CN104158420B - Control method and system of three-phase three-level converter - Google Patents
Control method and system of three-phase three-level converter Download PDFInfo
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- CN104158420B CN104158420B CN201410425056.1A CN201410425056A CN104158420B CN 104158420 B CN104158420 B CN 104158420B CN 201410425056 A CN201410425056 A CN 201410425056A CN 104158420 B CN104158420 B CN 104158420B
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Abstract
The invention discloses a control method and system of a three-phase three-level converter. The control method comprises the steps of comparing input modulated waves with standard triangular carrier waves and outputting a PWM driving signal; adding dead time into the PWM driving signal and generating a first PWM signal and a second PWM signal which are complementary, wherein the first PWM signal and the second PWM signal are used for driving complementary switching tubes of the three-phase three-level converter; according to the comparison value of the modulated waves and the standard triangular carrier waves, the limit value of the dead time and the limit value of the minimum safety pulse width, judging whether breakover narrow pulses exist in the first PWM signal or the second PWM signal; if yes, eliminating the breakover narrow pulses by setting the comparison value. The control method and system are easy to implement.
Description
Technical field
The present invention relates to current transformer control technology field, in particular, it is related to a kind of control of three-phase tri-level current transformer
Method processed and control system.
Background technology
It is low that three-phase tri-level converter system has a voltage stress, the low advantage of output harmonic wave, can obtain higher defeated
Go out voltage, be widely used the new energy such as solar energy and wind energy field.
With reference to Fig. 1, Fig. 1 is the circuit diagram of the single-phase brachium pontis of three-phase tri-level converter system, and described single-phase brachium pontis includes: opens
Close pipe s1, switching tube s2, switching tube s3And switching tube s4.Wherein, each switching tube is igbt power tube.Switching tube s1With switching tube
s3For complementary switch pipe, switching tube s2With switching tube s4For complementary switch pipe.Three-phase tri-level converter system include three single-phase
Brachium pontis, totally six pairs of complementary switch pipes.
When being driven to three-phase tri-level converter system controlling, the burst pulse in control signal is impact three-phase three
One main cause of the Performance And Reliability of level current transformer system.When burst pulse is less than the minimum safe pulsewidth of switching device
When, referred to as turn on burst pulse, now device can not normally be opened or turn off so that system reliability reduces.Turn on when existing
During burst pulse, on the one hand can lead to control signal cannot in main circuit accomplished so that output waveform distortion；The opposing party
Face, can increase switch and consume, and lead to system heat generation to increase, reduce system effectiveness.
Prior art when driving three-phase tri-level converter system, in order to eliminate the conducting burst pulse of control signal, one
Planting implementation method is to reselect different control vectors by the difference of the index of modulation, and then when redistributing the effect of vector
Between, to suppress to turn on burst pulse.But for three-phase tri-level converter system, because it controls vector a lot, this realization side
Formula amount of calculation is larger, and implementation method is complicated.
Content of the invention
For solving the above problems, the invention provides a kind of control method of three-phase tri-level current transformer and control system,
Can eliminate to conducting burst pulse during three-phase tri-level current transformer drive control, implementation method is simple.
For achieving the above object, the following technical scheme of present invention offer:
A kind of control method of three-phase tri-level current transformer, this control method includes:
The modulating wave of input is compared with standard triangular carrier, exports pwm drive signal；
Add Dead Time in described pwm drive signal, generate a complementary pwm signal and the 2nd pwm signal,
A described pwm signal is used for described 2nd pwm signal driving the switching tube of the complementation of described kind of three-phase tri-level current transformer；
According to the fiducial value of described modulating wave and described standard triangular carrier, the limit value of described Dead Time and minimum
The limit value of safe pulsewidth, judges to whether there is conducting burst pulse in a described pwm signal or described 2nd pwm signal；
When there is conducting burst pulse in a described pwm signal or described 2nd pwm signal, by arranging described comparison
Value eliminates described conducting burst pulse.
Preferably, in above-mentioned control method, described addition Dead Time in described pwm drive signal, generate complementary
A pwm signal and the 2nd pwm signal include:
Negate saltus step after Dead Time described in described pwm drive signal rise edge delay, under described pwm drive signal
Fall directly negates saltus step along not time delay, generates a described pwm signal；
Do not change in described pwm drive signal rising edge, when dead band described in described pwm drive signal trailing edge time delay
Between, generate described 2nd pwm signal.
