CN103916000A - Galloping start control method of frequency converter - Google Patents
Galloping start control method of frequency converter Download PDFInfo
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- CN103916000A CN103916000A CN201410079831.2A CN201410079831A CN103916000A CN 103916000 A CN103916000 A CN 103916000A CN 201410079831 A CN201410079831 A CN 201410079831A CN 103916000 A CN103916000 A CN 103916000A
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- frequency converter
- frequency
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- sampling
- line voltage
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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
- H02P27/047—V/F converter, wherein the voltage is controlled proportionally with the frequency
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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
- H02P1/02—Details
- H02P1/029—Restarting, e.g. after power failure
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
Abstract
A galloping start control method of a frequency converter comprises the steps that the line voltage of the frequency converter is sampled, processed correspondingly and then output to a digital signal processor, and then a sampling software hysteresis method is used for shaping positive voltage to obtain square-wave voltage signals. The frequency of the square-wave voltage signals is calculated, and the start method of the frequency converter is controlled according to the frequency of the square-wave voltage signals. Particularly, when the frequency of the square-wave voltage signals is larger than or equal to 1 Hz, the frequency converter is in a rotation state, and therefore the frequency converter is controlled to start at the current frequency, and damage to the frequency converter or a load caused by reverse rotation of the frequency converter or inconsistence of the current rotation frequency is avoided. The calculation method of the galloping start control method of the frequency converter is simple, convenient and rapid to operate, and galloping start control over the frequency converter can be finished without a complex algorithm.
Description
Technical field
The present invention relates to frequency converter and start control method, particularly relate to the simple frequency converter Fly a car start of a kind of algorithm control method.
Background technology
High-power high voltage frequency converter is widely used in various blower fans, the pump apparatus of the industries such as petrochemical industry, electric power, metallurgy, urban construction, at energy-conservation of consumption reduction, improve the aspects such as technique and play an important role.But along with the expansion in system applies field, simple Speedless sensor VVVF controls high-power high voltage frequency converter and also has the perfect function of many need, and the frequency converter startup so-called " Fly a car start " that rotor is under rotation status is exactly important function.In the application scenarios such as some blower fans, pump class, its bringing onto load moment of inertia is generally larger, when its bringing onto load is during also at High Rotation Speed, frequency converter shut down or failure reset after restart and be commonly referred to as " Fly a car start " or be " rotating-speed tracking startup ".Known according to Electrical Motor principle: in the time that stator speed and rotor actual frequency differ larger, if frequency converter directly startup can cause frequency converter overcurrent, overvoltage protection.
In large-scale dragging system, particularly in blower fan application scenario, the moment of inertia of its rotor and institute's carrying device is all very large, and the free parking time from rotation status to inactive state is from dozens of minutes by several hours.If because electrical network reason or misoperation or random interference power on transducer power-down again; at this moment the rotor of motor is also in rotation status; if at this moment frequency converter can only start at stationary rotor state; at a lot of occasion operational environments as strict in the manufacturing technique requirent such as petrochemical process, power plant boiler; the motor that frequency converter drives can not resume operation in time; will make whole system stop production or unit trip; for a large-scale system, unexpected system-down will make user suffer immeasurable economic loss.
Common methods is to carry out tachometric survey by outside speed measuring device in the market, and as photoelectric encoder or optoelectronic switch etc. are measured, but this cannot install for some occasions, and can increase the cost of system and reduce system reliability.
Also have in addition some software approachs to carry out estimated speed, but the complete depended software of this method, it is larger that search effect is affected by software maturity, and have a lot of limitations.
As voltage and the frequency adjustment variation by given electric current and feedback current output in " tracing motor rotation speed by frequency transformer method and device " compares search rate with VF curve voltage, this method can not effectively judge motor drive direction, there will be the situation of motor reversal.And algorithm more complicated.
Summary of the invention
Based on this, be necessary to provide the simple frequency converter Fly a car start of a kind of algorithm control method.
