CN107681914A - Switching capacity T source inventers and modulator approach based on active clamp - Google Patents
Switching capacity T source inventers and modulator approach based on active clamp Download PDFInfo
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- CN107681914A CN107681914A CN201710929738.XA CN201710929738A CN107681914A CN 107681914 A CN107681914 A CN 107681914A CN 201710929738 A CN201710929738 A CN 201710929738A CN 107681914 A CN107681914 A CN 107681914A
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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
- H02M7/487—Neutral point clamped inverters
-
- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
- H02M7/53876—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output based on synthesising a desired voltage vector via the selection of appropriate fundamental voltage vectors, and corresponding dwelling times
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
Switching capacity T source inventers and modulator approach based on active clamp, are related to inverter technology field, in order to have larger resonance current, boost capability weak when solving the problems, such as interrupted existing Z-source inverter source current, startup.The negative pole connection coupling inductance L of dc source armature winding L11Negative pole, coupling inductance L armature windings L11Positive pole connects coupling inductance L secondary windings L simultaneously12Negative pole and insulated gate bipolar transistor S2Emitter stage, coupling inductance L secondary windings L12Cathode connecting diode D2Negative pole, diode D2Positive pole connection electric capacity C1Negative pole, electric capacity C1Positive pole simultaneously connect insulated gate bipolar transistor S2Colelctor electrode, diode D1Negative pole and insulated gate bipolar transistor S1Colelctor electrode, insulated gate bipolar transistor S1Emitter stage and diode D1Positive pole connect the positive pole of dc source simultaneously.The present invention is applied to inverter.
Description
Technical field
The present invention relates to inverter technology field, and in particular to switching capacity T source inventers and tune based on active clamp
Method processed.
Background technology
In recent years, new alternative energy source is sought in worldwide energy supply and demand contradiction, countries in the world.Cause
This, various green energy resources such as fuel cell, photovoltaic generation and wind-power electricity generation have obtained extensive development.But these new energy institutes
Caused electric energy can not direct feedback grid, and output voltage is unstable, is limited by compared with many condition, reduces its application
Scope.
Traditional inverter output voltage scope is restricted, and ac output voltage can only be less than DC bus-bar voltage.It is right
Some input direct voltages are not very stable occasions, such as fuel cell, solar cell or are existed DC voltage falls
Occasion, it has to increase one-level DC/DC booster circuits and DC voltage is increased to required size, which increase the complexity of system
Property and cost, while reduce the efficiency and reliability of system.
Z-source inverter can overcome some shortcomings of conventional inverter, and a kind of new change is proposed for power inverting technology
Parallel operation topological sum is theoretical.Fig. 1 provides the topological structure of voltage-type Z-source inverter, and Z-source inverter has some conventional inverter institutes
The advantages of not possessing, specifically can be summarized as it is following some：1) function of buck conversion can be realized；2) inverter and power supply it
Between Z source networks be present and can suppress through current, and can realize that use is done in twin-stage filtering；3) inverter leg can both lead directly to or can
With open circuit, therefore logical or mistake shut-off is opened by mistake as the switching tube caused by electromagnetic interference converter will not be caused to damage；4) inversion
Dead time or overlapping conducting time need not be added between the switching tube up and down of the same bridge arm of device, therefore output waveform does not have
Distortion.
But Z-source inverter is there is also weak point, such as：1) the input power electric current of Z-source inverter is to be in interrupted shape
State；2) the DC boosting factor is smaller, and must reduce modulation ratio when output voltage is higher should so as to increase the voltage of power device
Power.3) on startup, dc source forms path with Z sources electric capacity and anti-paralleled diode, produces larger resonance current, causes
Device failure.Due to above-mentioned deficiency, the application of Z-source inverter is restricted, therefore the source of resistance for studying higher performance is inverse
Become utensil to be of great significance.
The content of the invention
The invention aims to solve to have larger resonance electricity when interrupted existing Z-source inverter source current, startup
Stream, the problem of boost capability is weak, so as to provide switching capacity T source inventers and the modulator approach based on active clamp.