Preferably, in above-mentioned control method, described fiducial value according to described modulating wave and described standard triangular carrier,
The limit value of described Dead Time and the limit value of minimum safe pulsewidth, judge a described pwm signal or described 2nd pwm
Whether there is conducting burst pulse in signal to include:
For the counting manner of comparison rising after falling before, obtain described modulating wave with described standard triangular wave in described mark
The first fiducial value during the last transition of quasi- triangular wave, second in described standard triangular carrier continuous first transition therewith
Fiducial value；
For first rising the counting manner of comparison declining afterwards, obtain described modulating wave with described standard triangular wave in described mark
The first fiducial value during the first transition of quasi- triangular wave, second when described standard triangular carrier continuous last transition therewith
Fiducial value；
For the counting manner of comparison rising after falling before, when described first fiducial value is subtracted with described second fiducial value sum
Go described Dead Time limit value be less than described three-phase tri-level current transformer minimum safe pulsewidth limit value when, described the
Form conducting burst pulse in one pwm signal；
For first rising the counting manner of comparison declining afterwards, deduct institute again when the counting cycle 2 of described standard triangular carrier
State the first fiducial value, described second fiducial value and the difference of limit value three's sum of described Dead Time and be less than described three-phase three
During the limit value of level current transformer minimum safe pulsewidth, form conducting burst pulse in described 2nd pwm signal.
Preferably, in above-mentioned control method, described is to increase by arrange described fiducial value eliminating described conducting burst pulse
Described greatly the first fiducial value is with described second fiducial value sum so that the width of described conducting burst pulse is more than described minimum safe
Pulsewidth.
Preferably, in above-mentioned control method, described is to subtract by arrange described fiducial value eliminating described conducting burst pulse
Little described first fiducial value and described second fiducial value sum are so that the width of described conducting burst pulse is zero.
Present invention also offers a kind of control system of three-phase tri-level current transformer, this control system includes:
Drive signal output unit, described drive signal output unit is used for the modulating wave of input and standard triangular carrier
Relatively, export pwm drive signal；
Complementary signal output unit, described complementary signal output unit is used for adding dead band in described pwm drive signal
Time, generate a complementary pwm signal and the 2nd pwm signal, a described pwm signal is used with described 2nd pwm signal
Switching tube in the complementation driving described kind of three-phase tri-level current transformer；
Judging unit, described judging unit is used for fiducial value according to described modulating wave and described standard triangular carrier, institute
State the limit value of Dead Time and the limit value of minimum safe pulsewidth, judge a described pwm signal or described 2nd pwm letter
Whether there is conducting burst pulse in number；
Conducting burst pulse eliminates unit, and described conducting burst pulse eliminates unit and is used for when a described pwm signal or described
When there is conducting burst pulse in the 2nd pwm signal, eliminate described conducting burst pulse by arranging described fiducial value.
Preferably, in above-mentioned control system, described complementary signal output unit includes:
First pwm signal output unit, a described pwm signal output unit is used for rising in described pwm drive signal
Along postponing to negate saltus step after described Dead Time, directly negate saltus step in described pwm drive signal trailing edge not time delay, generate institute
State a pwm signal；
2nd pwm signal output unit, described 2nd pwm signal output unit is used for rising in described pwm drive signal
Along not changing, in Dead Time described in described pwm drive signal trailing edge time delay, generate described 2nd pwm signal.
Preferably, in above-mentioned control system, described judging unit includes:
First acquisition unit, for the counting manner of comparison rising after falling before, described first acquisition unit is used for obtaining
Described modulating wave and the first fiducial value when the last transition of described standard triangular wave for the described standard triangular wave, in described standard
Triangular carrier therewith continuous first transition when the second fiducial value；
Second acquisition unit, for first rising the counting manner of comparison declining afterwards, described second acquisition unit is used for obtaining
Described modulating wave and the first fiducial value in the first transition of described standard triangular wave for the described standard triangular wave, in described standard
Triangular carrier therewith continuous last transition when the second fiducial value；
First judging unit, for the counting manner of comparison rising after falling before, described first judging unit is used for working as institute
State the first fiducial value and deduct the limit value of described Dead Time less than described three-phase tri-level change with described second fiducial value sum
During the limit value of stream device minimum safe pulsewidth, form conducting burst pulse in a described pwm signal；
Second judging unit, for first rising the counting manner of comparison declining afterwards, described second judging unit is used for working as institute
The counting cycle 2 stating standard triangular carrier deducts described first fiducial value, described second fiducial value and described Dead Time again
When the difference of limit value three's sum is less than the limit value of described three-phase tri-level current transformer minimum safe pulsewidth, described second
Form conducting burst pulse in pwm signal.
Preferably, in above-mentioned control system, it is conducting burst pulse broadening unit that described conducting burst pulse eliminates unit；
Described conducting burst pulse broadening unit be used for increasing described first fiducial value with described second fiducial value sum so that
The width of described conducting burst pulse is more than or equal to described minimum safe pulsewidth.
Preferably, in above-mentioned control system, it is conducting burst pulse zero unit that described conducting burst pulse eliminates unit；
Described conducting burst pulse zero unit be used for reducing described first fiducial value with described second fiducial value sum so that
The width of described conducting burst pulse is zero.
