CN106374781A - Energy feedback type variable-frequency soft starter and control method thereof - Google Patents
Energy feedback type variable-frequency soft starter and control method thereof Download PDFInfo
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- CN106374781A CN106374781A CN201611014891.1A CN201611014891A CN106374781A CN 106374781 A CN106374781 A CN 106374781A CN 201611014891 A CN201611014891 A CN 201611014891A CN 106374781 A CN106374781 A CN 106374781A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
The invention belongs to the technical field of three-phase AC asynchronous motor control, and specifically relates to an energy feedback type variable-frequency soft starter and a control method thereof. The existing electronic soft starter has low starting torque, and synchronous switching cannot be realized when a frequency converter is used as a soft starter. The invention provides an energy feedback type variable-frequency soft starter which comprises a three-phase AC input power supply Ua, Ub and Uc, a forward rectifier bridge composed of six diodes D1-D6, a reverse rectifier bridge composed of six diodes VD1-VD6, a forward inverter bridge composed of six insulated gate bipolar transistors VT1-VT6, and a reverse inverter bridge composed of six insulated gate bipolar transistors VT7-VT12. According to the invention, a large-capacity electrolytic capacitor in the intermediate link of a frequency converter is cancelled, a small-capacity film capacitor is used to absorb the peak voltage produced by an inverter switch, and a reverse inverter is used to invert the feedback energy produced by a motor and send the feedback energy to the power grid. Thus, the size of the device is reduced, and the efficiency of energy conversion is improved.
Description
Technical field
The invention belongs to three-phase AC asynchronous motor control technology field is and in particular to a kind of energy feedback type frequency conversion is soft
Starter and its control method.
Background technology
Three-phase AC asynchronous motor stator winding connects the dash current producing during rated voltage across-the-line starting not only fixed
Very big impulsive force is produced on subcoil and rotor cage bar, destroys winding insulation, cause broken bar, cause electrical fault, and
And also can accelerate to wind insulation ag(e)ing, shorten electrical machinery life.It is thus desirable to taking soft start measure.
Three-phase AC asynchronous motor Start Technology divides from speed control principle mainly has soft-start by lowering voltage, discrete variable frequency soft
Start and continuous variable voltage variable frequency soft start.
(1) soft-start by lowering voltage technology
Three-phase thyristor phase-shifting trigger soft-start by lowering voltage (i.e. electronic type soft start) is that the current soft starter market mainstream is produced
Product.It is the Trigger Angle by changing the IGCT being connected on the every phase winding of three-phase AC asynchronous motor stator, to change
Being applied to the voltage waveform on three-phase AC asynchronous motor stator winding, thus reaching decompression speed purpose, can effectively reduce
Starting current.Limited by speed regualtion of AC motor theory, when reduction supply voltage does not change supply frequency, alternating current generator starts and turns
Square becomes a square times reduction.Therefore three-phase thyristor phase-shifting trigger soft-start by lowering voltage is not suitable for heavy-load start.
(2) discrete variable frequency Start Technology
In order to improve starting torque, reducing starting current the control method it is thus proposed that using discrete variable frequency soft start.
Discrete variable frequency pressure regulation Start Technology utilizes IGCT phase-shifting trigger, and three-phase main-frequency alternating current power supply is selectively turned on, thus
Form voltage (n=1,2,3...) waveform of 50/n hz.It belongs to frequency control in principle and turns although starting can be improved
Square, but because harmonic torque is big, vibrations ambassador's electric current reduces, the effect of torque magnification is affected.
On this basis, also it is proposed that Start Technology based on space voltage vector, can effectively reduce harmonic wave and contain
Amount, and after completing soft start, bypass changeover is simple to operate to power frequency supply.But it is soft that this technology still belongs to discrete variable frequency
Starting technique.Discrete variable frequency soft start progressively can only switch up to 50hz in Frequency points such as 50/nhz (n=1,2,3...).Every phase
The two frequency dot spacings facing are larger, and frequency error factor and change in voltage are carried out simultaneously, and the dash current that thus brings, torque are also relatively
Greatly, cause Soft Start-up Process concussion acutely.
