CN108134541A - A kind of asynchronous machine soft strater and predict-feedback control method on its basis - Google Patents
A kind of asynchronous machine soft strater and predict-feedback control method on its basis Download PDFInfo
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- CN108134541A CN108134541A CN201810033620.3A CN201810033620A CN108134541A CN 108134541 A CN108134541 A CN 108134541A CN 201810033620 A CN201810033620 A CN 201810033620A CN 108134541 A CN108134541 A CN 108134541A
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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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Abstract
A kind of predict-feedback control method the invention discloses asynchronous machine soft strater and on its basis, belong to automatic detection and control technology field, including three phase mains interface, control electric power loop, turn on thyristors angle measure loop, Synchronous signal acquisition module, central secondary processor, serial ports simulation debugging module, thyristor driver and phase control circuit, measure voltage ＆ current circuit, digital-to-analogue A/D conversing circuits, central host processor, bypass control module, human-computer interaction display module and asynchronous machine interface, solves the disorder occurred during step soft starter for motor, the technical issues of concussion and secondary pulse.
Description
Technical field
The invention belongs to automatic detection and control technology field, more particularly to a kind of asynchronous machine soft strater and at it
On the basis of predict-feedback control method.
Background technology
Since threephase asynchronous machine is a kind of counter voltage load, starts initial time in threephase asynchronous machine, number can be generated
The dash current of times rated current of motor.When threephase asynchronous machine power is larger, which can cause network voltage
Fluctuation so that influence with power grid miscellaneous equipment operation conditions.Meanwhile threephase asynchronous machine power factor in start-up course
Angle is continually changing, and particularly when motor speed is close to rated speed, threephase asynchronous machine will appear more apparent
Oscillation phenomenon.Asynchronous machine soft strater is to have merged newest motor control theory, electric motor protecting technology and modern computer skill
The novel intelligent start and stop equipment of art.Conventional asynchronous motor soft starter Thyristor Controlled is generally using opened loop control or based on single
Sample rate current data are controlled, and can not be accomplished preferable dynamic feedback control, be started suitable for application in threephase asynchronous machine
The more demanding occasion of stationarity can not especially solve the disorder occurred in asynchronous machine soft start-up process, concussion and secondary
Shock problem.
Invention content
A kind of predict-feedback control method the object of the present invention is to provide asynchronous machine soft strater and on its basis,
Solves the technical issues of disorder, concussion and secondary pulse occurred during step soft starter for motor.
To achieve the above object, the present invention uses following technical scheme：
A kind of asynchronous machine soft strater detects back including three phase mains interface, control electric power loop, turn on thyristors angle
Road, Synchronous signal acquisition module, central secondary processor, serial ports simulation debugging module, thyristor driver and phase control circuit,
Measure voltage ＆ current circuit, digital-to-analogue A/D conversing circuits, central host processor, bypass control module, human-computer interaction display module and
Asynchronous machine interface；
Central secondary processor is connected with central host processor by spi bus；
Three phase mains interface connects the input terminal of thyristor driver and phase control circuit, thyristor driver and phase control
The output terminal connection asynchronous machine interface of circuit；
Measure voltage ＆ current circuit acquires the voltage signal and electric current of the output terminal of thyristor driver and phase control circuit
Signal, the output terminal connection digital-to-analogue A/D conversing circuits in measure voltage ＆ current circuit；
Digital-to-analogue A/D conversing circuits, bypass control module, human-computer interaction display module are all connected with central host processor；
The input terminal of turn on thyristors angle measure loop and the input terminal of Synchronous signal acquisition module are and thyristor driver
And the input terminal electrical connection of phase control circuit, the output terminal of turn on thyristors angle measure loop and Synchronous signal acquisition module
Output terminal is electrically connected with central secondary processor；
Central host processor and central secondary processor are connect with serial ports simulation debugging module.
The three phase mains interface connects alternating current three-phase electricity；The model STC12C5A60S2 of the central host processor；
The model STC12C5608AD of the center secondary processor；The human-computer interaction display module is touch screen.
The bypass control module is outputs relay, model HF46F；The model of the Synchronous signal acquisition module
For optocoupler PC817.