By foregoing description, the control method of the three-phase tri-level current transformer described in technical solution of the present invention includes:
The modulating wave of input is compared with standard triangular carrier, exports pwm drive signal；Dead band is added in described pwm drive signal
Time, generate a complementary pwm signal and the 2nd pwm signal, a described pwm signal is used with described 2nd pwm signal
Switching tube in the complementation driving described kind of three-phase tri-level current transformer；According to described modulating wave and described standard triangular carrier
The limit value of fiducial value, the limit value of described Dead Time and minimum safe pulsewidth, judges a described pwm signal or described
Whether there is conducting burst pulse in 2nd pwm signal；Turn on when existing in a described pwm signal or described 2nd pwm signal
During burst pulse, eliminate described conducting burst pulse by arranging described fiducial value.Described control method passes through setting with control system
The mode of described fiducial value eliminates described conducting burst pulse, eliminates conducting with respect to the mode again changing control vector narrow
The control mode of pulse, implementation method is simpler.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing providing obtains other accompanying drawings.
Fig. 1 is the circuit diagram of the single-phase brachium pontis of three-phase tri-level converter system；
A kind of schematic flow sheet of the control method of three-phase tri-level current transformer that Fig. 2 provides for the embodiment of the present application；
A kind of generation principle schematic of pwm drive signal that Fig. 3 provides for the embodiment of the present application；
Fig. 4 provides a kind of oscillogram of pwm drive signal dead band configuration for the embodiment of the present application；
Bear during a kind of phase inverted carrier that Fig. 5 provides for the embodiment of the present application at negative semiaxis when semiaxis process and positive carrier wave
The waveform diagram of reason；
Fig. 6 and Fig. 7 is the formation basic theory schematic diagram of conducting burst pulse when fiducial value is less twice；
Fig. 8 and Fig. 9 is the formation basic theory schematic diagram of conducting burst pulse when fiducial value is larger twice.
Specific 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 description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
As described in background, for three-phase tri-level current transformer, because it controls vector a lot, then this realization side
Formula amount of calculation is larger, and implementation method is complicated.
When three-phase tri-level current transformer being driven control by pwm control technology, need modulating wave and the mark setting
Quasi wave is compared, and to generate pwm drive signal, pwm drive signal is carried out with dead band configuration, adds Dead Time, Ke Yisheng
Become two complementary pwm signals, this two complementary pwm signals can be used for driving two complementations of three-phase tri-level current transformer
Switching tube.
Inventor's research finds, when by pwm signal to drive control three-phase tri-level current transformer, conducting burst pulse
Pulsewidth and described modulating wave and the fiducial value of described standard triangular carrier and related with described Dead Time, in Dead Time one
Regularly, can reach, by arranging described fiducial value, the purpose eliminating conducting burst pulse.
Based on the studies above, the embodiment of the present application provides a kind of control method of three-phase tri-level current transformer, with reference to figure
A kind of schematic flow sheet of the control method of 2, Fig. 2 three-phase tri-level current transformers providing for the embodiment of the present application, described control
Method includes:
Step s11: the modulating wave of input is compared with standard triangular carrier, exports pwm drive signal.
Control method described in the embodiment of the present application is using pwm control method, described three-phase tri-level current transformer to be driven
Dynamic control.When forming described pwm drive signal, according to pwm control method, the triangular wave of the modulating wave of setting and standard is entered
Row compares, you can form pwm drive signal.
With reference to Fig. 3, a kind of generation principle schematic of pwm drive signal that Fig. 3 provides for the embodiment of the present application, wherein uc
It is u for amplitudecTriangular carrier, usIt is u for amplitudesInstantaneous value in switch periods for the modulating wave.Work as ucLess than usWhen, pwm
Drive signal is low level, works as ucMore than usWhen, pwm drive signal is high level.General modulating wave is sine wave or saddle type ripple
Deng,
Step s12: add Dead Time in described pwm drive signal, generate a complementary pwm signal and second
Pwm signal, a described pwm signal and described 2nd pwm signal are used for driving the complementation of described kind of three-phase tri-level current transformer
Switching tube.
For three-phase tri-level current transformer, there are three brachium pontis in parallel, each brachium pontis has two to complementary switching tube,
Totally six to complementary switching tube.Therefore in order to realize, to six drive controls to complementary switching tube, in step s11, can adopting
With three level carrier pwm control methods, controlled by dsp (digital signal processor, digital signal processor)
Output three-phase modulations ripple.It is six to complementary pwm signal to described three-phase modulations Wave Decomposition by step s12, this is six to complementation
Pwm signal be used for the complementary switching tube of six couples of drive control three-phase tri-level current transformer.