Switching capacity T source inventers of the present invention based on active clamp, including three-phase inverter 1 and output filter
Device 2；
The AC signal input of the AC signal output end connection output filter 2 of three-phase inverter 1, output filter
2 filtering signal output end output voltage is load supplying；
Also include the switching capacity T source networks 3 based on active clamp；
Switching capacity T source networks 3 based on active clamp include electric capacity C1, coupling inductance L, diode D1, diode D2、
Insulated gate bipolar transistor S1With insulated gate bipolar transistor S2；
The negative pole connection coupling inductance L of dc source armature winding L11Negative pole, coupling inductance L armature windings L11Positive pole
Connect coupling inductance L secondary windings L simultaneously12Negative pole and insulated gate bipolar transistor S2Emitter stage, L level of coupling inductance around
Group L12Cathode connecting diode D2Negative pole, diode D2Positive pole connection electric capacity C1Negative pole, electric capacity C1Positive pole connect simultaneously
Insulated gate bipolar transistor S2Colelctor electrode, diode D1Negative pole and insulated gate bipolar transistor S1Colelctor electrode, insulation
Grid bipolar transistor S1Emitter stage and diode D1Positive pole connect the positive pole of dc source simultaneously；
Dc source, insulated gate bipolar transistor S1With diode D1Common port connection three-phase inverter 1 positive pole it is defeated
Enter end；
Diode D2With electric capacity C1Common port connection three-phase inverter 1 negative input.
Preferably, there are two kinds of working conditions, respectively pass-through state and non-pass-through state；
When 1 upper and lower bridge arm direct pass of three-phase inverter, while the insulation in the switching capacity T source networks 3 based on active clamp
Grid bipolar transistor S2It is open-minded, insulated gate bipolar transistor S1Shut-off, referred to as pass-through state, now based on active clamp
Switching capacity T source networks 3 disconnect with three-phase inverter 1, armature winding L of the dc source to coupling inductance L11Charging；
When three-phase inverter 1 is in normal operating conditions, insulated gate bipolar transistor S2Shut-off, insulated gate bipolar are brilliant
Body pipe S1It is open-minded, it is non-pass-through state；
Under non-pass-through state, if dc source, coupling inductance L and electric capacity C1Power to the load simultaneously, referred to as non-pincers
Position state；If dc source and coupling inductance L discontinuous currents, electric capacity C1In clamping state, independently power to the load, claim
For clamping state.
Preferably, the sensitizing factor B of the switching capacity T source inventers based on active clampZFor：
Wherein, n is coupling inductance L armature winding and the turn ratio of secondary windings, and D is to lead directly to dutycycle, D2For clamper week
Phase ratio.
Preferably, the voltage gain G of the switching capacity T source inventers based on active clamp is：
M is modulation factor in formula.
Preferably, coupling inductance L primary winding inductances value L11For：
Wherein, VdcFor direct current power source voltage, TsFor switch periods, P is given power output.
The modulator approach of the switching capacity T source inventers based on active clamp of the present invention, sweared based on 6 effective voltages
Amount, 2 Zero voltage vectors and 3 straight-through vectors are realized；
6 effective voltage vectors differ 60 ° successively, divide the space into six sectors, lead directly to vector zero vector voltage
It is zero, the origin in sector；The reference vector of output is by two neighboring effective voltage vector, Zero voltage vector and leads directly to
Vector modulation.
Beneficial effects of the present invention：The present invention passes through auxiliary switch S first2With electric capacity C1Realize switching capacity function, phase
Than existing T source inventers, boost capability is considerably increased, then, passes through auxiliary switch S1With electric capacity C1Cooperation realizes three-phase
The active clamp of the input voltage of inverter 1, and can further increase boost capability and reduction by changing clamper cycle ratio
Inductance value, therefore reduce loss, cost and volume.Source current is continuous, has larger resonance current in the absence of when starting
Problem.
