as also overcome the change of current of traditional single stage formula converter secondary side, due to voltage spikes.
Description
Technical field
The present invention relates to isolated form modular multilevel power conversion technology fields, and in particular to one kind is based on High Frequency Link skill
The isolated form Modular multilevel converter of art.
Background technology
Isolated form mesohigh alternating current-direct current mixing transformation technology will be in Future New Energy Source alternating current-direct current hybrid intelligent power grid, high-power
Motor driving plays an important role with fields such as naval vessel electric drive.Current widely used Cascade H bridge type, modular multilevel become
Parallel operation (MMC) type topological structure belongs to two-stage type power conversion system, is that each module independent direct current side needs greatly there are problem
Amount electric capacity of voltage regulation fluctuates to buffer monophase system secondary power so that device volume is big, power density is low, with high costs；Simultaneously
Each intermodule is unbalanced there are voltage, needs complicated voltage balancing control, reduces system reliability.
Invention content
To solve the above problems, the present invention provides a kind of isolated form modular multilevel transformation based on High Frequency Link technology
High Frequency Link technology is combined by device with modular multilevel technology, so that each module high voltage side no longer needs capacitance to support
And Pressure and Control, while the problems such as also overcome the change of current of traditional single stage formula converter secondary side, due to voltage spikes, there is high pressure to hand over
Three stream, high voltage direct current and low-voltage direct basic ports.
To achieve the above object, the technical solution taken of the present invention is：
Isolated form Modular multilevel converter based on High Frequency Link technology, the converter are three-phase system structure, by
Single stage type high-frequency isolation type submodule is formed；
High voltage direct current port P is connected in parallel on including threeH、NHBetween phase element, each phase element is by upper and lower two bridge arms
Composition, the Electricity Federation contact N of the upper and lower bridge arm of three phase elements1、N2、N3It is high-voltage alternating port after lead-out wire series filtering inductance
A, b, c, each bridge arm is by n sigle-stage AC formula high-frequency isolation type submodule and a bridge arm reactor LmComposition；
The single stage type high-frequency isolation type submodule includes prime part, high frequency transformer portion and rear class part, prime
The primary side of partial exchange side connection high frequency transformer, the secondary of the exchange side connection high frequency transformer of rear class part, Mei Gedan
The positive and negative electrode port of the prime part of grade formula high-frequency isolation type submodule is in parallel respectively to be used as common low pressure DC port PL、NL,
The port high voltage direct current side ports P in series of rear class partH、NH；
The positive terminal P of bridge arm on three phase elementsHa、PHb、PHcThe anode being connected as the high voltage direct current port of the converter
PH, the negative pole end N of three 2 lower bridge arms of phase elementHa、NHb、NHcThe cathode N being connected as the high voltage direct current port of the converterH, two
Pole together constitutes the high voltage direct current port P of this topological structureH、NH。
Further, the prime part of the single stage type high-frequency isolation type submodule includes low-pressure side DC capacitor CdcLWith
The active H bridges being made of four active switches (such as IGBT) with anti-paralleled diode；Rear class part includes voltage clamping
Circuit 7 and the active H bridges being made of four active switches (such as IGBT) with anti-paralleled diode.
Further, the active H bridges of the prime part 4 include a first active switch pipe Q1, one second actively
Switching tube Q2, a third active switch pipe Q3With a 4th active switch pipe Q4, the collector difference of each active switch pipe
It is connected with the cathode of respective fly-wheel diode, anode of the emitter respectively with respective fly-wheel diode is connected；
First active switch pipe Q1With third active switch pipe Q3After series connection with the low-pressure side DC capacitor CdcLParallel connection, the
One active switch pipe Q1Emitter and third active switch pipe Q3Collector be connected and be used as high frequency transformer primary side end E,
Two active switch pipe Q2Emitter and the 4th active switch pipe Q4Collector be connected and be used as the another of high frequency transformer primary side
Hold F, the first active switch pipe Q1Collector and CdcLAnode be connected, third active switch pipe Q3Emitter and CdcLIt is negative
Extremely it is connected；Second active switch pipe Q2With the 4th active switch pipe Q4After series connection with the low-pressure side DC capacitor CdcLParallel connection, the
Two active switch pipe Q2Collector and CdcLAnode be connected, the 4th active switch pipe Q4Emitter and CdcLCathode be connected；
First active switch pipe Q1With the second active switch pipe Q2Collector and CdcLAnode be connected and be used as submodule block prefix portion
The anode A, third active switch pipe Q divided3With the 4th active switch pipe Q4Emitter and CdcLCathode be connected and be used as son
The cathode B of module prime part.
