CN103001569A - Method for tracking no-load rotating speed of high-voltage variable frequency motor - Google Patents
Method for tracking no-load rotating speed of high-voltage variable frequency motor Download PDFInfo
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- CN103001569A CN103001569A CN2012104536964A CN201210453696A CN103001569A CN 103001569 A CN103001569 A CN 103001569A CN 2012104536964 A CN2012104536964 A CN 2012104536964A CN 201210453696 A CN201210453696 A CN 201210453696A CN 103001569 A CN103001569 A CN 103001569A
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Abstract
The invention discloses a method for tracking no-load rotating speed of a high-voltage variable frequency motor. The method includes that a speed sensor is not needed, torque current is detected after scanning voltage is input into the freely-rotating motor, a microprocessor is utilized to calculate power of the motor while current size is controlled, and when the power of the motor converts from a positive value to a zero point of a negative value, detection of rotating speed is thought to be realized. Synchronization of rotating speed of a stator and a rotor is realized through indirectly judging frequency of the rotor. Smooth startup of the high-voltage motor with the rotor under nonstatic condition is realized without using the speed sensor, startup is smooth, algorithm is simple, implementation is easy, and cost increase is not needed.
Description
Technical field
The present invention relates to high-pressure frequency-conversion control technology field, relate in particular to a kind of high-voltage motor frequency-changing control system mesohigh variable-frequency motor idler revolutions tracking that is applied to.
Background technology
The 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 important roles such as technique.In many large-scale motor driving systems, particularly in the 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 the rotation status to the inactive state is from dozens of minutes by several hours.If there is transducer power-down, motor rotates freely and re-powers immediately direct startup often because the excessive over current of motor that causes of torque current, and continuous operation that not only can not finishing equipment also will cause infringement and the loss of equipment.The whole system that will cause out of service of motor stops production in some application scenario, and unexpected shutdown meeting brings immeasurable economic loss to the user.Other pump class application scenario and " industrial frequency-variable frequency " at high voltage converter " drag many " switches occasion, all needs level and smooth start-up technique under the motor free rotation state.
The method that realizes at present this function has multiple: follow the trail of motor if any the method for installation rate transducer on high-voltage motor and rotate freely frequency, pass through the hardware frequency detection method to motor feedback voltage, these methods all need additionally to install speed measuring equipment.For the VVVF control mode of Speedless sensor, the way of search of mentioning rotor frequency in Siemens's application manual has two kinds: a kind of being called " stator is inputted constant VF curve comparison method ".The method possible in theory, but this method is difficult to guarantee accuracy in the practical application.Another kind is called " dc bus minimum current method ".The method theory is feasible, but detects without dc bus current in high voltage transducer power unit, therefore can not adopt the scheme that detects dc bus current indirect detection rotor frequency.
Summary of the invention
The object of the invention is exactly in order to remedy the defective of prior art, a kind of high-pressure frequency-conversion motor idler revolutions to be provided
Tracking.
The present invention is achieved by the following technical solutions:
A kind of high-pressure frequency-conversion motor idler revolutions tracking, when high-voltage motor rotates freely, utilize digital signal processing chip DSP to high-voltage motor input scan voltage, the proportional relation of UF curve when described scanning voltage and high-voltage motor normally move, scanning voltage and scanning frequency are corresponding and change along with the variation of scanning frequency one by one, the output current of sampling high-voltage motor, digital signal processing chip DSP calculates the instantaneous value of third phase according to the biphase current instantaneous value of sampling out, instantaneous value according to three-phase current calculates total current phasor value, and guarantee electric current variation within the scope of setting, digital signal processing chip DSP calculates power of motor under the current scanning frequency according to the instantaneous value of three-phase current, when power of motor by judging then that when changing to the some place, zero boundary of negative value high-voltage motor when idle running frequency is current scanning frequency, progressively be increased to the magnitude of voltage of normal UF curve from scanning voltage at this scanning frequency voltage of naming a person for a particular job, take the voltage of normal UF curve as target, frequency converter output voltage is raise progressively is so that the level and smooth startup of high-voltage motor.
The excursion of described scanning frequency is for being decremented to 0HZ with the 0.5HZ step-length from+50HZ, be incremented to 0HZ by-50HZ with the 0.5HZ step-length again.
Advantage of the present invention is: the present invention does not need the operating speed transducer, realizes the level and smooth startup of high-voltage motor under the rotor non-stationary conditions, starts steadily, and algorithm is simple, is easy to realize, need not increase cost.
Description of drawings
Fig. 1 is software flow pattern of the present invention.
Fig. 2 is the UF curve of high-voltage motor.