4. a kind of asynchronous machine soft strater as described in claim 1, it is characterised in that:The measure voltage ＆ current returns
Road includes voltage transformer and current transformer, and voltage transformer and current transformer acquire the thyristor driver and phase respectively
Control the voltage signal and current signal of the output terminal of regulating circuit, the output terminal of voltage transformer and the output terminal of current transformer
It is connect with the digital-to-analogue A/D conversing circuits；
The digital-to-analogue A/D conversing circuits include A/D chip and its peripheral circuit, and the output terminal and electric current of voltage transformer are mutual
The output terminal of sensor is connect with A/D chip；The model ADE7754 of the A/D chip.
Turn on thyristors angle measure loop includes current-limiting resistance, integrated rectifier bridge device, rapid light coupling isolating device
And its peripheral components, one end of the current-limiting resistance are connected with thyristor both ends, the other end is defeated with integrated rectifier bridge device
Enter to be connected；The output of integrated rectifier bridge device is connected with the input of rapid light coupling isolating device primary side, rapid light coupling isolating device
Secondary is exported to be connect with central secondary processor corresponding pin.
It is more that the thyristor driver and phase control circuit include light-coupled isolation device, driving power amplifying device, high frequency
Road pulse transformer, gate leve driving resistance；The light-coupled isolation device primary side input is connected to central secondary processor correspondence and draws
Foot, secondary are connected to the input terminal of driving power amplifying device and high frequency multiplex pulse transformer, high frequency multiplex pulse transformer
Output terminal be connected to gate leve driving resistance one end, gate leve driving resistance the other end be connected to thyristor gate leve pin.
A kind of predict-feedback control method of asynchronous machine soft strater, includes the following steps：
Step 1：A kind of asynchronous machine soft strater is established, three phase mains interface is electrically connected with alternating current three-phase, it will
Asynchronous machine interface connects asynchronous machine；
Step 2：Turn on thyristors angle measure loop is used to detect in the thyristor driver and phase control circuit
Turn on thyristors angle real time data, and generate turn on thyristors angle real time data；
The Synchronous signal acquisition module is used to detect the voltage zero-cross moment of the three phase mains；
The measure voltage ＆ current circuit acquires the voltage letter of the output terminal of the thyristor driver and phase control circuit
Number and current signal, the digital-to-analogue A/D conversing circuits be used for by voltage signal and current signal be converted into digital voltage signal and
Digital current signal；
The thyristor driver and phase control circuit are used to drive asynchronous machine；
The center secondary processor is respectively from turn on thyristors angle measure loop and the synchronous signal acquisition mould
Turn on thyristors angle real time data and voltage zero-cross moment are obtained in block, and brilliant lock is established according to turn on thyristors angle real time data
Pipe angle of flow historical data base generates history turn on thyristors angular data；
Central processing unit obtains digital voltage signal and digital current signal, stores and records digital voltage signal and number
Current signal generates history voltage signal data and historical current signal data；
Step 3：User selects start-up mode by the human-computer interaction display module：Ramp voltage start-up mode is selected,
Then user inputs slope initial voltage data by the human-computer interaction display module, and performs step 4；Select current-limited startup mould
Formula then performs step 5；
Step 4：Ramp voltage start-up mode starts asynchronous machine and includes the following steps：
Step A：Initial Thyristor Controlled Trigger Angle tables of data, the center main process task are equipped in the central host processor
Device receives the slope initial voltage data, and it is oblique that acquisition is calculated by way of looking into initial Thyristor Controlled Trigger Angle tables of data
The corresponding initial Thyristor Controlled triggering angular data of slope initial voltage data, and it is sent to the central secondary processor；
Step B：The center secondary processor receives initial Thyristor Controlled triggering angular data or newest next control
Initial Thyristor Controlled is triggered the crystalline substance of angular data or newest next controlling cycle by the Thyristor Controlled triggering angular data in period
Brake tube phase control trigger angular data is converted into corresponding control level signal, and the control level signal is transmitted to the thyristor
Driving and phase control circuit；
Step C：When the thyristor driver and phase control circuit control the conducting of thyristor according to control level signal
Between and angle, and asynchronous machine is driven to start；
Step D：Turn on thyristors angle measure loop detects turn on thyristors angular data in real time, and by turn on thyristors