The modulator approach of the present invention, utilizes auxiliary switch S1、S2Realize active clamp and switching capacity function, and with T sources
The performance of network in itself is combined, and further improves boost capability, it is suppressed that starting current, adds the reliability of circuit.
Brief description of the drawings
Fig. 1 is the topology diagram of existing Z-source inverter in background technology；
Fig. 2 is the topology diagram of the switching capacity T source inventers of the present invention based on active clamp；
Fig. 3 is Fig. 2 in pass-through state, the equivalent circuit diagram of the switching capacity T source networks based on active clamp；
Fig. 4 be Fig. 2 under non-pass-through state, switching capacity T source network of the non-clamping state based on active clamp it is equivalent
Circuit diagram；
Fig. 5 be Fig. 2 under non-pass-through state, the equivalent electric of switching capacity T source network of the clamping state based on active clamp
Lu Tu；
Fig. 6 is Fig. 2 switching capacity T source inventer space vector of voltage distribution maps based on active clamp；
Fig. 7 is the reference vector synthesis of Fig. 2 switching capacity T source inventer space vector of voltage based on active clamp
Figure；
Fig. 8 is the SVPWM controlling switch views of the present invention；
Fig. 9 be emulation in the clamper cycle compare D2When=0, three-phase inverter input voltage ViFigure；
Figure 10 be emulation in the clamper cycle compare D2Under=0, electric capacity C1Voltage pattern；
Figure 11 be emulation in the clamper cycle compare D2Under=0, three-phase inverter output voltage UabFigure；
Figure 12 be emulation in the clamper cycle compare D2Under=0, output current phase figure；
Figure 13 be emulation in the clamper cycle compare D2Under=0, electric power outputting current figure；
Figure 14 be emulation in the clamper cycle compare D2Under=0.2, three-phase inverter input voltage ViFigure；
Figure 15 be emulation in the clamper cycle compare D2Under=0.2, electric capacity C1Voltage pattern；
Figure 16 be emulation in the clamper cycle compare D2Under=0.2, output line voltage VabFigure；
Figure 17 be emulation in the clamper cycle compare D2Under=0.2, output current phase figure；
Figure 18 be emulation in the clamper cycle compare D2Under=0.2, electric power outputting current figure.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but not as limiting to the invention.
As shown in Fig. 2 the switching capacity T source inventers based on active clamp, including three-phase inverter 1 and output filter
2；
The AC signal input of the AC signal output end connection output filter 2 of three-phase inverter 1, output filter
2 filtering signal output end output voltage is load supplying；
Also include the switching capacity T source networks 3 based on active clamp；
Switching capacity T source networks 3 based on active clamp include electric capacity C1, coupling inductance L, diode D1, diode D2、
Insulated gate bipolar transistor S1With insulated gate bipolar transistor S2；
The negative pole connection coupling inductance L of dc source armature winding L11Negative pole, coupling inductance L primary level windings L11Just
Pole connects coupling inductance L secondary windings L simultaneously12Negative pole and insulated gate bipolar transistor S2Emitter stage, L level of coupling inductance
Winding L12Cathode connecting diode D2Negative pole, diode D2Positive pole connection electric capacity C1Negative pole, electric capacity C1Positive pole connect simultaneously
Meet insulated gate bipolar transistor S2Colelctor electrode, diode D1Negative pole and insulated gate bipolar transistor S1Colelctor electrode, absolutely
Edge grid bipolar transistor S1Emitter stage and diode D1Positive pole connect the positive pole of dc source simultaneously；
Dc source, insulated gate bipolar transistor S1With diode D1Common port connection three-phase inverter 1 positive pole it is defeated
Enter end；
Diode D2With electric capacity C1Common port connection three-phase inverter 1 negative input.