Embodiment
As shown in Figure 1, a kind of high-pressure frequency-conversion motor idler revolutions tracking, when high-voltage motor rotates freely, utilize digital signal processing chip DSP to high-voltage motor input scan voltage, the proportional relation of UF curve when described scanning voltage and high-voltage motor normally move, scanning voltage and scanning frequency are corresponding and change along with the variation of scanning frequency one by one, the UF curve as shown in Figure 2, the output current of sampling high-voltage motor, digital signal processing chip DSP calculates the instantaneous value of third phase according to the biphase current instantaneous value of sampling out, instantaneous value according to three-phase current calculates total current phasor value, and guarantee electric current variation within the scope of setting, digital signal processing chip DSP calculates power of motor under the current scanning frequency according to the instantaneous value of three-phase current, when power of motor by judging then that when changing to the some place, zero boundary of negative value high-voltage motor when idle running frequency is current scanning frequency, progressively be increased to the magnitude of voltage of normal UF curve from scanning voltage at this scanning frequency voltage of naming a person for a particular job, take the voltage of normal UF curve as target, frequency converter output voltage is raise progressively is so that the level and smooth startup of high-voltage motor.
The excursion of described scanning frequency is for being decremented to 0HZ with the 0.5HZ step-length from+50HZ, be incremented to 0HZ by-50HZ with the 0.5HZ step-length again.
Because when high voltage motor stator rotating magnetic field speed is lower than spinner velocity, high-voltage motor is generating state, high-voltage motor rotor will charge to capacitor of frequency converter to the anti-energy that send of stator side, make the overvoltage of capacitor of frequency converter voltage pump rise, so search procedure must be from being higher than the high-voltage motor rotor frequency, consider that all possibilities begin scanning from the+initial high voltage converter of 50HZ to the motor that rotates freely, if directly will export " full scale " voltage according to the UF curve of the normal operation of high-voltage motor, this just is similar to " full voltage starting ", and electric current and torque shock ends are very big.Therefore to get 5% ~ 20% output of full scale be to determine the corresponding scanning voltage of each scanning frequency behind the scaled UF curve magnitude of voltage to voltage.Because when the general high voltage motor rotates freely, be equivalent to generator, can measure at motor output end the voltage of tens volts of sizes, the so lower scanning voltage input motor of this magnitude of voltage can not affect rotating freely of motor and so that frequency converter current of electric sample circuit can monitor the variation waveform of current of electric.The variation tendency of scanning frequency is for progressively reducing frequency to 0HZ from+50HZ first, progressively scanning 0HZ from-50HZ, in the excursion of this scanning frequency with 0.5HZ as the search change step.Again according to the judgement of following condition as the free rotating speed point of motor.At first, the instantaneous value of every sample rate current is advanced vector calculate, and will be worth and the scope of setting is made comparisons, only have current phasor namely to represent to carry out again power calculation when steady when front motor rotates freely less than this scope.Current of electric instantaneous value by sampling can accurately calculate when the front motor operate power, this performance number is that timing shows that motor is in generating state, when power of motor thinks that then frequency converter is in motoring condition to the power input to machine motor when negative, thus get power by on the occasion of to the some place, zero boundary of negative value for tracking to get the rotating speed point.Begin the frequency converter output voltage that raises from this point, until voltage rises to normal UF curve.And then accelerate according to target frequency, finally realize smoothly restarting of the motor that rotates freely.
Claims (2)
1. high-pressure frequency-conversion motor idler revolutions tracking, it is characterized in that: when high-voltage motor rotates freely, utilize digital signal processing chip DSP to high-voltage motor input scan voltage, the proportional relation of UF curve when described scanning voltage and high-voltage motor normally move, scanning voltage and scanning frequency are corresponding and change along with the variation of scanning frequency one by one, the output current of sampling high-voltage motor, digital signal processing chip DSP calculates the instantaneous value of third phase according to the biphase current instantaneous value of sampling out, instantaneous value according to three-phase current calculates total current phasor value, and guarantee electric current variation within the scope of setting, digital signal processing chip DSP calculates power of motor under the current scanning frequency according to the instantaneous value of three-phase current, when power of motor by judging then that when changing to the some place, zero boundary of negative value high-voltage motor when idle running frequency is current scanning frequency, progressively be increased to the magnitude of voltage of normal UF curve from scanning voltage at this scanning frequency voltage of naming a person for a particular job, take the voltage of normal UF curve as target, frequency converter output voltage is raise progressively is so that the level and smooth startup of high-voltage motor.