(3) converter is used for three-phase AC asynchronous motor control of soft
The variable-frequency control technique that the eighties in 20th century grows up, in addition to the speed governing operation of controllable motor, also perfectly
Solve the problems, such as asynchronous machine soft start.But frequency converter output voltage is asynchronous in phase place with input voltage, in soft start
After the completion of bypass changeover to during power frequency supply exist switching when current break phenomenon, under worst case, switching electric current is up to motor
2 times of across-the-line starting dash current, are up to the present difficult to the synchronism switching problem that effectively solving is converted to power frequency.Additionally, becoming
Frequency device is used for the big capacity electrolyte capacitor that rectification output filtering and three-phase AC asynchronous motor feedback energy absorb, and causes frequency conversion
The shortcomings of body amasss increase, cost increases, electric energy service efficiency reduces, service life is short.
Content of the invention
In view of this, present invention is primarily targeted at providing a kind of energy feedback type adjustable speed soft starter and its controlling party
Method.
For reaching above-mentioned purpose, the technical scheme is that and be achieved in that:
A kind of energy feedback type adjustable speed soft starter, this starter include three-phase alternating current input power ua, ub, uc, six
The positive rectifier bridge of diode d1～d6 composition, the reverse rectifier bridge of six diode vd1～vd6 compositions, six insulated gates are double
Positive inverter bridge that bipolar transistor vt1～vt6 is constituted, six insulated gate bipolar transistor vt7～vt12 compositions reverse
Inverter bridge；
Described three-phase alternating current input power ua, ub, uc, a road is used for exporting three-phase alternating current input voltage, and another road is through solely
Vertical switch k21, k22, k23 are connected the control completing that line voltage powers to the load with three-phase AC asynchronous motor；
Described forward direction rectifier bridge, for being transformed to the Rectified alternating current with six kinds of pulses waveform by three-phase alternating current input voltage
Pressure；
Described reverse rectifier bridge, for three-phase AC asynchronous motor winding terminal voltage be higher than DC bus-bar voltage when,
By three-phase AC asynchronous motor energy back to DC link；
Described forward direction inverter bridge, for being output as three-phase alternating voltage u by DC tache voltage inversiona、ub、uc, export
Three-phase AC asynchronous motor；
Described reverse inverter bridge, for sending DC link energy inversion into electrical network it is ensured that DC tache voltage is expectation
Six kinds of pulses waveform voltage.
It is in series with straight between described forward direction rectifier bridge and reverse rectifier bridge or between positive inverter bridge and reverse inverter bridge
Stream bus current testing circuit im.
It is parallel with use between described forward direction rectifier bridge and reverse rectifier bridge or between positive inverter bridge and reverse inverter bridge
Low capacity thin-film capacitor c in the peak voltage filtering igbt switch motion generation.
It is parallel with electricity between described forward direction rectifier bridge and reverse rectifier bridge or between positive inverter bridge and reverse inverter bridge
The bleeder circuit that resistance r1, r2 are constituted.
It is provided between described forward direction inverter bridge and three-phase AC asynchronous motor and supply to load for adjustable speed soft starter
Independent switch k11, k12, k13 of the switching control of electricity.
A kind of control method of energy feedback type adjustable speed soft starter, the method is: rises in three-phase AC asynchronous motor
When dynamic, line voltage (ua, ub, uc) first through positive rectifier bridge (d1～d6) rectification, the three phase sine alternating voltage of input
Be converted to the pulsating dc voltage of intermediate link, described forward direction inverter bridge (vt1～vt6) is using based on space vector pulse duration
Intermediate link pulsating dc voltage inversion is pulse voltage (u by modulation techniquea、ub、uc) output, pulse voltage fundamental wave is frequency
The sinusoidal voltage controlled with amplitude, is altered in steps frequency and the amplitude of positive inverter bridge output voltage, completes three-phase alternating current
The control of soft of asynchronous motor.
The method also includes: when positive inverter bridge output voltage frequency reaches 50hz and three-phase AC asynchronous motor operation
After stable, independent switch k11, k12, k13 are disconnected, simultaneously independent switch k21, k22, k23 closure complete phase asynchronous
Motor is powered the bypass changeover powered to electrical network from adjustable speed soft starter.