Present embodiment is improved for existing Z-source inverter, passes through auxiliary switch S first2With electric capacity C1Realize out
Capacitive function is closed, compared to existing T source inventers, boost capability is considerably increased, then, passes through auxiliary switch S1With electric capacity
C1Coordinating realizes the active clamp of the input voltage of three-phase inverter 1, and can further be increased by changing clamper cycle ratio
Big boost capability and reduction inductance value and loss.Its operation principle is：By 1 upper and lower bridge arm direct pass of three-phase inverter, at the same it is open-minded
Insulated gate bipolar transistor S in switching capacity T source networks 3 based on active clamp2, turn off insulated gate bipolar transistor
S1, now the switching capacity T source networks 3 based on active clamp disconnected with three-phase inverter 1, referred to as pass-through state, now
Dc source charges to coupling inductance L first winding, and now equivalent circuit diagram is as shown in Figure 3.When three-phase inverter 1 is in normal
Working condition, shut-off insulated gate bipolar transistor S2, open insulated gate bipolar transistor S1, now based on active clamp
Switching capacity T source networks 3 provide energy by three-phase inverter 1 for load, referred to as non-pass-through state；Under non-pass-through state,
If dc source, coupling inductance and electric capacity C1Power to the load simultaneously, be non-clamping state, its equivalent circuit diagram such as Fig. 4, such as
Fruit dc source and coupling inductance discontinuous current, electric capacity C1In clamping state, independently power to the load, its equivalent circuit diagram is such as
Fig. 5.
It is set in a switch periods TsIn, the pass-through state duration is T0, it is D=T to lead directly to dutycycle0/Ts, then by
Equivalent circuit Fig. 3 of pass-through state is obtained：
VL11ON=Vdc+VC1,VL12ON=nVL11ON,Vi=0 (formula 1)
VL11ONFor coupling inductance armature winding both end voltage, V under pass-through stateL12ONFor coupling inductance under pass-through state time
Level winding both end voltage, VC1For electric capacity C1The voltage at both ends, VdcIt is what the switching capacity T source networks 3 based on active clamp inputted
Direct current power source voltage, ViFor the input terminal voltage of three-phase inverter 1；
It is set in a switch periods TsIn, non-pass-through state, the non-clamping state duration is T1, dutycycle D1=
T1/Ts, the clamping state duration is T2, clamper cycle ratio is D2=T2/Ts, obtained by equivalent circuit Fig. 4：
Vdc-VL11NO-VL12NO=VC1,VL12NO=nVL11NO,Vi=VC1(formula 2)
Obtained by equivalent circuit Fig. 5：
VL11NO=VL12NO=0, Vi=VC1(formula 3)
VL11NOFor under non-pass-through state, coupling inductance armature winding both end voltage, VL12NOUnder non-pass-through state, to couple
Inductance secondary windings both end voltage, n are the primary turn ratio with secondary windings of coupling inductance；
According to a switch periods TsIn, under stable state coupling inductance armature winding both ends average voltage be 0, by formula (1),
(2) obtained with (3)：
T0VL11ON+T1VL11NO=0 (formula 4)
So as to the input voltage V of three-phase inverter 1iThe direct current inputted with the switching capacity T source networks 3 based on active clamp
Source voltage VdcRelation is as follows：
The then sensitizing factor B of the switching capacity T source inventers based on active clampZIt is expressed as：
The clamper cycle is bigger than bigger sensitizing factor it can be seen from formula 6, the clamper cycle than selection mainly according to liter
Pressure ratio, straight-through time distribution and power output calculate.
Then the voltage gain G of the switching capacity T source inventers based on active clamp is expressed as：
M is modulation factor in formula.
