CN103762861B - N input single-phase 2N+2 switching group MMC rectifier and control method thereof - Google Patents
N input single-phase 2N+2 switching group MMC rectifier and control method thereof Download PDFInfo
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Abstract
The invention provides an N input single-phase 2N+2 switching group MMC rectifier and a control method of the N input single-phase 2N+2 switching group MMC rectifier. The rectifier comprises N alternating-current inputting power supplies, N alternating-current inductors, a first bridge arm, a second bridge arm and a rectification output end load. Each of the first bridge arm and the second bridge arm is formed by connecting N+1 switching groups and two inductors in series. The ith switches in the first bridge arm and the second bridge arm are formed by connecting N power switching units in series and i is selected between 1 and N+1. The two ends of the kth alternating-current power supply serve as the kth circuit input, wherein k is selected between 1 and N and N is larger than two. The rectifier is controlled through carrier phase-shifting PWM, the N inputting alternating-current power supplies are converted into alternating-current inputting of N circuits of 2n+1 levels and after currents are rectified and overlapped, the load is powered. In an MMC power switching unit, the voltage stress borne by each switching tube is only one nth of the voltage of the direct-current power supplies and the problem of voltage sharing of the switching tubes is well solved. The N input single-phase 2N+2 switching group MMC rectifier is applicable to multiple-alternating-current-power-supply-inputting, high-voltage and large-power occasions.
Description
Technical field
The present invention relates to block combiner multi-level converter (MMC) field, be specifically related to a kind of N input
Single-phase 2N+2 switches set MMC rectifier and control method thereof.
Background technology
Power rectifier forward miniaturization, high reliability and low-loss direction are developed, under this trend at present
Two kinds of directions improving commutator occur: reduce passive device or improvement rectifier topology structure has to reduce
Source device is as the new development reducing active device direction.Single-phase 2N+2 switching rectifier is relative to traditional
4N switching rectifier decreases 2N-2 switch and corresponding drive circuit, should consider cost and volume
Certain advantage is occupied in.But, the single-phase input in N road of 2N+2 switching rectifier is converted into two electricity
Flat, input AC waveform comparison is poor.Additionally, the voltage stress that in 2N+2 switch, each switch bears is
The half of DC bus-bar voltage, and there is the voltage-sharing of 2N+2 switching tube, this significantly limit list
Phase 2N+2 switching rectifier is in high pressure and the application of large-power occasions.
In recent years, multilevel technology is constantly promoted, and has been successfully applied in such as high-voltage dc transmission
The industrial circles such as electricity, Electric Drive, active power filtering, Static Synchronous compensation, how electric the most common voltage-type is
Flat rectifier topology is broadly divided into case bit-type and the big class of unit cascaded type two.Block combiner multi-level converter
(Modular Multilevel Converter, MMC) is topological as a kind of novel many level, except tool
The advantage having traditional multi-level commutator, block combiner multi-level rectifier uses Modular Structure Design, just
In System Expansion and redundancy of effort；Having off-center operation ability, fault traversing and recovery capability, system can
High by property；Owing to having common DC bus, block combiner multi-level rectifier is particularly suited for HVDC
Transmission system is applied.But, when alternating current circuit connected of N bar different frequency, need 2N MMC
Commutator, this significantly increases engineering cost.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, propose a kind of N without direct current biasing
Input single-phase 2N+2 switches set MMC rectifier and control method thereof.
The technical solution used in the present invention is as follows.
N input single-phase 2N+2 switches set MMC rectifier includes N number of alternating current input power supplying, N number of exchange
Inductance, the first brachium pontis, the second brachium pontis and load；Described first brachium pontis is by N+1 switches set and 2 electricity
Sense is in series, and described second brachium pontis is in series by N+1 switches set and 2 inductance；First brachium pontis
I-th switches set be in series by n power switch unit, the i-th switches set of the second brachium pontis is by n
Individual power switch unit is in series, and wherein the value of i is 1～N+1；The two of kth alternating current input power supplying
Holding and input as kth road, wherein the value of k is 1～N, and N > 2, n are positive integer.
In above-mentioned N input single-phase 2N+2 switches set MMC rectifier, two inductance phases of the first brachium pontis
Mutual coupling, constitutes a pair coupling inductance；Two inductance of the second brachium pontis intercouple, and constitute a pair coupling electricity
Sense.
