CN106533320A - Frequency converter safety current automatic control method - Google Patents
Frequency converter safety current automatic control method Download PDFInfo
- Publication number
- CN106533320A CN106533320A CN201610934418.9A CN201610934418A CN106533320A CN 106533320 A CN106533320 A CN 106533320A CN 201610934418 A CN201610934418 A CN 201610934418A CN 106533320 A CN106533320 A CN 106533320A
- Authority
- CN
- China
- Prior art keywords
- current
- frequency
- actual output
- safe
- converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention relates to the technical field of frequency converters, and discloses a frequency converter safety current automatic control method. The method comprises steps: S1, a safety current range and a safety current automatic operation frequency range are set; S2, the actual frequency converter output current is compared with the safety current range; S3, when the actual output current reaches the upper limit of the safety current range, a command of frequency reduction and motor rotation speed reduction is sent to the frequency converter, the actual output current is reduced, the actual output current is kept to be constantly in the safety current range, and if the frequency is reduced to the preset safety current automatic operation frequency range value and if the current continuously exceeds the safety current range, fault protection measures are taken, and processing is carried out according to a preset fault protection function; and S4, if the actual output current reaches the lower limit of the set safety current range, a command of frequency increasing and motor rotation speed increasing is sent to the frequency converter, and the actual output current is kept to be constantly in the safety current range. The method of the invention can protect equipment from being damaged and serves as a normal and automatic operation function application.
Description
Technical field
The present invention relates to converter field, more particularly to a kind of converter safe current autocontrol method.
Background technology
Frequency Conversion and Speed Regulation Technique is, using advanced intelligent control technology widely, to bear as control fluid currently
The pump class of load and Fan Devices, it is just very convenient efficient using variable-frequency governor.Due to the nature feature of fluid load,
In order to ensure reliable deliverability, people select the lift ability typically above actual lift in scene of pump apparatus high
Degree, actual lift once less than equipment actual lift ability certain limit when or traffic demand or reality output beyond equipment volume
Determine fan-out capability, actual output current and the power of equipment can exceed the rated value of equipment, just occur that apparatus overload, electric current surpass
Height, has the risk for burning motor.
In existing frequency conversion control technique, when transshipping occurs in equipment, the output current increase of converter can exceed equipment
Rated current.For protection equipment, when output current exceedes the rated current certain proportion of equipment, converter is subtracted by frequency reducing
Small current is exported.But reduction frequency quantity is not limited, as long as that is, higher position ceaselessly frequency reducing is still crossed in load, until the equipment of being down to
Below rated current, only as defencive function, not as a kind of AutoPlay function.But frequency is down to the machinery of too low equipment
Performance, for example：As frequency is reduced, motor speed can be reduced, and for can also reduce to the rotation speed of the fan of equipment cooling, radiating becomes
Difference, can cause equipment to burn out.Frequency is too low to also result in meaningless task, such as：Flow, pressure or the temperature of needs are not reached
Output.I.e. prior art only considered the restriction to rated current, without one safety frequency scope of setting.
The content of the invention
The present invention proposes a kind of safe safe current autocontrol method of variable-frequency speed-regulating controller, solves in prior art
Frequency reducing is too low to be caused device damage or carries out the work without practical significance and cannot be used as one only as failure protection function
Plant the problem of normal AutoPlay function application.
A kind of converter rated current autocontrol method for fluid load of the present invention, including step：
S1：Safe current scope and safe current automatic running frequency range are set；
S2：Converter actual output current is compared with safe current scope；
S3：When the actual output current reaches the upper limit of the safe current scope, frequency reducing rate is sent to converter
Subtract the order of motor speed, reduce actual output current, and keep actual output current to be constantly in the range of safe current, if
When frequency is reduced to preset security electric current automatic running frequency range values, and continue to make if safe current scope if electric current
Error protection measure, according to the process of default failure protection function；
S4：When lower limit of the actual output current value less than setting safe current scope, rising frequency is sent to converter
Increase the order of motor speed, and keep actual output current to be constantly in the range of safe current.
Wherein, the lower limit of the upper limit and safe current scope of the safe current scope is respectively with converter or motor
Rated current increase and reduce the value that obtains of predetermined percentage as reference, or by increasing and reducing specific electric current number
Word sets.
The converter safe current autocontrol method of the present invention, if electric current continues beyond peace when frequency drops to preset value
Total current scope makes error protection measure, according to setting failure protection function setting processing, protection equipment be not damaged by with
And as a kind of normal AutoPlay function application.
Specific embodiment
Below the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment
Only a part of embodiment of the invention, rather than the embodiment of whole.Based on the embodiment in the present invention, the common skill in this area
The every other embodiment obtained under the premise of creative work is not made by art personnel, belongs to the model of present invention protection
Enclose.
The converter safe current autocontrol method of the present embodiment, including：
Step S1, arranges safe current scope and safe current automatic running frequency range.Wherein, frequency range such as 45～
50Hz, concrete numerical value are set according to practical situation.
