CN103762870B - Double-input single-phase six-switch-block MMC rectifier and control method thereof - Google Patents
Double-input single-phase six-switch-block MMC rectifier and control method thereof Download PDFInfo
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- CN103762870B CN103762870B CN201410042758.1A CN201410042758A CN103762870B CN 103762870 B CN103762870 B CN 103762870B CN 201410042758 A CN201410042758 A CN 201410042758A CN 103762870 B CN103762870 B CN 103762870B
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Abstract
The invention provides a double-input single-phase six-switch-block MMC rectifier and a control method thereof. The rectifier comprises a first alternating-current input power supply, a second alternating-current input power supply, a first inductor, a second inductor, a first bridge arm, a second bridge arm and a rectification load. Each of the first bridge arm and the second bridge arm is formed by connecting an upper switch block, a middle switch block, a lower switch block ,a third inductor and a fourth inductor in series. The upper switch blocks, the middle switch blocks and the lower switch blocks of the first bridge arm and the second bridge arm are formed by connecting N power switch units in series. The rectifier is controlled through carrier phase-shifting PWM, and the two input alternating-current power supplies are converted into two circuits of alternating current input of the 2N+1 level, rectified and overlapped and provide power for the load. In addition, the voltage stress borne by each switching tube in each MMC power switch unit is only 1/N of the voltage of a direct-current power supply, the voltage sharing problem of the switching tubes is well solved, and the double-input single-phase six-switch-block MMC rectifier is suitable for high-voltage and large-power occasions where two single-phase alternating-current power supplies are input.
Description
Technical field
The present invention relates to block combiner multi-level converter (MMC) field, be specifically related to a kind of single-phase six switches of dual input
Group MMC rectifier and control method thereof.
Background technology
Power rectifier forward miniaturization, high reliability and low-loss direction are developed at present, occur two under this trend
Plant the direction improving commutator: reduce passive device or improvement rectifier topology structure has as minimizing to reduce active device
The new development of source device direction.Single-phase six switching rectifiers decrease a switch and phase relative to eight traditional switching rectifiers
The drive circuit answered, occupies certain advantage in considering the cost application with volume.But, the two-way list of six switching rectifiers
Input is converted into two level mutually, and the waveform comparison of input AC electric current is poor.Additionally, the electricity that in six switches, each switch bears
Compressive stress is the half of DC bus-bar voltage, and there is the voltage-sharing of six switches, and this significantly limit single-phase six switches
Commutator 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 D.C. high voltage transmission, electric power
The industrial circles such as transmission, active power filtering, Static Synchronous compensation, the most common voltage-type multi-level rectifier topology substantially can be divided
For case bit-type and the big class of unit cascaded type two.Block combiner multi-level converter (Modular Multilevel Converter,
MMC) as a kind of novel many level topology, except having the advantage of traditional multi-level commutator, the many level of block combiner are whole
Stream device uses Modular Structure Design, it is simple to System Expansion and redundancy of effort；There is off-center operation ability, fault traversing and extensive
Reactivation power, system reliability is high；Owing to having common DC bus, block combiner multi-level rectifier is particularly suited for high straightening
Stream transmission system application.But, when alternating current circuit connected of two different frequencies, needing 2 MMC rectifier, this is very big
Add 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 single-phase six switches set MMC of dual input
Commutator and control method thereof.
The technical solution used in the present invention is as follows:
The single-phase six switches set MMC rectifier of dual input include the first alternating current input power supplying, the second alternating current input power supplying, first
Inductance, the second inductance, the first brachium pontis, the second brachium pontis and load；Described first brachium pontis and the second brachium pontis by upper switches set, in open
Pass group, lower switches set, the 3rd inductance, the 4th inductance are in series；The upper switches set of the first brachium pontis is by N number of power switch unit string
Connection forms, and the breaker in middle group of the first brachium pontis is in series by N number of power switch unit, and the lower switches set of the first brachium pontis is by N number of merit
Rate switch element is in series, and the upper switches set of the second brachium pontis is in series by N number of power switch unit, opens in the second brachium pontis
Pass group is in series by N number of power switch unit, and the lower switches set of the second brachium pontis is in series by N number of power switch unit；The
The two ends of one alternating current input power supplying input as the first via, and the two ends of the second alternating current input power supplying input as the second tunnel, and N is just
Integer.
In the single-phase six switches set MMC rectifier of above-mentioned dual input, the 3rd inductance of the first brachium pontis and the 4th inductance are by coupling
Conjunction inductance substitutes, and the 3rd inductance of the second brachium pontis and the 4th inductance are substituted by coupling inductance.