In above-mentioned N input single-phase 2N+2 switches set MMC rectifier, described N input single-phase 2N+2
In switches set MMC rectifier, the lower end of the 1st switches set of the first brachium pontis and 2 electricity in the first brachium pontis
One end of first inductance of sense connects, the other end of the first inductance of the first brachium pontis and the 2nd of the first brachium pontis the
The upper end of individual switches set connects；The lower end of the i-th switches set of the first brachium pontis and the i+1 of the first brachium pontis
The upper end of switches set connects, and wherein the value of i is 2～N-1；The lower end of the n-th switches set of the first brachium pontis
It is connected with one end of the second inductance of the first brachium pontis, the other end of the second inductance of the first brachium pontis and the first brachium pontis
N+1 switches set upper end connect；The circuit structure of the second brachium pontis and the circuit structure of the first brachium pontis
Completely the same；One end of kth alternating current input power supplying connects with the upper end of+1 switches set of kth of the first brachium pontis
Connecing, the other end of kth alternating current input power supplying is connected with one end of kth AC inductance, and kth exchanges
The upper end of the other end of inductance and+1 switches set of kth of the second brachium pontis connects, and wherein the value of k is
1～N-1；One end of n-th alternating current input power supplying is connected with the lower end of the n-th switches set of the first brachium pontis,
The other end of n-th alternating current input power supplying is connected with one end of n-th AC inductance, n-th alternating current
The lower end of the other end of sense and the n-th switches set of the second brachium pontis connects；1st switch of the first brachium pontis
The upper end of group is connected with the 1st upper end of switches set, one end of load of the second brachium pontis, the other end of load
With the lower end of n-th switches set of the first brachium pontis, the lower end of the n-th switches set of the second brachium pontis, hold
Connect.
In above-mentioned N input single-phase 2N+2 switches set MMC rectifier, power switch unit is opened by first
Guan Guan, second switch pipe, the first diode, the second diode and electric capacity are constituted.Wherein, the positive pole of electric capacity
It is connected with colelctor electrode, the negative electrode of the first diode of the first switching tube, the emitter stage of the first switching tube and first
The anode of diode, the colelctor electrode of second switch pipe, the negative electrode of the second diode connect, second switch pipe
The negative pole of emitter stage and the anode of the second diode, electric capacity connects；The colelctor electrode of second switch pipe is as first
Outfan, the emitter stage of second switch pipe is as the second outfan.
In above-mentioned N input single-phase 2N+2 switches set MMC rectifier, the i-th switch of the first brachium pontis
Second outfan of the jth power switch unit of group and the jth+1 of the i-th switches set of the first brachium pontis
First outfan of power switch unit connects, and wherein j value is 1～n-1, and i value is 1～N+1；Second
Second outfan of the jth power switch unit of the i-th switches set of brachium pontis and the i-th of the first brachium pontis
First outfan of+1 power switch unit of jth of switches set connects.
In the control method of above-mentioned N input single-phase 2N+2 switches set MMC rectifier, carrier wave is used to move
Phase PWM controls each switches set of the first brachium pontis and each switching tube of each switches set of the second brachium pontis
Open and turn off；I-th switches set (the B of the first brachium pontis0i) jth power switch unit (SMB0ij)
I-th switches set (B with the second brachium pontis1i) jth power switch unit (SMB1ij) all use phase
With triangular wave as jth carrier wave Cj, wherein the value of j is 1～n；N carrier wave (C1、C2、…、
Cn) 360 °/n of lagging phase angle successively；Kth alternating current input power supplying (uSk) the end (a of the first brachium pontisk)
Use the kth sine wave R of the first brachium pontisSakSuperposition kth direct current biasing RdokObtain the of the first brachium pontis
K modulating wave RSak+Rdok, wherein the value of k is 1～N；Kth alternating current input power supplying (uSk)
End (the b of two brachium pontisk) use the kth sine wave R of the second brachium pontisSbkSuperposition kth direct current biasing Rdok
Obtain the kth modulating wave R of the second brachium pontisSbk+Rdok；The kth sine wave R of the first brachium pontisSakWith second
The kth sine wave R of brachium pontisSbkPhase 180 °.