The method also includes: according to the phase place of input line voltage uabAnd inverter switching states s differentiate successively three-phase around
Whether group meets synchronism switching condition；The upper brachium pontis on off state variable of the positive inverter bridge (vt1～vt6) of definition is s, if s=1,
Brachium pontis conducting in expression, lower brachium pontis turns off；If s=0, in expression, brachium pontis turns off, lower brachium pontis conducting, the positive inverter bridge three-phase of definition
Switch combination vector is (sasbsc), positive inverter bridge output voltage space vector is expressed as vi(i=0,1,2 ... 6,7), its
In, v0、v7For zero vector, remaining is effective vector；WhenWhen and inverter switching states s=v1(100) when, three
Cross streams asynchronous motor b phase stator winding is changeable, and handover operation disconnects k12 closure k22；WhenAnd it is inverse
Become device on off state s=v2(110) when, three-phase AC asynchronous motor a phase stator winding is changeable, and handover operation disconnects k11
Closure k21；WhenAnd inverter switching states s=v3(010), when, three-phase AC asynchronous motor c phase is fixed
Sub- winding is changeable, and handover operation disconnects k13 closure k23；WhenAnd inverter switching states s=v4
(011) when, three-phase AC asynchronous motor b phase stator winding is changeable, and handover operation disconnects k12 closure k22；WhenAnd inverter switching states s=v5(001), when, three-phase AC asynchronous motor a phase stator winding can be cut
Change, handover operation disconnects k11 closure k21；WhenAnd inverter switching states s=v6(101) when, three-phase
AC asynchronous motor c phase stator winding is changeable, and handover operation disconnects k13 closure k23.
The method also includes: when three-phase AC asynchronous motor stator winding terminal voltage is higher than intermediate link pulsating volage
When, DC bus current im is negative value, and three-phase AC asynchronous motor charges to thin-film capacitor, three-phase AC asynchronous motor energy
There is feedback in amount, differentiate and choose input grid line voltage uab, ubc, the maximum of uca, uba, ucb, uac first, secondly,
Choose reverse inverter leg by the brachium pontis of maximum voltage corresponding forward direction rectifier bridge conducting to be triggered；Particularly as follows: working as direct current
When bus current im < 0 and uab are maximum, triggering and conducting vt7 and vt10；As DC bus current im < 0 and ubc maximum, triggering
Conducting vt9 and vt12；When DC bus current im < 0 and uca are maximum, triggering and conducting vt11 and vt8；Work as DC bus current
When im < 0 and uba are maximum, triggering and conducting vt9 and vt8；When DC bus current im < 0 and ucb are maximum, triggering and conducting vt11 and
vt10；When DC bus current im < 0 and uac are maximum, triggering and conducting vt7 and vt12.
Compared with prior art, beneficial effects of the present invention:
The present invention can solve the problem that existing Electronic Soft Starter starting torque is low, converter again can not be synchronous as soft starter
A difficult problem for switching, can achieve the purpose of three-phase AC asynchronous motor energy feedback simultaneously；The present invention cancels ring in the middle of converter
Section big capacity electrolyte capacitor, absorbs, with low capacity thin-film capacitor, the peak voltage that inverter switching device produces, with reverse inverter handle
Electrical network is sent in the feedback energy inversion that motor produces, and reduces equipment volume, improves energy conversion efficiency.
Brief description
Fig. 1 provides a kind of main circuit structure figure of energy feedback type adjustable speed soft starter for the embodiment of the present invention；
Fig. 2 is adjustable speed soft starter three-phase input voltage and intermediate link voltage oscillogram；
Fig. 3 is space voltage vector figure.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.
The embodiment of the present invention provides a kind of energy feedback type adjustable speed soft starter, as shown in figure 1, this starter includes three-phase
Alternating current input power supplying ua, ub, uc, the positive rectifier bridge of six diode d1～d6 compositions, six diode vd1～vd6 are constituted
Reverse rectifier bridge, six insulated gate bipolar transistor vt1～vt6 constitute positive inverter bridge, six insulated gate bipolars
The reverse inverter bridge that transistor vt7～vt12 is constituted；
Described three-phase alternating current input power ua, ub, uc, a road is used for exporting three-phase alternating current input voltage, and another road is through solely
Vertical switch k21, k22, k23 are connected the control completing that line voltage powers to the load with three-phase AC asynchronous motor；
Described forward direction rectifier bridge, for being transformed to the Rectified alternating current with six kinds of pulses waveform by three-phase alternating current input voltage
Pressure；
Described reverse rectifier bridge, for three-phase AC asynchronous motor winding terminal voltage be higher than DC bus-bar voltage when,
By three-phase AC asynchronous motor energy back to DC link；
Described forward direction inverter bridge, for DC tache voltage inversion is output as three-phase alternating voltage ua, ub, uc, output
To three-phase AC asynchronous motor；
Described reverse inverter bridge, for sending DC link energy inversion into electrical network it is ensured that DC tache voltage is expectation
Six kinds of pulses waveform voltage.