A kind of frequency converter Fly a car start control method, comprises the following steps:
The line voltage of sampling frequency converter, and the line voltage of sampling is treated to and adapts to the positive voltage of digital signal processor and output to described digital signal processor simultaneously;
Adopt software hysteresis method to carry out shaping and obtain square wave voltage signal outputing to the positive voltage of described digital signal processor;
Calculate the frequency of described square wave voltage signal, judge whether the frequency of described square wave voltage signal is less than 1Hz;
The current frequency of pressing if not frequency converter starts frequency converter;
If so, described frequency converter is carried out to excitatory processing, by the line voltage of above-mentioned steps sampling frequency converter and judge whether the frequency of the square-wave signal that line voltage after treatment is corresponding is less than 1Hz;
If so, think and directly start frequency converter processing zero-speed state; The current frequency of pressing if not frequency converter starts frequency converter.
In an embodiment, the step of described sampling frequency converter line voltage comprises therein: the two-way voltage on sampling frequency converter line voltage.
In an embodiment, the step that the described line voltage by sampling is treated to the positive voltage that adapts to digital signal processor comprises therein:
Adopt the operational amplifier of two kinds of multiplication factors to amplify the two-way voltage of the line voltage of described sampling;
Adopt pull-up circuit that the line voltage after amplifying is treated to positive voltage;
The line voltage clamping that is treated to positive voltage is become to adapt to the positive voltage of described digital signal processor.
In an embodiment, be also included in and adopt the operational amplifier of two kinds of multiplication factors to amplify after two-way voltage therein, maximum and the threshold value A of sample line voltage little multiplication factor are compared;
If be less than threshold value A, by sample line Voltage-output large multiplication factor to pull-up circuit;
If be greater than threshold value A, by sample line Voltage-output little multiplication factor to pull-up circuit.
Therein in an embodiment, described employing software hysteresis method is carried out the step that shaping obtains square wave voltage signal and is comprised outputing to the positive voltage of described digital signal processor:
The sample positive voltage of described digital signal processor;
The positive voltage of judgement sampling and the magnitude relationship of voltage threshold B;
In the time that the positive voltage of sampling is greater than positive voltage threshold value B, the positive voltage of described digital signal processor is shaped as to high level;
In the time that the positive voltage of sampling is less than negative voltage threshold B, the positive voltage of described digital signal processor is shaped as to low level;
In the time that the positive voltage of sampling is more than or equal to negative voltage threshold B and is less than or equal to positive voltage threshold value B, the positive voltage of described digital signal processor is shaped as to current level.
In an embodiment, the step of the frequency of the described square wave voltage signal of described calculating comprises therein:
The frequency that is described square wave voltage signal by the inverse statistics of the time between described square wave voltage signal high level rising edge.
In an embodiment, also comprise and judge that whether the frequency of described square wave voltage signal is effective therein.
In an embodiment, the described whether effective step of frequency that judges square wave voltage signal comprises therein:
In the time that occurring rising edge mutually first, the two-route wire voltage U V phase of three-phase circuit and UW calculate corresponding frequency and phase place;
In the time that the UV of three-phase circuit has 3 rising edges mutually, UW has 2 rising edges mutually, and described UV phase is less than 400Hz with the frequency in mutually each cycle of described UW;
Frequency UV11, the UV12 of UV phase and the frequency UW11 of described UW phase are stated in calculating, if the deviation between described frequency UV11, UV12 and UW11 be not more than value separately 90% time, think that the frequency of described square wave voltage signal is effective.
Therein in an embodiment, the described step that described frequency converter is carried out to excitatory processing comprises:
Frequency converter is applied to the speed that frequency is W;
Regulate the rated current of controlling motor by PI;
When detecting the electric current of motor and reaching rated current, by the line voltage of above-mentioned steps sampling frequency converter and judge whether the frequency of the square-wave signal that line voltage after treatment is corresponding is less than 1Hz.
Therein in an embodiment, the described step that described frequency converter is carried out to excitatory processing also comprises:
Frequency converter is applied to frequency be-speed of W;
Regulate the rated current of controlling motor by PI;
When detecting the electric current of motor and reaching rated current, by the line voltage of above-mentioned steps sampling frequency converter and judge whether the frequency of the square-wave signal that line voltage after treatment is corresponding is less than 1Hz.