In above-mentioned control method, the kth modulating wave R of the first brachium pontisSak+RdokWith jth carrier wave CjPass through
Kth comparator, as the kth modulating wave R of the first brachium pontisSak+RdokMore than jth carrier wave CjTime, the
K comparator output high level, as the kth modulating wave R of the first brachium pontisSak+RdokLess than jth carrier wave
CjTime, kth comparator output low level, wherein the value of k is 1～N；The output of the 1st comparator
The control of second switch pipe gate pole of jth power switch unit as the 1st switches set of the first brachium pontis
Level；The output of-1 comparator of kth is by-1 not gate of kth, the output of-1 not gate of kth and kth
The output of individual comparator obtains the jth merit of the kth switches set of the first brachium pontis by-1 XOR gate of kth
The control level of the second switch pipe gate pole of rate switch element, wherein the value of k is 2～N；N-th ratio
The jth power of N+1 the switches set that the output of relatively device obtains the first brachium pontis by n-th not gate is opened
Close the control level of the second switch pipe gate pole of unit；The kth modulating wave R of the second brachium pontisSbk+RdokWith
J carrier wave CjBy the N+k comparator, as the kth modulating wave R of the second brachium pontisSbk+RdokIt is more than
Jth carrier wave CjTime, the N+k comparator output high level, when the kth modulating wave of the second brachium pontis
RSbk+RdokLess than jth carrier wave CjTime, the N+k comparator output low level, the wherein value of k
It is 1～N；The output of N+1 comparator is opened as the jth power of the 1st switches set of the second brachium pontis
Close the control level of the second switch pipe gate pole of unit；The output of N+k-1 comparator is by N+k-1
Individual not gate, the output of N+k-1 not gate and the output of N+k comparator are by N-1+k-1
XOR gate obtains the second switch pipe gate pole of the jth power switch unit of the kth switches set of the second brachium pontis
Control level, wherein the value of k is 2～N；The output of 2*N comparator is non-by 2*N
Door obtains the second switch pipe gate pole of the jth power switch unit of N+1 switches set of the second brachium pontis
Control level.
The mode of operation of described N input single-phase 2N+2 switches set MMC rectifier includes with frequency mode of operation
With alien frequencies mode of operation, with in frequency mode of operation, the frequency of N road input is identical, and amplitude differs；Alien frequencies
In mode of operation, frequency and the amplitude of the input of N road are the most different.
Compared with prior art, the present invention have the advantage that for: N road three-phase alternating current input power is converted into
The 2n+1 level exchange input of N road, input current waveform is of high quality, each switch in power switch unit
The voltage stress that pipe bears is only the 1/n of DC bus-bar voltage, can guarantee that institute in commutator work process simultaneously
The voltage having switching tube to bear is equal, well solves the voltage-sharing of switching tube.Single-phase with existing
2N+2 switching rectifier compares, and N input single-phase 2N+2 switches set MMC provided by the present invention is whole
The N road three-phase alternating current input power of stream device is converted into the 2n+1 level exchange input of N road, input AC electricity
The quality of stream waveform is greatly improved.Additionally, the voltage stress born of each switching tube is only direct current
The 1/n of busbar voltage, and control method provided by the present invention makes all switching tubes in commutator work process
The voltage born is equal, well solves the voltage-sharing of switching tube, and this will be very beneficial for N input
Single-phase 2N+2 switches set MMC rectifier is in high pressure and the application of large-power occasions.With existing MMC
Commutator compares, and N input single-phase 2N+2 switches set MMC rectifier provided by the present invention has N
Road exchange input, can be directly used for N bar different frequency alternating current circuit be connected, greatly reduce work
Cheng Chengben.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of the N input single-phase 2N+2 switches set MMC rectifier of the present invention；
Fig. 2 is the power switch unit of the N input single-phase 2N+2 switches set MMC rectifier shown in Fig. 1
Circuit structure diagram；
Fig. 3 is phase-shifting carrier wave PWM of the N input single-phase 2N+2 switches set MMC rectifier shown in Fig. 1
Control structure figure；
Fig. 4 a, 4b are that three input single-phase eight switches set MMC rectifier work in respectively with frequency mode of operation
With the modulating wave under alien frequencies mode of operation；
Fig. 5 a, 5b are that three input single-phase eight switches set nine level MMC rectifier work in frequency Working mould
The simulation waveform figure of formula and alien frequencies mode of operation.
Detailed description of the invention
For present disclosure and feature are expanded on further, below in conjunction with the accompanying drawing specific embodiment party to the present invention
Case illustrates, but the enforcement of the present invention and protection are not limited to this.