2. high-pressure frequency-conversion motor idler revolutions tracking according to claim 1 is characterized in that: the excursion of described scanning frequency is for being decremented to 0HZ with the 0.5HZ step-length from+50HZ, is incremented to 0HZ by-50HZ with the 0.5HZ step-length again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210453696.4A CN103001569B (en) | 2012-11-13 | 2012-11-13 | High-pressure frequency-conversion motor idler revolutions tracking |
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| CN201210453696.4A CN103001569B (en) | 2012-11-13 | 2012-11-13 | High-pressure frequency-conversion motor idler revolutions tracking |
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| CN103001569B CN103001569B (en) | 2015-10-07 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113259A (en) * | 2014-07-29 | 2014-10-22 | 深圳市步科电气有限公司 | Motor rotating speed tracking method and device of frequency converter |
| CN108075707A (en) * | 2017-11-16 | 2018-05-25 | 中冶南方（武汉）自动化有限公司 | Based on the asynchronous machine Restart Method and system under V/f control models |
| CN112491310A (en) * | 2020-11-23 | 2021-03-12 | 北京信息科技大学 | Sensorless starting method of brushless direct current motor with large-inertia rotor |
| CN112713842A (en) * | 2020-12-19 | 2021-04-27 | 中冶南方（武汉）自动化有限公司 | Method for preventing low-frequency overcurrent in rotating speed tracking of asynchronous motor |
| CN114389503A (en) * | 2021-12-20 | 2022-04-22 | 华中科技大学 | Initial speed identification and belt speed re-throwing control method and device for asynchronous motor |
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| JP2007166695A (en) * | 2005-12-09 | 2007-06-28 | Hitachi Appliances Inc | Control device of motor |
| CN101098122A (en) * | 2006-06-28 | 2008-01-02 | 北京利德华福电气技术有限公司 | Method for driving synchronous machine to operation using power source type frequency converter |
| CN101771372A (en) * | 2008-12-29 | 2010-07-07 | 襄樊创新源电气有限公司 | Method for driving starting of rotary motor by high-voltage transducer |
| EP2273665A2 (en) * | 2009-07-09 | 2011-01-12 | Hitachi, Ltd. | Control unit and control method for permanent magnet synchronous motor |
| CN102299679A (en) * | 2011-08-30 | 2011-12-28 | 中冶南方（武汉）自动化有限公司 | Method for determining rotating speed of restarted asynchronous motor |
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2012
- 2012-11-13 CN CN201210453696.4A patent/CN103001569B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007166695A (en) * | 2005-12-09 | 2007-06-28 | Hitachi Appliances Inc | Control device of motor |
| CN101098122A (en) * | 2006-06-28 | 2008-01-02 | 北京利德华福电气技术有限公司 | Method for driving synchronous machine to operation using power source type frequency converter |
| CN101771372A (en) * | 2008-12-29 | 2010-07-07 | 襄樊创新源电气有限公司 | Method for driving starting of rotary motor by high-voltage transducer |
| EP2273665A2 (en) * | 2009-07-09 | 2011-01-12 | Hitachi, Ltd. | Control unit and control method for permanent magnet synchronous motor |
| CN102299679A (en) * | 2011-08-30 | 2011-12-28 | 中冶南方（武汉）自动化有限公司 | Method for determining rotating speed of restarted asynchronous motor |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113259A (en) * | 2014-07-29 | 2014-10-22 | 深圳市步科电气有限公司 | Motor rotating speed tracking method and device of frequency converter |
| CN104113259B (en) * | 2014-07-29 | 2017-03-29 | 深圳市步科电气有限公司 | A kind of converter follows the trail of the method and its device of motor speed |
| CN108075707A (en) * | 2017-11-16 | 2018-05-25 | 中冶南方（武汉）自动化有限公司 | Based on the asynchronous machine Restart Method and system under V/f control models |
| CN108075707B (en) * | 2017-11-16 | 2021-02-02 | 中冶南方（武汉）自动化有限公司 | Asynchronous motor restarting method and system based on V/f control mode |
| CN112491310A (en) * | 2020-11-23 | 2021-03-12 | 北京信息科技大学 | Sensorless starting method of brushless direct current motor with large-inertia rotor |
| CN112491310B (en) * | 2020-11-23 | 2022-06-17 | 北京信息科技大学 | Sensorless starting method of brushless direct current motor with large-inertia rotor |
| CN112713842A (en) * | 2020-12-19 | 2021-04-27 | 中冶南方（武汉）自动化有限公司 | Method for preventing low-frequency overcurrent in rotating speed tracking of asynchronous motor |
| CN114389503A (en) * | 2021-12-20 | 2022-04-22 | 华中科技大学 | Initial speed identification and belt speed re-throwing control method and device for asynchronous motor |
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| CN103001569B (en) | 2015-10-07 |
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