CN105406728A - Full bidirectional switch mode two stage matrix converter rectification-level switch tube open circuit fault error-tolerance control method - Google Patents
Full bidirectional switch mode two stage matrix converter rectification-level switch tube open circuit fault error-tolerance control method Download PDFInfo
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- CN105406728A CN105406728A CN201510677292.7A CN201510677292A CN105406728A CN 105406728 A CN105406728 A CN 105406728A CN 201510677292 A CN201510677292 A CN 201510677292A CN 105406728 A CN105406728 A CN 105406728A
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Abstract
The invention discloses a full bidirectional switch mode two stage matrix converter rectification-level switch tube open circuit fault error-tolerance control method. The method is characterized in that, one or multiple rectification-level switch tubes of a full bidirectional switch mode two stage matrix converter is in open circuit fault, a driving signal of a bidirectional switch unit of the switch tube generating the local fault is firstly blocked, and a closing state is maintained; according to the fault type, a driving mode of the full bidirectional switch mode two stage matrix converter is adjusted, and integral error-tolerance operation is maintained. Through the error-tolerance control method, the full bidirectional switch mode two stage matrix converter can operate continuously when partial switch tubes are in circuit break faults, and thereby high-quality electrical energy is provided for a load.
Description
Technical field
The present invention relates to a kind of fault-tolerant Drive Control Technique of matrix converter, particularly relate to the Fault Tolerance Control Technology of a kind of full bidirectional switch type dual stage matrix converter when rectification stage generation switching tube open fault, belong to power electronic technology and control technology field.
Background technology
In recent years, based on matrix converter (matrixconverter, MC) concept development and come dual-level matrix frequency converter (twostagematrixconverter, TSMC), obtain the Chinese scholars extensively concern continued and research, there is the remarkable advantages such as compact conformation, switching loss is low, power density is high.TSMC has discrete rectification stage and inverse cascade structure, and compared with traditional MC, also have the change of current simple, rectification stage can realize the advantages such as zero current transition.
The two-stage type topological structure of TSMC has needs 12 switch elements altogether, and these switching devices can be made up of single-way switch or bidirectional switch.In existing Research Literature, unidirectional and the two-way pattern of switch tube has a variety of selection scheme: have and all to adopt single-way switch, this structure can provide sinusoidal output voltage and sinusoidal input current under certain condition, but when loading condition exceedes certain limit, this topology can not normally be run, and energy cannot two-way flow; Some inverse cascades adopt single-way switch pipe, and rectification stage adopts bidirectional switch pipe, and this topological structure can realize energy in bidirectional flow, output voltage and input current can keep sinusoidal, actual required switching tube quantity is 18, more moderate, is the scheme of current most study; If the rectification stage of TSMC and inverse cascade all adopt bidirectional switch, " full bidirectional switch type " dual stage matrix converter can be referred to as, actual needs 24 switching tubes, quantity is more, if it is constant to maintain the positive negative direction of DC bus-bar voltage, then inverse cascade adopts bidirectional switch just to seem unnecessary, and therefore this scheme is fresh receives publicity less and studies.
Along with the development of technology, the security performance of power electronic equipment more and more receives publicity, when the partial switch pipe in electrical energy transformer or other components and parts break down, maintain entire system continue operate with failure, become current study hotspot.And 6 switching tubes that full bidirectional switch type dual stage matrix converter has more than traditional structure, Hot Spare can be formed to whole system, when the single or multiple switching tubes of converter rectification stage or inverse cascade break down, play compensation, the continuation maintaining system runs.But because this topological structure is concerning normal operation demand, seem some " redundancy ", therefore not yet obtain due attention and research.The present invention is based on this topological structure, for the situation of rectification stage switching tube generation open fault, propose a kind of fault tolerant control method.
Summary of the invention
The object of the present invention is to provide fault tolerant control method during a kind of full bidirectional switch type dual stage matrix converter rectification stage switching tube open fault, based on the topological structure of full bidirectional switch type dual stage matrix converter, for the situation that rectification stage switching tube breaks down, adjusting the control mode of converter by rights, making total system continue to maintain the operation of total system when tolerating local fault.