In the single-phase six switches set MMC rectifier of above-mentioned dual input, the lower end of the upper switches set of the first brachium pontis and the first bridge
One end of 3rd inductance of arm connects, and the upper end of the other end of the 3rd inductance of the first brachium pontis and the breaker in middle group of the first brachium pontis is even
Connecing, the lower end of the breaker in middle group of the first brachium pontis is connected with one end of the 4th inductance of the first brachium pontis, the 4th inductance of the first brachium pontis
The other end and the first brachium pontis lower switches set upper end connect；The structure of the second brachium pontis and the structure complete of the first brachium pontis
Cause；One end of first alternating current input power supplying is connected with the upper end of the breaker in middle group of the first brachium pontis, the first alternating current input power supplying another
One end is connected with one end of the first inductance, and the upper end of the other end of the first inductance and the breaker in middle group of the second brachium pontis connects；Second
One end of alternating current input power supplying is connected with the lower end of the breaker in middle group of the first brachium pontis, the other end of the second alternating current input power supplying and
One end of two inductance connects, and the lower end of the other end of the second inductance and the breaker in middle group of the second brachium pontis connects；First brachium pontis upper
The upper end of switches set is connected with the upper end of upper switches set, one end of load of the second brachium pontis, the other end of load and the first brachium pontis
The lower end of lower switches set, the second brachium pontis lower switches set lower end, hold connection.
In the single-phase six switches set MMC rectifier of above-mentioned dual input, power switch unit includes the first switching tube, second opens
Guan Guan, the first diode, the second diode and electric capacity；Wherein, the positive pole of electric capacity and the colelctor electrode of the first switching tube, the one or two pole
The negative electrode of pipe connects, the emitter stage of the first switching tube and the anode of the first diode, the colelctor electrode of second switch pipe, the two or two pole
The negative electrode of pipe connects, and the negative pole of the emitter stage of second switch pipe and the anode of the second diode, electric capacity connects；Second switch pipe
Colelctor electrode is as the first outfan, and the emitter stage of second switch pipe is as the second outfan.
In the single-phase six switches set MMC rectifier of above-mentioned dual input, the of the jth power switch unit of each switches set
First outfan of+1 power switch unit of two outfans and jth is connected, and wherein the value of j is 1～N-1.
The control method of the single-phase six switches set MMC rectifier of above-mentioned dual input is, uses phase-shifting carrier wave PWM to control each
The opening and turning off of the switching tube of switches set；Under the jth power switch unit of the upper switches set of the first brachium pontis, the first brachium pontis
Under the jth power switch unit of switches set, the jth power switch unit of upper switches set of the second brachium pontis and the second brachium pontis
The jth power switch unit of switches set uses identical triangular wave as jth carrier wave Cj, wherein the value of j is 1～N；N number of
Carrier wave 360 °/N of lagging phase angle successively；The upper switches set of the first brachium pontis uses primary sinusoid Ra1Superposition the first direct current biasing Rdoa
The first modulating wave R as the first brachium pontisa1+Rdoa, the lower switches set of the first brachium pontis uses the second sinusoidal wave Rb1Superposition second is straight
Stream biasing RdobThe second modulating wave R as the first brachium pontisb1+Rdob, the upper switches set of the second brachium pontis uses the 3rd sinusoidal wave Ra2Folded
Add the first direct current biasing RdoaThe first modulating wave R as the second brachium pontisa2+Rdoa, the lower switches set of the second brachium pontis is just using the 4th
String ripple Rb2Superposition the second direct current biasing RdobThe second modulating wave R as the second brachium pontisb2+Rdob；Primary sinusoid Ra1With the 3rd just
String ripple Ra2Frequency identical and phase contrast is 180 °, the second sinusoidal wave Rb1With the 4th sinusoidal wave Rb2Frequency is identical and phase contrast
It it is 180 °.