Armature winding has under shoot through state：
L in formula11For coupling inductance L primary winding inductance values, iL11(t) it is pass-through state induction charging current instantaneous value,
iL11-maxFor pass-through state inductance maximum current；
Have under non-pass-through state：
Vdc-VL11NO-VL12NO=Vi=BZVdc(formula 9)
Assuming that when charging and discharging currents phase, can be obtained by formula formula 9 and formula 10：
According to pass-through state and non-pass-through state coupling inductance working condition, can be obtained according to magnetic potential balance principle：
N1iL11-max=(N1+N2)iL12-max(formula 12)
iL12-maxFor non-pass-through state coupling inductance secondary windings maximum current, N1、N2For coupling inductance primary and secondary winding turns
Number；Therefore average current input is：
Output power of power supply is：
Ideally, power output is equal to input power, therefore coupling inductance primary winding inductance value is:
In the case that output power of power supply, straight-through time, direct current power source voltage, sensitizing factor determine, public affairs are substituted into
The downslope time that formula 11 is calculated, the fall time is less than cycle time with straight-through time sum, and clamping operation is
Cycle time and fall time and the difference of straight-through time, D is compared according to the clamper cycle2, it is straight-through than the D and power output P of power supply
Coupling inductance value can be calculated according to formula 15.
Export reference vector UrefWith effective voltage vector Uu、UvAnd Zero voltage vector U00With straight-through vector U0Relation represents
For：
T in formulauFor the start vector output time of place sector, TvFor the termination vector output time of place sector, T0For
Straight-through vector output time；T00For Zero voltage vector output time,
Due to Zero voltage vector U00With straight-through vector U0Output voltage is zero, therefore reference vector is expressed as：
Uref=duUu+dvUv
In present embodiment, the modulator approach of the switching capacity T source inventers based on active clamp, 6 effectively electricity are shared
Press vector (U0,U60,U120,U180,U240,U300), 2 Zero voltage vector (U000And U111) and 3 straight-through vector (U7,U8,U9),
In order to realize the modulator approach by the switch S in the switching capacity T source networks 3 based on active clamp1And S2Carried out with other vectors
Coordinate, its on off sequence is as shown in table 1, wherein 6 effective voltage vectors differ 60 ° successively, direction is fixed, and is divided the space into
Six sectors, as shown in fig. 6,3 straight-through vectors are 1 three pairs of bridge arms of three-phase inverter leads directly to generation respectively, reference vector passes through
Two neighboring effective voltage vector Uu、Uv, Zero voltage vector U00Synthesis and straight-through vector U0Synthesis, due to leading directly to vector U0With
Zero vector U00Voltage is zero, so at the origin of space vector figure, the dutycycle difference of two of which effective voltage vector
It is duAnd dv, the dutycycle of zero vector is d00, it is D to lead directly to vector duty cycle, and Vector modulation figure is as shown in Figure 7.
The on off sequence of table 1
Because the inverter output line voltage based on space vector modulating method is equal to inverter input direct voltage, therefore
Output line voltage and the peak value of phase voltage are：
Vab=Vac=Vbc=VdcG
V in formulaab,Vbc,VacIt is three-phase output line voltage peak value, Va,Vb,VcIt is three-phase output phase voltage peak value.
Due to spatial modulation strategy in the maximum reference vector of linear adjustment region output and Equivalent DC voltage in the presence of as follows
Relation：
Due to Zero voltage vector (U000And U111) and straight-through vector (U7,U8,U9) output voltage is zero, therefore export reference
Vector representation is：
Uref=duUu+dvUv
U in formulauIt is start vector, if being U in the first sector vector0, the second sector is U60, the 3rd sector is U120, the
The four sectors vector is U180, the 5th sector is U240, the 6th sector is U300, UvIt is to terminate vector, if in the first sector vector
For U60, the second sector is U120, the 3rd sector is U180, the 4th sector vector is U240, the 5th sector is U300, the 6th sector is
U0。
Wherein du、dvTake up space and compare for the vector output under respective sectors, be expressed as：
θiFor in the initial angle of the i-th sector,
The modulation strategy of switching capacity T source inventers of the invention based on active clamp is on the basis of traditional Z-source inverter
It is upper to use insulated gate bipolar transistor S2To realize switching capacity function, insulated gate bipolar transistor S is used1To realize active pincers
Bit function, it is as follows that its operation principle is described according to Fig. 8：t1Moment, voltage vector enter zero vector U00State, now VT1, VT2,
VT3 is open-minded, VT4, VT5, VT6 shut-off, igbt S1Open, S2Shut-off, in electric capacity C1Stand alone as load supplying,
Realize active clamp, t2Moment turns off S1Prevent that entering pass-through state causes electric capacity C1It is short-circuited, t2Moment, into pass-through state,
And igbt S is opened simultaneously2, shut-off S1, electric capacity C1Charged with dc source to coupling inductance L, in t4Moment,
Turn off igbt S2, circuit turns again to Zero voltage vector state, electric capacity C1Afterflow is provided to coupling inductance L to return
Road, t5Moment opens igbt S1Start to export normal vector U110, t6Moment output vector U100, dc source,
Coupling inductance and electric capacity C1Common is load supplying, and inverter enters recurrent state afterwards.