For achieving the above object, the present invention is by the following technical solutions:
The main power circuit of full bidirectional switch type dual stage matrix converter is connected in sequence by rectification stage, DC bus and inverse cascade.Wherein, input three-phase a, b, c represent, export three-phase u, v, w and represent; The two poles of the earth of DC bus are designated as m pole and n pole respectively, and its positive negative direction can need to adjust according to actual motion; The three-phase bridge circuit that rectification stage is made up of 6 bidirectional switch unit, each bidirectional switch can adopt 2 IGBT of common emitter or common collector differential concatenation to form, rectification stage 6 bidirectional switch unit available symbols S
ji(i=a, b, c; J=m, n) represent, namely meaning connects the bidirectional switch unit of input i phase and direct current j pole; The three-phase bridge circuit that inverse cascade is also made up of 6 bidirectional switch unit, each bidirectional switch also can adopt 2 IGBT of common emitter or common collector differential concatenation to form, inverse cascade 12 single-way switch pipe available symbols S
ljk(j=m, n; L=u, v, w; K=1,2) represent, namely meaning connects direct current j pole and a kth unidirectional IGBT switching tube in the bidirectional switch unit of output l phase, and the numbering of IGBT consistent with " m pole → n pole " direction for " collector electrode → emitter-base bandgap grading " direction is set as k=1, and contrary is set as k=2.
Rectification stage is adopted to modulate without the double space-vector method of zero vector to matrix converter.When all switching tubes can normally work, the m of setting DC bus is positive pole, and n is negative pole, makes 6 switching tubes of inverse cascade numbering k=2 keep conducting state; The duty ratio that 6 switching tubes that rectification stage 6 switch elements and inverse cascade are numbered 1 calculate according to double space-vector method classical formulas is modulated.Owing to adopting rectification stage without the mode of zero vector, therefore, S
miand S
nihave in (i=a, b, c) and only have a duty ratio to be zero.
Fault tolerant control method during a kind of full bidirectional switch type dual stage matrix converter rectification stage switching tube open fault, when certain or multiple switching tube generation open fault of rectification stage, first the drive singal that the switching tube place bidirectional switch unit of local fault occurs is blocked, keep off state; Then, according to fault type, full bidirectional switch type dual stage matrix converter adjustable type of drive, maintains overall fault-tolerant operation.The present invention, mainly for following two kinds of fault types of rectification stage switching tube, proposes corresponding fault tolerant control method:
1) single bidirectional switch cell failure
Without loss of generality, if S
mathere is open fault and isolated by from circuit.In certain modulation period in running, if according to S during normal modulation mode
maduty ratio be zero, then continue to modulate full bidirectional switch type dual stage matrix converter according to normal mode; If according to S during normal modulation mode
maduty ratio be greater than zero, correspondence is S now
naduty ratio one be decided to be zero, then within this whole modulation period by DC bus-bar voltage set positive negative direction exchange, make up S
maopen fault.Rectification stage bidirectional switch cell S after adjustment
ma, S
mband S
mcduty ratio equal respectively to adjust front S
na, S
nband S
ncduty ratio, and adjustment after S
na, S
nband S
ncduty ratio equal to adjust front S
ma, S
mband S
mcduty ratio.Especially, S after adjustment
maduty ratio be zero, excised the modulation of output voltage and input current without impact.6 switching tubes with seasonal inverse cascade numbering k=1 switch to the state all opened, and 6 switching tubes of inverse cascade numbering k=2 carry out chopping modulation, S after adjustment
un2, S
vn2, S
wn2, S
um2, S
vm2and S
wm2duty ratio equal respectively to adjust front S
um1, S
vm1, S
wm1, S
un1, S
vn1and S
wn1duty ratio.
2) there are two bidirectional switch cell failures simultaneously, and are positioned at different input and are connected the position of DC bus not homopolarity
Without loss of generality, if S
maand S
nbthere is open fault and isolated by from circuit.Before each start time modulation period in running, need judge in advance: if according to normal modulation mode, these two rectification stage space vectors needed for cycle internal modulation process are the need of opening S
maor S
nb, according to judged result, three kinds of situations can be divided into:
2.1) in two rectification stage space vectors, S
maand S
nbdo not need open-minded
Continue to adopt normal modulation mode within this modulation period, namely setting m is positive pole, and n is negative pole, and 6 switching tubes of inverse cascade numbering k=2 keep conducting state; The duty ratio that 6 switching tubes that rectification stage 6 switch elements and inverse cascade are numbered 1 calculate according to double space-vector method classical formulas is modulated.
