CN102291081A - Method for tracking dynamic load of frequency converter - Google Patents
Method for tracking dynamic load of frequency converter Download PDFInfo
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- CN102291081A CN102291081A CN2010102023194A CN201010202319A CN102291081A CN 102291081 A CN102291081 A CN 102291081A CN 2010102023194 A CN2010102023194 A CN 2010102023194A CN 201010202319 A CN201010202319 A CN 201010202319A CN 102291081 A CN102291081 A CN 102291081A
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- 230000000694 effects Effects 0.000 abstract description 6
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- 238000003754 machining Methods 0.000 abstract description 3
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Abstract
The invention provides a method for tracking a dynamic load of a frequency converter. The method comprises the following steps of: 1. detecting an actual work current of a motor; 2. calculating an output voltage of the frequency converter according to the actual work current and output frequency, wherein the calculating formula is showed as the attached figure; and 3. adjusting the output voltage of the frequency converter according to the calculation result. The method disclosed by the invention has the advantages of fast load tracking speed and implementation of dynamic tracking and can be applied to energy conversation of situations with fast load power changes, and the method can be used in cranes, wind turbines, water pumps, punching machines, mechanical machining devices (such as grinding machines, lathes, milling machines, planning machines, and the like.). Compared with a common frequency converter, under the work condition of a power frequency state, if the actual load is smaller than the rated load, more than 90% of the smaller part can be omitted. Under the condition of a 50HZ frequency, and the motor is under an idle load condition proved by an experiment, the voltage of the motor can be reduced 50%, and the current can be reduced 30%, therefore, the actual power is reduced and the power factor is improved. Under a non-power frequency state, a remarkable energy conversation effect can be obtained on any frequencies with more than 10HZ.
Description
Technical field
The present invention relates to the method that a kind of frequency converter dynamic load is followed the tracks of.
Background technology
Frequency converter scalable rotating speed of motor is energy-conservation as everybody knows.Be that the energy-conservation middle energy-saving effect of all speed regualtion of AC motor is best.But the regrettably frequency converter of selling on the society now can only be realized energy-conservationly below power frequency, has not but had power saving function under the power frequency state.Even also to consume energy more.And must operate under the power frequency state at many occasion motors.。The energy-conservation aspect of the frequency converter of staircase for example.Present also have a staircase that frequency converter has been installed.Its technical scheme is under unmanned situation speed to be reduced, and realizes energy-conservation.Its weak point is: can't distinguish loading condition, no matter people of load perhaps under many people's the situation, will be operated under the same power frequency state, and the power factor of motor is very low when having only less people's using escalator, so its energy-saving effect is obvious inadequately.And the prior art scheme can not obtain energy-conservation effect in the use of the bigger or more frequent crane of load variations, blower fan, water pump, machining equipment (as grinding machine, lathe, milling machine, planer etc.).
Summary of the invention
The method that the object of the present invention is to provide a kind of frequency converter dynamic load to follow the tracks of, thus can under the bigger or more frequent situation of load variations, realize remarkable energy saving effect.
The method that frequency converter dynamic load of the present invention is followed the tracks of comprises following content:
1, detects motor real work electric current;
2, according to real work electric current and output frequency, calculate frequency converter output voltage (being the operating voltage of motor), computing formula is:
Wherein:
Uz: be the motor minimum voltage
U: the voltage of frequency converter output
Ue: the rated voltage of motor
I0: the electric current during for the motor zero load
I: the electric current during for the motor real work
Ie: the rated current of motor
3, adjust frequency converter output voltage according to result of calculation.
Its operation principle is: when load was light, motor working current was less than rated current, and its operating voltage can be less than rated voltage, and does not influence rotating speed of motor, can improve power factor simultaneously.
The invention has the advantages that: load tracking speed is fast and can realize dynamic tracking, can be applicable to bearing power and changes the energy-conservation of fast occasion.At crane, blower fan, water pump, punch press all can be used in the machining equipment (as grinding machine, lathe, milling machine, planer etc.).
The method by and the contrast of common frequency converter, under power frequency state working condition, if actual loading less than the volume load, its less than part can save more than 90%.
Under the power frequency of 50HZ, experimental results show that the voltage of motor can reduce by 50% under motor is in no-load condition, electric current reduces by 30%.Not only reduce apparent power and also improved power factor.Under non-power frequency state, all can obtain remarkable energy saving effect on any frequency more than the 10HZ.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further.
Description of drawings
Fig. 1 is; Principle schematic of the present invention
Embodiment
Embodiment one: referring to accompanying drawing 1, the method that a kind of frequency converter dynamic load is followed the tracks of comprises:
1, import rated current, the no-load current of motor by man-machine interface, and Uz: motor minimum voltage, Ue: the rated voltage of motor.
2, utilize Hall unit or linear light idol to detect the electric current that frequency converter is exported respectively, obtain the voltage analog signal of corresponding 0-± 4V;
3, above-mentioned each voltage analog signal is delivered to level shift circuit, be converted into the 0-3.3V voltage analog signal, deliver to the analog quantity input of DSP, finish the A/D conversion, obtain the current parameters of digital form by DSP.
4, according to rated current, no-load current and the real work current signal of motor, calculate the energy conservation voltage of optimal motor by DSP, computing formula is:
Adopt the DSP2808 of TI to realize above-mentioned algorithm in the present embodiment, because 32 TI DSP2808 has 1,000,000 times/S of operational capability at a high speed, the application of algorithm provides guarantee for this reason, thereby realized the quick tracking of output voltage, output voltage can reach 200ms to the tracking velocity of load current, goes for fully in the frequent environment of various load variations.