Angular data is sent to the central secondary processor, and the turn on thyristors angular data is transferred to institute by the center secondary processor
State central host processor；
Step E：The central host processor is according to turn on thyristors angular data θ0, history turn on thyristors angular data [θ1
θ2 θ3 θ4 θ5 θ6 θ7 θ8 θ9 θ10], digital voltage signal U0With digital current signal I0Boundary condition as calculating makes
With being not involved in specific Trigger Angle and calculate, and initial Thyristor Controlled Trigger Angle tables of data is looked into based on slope initial voltage data
The initial trigger angle [alpha] of acquisition0And start time definite value T0, according to formula αnt=(180- α0)/T0Calculate interior ramp pattern
The corresponding expected Thyristor Controlled triggering angular data of voltage curve, according to predictor formulaIt calculates
Go out the Thyristor Controlled triggering angular data of newest next controlling cycle, and by the thyristor phase of newest next controlling cycle
Control triggering angular data is transferred to the central secondary processor again；
Step F：And repeat step B to step E, until asynchronous machine starts, terminate；
Step 5：Current-limit mode starts asynchronous machine and includes the following steps：
Step G：For presetting a current limliting value data by the human-computer interaction display module；
Step H：The measure voltage ＆ current circuit acquires the output terminal of the thyristor driver and phase control circuit
Voltage signal and current signal, the digital-to-analogue A/D conversing circuits are used to voltage signal and current signal being converted into digital voltage
Signal and digital current signal；The central host processor obtains digital voltage signal and digital current signal；
Step I：The central host processor refers to current limliting value data Iset, digital current signal I0, historical current letter
Number [I1 I2 I3 I4 I5] and turn on thyristors angle real time data θ0Current signal Sudden Changing Rate Δ I=I is calculated1-I0And
Current signal mutation rateBased on Δ I, I！The brilliant lock of next controlling cycle is predicted using PI controllers
Pipe phase control trigger angular data αPI；
The Thyristor Controlled triggering angular data of the next controlling cycle predicted is sent to institute by the central host processor
Central secondary processor is stated, the center secondary processor generation control level signal driving starts asynchronous machine.
A kind of asynchronous machine soft strater of the present invention and predict-feedback control method on its basis, Ke Yiyou
Disorder, concussion and the secondary pulse problem occurred in the improvement asynchronous machine soft start-up process of effect has strong interference immunity, control
Rate-sensitive, robustness be higher and the stronger advantage of adaptability for working condition.
Description of the drawings
Fig. 1 is the principle of the present invention figure block diagram；
Fig. 2 is the schematic diagram of the turn on thyristors angle measure loop of the present invention；
Fig. 3 is the thyristor driver of the present invention and the schematic diagram of phase control circuit.
Specific embodiment
Embodiment 1：
Such as a kind of asynchronous machine soft straters of Fig. 1-Fig. 3, led including three phase mains interface, control electric power loop, thyristor
Current flow angle measure loop, Synchronous signal acquisition module, central secondary processor, serial ports simulation debugging module, thyristor driver and phase
Control regulating circuit, measure voltage ＆ current circuit, digital-to-analogue A/D conversing circuits, central host processor, bypass control module, man-machine friendship
Mutual display module and asynchronous machine interface；
Central secondary processor is connected with central host processor by spi bus；
Three phase mains interface connects the input terminal of thyristor driver and phase control circuit, thyristor driver and phase control
The output terminal connection asynchronous machine interface of circuit；
Measure voltage ＆ current circuit acquires the voltage signal and electric current of the output terminal of thyristor driver and phase control circuit
Signal, the output terminal connection digital-to-analogue A/D conversing circuits in measure voltage ＆ current circuit；
Digital-to-analogue A/D conversing circuits, bypass control module, human-computer interaction display module are all connected with central host processor；
The input terminal of turn on thyristors angle measure loop and the input terminal of Synchronous signal acquisition module are and thyristor driver
And the input terminal electrical connection of phase control circuit, the output terminal of turn on thyristors angle measure loop and Synchronous signal acquisition module
Output terminal is electrically connected with central secondary processor；
Central host processor and central secondary processor are connect with serial ports simulation debugging module.
The three phase mains interface connects alternating current three-phase electricity；The model STC12C5A60S2 of the central host processor；
The model STC12C5608AD of the center secondary processor；The human-computer interaction display module is touch screen.
The bypass control module is to output relay HF46F；The Synchronous signal acquisition module is PC817.