Above-mentioned frequency converter Fly a car start control method is by the line voltage of sampling frequency converter, and does respective handling and output to digital signal processor.Then the software hysteresis method of sampling is carried out shaping to positive voltage and is obtained square wave voltage signal.Pass through to calculate again the frequency of square wave voltage signal, and control the Starting mode of frequency converter according to the size of square wave voltage signal frequency.The frequency that is specially square wave voltage signal is greater than or when 1Hz, frequency converter, in rotary state, therefore, is controlled frequency converter and started with current frequency, avoids occurring that frequency converter is sent out turns or inconsistent and cause the damage of frequency converter and load with current rotational frequency.And the computational methods of above-mentioned frequency converter Fly a car start control method are simple and efficient, do not need complicated algorithm just can complete the Fly a car start control of frequency converter.
Brief description of the drawings
Fig. 1 is the flow chart of frequency converter Fly a car start control method;
Fig. 2 is the circuit theory diagrams of sampling frequency converter line voltage;
Fig. 3 is the waveform schematic diagram that adopts the shaping of software hysteresis method;
Fig. 4 is UV, UW phase phase frequency relation;
Fig. 5 needs excitatory Fly a car start current-voltage waveform;
Fig. 6 does not need excitatory Fly a car start current-voltage waveform;
Fig. 7 is not for needing Fly a car start current waveform.
Embodiment
As shown in Figure 1, be the flow chart of frequency converter Fly a car start control method.
A kind of frequency converter Fly a car start control method, comprises the following steps:
Step S110, the line voltage of sampling frequency converter, and the line voltage of sampling is treated to and adapts to the positive voltage of digital signal processor and output to described digital signal processor simultaneously.
The step of sampling frequency converter line voltage comprises: the two-way voltage on sampling frequency converter line voltage.
Concrete, the step that the line voltage of sampling is treated to the positive voltage that adapts to digital signal processor comprises:
1. the two-way voltage of the line voltage of described sampling is adopted the operational amplifier of two kinds of multiplication factors to amplify.
2. adopt pull-up circuit that the line voltage after amplifying is treated to positive voltage.
3. the line voltage clamping that is treated to positive voltage is become to adapt to the positive voltage of described digital signal processor.
As shown in Figure 2, be the circuit theory diagrams of sampling frequency converter line voltage.
Sampling frequency converter line potential circuit comprises divider resistance R1, divider resistance R2, amplifier U1, amplifier U2, feedback resistance R4, divider resistance R5, feedback resistance R6, divider resistance R7, divider resistance R11, divider resistance R12, divider resistance R13, divider resistance R14, diode group D4 and diode group D5.
The U phase of divider resistance R1 mono-termination frequency converter three phase mains, the inverting input of another termination amplifier U2.The V phase of divider resistance R2 mono-termination frequency converter three phase mains, the normal phase input end of another termination amplifier U2 and the normal phase input end of amplifier U1.The inverting input of the anti-phase input termination amplifier U2 of amplifier U1.Feedback resistance R4 two ends connect respectively inverting input and the output of amplifier U1.Feedback resistance R6 two ends connect respectively inverting input and the output of amplifier U2.The normal phase input end of divider resistance R5 mono-termination amplifier U1, other end ground connection.Divider resistance R7 mono-termination divider resistance R2, other end ground connection.
Divider resistance R11 mono-termination connects the output of amplifier U1, and the other end is an output of the circuit of sampling frequency converter line voltage.Divider resistance R13 mono-termination connects the output of amplifier U2, and the other end is an output of the circuit of sampling frequency converter line voltage.Diode group D4 comprises the diode of two series connection, the plus earth of the diode of two series connection, and negative pole connects 3.3V power supply.Wherein the points of common connection of the diode of two series connection connects an output of the circuit of sampling frequency converter line voltage.Diode group D4 connects the branch road at amplifier U1 place.
Diode group D5 comprises the diode of two series connection, the plus earth of the diode of two series connection, and negative pole connects 3.3V power supply.Wherein the points of common connection of the diode of two series connection connects another output of the circuit of sampling frequency converter line voltage.Diode group D5 connects the branch road at amplifier U2 place.
Divider resistance R12 mono-termination 3.3V power supply, the points of common connection of the diode of two series connection of another terminating diode group D4.Divider resistance R14 mono-termination 3.3V power supply, the points of common connection of the diode of two series connection of another terminating diode group D5.
Frequency converter Fly a car start control method is also included in and adopts the operational amplifier of two kinds of multiplication factors to amplify after two-way voltage, and maximum and the threshold value A of sample line voltage little multiplication factor are compared;
If be less than threshold value A, by sample line Voltage-output large multiplication factor to pull-up circuit;
If be greater than threshold value A, by sample line Voltage-output little multiplication factor to pull-up circuit.
