CN106787913B - Inverter Dead-time compensation method based on the judgement of permasyn morot current polarity - Google Patents
Inverter Dead-time compensation method based on the judgement of permasyn morot current polarity Download PDFInfo
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- CN106787913B CN106787913B CN201710123137.XA CN201710123137A CN106787913B CN 106787913 B CN106787913 B CN 106787913B CN 201710123137 A CN201710123137 A CN 201710123137A CN 106787913 B CN106787913 B CN 106787913B
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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
- H02M7/53—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
-
- 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
- H02M1/38—Means for preventing simultaneous conduction of switches
Abstract
The present invention proposes a kind of Inverter Dead-time compensation method based on the judgement of permasyn morot current polarity.This method carries out real-time judge using each phase current polarity of the time local iteration least square method to permasyn morot, dead time targetedly is added to the pulse of upper and lower two power switch tubes of each bridge arm by SVPWM technology according to each phase current polar signal obtained, Inverter Dead-time is compensated so that because caused by inverter bridge dead zone current waveform distortion be effectively improved.The algorithm of this method is simple, eliminates coordinate transform link compared to based on the methods of current space vector coordinate transform.The distortion of each phase current waveform of permasyn morot caused by Inverter Dead-time can be effectively reduced.
Description
Technical field
The invention belongs to electrical engineering fields, use traditional sky for the inverter of speed-adjustment System of Permanent
Between vector pulse width modulate (Space Vector Pulse Width Modulation, abbreviation SVPWM) drive pulse signal
Dead time is set and caused by current waveform distortion technical problem, propose a kind of based on permasyn morot current polarity
The method that judgement carries out Inverter Dead-time compensation.
Background technique
Permasyn morot current waveform distortion will cause electric motor overheating exacerbation, and electromagnetic torque fluctuation increases, vibration
Noise increases.It causes current waveform distortion to have two aspect reasons: is led due to permasyn morot design
Permanent magnetism is not ideal sine wave at the back emf waveform of induction in cause stator winding；It on the other hand is three contrary in order to prevent
Become two power switch tube shoot throughs up and down of each bridge arm of device and specially drives arteries and veins into upper and lower two power switch tube S VPWM
Caused by rushing signal setting dead time.
After dead time is added in power switch tube S VPWM driving signal, although effectively preventing each bridge arm of inverter bridge
Two power switch tube shoot throughs up and down, but result in each phase output voltage of inversion and lose, cause permanent magnet synchronous electric
Each phase current waveform of motivation distorts.So far, probably it is divided into two kinds of methods for Inverter Dead-time compensation.A kind of base
In the penalty method of average voltage error, another kind is the penalty method based on pulse.
Method based on average voltage error is simply easily achieved, but is compensated inaccurate.Penalty method based on pulse
Dead time can be accurately compensated, but more demanding to control chip.
Above two method requires to carry out current polarity accurate judgement, and direct shadow whether current polarity correct judgment
Ring the quality of compensation effect.Especially when motor slowly runs, due to current sample noise, when electric current being caused to pass through zero point
It hovers in zero crossings, it is extremely difficult that accurate detection electric current passes through zero point.
It is existing to use novel FIR (Finite Impulse Response, abbreviation FIR) filter be to fixed frequency
The current waveform of rate is filtered without generating phase shift, and the present invention is used can be to not based on time local iteration least square method
Current first harmonics component under same frequency carries out prediction reduction, without generating phase shift, thus to different frequency current first harmonics component
Polarity can carry out accurate judgement.
Summary of the invention
The purpose of the present invention is overcoming existing Inverter Dead-time compensation method, there are the inaccurate technologies that current polarity judges
Problem.The present invention is using time local iteration least square method (Local Time Iterative Least Square, abbreviation
LTILS) each phase current polarity of permasyn morot is judged, it is right respectively by each phase current polar signal of acquisition
It is each that dead time is mutually reset using the SVPWM drive pulse signal that space vector pulse width modulation technology generates, it realizes
Inverter Dead-time compensation, so that reducing driving signal of power switching tube is added current waveform distortion caused by dead time.Not
Under conditions of increasing additional hardware circuit, it need to only be realized by software programming.
