CN204696978U - The anti-shake electric installation of a kind of frequency converter - Google Patents
The anti-shake electric installation of a kind of frequency converter Download PDFInfo
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- CN204696978U CN204696978U CN201520255580.9U CN201520255580U CN204696978U CN 204696978 U CN204696978 U CN 204696978U CN 201520255580 U CN201520255580 U CN 201520255580U CN 204696978 U CN204696978 U CN 204696978U
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Abstract
The application provides a kind of frequency converter anti-shake electric installation.Described device comprises: central control unit, DC bus-bar voltage detecting unit, energy feedback unit, the described input of DC bus-bar voltage detecting unit is connected with the DC bus of frequency converter, the output of described DC bus-bar voltage detecting unit is connected with central control unit, described central control unit is connected with frequency converter with DC bus-bar voltage detecting unit, and described energy feedback unit is connected between frequency converter and motor.The anti-shake electric installation of a kind of frequency converter that the application provides, by carrying out reduction of speed operation to frequency converter, utilizes the energy produced in motor reduction process to carry out feedback to frequency converter, thus can ensure that the DC bus-bar voltage of frequency converter maintains steadily.Frequency converter can be avoided like this to quit work because of under-voltage, when the outer energy storage device of not plus, solve the rolling electricity problem of frequency converter.
Description
Technical field
The application relates to automation control area, particularly the anti-shake electric installation of a kind of frequency converter.
Background technology
In the industrial production; consider from energy-conservation and motor running secure context; the motor that some power are larger all can adopt frequency converter to carry out drive and protection control; but usually cause the protection act of frequency converter self to cause low-tension motor to be shut down due to voltage ripple of power network or electrical breakdown (namely shake electrical phenomena) in reality; and then cause continuous flow procedure disorderly, cause production accident and huge loss to enterprise.
The way that a lot of frequency converter is taked at present uses uninterrupted power supply or DC UPS to provide back-up source to direct-current loop of frequency converter, this kind of scheme feasibility on weak machine is very high, but be difficult to implement in powerful device, mainly because cost is too high, install loaded down with trivial details.
Utility model content
The object of the embodiment of the present application is to provide a kind of frequency converter anti-shake electric installation, when the outer energy storage device of not plus, solves the rolling electricity problem of frequency converter.
The anti-shake electric installation of a kind of frequency converter that the embodiment of the present application provides is achieved in that
The anti-shake electric installation of a kind of frequency converter, described device comprises: central control unit, DC bus-bar voltage detecting unit, energy feedback unit, the described input of DC bus-bar voltage detecting unit is connected with the DC bus of frequency converter, the output of described DC bus-bar voltage detecting unit is connected with central control unit, and described central control unit is connected with frequency converter with DC bus-bar voltage detecting unit, and described energy feedback unit is connected between frequency converter and motor.
Preferably, described DC bus-bar voltage detecting unit specifically comprises:
Voltage detection module, is used for detecting the DC bus-bar voltage of frequency converter;
First voltage threshold arranges module, is used for pre-setting the first voltage threshold;
Second voltage threshold arranges module, is used for pre-setting the second voltage threshold;
Under-voltage command process module, is used for, when the DC bus-bar voltage detected is lower than described first voltage threshold, sending under-voltage instruction to central control unit; When the DC bus-bar voltage detected equals described second voltage threshold, send to central control unit and remove under-voltage instruction.
Preferably, described first voltage threshold is less than the second voltage threshold.
Preferably, described central control unit specifically comprises:
Information receiving module, is used for receiving under-voltage instruction that DC bus-bar voltage detecting unit sends and removes under-voltage instruction;
Control module, is used for when receiving under-voltage instruction, assigns reduction of speed instruction to frequency converter; When receiving the under-voltage instruction of releasing, assign speed-raising instruction to frequency converter.
Preferably, described energy feedback unit is used for by the Way of Regenerating Energy Feedback of frequency converter reduction of speed rear motor generation in frequency converter, to maintain the stable of DC bus-bar voltage.
Preferably, described device also comprises brake unit, and described brake unit is connected with frequency converter, is used for monitoring the DC bus-bar voltage of frequency converter, when DC bus-bar voltage is higher than predetermined threshold value, carries out voltage division processing to DC bus-bar voltage.