The measure voltage ＆ current circuit includes voltage transformer and current transformer, voltage transformer and current transformer
The voltage signal and current signal of the output terminal of the thyristor driver and phase control circuit are acquired respectively, voltage transformer
The output terminal of output terminal and current transformer is connect with the digital-to-analogue A/D conversing circuits；
The digital-to-analogue A/D conversing circuits include A/D chip and its peripheral circuit, and the output terminal and electric current of voltage transformer are mutual
The output terminal of sensor is connect with A/D chip；The model ADE7754 of the A/D chip.
Turn on thyristors angle measure loop includes current-limiting resistance R100 and R200, integrated rectifier bridge device D22 and fast
Fast light-coupled isolation device BO4 and its peripheral components, one end of the current-limiting resistance R100 and one end of resistance R200 respectively with crystalline substance
Brake tube both ends are connected, and the other end is connected with the input of integrated rectifier bridge device D22；The output of integrated rectifier bridge device D22
It inputs and connects with rapid light coupling isolating device BO4 primary sides, the output of rapid light coupling isolating device BO4 secondary and central secondary processor
Corresponding pin connects.
The thyristor driver and phase control circuit include light-coupled isolation device BO2, driving power amplifying device T5, height
Frequency multiplex pulse transformer B1 and gate leve driving resistance R80 and resistance R88；The light-coupled isolation device BO2 primary sides input connection
In central secondary processor corresponding pin, secondary is connected to driving power amplifying device T5's and high frequency multiplex pulse transformer B1
Input terminal, the output terminal of high frequency multiplex pulse transformer B1 are connected to one end of gate leve driving resistance R80 and resistance R88
One end, the other end and the resistance R88 other ends of gate leve driving resistance R80 are connected to thyristor gate leve pin.
The control electric power loop includes DC5V Voltage stabilizing modules and its peripheral circuit, DC12V Voltage stabilizing modules and its periphery electricity
Road and DC24V Voltage stabilizing modules and its peripheral circuit, the control electric power loop are turn on thyristors angle measure loop, described
Synchronous signal acquisition module, the central secondary processor, the serial ports simulation debugging module, the thyristor driver and phased
Regulating circuit, the measure voltage ＆ current circuit, the digital-to-analogue A/D conversing circuits, the central host processor, the bypass control
Molding block, the human-computer interaction display module and the asynchronous machine interface provide DC5V, DC12V and DC24V direct current.Its work
It is as principle：Three phase mains powers on, and central host processor and central secondary processor after the power is turned on, carry out just entire control system
Then beginningization carries out failure inspection and judges；Corresponding control model and control parameter are issued to center by human-computer interaction module
Primary processor；If selection ramp voltage start-up mode, central host processor receives slope initial voltage data, tables look-up and 1 obtains
Corresponding initial Thyristor Controlled triggering angular data is obtained, and is sent to the central secondary processor, central secondary processor connects
Initial Thyristor Controlled triggering angular data is received, corresponding control level signal is translated into and is transmitted to thyristor driver and phased
Regulating circuit；Thyristor driver and phase control circuit control turn on thyristors time and angle according to the control level signal
Degree, and relevant voltage is exported to the asynchronous machine, turn on thyristors angle measure loop detects turn on thyristors angular data in real time,
And central secondary processor is passed to, turn on thyristors angular data is transferred to central host processor by central secondary processor,
Central host processor receives turn on thyristors angular data, the current signal data that the conversion of modulus A/D conversing circuits obtains, modulus A/
The voltage signal data that the conversion of D conversing circuits obtains, and based on the corresponding expected thyristor phase of interior ramp mode voltage curve
Control triggering angular data, history turn on thyristors angular data calculate the Thyristor Controlled Trigger Angle of newest next controlling cycle
Data, and it is transferred to the central secondary processor again, the phase control of thyristor is carried out, until asynchronous machine starts
Terminate；If selected for current-limited startup pattern, measure voltage ＆ current circuit detection Thyristor Controlled regulating circuit and asynchronous machine
Three-phase simulation current data, and accessed the modulus A/D conversing circuits and carry out necessary number conversion, central main process task
Device receives the current signal that modulus A/D conversing circuits conversion obtains, the current limliting value data issued with reference to human-computer interaction,
Based on newest current sampling signal data, historical current sampled signal data, turn on thyristors angle real time data, electric current is obtained
Sign mutation amount and current signal mutation rate, Accurate Prediction go out the Thyristor Controlled triggering angular data of next controlling cycle, and
It is sent to central secondary processor by the data/address bus being connected between central host processor and central secondary processor,
The Thyristor Controlled triggering angular data of next controlling cycle is converted into corresponding level signal by the central secondary processor
Thyristor driver and phase control circuit are transmitted to, turn on thyristors angle real time data comes from central secondary processor, described
The turn on thyristors angle real time data of central secondary processor comes from coupled turn on thyristors angle measure loop
Output, thyristor driver and phase control circuit trigger angular data according to newest Thyristor Controlled, control the turn on thyristors time
And angle, and relevant voltage is exported to the asynchronous machine, reach current limliting purpose；It is last different no matter using which kind of start-up mode
After walking electric motor starting, bypass contactor can be closed by bypass control module provided by the invention, reduce the operation of device
It is lost and improves product operational reliability.