With reference to Fig. 1, the N input single-phase 2N+2 switches set MMC rectifier of the present invention, including N number of friendship
Stream input power (uS1、uS2、…、uSN), N number of AC inductance (LS1、LS2、…、LSN), the first bridge
Arm, the second brachium pontis and load R；Described first brachium pontis is by N+1 switches set (B01、B02、…、B0(N+1))
With 2 inductance (L01、L02) be in series, described second brachium pontis is by N+1 switches set (B11、B12、…、
B1(N+1)) and 2 inductance (L11、L12) be in series；I-th switches set (the B of the first brachium pontis0i) by
N power switch unit (SMB0i1、SMB0i2、…、SMB0in) be in series, the i-th of the second brachium pontis
Individual switches set B1iBy n power switch unit (SMB1i1、SMB1i2、…、SMB1in) be in series,
Wherein the value of i is 1～N+1；Kth alternating current input power supplying uSkTwo ends as kth road input, its
The value of middle k is 1～N, N > 2.
1st switches set B of the first brachium pontis01Lower end p and the first inductance L of the first brachium pontis01One end even
Connect, the first inductance L of the first brachium pontis01The other end and the 2nd switches set B of the first brachium pontis02Upper end o
Connect；I-th switches set B of the first brachium pontis0iI+1 switches set B of lower end and the first brachium pontis0(i+1)
Upper end connect, wherein the value of i is 2～N-1；N-th switches set B of the first brachium pontis0NLower end with
Second inductance L of the first brachium pontis02One end connect, the second inductance L of the first brachium pontis02The other end and first
The N+1 switches set B of brachium pontis0(N+1)Upper end connect；The circuit structure of the second brachium pontis and the first brachium pontis
Circuit structure is completely the same；Kth alternating current input power supplying uSkThe kth+1 of one end and the first brachium pontis open
Pass group B0(k+1)Upper end connect, kth alternating current input power supplying uSkThe other end and kth AC inductance
LSkOne end connect, kth AC inductance LSkThe other end and+1 switches set of kth of the second brachium pontis
B1(k+1)Upper end connect, wherein the value of k is 1～N-1；N-th alternating current input power supplying uSNOne end with
N-th switches set B of the first brachium pontis0NLower end connect, n-th alternating current input power supplying uSNThe other end
With n-th AC inductance LSNOne end connect, n-th AC inductance LSNThe other end and the second brachium pontis
N-th switches set B1NLower end connect；1st switches set B of the first brachium pontis01Upper end and second
1st switches set B of brachium pontis11Upper end, load R one end connect, load R the other end and first
N-th switches set B of brachium pontis0NLower end, n-th switches set B of the second brachium pontis1NLower end, hold
G connects.
Fig. 2 illustrates the power switch list of the N input single-phase 2N+2 switches set MMC rectifier shown in Fig. 1
The circuit structure diagram of unit, power switch unit is by the first switching tube S1, second switch pipe S2, the first diode
D1, the second diode D2With electric capacity CSMConstitute.Wherein, electric capacity CSMPositive pole and the first switching tube S1
Colelctor electrode, the first diode D1Negative electrode connect, the first switching tube S1Emitter stage and the first diode
D1Anode, second switch pipe S2Colelctor electrode, the second diode D2Negative electrode connect, second switch pipe
S2Emitter stage and the second diode D2Anode, electric capacity CSMNegative pole connect；Second switch pipe S2's
Colelctor electrode is as the first outfan, second switch pipe S2Emitter stage as the second outfan.
As it is shown in figure 1, i-th switches set B of the first brachium pontis0iJth power switch unit SMB0ij
The second outfan and i-th switches set B of the first brachium pontis0i+ 1 power switch unit SM of jthB0i(j+1)
First outfan connect, wherein j value is 1～n-1, and i value is 1～N+1；The i-th of the second brachium pontis
The jth power switch unit SM of switches set B1iB1ijThe second outfan and the first brachium pontis i-th switch
Group B1i+ 1 power switch unit SM of jthB1i(j+1)First outfan connect.
Lingk road alternating current input power supplying isThen:
In formula, UoFor output voltage.
N input single-phase 2N+2 switches set MMC rectifier shown in Fig. 1 uses the control of phase-shifting carrier wave PWM
System, as shown in Figure 3.
Phase-shifting carrier wave PWM is used to control each switches set B of the first brachium pontis0iEach with the second brachium pontis opens
Pass group B1iThe opening and turning off of each switching tube, wherein i value is 1～N+1；The i-th of first brachium pontis
Individual switches set B0iJth power switch unit SMB0ijI-th switches set B with the second brachium pontis1i?