Step S2, converter actual output current is compared with safe current scope, can be actually defeated by measuring converter
Go out electric current, then compare with the safe current scope.
Step S3, when the actual output current reaches the upper limit of the safe current scope, sends drop to converter
Frequency subtracts the order of motor speed, reduces actual output current, and keeps actual output current to be constantly in safe current scope
It is interior, if frequency is reduced to preset security electric current automatic running frequency range values, and if electric current continuation exceeds safe current scope
Error protection measure is made then, according to the process of default failure protection function.
Step S4, when lower limit of the actual output current value less than setting safe current scope, sends rising to converter
Frequency increases the order of motor speed, and keeps actual output current to be constantly in the range of safe current.
The converter safe current autocontrol method of the present embodiment, (presets frequency when frequency drops to preset range value
During rate lower limit), if electric current continues to make error protection measure beyond safe current scope, at default failure protection function
Reason, protection equipment are not damaged by.And by the lower limit and the upper limit of safe current limiting a current range, it is to avoid in reality
Border electric current when safe current is vacillated now to the left, now to the right, the unstable situation of frequency.
Wherein, the lower limit of the upper limit of safe current scope and safe current scope is respectively with converter or the volume of motor
Determine electric current increases and reduces the value that predetermined percentage is obtained as reference, or is set by increasing and reducing specific current digital
It is fixed.For example：Rated current is 1A, and safe current scope can be (1-10%, 1-20%) or (1-0.1,1+0.2).
Safe current automatic running frequency range can be concrete frequency values lower limit and the upper limit such as 45Hz～50Hz, also may be used
To be the percentage range such as 90%～100% on the basis of converter upper limiting frequency.
The foregoing is only presently preferred embodiments of the present invention, not to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (2)
1. a kind of converter safe current autocontrol method, it is characterised in that including step：
S1：Safe current scope and safe current automatic running frequency range are set；
S2：Converter actual output current is compared with safe current scope；
S3：When the actual output current reaches the upper limit of the safe current scope, frequency reducing rate is sent to converter powered down
The order of machine rotating speed, reduces actual output current, and keeps actual output current to be constantly in the range of safe current, if frequency
When being reduced to preset security electric current automatic running frequency range values, and continue to do if the safe current scope if electric current and be out of order
Protective measure, according to the process of default failure protection function；
S4：When lower limit of the actual output current value less than setting safe current scope, rising frequency increase is sent to converter
The order of motor speed, and keep actual output current to be constantly in the range of safe current.
2. converter safe current autocontrol method as claimed in claim 1, it is characterised in that the safe current scope
The upper limit and safe current scope lower limit be respectively using the rated current of converter or motor as reference increase and reduce
The value that predetermined percentage is obtained, or by increasing and reducing specific current digital setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610934418.9A CN106533320A (en) | 2016-11-01 | 2016-11-01 | Frequency converter safety current automatic control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610934418.9A CN106533320A (en) | 2016-11-01 | 2016-11-01 | Frequency converter safety current automatic control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106533320A true CN106533320A (en) | 2017-03-22 |
Family
ID=58291801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610934418.9A Pending CN106533320A (en) | 2016-11-01 | 2016-11-01 | Frequency converter safety current automatic control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106533320A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107017819A (en) * | 2017-05-18 | 2017-08-04 | 武汉华海通用电气有限公司 | The transient fault traversing control method and system of a kind of high voltage converter |
| CN107477820A (en) * | 2017-07-12 | 2017-12-15 | 广东美的制冷设备有限公司 | Air-conditioner control system, detection means, air conditioner and readable storage medium storing program for executing |
| CN107901210A (en) * | 2017-11-06 | 2018-04-13 | 贵州省工业固体废弃物综合利用（建材）工程技术研究中心 | A kind of two-stage vacuum extruder for blocks Field adjustment control method |
| CN109327179A (en) * | 2017-07-31 | 2019-02-12 | 株洲中车时代电气股份有限公司 | A kind of transducer power control method and frequency changer controller |
| CN112311299A (en) * | 2020-09-18 | 2021-02-02 | 华帝股份有限公司 | Motor control method and cooking device applying same |