Step s13: according to the limit value of the fiducial value of described modulating wave and described standard triangular carrier, described Dead Time
And the limit value of minimum safe pulsewidth, judge narrow with the presence or absence of conducting in a described pwm signal or described 2nd pwm signal
Pulse.
Step s14: when there is conducting burst pulse in a described pwm signal or described 2nd pwm signal, by setting
Described fiducial value eliminates described conducting burst pulse.
Described control method can eliminate described conducting burst pulse by way of arranging described fiducial value, with respect to
Again change the control mode controlling the mode of vector to eliminate conducting burst pulse, implementation method is simpler.
The implementation of described step 12 refers to Fig. 4, and Fig. 4 provides a kind of pwm drive signal dead for the embodiment of the present application
The oscillogram of area's configuration.The u of (a) figure in Fig. 4sU less than (b) figures, described step s12 includes:
Negate saltus step after Dead Time described in described pwm drive signal rise edge delay, under described pwm drive signal
Fall directly negates saltus step along not time delay, generates a described pwm signal pwm1.
Modulating wave and described standard triangular carrier are reference as described above, in described standard triangular carrier rising edge, when
ucLess than or equal to usWhen, a described pwm signal pwm1 is high level, works as ucMore than usWhen, a described pwm signal pwm1 prolongs
When for high level setting time (insertion Dead Time) afterwards saltus step be low level.In described triangular carrier trailing edge, work as ucLess than us
When, a described pwm signal pwm1 not time delay, direct saltus step is high level.
Modulating wave and described standard triangular carrier are reference as described above, in described standard triangular carrier rising edge, when
ucLess than or equal to usWhen, described 2nd pwm signal pwm2 is low level, works as ucMore than usWhen, described 2nd pwm signal pwm2
The direct saltus step of not time delay is high level.In described triangular carrier trailing edge, work as ucLess than usWhen, described 2nd pwm signal pwm2 prolongs
When for high level setting time (insertion Dead Time) afterwards saltus step be low level.
From Fig. 4 (a) and Fig. 4 (b), the duty of described pwm drive signal can be changed by adjusting described modulating wave
Than, and then change the dutycycle of a described pwm signal pwm1 and described 2nd pwm signal pwm2.By a described pwm letter
Number pwm1 and described 2nd pwm signal pwm2 can be driven to the complementary switch pipe in described three-phase tri-level current transformer controlling
System.
, including two groups of complementary opening taking the one of single-phase brachium pontis of the three-phase tri-level current transformer shown in Fig. 1 as a example
Guan Guan, needs two modulating waves, and a phase modulating wave is decomposed into the modulation of two optimizations by three level carrier pwm control technologies
Ripple, the complementary switching tube of two groups of drive control.Mode is as follows:
Due to not supporting carrier wave to be negative situation in dsp bottom software, so, need the tune to negative half period during carrier modulation
Ripple processed processes.Phase inverted carrier for negative half period is controlled by spwm, and negative half period modulating wave is negated, then negate rear negative half period
Modulation is identical with positive half cycle modulation.With reference to Fig. 5 (a), the modulating wave of two optimizations is respectively us1、us2；Drive control s1Pipe and s3
The modulating wave of pipe is us1, it is the positive axis of modulating wave in [0, π], [π, 2 π] are 0；Drive control s2Pipe and s4The modulating wave of pipe is
us2, it is 0 in [0, π], [π, 2 π] are that the negative half period of modulating wave negates.By modulating wave us1And us2Two can be generated to complementation
Pwm signal drive control Fig. 1 in two groups of complementary switching tubes.In positive half cycle, the s of complementation1Pipe and s3Pipe is modulated, s2Pipe
Clamped down on as conducting state, s4Manage as off state,When, export positive voltage,When, export 0 level；Negative
Half cycle, the s of complementation2Pipe and s4Pipe is modulated, s3Pipe is clamped down on as conducting state, s1Manage as off state, whenWhen,
Output negative voltage,When, export 0 level.
Homophase carrier wave spwm is controlled, using being added with periodic quantity to negative half period modulating wave in software, then upwards (just partly
Week) translation after negative half period modulation with positive half cycle modulation contrary.The modulating wave of two optimizations is respectively us1、us2；Drive control s1Pipe
And s3The modulating wave of pipe is us1, it is the positive axis of modulating wave in [0, π], [π, 2 π] are 0；Drive control s2Pipe and s4The modulation of pipe
Ripple is us2, it is the triangular carrier cycle value in [0, π], [π, 2 π] are added with periodic quantity for negative half period modulating wave.By modulating wave us1
And us2Two can be generated to two groups in complementary pwm signal drive control Fig. 1 complementary switching tubes.In positive half cycle, complementation
s1Pipe and s3Pipe is modulated, s2Pipe is clamped down on as conducting state, s4Manage as off state,When, export positive voltage,When, export 0 level；In negative half period, the s of complementation2Pipe and s4Pipe is modulated, s3Pipe is clamped down on as conducting state, s1
Manage as off state, whenWhen, export negative voltage,When, export 0 level.Shown in concrete condition such as Fig. 5 (b).