First modulating wave R of the first brachium pontisa1+RdoaWith jth carrier wave CjThe upper of the first brachium pontis is obtained by the first comparator
The control level of the second switch pipe gate pole of the jth power switch unit of switches set, when the first modulating wave of the first brachium pontis is adjusted
Ripple R processeda1+RdoaMore than jth carrier wave CjTime, the first comparator output high level, when the first modulating wave modulating wave of the first brachium pontis
Ra1+RdoaLess than jth carrier wave CjTime, the first comparator output low level, wherein the value of j is 1～N；The second of first brachium pontis
Modulating wave Rb1+RdobWith jth carrier wave CjThe jth power switch of the lower switches set of the first brachium pontis is obtained by the second comparator
The control level of the second switch pipe gate pole of unit, as the second modulating wave R of the first brachium pontisb1+RdobLess than jth carrier wave CjTime,
Second comparator output high level, as the second modulating wave R of the first brachium pontisb1+RdobMore than jth carrier wave CjTime, the second comparator
Output low level；The control level of the second switch pipe gate pole of the jth power switch unit of the upper switches set of the first brachium pontis and
The control level of the second switch pipe gate pole of the jth power switch unit of the lower switches set of the first brachium pontis passes through the first XOR gate
The control level of second switch pipe gate pole in the jth power switch unit of the breaker in middle group obtaining the first brachium pontis；Second brachium pontis
The first modulating wave Ra2+RdoaWith jth carrier wave CjThe jth merit of the upper switches set of the second brachium pontis is obtained by the 3rd comparator
The control level of second switch pipe gate pole in rate switch element, as the first modulating wave R of the second brachium pontisa2+RdoaCarry more than jth
Ripple CjTime, the 3rd comparator output high level, as the first modulating wave R of the second brachium pontisa2+RdoaLess than jth carrier wave CjTime, the
Three comparator output low levels；Second modulating wave R of the second brachium pontisb2+RdobWith jth carrier wave CjObtained by the 4th comparator
The control level of the second switch pipe gate pole of the jth power switch unit of switches set under second brachium pontis, when the of the second brachium pontis
Two modulating wave Rb2+RdobLess than jth carrier wave CjTime, the 4th comparator output high level, when the second modulating wave of the second brachium pontis
Rb2+RdobMore than jth carrier wave CjTime, the 4th comparator output low level；The jth power of the upper switches set of the second brachium pontis is opened
Close under the control level of second switch pipe gate pole in unit and the second brachium pontis the second of the jth power switch unit of switches set to open
Close the control level of pipe gate pole obtained by the second XOR gate the second brachium pontis breaker in middle group jth power switch unit the
The control level of two switching tube gate poles；The control level of second switch pipe gate pole in each power switch unit of each switches set
The control level of the first switching tube gate pole in this power switch unit is obtained after anti-phase.
Mode of operation includes that with in frequency pattern, the first via inputs and the electricity of the second tunnel input with frequency pattern and alien frequencies pattern
Voltage-frequency rate is identical, and voltage magnitude differs；In alien frequencies pattern, first via input is equal with the electric voltage frequency of the second tunnel input and amplitude
Different.
Compared with prior art, the present invention have the advantage that for: two-way single phase ac input power is converted into two-way 2N+
1 level exchange input, input current waveform is of high quality；The voltage stress that in power switch unit, each switching tube bears is only
The 1/N of DC bus-bar voltage, can guarantee that the voltage that in commutator work process, all switching tubes bear is equal simultaneously, well solves
Determine the voltage-sharing of switching tube.Compared with existing single-phase six switching rectifiers, dual input provided by the present invention is single-phase
The two-way single phase ac input power of six switches set MMC rectifier is converted into the exchange input of two-way 2N+1 level, input current
The quality of waveform is greatly improved.Additionally, the voltage stress born of each switching tube is only the 1/ of DC bus-bar voltage
N, and control method provided by the present invention makes the voltage that in commutator work process, all switching tubes bear equal, well solves
Having determined the voltage-sharing of switching tube, this will be very beneficial for the single-phase six switches set MMC rectifier of dual input at high pressure and high-power
The application of occasion.Compared with existing MMC rectifier, the single-phase six switches set MMC rectifier of dual input provided by the present invention
Have two-way exchange input, can be directly used for two different frequencies alternating current circuit be connected, greatly reduce engineering cost.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of the single-phase six switches set MMC rectifier of dual input of the present invention；
Fig. 2 is the circuit structure diagram of the power switch unit of the single-phase six switches set MMC rectifier of the dual input shown in Fig. 1；
Fig. 3 is the phase-shifting carrier wave PWM control structure figure of the single-phase six switches set MMC rectifier of the dual input shown in Fig. 1；
Fig. 4 a, 4b are that the single-phase six switches set MMC rectifier of the dual input shown in Fig. 1 work in respectively with frequency pattern and alien frequencies
Modulating wave under pattern；
Fig. 5 a, 5b are that the single-phase six switches set five level MMC rectifier of dual input work in frequency pattern and alien frequencies pattern
Simulation waveform figure.
Detailed description of the invention
For present disclosure and feature are expanded on further, below in conjunction with accompanying drawing, specific embodiments of the present invention are carried out
Illustrate.But the enforcement of the present invention is not limited to this.