2.2) two rectification stage space vectors all need S
maor S
nbone of them or all open-minded
Obviously, S within this modulation period
maor S
nbduty ratio be greater than zero, corresponding S
naor S
mbduty ratio be zero.Within whole modulation period, exchange the polarity of DC bus m and n, namely setting m is negative pole, and n is positive pole.Rectification stage bidirectional switch cell S after adjustment
ma, S
mband S
mcduty ratio equal respectively to adjust front S
na, S
nband S
ncduty ratio, and adjustment after S
na, S
nband S
ncduty ratio equal to adjust front S
ma, S
mband S
mcduty ratio, especially, adjustment after S
maand S
nbduty ratio be zero, by their excisions on the modulation of output voltage and input current without impact; 6 switching tubes of inverse cascade numbering numbering k=1 switch to the state all opened, and 6 switching tubes of inverse cascade numbering k=2 carry out chopping modulation, S after adjustment
un2, S
vn2, S
wn2, S
um2, S
vm2and S
wm2duty ratio equal respectively to adjust front S
um1, S
vm1, S
wm1, S
un1, S
vn1and S
wn1duty ratio.
2.3) have and only have a rectification stage space vector to need S
maor S
nbone of them or all open-minded
Between the space vector active region of opening without the need to breakdown switch unit, still according to normal mode, rectification stage and inverse cascade are modulated; Within modulation period, rectification stage space vector exchanges the polarity of DC bus m and n while switching, thus in the space vector active region needing breakdown switch unit to open, according to m be negative pole, n is that the mode of positive pole is modulated rectification stage and inverse cascade.
Full bidirectional switch type dual stage matrix converter, under fault-tolerant operation mode, needs to switch back and forth between normal modulation mode and fault-tolerant modulation system, and safe and reliable handoff procedure is that fault-tolerant operation is successfully crucial.For this reason, the present invention proposes the switch step of following modulation system:
For ensureing the fail safe that modulation system switches, switch under the state being only zero vector at inverse cascade.For following situation: before switching, m is positive pole, and n is negative pole, rectification stage S
mband S
ncopen-minded, other switch elements turn off, and the switching tube of inverse cascade numbering k=2 is open-minded, S in the part of numbering k=1
um1, S
vm1, S
wm1open-minded, S
un1, S
vn1, S
wn1turn off; After switching, m is negative pole, and n is positive pole, rectification stage S
naand S
mcopen-minded, other switch elements turn off, and the switching tube of inverse cascade numbering k=1 is open-minded, S in the part of numbering k=2
un2, S
vn2, S
wn2open-minded, S
um2, S
vm2, S
wm2turn off.Handoff procedure is divided into following several step:
1) obtain the instantaneous of switching command, turn off S
mband S
nc;
2) postpone Δ t, treat S
mband S
ncclose completely and have no progeny, open S
un1, S
vn1, S
wn1.Now inverse cascade switching tube is all open-minded.
3) postpone Δ t again, turn off S
un2, S
vn2, S
wn2.Now inverse cascade is configured to a new zero vector, the zero vector equivalence before exchanging with DC bus both positive and negative polarity.
4) postpone Δ t again, wait for S
un2, S
vn2, S
wn2close completely and have no progeny, open S
naand S
mc.Obtain the rectification stage vector expected.
Wherein, Δ t is relevant with the switching characteristic of switching tube, can be identical with the switching dead that changer system sets.Other situations can be by that analogy.
The invention has the beneficial effects as follows:
1) make full bidirectional switch type dual stage matrix converter when rectification stage generation single tube fault or the two-tube fault of part by fault-tolerant modulation system, the bidirectional switch unit broken down can be isolated from circuit and continue to run, and total system runs without the need to derate, the waveform of output voltage and input current is unaffected, and maximum voltage transfer ratio does not also reduce.
2) by reasonable arrangement switch step, ensure that the safety and reliability mutually switched between normal modulation mode and fault-tolerant modulation system.
3) adopt fault tolerant control method of the present invention, improve the fault-tolerant operation ability of dual stage matrix converter, there is important practical application meaning.