Further, the active H bridges of the rear class part include a 5th active switch pipe Q5, the 6th active open
Close pipe Q6, a 7th active switch pipe Q7, a 8th active switch pipe Q8, the collector of each active switch pipe respectively with
The cathode of respective fly-wheel diode is connected, and anode of the emitter respectively with respective fly-wheel diode is connected；5th master
Dynamic switching tube Q5Emitter and the 7th active switch pipe Q7Collector be connected and be used as high frequency transformer secondary end G, the 6th master
Dynamic switching tube Q6Emitter and the 8th active switch pipe Q8Collector be connected and be used as the other end H of high frequency transformer secondary；
5th active switch pipe Q5With the 6th active switch pipe Q6Collector be connected and be used as the anode C of submodule rear class part, the 7th
Active switch pipe Q7With the 8th active switch pipe Q8Emitter be connected and be used as the cathode D of submodule rear class part.
Further, the voltage clamp circuit includes a first diode D1, a second diode D2, one
Three diode D3, a 4th diode D4, a first capacitance C1, a first resistor R1, the first diode D1With the two or two
Pole pipe D3After series connection respectively with the first capacitance C1, first resistor R1Parallel connection, the second diode D2With the 4th diode D4Divide after series connection
Not with the first capacitance C1, first resistor R1Parallel connection, the first diode D1, the second diode D2Cathode and the first capacitance C1, first
Resistance R1Anode be connected, the second diode D2, the 4th diode D4Anode and the first capacitance C1, first resistor R1Cathode phase
Even, the first diode D1Anode and third diode D3Cathode, high frequency transformer secondary end G be connected, the second diode D2
Anode and the 4th diode D4Cathode, high frequency transformer secondary other end H is connected.
Further, the modulation ratio of upper and lower two bridge arms compares d for alternating current-direct current hybrid modulationuWith d1, wherein, duFor upper bridge arm
Modulation ratio, d1For lower bridge arm modulation ratio, while duWith d1By direct current common modulation modulation ratio d is mutually exchanged with every than Da、db、dcGroup
Into, wherein, daModulation ratio, d are exchanged for A phasesbModulation ratio, d are exchanged for B phasescModulation ratio is exchanged for C phases.
Further, high frequency transformer portion is made of a high frequency transformer T, and high frequency transformer can realize high-pressure side
The functions such as convert with the power transmission, electrical isolation, voltage class of low-pressure side；Bridge arm reactor LmIn addition to reducing bridge arm current
Outside percent harmonic distortion, alternate circulation and the short-circuit circulation of dc-side short-circuit fault generation can also be inhibited, protect the converter
Electronic power switch.Energy flexibly passes between the topological structure can realize three port of high-voltage alternating, high voltage direct current and low-voltage direct
It is defeated, it disclosure satisfy that the plurality of operating modes demand of Ac/dc Power Systems.
The invention has the advantages that：
(1) each high-frequency isolation type submodule high-pressure side does not have DC capacitor.The structure employs High Frequency Link technology, passes through son
The switch combination of module front stage active H bridge power tubes realizes high-pressure side pulsewidth modulation, which passes through height
Frequency power transformer is directly supported by prime part low-pressure side DC capacitor, therefore no longer needs capacitance branch in rear class partial high pressure side
Support；All two double frequency powers fluctuation of three-phase is transferred to common low pressure dc bus and cancels out each other, therefore is public low simultaneously
Dc bus is pressed also without a large amount of capacitance to support, compares traditional two-stage type isolated form alternating current-direct current mixing transformation system, it can
A large amount of electric capacity of voltage regulation are reduced, the volume of device is reduced, reduces cost, there is higher power density.
(2) converter does not need to independent voltage balancing control.The terminal voltage of each submodule passes through high frequency transformation
Device is directly vised by the busbar voltage of low-voltage direct side, and the stable state of upper and lower bridge arm terminal output voltage is consistent with dynamic characteristic, phase
The sample circuit cumbersome compared with MMC type and complicated Pressure and Control, the converter do not need to Pressure and Control, reduce answering for control
Polygamy also increases the reliability and economy of system simultaneously.
(3) converter does not need to two-way switch pipe.Since the high-pressure side port voltage of each submodule is always the just change
Parallel operation does not need to two-way switch pipe, avoids traditional single stage formula converter secondary side Commutation Problem and the due to voltage spikes of leakage inductance generation
Problem.