The principle of sampling frequency converter line potential circuit is as follows:
(UW line voltage detecting circuit principle is identical with it to detect explanation with UV line potential circuit, repeat no more herein) U phase phase voltage through divider resistance R1 be connected, U phase and V phase voltage, through amplifier U1 and two amplifying circuits of amplifier U2, obtain two groups of different amplification coefficients (wherein R6=10*R4).Based on the method for hardware detection output line voltage, introduce the circuit of two kinds of different amplification, improve output line voltage sampling precision.Amplifier U1 output, by divider resistance R11 and divider resistance R12 and 3.3V pull-up circuit, is treated to voltage to be applicable to the positive voltage that DSP processes.After two clamp diode D4, directly send into DSP AD mouth UVad1 below, same amplifier U2 output, by divider resistance R13 and divider resistance R14 and 3.3V pull-up circuit, is treated to voltage to be applicable to the positive voltage that DSP processes.After two clamp diode D5, directly send into DSP AD mouth UVad2 below.
And then process voltage method processing by following software: taking UV mutually for example illustrates: UVad1 as through the less AD voltage of low-pass filtering and zero amplification coefficient partially after treatment, UVad2 as through the larger AD mouth voltage of low-pass filtering and zero amplification coefficient partially after treatment; To UVad1 sampled value maximum, UVad1Max judges, if UVad1Max is less than threshold values A, otherwise follow-up AD analyzes with UVad1 for UVad2; Further maximum determination methods is the size that is just starting to judge each voltage when UVad1 voltage from negative change, by each relatively to voltage max be saved in UVad1Max, judge that termination condition is that voltage becomes and bears.Wherein threshold values A representative value is 40V.
Concrete, suppose that line voltage is the sine wave of amplitude 2V, can judge now by sampling so should be with the larger voltage of amplification coefficient, and this 2V voltage becomes the voltage of 20V, and software processing is more prone to process this signal like this.If only, with original original no process amplifying signal, software likely there will be because the too little voltage that can't detect of output voltage amplitude.
Step S120, adopts software hysteresis method to carry out shaping and obtain square wave voltage signal outputing to the positive voltage of described digital signal processor.
Adopt software hysteresis method to carry out the step that shaping obtains square wave voltage signal and comprise outputing to the positive voltage of described digital signal processor:
1. the sample positive voltage of described digital signal processor.
2. the positive voltage of judgement sampling and the magnitude relationship of voltage threshold B.
3. in the time that the positive voltage of sampling is greater than positive voltage threshold value B, the positive voltage of described digital signal processor is shaped as to high level.
4. in the time that the positive voltage of sampling is less than negative voltage threshold B, the positive voltage of described digital signal processor is shaped as to low level.
5. in the time that the positive voltage of sampling is more than or equal to negative voltage threshold B and is less than or equal to positive voltage threshold value B, the positive voltage of described digital signal processor is shaped as to current level.
There is the judgement of influence of fluctuations sample frequency for fear of sampled voltage zero crossing, therefore adopt software hysteresis method.
If software level after treatment is C, high level=1, low level=0.
C=1 is as sampled voltage >B;
C=0 is as sampled voltage <-B;
Constant work as-B≤sampled voltage≤the B of C=.
As shown in Figure 3, wherein B representative value is 5V to waveform after treatment.
Step S130, calculates the frequency of described square wave voltage signal, judges whether the frequency of described square wave voltage signal is less than 1Hz.
The current frequency of pressing if not frequency converter starts frequency converter;
If so, described frequency converter is carried out to excitatory processing, by the line voltage of above-mentioned steps sampling frequency converter and judge whether the frequency of the square-wave signal that line voltage after treatment is corresponding is less than 1Hz.
The step of calculating the frequency of described square wave voltage signal comprises:
The frequency that is described square wave voltage signal by the inverse statistics of the time between described square wave voltage signal high level rising edge.