Accompanying drawing explanation
Fig. 1 is the topological structure schematic diagram of full bidirectional switch type dual stage matrix converter, wherein, and (a) common emitter, (b) common collector;
Fig. 2 is the drive waveforms schematic diagram of rectification stage bidirectional switch unit and inverse cascade switching tube under normal modulation mode;
Fig. 3 is output voltage electric current under normal modulation mode, input voltage and input current and DC bus-bar voltage waveform;
Fig. 4 is after open fault occurs Sma, rectification stage bidirectional switch unit and inverse cascade switching tube drive waveforms schematic diagram;
Fig. 5 is after open fault occurs Sma and Snb, rectification stage bidirectional switch unit and inverse cascade switching tube drive waveforms schematic diagram;
Fig. 6 is after open fault occurs Sma, DC bus-bar voltage waveform under fault-tolerant operation mode;
Fig. 7 is after open fault occurs Sma and Snb, DC bus-bar voltage waveform under fault-tolerant operation mode;
Fig. 8 is when switching between normal modulation mode and fault-tolerant modulation system, the change schematic diagram of drive waveforms.
Embodiment
Be described below in detail embodiments of the present invention, the example of described execution mode is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the execution mode be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
(1) the topological structure introduction of full bidirectional switch type dual stage matrix converter
The main power circuit of full bidirectional switch type dual stage matrix converter is connected in sequence by rectification stage, DC bus and inverse cascade, as shown in Figure 1.Wherein, input three-phase a, b, c represent, export three-phase u, v, w and represent; The two poles of the earth of DC bus are designated as m pole and n pole respectively, and its positive negative direction can need to adjust according to actual motion; The three-phase bridge circuit that rectification stage is made up of 6 bidirectional switch unit, each bidirectional switch can adopt 2 IGBT of common emitter or common collector differential concatenation to form, rectification stage 6 bidirectional switch unit available symbols S
ji(i=a, b, c; J=m, n) represent, namely meaning connects the bidirectional switch unit of input i phase and direct current j pole; The three-phase bridge circuit that inverse cascade is also made up of 6 bidirectional switch unit, each bidirectional switch also can adopt 2 IGBT of common emitter or common collector differential concatenation to form, inverse cascade 6 bidirectional switch unit available symbols S
ljk(j=m, n; L=u, v, w; K=1,2) represent, namely meaning connects direct current j pole and a kth unidirectional IGBT switching tube in the bidirectional switch unit of output l phase, and the numbering of IGBT consistent with the-n extreme direction of m pole for collector electrode-emitter-base bandgap grading direction is set as k=1, and contrary is set as k=2.
(2) normal operating mode
Rectification stage is adopted to modulate without the double space-vector method of zero vector to matrix converter.When all switching tubes can normally work, the m of setting DC bus is positive pole, and n is negative pole, makes 6 switching tubes of inverse cascade numbering k=2 keep conducting state; The duty ratio that 6 switching tubes that rectification stage 6 switch elements and inverse cascade are numbered 1 calculate according to double space-vector method classical formulas is modulated.Owing to adopting rectification stage without the mode of zero vector, therefore in each modulation period, S
miand S
nihave in (i=a, b, c) and only have a duty ratio to be zero.
If incoming frequency and output frequency are 50Hz and 60Hz respectively, then under normal modulation mode, the rectification stage bidirectional switch unit of dual stage matrix converter and the drive waveforms of inverse cascade single-way switch pipe are as shown in Figure 2.As can be seen from the figure, rectification stage each bidirectional switch unit changes according to the rule of " normally closed → PWM copped wave → often open → PWM copped wave ", each phase drive waveforms mutual deviation 120 °, the switching tube of inverse cascade numbering k=2 is open-minded all the time, and the switching tube of numbering k=1 carries out PWM chopping modulation.Now, output voltage electric current, input voltage and input current and DC bus-bar voltage waveform are as shown in Figure 3.Wherein, load current is sinusoidal, and DC bus-bar voltage is just always, and presents the classical fan-shaped waveform of 6 pulse wave.