The bypass control module being connected with the central processing unit, after the asynchronous machine starts, the bypass
Control module is outputed so that the three phase mains is directly direct-connected with the asynchronous machine.
Embodiment 2：
A kind of predict-feedback control method of asynchronous machine soft strater described in embodiment 2 is described in embodiment 1
It realizes, includes the following steps on the basis of a kind of asynchronous machine soft strater：
Step 1：A kind of asynchronous machine soft strater is established, three phase mains interface is electrically connected with alternating current three-phase, it will
Asynchronous machine interface connects asynchronous machine；
Step 2：Turn on thyristors angle measure loop is used to detect in the thyristor driver and phase control circuit
Turn on thyristors angle real time data, and generate turn on thyristors angle real time data；
The Synchronous signal acquisition module is used to detect the voltage zero-cross moment of the three phase mains；
The measure voltage ＆ current circuit acquires the voltage letter of the output terminal of the thyristor driver and phase control circuit
Number and current signal, the digital-to-analogue A/D conversing circuits be used for by voltage signal and current signal be converted into digital voltage signal and
Digital current signal；
The thyristor driver and phase control circuit are used to drive asynchronous machine；
The center secondary processor is respectively from turn on thyristors angle measure loop and the synchronous signal acquisition mould
Turn on thyristors angle real time data and voltage zero-cross moment are obtained in block, and brilliant lock is established according to turn on thyristors angle real time data
Pipe angle of flow historical data base generates history turn on thyristors angular data；
Central processing unit obtains digital voltage signal and digital current signal, stores and records digital voltage signal and number
Current signal generates history voltage signal data and historical current signal data；
Step 3：User selects start-up mode by the human-computer interaction display module：Ramp voltage start-up mode is selected,
Then user inputs slope initial voltage data by the human-computer interaction display module, and performs step 4；Select current-limited startup mould
Formula then performs step 5；
Step 4：Ramp voltage start-up mode starts asynchronous machine and includes the following steps：
Step A：Initial Thyristor Controlled Trigger Angle tables of data, i.e. table 1, the center are equipped in the central host processor
Primary processor receives the slope initial voltage data, is calculated by way of looking into initial Thyristor Controlled Trigger Angle tables of data
The corresponding initial Thyristor Controlled triggering angular data of slope initial voltage data is obtained, and is sent to the central aid in treatment
Device；
It calculates and obtains the corresponding initial Thyristor Controlled triggering angular data of slope initial voltage data, be the side by tabling look-up
What formula carried out, the table of inquiry is as shown in table 1, and table 1 is stored in the central host processor：
Table 1
Initial voltage/% represents the ramp voltage initial voltage number that user is set by human-computer interaction module in table in table 1
According to the percentage size for accounting for nominal voltage data；At the beginning of initial trigger angle/degree represents the corresponding Thyristor Controlled of initial voltage data
Beginning Trigger Angle.