Shaping Hou Mei road square wave voltage signal frequency computation part method is: the time between high level rising edge.Phase judgment method is for wherein a road square wave is in the time that rising edge changes, and an other road square wave level just.According to hardware circuit feature, when after the shaping of UV line voltage when square-wave voltage rising edge, if the square-wave voltage after the shaping of VW line voltage is low level, think that motor direction of rotation is for counterclockwise, otherwise motor direction of rotation is clockwise.Or when after the shaping of UW line voltage when square-wave voltage rising edge, if the square-wave voltage after the shaping of UV line voltage is high level, think that motor direction of rotation is for counterclockwise, otherwise motor direction of rotation is clockwise.
In addition in order to reject the factors such as interference, just think that when meeting following three conditions the frequency calculating is effective value, otherwise need to recalculate.
Frequency converter Fly a car start control method also comprises and judges that whether the frequency of described square wave voltage signal is effective.
The whether effective step of frequency that judges square wave voltage signal comprises:
1. in the time that occurring rising edge mutually first, the two-route wire voltage U V phase of three-phase circuit and UW calculate corresponding frequency and phase place.
2. in the time that the UV of three-phase circuit has 3 rising edges mutually, UW has 2 rising edges mutually, and described UV phase is less than 400Hz with the frequency in mutually each cycle of described UW.
3. calculate and state frequency UV11, the UV12 of UV phase and the frequency UW11 of described UW phase, if the deviation between described frequency UV11, UV12 and UW11 be not more than value separately 90% time, think that the frequency of described square wave voltage signal is effective.
First judge that two-route wire voltage U V, UW start to occur that rising edge starts to carry out frequency and phase calculation most, first move as example explanation, as shown in Figure 4 taking UV phase rising edge.
1), in the time that UV has 3 rising edges mutually, UW must have 2 rising edges mutually;
2) the frequency little Yu 400HZ calculating in each cycle;
3) UV11, UV12, be respectively the frequency that UV calculates mutually, UW11 is the frequency that UW calculates mutually, requiring between these three frequencies each other deviation can not be greater than is separately worth 90%.
Frequency computation part method is: choose two immediate frequencies, both are averaged as effective frequency.
Phase-detection is that after shaping, UW square wave level height after shaping appears when second rising edge in UV square wave, if UW is low level after shaping, think that motor direction of rotation is for counterclockwise, otherwise motor direction of rotation is clockwise.In like manner can draw the estimate of situation that first UW phase rising edge moves.
When the frequency of calculating is above less than 1Hz or does not detect that according to method certain time above square wave level changes, thinking and effective voltage signal do not detected, may there are two kinds of situations in this: the first situation is that motor has stopped the rotation and there is no residual pressure signal; When another situation, motor is just at High Rotation Speed, and residual pressure signal decays to very little value (approaching zero) according to rotor time constant.Also there will be overcurrent-overvoltage situation if there is the direct startup of this situation below.Need manually to carry out for this reason excitatory, make motor side produce certain voltage so as subsequent detection use.
The step of described frequency converter being carried out to excitatory processing comprises:
1. frequency converter is applied to the speed that frequency is W.
2. regulate by PI the rated current of controlling motor.
3. when the electric current that detects motor reaches rated current, by the line voltage of above-mentioned steps sampling frequency converter and judge whether the frequency of the square-wave signal that line voltage after treatment is corresponding is less than 1Hz.
Apply the speed that a frequency is W, by detecting current of electric, output voltage is regulated and is obtained by PI, and given electric current is motor rated current.In the time that electric current reaches given electric current, frequency converter stops output.Re-start step 110-step 130; If useful signal also do not detected, re-start excitation processing.
The step of frequency converter being carried out to excitatory processing also comprises:
1. frequency converter is applied to frequency and be-speed of W.
2. regulate by PI the rated current of controlling motor.
3. when the electric current that detects motor reaches rated current, by the line voltage of above-mentioned steps sampling frequency converter and judge whether the frequency of the square-wave signal that line voltage after treatment is corresponding is less than 1Hz.
Apply a frequency and be-rotating magnetic field of the speed of W, output voltage carries out PI closed-loop control according to feedback current, makes feedback current reach motor rated current, in the time that electric current reaches given electric current, frequency converter stops output, re-starts step 110-step 130; If useful signal also do not detected, think that motor is in zero-speed state, directly start.
Step S140, if so, thinks and directly starts frequency converter processing zero-speed state; The current frequency of pressing if not frequency converter starts frequency converter.