The anti-shake electric installation of a kind of frequency converter that the application provides, by carrying out reduction of speed operation to frequency converter, utilizes the energy produced in motor reduction process to carry out feedback to frequency converter, thus can ensure that the DC bus-bar voltage of frequency converter maintains steadily.Frequency converter can be avoided like this to quit work because of under-voltage, when the outer energy storage device of not plus, solve the rolling electricity problem of frequency converter.
Accompanying drawing explanation
The functional block diagram of the anti-shake electric installation of a kind of frequency converter that Fig. 1 provides for the embodiment of the present application;
Fig. 2 is the functional block diagram of DC bus-bar voltage detecting unit in the application one preferred embodiment;
Fig. 3 is the functional block diagram of central control unit in the application one preferred embodiment;
The anti-shake electric installation of a kind of frequency converter that Fig. 4 provides for the application one preferred embodiment.
Embodiment
The embodiment of the present application provides a kind of frequency converter anti-shake electric installation.Technical scheme in the application is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making other embodiments all obtained under creative work prerequisite, all should belong to the scope of the application's protection.
The functional block diagram of the anti-shake electric installation of a kind of frequency converter that Fig. 1 provides for the embodiment of the present application.As shown in Figure 1, described device comprises: central control unit 100, DC bus-bar voltage detecting unit 200, energy feedback unit 300, the described input of DC bus-bar voltage detecting unit 100 is connected with the DC bus of frequency converter, the output of described DC bus-bar voltage detecting unit 100 is connected with central control unit 200, described central control unit 200 is connected with frequency converter with DC bus-bar voltage detecting unit 100, and described energy feedback unit 300 is connected between frequency converter and motor.
Fig. 2 is the functional block diagram of DC bus-bar voltage detecting unit in the application one preferred embodiment.As shown in Figure 2, described DC bus-bar voltage detecting unit 200 specifically comprises:
Voltage detection module 201, is used for detecting the DC bus-bar voltage of frequency converter;
First voltage threshold arranges module 202, is used for pre-setting the first voltage threshold;
Second voltage threshold arranges module 203, is used for pre-setting the second voltage threshold;
Under-voltage command process module 204, is used for, when the DC bus-bar voltage detected is lower than described first voltage threshold, sending under-voltage instruction to central control unit; When the DC bus-bar voltage detected equals described second voltage threshold, send to central control unit and remove under-voltage instruction.
Described first voltage threshold is less than the second voltage threshold.
Fig. 3 is the functional block diagram of central control unit in the application one preferred embodiment.As shown in Figure 3, described central control unit 100 specifically comprises:
Information receiving module 101, is used for receiving under-voltage instruction that DC bus-bar voltage detecting unit sends and removes under-voltage instruction;
Control module 102, is used for when receiving under-voltage instruction, assigns reduction of speed instruction to frequency converter; When receiving the under-voltage instruction of releasing, assign speed-raising instruction to frequency converter.
The workflow of the anti-shake electric installation of a kind of frequency converter that the application provides will be described in detail below.
Frequency converter operationally, often needs DC bus to provide normal operating voltage to it.But when occurring shaking electrical phenomena, the DC bus-bar voltage being supplied to frequency converter often also can be affected, and being embodied in DC bus-bar voltage can drop.If when frequency converter is operated in under-voltage, damage can be caused to frequency converter.So after falling to certain value under DC bus-bar voltage, frequency converter just can starting resistor protection act, automatically quits work.So the motor be connected with frequency converter also can quit work, thus causes immeasurable loss to enterprise.The embodiment of the present application can be monitored by the DC bus of DC bus-bar voltage detecting unit 200 moment to frequency converter, and the voltage that can be arranged when frequency converter normally works by module 203 by the second voltage threshold is set to Second Threshold voltage, arranges module 202 arrange first threshold voltage by the first voltage threshold.Described first threshold voltage is less than Second Threshold voltage.When the DC bus-bar voltage of frequency converter is lower than first threshold voltage, then illustrates and now there occurs rolling electrical phenomena, the DC bus-bar voltage of supply frequency converter reduces.So, when the DC bus-bar voltage detected is lower than described first voltage threshold, under-voltage instruction can be sent by under-voltage command process module 204 to central control unit 100.