Description of the drawings
Fig. 1 is the isolated form Modular multilevel converter three-phase topology diagram based on High Frequency Link technology of the present invention；
Fig. 2 is the single phase element topology diagram of the present invention；
Fig. 3 is the high-frequency isolation type submodule topology diagram of the present invention；
In figure：PHHigh voltage direct current anode port；
NHHigh voltage direct current cathode port；
PLLow-voltage direct anode port；
NLLow-voltage direct cathode port；
A- high-voltage alternating A phases port；
B- high-voltage alternating B phases port；
C- high-voltage alternating C phases port；
SMnSubmodule, n are its quantity；
LmBridge arm reactor；
LfExchange side filter inductance；
N1-- a phase upper and lower bridge arm tie points；
N2- b phase upper and lower bridge arm tie points；
N3- c phase upper and lower bridge arm tie points；
CdcLLow-voltage direct capacitance；
T- high frequency transformers；
A, B- submodules block prefix part positive and negative electrode port；
C, D- submodules rear class part positive and negative electrode port；
E, F- high frequency transformers primary side side ports；
G, H- high frequency transformers secondary side ports；
Q1~Q4Prime part active switch pipe, such as insulated gate bipolar transistor (IGBT)；
Q5~Q8Rear class part active switch pipe, such as insulated gate bipolar transistor (IGBT)；
D1~D4Rear class portion voltage DC restorer diode；
C1Rear class portion voltage clamp circuit capacitance；
R1Voltage clamp circuit resistance in rear class part；
PHa、PHb、PHCThe anode port of upper bridge arm；
NHa、NHb、NHcThe negative pole end of _ lower bridge arm；
Pc、NcSubmodule rear class partial rectification bridge clamp circuit positive and negative anodes port.
Specific embodiment
In order to which objects and advantages of the present invention are more clearly understood, the present invention is carried out with reference to embodiments further
It is described in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit this hair
It is bright.
As shown in Figure 1, an embodiment of the present invention provides a kind of isolated form modular multilevel changes based on High Frequency Link technology
Parallel operation, the converter 1 include three identical phase elements 2, and each phase element is as shown in Fig. 2, be divided into upper and lower two bridges
Arm, and each bridge arm is by n submodule and a bridge arm reactor LmIt forms.
The present invention each single stage type high-frequency isolation type submodule 3 include prime part 4, high frequency transformer portion 5 and after
Grade part 6, the topological structure of submodule as shown in figure 3, the primary side of the high-frequency ac side connection high frequency transformer T of prime part,
The secondary of the high-frequency ac side connection high frequency transformer T of rear class part, is formed public after the prime side ports parallel connection of all submodules
Low-voltage direct side ports (P altogetherL、NL), rear class side ports high voltage direct current side ports (P in seriesH、NH), bridge on three phase elements
Positive terminal (the P of armHa、PHb、PHc) be connected as the converter high voltage direct current port anode PH,Similar, three phase elements
Negative pole end (the N of lower bridge armHa、NHb、NHc) be connected as the converter high voltage direct current port cathode NH.Prime part includes 4
A active switch pipe (such as IGBT) Q with anti-paralleled diode1~Q4The H bridges of composition and low-pressure side DC capacitor CdcL, rear class
Active switch pipe (such as IGBT) Q that part carries anti-paralleled diode comprising 45~Q8H bridges and the voltage clamping electricity of composition
Road, the active pipe Q with anti-paralleled diode1~Q8Collector respectively with the cathode phase of respective fly-wheel diode
Connection, anode of the emitter respectively with respective fly-wheel diode are connected.
Q in prime part1With Q3After series connection with the low-pressure side DC capacitor CdcLParallel connection, the Q1Emitter and Q3's
Collector is connected and is used as high frequency transformer primary side end E, Q2Emitter and Q4Collector be connected and be used as high frequency transformer former
The other end F, Q on side1Collector and CdcLAnode be connected, Q3Emitter and CdcLCathode be connected；The Q2With Q4Series connection
Afterwards with the low-pressure side DC capacitor CdcLParallel connection, Q2Collector and CdcLAnode be connected, Q4Emitter and CdcLCathode
It is connected；The Q1、Q2Collector and CdcLAnode be connected and be used as single stage type high-frequency isolation type submodule block prefix part
Anode port A, Q3、Q4Emitter and CdcLCathode be connected and be used as the cathode port B of submodule block prefix part.
