CN104753400B - A kind of high-voltage asynchronous motor frequency conversion soft start method - Google Patents
A kind of high-voltage asynchronous motor frequency conversion soft start method Download PDFInfo
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- CN104753400B CN104753400B CN201510194646.2A CN201510194646A CN104753400B CN 104753400 B CN104753400 B CN 104753400B CN 201510194646 A CN201510194646 A CN 201510194646A CN 104753400 B CN104753400 B CN 104753400B
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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
- H02P1/30—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 by progressive increase of frequency of supply to primary circuit of motor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Motor And Converter Starters (AREA)
Abstract
The invention discloses a kind of high-voltage asynchronous motor frequency conversion soft start method, asynchronous machine starts from default generator rotor angle frequency, high voltage converter output voltage rises curve boosting from 0V by voltage is slow, boost to after the corresponding voltage of default generator rotor angle frequency, normal V/F controls are transferred to, the smooth starting of high-voltage asynchronous motor is realized.The present invention greatly improves the current waveform of high voltage converter start-up course, and starting current is improved to sinusoidal wave from clutter, and the power cell configured using same hardware can drive the motor of more high current grade.
Description
Technical field
The present invention relates to a kind of high-voltage asynchronous motor frequency conversion soft start method, more particularly to a kind of height of use V/F technologies
The high-voltage asynchronous motor soft-start method of voltage variable frequency speed regulating device, belongs to Medium Voltage Variable Frequency Speed Regulation Technology field.
Background technology
Using the high-voltage frequency conversion and speed-adjusting device of V/F control technologies, usual starting frequency is between 0Hz-1Hz, but due to V/F
Control belongs to opened loop control, it is impossible to which the rotating speed of high-voltage asynchronous motor is monitored, when in asynchronous machine from static to rotation
During, because the stiction and kinetic force of friction of asynchronous machine differ greatly, when the rotor for overcoming the quiet power of rubbing to rotate, low dynamic
Higher accelerations are produced in the presence of frictional force so that the speed of asynchronous machine rotor can exceed the synchronous field rotating speed of stator,
The revolutional slip of asynchronous machine is constantly fluctuated between positive and negative, causes generator rotor angle constantly to fluctuate, and is caused above and below asynchronous machine starting current
Fluctuation, causes starting current waveform disorderly and unsystematic.
When being run using the V/F high voltage frequency converters controlled in ultralow frequency, because the speed of rotor is very low, make asynchronous height
It is defeated when rotor magnetic pole with magnetic pole of the stator to timing when voltage motor rotor speed is not up to the plateau that moment of inertia is formed
Go out drawing torque big, accelerate the speed of rotor, and magnetic pole is to timing, spinner velocity is slack-off, so that rotor exists
The rotating speed of one circumference is sometimes fast and sometimes slow so that the revolutional slip of asynchronous machine is fluctuated between positive and negative, causes generator rotor angle between positive and negative
Constantly fluctuation, makes asynchronous high-voltage motor be fluctuated back and forth between the state done work and generated electricity, so as to cause V/F to control high-pressure frequency-conversion dress
The output current put produces larger momentary fluctuation so that high voltage frequency converter starts the unordered impact that electric current can all occur every time
Process, has a strong impact on the life-span of the elements such as IGBT in high voltage frequency converter.
The content of the invention
In order to solve the above-mentioned technical problem, the present invention provides a kind of soft-start method of high voltage frequency converter, and its is specific
Step is as follows：
1）Default generator rotor angle frequency is calculated according to the number of pole-pairs of high-voltage asynchronous motor；
2）The curve acceleration time of its torque current is calculated according to the rated power of high asynchronous machine, when the curve accelerates
Between both be high-voltage asynchronous motor soft-start time；
3）High voltage frequency converter drags high-voltage asynchronous motor soft start, and the default generator rotor angle frequency of high voltage frequency converter output is defeated
Go out voltage and slowly boost to the corresponding voltage of default generator rotor angle frequency from zero, soft-start time is controlled after terminating according to normal V/F
System.
This method starts generator rotor angle according to non-synchronous motor parameter is default on startup, improves revolutional slip, starts asynchronous machine
When ensure generator rotor angle be always on the occasion of, realize asynchronous machine when ultralow frequency is run all the time be in acting state, realize use V/F skills
The high voltage frequency converter of art electric current in asynchronous machine start-up course is steady, and frequency and voltage are not according to V/ in soft start-up process
F regulations, after soft start terminates, control is adjusted according to V/F in frequency and voltage.This method avoids most intractable ultralow
Frequency part, in the case where not increasing hardware cost, is substantially improved the load capacity of high voltage converter, reduces start-up course to height
The rush of current of Medium-voltage Motor and high voltage frequency converter.