J power switch unit SMB1ijAll use identical triangular wave as jth carrier wave Cj, the wherein value of j
It is 1～n；N carrier wave C1、C2、…、Cn360 °/n of lagging phase angle successively；Kth alternating current input power supplying
uSkThe end a of the first brachium pontiskUse the kth sine wave R of the first brachium pontisSakSuperposition kth direct current biasing
RdokObtain the kth modulating wave R of the first brachium pontisSak+Rdok, wherein the value of k is 1～N；Kth is handed over
Stream input power uSkThe end b of the second brachium pontiskUse the kth sine wave R of the second brachium pontisSbkSuperposition kth
Individual direct current biasing RdokObtain the kth modulating wave R of the second brachium pontisSbk+Rdok；The kth of the first brachium pontis is just
String ripple RSakKth sine wave R with the second brachium pontisSbkPhase 180 °.
The kth modulating wave R of the first brachium pontisSak+RdokWith jth carrier wave CjBy kth comparator, when
The kth modulating wave R of the first brachium pontisSak+RdokMore than jth carrier wave CjTime, kth comparator output height
Level, as the kth modulating wave R of the first brachium pontisSak+RdokLess than jth carrier wave CjTime, kth compares
Device output low level, wherein the value of k is 1～N；The output of the 1st comparator is as the of the first brachium pontis
1 switches set B01Jth power switch unit SMB01jSecond switch pipe S2The control level of gate pole
SB01j；The output of-1 comparator of kth is by-1 not gate of kth, the output of-1 not gate of kth and kth
The output of individual comparator obtains kth switches set B of the first brachium pontis by-1 XOR gate of kth0kJth
Individual power switch unit SMB0kjSecond switch pipe S2Control level S of gate poleB0kj, the wherein value of k
It is 2～N；The output of n-th comparator obtains the N+1 switch of the first brachium pontis by n-th not gate
Group B0(N+1)Jth power switch unit SMB0(N+1)jSecond switch pipe S2The control level of gate pole
SB0(N+1)j；The kth modulating wave R of the second brachium pontisSbk+RdokWith jth carrier wave CjBy the N+k ratio
Relatively device, as the kth modulating wave R of the second brachium pontisSbk+RdokMore than jth carrier wave CjTime, N+k
Comparator output high level, as the kth modulating wave R of the second brachium pontisSbk+RdokLess than jth carrier wave Cj
Time, the N+k comparator output low level, wherein the value of k is 1～N；N+1 comparator
Export the 1st switches set B as the second brachium pontis11Jth power switch unit SMB11jSecond open
Close pipe S2Control level S of gate poleB11j；The output of N+k-1 comparator by the N+k-1 not gate,
The output of N+k-1 not gate is obtained by the N-1+k-1 XOR gate with the output of N+k comparator
Kth switches set B to the second brachium pontis1kJth power switch unit SMB1kjSecond switch pipe S2
Control level S of gate poleB1kj, wherein the value of k is 2～N；The output of 2*N comparator is by
2*N not gate obtains the N+1 switches set B of the second brachium pontis1(N+1)Jth power switch unit
SMB1(N+1)jSecond switch pipe S2Control level S of gate poleB1(N+1)j。
Described control method can ensure that each brachium pontis of described commutator is carved with n power when each and opens
Close the output voltage u of unitSMThe output voltage u of=E, N*n power switch unitSM=0, the most satisfiedWithWherein uB0iIt is the output voltage of the i-th switches set of the first brachium pontis,
uB1iBeing the output voltage of the i-th switches set of the second brachium pontis, E is each of the first brachium pontis and the second brachium pontis
The electric capacity C of each power switch unit of switches setSMVoltage, and have E=Uo/ n, i.e. power switch list
The voltage stress that in unit, each switching tube bears is only the 1/n of DC bus-bar voltage, can guarantee that commutator simultaneously
The voltage that in work process, all switching tubes bear is equal, well solves the voltage-sharing of switching tube.