With reference to Fig. 1, the single-phase six switches set MMC rectifier of dual input of the present invention, including the first alternating current input power supplying ua,
Two alternating current input power supplying ub, the first inductance La, the second inductance Lb, the first brachium pontis, the second brachium pontis and load R；Described first brachium pontis and
Second brachium pontis is by upper switches set (H1、H2), breaker in middle group (M1、M2), lower switches set (L1、L2), the 3rd inductance (LH1、LH2),
Four inductance (LL1、LL2) be in series；Upper switches set H of the first brachium pontis1By N number of power switch unit (SMH11、SMH12、…、
SMH1N) be in series, breaker in middle group M of the first brachium pontis1By N number of power switch unit (SMM11、SMM12、…、SMM1N) series connection and
Become, lower switches set L of the first brachium pontis1By N number of power switch unit (SML11、SML12、…、SML1N) be in series, the second brachium pontis
Upper switches set H2By N number of power switch unit (SMH21、SMH22、…、SMH2N) be in series, breaker in middle group M of the second brachium pontis2
By N number of power switch unit (SMM21、SMM22、…、SMM2N) be in series, lower switches set L of the second brachium pontis2Opened by N number of power
Close unit (SML21、SML22、…、SML2N) be in series；First alternating current input power supplying uaTwo ends as the first via input, second
Alternating current input power supplying ubTwo ends input as the second tunnel.
Upper switches set H of the first brachium pontis1Lower end p and the 3rd inductance L of the first brachium pontisH1One end connect, the first brachium pontis
The 3rd inductance LH1The other end and breaker in middle group M of the first brachium pontis1Upper end o connect, breaker in middle group M of the first brachium pontis1's
Lower end and the 4th inductance L of the first brachium pontisL1One end connect, the 4th inductance L of the first brachium pontisL1The other end and the first brachium pontis
Lower switches set L1Upper end connect；The structure of the second brachium pontis is completely the same with the structure of the first brachium pontis；First exchange input electricity
Source uaBreaker in middle group M of one end and the first brachium pontis1Upper end connect, the first alternating current input power supplying uaThe other end and first electricity
Sense LaOne end connect, the first inductance LaThe other end and breaker in middle group M of the second brachium pontis2Upper end connect；Second exchange input
Power supply ubBreaker in middle group M of one end and the first brachium pontis1Lower end connect, the second alternating current input power supplying ubThe other end and second
Inductance LbOne end connect, the second inductance LbThe other end and breaker in middle group M of the second brachium pontis2Lower end connect；First brachium pontis
Upper switches set H1Upper switches set H of upper end and the second brachium pontis1Upper end, one end of load R connect, the other end and the of load R
Lower switches set L of one brachium pontis1Lower end, lower switches set L of the second brachium pontis1Lower end, hold n to connect.
Fig. 2 illustrates the circuit structure of the power switch unit of the single-phase six switches set MMC rectifier of the dual input shown in Fig. 1,
Including the first switching tube S1, second switch pipe S2, the first diode D1, the second diode D2With electric capacity CSM；Wherein, electric capacity CSM's
Positive pole and the first switching tube S1Colelctor electrode, the first diode D1Negative electrode connect, the first switching tube S1Emitter stage and the one or two
Pole pipe D1Anode, second switch pipe S2Colelctor electrode, the second diode D2Negative electrode connect, second switch pipe S2Emitter stage
With the second diode D2Anode, electric capacity CSMNegative pole connect；Second switch pipe S2Colelctor electrode as the first outfan, second
Switching tube S2Emitter stage as the second outfan.
As it is shown in figure 1, the second outfan of the jth power switch unit of each switches set and+1 power switch of jth
First outfan of unit connects, and wherein the value of j is 1～N-1.
The first via input voltage is made to beSecond road input voltage is
Then:
In formula, UoFor output voltage.
The single-phase six switches set MMC rectifier of dual input shown in Fig. 1 use phase-shifting carrier wave PWM to control, as shown in Figure 3.
Upper switches set H of the first brachium pontis1Jth power switch unit SMH1j, lower switches set L of the first brachium pontis1Jth
Individual power switch unit SML1j, upper switches set H of the second brachium pontis2Jth power switch unit SMH2jWith under the second brachium pontis
Switches set L2Jth power switch unit SML2jUse identical triangular wave as jth carrier wave Cj, wherein the value of j be 1～
N；N number of carrier wave C1、C2、…、CN360 °/N of lagging phase angle successively；Upper switches set H of the first brachium pontis1Use primary sinusoid Ra1Folded
Add the first direct current biasing RdoaThe first modulating wave R as the first brachium pontisa1+Rdoa, lower switches set L of the first brachium pontis1Use second
Sinusoidal wave Rb1Superposition the second direct current biasing RdobThe second modulating wave R as the first brachium pontisb1+Rdob, the upper switches set of the second brachium pontis
H2Use the 3rd sinusoidal wave Ra2Superposition the first direct current biasing RdoaThe first modulating wave R as the second brachium pontisa2+Rdoa, the second brachium pontis
Lower switches set L2Use the 4th sinusoidal wave Rb2Superposition the second direct current biasing RdobThe second modulating wave R as the second brachium pontisb2+
Rdob；Primary sinusoid Ra1With the 3rd sinusoidal wave Ra2Frequency identical and phase contrast is 180 °, the second sinusoidal wave Rb1With the 4th just
String ripple Rb2Frequency identical and phase contrast is 180 °.