To achieve the goals above, a kind of inversion based on the judgement of permasyn morot current polarity proposed by the present invention
Device dead-zone compensation method, firstly, in the digital signal processor of permasyn morot driving inverter, using time part
Fundametal compoment of the interative least square method to the discrete sampling electric current of the permasyn morot A phase comprising noise, B phase and C phase
It is restored, is made accurate judgment to above-mentioned A phase, B phase and C phase current zero crossing, obtained A phase, B phase and C phase current polarity and sentence
Disconnected result；Then, A phase, B phase and the C phase current polarity judging result obtained according to judgement is to by space vector pulse duration tune
The power switch tube drives pulse signal being made believes the space vector pulse width modulation driving pulse of A phase, B phase and C phase
Number addition dead time Td, as dead-time compensation；Wherein:
For A phase, when A phase current is greater than zero and becomes equal to zero by being greater than zero, the upper bridge arm power of inverter A phase
The turn-on instant of switching tube drive pulse signal and shutdown moment with by space vector pulse width modulation obtain not plus dead zone
When drive pulse signal turn-on instant and shutdown the moment be consistent；The lower bridge arm power switch tube drives of inverter A phase
When pulse signal mentions the last period dead zone than the drive pulse signal not plus when dead zone obtained by space vector pulse width modulation
Between TdShutdown, and the lower bridge arm power switch tube drives pulse signal ratio of inverter A phase is by space vector pulse width modulation
What is obtained does not add drive pulse signal when dead zone to postpone one section of dead time TdConducting；When A phase current is less than zero and by small
When zero becomes equal to zero, the turn-on instant of the lower bridge arm power switch tube drives pulse signal of inverter A phase and shutdown moment
With the turn-on instant of the drive pulse signal not plus when dead zone and shutdown moment guarantor obtained by space vector pulse width modulation
It holds consistent；The upper bridge arm power switch tube drives pulse signal of inverter A phase by space vector pulse width modulation than being obtained
Not plus drive pulse signal when dead zone mentions the last period dead time TdShutdown, and the upper bridge arm power switch of inverter A phase
Pipe drive pulse signal does not add drive pulse signal when dead zone to postpone one section than what is obtained by space vector pulse width modulation
Dead time TdConducting；
For B phase, when B phase current is greater than zero and becomes equal to zero by being greater than zero, the upper bridge arm power of inverter B phase
The turn-on instant of switching tube drive pulse signal and shutdown moment with by space vector pulse width modulation obtain not plus dead zone
When drive pulse signal turn-on instant and shutdown the moment be consistent；The lower bridge arm power switch tube drives of inverter B phase
When pulse signal mentions the last period dead zone than the drive pulse signal not plus when dead zone obtained by space vector pulse width modulation
Between TdShutdown, and the lower bridge arm power switch tube drives pulse signal ratio of inverter B phase is by space vector pulse width modulation
What is obtained does not add drive pulse signal when dead zone to postpone one section of dead time TdConducting；When B phase current is less than zero and by small
When zero becomes equal to zero, the turn-on instant of the lower bridge arm power switch tube drives pulse signal of inverter B phase and shutdown moment
With the turn-on instant of the drive pulse signal not plus when dead zone and shutdown moment guarantor obtained by space vector pulse width modulation
It holds consistent；The upper bridge arm power switch tube drives pulse signal of inverter B phase by space vector pulse width modulation than being obtained
Not plus drive pulse signal when dead zone mentions the last period dead time TdShutdown, and the upper bridge arm power switch of inverter B phase
Pipe drive pulse signal does not add drive pulse signal when dead zone to postpone one section than what is obtained by space vector pulse width modulation
Dead time TdConducting；
For C phase, when C phase current is greater than zero and becomes equal to zero by being greater than zero, the upper bridge arm power of inverter C phase
The turn-on instant of switching tube drive pulse signal and shutdown moment with by space vector pulse width modulation obtain not plus dead zone
When drive pulse signal turn-on instant and shutdown the moment be consistent；The lower bridge arm power switch tube drives of inverter C phase
When pulse signal mentions the last period dead zone than the drive pulse signal not plus when dead zone obtained by space vector pulse width modulation
Between TdShutdown, and the lower bridge arm power switch tube drives pulse signal ratio of inverter C phase is by space vector pulse width modulation
What is obtained does not add drive pulse signal when dead zone to postpone one section of dead time TdConducting；When C phase current is less than zero and by small
When zero becomes equal to zero, the turn-on instant of the lower bridge arm power switch tube drives pulse signal of inverter C phase and shutdown moment
With the turn-on instant of the drive pulse signal not plus when dead zone and shutdown moment guarantor obtained by space vector pulse width modulation
It holds consistent；The upper bridge arm power switch tube drives pulse signal of inverter C phase by space vector pulse width modulation than being obtained
Not plus drive pulse signal when dead zone mentions the last period dead time TdShutdown, and the upper bridge arm power switch of inverter C phase
Pipe drive pulse signal does not add drive pulse signal when dead zone to postpone one section than what is obtained by space vector pulse width modulation
Dead time TdConducting.