After thinking that searching frequency is nonzero value; Frequency converter is from searching current frequency startup, and frequency converter starts with this frequency, and output voltage accelerates to according to certain slope the voltage that VF curve is corresponding simultaneously; Furthermore, accelerate slope and detect that electric current is closely related in transient process, in the time that detection electric current is less than 1/3 motor rated current, acceleration slope is 2 times of normal value, and other value is normal acceleration.Through processing like this, both can ensure motor with one faster the time complete this transient process, can ensure that again current of electric normally exports.
Typical current waveform as shown in Figure 5, Figure 6, therefrom can find out that current waveform is level and smooth, can search rapidly parking front motor running frequency.Wherein Fig. 5 waveform is for needing excitatory waveform, and Fig. 6 is not for needing excitatory waveform.Fig. 7 is without Fly a car start, directly starting current waveform, and as can be seen from Figure 7, inverter current increases gradually until overcurrent protection.
Above-mentioned frequency converter Fly a car start control method is by the line voltage of sampling frequency converter, and does respective handling and output to digital signal processor.Then the software hysteresis method of sampling is carried out shaping to positive voltage and is obtained square wave voltage signal.Pass through to calculate again the frequency of square wave voltage signal, and control the Starting mode of frequency converter according to the size of square wave voltage signal frequency.The frequency that is specially square wave voltage signal is greater than or when 1Hz, frequency converter, in rotary state, therefore, is controlled frequency converter and started with current frequency, avoids occurring that frequency converter is sent out turns or inconsistent and cause the damage of frequency converter and load with current rotational frequency.And the computational methods of above-mentioned frequency converter Fly a car start control method are simple and efficient, do not need complicated algorithm just can complete the Fly a car start control of frequency converter.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a frequency converter Fly a car start control method, comprises the following steps:
The line voltage of sampling frequency converter, and the line voltage of sampling is treated to and adapts to the positive voltage of digital signal processor and output to described digital signal processor simultaneously;
Adopt software hysteresis method to carry out shaping and obtain square wave voltage signal outputing to the positive voltage of described digital signal processor;
Calculate the frequency of described square wave voltage signal, judge whether the frequency of described square wave voltage signal is less than 1Hz;
The current frequency of pressing if not frequency converter starts frequency converter;
If so, described frequency converter is carried out to excitatory processing, by the line voltage of above-mentioned steps sampling frequency converter and judge whether the frequency of the square-wave signal that line voltage after treatment is corresponding is less than 1Hz;
If so, think and directly start frequency converter processing zero-speed state; The current frequency of pressing if not frequency converter starts frequency converter.
2. frequency converter Fly a car start control method according to claim 1, is characterized in that, the step of described sampling frequency converter line voltage comprises: the two-way voltage on sampling frequency converter line voltage.
3. frequency converter Fly a car start control method according to claim 2, is characterized in that,
The step that the described line voltage by sampling is treated to the positive voltage that adapts to digital signal processor comprises:
Adopt the operational amplifier of two kinds of multiplication factors to amplify the two-way voltage of the line voltage of described sampling;
Adopt pull-up circuit that the line voltage after amplifying is treated to positive voltage;
The line voltage clamping that is treated to positive voltage is become to adapt to the positive voltage of described digital signal processor.
4. frequency converter Fly a car start control method according to claim 3, is characterized in that, is also included in and adopts the operational amplifier of two kinds of multiplication factors to amplify after two-way voltage, and maximum and the threshold value A of sample line voltage little multiplication factor are compared;
If be less than threshold value A, by sample line Voltage-output large multiplication factor to pull-up circuit;
If be greater than threshold value A, by sample line Voltage-output little multiplication factor to pull-up circuit.
5. frequency converter Fly a car start control method according to claim 1, is characterized in that, described employing software hysteresis method is carried out the step that shaping obtains square wave voltage signal and comprised outputing to the positive voltage of described digital signal processor:
The sample positive voltage of described digital signal processor;
The positive voltage of judgement sampling and the magnitude relationship of voltage threshold B;
In the time that the positive voltage of sampling is greater than positive voltage threshold value B, the positive voltage of described digital signal processor is shaped as to high level;
In the time that the positive voltage of sampling is less than negative voltage threshold B, the positive voltage of described digital signal processor is shaped as to low level;
In the time that the positive voltage of sampling is more than or equal to negative voltage threshold B and is less than or equal to positive voltage threshold value B, the positive voltage of described digital signal processor is shaped as to current level.
