CN109756157A - A kind of suppressing method of variable frequency soft starter handoff procedure dash current - Google Patents
A kind of suppressing method of variable frequency soft starter handoff procedure dash current Download PDFInfo
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- CN109756157A CN109756157A CN201811648058.1A CN201811648058A CN109756157A CN 109756157 A CN109756157 A CN 109756157A CN 201811648058 A CN201811648058 A CN 201811648058A CN 109756157 A CN109756157 A CN 109756157A
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Abstract
The invention discloses a kind of suppressing methods of variable frequency soft starter handoff procedure dash current, including motor back-emf and ac grid voltage phase difference, difference in magnitude backoff algorithm and main switch combined floodgate Delay Forecast compensation deals, after the completion of variable frequency soft starter soft start, locking phase is carried out to ac grid voltage using phaselocked loop and obtains phase, amplitude, and phase is filtered to AC network sampled voltage, after the compensation such as amplitude, using back-emf and ac grid voltage phase difference as the additional control amount of rotary speed setting value, using back-emf and ac grid voltage difference in magnitude as the additional control amount of flux linkage set value, make phase difference to adjust output voltage phase and amplitude, difference in magnitude is reduced to acceptable motion interval.
Description
Technical field
The invention belongs to variable frequency speed modulation of asynchronous motor technical fields, and in particular to a kind of inhibition variable frequency soft starter switched
The control method of journey dash current can be used for the fields such as high-power industrial electric transmission, rail traffic and marine electric power propulsion.
Background technique
Asynchronous motor is because its structure is simple, easily manufactured, reliable for operation, cheap, sturdy and durable, efficiency is higher etc.
The features such as, it is widely used in various industries, such as industrial electric transmission, rail traffic, marine electric power propulsion field.
When asynchronous machine directly initiates, there are exciting rush current and torque shock electric current, temporary impact total current reaches volume
5~7 times of constant current, may cause that power grid is unstable or even power loss (such as network of ship), it is also possible to will lead to motor machinery
Damage, shortens the working life.It is brought to overcome the problems, such as that asynchronous motor directly initiates, high-power asynchronous motor (such as ship
Oceangoing ship bow, side push away motor) generally require mating soft activator.
Variable frequency soft starter (Soft Starter) is by rectifier (Rectifier), inverter (Inverter) and control
Three-phase alternating current is transformed to direct current by device (Controller) three parts composition, rectifier, and inverter will be straight by controller adjusting
Galvanic electricity be transformed into frequency and amplitude it is controllable three-phase alternating current electric drive motor (Machine) operating.
Variable frequency soft starter because its control flexibly, start-up course it is smooth, to electric network pollution it is small due to be used widely.But
It is that variable frequency soft starter is switched in AC network power supply process after start-up course, because of asynchronous motor back-emf
There are phase and amplitude differences between U2 and ac grid voltage U1, and switching moment impact electric current can be bigger.If without
The problems such as inhibiting, may cause AC network oscillation and motor reduced service life.
Summary of the invention
For above-mentioned variable frequency soft starter dash current, the invention proposes a kind of impacts of variable frequency soft starter handoff procedure
The suppressing method of electric current can effectively reduce switching moment impact electric current, realize the smooth transition of handoff procedure.
The technical solution used to solve the technical problems of the present invention is that: a kind of variable frequency soft starter handoff procedure dash current
Suppressing method, including motor back-emf U2 and ac grid voltage U1 phase difference and difference in magnitude compensation and main switch close a floodgate and prolong
When predictive compensation handle；
The motor back-emf U2 and ac grid voltage U1 phase difference and difference in magnitude compensate are as follows: variable frequency soft starter
After the completion of soft start, i.e., after asynchronous motor is dragged to rated speed by variable frequency soft starter, using phaselocked loop to AC network
Voltage U1 carries out locking phase and obtains its phase and amplitude, and after being filtered the compensation such as phase, amplitude to AC network sampled voltage,
Using the voltage phase difference of motor back-emf U2 and ac grid voltage U1 as the additional control of revolving speed control ring rotary speed setting value
Amount processed, using the voltage amplitude value difference of motor back-emf U2 and ac grid voltage U1 as the attached of magnetic linkage control ring flux linkage set value
Add control amount, so that phase difference, difference in magnitude is reduced to acceptable motion interval to adjust output voltage phase and amplitude；
The main switch combined floodgate Delay Forecast compensation deals are as follows: when phase difference and difference in magnitude are decreased to acceptable dynamic
When section, issue main switch reclosing command, and to main switch combined floodgate delay time carry out predictive compensation processing after, frequency conversion soft start
Device is shut down, and to reduce after soft activator is shut down motor back-emf U2 fall time, reduces motor back-emf U2 and alternating current
The difference of net voltage U1；
With this, by reduce after variable frequency soft starter start completion in handoff procedure asynchronous motor back-emf U2 with exchange
The phase and amplitude of network voltage U1 is poor, and achievees the purpose that inhibit dash current.