First modulating wave R of the first brachium pontisa1+RdoaWith jth carrier wave CjThe first brachium pontis is obtained by the first comparator 301
Upper switches set H1Jth power switch unit SMH1jSecond switch pipe S2Control level S of gate poleH1j, when the first brachium pontis
The first modulating wave Ra1+RdoaMore than jth carrier wave CjTime, the first comparator output high level, when the first modulation of the first brachium pontis
Ripple Ra1+RdoaLess than jth carrier wave CjTime, the first comparator output low level, wherein the value of j is 1～N；The of first brachium pontis
Two modulating wave Rb1+RdobWith jth carrier wave CjLower switches set L of the first brachium pontis is obtained by the second comparator1Jth power
Switch element SML1jSecond switch pipe S2Control level S of gate poleL1j, as the second modulating wave R of the first brachium pontisb1+RdobIt is less than
Jth carrier wave CjTime, the second comparator 302 exports high level, as the second modulating wave R of the first brachium pontisb1+RdobCarry more than jth
Ripple CjTime, the second comparator output low level；Upper switches set H of the first brachium pontis1Jth power switch unit SMH1jSecond
Switching tube S2Control level S of gate poleH1jLower switches set L with the first brachium pontis1Jth power switch unit SML1jSecond open
Close pipe S2Control level S of gate poleL1jBreaker in middle group M of the first brachium pontis is obtained by the first XOR gate 3051Jth power open
Close cell S MM1jMiddle second switch pipe S2Control level S of gate poleM1j；First modulating wave R of the second brachium pontisa2+RdoaCarry with jth
Ripple CjUpper switches set H of the second brachium pontis is obtained by the 3rd comparator 3032Jth power switch unit SMH2jMiddle second switch
Pipe S2Control level S of gate poleH2j, as the first modulating wave R of the second brachium pontisa2+RdoaMore than jth carrier wave CjTime, the 3rd compares
Device output high level, as the first modulating wave R of the second brachium pontisa2+RdoaLess than jth carrier wave CjTime, the 3rd comparator exports low electricity
Flat；Second modulating wave R of the second brachium pontisb2+RdobWith jth carrier wave CjObtain switching under the second brachium pontis by the 4th comparator 304
Group L2Jth power switch unit SML2jSecond switch pipe S2Control level S of gate poleL2j, when the second tune of the second brachium pontis
Ripple R processedb2+RdobLess than jth carrier wave CjTime, the 4th comparator output high level, as the second modulating wave R of the second brachium pontisb2+
RdobMore than jth carrier wave CjTime, the 4th comparator output low level；Upper switches set H of the second brachium pontis2Jth power switch
Cell S MH2jMiddle second switch pipe S2Control level S of gate poleH2jWith switches set L under the second brachium pontis2Jth power switch unit
SML2jSecond switch pipe S2Control level S of gate poleL2jBreaker in middle group M of the second brachium pontis is obtained by the second XOR gate 3062's
Jth power switch unit SMM2jSecond switch pipe S2Control level S of gate poleM2j；Each power switch of each switches set
Second switch pipe S in unit2The first switching tube S in this power switch unit is obtained after the control level of gate pole is anti-phase1The control of gate pole
Level processed.
Described control method can ensure that upper switches set H of the first brachium pontis of described inverter1, the breaker in middle of the first brachium pontis
Group M1Lower switches set L with the first brachium pontis1The output voltage u of N number of power switch unit is had in each momentSM=E, total 2N
The output voltage u of individual power switch unitSM=0, i.e. meet uH1+uM1+uL1=Uo；Ensure upper switches set H of the second brachium pontis2, second
Breaker in middle group M of brachium pontis2Lower switches set L with the second brachium pontis2The output voltage of N number of power switch unit is had in each moment
uSM=E, the output voltage u of total 2N power switch unitSM=0, i.e. meet uH2+uM2+uL2=Uo；Wherein uH1、uM1、uL1Respectively
It it is upper switches set H of the first brachium pontis1, breaker in middle group M of the first brachium pontis1Lower switches set L with the first brachium pontis1Output voltage,
uH2、uM2、uL2It is respectively upper switches set H of the second brachium pontis2, breaker in middle group M of the second brachium pontis2Lower switches set L with the second brachium pontis2
Output voltage, E is the electric capacity C of each power switch unit of each switches setSMVoltage, and E=Uo/ N, i.e. power switch
The voltage stress that in unit, each switching tube bears is only the 1/N of DC bus-bar voltage, can guarantee that commutator work process simultaneously
In the voltage that bears of all switching tubes equal, well solve the voltage-sharing of switching tube.