6. frequency converter Fly a car start control method according to claim 1, is characterized in that, the step of the frequency of the described square wave voltage signal of described calculating comprises:
The frequency that is described square wave voltage signal by the inverse statistics of the time between described square wave voltage signal high level rising edge.
7. frequency converter Fly a car start control method according to claim 1, is characterized in that, also comprises and judges that whether the frequency of described square wave voltage signal is effective.
8. frequency converter Fly a car start control method according to claim 7, is characterized in that, the described whether effective step of frequency that judges square wave voltage signal comprises:
In the time that occurring rising edge mutually first, the two-route wire voltage U V phase of three-phase circuit and UW calculate corresponding frequency and phase place;
In the time that the UV of three-phase circuit has 3 rising edges mutually, UW has 2 rising edges mutually, and described UV phase is less than 400Hz with the frequency in mutually each cycle of described UW;
Frequency UV11, the UV12 of UV phase and the frequency UW11 of described UW phase are stated in calculating, if the deviation between described frequency UV11, UV12 and UW11 be not more than value separately 90% time, think that the frequency of described square wave voltage signal is effective.
9. frequency converter Fly a car start control method according to claim 1, is characterized in that, the described step that described frequency converter is carried out to excitatory processing comprises:
Frequency converter is applied to the speed that frequency is W;
Regulate the rated current of controlling motor by PI;
When detecting the electric current of motor and reaching rated current, by the line voltage of above-mentioned steps sampling frequency converter and judge whether the frequency of the square-wave signal that line voltage after treatment is corresponding is less than 1Hz.
10. frequency converter Fly a car start control method according to claim 9, is characterized in that, the described step that described frequency converter is carried out to excitatory processing also comprises:
Frequency converter is applied to frequency be-speed of W;
Regulate the rated current of controlling motor by PI;
When detecting the electric current of motor and reaching rated current, by the line voltage of above-mentioned steps sampling frequency converter and judge whether the frequency of the square-wave signal that line voltage after treatment is corresponding is less than 1Hz.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410079831.2A CN103916000B (en) | 2014-03-05 | 2014-03-05 | Converter Fly a car start control method |
| PCT/CN2014/092080 WO2015131563A1 (en) | 2014-03-05 | 2014-11-24 | Method for controlling flying start of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410079831.2A CN103916000B (en) | 2014-03-05 | 2014-03-05 | Converter Fly a car start control method |
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| CN103916000A true CN103916000A (en) | 2014-07-09 |
| CN103916000B CN103916000B (en) | 2017-01-04 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015131563A1 (en) * | 2014-03-05 | 2015-09-11 | 深圳市海浦蒙特科技有限公司 | Method for controlling flying start of frequency converter |
| CN106200458A (en) * | 2016-06-29 | 2016-12-07 | 韩伟 | A kind of motor Fly a car start method and system easy to use |
| CN109660179A (en) * | 2018-12-29 | 2019-04-19 | 西安西驰电气股份有限公司 | A kind of fast starting method of frequency converter inspection |
| CN115441802A (en) * | 2022-09-06 | 2022-12-06 | 江苏新安电器股份有限公司 | Software algorithm for detecting and starting motor in forward and reverse wind |
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| WO2015131563A1 (en) * | 2014-03-05 | 2015-09-11 | 深圳市海浦蒙特科技有限公司 | Method for controlling flying start of frequency converter |
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| CN106200458A (en) * | 2016-06-29 | 2016-12-07 | 韩伟 | A kind of motor Fly a car start method and system easy to use |
| CN109660179A (en) * | 2018-12-29 | 2019-04-19 | 西安西驰电气股份有限公司 | A kind of fast starting method of frequency converter inspection |
| CN115441802A (en) * | 2022-09-06 | 2022-12-06 | 江苏新安电器股份有限公司 | Software algorithm for detecting and starting motor in forward and reverse wind |
| CN115441802B (en) * | 2022-09-06 | 2023-12-01 | 江苏新安电器股份有限公司 | Software method for detecting and starting motor in forward and reverse directions |
Also Published As
| Publication number | Publication date |
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| CN103916000B (en) | 2017-01-04 |
| WO2015131563A1 (en) | 2015-09-11 |
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