The method of the present invention is finally realized the virtual voltage of inverter output and is obtained by space vector pulse width modulation
Ideal output voltage not plus when dead zone is consistent, can effectively reduce permasyn morot caused by Inverter Dead-time
The distortion of each phase current waveform, so that the distortion of permasyn morot A phase, B phase and C phase current waveform is effectively improved.
The method of the present invention algorithm is simple, eliminates coordinate transform link compared to based on the methods of current space vector coordinate transform.
Detailed description of the invention
Fig. 1 is the speed-adjustment System of Permanent control block diagram of voltage source inverter power supply；
Fig. 2 (a) to Fig. 2 (d) is respectively that A phase current circulates in upper and lower two power switch tubes of inverter A phase bridge arm
Path profile；
Fig. 3 show traditional inverter SVPWM drive pulse signal dead time TdIt adding method and thereby results in
The schematic diagram of inverter output voltage loss；
Fig. 4, which is shown, carries out current waveform fitting realization inverter SVPWM drive using time local iteration's least square method
Moving pulse signal adds dead time TdThe flow chart of method；
Fig. 5 show inverter SVPWM drive pulse signal using present invention addition dead time TdSchematic diagram；
Fig. 6 show the Inverter Dead-time compensation method control block diagram based on the judgement of permasyn morot current polarity.
Specific embodiment
Embodiment of the present invention is described further in detail with reference to the accompanying drawing.
A kind of Inverter Dead-time compensation method based on the judgement of permasyn morot current polarity proposed by the present invention, such as
It mainly include three parts shown in Fig. 6: (1) by time local iteration least square method to noisy each phase current fundamental wave point
Amount is restored in real time.(2) current polarity judgement is carried out under three-phase ABC coordinate by each phase current fundametal compoment.(3) basis
Each phase current polarity respectively adds the SVPWM output pulse signal of upper and lower two power switch tube devices of each corresponding bridge arm
Add dead time, realizes the compensation in the so-called dead zone to traditional SVPWM control.
The PMSM Control System block diagram of Driven by inverter as shown in Figure 1 as it can be seen that three-phase inverter by three bridges
Arm is constituted, each upper and lower two power switch tube devices composition of bridge arm, in each upper and lower two power switch tube devices of bridge arm
Between be an output end, three output ends of three bridge arms connect with the three-phase windings input terminal of permasyn morot respectively
It connects.As A phase current iAWhen > 0, when V1 driving signal is high level, A phase current flows through access (black solid line with the arrow) as schemed
Shown in 2 (a)；It is continuous by the freewheeling diode of lower bridge arm when V1 driving signal is low level, shown in A phase current such as Fig. 2 (b)
Stream.It can be seen that working as A phase current iAWhen > 0, output voltage is only related with the trigger pulse of upper bridge arm.As A phase current iAWhen < 0,
When V1 driving signal is high level, A phase current is flowed through shown in access such as Fig. 2 (c)；When V1 driving signal is low level, A phase electricity
Stream is by the freewheeling diode afterflow of lower bridge arm as shown in Fig. 2 (d).It can be seen that working as A phase current iAWhen < 0, output electricity
Pressure is only related with the trigger pulse of lower bridge arm.
There is short circuit event straight-through and occurring in upper and lower two power switch tubes of each bridge arm of voltage source inverter in order to prevent
Barrier adds dead time T using to the original PWM obtained by SVPWM technologyd.When the triggering letter for changing same phase upper and lower bridge arm
A dead time T must be arranged in number polarity chron between the failing edge and rising edge of the trigger signal of same phase upper and lower bridge armd
Delay.Traditional inverter SVPWM drive pulse signal dead time TdAdding method and thereby result in inverter output
The schematic diagram of the loss of voltage is as shown in figure 3, in figure, UDCFor DC bus-bar voltage, uAFor A phase bridge arm output A phase voltage,The upper and lower power switch tube V1 of A phase bridge arm of the not yet addition dead time respectively obtained using SVPWM technology,
The drive pulse signal of V4, uV1、uV4Respectively using the upper and lower power switch tube of A phase bridge arm after traditional addition dead time
The drive pulse signal of V1, V4, VerrTo be lost using A phase output voltage after traditional addition dead time.As seen from Figure 3, when
Traditional inverter SVPWM output pulse signal is taken to add dead time TdWhen method, so that the more satisfactory output of output voltage
Voltage has an error, contains 5,7 times and more high reps harmonic component in permasyn morot machine phase voltages, causes each
Also contain 5,7 times and more high reps harmonic current components in phase current waveform, adverse effect is brought to motor operation.