Configured by above-mentioned dead band and three level carrier pwm control technologies are driven to three-phase tri-level current transformer controlling
When processed, the formation basic theory of conducting burst pulse is as follows:
Dsp using continuous add drop count mode carry out pwm occur when, triangular carrier count rising edge and count
Trailing edge carries out the comparison of a fiducial value respectively.For comparand register value loading mode be typically chosen count value be zero or
Equal to during periodic quantity heavy duty, that is, current control period calculate dutyfactor value, next controlling cycle be used as actual compare deposit
The value of device.
Under continuous add drop count mode, turn on the two kinds of producing methods that have of burst pulse, a kind of generation is in timing ga(u)ge
Number device falls before rear first transition section.Another kind of generation last transition section after timer conter first rises；Set Dead Time
Limit value be deadtime, in front and back the fiducial value of calculating twice be respectively cmpr_last and cmpr_next, timer counter
The periodic quantity of device is period, and dsp system frequency is f_systerm.
Under conditions of rising counting after falling before, comparand register value sum twice is less than Dead Time in front and back
During limit value deadtime, due to the inserted mode of Dead Time, the pwm1 of formation does not occur level to change, is illustrated in fig. 6 shown below.
When comparand register value sum (cmpr_last+cmpr_next) twice is slightly larger than the limit value of Dead Time
When, the pwm1 of formation produces conducting burst pulse, and the pulse width of described conduction pulses is opened less than described three-phase tri-level current transformer
Close the minimum safe pulsewidth of pipe, the time width of described conduction pulses is: (cmpr_last+cmpr_next-deadtime)/f_
Systerm, as shown in Figure 7.
For under conditions of first rising and rising counting afterwards, relatively depositing twice before and after 2 times of timer period values deduct
When the difference of device value sum is less than the limit value of Dead Time, due to the inserted mode of Dead Time, the pwm2 of formation does not occur
Level changes, as shown in Figure 8.
Before and after 2 times of timer period values deduct, the difference of comparand register value sum twice is slightly larger than Dead Time
During limit value, the pwm2 of formation produces conducting burst pulse, and the time width of pulse is: (2*period-cmpr_last-cmpr_
Next-deadtime)/f_systerm, as shown in Figure 9.
Described by above-mentioned conducting burst pulse formation basic theory, step 2 includes:
For the counting manner of comparison rising after falling before, obtain described modulating wave with described standard triangular wave in described mark
The first fiducial value during the last transition of quasi- triangular wave, second in described standard triangular carrier continuous first transition therewith
Fiducial value；
For first rising the counting manner of comparison declining afterwards, obtain described modulating wave with described standard triangular wave in described mark
The first fiducial value during the first transition of quasi- triangular wave, second when described standard triangular carrier continuous last transition therewith
Fiducial value；
For the counting manner of comparison rising after falling before, when described first fiducial value is subtracted with described second fiducial value sum
Go described Dead Time limit value be less than or equal to described three-phase tri-level current transformer minimum safe pulsewidth limit value when, in institute
State and in a pwm signal, form conducting burst pulse；
For first rising the counting manner of comparison declining afterwards, deduct institute again when the counting cycle 2 of described standard triangular carrier
State the first fiducial value, described second fiducial value and the difference of limit value three's sum of described Dead Time and be less than described three-phase three
During the limit value of level current transformer minimum safe pulsewidth, form conducting burst pulse in described 2nd pwm signal.
Described by the formation basic theory and determination methods of above-mentioned conducting burst pulse, in order to prevent turning on burst pulse
Occur, the value being sent to comparand register is needed to limit according to certain algorithm, reached conducting burst pulse and eliminated
Purpose, the dutycycle cmpr value for same complementary drive signals judges, to suppress to turn on the appearance of burst pulse.If
The limit value value determining minimum safe pulsewidth is pulsemin, if conducting burst pulse really will be eliminated:
1. to ensure: when trailing edge is with rising edge, cmpr_last and cmpr_next sum is less than twice in front and back
Deadtime, or cmpr_last and cmpr_next sum are more than deadtime+pulsemin.
When trailing edge, cmpr_last is less than deadtime+pulsemin, conducting burst pulse processes home position 1, table
The cmpr_next of a bright following rising edge will be analyzed processing:
1), when, cmpr_last+cmpr_next is less than deadtime, do not processed；
2), when, cmpr_last+cmpr_next is more than deadtime+pulsemin, do not processed；
3), during deadtime≤cmpr_last+cmpr_next≤deadtime+pulsemin, judge cmpr_last such as
Fruit is less than pulsemin, by assignment cmpr_next=0, if cmpr_last is more than or equal to pulsemin, by cmpr_next
=deadtime+pulsemin-cmpr_last.