The beneficial effects of the invention are as follows：It can relatively show that the present invention greatly improves height by Fig. 1 and Fig. 2 recording figure
Starting current, is improved to sinusoidal wave from clutter, is configured using same hardware by the current waveform of voltage frequency changer start-up course
Power cell, can drive the motor of more high current grade.
Brief description of the drawings
Fig. 1 directly plays the recording figure of process for the frequency conversion of prior art；
Fig. 2 is the soft recording figure for opening process of frequency conversion of the invention；
Fig. 3 is the flow chart that input parameter of the present invention is calculated；
Fig. 4 is hardware platform frame diagram of the invention；
Fig. 5 opens process frequency, voltage change schematic diagram for the present invention is soft；
Fig. 6 is revolutional slip change schematic diagram of the present invention.
Embodiment
The step of soft-start method, is specific as follows：
1）Default generator rotor angle frequency is automatically generated according to the number of pole-pairs of motor.Asynchronous machine rotor reaches the speed of steady inertia
Close, but the number of pole-pairs of motor is different, the speed difference limit of identical frequency driving rotor is big, be different numbers of poles asynchronous machine and
The different default generator rotor angle frequency of setting, the requirement for device operator is higher, therefore is the target for reaching versatility, using motor
Number of pole-pairs parameter on nameplate carry out it is internal it is automatic calculate, as long as user is by motor nameplate parameter typing, you can complete default
The setting of generator rotor angle frequency, greatly reduces the work difficulty of operating personnel and the generation of parameter setting mistake.
2）Soft-start time is automatically generated according to the rated power of asynchronous machine.The power of asynchronous motor is bigger, then electric
The rotor quality of machine is higher, it is ensured that torque current is not excessive in start-up course, then the time of voltage climb curve is longer,
By the performance number on the nameplate of asynchronous machine, the curve acceleration time of its torque current is calculated.
3）In high voltage frequency converter dragging high-voltage motor start-up course, high voltage frequency converter exports default generator rotor angle frequency
Rate, voltage is risen by the slow curve that rises of voltage, and the raising output torque for making asynchronous high-voltage motor stable in the state of positive generator rotor angle makes
Asynchronous high-voltage motor rotor speed makes asynchronous high-voltage motor under the driving of stable electric current from static lifting to inertia stabilized speed
Complete start rotary course, the soft time of opening terminate after be controlled according to normal V/F.
Below using 1250KW, 2 pole 10KV motors as example, high-voltage asynchronous motor frequency conversion soft start method is made specifically
It is bright.
As shown in figure 3, calculating 1250KW, 2 poles according to the input parameter of motor, the default generator rotor angle frequency of 10KV motors is
3.5Hz, it is 32 seconds to calculate the slow plot against time that rises of soft start voltage.When default generator rotor angle frequency is 3.5Hz, Rated motor voltage is
During 10KV, its soft complement mark that opens reaches 0.7KV for voltage output, and the time reaches 32 seconds.
In the process, different from the regulative mode of normal frequency modulation and voltage modulation curve, and completely self-contained regulation subsystem is used
System, output frequency is controlled with voltage decoupling.Kept for the cycle of modulating wave constant, and calculate this frequency correspondence under normal V/F
Dutyfactor value（Standard dutycycle）, then according to certain speed increase modulation wave amplitude, improve the output duty cycle of frequency converter.
Ceaselessly compare whether this dutyfactor value reaches standard dutyfactor value in the process, if reaching standard dutyfactor value, move back
Go out Soft Start-up Process, into normal frequency modulation and voltage modulation process.
As shown in figure 4, hardware platform uses TMS320F2812DSP digital processing chips, parameter setting is made using touch-screen
For user-machine interface.Soft-start module receives the nameplate parameter of motor from touch-screen, by interior in DSP internal operations
The computing in portion produces related parameter, is output to the power frequency conversion system of high voltage converter by optical fibre driver in the completed,
High voltage converter is completed to work to soft.When high voltage converter is in halted state, receive after enabled instruction,
Mainboard DSP programs calculate the frequency and amplitude of modulating wave, passed in real time by data/address bus according to soft start frequency Setting signal
In the defeated fpga chip to mainboard；In FPGA programs, modulation wave signal and the fixed triangle carrier wave produced in itself by FPGA（Adopt
Use and there are different phase shift angles between phase-shifting carrier wave modulation system, the carrier signal of each unit）After obtain PWM arteries and veins
Rush waveform.This impulse waveform is transferred to three-phase optical fiber plate by bus board, is then transferred to each power list by optical-fibre communications
Member.Power cell CPLD chips are received after pwm signal, and by docking the regression analysis of the collection of letters number, control signal is output to
Driving plate, completes to open IGBT the control of shut-off, so as to reduce modulating wave waveform, reaches any control waveform being converted into reality
The purpose of border high tension voltage output.