(3) fault-tolerant operation mode during single tube fault
Without loss of generality, if S
mathere is open fault and isolated by from circuit.In certain modulation period in running, if according to S during normal modulation mode
maduty ratio be zero, then continue to modulate full bidirectional switch type dual stage matrix converter according to normal mode; If according to S during normal modulation mode
maduty ratio be greater than zero, correspondence is S now
naduty ratio one be decided to be zero, then within this whole modulation period by DC bus-bar voltage set positive negative direction exchange, make up S
maopen fault.Rectification stage bidirectional switch cell S after adjustment
ma, S
mband S
mcduty ratio equal respectively to adjust front S
na, S
nband S
ncduty ratio, and adjustment after S
na, S
nband S
ncduty ratio equal to adjust front S
ma, S
mband S
mcduty ratio, especially, adjustment after S
maduty ratio be zero, excised the modulation of output voltage and input current without impact; 6 switching tubes with seasonal inverse cascade numbering k=1 switch to the state all opened, and 6 switching tubes of inverse cascade numbering k=2 carry out chopping modulation, S after adjustment
un2, S
vn2, S
wn2, S
um2, S
vm2and S
wm2duty ratio equal respectively to adjust front S
um1, S
vm1, S
wm1, S
un1, S
vn1and S
wn1duty ratio.
Fig. 4 gives S
maafter there is open fault, rectification stage bidirectional switch unit and inverse cascade switching tube drive waveforms.As can be seen from the figure, S
madrive singal remain off state, the corresponding adjustment of switching tube drive singal of other phases is to compensate S
maopen fault.Modulation system and the switching tube place of breaking down of two groups of switching tubes of inverse cascade numbering k=1 and numbering k=2 input input voltage and the u of phase
apolarity relevant: work as u
aduring >0, the switching tube normal open of numbering k=1, the switching tube of numbering k=2 carries out PWM; Work as u
aduring <0, the switching tube normal open of numbering k=2, the switching tube of numbering k=1 carries out PWM.Two kinds of modulation systems hocket along with the change in polarity of alternating voltage, and its duration is identical.Now, output voltage electric current, input voltage and input current be consistent under normal operating mode, DC bus-bar voltage waveform is as shown in Figure 6.As seen from the figure, DC bus half the time is negative voltage, and envelope is still in fan-shaped.
(4) fault-tolerant operation mode during two-tube fault
Without loss of generality, if S
maand S
nbthere is open fault and isolated by from circuit.Before each start time modulation period in running, need judge in advance: if according to normal modulation mode, these two rectification stage space vectors needed for cycle internal modulation process are the need of opening S
maor S
nb, according to judged result, three kinds of situations can be divided into:
1) in two rectification stage space vectors, S
maand S
nbdo not need open-minded
Continue to adopt normal modulation mode within this modulation period, namely setting m is positive pole, and n is negative pole, and 6 switching tubes of inverse cascade numbering k=2 keep conducting state; The duty ratio that 6 switching tubes that rectification stage 6 switch elements and inverse cascade are numbered 1 calculate according to double space-vector method classical formulas is modulated.
2) two rectification stage space vectors all need S
maor S
nb(one of them or all) is open-minded
Obviously, S within this modulation period
maand S
nbduty ratio be greater than zero, corresponding S
naor S
mbduty be zero.Within whole modulation period, exchange the polarity of DC bus m and n, namely setting m is negative pole, and n is positive pole.Rectification stage bidirectional switch cell S after adjustment
ma, S
mband S
mcduty ratio equal respectively to adjust front S
na, S
nband S
ncduty ratio, and adjustment after S
na, S
nband S
ncduty ratio equal to adjust front S
ma, S
mband S
mcduty ratio, especially, adjustment after S
maand S
nbduty ratio be zero, by their excisions on the modulation of output voltage and input current without impact; 6 switching tubes of inverse cascade numbering numbering k=1 switch to the state all opened, and 6 switching tubes of inverse cascade numbering k=2 carry out chopping modulation, S after adjustment
un2, S
vn2, S
wn2, S
um2, S
vm2and S
wm2duty ratio equal respectively to adjust front S
um1, S
vm1, S
wm1, S
un1, S
vn1and S
wn1duty ratio.