Information receiving module 101 in central control unit 100 in response to this instruction, can assign reduction of speed instruction by control module 102 to frequency converter after receiving the under-voltage instruction that under-voltage command process module 204 sends.After frequency converter receives reduction of speed instruction, reduction of speed can be carried out according to the speed preset.In down speeding procedure, motor is compared to before reduction of speed, unnecessary partial regeneration energy can be produced, the Way of Regenerating Energy Feedback that frequency converter reduction of speed rear motor can be produced by feedback unit 300 by this part regenerated energy in frequency converter, to maintain stablizing of DC bus-bar voltage.After frequency converter receives this part regenerated energy, can be operated under borrowing energy pattern, now the DC bus-bar voltage of frequency converter can continue to rise, and to maintain the normal function of frequency converter, frequency converter can not be allowed because excessively under-voltage and out of service.
If main power source continues to be subject to shaking film sound, so frequency converter will continue reduction of speed, and the regenerated energy produced by reduction of speed maintains the stable of DC bus-bar voltage.When main power source recovers normal, when the electrical phenomena that shakes is eliminated, the DC bus-bar voltage of frequency converter can return to original normal working voltage.Now, DC bus-bar voltage detecting unit 200 can detect that the DC bus-bar voltage of frequency converter has reached Second Threshold voltage, illustrates that main power source has no longer been subject to shaking film sound this moment, has recovered normal.Under-voltage command process module so in DC bus-bar voltage detecting unit 200 204 can send to central control unit 100 and remove under-voltage instruction.
After information receiving module 101 in central control unit 100 receives the under-voltage instruction of described releasing, speed-raising instruction can be assigned by control module 102 to frequency converter.Now, when main power source is no longer subject to shaking film sound, frequency converter does not then need lasting reduction of speed to maintain the stable of DC bus-bar voltage.After frequency converter receives the speed-raising instruction that control module 102 assigns, the speed preset when speed progressively can be promoted to normal work.Like this, frequency converter then can realize the workflow of anti-shake electricity.
The anti-shake electric installation of a kind of frequency converter that Fig. 4 provides for the application one preferred embodiment.As shown in Figure 4, the anti-shake electric installation of described frequency converter is except comprising central control unit 100, outside DC bus-bar voltage detecting unit 200 and energy feedback unit 300, brake unit 400 can also be comprised, described brake unit is connected with frequency converter, be used for monitoring the DC bus-bar voltage of frequency converter, when DC bus-bar voltage is higher than predetermined threshold value, voltage division processing carried out to DC bus-bar voltage.When frequency converter receives reduction of speed instruction, frequency converter can enter borrows energy pattern.But borrowing in energy pattern, occurring that load inertia is excessive sometimes, causing the situation that the energy comparison of energy feedback unit 300 feedback is many.In this case, the DC bus-bar voltage of frequency converter can increase more quickly, thus can exceed the voltage range that frequency converter can bear, and may cause frequency converter failure.In order to avoid the generation of this situation, the application one preferred embodiment then can increase brake unit 400, this brake unit can be made up of common bleeder circuit, when the DC bus-bar voltage of frequency converter exceedes predetermined threshold value, dividing potential drop can be carried out to DC bus-bar voltage, thus reduce the voltage loads of frequency converter, avoid the generation of fault.
The anti-shake electric installation of a kind of frequency converter that the application provides, by carrying out reduction of speed operation to frequency converter, utilizes the energy produced in motor reduction process to carry out feedback to frequency converter, thus can ensure that the DC bus-bar voltage of frequency converter maintains steadily.Frequency converter can be avoided like this to quit work because of under-voltage, when the outer energy storage device of not plus, solve the rolling electricity problem of frequency converter.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the mode that the application can add required general hardware platform by software and realizes.Based on such understanding, the technical scheme of the application can embody with the form of software product the part that prior art contributes in essence in other words.This computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the application or embodiment.
Claims (6)
1. the anti-shake electric installation of frequency converter, it is characterized in that, described device comprises: central control unit, DC bus-bar voltage detecting unit, energy feedback unit, the described input of DC bus-bar voltage detecting unit is connected with the DC bus of frequency converter, and the output of described DC bus-bar voltage detecting unit is connected with central control unit, described central control unit is connected with frequency converter with DC bus-bar voltage detecting unit, and described energy feedback unit is connected between frequency converter and motor.