Step B：The center secondary processor receives initial Thyristor Controlled triggering angular data or newest next control
Initial Thyristor Controlled is triggered the crystalline substance of angular data or newest next controlling cycle by the Thyristor Controlled triggering angular data in period
Brake tube phase control trigger angular data is converted into corresponding control level signal, and the control level signal is transmitted to the thyristor
Driving and phase control circuit；
Step C：When the thyristor driver and phase control circuit control the conducting of thyristor according to control level signal
Between and angle, and asynchronous machine is driven to start；
Step D：Turn on thyristors angle measure loop detects turn on thyristors angular data in real time, and by turn on thyristors
Angular data is sent to the central secondary processor, and the turn on thyristors angular data is transferred to institute by the center secondary processor
State central host processor；
Step E：The central host processor is according to turn on thyristors angular data θ0, history turn on thyristors angular data [θ1
θ2 θ3 θ4 θ5 θ6 θ7 θ8 θ9 θ10], digital voltage signal U0With digital current signal I0Boundary condition as calculating makes
With being not involved in specific Trigger Angle and calculate, and the initial trigger angle [alpha] obtained based on slope initial voltage data lookup table 10And it opens
Dynamic time definite value T0, according to formula αnt=(180- α0)/T0Calculate the corresponding expected thyristor of interior ramp mode voltage curve
Phase control trigger angular data, according to predictor formulaCalculate the crystalline substance of newest next controlling cycle
Brake tube phase control trigger angular data, and the Thyristor Controlled triggering angular data of newest next controlling cycle is transferred to institute again
State central secondary processor；
Step F：And repeat step B to step E, until asynchronous machine starts, terminate；
For being applied to squirrel-cage threephase asynchronous machine, motor design parameter is：Rated power PN=7.5kW, it is specified
Electric current IN=15A, rated voltage UN=380V, rated speed nN=1440r/min, power factor 0.80, asynchronous machine is adopted
Use star-connection.Central host processor of the present invention is according to slope initial voltage data, the initial Thyristor Controlled triggering of 1 acquisition of tabling look-up
Angle, is sent to central secondary processor, and central secondary processor is translated into corresponding control level signal and is transmitted to brilliant lock
Pipe drives and phase control circuit, controls turn on thyristors time and angle, and exports relevant voltage to the asynchronous machine, brilliant
Brake tube angle of flow measure loop detects turn on thyristors angular data in real time, and is passed to central secondary processor, center auxiliary
Turn on thyristors angular data is transferred to central host processor by processor, central host processor receive turn on thyristors angular data,
The voltage signal data that modulus A/D conversing circuits convert the current signal data obtained, the conversion of modulus A/D conversing circuits obtains,
And based on the corresponding expected Thyristor Controlled triggering angular data of interior ramp mode voltage curve, history turn on thyristors angle number
According to calculating the Thyristor Controlled triggering angular data of newest next controlling cycle, and it is auxiliary that it is transferred to the center again
Processor is helped, carries out the phase control of thyristor, until asynchronous machine startup terminates, bypass contactor is attracted, and soft strater moves back
Go out to start operating status.
Step 5：Current-limit mode starts asynchronous machine and includes the following steps：
Step G：For presetting a current limliting value data by the human-computer interaction display module；
Step H：The measure voltage ＆ current circuit acquires the output terminal of the thyristor driver and phase control circuit
Voltage signal and current signal, the digital-to-analogue A/D conversing circuits are used to voltage signal and current signal being converted into digital voltage
Signal and digital current signal；The central host processor obtains digital voltage signal and digital current signal；
Step I：The central host processor refers to current limliting value data Iset, digital current signal I0, historical current letter
Number [I1 I2 I3 I4 I5] and turn on thyristors angle real time data θ0Current signal Sudden Changing Rate Δ I=I is calculated1-I0And
Current signal mutation rateBased on Δ I, I！The brilliant lock of next controlling cycle is predicted using PI controllers
Pipe phase control trigger angular data αPI；
The Thyristor Controlled triggering angular data of the next controlling cycle predicted is sent to institute by the central host processor
Central secondary processor is stated, the center secondary processor generation control level signal driving starts asynchronous machine.
A kind of asynchronous machine soft strater of the present invention and predict-feedback control method on its basis, Ke Yiyou
Disorder, concussion and the secondary pulse problem occurred in the improvement asynchronous machine soft start-up process of effect has strong interference immunity, control
Rate-sensitive, robustness be higher and the stronger advantage of adaptability for working condition.