Containing big in the permasyn morot three-phase current discrete signal obtained by digital signal processor (DSP) sampling
High-frequency noise is measured, if directly judging the polarity of three-phase current, this is likely to occur polarity near current zero-crossing point to sentence
Dislocation misses, and filtered current signal is caused to generate phase shift if directly filtering to three-phase current using general filter.Pass through
Time local iteration's least square method (LTILS) is restored in real time to noisy phase current fundametal compoment, then can be to three
The polarity of phase current is correctly judged.
A kind of Inverter Dead-time compensation method based on the judgement of permasyn morot current polarity proposed by the present invention, it is first
First adopted using time local iteration least square method is respectively mutually discrete to the permasyn morot A phase comprising noise, B phase and C phase
The fundametal compoment of sample electric current is restored, to make accurate judgment to each phase current zero crossing, is obtained each phase current polarity and is sentenced
Disconnected result.
By taking A phase as an example, specific implementing procedure is as shown in Figure 4.Firstly, being adopted to permasyn morot A phase current
Sample is restored using fundametal compoment of the time local iteration's least square method to the A phase discrete sampling electric current comprising noise, also
The more original current waveform of current waveform after original does not have phase shift.The time principle of local iteration's least square method is as follows:
By taking A phase as an example, it is assumed that shown in permasyn morot A phase current waveform such as formula (1)
iA(t)=I1sinωt+I2cosωt+ε(t) (1)
In formula (1), ε (t) represents the noise signal in A phase current；I1And I2For two coefficients, different I1And I2Combination
It may be implemented to accurately track original permasyn morot current signal phase.
It is assumed that in time interval [t1, tn] in, n point of sampling can be obtained according to time local iteration's least square method
In formula (2) and formula (3), tj(j=1,2 ..., n) is section [t1, tn] in discrete sampling point.
It can be derived by formula (2) and formula (3)
It is finally obtained by formula (4) and formula (5)
It is obtained by identification
It is exactly the reduction to the original permasyn morot A phase current signal fundametal compoment including noise signal, quite
Digital filtering effect has been carried out in the permasyn morot A phase current signal comprising noise signal come to sampling.Then, will
A phase current is compared with zero, obtains A phase current polarity judging result.
Similarly, the current sampling signal of B and C two-phase can be recognized to obtain by time local iteration least square methodWithWithThe polarity of signal and original current polarity are almost the same, rightWithThe polarity of signal carries out polarity and judges acquired results, can be considered to carry out original three-phase current the knot of polarity judgement
Fruit.
Then, the power obtained by traditional SVPWM technology is opened according to each phase current polarity judging result that judgement obtains
Pipe drive pulse signal is closed, according to each phase current polarity respectively to upper and lower two device for power switching of the same bridge arm of each phase
SVPWM drive pulse signal add dead time Td, that is, carry out so-called dead-time compensation.