Further, described the compensation such as phase, amplitude are filtered to AC network sampled voltage to be: by AC network electricity
Pressure U1 causes delayed phase angle compensation into phaselocked loop locking phase angle after filter process, leads to amplitude attenuation amplitude compensation
Into phaselocked loop amplitude, to eliminate the influence of filter.
Further, by after motor drag to rated speed and stable operation, controller acquisition exchanges variable frequency soft starter
Main power grid three-phase voltage obtains ac grid voltage U1 phase angle θ through phaselocked loop (PLL) locking phasegrid, amplitude uamp；It will be described
Phase angle θgridWith filter phases lag compensation angle θfilterIt is added, then recognizes angle, θ with motor againidfIt makes the difference, obtains
Motor back-emf U2 and ac grid voltage U1 phase difference:
θdelta=θgrid+θfilter-θidf (2)
The amplitude uampIt is added with the offset of filter magnitude decaying, then reconstructs voltage with motor again
urebuiltThat is motor back-emf U2 amplitude makes the difference, and obtains motor back-emf U2 and ac grid voltage U1 difference in magnitude:
udelta=uamp+ufilter-urebuilt (2)
θdeltaAnd udeltaThrough pi regulator (G1(s)=KP+ 1/ (TS), wherein KPFor proportion adjustment parameter, TiIt is adjusted for integral
Save parameter), output revolving speed adds given value nextraGiven value ψ is added with magnetic linkageextra:
Voltage phase difference is converted to revolving speed and adds given value n by formula (1) and formula (3)extra；Formula (2) and formula (3) are by voltage amplitude
Value difference is converted to magnetic linkage and adds given value ψextra, revolving speed adds given value and rotary speed setting value n*It is added as the given of der Geschwindigkeitkreis
Value nref, magnetic linkage adds given value and flux linkage set value ψ*It is added the given value ψ as magnetic linkage ringrefI.e.
The given value n of der Geschwindigkeitkreisref, magnetic linkage ring given value ψrefElectric current i is exported with variable frequency soft starterabc, DC bus
Voltage udcAs function G3(s) it inputs, the pulse drive signal of output inverter；G3It (s) include der Geschwindigkeitkreis, magnetic linkage ring, electric current
The functions such as ring, flux observation, Speed Identification；
It, will be electric using motor back-emf U2 and ac grid voltage U1 phase difference as the additional control amount of rotary speed setting value
Motivation back-emf U2 and additional control amount of the ac grid voltage U1 difference in magnitude as flux linkage set value；When phase difference, difference in magnitude
When being decreased to acceptable motion interval, controller issues main switch energization control signal Sctrl, and close a floodgate and be delayed to main switch
It carries out predictive compensation and handles G4(s), to shorten the switching time of transition between variable frequency soft starter and AC network, reduce electronic
Machine back-emf U2 and ac grid voltage U1 phase difference, difference in magnitude；
Pass through main switch feedback states signal SfbkJudge whether variable frequency soft starter switches successfully.
The beneficial effects of the present invention are: control method of the present invention can effectively reduce motor back-emf U2 and AC network electricity
The phase and amplitude difference between U1 is pressed, dash current is reduced, is suitable for the transmission of high-power industrial electric, rail traffic and ship
The fields such as oceangoing ship electric propulsion.
Detailed description of the invention
Fig. 1 is the vector calculus schematic diagram of control method of the present invention；
Fig. 2 variable frequency soft starter functional block diagram of the present invention；
Fig. 3 controller principle figure of the present invention.
Specific embodiment
Below by embodiment, and Fig. 1 to Fig. 3 is combined, the technical solutions of the present invention will be further described.
When asynchronous machine directly initiates, there are exciting rush current and torque shock electric current, temporary impact total current reaches volume
5~7 times of constant current, may cause that power grid is unstable or even power loss (such as network of ship), it is also possible to will lead to motor machinery
Damage, shortens the working life.
Variable frequency soft starter (Soft Starter) is by rectifier (Rectifier), inverter (Inverter) and control
Three-phase alternating current is transformed to direct current by device (Controller) three parts composition, rectifier, and inverter will be straight by controller adjusting
Galvanic electricity be transformed into frequency and amplitude it is controllable three-phase alternating current electric drive motor (Machine) operating.