Q in rear class part5Emitter and Q7Collector be connected and be used as high frequency transformer secondary end G, Q6Emitter
And Q8Collector be connected and be used as the other end H of high frequency transformer secondary；The Q5、Q6Collector be connected and be used as submodule
Anode the port C, Q of block rear class part7、Q8Emitter be connected and be used as the cathode port D of submodule rear class part.Rear class portion
Voltage clamp circuit (7) includes capacitance C in point1, resistance R1, 4 diode Q1~D4, the D1With D3After series connection respectively with C1、R1
Parallel connection, the D2With D4After series connection respectively with C1、R1Parallel connection, D1、D2Cathode and C1、R1Anode be connected, D2、D4Anode with
C1、R1Cathode be connected, D1Anode and D3Cathode, high frequency transformer secondary end G be connected, D2Anode and D4Cathode,
High frequency transformer secondary other end H is connected.
When this converter works, the modulation ratio of upper and lower bridge arm submodule compares d for alternating current-direct current hybrid modulationuWith d1(duIt is upper
Bridge arm modulation ratio, d1For lower bridge arm modulation ratio), while duWith d1By direct current common modulation modulation ratio (d is mutually exchanged with every than Da、db、
dc) composition.
By taking a phases as an example, when HVDC Modulation ratio is 0.5, damZero need to be more than or equal to and meet formula (1) less than or equal to 0.5.
Meanwhile as shown in Fig. 2, the rear class part output port voltage of each submodule is always just high voltage direct current port
Voltage, high-voltage alternating port voltage, low-voltage direct port voltage meet formula (2).
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, several improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
1. the isolated form Modular multilevel converter based on High Frequency Link technology, it is characterised in that：The converter (1) is three-phase
System structure is made of single stage type high-frequency isolation type submodule (3)；
High voltage direct current port (P is connected in parallel on including threeH、NH) between phase element (2), each phase element (2) is by upper and lower two
Bridge arm forms, the Electricity Federation contact (N of the upper and lower bridge arm of three phase elements1、N2、N3) handed over for high pressure after lead-out wire series filtering inductance
Flow port (a, b, c), each bridge arm is by n sigle-stage AC formula high-frequency isolation type submodule (3) and a bridge arm reactor LmGroup
Into；
The single stage type high-frequency isolation type submodule (3) includes prime part (4), high frequency transformer portion (5) and rear class part
(6), the primary side of the exchange side connection high frequency transformer of prime part, the pair of the exchange side connection high frequency transformer of rear class part
Side, the positive and negative electrode port of the prime part of each single stage type high-frequency isolation type submodule (3) are in parallel straight as common low pressure respectively
Flow port (PL、NL), the port high voltage direct current side ports (P in series of rear class partH、NH)；
Positive terminal (the P of bridge arm on three phase elements (2)Ha、PHb、PHc) the connected high voltage direct current port as the converter is just
Pole PH, the negative pole end (N of three phase element (2) lower bridge armsHa、NHb、NHc) be connected as the converter high voltage direct current port bear
Pole NH。
2. the isolated form Modular multilevel converter based on High Frequency Link technology as described in claim 1, it is characterised in that：Institute
The prime part (4) for stating single stage type high-frequency isolation type submodule includes low-pressure side DC capacitor CdcLInverse parallel is carried with by four
The active H bridges of the active switch composition of diode；Rear class part (6) carries instead simultaneously including voltage clamp circuit (7) and by four
The active H bridges of the active switch composition of union II pole pipe.
3. the isolated form Modular multilevel converter based on High Frequency Link technology as claimed in claim 2, it is characterised in that：Institute
The active H bridges for stating prime part (4) include a first active switch pipe Q1, a second active switch pipe Q2, a third master
Dynamic switching tube Q3With a 4th active switch pipe Q4, the collector of each active switch pipe respectively with respective fly-wheel diode
Cathode be connected, anode of the emitter respectively with respective fly-wheel diode is connected；
First active switch pipe Q1With third active switch pipe Q3After series connection with the low-pressure side DC capacitor CdcLParallel connection, the first master
Dynamic switching tube Q1Emitter and third active switch pipe Q3Collector be connected and be used as high frequency transformer primary side end E, the second master
Dynamic switching tube Q2Emitter and the 4th active switch pipe Q4Collector be connected and be used as the other end F of high frequency transformer primary side,
First active switch pipe Q1Collector and CdcLAnode be connected, third active switch pipe Q3Emitter and CdcLCathode phase
Even；Second active switch pipe Q2With the 4th active switch pipe Q4After series connection with the low-pressure side DC capacitor CdcLParallel connection, the second master
Dynamic switching tube Q2Collector and CdcLAnode be connected, the 4th active switch pipe Q4Emitter and CdcLCathode be connected；First
Active switch pipe Q1With the second active switch pipe Q2Collector and CdcLAnode be connected and be used as submodule block prefix part
Anode A, third active switch pipe Q3With the 4th active switch pipe Q4Emitter and CdcLCathode be connected and be used as submodule
The cathode B of prime part.