By taking A phase as an example, specific implementing procedure is as shown in Figure 4.As seen from Figure 5, when A phase current is greater than zero and by being greater than
Zero when becoming equal to zero, and the output waveform of inverter is only related with the trigger pulse of bridge arm in A phase, so to A phase lower bridge arm
Trigger pulse shifts to an earlier date TdShutdown, be delayed TdIt is open-minded.When A phase current is less than zero and by becoming equal to zero less than zero, inverter
Output waveform is only related with the trigger pulse of A phase lower bridge arm, so the trigger pulse to bridge arm in A phase postpones TdIt is open-minded, and
T in advancedShutdown.Therefore, when A phase current is greater than zero and becomes equal to zero by being greater than zero, bridge arm power can be kept to open
Pipe driving signal is closed still to be consistent with the drive pulse signal not plus when dead zone obtained by traditional SVPWM technology, i.e., on
The turn-on instant of bridge arm power switch tube drives pulse signal and shutdown moment still do not add with what is obtained by traditional SVPWM technology
The turn-on instant of drive pulse signal when dead zone and shutdown moment are consistent, and only for lower bridge arm power switch tube drives
Pulse signal, which is modified, is added dead time Td, i.e., lower bridge arm power switch tube drives pulse signal ratio is by traditional SVPWM skill
What art obtained does not add drive pulse signal when dead zone to mention the last period dead time TdShutdown, and lower bridge arm power switch tube is driven
Moving pulse signal does not add drive pulse signal when dead zone to postpone one section of dead time T than what is obtained by traditional SVPWM technologydIt leads
It is logical；When A phase current is less than zero and by becoming equal to zero less than zero, lower bridge arm driving signal of power switching tube can be kept still
So drive pulse signal when dead zone is not added to be consistent with what is obtained by traditional SVPWM technology, i.e. lower bridge arm power switch tube
The turn-on instant of drive pulse signal and shutdown moment still with the driving arteries and veins not plus when dead zone that is obtained by traditional SVPWM technology
The turn-on instant and shutdown moment for rushing signal are consistent；And it is repaired only for upper bridge arm power switch tube drives pulse signal
Positive that dead time is added, i.e., upper bridge arm power switch tube drives pulse signal does not add dead zone than what is obtained by traditional SVPWM technology
When drive pulse signal mention the last period dead time TdShutdown, and upper bridge arm power switch tube drives pulse signal ratio is by passing
What system SVPWM technology obtained does not add drive pulse signal when dead zone to postpone one section of dead time TdConducting.It achieves that in this way
The virtual voltage that inverter A phase exports and the ideal A phase output voltage one not plus when dead zone obtained by traditional SVPWM technology
It causes, the distortion of permasyn morot A phase current is effectively improved.
Similarly, B phase is handled using above-mentioned the same manner, it can be achieved that the reality that inverter B phase is exported with C phase with C phase
Border voltage is consistent with the ideal B phase not plus when dead zone and C phase output voltage that are obtained by traditional SVPWM technology, permanent-magnet synchronous
The distortion of motor B phase and C phase current is effectively improved.
The method of the present invention can carry out real-time tracking to permasyn morot three-phase current waveform, and can accomplish zero
Phase shift.Algorithm is simple, strong robustness, without additional hardware device, the permasyn morot electric current being suitble under different rotating speeds
Polar judgement, according to current polarity judging result respectively to upper and lower two device for power switching of the same bridge arm of each phase
SVPWM drive pulse signal adds dead time Td, the virtual voltage of inverter three-phase output is achieved that in this way and by tradition
The ideal three-phase output voltage not plus when dead zone that SVPWM technology obtains is consistent, permasyn morot three-phase current it is abnormal
Become to being effectively improved.Also it is achieved that so-called " dead area compensation ".
Inverter Dead-time compensation method proposed by the present invention based on the judgement of permasyn morot current polarity is equally suitable
For Variable Speed System of Multi-phase Permanent Magnetic.
Although above in conjunction with attached drawing, invention has been described, and the invention is not limited to above-mentioned specific implementations
Mode, the above mentioned embodiment is only schematical, rather than restrictive, and those skilled in the art are at this
Under the enlightenment of invention, without deviating from the spirit of the invention, many variations can also be made, these belong to of the invention
Within protection.
Claims (1)
1. a kind of Inverter Dead-time compensation method based on the judgement of permasyn morot current polarity, it is characterised in that: step
It is as follows:
Step 1: using the time, local iteration is minimum in the digital signal processor of permasyn morot driving inverter
Square law restores the fundametal compoment of the discrete sampling electric current of the permasyn morot A phase comprising noise, B phase and C phase,
It makes accurate judgment to above-mentioned A phase, B phase and C phase current zero crossing, obtains A phase, B phase and C phase current polarity judging result；
Step 2: the A phase obtained according to step 1, B phase and C phase current polarity judging result and by space vector pulse duration tune
The power switch tube drives pulse signal being made believes the space vector pulse width modulation driving pulse of A phase, B phase and C phase