2. to ensure: in rising edge and trailing edge, cmpr_last and cmpr_next sum are less than 2* twice in front and back
Period-deadtime pulsemin, or cmpr_last and cmpr_next sum are more than 2*period-deadtime.
When rising edge, cmpr_last is more than period-deadtime-pulsemin, conducting burst pulse processes mark
Position 1, shows that the cmpr_next of a following trailing edge will be analyzed processing:
1), when, 2*period-cmpr_last-cmpr_next is less than deadtime, do not processed.
2), when, 2*period-cmpr_last-cmpr_next is more than deadtime+pulsemin, do not processed.
3), during deadtime≤2*period-cmpr_last-cmpr_next≤deadtime+pulsemin, judge
Cmpr_last if greater than period-pulsemin, by assignment cmpr_next=period, if cmpr_last be less than etc.
In period-pulsemin, by cmpr_next=2*period-deadtime-pulsemin-cmpr_last.
By foregoing description, by arranging described fiducial value described in step s14 in control method described in the present embodiment
Eliminating described conducting burst pulse can be for increasing described first fiducial value with described second fiducial value sum so that described conducting is narrow
The width of pulse is more than or equal to described minimum safe pulsewidth.Or, institute can be eliminated for described by arranging described fiducial value
Stating conducting burst pulse is to reduce described first fiducial value and described second fiducial value sum so that the width of described conducting burst pulse
It is zero.
After a certain phase brachium pontis drive signal being carried out turn on burst pulse suppression using described control method, believed by driving
Number oscillogram, and conducting burst pulse suppression after experiment and simulation comparison oscillogram understand, conducting burst pulse effect suppression
Effectively.
Described in the present embodiment, control method is configured by dead band, and the pwm drive signal that a modulating wave is generated is decomposed into
Two complementary pwm signals, for driving two complementary switching tubes in same brachium pontis.At this point it is possible to according to described modulating wave
With the limit value of the fiducial value, the limit value of described Dead Time and minimum safe pulsewidth of standard triangular carrier, judge described
Whether there is conducting burst pulse in two pwm signals, further, eliminate the narrow arteries and veins of described conducting by arranging described fiducial value
Punching is it is ensured that the reliability of three-phase tri-level current transformer.
Based on above-mentioned control method embodiment, another embodiment of the application additionally provides a kind of three-phase tri-level current transformer
Control system, described control system includes: drive signal output unit, complementary signal output unit, judging unit and conducting
Burst pulse eliminates unit.
Described for drive signal output unit, the modulating wave of input is compared with standard triangular carrier, output pwm drive
Signal.
Described complementary signal output unit is used for adding Dead Time in described pwm drive signal, generates complementary the
One pwm signal and the 2nd pwm signal, a described pwm signal and described 2nd pwm signal are used for driving described kind of three-phase three
The switching tube of the complementation of level current transformer.
Described judging unit is used for fiducial value according to described modulating wave and standard triangular carrier, the limit of described Dead Time
Definite value and the limit value of minimum safe pulsewidth, judge to whether there is in a described pwm signal or described 2nd pwm signal and lead
Logical burst pulse.
Described conducting burst pulse eliminates unit and is used for leading when existing in a described pwm signal or described 2nd pwm signal
During logical burst pulse, eliminate described conducting burst pulse by arranging described fiducial value.
Wherein, described complementary signal output unit includes: a pwm signal output unit, a described pwm signal output
Unit is used for negating saltus step after Dead Time described in described pwm drive signal rise edge delay, under described pwm drive signal
Fall directly negates saltus step along not time delay, generates a described pwm signal；2nd pwm signal output unit, described 2nd pwm letter
Number output unit is used for not changing in described pwm drive signal rising edge, dead described in described pwm drive signal trailing edge time delay
Area's time, generate described 2nd pwm signal.
Described judging unit includes:
First acquisition unit, for the counting manner of comparison rising after falling before, described first acquisition unit is used for obtaining
Described modulating wave and the first fiducial value when the last transition of described standard triangular wave for the described standard triangular wave, in described standard
Triangular carrier therewith continuous first transition when the second fiducial value；
Second acquisition unit, for first rising the counting manner of comparison declining afterwards, described second acquisition unit is used for obtaining
Described modulating wave and the first fiducial value in the first transition of described standard triangular wave for the described standard triangular wave, in described standard
Triangular carrier therewith continuous last transition when the second fiducial value；
First judging unit, for the counting manner of comparison rising after falling before, described first judging unit is used for working as institute
State the first fiducial value and deduct the limit value of described Dead Time less than described three-phase tri-level change with described second fiducial value sum
During the limit value of stream device minimum safe pulsewidth, form conducting burst pulse in a described pwm signal；
Second judging unit, for first rising the counting manner of comparison declining afterwards, described second judging unit is used for working as institute
The counting cycle 2 stating standard triangular carrier deducts described first fiducial value, described second fiducial value and described Dead Time again
When the difference of limit value three's sum is less than the limit value of described three-phase tri-level current transformer minimum safe pulsewidth, described second
Form conducting burst pulse in pwm signal.