As a example by three input single-phase eight switches set MMC rectifier, Fig. 4 a illustrates that it works in frequency work
1st modulating wave R of the first brachium pontis under patternSa1+Rdo1, the 2nd modulating wave R of the first brachium pontisSa2+Rdo2、
3rd modulating wave R of the first brachium pontisSa3+Rdo3With jth carrier wave CjRelation.From Fig. 4 a it can be seen that
1st sinusoidal wave R of the first brachium pontisSa1, the 2nd sinusoidal wave R of the first brachium pontisSa2With the first brachium pontis
3 sinusoidal wave RSa3Frequency identical, amplitude differs.Fig. 4 b illustrates that it works under alien frequencies mode of operation
1st modulating wave R of the first brachium pontisSa1+Rdo1, the 2nd modulating wave R of the first brachium pontisSa2+Rdo2, first
3rd modulating wave R of brachium pontisSa3+Rdo2With jth carrier wave CjRelation.It is seen from fig. 4b that the
1st sinusoidal wave R of one brachium pontisSa1, the 2nd sinusoidal wave R of the first brachium pontisSa2With the first brachium pontis the 3rd
Individual sinusoidal wave RSa3Frequency and amplitude all differ.1st modulating wave R of the second brachium pontisSb1+Rdo1,
2nd modulating wave R of two brachium pontisSb2+Rdo2, the 3rd modulating wave R of the second brachium pontisSb3+Rdo3With jth
Carrier wave CjRelation and the first brachium pontis the 1st modulating wave RSa1+Rdo1, the 2nd modulation of the first brachium pontis
Ripple RSa2+Rdo2, the 3rd modulating wave R of the first brachium pontisSa3+Rdo3With jth carrier wave CjThe complete phase of relation
With.
Fig. 5 a is that three input single-phases eight switches set nine level MMC rectifier (N=3, n=4) work in together
Frequently the simulation waveform figure of mode of operation, is the 1st alternating current input power supplying u successivelyS1, the 1st exchange input
The input u that power supply providesSS1, the 2nd alternating current input power supplying uS2, the 2nd alternating current input power supplying provide defeated
Enter uSS2, the 3rd alternating current input power supplying uS3, the input u that provides of the 3rd alternating current input power supplyingSS3, output
Voltage Uo, from the seen from Fig. 5 a the 1st alternating current input power supplying uS1, the 2nd alternating current input power supplying uS2With
3 alternating current input power supplying uS3Frequency identical, the 1st alternating current input power supplying uS1, the 2nd exchange input
Power supply uS2With the 3rd alternating current input power supplying uS3Amplitude differ；Fig. 5 b is three input single-phase eight switches
Organize nine level MMC rectifier and work in the simulation waveform figure of alien frequencies mode of operation, be the 1st exchange successively
Input power uS1, the input u that provides of the 1st alternating current input power supplyingSS1, the 2nd alternating current input power supplying uS2、
The input u that 2nd alternating current input power supplying providesSS2, the 3rd alternating current input power supplying uS3, the 3rd exchange defeated
Enter the input u that power supply providesSS3, output voltage Uo, from the seen from Fig. 5 b the 1st alternating current input power supplying uS1、
2nd alternating current input power supplying uS2With the 3rd alternating current input power supplying uS3Frequency and amplitude all differ.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by described reality
Execute the restriction of example, the change made under other any spirit without departing from the present invention and principle, modification,
Substitute, combine, simplify, all should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (8)
1.N input single-phase 2N+2 switches set MMC rectifier, it is characterised in that: include N number of alternating current input power supplying (u S1 、u S2 、…、u SN ), N number of AC inductance (L S1 、L S2 、…、L SN ), the first brachium pontis, the second brachium pontis and load (R)；Described first brachium pontis is by N+1 switches set (B01、B02、…、B0(N+1)) and 2 inductance (L 01 、L 02 ) be in series, described second brachium pontis is by N+1 switches set (B11、B12、…、B1(N+1)) and 2 inductance (L 11 、L 12 ) be in series；I-th switches set (the B of the first brachium pontis0i) by n power switch unit (SMB0i1、SMB0i2、…、SMB0in) be in series, the i-th switches set (B of the second brachium pontis1i) by n power switch unit (SMB1i1、SMB1i2、…、SMB1in) be in series, wherein the value of i is 1 ~ N+1；Kth alternating current input power supplying (u Sk ) two ends as kth road input, wherein the value of k is 1 ~ N, N > 2, n is positive integer；Kth alternating current input power supplying (u Sk )+1 switches set (B of kth of one end and the first brachium pontis0(k+1)) upper end connect, kth alternating current input power supplying (u Sk ) the other end and kth AC inductance (L Sk ) one end connect, kth AC inductance (L Sk ) the other end and+1 switches set (B of kth of the second brachium pontis1(k+1)) upper end connect, wherein the value of k is 1 ~ N-1；N-th alternating current input power supplying (u SN ) the n-th switches set (B of one end and the first brachium pontis0N) lower end connect, n-th alternating current input power supplying (u SN ) the other end and n-th AC inductance (L SN ) one end connect, n-th AC inductance (L SN ) the other end and the n-th switches set (B of the second brachium pontis1N) lower end connect；1st switches set (B of the first brachium pontis01) the 1st switches set (B of upper end and the second brachium pontis11) upper end, load (R) one end connect, load (R) the other end and the N+1 switches set (B of the first brachium pontis0N) lower end, the N+1 switches set (B of the second brachium pontis1N) lower end, hold (G) connect.