Number addition dead time Td, as dead-time compensation；To realize the virtual voltage of inverter output and by space vector arteries and veins
The ideal output voltage not plus when dead zone for rushing that width modulated obtains is consistent, so that permasyn morot A phase, B phase and C phase
The distortion of current waveform is effectively improved；
For A phase, when A phase current is greater than zero and becomes equal to zero by being greater than zero, three phase inverter bridge A phase is upper in inverter
The turn-on instant of bridge arm power switch tube drives pulse signal and shutdown moment with obtained by space vector pulse width modulation
The turn-on instant of drive pulse signal not plus when dead zone and shutdown moment are consistent；The lower bridge arm power of inverter A phase is opened
It closes pipe drive pulse signal and drive pulse signal when dead zone is not added to shift to an earlier date one than what is obtained by space vector pulse width modulation
Section dead time TdShutdown, and the lower bridge arm power switch tube drives pulse signal ratio of inverter A phase is by space vector pulse
What width modulated obtained does not add drive pulse signal when dead zone to postpone one section of dead time TdConducting；When A phase current is less than zero
And when by becoming equal to zero less than zero, the turn-on instant of the lower bridge arm power switch tube drives pulse signal of inverter A phase and
Shutdown moment and the turn-on instant of the drive pulse signal not plus when dead zone and pass obtained by space vector pulse width modulation
The disconnected moment is consistent；The upper bridge arm power switch tube drives pulse signal ratio of inverter A phase is by space vector pulse duration tune
What is be made does not add drive pulse signal when dead zone to mention the last period dead time TdShutdown, and the upper bridge arm of inverter A phase
Power switch tube drives pulse signal is than the drive pulse signal not plus when dead zone that is obtained by space vector pulse width modulation
Postpone one section of dead time TdConducting；
For B phase, when B phase current is greater than zero and becomes equal to zero by being greater than zero, the upper bridge arm power switch of inverter B phase
The turn-on instant of pipe drive pulse signal and shutdown moment with by space vector pulse width modulation obtain not plus when dead zone
The turn-on instant of drive pulse signal and shutdown moment are consistent；The lower bridge arm power switch tube drives pulse of inverter B phase
Signal does not add drive pulse signal when dead zone to mention the last period dead time T than what is obtained by space vector pulse width modulationd
Shutdown, and the lower bridge arm power switch tube drives pulse signal ratio of inverter B phase is obtained by space vector pulse width modulation
The drive pulse signal not plus when dead zone postpone one section of dead time TdConducting；When B phase current is less than zero and by less than zero
When becoming equal to zero, the turn-on instant of the lower bridge arm power switch tube drives pulse signal of inverter B phase and shutdown moment with by
The turn-on instant for drive pulse signal when not adding dead zone that space vector pulse width modulation obtains and shutdown moment keep one
It causes；The upper bridge arm power switch tube drives pulse signal of inverter B phase does not add than what is obtained by space vector pulse width modulation
Drive pulse signal when dead zone mentions the last period dead time TdShutdown, and the upper bridge arm power switch tube of inverter B phase is driven
Moving pulse signal does not add drive pulse signal when dead zone to postpone one section of dead zone than what is obtained by space vector pulse width modulation
Time TdConducting；
For C phase, when C phase current is greater than zero and becomes equal to zero by being greater than zero, the upper bridge arm power switch of inverter C phase
The turn-on instant of pipe drive pulse signal and shutdown moment with by space vector pulse width modulation obtain not plus when dead zone
The turn-on instant of drive pulse signal and shutdown moment are consistent；The lower bridge arm power switch tube drives pulse of inverter C phase
Signal does not add drive pulse signal when dead zone to mention the last period dead time T than what is obtained by space vector pulse width modulationd
Shutdown, and the lower bridge arm power switch tube drives pulse signal ratio of inverter C phase is obtained by space vector pulse width modulation
The drive pulse signal not plus when dead zone postpone one section of dead time TdConducting；When C phase current is less than zero and by less than zero
When becoming equal to zero, the turn-on instant of the lower bridge arm power switch tube drives pulse signal of inverter C phase and shutdown moment with by
The turn-on instant for drive pulse signal when not adding dead zone that space vector pulse width modulation obtains and shutdown moment keep one
It causes；The upper bridge arm power switch tube drives pulse signal of inverter C phase does not add than what is obtained by space vector pulse width modulation
Drive pulse signal when dead zone mentions the last period dead time TdShutdown, and the upper bridge arm power switch tube of inverter C phase is driven
Moving pulse signal does not add drive pulse signal when dead zone to postpone one section of dead zone than what is obtained by space vector pulse width modulation
Time TdConducting.
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| CN108075678B (en) * | 2017-12-23 | 2020-01-10 | 西安交通大学 | Pulse width adjustment-based dead zone effect bilateral compensation method for three-phase inverter |
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| ＳＶＰＷＭ逆变器死区补偿中的电流极性检测;张展等;《大连工业大学学报》;20160930;第35卷(第5期);第386-390页 |
| 三电平逆变器SVPWM的死区补偿和窄脉冲处理;徐华等;《电力电子技术》;20120131;第46卷(第1期);第26-28页 |
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