For the dash current problem of variable frequency soft starter handoff procedure, the present invention using control output voltage phase amplitude with
Track ac grid voltage U1 phase, amplitude, to reduce voltage phase difference, difference in magnitude, and it is split close lock delay carry out prediction benefit
Processing is repaid, voltage phase difference, difference in magnitude are further decreased, achievees the purpose that inhibit dash current.
The present invention studies the switching moment punching of asynchronous motor frequency conversion soft activator by taking three phase full bridge variable frequency soft starter as an example
Hit the suppressing method of electric current.Difference according to the principle of vector calculus, between motor back-emf U2 and ac grid voltage U1
Include two parts: phase difference and difference in magnitude.In order to reduce voltage difference to reach and inhibit in variable frequency soft starter handoff procedure
The purpose of dash current, it is necessary to set about in terms of two, i.e. reduction phase difference and difference in magnitude.
For variable frequency soft starter by after motor drag to rated speed and stable operation, controller acquisition exchanges main power grid three-phase
Voltage obtains ac grid voltage U1 phase angle θ through phaselocked loop (PLL) locking phasegrid, amplitude uamp；By the phase angle θgrid
With filter phases lag compensation angle θfilterIt is added, then recognizes angle, θ with motor againidfIt makes the difference, it is anti-electric to obtain motor
Gesture U2 and ac grid voltage U1 phase difference:
θdelta=θgrid+θfilter-θidf (3)
The amplitude uampIt is added with the offset of filter magnitude decaying, then reconstructs voltage with motor again
urebuiltThat is motor back-emf U2 amplitude makes the difference, and obtains motor back-emf U2 and ac grid voltage U1 difference in magnitude:
udelta=uamp+ufilter-urebuilt (2)
θdeltaAnd udeltaThrough pi regulator (G1(s)=KP+ 1/ (TS), wherein KPFor proportion adjustment parameter, TiIt is adjusted for integral
Save parameter), output revolving speed adds given value nextraGiven value ψ is added with magnetic linkageextra:
Voltage phase difference is converted to revolving speed and adds given value n by formula (1) and formula (3)extra；Formula (2) and formula (3) are by voltage amplitude
Value difference is converted to magnetic linkage and adds given value ψextra, revolving speed adds given value and rotary speed setting value n*It is added as the given of der Geschwindigkeitkreis
Value nref, magnetic linkage adds given value and flux linkage set value ψ*It is added the given value ψ as magnetic linkage ringrefI.e.
The given value n of der Geschwindigkeitkreisref, magnetic linkage ring given value ψrefElectric current i is exported with variable frequency soft starterabc, DC bus
Voltage udcAs function G3(s) it inputs, the pulse drive signal of output inverter；G3It (s) include der Geschwindigkeitkreis, magnetic linkage ring, electric current
The functions such as ring, flux observation, Speed Identification, are not belonging to the content of present invention, so repeating no more.
It, will be electric using motor back-emf U2 and ac grid voltage U1 phase difference as the additional control amount of rotary speed setting value
Motivation back-emf U2 and additional control amount of the ac grid voltage U1 difference in magnitude as flux linkage set value；When phase difference, difference in magnitude
When being decreased to acceptable motion interval, controller issues main switch energization control signal Sctrl, and close a floodgate and be delayed to main switch
It carries out predictive compensation and handles G4(s), to shorten the switching time of transition between variable frequency soft starter and AC network, reduce electronic
Machine back-emf U2 and ac grid voltage U1 phase difference, difference in magnitude；
Pass through main switch feedback states signal SfbkJudge whether variable frequency soft starter switches successfully.
When motor back-emf U2 and ac grid voltage U1 phase difference and difference in magnitude are decreased to acceptable motion interval,
Controller issues main switch switching signal, and closes a floodgate and be delayed after progress predictive compensation processing to main switch, and variable frequency soft starter stops
Machine inhibits switching moment impact electric current to reduce after soft activator is shut down motor back-emf U2 fall time.Pass through the phase
Position, amplitude compensation control algolithm combination Delay Forecast compensation deals can effectively reduce the phase difference between back-emf and network voltage
And difference in magnitude, to reduce the dash current in handoff procedure.
The range of the claims in the present invention protection is not limited to the above embodiments.