3) have and only have a rectification stage space vector to need S
maor S
nb(one of them or all) is open-minded
Between the space vector active region of opening without the need to breakdown switch unit, still according to normal mode, rectification stage and inverse cascade are modulated; Within modulation period, rectification stage space vector exchanges the polarity of DC bus m and n while switching, thus in the space vector active region needing breakdown switch unit to open, according to m be negative pole, n is that the mode of positive pole is modulated rectification stage and inverse cascade.
Fig. 5 gives S
maand S
nbafter there is open fault, adopt fault-tolerant operation mode, the drive waveforms of rectification stage bidirectional switch unit and inverse cascade switching tube simultaneously.As can be seen from the figure, S
maand S
nbdrive singal remain off state, the corresponding adjustment of switching tube drive singal of other phases is to compensate S
maopen fault.Two groups of switching tubes of inverse cascade numbering k=1 and numbering k=2 have three kinds of running statuses: one is the former PWM, and the latter is all open-minded, corresponding situation 1); A kind of for the former is all open-minded, the latter's PWM, corresponding situation 2); One is also had to be both PWM simultaneously, corresponding situation 3).Now, output voltage electric current, input voltage and input current with remain consistent under normal operating mode, DC bus-bar voltage waveform is then as shown in Figure 7.
(5) handoff procedure
Full bidirectional switch type dual stage matrix converter, under fault-tolerant operation mode, needs to switch back and forth between normal modulation mode and fault-tolerant modulation system, and safe and reliable handoff procedure is that fault-tolerant operation is successfully crucial.For this reason, the present invention proposes a kind of switch step of modulation system.
For ensureing the fail safe that modulation system switches, switch under the state being only zero vector at inverse cascade.For following situation: before switching, m is positive pole, and n is negative pole, rectification stage S
mband S
ncopen-minded, other switch elements turn off, and the switching tube of inverse cascade numbering k=2 is open-minded, S in the part of numbering k=1
um1, S
vm1, S
wm1open-minded, S
un1, S
vn1, S
wn1turn off; After switching, m is negative pole, and n is positive pole, rectification stage S
naand S
mcopen-minded, other switch elements turn off, and the switching tube of inverse cascade numbering k=1 is open-minded, S in the part of numbering k=2
un2, S
vn2, S
wn2open-minded, S
um2, S
vm2, S
wm2turn off.Handoff procedure as shown in Figure 8, is divided into following several step:
1) obtain the instantaneous of switching command, turn off S
mband S
nc;
2) postpone Δ t, treat S
mband S
ncclose completely and have no progeny, open S
un1, S
vn1, S
wn1.Now inverse cascade switching tube is all open-minded.
3) postpone Δ t again, turn off S
un2, S
vn2, S
wn2.Now inverse cascade is configured to a new zero vector, the zero vector equivalence before exchanging with DC bus both positive and negative polarity.
4) postpone Δ t again, wait for S
un2, S
vn2, S
wn2close completely and have no progeny, open S
naand S
mc.Obtain the rectification stage vector expected.
Wherein, Δ t is relevant with the switching characteristic of switching tube, can be identical with the switching dead that changer system sets.Other situations can be by that analogy.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. fault tolerant control method during a full bidirectional switch type dual stage matrix converter rectification stage switching tube open fault, it is characterized in that: when certain or multiple switching tube generation open fault of the rectification stage of full bidirectional switch type dual stage matrix converter, first the drive singal that the switching tube place bidirectional switch unit of local fault occurs is blocked, keep off state; Then, according to fault type, full bidirectional switch type dual stage matrix converter adjustment type of drive, maintains overall fault-tolerant operation.
2. fault tolerant control method during full bidirectional switch type dual stage matrix converter rectification stage switching tube open fault as claimed in claim 1, it is characterized in that: when in rectification stage circuit during single bidirectional switch cell S generation open fault, first the drive singal of this single bidirectional switch cell S is blocked, and single bidirectional switch cell S is isolated away from circuit, then make full bidirectional switch type dual stage matrix converter continue fault-tolerant operation in the following way:
Before in running, each modulation period starts, need judge in advance: in normal modulation mode, in this modulation period, whether the duty ratio of single bidirectional switch cell S is zero, if duty ratio is zero, then adopts normal modulation mode to converter; If duty ratio is non-vanishing, then exchange the positive-negative polarity at converter DC bus the two poles of the earth, act on each bidirectional switch unit after the duty ratio of the same brachium pontis of rectification stage two bidirectional switch unit under normal modulation pattern and drive singal being exchanged, the duty ratio of four single-way switch on the same brachium pontis of inverse cascade under normal modulation pattern and drive singal grouping are exchanged between two simultaneously.