The angular interval of output vector each time is determined with carrier frequency according to the electric voltage frequency that three-phase inverter 1 exports
Degree, by remembering to output angle, sector is carried out by the memory angle and judges to calculate with initial angle, it is straight according to what is obtained
When logical time, modulation degree and initial angle are to be calculated the output of each vector of synthesized reference voltage vector under respective sectors
Between, then S will be switched by software and hardware combining1、S2Execution logic be introduced into control system, realize the vector modulation method.
In order to verify the correctness of the switching capacity T source inventers proposed by the invention based on active clamp and feasible
Property, simulating, verifying is carried out to the invention.Dc source parameter is arranged to 60V in main circuit in emulation；Filtering parameter is exported to set
For：Lf=1.5mH, Cf=4.7uF；Switching frequency 10kHz；Modulation factor M=0.9, lead directly to dutycycle D=0.1；For based on
Electric capacity in the switching capacity T source networks of active clamp is 1000uf；Coupling inductance turn ratio n=2, clamper cycle compare D2When=0,
Select as L11=0.12mH, L12=0.48mH；The clamper cycle compares D2When=0.2, coupling inductance selection is L11=0.07mH, L12
=0.28mH；Load is per the Ω of phase 30.The clamper cycle compares D2=0 time simulation waveform such as Fig. 9 to Figure 13, clamper cycle compare D2Under=0.2
Simulation waveform is as shown in Figure 14 to Figure 18.
From emulation, using space vector modulating method, the switching capacity T source networks based on active clamp are introduced significantly
Ground improves boost capability, reduces voltage stress, while can be seen that active clamp function can further improve boosting energy
Power, and the clamper cycle is stronger than bigger boost capability.The inductance value needed simultaneously is smaller, therefore reduces volume and loss
Electricity, advantage existing for new topology, has reached the purpose of design by simulating, verifying.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
Claims (6)
1. the switching capacity T source inventers based on active clamp, including three-phase inverter (1) and output filter (2)；
The AC signal input of the AC signal output end connection output filter (2) of three-phase inverter (1), output filter
(2) filtering signal output end output voltage is load supplying；
Characterized in that, also include the switching capacity T source networks (3) based on active clamp；
Switching capacity T source networks (3) based on active clamp include electric capacity C1, coupling inductance L, diode D1, diode D2, absolutely
Edge grid bipolar transistor S1With insulated gate bipolar transistor S2；
The negative pole connection coupling inductance L of dc source armature winding L11Negative pole, coupling inductance L armature windings L11Positive pole connects simultaneously
Meet coupling inductance L secondary windings L12Negative pole and insulated gate bipolar transistor S2Emitter stage, coupling inductance L secondary windings L12Just
Pole connection diode D2Negative pole, diode D2Positive pole connection electric capacity C1Negative pole, electric capacity C1Positive pole simultaneously connect insulated gate
Bipolar transistor S2Colelctor electrode, diode D1Negative pole and insulated gate bipolar transistor S1Colelctor electrode, insulated gate bipolar
Transistor npn npn S1Emitter stage and diode D1Positive pole connect the positive pole of dc source simultaneously；
Dc source, insulated gate bipolar transistor S1With diode D1Common port connection three-phase inverter (1) positive pole input
End；
Diode D2With electric capacity C1Common port connection three-phase inverter (1) negative input.