It is in series with straight between described forward direction rectifier bridge and reverse rectifier bridge or between positive inverter bridge and reverse inverter bridge
Stream bus circuit testing circuit im.
It is parallel with use between described forward direction rectifier bridge and reverse rectifier bridge or between positive inverter bridge and reverse inverter bridge
Low capacity thin-film capacitor c in the peak voltage filtering igbt switch motion generation.
It is parallel with electricity between described forward direction rectifier bridge and reverse rectifier bridge or between positive inverter bridge and reverse inverter bridge
The bleeder circuit that resistance r1, r2 are constituted.
It is provided between described forward direction inverter bridge and three-phase AC asynchronous motor and supply to load for adjustable speed soft starter
Independent switch k11, k12, k13 of the switching control of electricity.
The present invention cancels converter intermediate link big capacity electrolyte capacitor, absorbs inverter switching device with low capacity thin-film capacitor
The peak voltage producing, electrical network is sent in feedback energy inversion motor being produced with reverse inverter bridge.
The embodiment of the present invention also provides a kind of control method of energy feedback type adjustable speed soft starter, phase asynchronous
During motor starting, line voltage (ua, ub, uc) first through positive rectifier bridge (d1～d6) rectification, the three phase sine of input
Alternating voltage is converted to the pulsating dc voltage of intermediate link, as shown in Figure 2.Positive inverter (vt1～vt6) is using based on sky
Between vector pulse width modulating technology (space vector pulse width modulation, abbreviation svpwm), middle
Link pulsating dc voltage inversion is that pulse voltage (ua, ub, uc) exports, and pulse voltage fundamental wave is frequency and amplitude is variable just
String alternating voltage, is altered in steps frequency and the amplitude of positive inverter output voltage, completes the soft of three-phase AC asynchronous motor
Starting control.After positive inverter output voltage frequency reaches 50hz and three-phase AC asynchronous motor is stable, need
K11, k12, k13 are disconnected, is closed at k21, k22, k23 and completes three-phase AC asynchronous motor being powered by adjustable speed soft starter
The bypass changeover powered to electrical network.If being applied to three-phase AC asynchronous motor stator winding terminal voltage size not before and after switching
Same, will result in switching shock electric current, up to three-phase AC asynchronous motor total head across-the-line starting dash current under worst case
Twice.Preferable switching condition is constant for three-phase AC asynchronous motor stator winding terminal voltage size before and after switching, can be referred to as
Synchronism switching.
The present invention is according to the phase place of input line voltage uabAnd inverter switching states s differentiates whether three-phase windings are full successively
Sufficient synchronism switching condition.Above brachium pontis on off state variable is s to define positive inverter (vt1～vt6) as shown in Figure 1 first.If s
=1, brachium pontis conducting in expression, lower brachium pontis turns off；If s=0, in expression, brachium pontis turns off, lower brachium pontis conducting.The positive inverter of definition
Threephase switch mix vector is (sasbsc).Positive inverter output voltage space vector is expressed as vi(i=0,1,2 ... 6,
7), wherein, v0、v7For zero vector, remaining is effective vector, and effective vector is as shown in Figure 3.The concrete method of discrimination of synchronism switching is:
WhenWhen and inverter switching states s=v1(100), when, three-phase AC asynchronous motor b phase stator winding can be cut
Change, handover operation disconnects k12 closure k22；WhenAnd inverter switching states s=v2(110), when, three intersect
Stream asynchronous motor a phase stator winding is changeable, and handover operation disconnects k11 closure k21；When
And inverter switching states s=v3(010) when, three-phase AC asynchronous motor c phase stator around
Group is changeable, and handover operation disconnects k13 closure k23；WhenAnd inverter switching states s=v4(011) when,
Three-phase AC asynchronous motor b phase stator winding is changeable, and handover operation disconnects k12 closure k22；WhenAnd
Inverter switching states s=v5(001) when, three-phase AC asynchronous motor a phase stator winding is changeable, and handover operation disconnects
K11 closes k21；WhenAnd inverter switching states s=v6(101) when, three-phase AC asynchronous motor c
Phase stator winding is changeable, and handover operation disconnects k13 closure k23.