N input single-phase 2N+2 switches set MMC rectifier the most according to claim 1, it is characterised in that: two inductance of the first brachium pontis (L 01 、L 02 ) intercouple, constitute a pair coupling inductance；Two inductance of the second brachium pontis (L 11 、L 12 ) intercouple, constitute a pair coupling inductance.
N input single-phase 2N+2 switches set MMC rectifier the most according to claim 1, it is characterised in that: the 1st switches set (B of the first brachium pontis01) lower end (p) and the first brachium pontis in 2 inductance the first inductance (L 01 ) one end connect, the first inductance of the first brachium pontis (L 01 ) the other end and the 2nd switches set (B of the first brachium pontis02) upper end (o) connect；I-th switches set (the B of the first brachium pontis0i) i+1 the switches set (B of lower end and the first brachium pontis0(i+1)) upper end connect, wherein the value of i is 2 ~ N-1；N-th switches set (the B of the first brachium pontis0N) lower end and the first brachium pontis the second inductance (L 02 ) one end connect, the second inductance of the first brachium pontis (L 02 ) the other end and the N+1 switches set (B of the first brachium pontis0(N+1)) upper end connect；The circuit structure of the second brachium pontis and the circuit structure of the first brachium pontis are completely the same.
N input single-phase 2N+2 switches set MMC rectifier the most according to claim 1, it is characterised in that: power switch unit by the first switching tube (S 1 ), second switch pipe (S 2 ), the first diode (D 1 ), the second diode (D 2 ) and electric capacity (C SM ) constitute, wherein, electric capacity (C SM ) positive pole and the first switching tube (S 1 ) colelctor electrode, the first diode (D 1 ) negative electrode connect, the first switching tube (S1) emitter stage and the first diode (D 1 ) anode, second switch pipe (S 2 ) colelctor electrode, the second diode (D 2 ) negative electrode connect, second switch pipe (S 2 ) emitter stage and the second diode (D 2 ) anode, electric capacity (C SM ) negative pole connect；Second switch pipe (S 2 ) colelctor electrode as the first outfan, second switch pipe (S 2 ) emitter stage as the second outfan.
N input single-phase 2N+2 switches set MMC rectifier the most according to claim 1, it is characterised in that: the i-th switches set (B of the first brachium pontis0i) jth power switch unit (SMB0ij) the second outfan and the i-th switches set (B of the first brachium pontis0i)+1 power switch unit (SM of jthB0i(j+1)) first outfan connect, wherein j value be 1 ~ n-1, i value be 1 ~ N+1；I-th switches set (the B of the second brachium pontis1i) jth power switch unit (SMB1ij) the second outfan and the i-th switches set (B of the second brachium pontis1i)+1 power switch unit (SM of jthB1i(j+1)) first outfan connect.
N input single-phase 2N+2 switches set MMC rectifier the most according to claim 1, it is characterized in that: the mode of operation of commutator includes with frequency mode of operation and alien frequencies mode of operation, with in frequency mode of operation, the frequency of N number of alternating current input power supplying is identical, and amplitude differs；In alien frequencies mode of operation, frequency and the amplitude of N number of alternating current input power supplying are the most different.