Fig. 4 a illustrates that the single-phase six switches set MMC rectifier of dual input work in the first modulating wave of the first brachium pontis under CF pattern
Ra1+Rdoa, the second modulating wave R of the first brachium pontisb1+RdobWith jth carrier wave CjRelation.From Fig. 4 a it can be seen that the first brachium pontis
The primary sinusoid identical with the electric voltage frequency of the second sine wave of the first brachium pontis, and the primary sinusoid of the first brachium pontis and first
Second sinusoidal magnitude maximum of brachium pontis is 1, and wherein the value of j is 1～N.Fig. 4 b illustrates single-phase six switches set MMC of dual input
Commutator works in the first modulating wave R of the first brachium pontis under DF patterna1+Rdoa, the second modulating wave R of the first brachium pontisb1+RdobWith
Jth carrier wave CjRelation.It is seen from fig. 4b that the second sine wave of the primary sinusoid of the first brachium pontis and the first brachium pontis
Electric voltage frequency differs, and the maximum of the voltage magnitude of the second sine wave of the primary sinusoid of the first brachium pontis and the first brachium pontis
And be 1/2.First modulating wave R of the second brachium pontisa2+RdoaThe first modulating wave R with the first brachium pontisa1+RdoaWith jth carrier wave Cj
Relation identical, the second modulating wave R of the second brachium pontisb2+RdobThe second modulating wave R with the first brachium pontisb1+RdobWith jth
Carrier wave CjRelation identical.
Fig. 5 a is the simulation waveform figure that single-phase six switches set nine level MMC rectifier N=4 of dual input work in frequency pattern,
It is the voltage u of the first alternating current source successivelya, first alternating current source provide input voltage uaa, the voltage u of the second alternating current sourceb, second hand over
The input voltage u that stream source providesbbWith output voltage Uo, from the voltage u of the first alternating current source seen from Fig. 5 aaElectricity with the second alternating current source
Pressure ubFrequency identical, the voltage u of the first alternating current sourceaVoltage u with the second alternating current sourcebCurrent amplitude differ；Fig. 5 b is double
Input single-phase six switches set nine level MMC rectifier works in the simulation waveform figure of alien frequencies pattern, is the first alternating current source successively
Voltage ua, first alternating current source provide input voltage uaa, the voltage u of the second alternating current sourceb, second alternating current source provide input voltage
ubbWith output voltage Uo, from the voltage u of the first alternating current source seen from Fig. 5 baVoltage u with the second alternating current sourcebFrequency and amplitude equal
Differ.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by described embodiment
Limit, the change made under other any spirit without departing from the present invention and principle, modify, substitute, combine, simplify,
All should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (7)
1. the single-phase six switches set MMC rectifier of dual input, it is characterised in that: include the first alternating current input power supplying (u a ), second exchange
Input power (u b ), the first inductance (L a ), the second inductance (L b ), the first brachium pontis, the second brachium pontis and rectification load (R)；Described first
Brachium pontis and the second brachium pontis are by upper switches set (H1、H2), breaker in middle group (M1、M2), lower switches set (L1、L2), the 3rd inductance (L H1 、L H2 ), the 4th inductance (L L1 、L L2 ) be in series；Upper switches set (the H of the first brachium pontis1) by N number of power switch unit (SMH11、
SMH12、…、SMH1N) be in series, the breaker in middle group (M of the first brachium pontis1) by N number of power switch unit (SMM11、SMM12、…、
SMM1N) be in series, the lower switches set (L of the first brachium pontis1) by N number of power switch unit (SML11、SML12、…、SML1N) series connection
Form, the upper switches set (H of the second brachium pontis2) by N number of power switch unit (SMH21、SMH22、…、SMH2N) be in series, second
Breaker in middle group (the M of brachium pontis2) by N number of power switch unit (SMM21、SMM22、…、SMM2N) be in series, open under the second brachium pontis
Pass group (L2) by N number of power switch unit (SML21、SML22、…、SML2N) be in series；First alternating current input power supplying (u a ) two
Hold and input as the first via, the second alternating current input power supplying (u b ) two ends input as the second tunnel, N is positive integer；
Upper switches set (the H of the first brachium pontis1) lower end (p) and the first brachium pontis the 3rd inductance (L H1 ) one end connect, the first bridge
3rd inductance of arm (L H1 ) the other end and the breaker in middle group (M of the first brachium pontis1) upper end (o) connect, the first brachium pontis is opened
Pass group (M1) lower end and the first brachium pontis the 4th inductance (L L1 ) one end connect, the 4th inductance of the first brachium pontis (L L1 ) another
End and the lower switches set (L of the first brachium pontis1) upper end connect；The structure of the second brachium pontis is completely the same with the structure of the first brachium pontis；
First alternating current input power supplying (u a ) the breaker in middle group (M of one end and the first brachium pontis1) upper end connect, the first alternating current input power supplying
(u a ) the other end and the first inductance (L a ) one end connect, the first inductance (L a ) the other end and the breaker in middle group of the second brachium pontis
(M2) upper end connect；Second alternating current input power supplying (u b ) the breaker in middle group (M of one end and the first brachium pontis1) lower end connect, the
Two alternating current input power supplyings (u b ) the other end and the second inductance (L b ) one end connect, the second inductance (L b ) the other end and second
Breaker in middle group (the M of brachium pontis2) lower end connect；Upper switches set (the H of the first brachium pontis1) the upper switches set of upper end and the second brachium pontis
(H1) upper end, load (R) one end connect, load (R) the other end and the lower switches set (L of the first brachium pontis1) lower end,
Lower switches set (the L of two brachium pontis1) lower end, hold (n) connect.