Energy back-feed control method
When three-phase AC asynchronous motor stator winding terminal voltage is higher than intermediate link pulsating volage, DC bus current im
For negative value, three-phase AC asynchronous motor is to thin-film capacitor charging, the generation feedback of three-phase AC asynchronous motor energy.If no
Reversely inverter control, feedback energy will lead to thin-film capacitor voltage rapidly to rise and then destroys the six kinds of pulses ripple of intermediate link voltage
Waveform simultaneously damages thin-film capacitor.Now, reverse inverter control method is: differentiate first and choose input grid line voltage uab,
The maximum of ubc, uca, uba, ucb, uac, secondly, is chosen reversely by the brachium pontis of maximum voltage corresponding forward direction rectifier bridge conducting
Inverter leg is triggered.Detailed process is: when DC bus current im < 0 and uab are maximum, triggering and conducting vt7 and
vt10；When DC bus current im < 0 and ubc are maximum, triggering and conducting vt9 and vt12；As DC bus current im < 0 and uca
When maximum, triggering and conducting vt11 and vt8；When DC bus current im < 0 and uba are maximum, triggering and conducting vt9 and vt8；When straight
Stream bus current im < 0 and when ucb is maximum, triggering and conducting vt11 and vt10；As DC bus current im < 0 and uac maximum, touch
Send out conducting vt7 and vt12.
The above, only presently preferred embodiments of the present invention, it is not intended to limit protection scope of the present invention.
Claims (9)
1. a kind of energy feedback type adjustable speed soft starter it is characterised in that this starter include three-phase alternating current input power ua,
Positive rectifier bridge that ub, uc, six diode d1～d6 is constituted, the reverse rectifier bridge of six diode vd1～vd6 compositions, six
Positive inverter bridge that insulated gate bipolar transistor vt1～vt6 is constituted, six insulated gate bipolar transistor vt7～vt12
The reverse inverter bridge constituting；
Described three-phase alternating current input power ua, ub, uc, a road is used for exporting three-phase alternating current input voltage, and another road is through independently opening
Close k21, k22, k23 and be connected the control completing that line voltage powers to the load with three-phase AC asynchronous motor；
Described forward direction rectifier bridge, for being transformed to the pulsating dc voltage with six kinds of pulses waveform by three-phase alternating current input voltage；
Described reverse rectifier bridge, for when three-phase AC asynchronous motor winding terminal voltage is higher than DC bus-bar voltage, by three
Cross streams asynchronous motor energy back is to DC link；
Described forward direction inverter bridge, for being output as three-phase alternating voltage u by DC tache voltage inversiona、ub、uc, export three-phase
AC asynchronous motor；
Described reverse inverter bridge, for sending DC link energy inversion into electrical network it is ensured that DC tache voltage is desired six
Pulse waveform voltage.
2. energy feedback type adjustable speed soft starter according to claim 1 it is characterised in that: described forward direction rectifier bridge and anti-
It is in series with DC bus current testing circuit im between rectifier bridge or between positive inverter bridge and reverse inverter bridge.
3. energy feedback type adjustable speed soft starter according to claim 1 and 2 it is characterised in that: described forward direction rectifier bridge
It is parallel with and reverse rectifier bridge between or between positive inverter bridge and reverse inverter bridge and produce for filtering igbt switch motion
Peak voltage low capacity thin-film capacitor c.
4. energy feedback type adjustable speed soft starter according to claim 3 it is characterised in that: described forward direction rectifier bridge and anti-
It is parallel with the bleeder circuit of resistance r1, r2 composition between rectifier bridge or between positive inverter bridge and reverse inverter bridge.
5. energy feedback type adjustable speed soft starter according to claim 4 it is characterised in that: described forward direction inverter bridge and three
Be provided between cross streams asynchronous motor the switching control powering to the load for adjustable speed soft starter independent switch k11,
k12、k13.
6. a kind of control method of energy feedback type adjustable speed soft starter is it is characterised in that the method is: phase asynchronous
During motor starting, line voltage (ua, ub, uc) first through positive rectifier bridge (d1～d6) rectification, the three phase sine of input
Alternating voltage is converted to the pulsating dc voltage of intermediate link, and described forward direction inverter bridge (vt1～vt6) is using based on space vector
Intermediate link pulsating dc voltage inversion is pulse voltage (u by pulse width modulating technologya、ub、uc) output, pulse voltage base
Ripple is frequency and the controlled sinusoidal voltage of amplitude, frequency and the amplitude of positive inverter bridge output voltage is altered in steps, completes
The control of soft of three-phase AC asynchronous motor.