Claims (3)
1. a kind of suppressing method of variable frequency soft starter handoff procedure dash current, it is characterised in that: step is
After asynchronous motor is dragged to rated speed by variable frequency soft starter, ac grid voltage U1 is locked using phaselocked loop
Its phase and amplitude is mutually obtained, and after being filtered phase, amplitude compensation to AC network sampled voltage, by motor back-emf
Additional control amount of the voltage phase difference of U2 and ac grid voltage U1 as revolving speed control ring rotary speed setting value, motor is anti-
Additional control amount of the voltage amplitude value difference of potential U2 and ac grid voltage U1 as magnetic linkage control ring flux linkage set value, to adjust
Output voltage phase and amplitude makes phase difference, difference in magnitude be reduced to acceptable motion interval；
When phase difference and difference in magnitude are decreased to acceptable motion interval, main switch reclosing command is issued, and close to main switch
After lock delay time carries out predictive compensation processing, variable frequency soft starter is shut down, anti-electric to reduce motor after soft activator is shut down
Gesture U2 fall time reduces the difference of motor back-emf U2 and ac grid voltage U1；
With this, pass through asynchronous motor back-emf U2 and AC network in handoff procedure after reduction variable frequency soft starter start completion
The phase and amplitude of voltage U1 is poor, and achievees the purpose that inhibit dash current.
2. a kind of suppressing method of variable frequency soft starter handoff procedure dash current according to claim 1, feature exist
In, it is described phase is filtered to AC network sampled voltage, amplitude compensation is: by ac grid voltage U1 through filter at
Cause delayed phase angle compensation into phaselocked loop locking phase angle after reason, cause amplitude attenuation amplitude compensation to phaselocked loop amplitude
In, to eliminate the influence of filter.
3. a kind of suppressing method of variable frequency soft starter handoff procedure dash current according to claim 1 or 2, feature
It is, for variable frequency soft starter by after motor drag to rated speed and stable operation, controller acquisition exchanges main power grid three-phase electricity
Pressure, obtains ac grid voltage U1 phase angle θ through phaselocked loop (PLL) locking phasegrid, amplitude uamp；By the phase angle θgridWith
Filter phases lag compensation angle θfilterIt is added, then recognizes angle, θ with motor againidfIt makes the difference, obtains motor back-emf
U2 and ac grid voltage U1 phase difference:
θdelta=θgrid+θfilter-θidf (1)
The amplitude uampIt is added with the offset of filter magnitude decaying, then reconstructs voltage u with motor againrebuiltIt is i.e. electric
Motivation back-emf U2 amplitude makes the difference, and obtains motor back-emf U2 and ac grid voltage U1 difference in magnitude:
udelta=uamp+ufilter-urebuilt (2)
θdeltaAnd udeltaThrough pi regulator (G1(s)=KP+ 1/ (TS), wherein KPFor proportion adjustment parameter, TiFor integral adjustment ginseng
Number), output revolving speed adds given value nextraGiven value ψ is added with magnetic linkageextra:
Voltage phase difference is converted to revolving speed and adds given value n by formula (1) and formula (3)extra；Formula (2) and formula (3) are by voltage amplitude value difference
It is converted to magnetic linkage and adds given value ψextra, revolving speed adds given value and rotary speed setting value n*It is added the given value as der Geschwindigkeitkreis
nref, magnetic linkage adds given value and flux linkage set value ψ*It is added the given value ψ as magnetic linkage ringrefI.e.
The given value n of der Geschwindigkeitkreisref, magnetic linkage ring given value ψrefElectric current i is exported with variable frequency soft starterabc, DC bus-bar voltage
udcAs function G3(s) it inputs, the pulse drive signal of output inverter；
When phase difference, difference in magnitude are decreased to acceptable motion interval, controller issues main switch energization control signal Sctrl,
And it closes a floodgate to be delayed to main switch and carries out predictive compensation processing G4(s), to shorten transition between variable frequency soft starter and AC network
Switching time, reduce motor back-emf U2 and ac grid voltage U1 phase difference, difference in magnitude；
Pass through main switch feedback states signal SfbkJudge whether variable frequency soft starter switches successfully.
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| CN112737454A (en) * | 2020-12-15 | 2021-04-30 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Automatic optimization control method for permanent magnet synchronous motor |
| CN112865068A (en) * | 2019-11-27 | 2021-05-28 | 中国船舶重工集团公司第七一九研究所 | Linear attenuation voltage compensation control method for dual-power switching device |
| CN113113936A (en) * | 2021-03-08 | 2021-07-13 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Power balance control method for asynchronous power generation system of direct-current power station |
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| CN113113936B (en) * | 2021-03-08 | 2022-05-27 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Power balance control method for asynchronous power generation system of direct-current power station |
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