The single-phase six switches set MMC rectifier of dual input the most according to claim 1, it is characterised in that: the of the first brachium pontis
Three inductance (L H1 ) and the 4th inductance (L L1 ) substituted by coupling inductance, the 3rd inductance of the second brachium pontis (L H2 ) and the 4th inductance (L L2 )
Substituted by coupling inductance.
The single-phase six switches set MMC rectifier of dual input the most according to claim 1, it is characterised in that: power switch unit
Including 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 )；Its
In, 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
(S 1 ) 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.
The single-phase six switches set MMC rectifier of dual input the most according to claim 1, it is characterised in that: each switches set
First outfan of+1 power switch unit of the second outfan and jth of jth power switch unit is connected, wherein the taking of j
Value is 1 ~ N-1.
The single-phase six switches set MMC rectifier of dual input the most according to claim 1, it is characterised in that: mode of operation includes
With frequency pattern and alien frequencies pattern, in same frequency pattern, the electric voltage frequency phase of the first alternating current input power supplying and the second alternating current input power supplying
With, voltage magnitude differs；In alien frequencies pattern, the first alternating current input power supplying and the electric voltage frequency of the second alternating current input power supplying and width
Value is the most different.
6. for the control method of the single-phase six switches set MMC rectifier of dual input described in claim 1, it is characterised in that: adopt
Opening and turning off with the switching tube of the phase-shifting carrier wave PWM each switches set of control；Upper switches set (the H of the first brachium pontis1) jth
Power switch unit (SMH1j), the lower switches set (L of the first brachium pontis1) jth power switch unit (SML1j), second brachium pontis
Upper switches set (H2) jth power switch unit (SMH2j) and the lower switches set (L of the second brachium pontis2) jth power switch list
Unit (SML2j) use identical triangular wave as jth carrier waveC j , wherein the value of j is 1 ~ N；N number of carrier wave (C 1 、C 2 、…、C N ) depend on
Secondary 360 °/N of lagging phase angle；Upper switches set (the H of the first brachium pontis1) use the primary sinusoidR a1 Superposition the first direct current biasingR doa Make
It it is the first modulating wave of the first brachium pontisR a1 +R doa , the lower switches set (L of the first brachium pontis1) use the second sine waveR b1 Superposition second is straight
Stream biasingR dob The second modulating wave as the first brachium pontisR b1 +R dob , the upper switches set (H of the second brachium pontis2) use the 3rd sine waveR a2 Superposition the first direct current biasingR doa The first modulating wave as the second brachium pontisR a2 +R doa , the lower switches set (L of the second brachium pontis2) adopt
Sinusoidal wave with the 4thR b2 Superposition the second direct current biasingR dob The second modulating wave as the second brachium pontisR b2 +R dob ；The primary sinusoidR a1
Sinusoidal wave with the 3rdR a2 Frequency identical and phase contrast is 180 °, second is sinusoidal waveR b1 Sinusoidal wave with the 4thR b2 Frequency identical
And phase contrast is 180 °.