4. the isolated form Modular multilevel converter based on High Frequency Link technology as claimed in claim 2, it is characterised in that：Institute
The active H bridges for stating rear class part (6) include a 5th active switch pipe Q5, a 6th active switch pipe Q6, one the 7th master
Dynamic switching tube Q7, a 8th active switch pipe Q8, the collector of each active switch pipe respectively with respective fly-wheel diode
Cathode is connected, and anode of the emitter respectively with respective fly-wheel diode is connected；5th active switch pipe Q5Emitter
With the 7th active switch pipe Q7Collector be connected and be used as high frequency transformer secondary end G, the 6th active switch pipe Q6Emitter
With the 8th active switch pipe Q8Collector be connected and be used as the other end H of high frequency transformer secondary；5th active switch pipe Q5With
6th active switch pipe Q6Collector be connected and be used as the anode C, the 7th active switch pipe Q of submodule rear class part7With the 8th
Active switch pipe Q8Emitter be connected and be used as the cathode D of submodule rear class part.
5. the isolated form Modular multilevel converter based on High Frequency Link technology as claimed in claim 2, it is characterised in that：Institute
It states voltage clamp circuit (7) and includes a first diode D1, a second diode D2, a third diode D3, one
Four diode D4, a first capacitance C1, a first resistor R1, the first diode D1With the second diode D3After series connection respectively with
First capacitance C1, first resistor R1Parallel connection, the second diode D2With the 4th diode D4After series connection respectively with the first capacitance C1, first
Resistance R1Parallel connection, the first diode D1, the second diode D2Cathode and the first capacitance C1, first resistor R1Anode be connected,
Two diode D2, the 4th diode D4Anode and the first capacitance C1, first resistor R1Cathode be connected, the first diode D1Sun
Pole and third diode D3Cathode, high frequency transformer secondary end G be connected, the second diode D2Anode and the 4th diode
D4Cathode, high frequency transformer secondary other end H is connected.
6. the isolated form Modular multilevel converter based on High Frequency Link technology as claimed in claim 2, it is characterised in that：
The modulation ratio of upper and lower two bridge arms compares d for alternating current-direct current hybrid modulationuWith d1, wherein, duFor upper bridge arm modulation ratio, d1For lower bridge arm
Modulation ratio, while duWith d1By direct current common modulation modulation ratio (d is mutually exchanged with every than Da、db、dc) composition, wherein, daIntersect for A
Flow modulation ratio, dbModulation ratio, d are exchanged for B phasescModulation ratio is exchanged for C phases.
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| CN201810047646.3A CN108173442B (en) | 2018-01-18 | 2018-01-18 | Isolated modular multilevel converter based on high-frequency chain technology |
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| CN201810047646.3A CN108173442B (en) | 2018-01-18 | 2018-01-18 | Isolated modular multilevel converter based on high-frequency chain technology |
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| CN108173442B CN108173442B (en) | 2020-07-10 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108847777A (en) * | 2018-07-16 | 2018-11-20 | 东北电力大学 | Isolated form modularization cascade converter based on High Frequency Link technology |
| CN109639150A (en) * | 2018-12-28 | 2019-04-16 | 浙江华云清洁能源有限公司 | Isolated form Modular multilevel converter topological structure based on mixing module |
| CN109687514A (en) * | 2018-12-28 | 2019-04-26 | 浙江华云清洁能源有限公司 | The more low-voltage direct buses of high-frequency isolation type, which collect, presses grid-connected system in photovoltaic |
| CN111342690A (en) * | 2020-03-13 | 2020-06-26 | 南京理工大学 | Split capacitor power unit multilevel converter and modulation strategy thereof |
| CN113224967A (en) * | 2021-04-29 | 2021-08-06 | 东北电力大学 | AC-AC isolated modular converter based on low-voltage DC bus |
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