| CN114039518A (en) * | 2021-10-26 | 2022-02-11 | 中信重工机械股份有限公司 | Intelligent stepping adjusting method of large ball press based on current control |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402424A (en) * | 2002-06-25 | 2003-03-12 | 满永奎 | Frequency control method for frequency changer for pumping unit |
| CN101527534A (en) * | 2008-03-04 | 2009-09-09 | C.&E.泛音有限公司 | Asynchronous engine and method for operating same on a frequency transformer |
| CN201434400Y (en) * | 2009-04-10 | 2010-03-31 | 上海市东方海事工程技术有限公司 | Double-frequency conversion velocity regulation control device of air preheater |
| CN102031929A (en) * | 2010-11-20 | 2011-04-27 | 威海市海泰起重机械有限公司 | PLC (Programmable Logic Controller) controlled variable-frequency piling machine |
| CN105865192A (en) * | 2016-05-13 | 2016-08-17 | 芜湖飞尚非金属材料有限公司 | Automatic feeding system for rotary dryer |
-
2016
- 2016-11-01 CN CN201610934418.9A patent/CN106533320A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402424A (en) * | 2002-06-25 | 2003-03-12 | 满永奎 | Frequency control method for frequency changer for pumping unit |
| CN101527534A (en) * | 2008-03-04 | 2009-09-09 | C.&E.泛音有限公司 | Asynchronous engine and method for operating same on a frequency transformer |
| CN201434400Y (en) * | 2009-04-10 | 2010-03-31 | 上海市东方海事工程技术有限公司 | Double-frequency conversion velocity regulation control device of air preheater |
| CN102031929A (en) * | 2010-11-20 | 2011-04-27 | 威海市海泰起重机械有限公司 | PLC (Programmable Logic Controller) controlled variable-frequency piling machine |
| CN105865192A (en) * | 2016-05-13 | 2016-08-17 | 芜湖飞尚非金属材料有限公司 | Automatic feeding system for rotary dryer |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107017819A (en) * | 2017-05-18 | 2017-08-04 | 武汉华海通用电气有限公司 | The transient fault traversing control method and system of a kind of high voltage converter |
| CN107477820A (en) * | 2017-07-12 | 2017-12-15 | 广东美的制冷设备有限公司 | Air-conditioner control system, detection means, air conditioner and readable storage medium storing program for executing |
| CN109327179A (en) * | 2017-07-31 | 2019-02-12 | 株洲中车时代电气股份有限公司 | A kind of transducer power control method and frequency changer controller |
| CN109327179B (en) * | 2017-07-31 | 2020-09-22 | 株洲中车时代电气股份有限公司 | Frequency converter power control method and frequency converter control device |
| CN107901210A (en) * | 2017-11-06 | 2018-04-13 | 贵州省工业固体废弃物综合利用（建材）工程技术研究中心 | A kind of two-stage vacuum extruder for blocks Field adjustment control method |
| CN107901210B (en) * | 2017-11-06 | 2019-08-02 | 贵州省工业固体废弃物综合利用（建材）工程技术研究中心 | A kind of two-stage vacuum extruder for blocks Field adjustment control method |
| CN112311299A (en) * | 2020-09-18 | 2021-02-02 | 华帝股份有限公司 | Motor control method and cooking device applying same |
| CN114039518A (en) * | 2021-10-26 | 2022-02-11 | 中信重工机械股份有限公司 | Intelligent stepping adjusting method of large ball press based on current control |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106533320A (en) | Frequency converter safety current automatic control method | |
| CN104779693B (en) | The method of operation of wind turbine pitch system | |
| CN106150852B (en) | A kind of startup-shutdown flow of high water head mixed-flow Large-scale machine set | |
| CN102011699B (en) | Method and system for controlling variable pitch of wind power generator | |
| CN104196088A (en) | Frequency conversion speed regulation and constant pressure pipe network water supply system and control method thereof | |
| CN104682393A (en) | Method for controlling automatic generating and automatic pumping of pumped-storage power station units | |
| US20140153308A1 (en) | Rectifier charge rate controller | |
| CN106253220A (en) | A kind of converter valve cooling system inner cold water enters valve temperature height guard method | |
| CN102053634A (en) | Intelligent temperature controller for dry-type transformer | |
| CN105035960A (en) | Cable crane hoisting mechanism control circuit system with inversion protection function | |
| CN112345254A (en) | Method for early warning thrust bearing temperature of pumped storage power station | |
| CN106788124A (en) | A kind of motor automatic control device and control method | |
| CN109357436B (en) | Variable frequency heat pump control method | |
| US10790772B2 (en) | Power systems | |
| CN105119551A (en) | Large power asynchronous motor frequency conversion and soft start-based control device | |
| CN112963304A (en) | Wind turbine generator overspeed protection auxiliary control method with torque control | |
| CN205451625U (en) | Motor drag a soft start control cabinet | |
| CN108388279B (en) | Control method and device for high-speed rotating mechanical equipment | |
| CN103160333B (en) | Yellow phosphorus tail gas automation total recovery system | |
| CN203722532U (en) | All-digital alternating current crane rotor thyristor speed regulation controller | |
| CN108757420B (en) | The device and implementation method of inspection are carried out to high-voltage electric fire pump using low tension | |
| CN106230023A (en) | The upper off line power method for automatically regulating of a kind of industrial power plant | |
| TWI767545B (en) | Constant frequency energy saving system and method of electric motor | |
| CN101330264A (en) | Soft starter for middle-high voltage solid motor | |
| CN106559024B (en) | Silicon controlled rectifier driving module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170322 |
|
| RJ01 | Rejection of invention patent application after publication |