2. the anti-shake electric installation of a kind of frequency converter as claimed in claim 1, is characterized in that, described DC bus-bar voltage detecting unit specifically comprises:
Voltage detection module, is used for detecting the DC bus-bar voltage of frequency converter;
First voltage threshold arranges module, is used for pre-setting the first voltage threshold;
Second voltage threshold arranges module, is used for pre-setting the second voltage threshold;
Under-voltage command process module, is used for, when the DC bus-bar voltage detected is lower than described first voltage threshold, sending under-voltage instruction to central control unit; When the DC bus-bar voltage detected equals described second voltage threshold, send to central control unit and remove under-voltage instruction.
3. the anti-shake electric installation of a kind of frequency converter as claimed in claim 2, is characterized in that, described first voltage threshold is less than the second voltage threshold.
4. the anti-shake electric installation of a kind of frequency converter as claimed in claim 1, it is characterized in that, described central control unit specifically comprises:
Information receiving module, is used for receiving under-voltage instruction that DC bus-bar voltage detecting unit sends and removes under-voltage instruction;
Control module, is used for when receiving under-voltage instruction, assigns reduction of speed instruction to frequency converter; When receiving the under-voltage instruction of releasing, assign speed-raising instruction to frequency converter.
5. the anti-shake electric installation of a kind of frequency converter as claimed in claim 1, is characterized in that, described energy feedback unit is used for by the Way of Regenerating Energy Feedback of frequency converter reduction of speed rear motor generation in frequency converter, to maintain the stable of DC bus-bar voltage.
6. the anti-shake electric installation of a kind of frequency converter as claimed in claim 1, it is characterized in that, described device also comprises brake unit, described brake unit is connected with frequency converter, be used for monitoring the DC bus-bar voltage of frequency converter, when DC bus-bar voltage is higher than predetermined threshold value, voltage division processing is carried out to DC bus-bar voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520255580.9U CN204696978U (en) | 2015-04-23 | 2015-04-23 | The anti-shake electric installation of a kind of frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520255580.9U CN204696978U (en) | 2015-04-23 | 2015-04-23 | The anti-shake electric installation of a kind of frequency converter |
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| CN204696978U true CN204696978U (en) | 2015-10-07 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602970A (en) * | 2016-12-21 | 2017-04-26 | 中冶南方（武汉）自动化有限公司 | Permanent magnet synchronous motor controller under-voltage fault protection method and system |
| CN107707175A (en) * | 2017-09-11 | 2018-02-16 | 中石化川气东送天然气管道有限公司 | A kind of dead electricity of electric drive compressor crosses over control system and method |
| CN110752812A (en) * | 2019-10-18 | 2020-02-04 | 重庆美的通用制冷设备有限公司 | Frequency converter control method and frequency converter |
| CN112731874A (en) * | 2020-12-21 | 2021-04-30 | 深圳市海浦蒙特科技有限公司 | Power-off shutdown control method and device for industrial control equipment |
-
2015
- 2015-04-23 CN CN201520255580.9U patent/CN204696978U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602970A (en) * | 2016-12-21 | 2017-04-26 | 中冶南方（武汉）自动化有限公司 | Permanent magnet synchronous motor controller under-voltage fault protection method and system |
| CN106602970B (en) * | 2016-12-21 | 2019-11-15 | 中冶南方（武汉）自动化有限公司 | A kind of Permanent Magnet Synchronous Motor Controller under-voltage fault guard method and system |
| CN107707175A (en) * | 2017-09-11 | 2018-02-16 | 中石化川气东送天然气管道有限公司 | A kind of dead electricity of electric drive compressor crosses over control system and method |
| CN110752812A (en) * | 2019-10-18 | 2020-02-04 | 重庆美的通用制冷设备有限公司 | Frequency converter control method and frequency converter |
| CN112731874A (en) * | 2020-12-21 | 2021-04-30 | 深圳市海浦蒙特科技有限公司 | Power-off shutdown control method and device for industrial control equipment |
| CN112731874B (en) * | 2020-12-21 | 2022-05-20 | 深圳市海浦蒙特科技有限公司 | Power-off shutdown control method and device for industrial control equipment |
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Granted publication date: 20151007 Termination date: 20170423 |
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| CF01 | Termination of patent right due to non-payment of annual fee |