Control method the most according to claim 6, it is characterised in that: the first modulating wave of the first brachium pontisR a1 +R doa With jth
Individual carrier waveC j Upper switches set (the H of the first brachium pontis is obtained by the first comparator1) jth power switch unit (SMH1j)
Two switching tubes (S 2 ) gate pole control level (S H1j ), when the first modulating wave of the first brachium pontisR a1 +R doa More than jth carrier waveC j
Time, the first comparator output high level, when the first modulating wave of the first brachium pontisR a1 +R doa Less than jth carrier waveC j Time, the first ratio
Relatively device output low level, wherein the value of j is 1 ~ N；Second modulating wave of the first brachium pontisR b1 +R dob With jth carrier waveC j By
Two comparators obtain the lower switches set (L of the first brachium pontis1) jth power switch unit (SML1j) second switch pipe (S 2 ) door
The control level of pole (S L1j ), when the second modulating wave of the first brachium pontisR b1 +R dob Less than jth carrier waveC j Time, the second comparator is defeated
Go out high level, when the second modulating wave of the first brachium pontisR b1 +R dob More than jth carrier waveC j Time, the second comparator output low level；
Upper switches set (the H of the first brachium pontis1) jth power switch unit (SMH1j) second switch pipe (S 2 ) control level of gate pole
(S H1j ) and the lower switches set (L of the first brachium pontis1) jth power switch unit (SML1j) second switch pipe (S 2 ) control of gate pole
Level processed (S L1j ) the breaker in middle group (M of the first brachium pontis is obtained by the first XOR gate1) jth power switch unit (SMM1j)
Middle second switch pipe (S 2 ) gate pole control level (S M1j )；First modulating wave of the second brachium pontisR a2 +R doa With jth carrier waveC j Logical
Cross the 3rd comparator and obtain the upper switches set (H of the second brachium pontis2) jth power switch unit (SMH2jSecond switch pipe in)
(S 2 ) gate pole control level (S H2j ), when the first modulating wave of the second brachium pontisR a2 +R doa More than jth carrier waveC j Time, the 3rd ratio
Relatively device output high level, when the first modulating wave of the second brachium pontisR a2 +R doa Less than jth carrier waveC j Time, the 3rd comparator output is low
Level；Second modulating wave of the second brachium pontisR b2 +R dob With jth carrier waveC j Obtain switching under the second brachium pontis by the 4th comparator
Group (L2) jth power switch unit (SML2j) second switch pipe (S 2 ) gate pole control level (S L2j ), when the second brachium pontis
The second modulating waveR b2 +R dob Less than jth carrier waveC j Time, the 4th comparator output high level, when the second tune of the second brachium pontis
Ripple processedR b2 +R dob More than jth carrier waveC j Time, the 4th comparator output low level；Upper switches set (the H of the second brachium pontis2) jth
Individual power switch unit (SMH2jSecond switch pipe in) (S 2 ) control level (S of gate poleH2j) and the second brachium pontis under switches set (L2)
Jth power switch unit (SML2j) second switch pipe (S 2 ) gate pole control level (S L2j ) obtained by the second XOR gate
Breaker in middle group (M to the second brachium pontis2) jth power switch unit (SMM2j) second switch pipe (S 2 ) gate pole control electricity
Flat (S M2j )；Second switch pipe in each power switch unit of each switches set (S 2 ) obtain after the control level of gate pole is anti-phase
First switching tube in this power switch unit (S 1 ) control level of gate pole.
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| CN201410042758.1A CN103762870B (en) | 2014-01-28 | 2014-01-28 | Double-input single-phase six-switch-block 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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| CN102055347A (en) * | 2010-07-22 | 2011-05-11 | 荣信电力电子股份有限公司 | Modular multilevel converter (MMC)-based transformer-free four-quadrant high-voltage variable frequency power supply topological structure |
| CN102664535A (en) * | 2012-04-10 | 2012-09-12 | 江苏力普电子科技有限公司 | Four-quadrant high-voltage variable-frequency speed regulating system topology based on MMC (modular multilevel converter) transformer without phase shift |
| CN102938560A (en) * | 2012-10-19 | 2013-02-20 | 浙江大学 | Direct-current converter station based on bipolar structure |
| CN203872074U (en) * | 2014-01-28 | 2014-10-08 | 华南理工大学 | Dual-input single-phase six-switch-group MMC rectifier |
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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 |
| JP5941631B2 (en) * | 2011-07-26 | 2016-06-29 | 株式会社日立製作所 | Power converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102055347A (en) * | 2010-07-22 | 2011-05-11 | 荣信电力电子股份有限公司 | Modular multilevel converter (MMC)-based transformer-free four-quadrant high-voltage variable frequency power supply topological structure |
| CN102664535A (en) * | 2012-04-10 | 2012-09-12 | 江苏力普电子科技有限公司 | Four-quadrant high-voltage variable-frequency speed regulating system topology based on MMC (modular multilevel converter) transformer without phase shift |
| CN102938560A (en) * | 2012-10-19 | 2013-02-20 | 浙江大学 | Direct-current converter station based on bipolar structure |
| CN203872074U (en) * | 2014-01-28 | 2014-10-08 | 华南理工大学 | Dual-input single-phase six-switch-group MMC rectifier |
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