7. energy feedback type adjustable speed soft starter according to claim 6 control method it is characterised in that the method also
Including: after positive inverter bridge output voltage frequency reaches 50hz and three-phase AC asynchronous motor is stable, independently opened
Close k11, k12, k13 disconnect, simultaneously independent switch k21, k22, k23 closure complete three-phase AC asynchronous motor by frequency conversion soft
Dynamic device is powered the bypass changeover powered to electrical network.
8. energy feedback type adjustable speed soft starter according to claim 7 control method it is characterised in that the method also
Including: according to the phase place of input line voltage uabAnd inverter switching states s differentiates whether three-phase windings meet synchronous cutting successively
Change condition；The upper brachium pontis on off state variable of the positive inverter bridge (vt1～vt6) of definition is s, if s=1, brachium pontis conducting in expression, under
Brachium pontis turns off；If s=0, in expression, brachium pontis turns off, lower brachium pontis conducting, and the positive inverter bridge threephase switch mix vector of definition is
(sasbsc), positive inverter bridge output voltage space vector is expressed as vi(i=0,1,2 ... 6,7), wherein, v0、v7For null vector
Amount, remaining is effective vector；WhenWhen and inverter switching states s=v1(100) when, phase asynchronous electronic
Machine b phase stator winding is changeable, and handover operation disconnects k12 closure k22；WhenAnd inverter switching states s
=v2(110) when, three-phase AC asynchronous motor a phase stator winding is changeable, and handover operation disconnects k11 closure k21；WhenAnd inverter switching states s=v3(010), when, three-phase AC asynchronous motor c phase stator winding can be cut
Change, handover operation disconnects k13 closure k23；WhenAnd inverter switching states s=v4(011), when, three intersect
Stream asynchronous motor b phase stator winding is changeable, and handover operation disconnects k12 closure k22；WhenAnd inverter
On off state s=v5(001) when, three-phase AC asynchronous motor a phase stator winding is changeable, and handover operation disconnects k11 closure
k21；WhenAnd inverter switching states s=v6(101) when, three-phase AC asynchronous motor c phase stator around
Group is changeable, and handover operation disconnects k13 closure k23.
9. energy feedback type adjustable speed soft starter according to claim 8 control method it is characterised in that the method also
Including: when three-phase AC asynchronous motor stator winding terminal voltage is higher than intermediate link pulsating volage, DC bus current im
For negative value, three-phase AC asynchronous motor charges to thin-film capacitor, and three-phase AC asynchronous motor energy occurs feedback, sentences first
And choose input grid line voltage uab, ubc, the maximum of uca, uba, ucb, uac, secondly, not corresponding just by maximum voltage
Choose reverse inverter leg to the brachium pontis of rectifier bridge conducting to be triggered；Particularly as follows: when DC bus current im < 0 and uab
When big, triggering and conducting vt7 and vt10；When DC bus current im < 0 and ubc are maximum, triggering and conducting vt9 and vt12；Work as direct current
When bus current im < 0 and uca are maximum, triggering and conducting vt11 and vt8；As DC bus current im < 0 and uba maximum, triggering
Conducting vt9 and vt8；When DC bus current im < 0 and ucb are maximum, triggering and conducting vt11 and vt10；Work as DC bus current
When im < 0 and uac are maximum, triggering and conducting vt7 and vt12.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004865A (en) * | 2018-07-23 | 2018-12-14 | 陕西科技大学 | A kind of doube bridge arm ac-dc-ac inverter soft activator and control method |
| CN114094879A (en) * | 2021-11-11 | 2022-02-25 | 湖北傲云电气有限公司 | High-voltage matrix type variable-frequency soft start device and control method |
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| CN206226325U (en) * | 2016-11-18 | 2017-06-06 | 陕西科技大学 | A kind of energy feedback type adjustable speed soft starter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004865A (en) * | 2018-07-23 | 2018-12-14 | 陕西科技大学 | A kind of doube bridge arm ac-dc-ac inverter soft activator and control method |
| CN109004865B (en) * | 2018-07-23 | 2023-09-26 | 陕西科技大学 | Double-bridge arm AC-DC-AC variable frequency soft starter and control method |
| CN114094879A (en) * | 2021-11-11 | 2022-02-25 | 湖北傲云电气有限公司 | High-voltage matrix type variable-frequency soft start device and control method |
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