5, according to result of calculation, change the PWM waveform of frequency converter, adjust frequency converter output voltage.
Because motor needs bigger energy when quickening, for guaranteeing rapid acceleration.Can control at first test frequency converter's frequency change situation by DSP or CPU, cancellation automatic load following function when quickening.When reaching stable state, speed enters the load tracking state immediately.
As: the threephase asynchronous machine of a 7.5KW, under certain operating state, its rated current is 18A, and the real work active current is 9A, and rated voltage is 380V.As not adding its active power of energy-conservation algorithm is 5824W.
If its minimum is 130V, no-load current is 1.8A, and according to the method described in the present invention it is carried out load tracking, then according to formula:
Frequency converter is by adjusting the PWM waveform, and the adjustment frequency converter output voltage is 289V, and this moment, the measured current of this motor was 8.9A.Power output=apparent power=289*8.9*1.7=2572W*1.7=4372W of this moment calculates active power for reducing 5824-4372/5824=24.9% by measured data.
Embodiment two: referring to accompanying drawing 1, a kind of embodiment of utilizing frequency converter to realize load tracking may further comprise the steps:
1, utilizes Hall unit or linear light idol to detect the electric current that frequency converter is exported respectively, obtain the voltage analog signal of corresponding 0-± 4V.
2, above-mentioned each voltage analog signal is delivered to the current parameters that A/D converter is converted to digital form and sent into CPU.
3, CPU calculates the energy conservation voltage of optimal motor, and computing formula is:
4, according to result of calculation, change the PWM waveform of frequency converter, adjust frequency converter output voltage.
Claims (2)
1. the frequency converter dynamic load method of following the tracks of is characterized in that comprising following content:
A, detection motor real work electric current;
B, according to real work electric current and output frequency, calculate frequency converter output voltage (being the operating voltage of motor), computing formula is:
C, adjust frequency converter output voltage according to result of calculation.
2. the method that frequency converter dynamic load as claimed in claim 1 is followed the tracks of is characterized in that: adopt DSP2808 or the common CP U of TI, DSP realizes related algorithm and control.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102023194A CN102291081A (en) | 2010-06-18 | 2010-06-18 | Method for tracking dynamic load of frequency converter |
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| CN2010102023194A CN102291081A (en) | 2010-06-18 | 2010-06-18 | Method for tracking dynamic load of frequency converter |
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| CN102291081A true CN102291081A (en) | 2011-12-21 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487313A (en) * | 2015-09-02 | 2017-03-08 | 东元电机股份有限公司 | Frequency conversion servo system and real-time power distribution method thereof |
| CN110422744A (en) * | 2019-08-15 | 2019-11-08 | 康力电梯股份有限公司 | A kind of display methods of staircase or moving sidewalk load curve |
| CN110762794A (en) * | 2019-10-31 | 2020-02-07 | 广东美的制冷设备有限公司 | Power supply voltage determining method and device, compressor and air conditioner |
| CN113097974A (en) * | 2020-01-08 | 2021-07-09 | 上海松井机械有限公司 | Disintegrating machine |
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| CN1302983A (en) * | 2000-01-06 | 2001-07-11 | 鲍献忠 | Dynamic throttle unit |
| CN1545197A (en) * | 2003-07-29 | 2004-11-10 | 北京利德华福电气技术有限公司 | Full digitalized vector control type high-voltage large-power frequency converter based on DSP chip |
| CN101383588A (en) * | 2007-09-07 | 2009-03-11 | 深圳市汇川技术股份有限公司 | Method and device for frequency converter to track motor speed |
| CN201215099Y (en) * | 2008-04-09 | 2009-04-01 | 明大动力(北京)能源科技有限公司 | Intelligent efficacy energy-conserving end device for blower fan water pump |
-
2010
- 2010-06-18 CN CN2010102023194A patent/CN102291081A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| CN1302983A (en) * | 2000-01-06 | 2001-07-11 | 鲍献忠 | Dynamic throttle unit |
| CN1545197A (en) * | 2003-07-29 | 2004-11-10 | 北京利德华福电气技术有限公司 | Full digitalized vector control type high-voltage large-power frequency converter based on DSP chip |
| CN101383588A (en) * | 2007-09-07 | 2009-03-11 | 深圳市汇川技术股份有限公司 | Method and device for frequency converter to track motor speed |
| CN201215099Y (en) * | 2008-04-09 | 2009-04-01 | 明大动力(北京)能源科技有限公司 | Intelligent efficacy energy-conserving end device for blower fan water pump |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487313A (en) * | 2015-09-02 | 2017-03-08 | 东元电机股份有限公司 | Frequency conversion servo system and real-time power distribution method thereof |
| CN106487313B (en) * | 2015-09-02 | 2018-09-14 | 东元电机股份有限公司 | Frequency conversion servo system and real-time power distribution method thereof |
| CN110422744A (en) * | 2019-08-15 | 2019-11-08 | 康力电梯股份有限公司 | A kind of display methods of staircase or moving sidewalk load curve |
| CN110422744B (en) * | 2019-08-15 | 2020-08-25 | 康力电梯股份有限公司 | Method for displaying load curve of escalator or moving sidewalk |
| CN110762794A (en) * | 2019-10-31 | 2020-02-07 | 广东美的制冷设备有限公司 | Power supply voltage determining method and device, compressor and air conditioner |
| CN110762794B (en) * | 2019-10-31 | 2021-07-20 | 广东美的制冷设备有限公司 | Power supply voltage determining method and device, compressor and air conditioner |
| CN113097974A (en) * | 2020-01-08 | 2021-07-09 | 上海松井机械有限公司 | Disintegrating machine |
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