2. the switching capacity T source inventers according to claim 1 based on active clamp, it is characterised in that have two kinds of works
Make state, respectively pass-through state and non-pass-through state；
When three-phase inverter (1) upper and lower bridge arm direct pass, while the insulation in the switching capacity T source networks (3) based on active clamp
Grid bipolar transistor S2It is open-minded, insulated gate bipolar transistor S1Shut-off, referred to as pass-through state, now based on active clamp
Switching capacity T source networks (3) disconnect with three-phase inverter (1), armature winding L of the dc source to coupling inductance L11Fill
Electricity；
When three-phase inverter (1) is in normal operating conditions, insulated gate bipolar transistor S2Shut-off, insulated gate bipolar crystal
Pipe S1It is open-minded, it is non-pass-through state；
Under non-pass-through state, if dc source, coupling inductance L and electric capacity C1Power to the load simultaneously, referred to as non-clamper shape
State；If dc source and coupling inductance L discontinuous currents, electric capacity C1In clamping state, independently power to the load, referred to as clamp
Position state.
3. the switching capacity T source inventers according to claim 1 based on active clamp, it is characterised in that based on active
The sensitizing factor B of the switching capacity T source inventers of clamperZFor：
Wherein, n is coupling inductance L armature winding and the turn ratio of secondary windings, and D is to lead directly to dutycycle, D2For clamper cycle ratio.
4. the switching capacity T source inventers according to claim 3 based on active clamp, it is characterised in that based on active
The voltage gain G of the switching capacity T source inventers of clamper is：
<mrow>
<mi>G</mi>
<mo>=</mo>
<msub>
<mi>B</mi>
<mi>Z</mi>
</msub>
<mi>M</mi>
<mo>=</mo>
<msub>
<mi>B</mi>
<mi>Z</mi>
</msub>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<mi>D</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mo>=</mo>
<mfrac>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<mi>D</mi>
<mo>)</mo>
<mo>(</mo>
<mn>1</mn>
<mo>+</mo>
<mi>n</mi>
<mi>D</mi>
<mo>-</mo>
<msub>
<mi>D</mi>
<mn>2</mn>
</msub>
<mo>)</mo>
</mrow>
<mrow>
<mn>1</mn>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>+</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mi>D</mi>
<mo>-</mo>
<msub>
<mi>D</mi>
<mn>2</mn>
</msub>
</mrow>
</mfrac>
</mrow>
M is modulation factor in formula.
5. the switching capacity T source inventers according to claim 1 based on active clamp, it is characterised in that coupling inductance L
Primary winding inductance value L11For：
Wherein, VdcFor direct current power source voltage, TsFor switch periods, P is output power of power supply, and n is coupling inductance L armature winding
With the turn ratio of secondary windings, D is to lead directly to dutycycle, D2For clamper cycle ratio.
6. the modulator approach of the switching capacity T source inventers based on active clamp, it is characterised in that sweared based on 6 effective voltages
Amount, 2 Zero voltage vectors and 3 straight-through vectors are realized；
6 effective voltage vectors differ 60 ° successively, divide the space into six sectors, and straight-through vector zero vector voltage is
Zero, the origin in sector；The reference vector of output passes through two neighboring effective voltage vector, Zero voltage vector and straight-through vector
Synthesis.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861576A (en) * | 2019-04-16 | 2019-06-07 | 哈尔滨工业大学 | A kind of Z-source inverter allowing work in discontinuous conduct mode |
| CN111130374A (en) * | 2019-12-12 | 2020-05-08 | 东北电力大学 | T source inverter with low direct-current link voltage spike |
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| CN102594191A (en) * | 2012-02-24 | 2012-07-18 | 西安交通大学 | Active clamping three-level zero-voltage soft-switching converter using coupled inductor |
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