High voltage converter output frequency is according to 1250KW, 2 poles, the default generator rotor angle frequency 3.5Hz outputs of 10KV motors, PWM
Dutycycle rises slope adjustment so that the voltage of 32 seconds durations is slow.It is constant for 3.5Hz in rate-adaptive pacemaker for high-voltage motor driving
In the case of, the amplitude of frequency converter output voltage is steadily delayed from 0V to be risen.
As shown in Figure 5 and Figure 6, during the rotor of high-voltage motor is from static to the running of 3.5Hz frequencies, its generator rotor angle is
Just, while slow liter of the voltage from zero to 0.7KV, makes the driving current of motor be in a stable curve state, with less
Rotary inertia acceleration has reached inertia stabilized speed, now frequency operation 3.5Hz, output voltage 0.7KV, that is, reaches 10KV systems
Normal voltage-frequency of uniting voltage magnitude more corresponding than curve, V/F is converted to than control mode by the soft control mode unperturbed opened, complete
The process turned is smoothly acted into motor.
In the whole frequency-modulating process of high voltage converter, soft part of opening is divided into by critical point of default generator rotor angle frequency and is adjusted with normal
The regulation of fast part, i.e. soft start partly and according to V/F adjusts part.
In this example, the high-voltage motor that high voltage converter is directly initiated electric current under 3Hz has larger impact and fluctuation,
And current waveform harmonic wave is greatly, noise of motor is larger.And the soft high-voltage motor for opening mode is used, electric current is by small in start-up course
To big steady rising, and waveform is sinusoidal wave, and electric current does not impact substantially, and sound is steady during electric motor starting.So as to frequent
The high voltage converter and the life-span of high-voltage motor worked in the case of startup using soft dynamic model formula will be greater than directly initiating under pattern
The high voltage converter and high-voltage motor of work.
Claims (1)
1. a kind of high-voltage asynchronous motor frequency conversion soft start method, it is characterised in that specific step is as follows：
1）Default generator rotor angle frequency is calculated according to the number of pole-pairs of high-voltage asynchronous motor, specific method is：Using on motor nameplate
Number of pole-pairs parameter carries out internal automatic calculating, you can complete the setting of default generator rotor angle frequency；
2）The curve acceleration time of its torque current is calculated according to the rated power of high-voltage asynchronous motor, the curve acceleration time
The as soft-start time of high-voltage asynchronous motor；
3）High voltage frequency converter drags high-voltage asynchronous motor soft start, the default generator rotor angle frequency of high voltage frequency converter output, output electricity
Pressure slowly boosts to the corresponding voltage of default generator rotor angle frequency from zero, and soft-start time is controlled after terminating according to normal V/F.
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| CN201510194646.2A CN104753400B (en) | 2015-04-23 | 2015-04-23 | A kind of high-voltage asynchronous motor frequency conversion soft start method |
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| CN201510194646.2A CN104753400B (en) | 2015-04-23 | 2015-04-23 | A kind of high-voltage asynchronous motor frequency conversion soft start method |
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| CN104753400B true CN104753400B (en) | 2017-09-26 |
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| CN107872172B (en) * | 2017-10-09 | 2020-10-23 | 广东明阳龙源电力电子有限公司 | A method of starting a closed-loop and V/F-controlled motor under MMC inverter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5237242A (en) * | 1990-12-30 | 1993-08-17 | Toshiba Lighting And Technology Corporation | Apparatus for operating a discharge lamp and a lighting unit having the apparatus |
| CN1599230A (en) * | 2004-07-28 | 2005-03-23 | 哈尔滨工业大学 | Discrete variable frequency starting system of AC induction motor and starting method |
| CN1808881A (en) * | 2005-01-18 | 2006-07-26 | 徐甫荣 | High torque soft starter with graded AC-AC frequency conversion method |
| 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 |
| CN103546088A (en) * | 2012-07-13 | 2014-01-29 | 安川电机（中国）有限公司 | Motor rotation speed control device and method |
-
2015
- 2015-04-23 CN CN201510194646.2A patent/CN104753400B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5237242A (en) * | 1990-12-30 | 1993-08-17 | Toshiba Lighting And Technology Corporation | Apparatus for operating a discharge lamp and a lighting unit having the apparatus |
| CN1599230A (en) * | 2004-07-28 | 2005-03-23 | 哈尔滨工业大学 | Discrete variable frequency starting system of AC induction motor and starting method |
| CN1808881A (en) * | 2005-01-18 | 2006-07-26 | 徐甫荣 | High torque soft starter with graded AC-AC frequency conversion method |
| 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 |
| CN103546088A (en) * | 2012-07-13 | 2014-01-29 | 安川电机（中国）有限公司 | Motor rotation speed control device and method |
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Inventor after: Liu Shuyu Inventor after: Guo Zhaojing Inventor after: Liu Zhaojuan Inventor after: Li Wanwei Inventor after: Wang Yue Inventor after: Liu Yu Inventor after: Li Kai Inventor before: Li Kai Inventor before: Liu Yu Inventor before: Liu Zhaojuan |
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