3. fault tolerant control method during full bidirectional switch type dual stage matrix converter rectification stage switching tube open fault as claimed in claim 1, is characterized in that: when two bidirectional switch cell S in its rectification stage circuit
1and S
2there is open fault simultaneously, and these two bidirectional switch cell S
1and S
2when the input phase connected and DC bus polarity are all different, first block this two bidirectional switch cell S
1and S
2drive singal, and by these two bidirectional switch cell S
1and S
2isolate away from circuit, then make full bidirectional switch type dual stage matrix converter continue fault-tolerant operation in the following way:
Before in running, each modulation period starts, need judge in advance: in normal modulation mode, these two rectification stage space vectors needed for cycle internal modulation process are the need of opening this two bidirectional switch cell S
1and S
2,
1) in two rectification stage space vectors, these two bidirectional switch cell S
1and S
2do not need open-minded, then normal modulation mode is adopted to converter;
2), in two rectification stage space vectors, this two bidirectional switch cell S are all needed
1and S
2one of them or all open-minded, then exchange the positive-negative polarity at converter DC bus the two poles of the earth, act on each bidirectional switch unit after the duty ratio of the same brachium pontis of rectification stage two bidirectional switch unit under normal modulation pattern and drive singal being exchanged, the duty ratio of four single-way switch on the same brachium pontis of inverse cascade under normal modulation pattern and drive singal grouping are exchanged between two simultaneously;
3) have and only have a rectification stage space vector to need this two bidirectional switch cell S
1and S
2one of them or all open-minded, then between the space vector active region of opening without the need to breakdown switch unit, still according to normal mode, rectification stage and inverse cascade are modulated; Within modulation period, rectification stage space vector exchanges the polarity of DC bus m and n while switching, thus in the space vector active region needing breakdown switch unit to open, the mode of exchanging according to DC bus both positive and negative polarity is modulated rectification stage and inverse cascade.
4. fault tolerant control method during full bidirectional switch type dual stage matrix converter rectification stage switching tube open fault as described in as arbitrary in claim 1-3, it is characterized in that: when mutually switching between normal modulation mode and fault-tolerant operation control mode, realize handoff procedure in the following way:
If two bidirectional switch unit that rectification stage is in opening state before and after modulation system switches are respectively S
p1, S
n1and S
p2, S
n2, handoff procedure is divided into 4 steps:
1) obtain the instantaneous of switching command, turn off S
p1and S
n1;
2) postpone Δ t, wait for S
p1and S
n1close completely and have no progeny, open the switching tube that inverse cascade is not yet opened, all switching tubes of inverse cascade are all open-minded;
3) postpone Δ t again, turn off inverse cascade three switching tubes (which three switching tube concrete need need to select according to system), construct new zero vector;
4) postpone Δ t again, open S
p2and S
n2.
5. fault tolerant control method during bidirectional switch type dual stage matrix converter rectification stage switching tube open fault as claimed in claim 4 complete, is characterized in that: carry out switching normal modulation mode and fault-tolerant operation control mode under the state being only zero vector at inverse cascade.
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CN106505890A (en) * | 2016-12-06 | 2017-03-15 | 广州市科恩电脑有限公司 | A kind of airborne intelligent multichannel voltage power-supply system |
CN106505889A (en) * | 2016-12-06 | 2017-03-15 | 广州市科恩电脑有限公司 | A kind of airborne power supply plurality of voltages partial pressure method of supplying power to |
CN109975681A (en) * | 2019-04-04 | 2019-07-05 | 湘潭大学 | The two-way AC-DC matrix converter method for diagnosing faults of High Frequency Link |
CN112600437A (en) * | 2021-03-02 | 2021-04-02 | 四川华泰电气股份有限公司 | Double-active-bridge converter and open-circuit fault redundancy processing method thereof |
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CN112600437A (en) * | 2021-03-02 | 2021-04-02 | 四川华泰电气股份有限公司 | Double-active-bridge converter and open-circuit fault redundancy processing method thereof |
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