In order to eliminate conducting burst pulse, it can be conducting burst pulse broadening unit that described conducting burst pulse eliminates unit；Institute
State conducting burst pulse broadening unit to be used for increasing described first fiducial value with described second fiducial value sum so that described conducting is narrow
The width of pulse is more than or equal to described minimum safe pulsewidth.
In order to eliminate conducting burst pulse, it can also be conducting burst pulse zero unit that described conducting burst pulse eliminates unit；
Described conducting burst pulse zero unit is used for reducing described first fiducial value with described second fiducial value sum so that described conducting
The width of burst pulse is zero.
It should be noted that control system described in the present embodiment is based on control method described in above-described embodiment, identical similar
Part can be complementary to one another explanation.
Described control system can eliminate conducting burst pulse when three-phase tri-level current transformer drives, and implementation is simple.
By above-mentioned discussion, control method and control system described in the embodiment of the present application, controlled based on carrier wave pwm
Technology, dsp is controlled the three-phase modulations ripple of output, is decomposed into the modulating wave of 6 optimizations, controls 6 groups of three-phase system complementary respectively
Igbt power tube, in conjunction with the dead band function of key control unit dsp, respectively the corresponding feeding of modulating waves of 6 optimizations is compared
The value of depositor carries out turning on burst pulse elimination algorithm and limits, and the conducting burst pulse of three-level current transformer is pressed according to its size will
Ask and filtered or broadening, efficiently solve the problems, such as system conducting burst pulse, substantially increase the reliability of system, technical scheme
Simply, practical, do not limited by use condition, suitable engineer applied, and be easily generalized to the current transformer of more high level number and control
In, algorithm rationally, does not affect normal pwm modulation simultaneously.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple modifications to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and be to fit to and principles disclosed herein and features of novelty phase one
The scope the widest causing.
Claims (8)
1. a kind of control method of three-phase tri-level current transformer is it is characterised in that include:
The modulating wave of input is compared with standard triangular carrier, exports pwm drive signal；
Add Dead Time in described pwm drive signal, generate a complementary pwm signal and the 2nd pwm signal, described
First pwm signal is used for described 2nd pwm signal driving the switching tube of the complementation of described three-phase tri-level current transformer；
According to the fiducial value of described modulating wave and described standard triangular carrier, the limit value of described Dead Time and minimum safe
The limit value of pulsewidth, judges to whether there is conducting burst pulse in a described pwm signal or described 2nd pwm signal；
When there is conducting burst pulse in a described pwm signal or described 2nd pwm signal, disappeared by arranging described fiducial value
Except described conducting burst pulse；
Wherein, described fiducial value according to described modulating wave and described standard triangular carrier, described Dead Time limit value with
And the limit value of minimum safe pulsewidth, judge in a described pwm signal or described 2nd pwm signal, to whether there is the narrow arteries and veins of conducting
Punching includes:
For the counting manner of comparison rising after falling before, obtain described modulating wave with described standard triangular carrier in described standard
The first fiducial value during the last transition of triangular carrier, in the continuous rising area with this last transition of described standard triangular carrier
Between when the second fiducial value；
For first rising the counting manner of comparison declining afterwards, obtain described modulating wave with described standard triangular carrier in described standard
The first fiducial value during the first transition of triangular carrier, continuously declines area in described standard triangular carrier and this first transition
Between when the second fiducial value；
For the counting manner of comparison rising after falling before, when described first fiducial value and described second fiducial value sum deduct institute
State Dead Time limit value be less than described three-phase tri-level current transformer minimum safe pulsewidth limit value when, described first
Form conducting burst pulse in pwm signal；
For first rising the counting manner of comparison declining afterwards, deduct described again when the counting cycle 2 of described standard triangular carrier
One fiducial value, described second fiducial value are less than described three-phase tri-level with the difference of limit value three's sum of described Dead Time
During the limit value of current transformer minimum safe pulsewidth, form conducting burst pulse in described 2nd pwm signal.
2. control method according to claim 1 is it is characterised in that described add dead band in described pwm drive signal
Time, generate a complementary pwm signal and the 2nd pwm signal include:
Negate saltus step after Dead Time described in described pwm drive signal rise edge delay, in described pwm drive signal trailing edge
Not time delay directly negates saltus step, generates a described pwm signal；
Do not change in described pwm drive signal rising edge, in Dead Time described in described pwm drive signal trailing edge time delay, raw
Become described 2nd pwm signal.