Claims (8)
1. a kind of asynchronous machine soft strater, it is characterised in that：It is led including three phase mains interface, control electric power loop, thyristor
Current flow angle measure loop, Synchronous signal acquisition module, central secondary processor, serial ports simulation debugging module, thyristor driver and phase
Control regulating circuit, measure voltage ＆ current circuit, digital-to-analogue A/D conversing circuits, central host processor, bypass control module, man-machine friendship
Mutual display module and asynchronous machine interface；
Central secondary processor is connected with central host processor by spi bus；
Three phase mains interface connects the input terminal of thyristor driver and phase control circuit, thyristor driver and phase control circuit
Output terminal connection asynchronous machine interface；
Measure voltage ＆ current circuit acquires the voltage signal and current signal of the output terminal of thyristor driver and phase control circuit,
The output terminal connection digital-to-analogue A/D conversing circuits in measure voltage ＆ current circuit；
Digital-to-analogue A/D conversing circuits, bypass control module, human-computer interaction display module are all connected with central host processor；
The input terminal of turn on thyristors angle measure loop and the input terminal of Synchronous signal acquisition module with thyristor driver and phase
Control the input terminal electrical connection of regulating circuit, the output terminal of turn on thyristors angle measure loop and the output of Synchronous signal acquisition module
End is electrically connected with central secondary processor；
Central host processor and central secondary processor are connect with serial ports simulation debugging module.
2. a kind of asynchronous machine soft strater as described in claim 1, it is characterised in that:The three phase mains interface connects city
Electric three-phase electricity；The model STC12C5A60S2 of the central host processor；The model of the center secondary processor
STC12C5608AD；The human-computer interaction display module is touch screen.
3. a kind of asynchronous machine soft strater as described in claim 1, it is characterised in that:The bypass control module is outputs
Relay, model HF46F；The model optocoupler PC817 of the Synchronous signal acquisition module.
4. a kind of asynchronous machine soft strater as described in claim 1, it is characterised in that:The measure voltage ＆ current circuit packet
Voltage transformer and current transformer are included, voltage transformer and current transformer acquire the thyristor driver and phased tune respectively
The voltage signal and current signal of the output terminal of volt circuit, the output terminal of voltage transformer and the output terminal of current transformer with
The digital-to-analogue A/D conversing circuits connection；
The digital-to-analogue A/D conversing circuits include A/D chip and its peripheral circuit, the output terminal and current transformer of voltage transformer
Output terminal connect with A/D chip；The model ADE7754 of the A/D chip.
5. a kind of asynchronous machine soft strater as described in claim 1, it is characterised in that:It detects back at the turn on thyristors angle
Road includes current-limiting resistance, integrates rectifier bridge device and rapid light coupling isolating device and its peripheral components, and the one of the current-limiting resistance
End is connected with thyristor both ends, and the other end is connected with the input of integrated rectifier bridge device；The output of integrated rectifier bridge device
Input and connect with rapid light coupling isolating device primary side, the output of rapid light coupling isolating device secondary with central secondary processor is corresponding draws
Foot connects.
6. a kind of asynchronous machine soft strater as described in claim 1, it is characterised in that:The thyristor driver and phased tune
Volt circuit includes light-coupled isolation device, driving power amplifying device, high frequency multiplex pulse transformer and gate leve driving resistance；It is described
The input of light-coupled isolation device primary side is connected to central secondary processor corresponding pin, secondary be connected to driving power amplifying device and
The input terminal of high frequency multiplex pulse transformer, the output terminal of high frequency multiplex pulse transformer are connected to the one of gate leve driving resistance
End, the other end of gate leve driving resistance are connected to thyristor gate leve pin.
7. a kind of asynchronous machine soft strater as described in claim 1, it is characterised in that:The control electric power loop includes
DC5V Voltage stabilizing modules and its peripheral circuit, DC12V Voltage stabilizing modules and its peripheral circuit and DC24V Voltage stabilizing modules and its periphery electricity
Road, it is described to control electric power loop auxiliary for turn on thyristors angle measure loop, the Synchronous signal acquisition module, the center
Processor, the serial ports simulation debugging module, the thyristor driver and phase control circuit, the measure voltage ＆ current is helped to return
Road, the digital-to-analogue A/D conversing circuits, the central host processor, the bypass control module, the human-computer interaction display module
DC5V, DC12V and DC24V direct current are provided with the asynchronous machine interface.