7. for the control method of the N input single-phase 2N+2 switches set MMC rectifier described in claim 1, it is characterised in that: use phase-shifting carrier wave PWM to control each switches set (B of the first brachium pontis0i) and each switches set (B of the second brachium pontis1i) the opening and turning off of each switching tube, wherein i value is 1 ~ N+1；I-th switches set (the B of the first brachium pontis0i) jth power switch unit (SMB0ij) and the i-th switches set (B of the second brachium pontis1i) jth power switch unit (SMB1ij) all use identical triangular wave as jth carrier waveC j , wherein the value of j is 1 ~ n；N carrier wave (C 1 、C 2 、…、C n ) 360 °/n of lagging phase angle successively；Kth alternating current input power supplying (u Sk ) the first brachium pontis end (a k ) use the first brachium pontis kth sinusoidal waveR Sak Superposition kth direct current biasingR dok Obtain the kth modulating wave of the first brachium pontisR Sak +R dok , wherein the value of k is 1 ~ N；Kth alternating current input power supplying (u Sk ) the end (b of the second brachium pontisk) use the second brachium pontis kth sinusoidal waveR Sbk Superposition kth direct current biasingR dok Obtain the kth modulating wave of the second brachium pontisR Sbk +R dok ；The kth of the first brachium pontis is sinusoidal waveR Sak Sinusoidal wave with the kth of the second brachium pontisR Sbk Phase 180 °；Power switch unit by the first switching tube (S 1 ), second switch pipe (S 2 ), the first diode (D 1 ), the second diode (D 2 ) and electric capacity (C SM ) constitute, wherein, electric capacity (C SM ) positive pole and the first switching tube (S 1 ) colelctor electrode, the first diode (D 1 ) negative electrode connect, the first switching tube (S1) emitter stage and the first diode (D 1 ) anode, second switch pipe (S 2 ) colelctor electrode, the second diode (D 2 ) negative electrode connect, second switch pipe (S 2 ) emitter stage and the second diode (D 2 ) anode, electric capacity (C SM ) negative pole connect；Second switch pipe (S 2 ) colelctor electrode as the first outfan, second switch pipe (S 2 ) emitter stage as the second outfan.
Control method the most according to claim 7, it is characterised in that: the kth modulating wave of the first brachium pontisR Sak +R dok With jth carrier waveC j By kth comparator, when the kth modulating wave of the first brachium pontisR Sak +R dok More than jth carrier waveC j Time, kth comparator output high level, when the kth modulating wave of the first brachium pontisR Sak +R dok Less than jth carrier waveC j Time, kth comparator output low level, wherein the value of k is 1 ~ N；The output of the 1st comparator is as the 1st switches set (B of the first brachium pontis01) jth power switch unit (SMB01j) second switch pipe (S 2 ) gate pole control level (S B01j )；The output of-1 comparator of kth obtains the kth switches set (B of the first brachium pontis by the output of-1 not gate of kth, the output of-1 not gate of kth and kth comparator by-1 XOR gate of kth0k) jth power switch unit (SMB0kj) second switch pipe (S 2 ) gate pole control level (S B0kj ), wherein the value of k is 2 ~ N；The output of n-th comparator obtains the N+1 switches set (B of the first brachium pontis by n-th not gate0(N+1)) jth power switch unit (SMB0(N+1)j) second switch pipe (S 2 ) gate pole control level (S B0(N+1)j )；The kth modulating wave of the second brachium pontisR Sbk +R dok With jth carrier waveC j By the N+k comparator, when the kth modulating wave of the second brachium pontisR Sbk +R dok More than jth carrier waveC j Time, the N+k comparator output high level, when the kth modulating wave of the second brachium pontisR Sbk +R dok Less than jth carrier waveC j Time, the N+k comparator output low level, wherein the value of k is 1 ~ N；The output of N+1 comparator is as the 1st switches set (B of the second brachium pontis11) jth power switch unit (SMB11j) second switch pipe (S 2 ) gate pole control level (S B11j )；The output of N+k-1 comparator obtains the kth switches set (B of the second brachium pontis by the N+k-1 not gate, the output of N+k-1 not gate with the output of N+k comparator by the N-1+k-1 XOR gate1k) jth power switch unit (SMB1kj) second switch pipe (S 2 ) gate pole control level (S B1kj ), wherein the value of k is 2 ~ N；The output of 2*N comparator obtains the N+1 switches set (B of the second brachium pontis by the 2*N not gate1(N+1)) jth power switch unit (SMB1(N+1)j) second switch pipe (S 2 ) gate pole control level (S B1(N+1)j ).
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| CN201410042800.XA CN103762861B (en) | 2014-01-28 | 2014-01-28 | N input single-phase 2N+2 switching group MMC rectifier and control method thereof |
| PCT/CN2014/075997 WO2015113328A1 (en) | 2014-01-28 | 2014-04-22 | Multi-terminal high-voltage modular multilevel converter |
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| CN102013694A (en) * | 2010-07-22 | 2011-04-13 | 荣信电力电子股份有限公司 | Transformerless wind power generation grid-connected topology structure based on MMC |
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