3. control method according to claim 1 is it is characterised in that lead described in the described described fiducial value elimination by setting
Logical burst pulse is to increase described first fiducial value with described second fiducial value sum so that the width of described conducting burst pulse is more than
Or it is equal to described minimum safe pulsewidth.
4. control method according to claim 1 is it is characterised in that lead described in the described described fiducial value elimination by setting
Logical burst pulse is to reduce described first fiducial value with described second fiducial value sum so that the width of described conducting burst pulse is
Zero.
5. a kind of control system of three-phase tri-level current transformer is it is characterised in that include:
Drive signal output unit, described drive signal output unit is used for the modulating wave of input and standard triangular carrier ratio
Relatively, export pwm drive signal；
Complementary signal output unit, described complementary signal output unit is used for adding Dead Time in described pwm drive signal,
Generate a complementary pwm signal and the 2nd pwm signal, a described pwm signal and described 2nd pwm signal are used for driving
The switching tube of the complementation of described kind of three-phase tri-level current transformer；
Judging unit, described judging unit is used for fiducial value according to described modulating wave and described standard triangular carrier, described dead
The limit value of area's time and the limit value of minimum safe pulsewidth, judge in a described pwm signal or described 2nd pwm signal
With the presence or absence of conducting burst pulse；
Conducting burst pulse eliminates unit, and described conducting burst pulse eliminates unit and is used for when a described pwm signal or described second
When there is conducting burst pulse in pwm signal, eliminate described conducting burst pulse by arranging described fiducial value；
Wherein, described judging unit includes:
First acquisition unit, for the counting manner of comparison rising after falling before, described first acquisition unit is used for obtaining described
Modulating wave and the first fiducial value when the last transition of described standard triangular carrier for the described standard triangular carrier, in described standard
Second fiducial value with this last transition during continuous first transition of triangular carrier；
Second acquisition unit, for first rising the counting manner of comparison declining afterwards, described second acquisition unit is used for obtaining described
Modulating wave and the first fiducial value in the first transition of described standard triangular carrier for the described standard triangular carrier, in described standard
Second fiducial value with this first transition during continuous last transition of triangular carrier；
First judging unit, for the counting manner of comparison rising after falling before, described first judging unit is used for when described the
The limit value that one fiducial value and described second fiducial value sum deduct described Dead Time is less than described three-phase tri-level current transformer
During the limit value of minimum safe pulsewidth, form conducting burst pulse in a described pwm signal；
Second judging unit, for first rising the counting manner of comparison declining afterwards, described second judging unit is used for when described mark
The counting cycle 2 of quasi- triangular carrier deducts the restriction of described first fiducial value, described second fiducial value and described Dead Time again
When the difference of value three's sum is less than the limit value of described three-phase tri-level current transformer minimum safe pulsewidth, in described 2nd pwm
Form conducting burst pulse in signal.
6. control system according to claim 5 is it is characterised in that described complementary signal output unit includes:
First pwm signal output unit, a described pwm signal output unit is used for prolonging in described pwm drive signal rising edge
Negate saltus step after described Dead Time late, directly negate saltus step in described pwm drive signal trailing edge not time delay, generate described the
One pwm signal；
2nd pwm signal output unit, described 2nd pwm signal output unit is used in described pwm drive signal rising edge not
Change, in Dead Time described in described pwm drive signal trailing edge time delay, generate described 2nd pwm signal.
7. control system according to claim 5 is it is characterised in that it is to turn on narrow arteries and veins that described conducting burst pulse eliminates unit
Rush broadening unit；
Described conducting burst pulse broadening unit is used for increasing described first fiducial value with described second fiducial value sum so that described
The width of conducting burst pulse is more than or equal to described minimum safe pulsewidth.
8. control system according to claim 5 is it is characterised in that it is to turn on narrow arteries and veins that described conducting burst pulse eliminates unit
Punching zero unit；
Described conducting burst pulse zero unit is used for reducing described first fiducial value with described second fiducial value sum so that described
The width of conducting burst pulse is zero.
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| CN113037072B (en) * | 2021-05-28 | 2021-08-17 | 天津飞旋科技股份有限公司 | Narrow pulse suppression method and device and bridge type switching circuit |
| CN113568339B (en) * | 2021-07-15 | 2023-03-21 | 许继电气股份有限公司 | Converter fixed time delay control method and device |
| CN113965053A (en) * | 2021-10-27 | 2022-01-21 | 上海电气风电集团股份有限公司 | PWM narrow pulse eliminating method and single-phase and three-phase PWM narrow pulse eliminating device |
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