A kind of 8. predict-feedback control method of asynchronous machine soft strater, it is characterised in that:Include the following steps：
Step 1：A kind of asynchronous machine soft strater is established, three phase mains interface is electrically connected with alternating current three-phase, it will be asynchronous
Motor interface connects asynchronous machine；
Step 2：Turn on thyristors angle measure loop is used to detect the crystalline substance in the thyristor driver and phase control circuit
The real time data of the brake tube angle of flow, and generate turn on thyristors angle real time data；
The Synchronous signal acquisition module is used to detect the voltage zero-cross moment of the three phase mains；
The measure voltage ＆ current circuit acquire the output terminal of the thyristor driver and phase control circuit voltage signal and
Current signal, the digital-to-analogue A/D conversing circuits are used to voltage signal and current signal being converted into digital voltage signal and number
Current signal；
The thyristor driver and phase control circuit are used to drive asynchronous machine；
The center secondary processor is respectively from turn on thyristors angle measure loop and the Synchronous signal acquisition module
Turn on thyristors angle real time data and voltage zero-cross moment are obtained, and thyristor is established according to turn on thyristors angle real time data and is led
Current flow angle historical data base generates history turn on thyristors angular data；
Central processing unit obtains digital voltage signal and digital current signal, stores and records digital voltage signal and digital current
Signal generates history voltage signal data and historical current signal data；
Step 3：User selects start-up mode by the human-computer interaction display module：Ramp voltage start-up mode is selected, then is used
Family inputs slope initial voltage data by the human-computer interaction display module, and performs step 4；Current-limited startup pattern is selected,
Then perform step 5；
Step 4：Ramp voltage start-up mode starts asynchronous machine and includes the following steps：
Step A：Initial Thyristor Controlled Trigger Angle tables of data is equipped in the central host processor, the central host processor connects
The slope initial voltage data are received, are calculated by way of looking into initial Thyristor Controlled Trigger Angle tables of data at the beginning of obtaining slope
The corresponding initial Thyristor Controlled triggering angular data of beginning voltage data, and it is sent to the central secondary processor；
Step B：The center secondary processor receives initial Thyristor Controlled triggering angular data or newest next controlling cycle
Thyristor Controlled triggering angular data, initial Thyristor Controlled is triggered to the thyristor of angular data or newest next controlling cycle
Phase control trigger angular data is converted into corresponding control level signal, and the control level signal is transmitted to the thyristor driver
And phase control circuit；
Step C：The thyristor driver and phase control circuit according to the turn-on time of control level signal control thyristor and
Angle, and asynchronous machine is driven to start；
Step D：Turn on thyristors angle measure loop detects turn on thyristors angular data in real time, and by turn on thyristors angle number
According to sending to the central secondary processor, the center secondary processor by the turn on thyristors angular data be transferred to it is described in
Entreat primary processor；
Step E：The central host processor is according to turn on thyristors angular data θ0, history turn on thyristors angular data [θ1 θ2 θ3
θ4 θ5 θ6 θ7 θ8 θ9 θ10], digital voltage signal U0With digital current signal I0Boundary condition as calculating uses, and does not join
It is calculated with specific Trigger Angle, and the first of initial Thyristor Controlled Trigger Angle tables of data acquisition is looked into based on slope initial voltage data
Beginning trigger angle α0And start time definite value T0, according to formula αnt=(180- α0)/T0Calculate interior ramp mode voltage curve
Corresponding expected Thyristor Controlled triggering angular data, according to predictor formulaIt calculates newest
The Thyristor Controlled triggering angular data of next controlling cycle, and by the Thyristor Controlled Trigger Angle of newest next controlling cycle
Data are transferred to the central secondary processor again；
Step F：And repeat step B to step E, until asynchronous machine starts, terminate；
Step 5：Current-limit mode starts asynchronous machine and includes the following steps：
Step G：For presetting a current limliting value data by the human-computer interaction display module；
Step H：The measure voltage ＆ current circuit acquires the voltage of the output terminal of the thyristor driver and phase control circuit
Signal and current signal, the digital-to-analogue A/D conversing circuits are used to voltage signal and current signal being converted into digital voltage signal
And digital current signal；The central host processor obtains digital voltage signal and digital current signal；
Step I：The central host processor refers to current limliting value data Iset, digital current signal I0, historical current signal data
[I1 I2 I3 I4 I5] and turn on thyristors angle real time data θ0Current signal Sudden Changing Rate Δ I=I is calculated1-I0And electric current letter
Number mutation rateBased on Δ I, I！The Thyristor Controlled of next controlling cycle is predicted using PI controllers
Trigger angular data αPI；
The central host processor by the Thyristor Controlled of the next controlling cycle predicted triggering angular data be sent to it is described in
Secondary processor is entreated, the center secondary processor generation control level signal driving starts asynchronous machine.
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