CN102594227B - Variable frequency control system and engineering machine with same - Google Patents
Variable frequency control system and engineering machine with same Download PDFInfo
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- CN102594227B CN102594227B CN 201210045265 CN201210045265A CN102594227B CN 102594227 B CN102594227 B CN 102594227B CN 201210045265 CN201210045265 CN 201210045265 CN 201210045265 A CN201210045265 A CN 201210045265A CN 102594227 B CN102594227 B CN 102594227B
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Abstract
The invention discloses a variable frequency control system. The system comprises at least one frequency converter (210, 220, 230) and at least one motor (310, 320, 330) which is electrically connected with the at least one frequency converter; and the variable frequency control system is characterized in that the system further comprises a feedback device (400), wherein the direct current end of the feedback device (400) is electrically connected with the direct current end of the at least one frequency converter (210, 220, 230), and the feedback device (400) is used for converting direct current electric energy at the direct current end into alternating current electric energy and feeding the alternating current electric energy back to an electric fence (100) under the situation that voltage at the direct current end of the feedback device (400) is larger than a set voltage threshold.
Description
Technical field
The engineering machinery that the present invention relates to a kind of frequency-changing control system and have this system.
Background technology
Use in the engineering machinery of frequency converter and motor combination at some; derrick crane for example, when adopting motor braking (for example craning weight of same descends or slows down), motor can forward power generation mode to; the electric energy that motor sends can be discharged into usually to be let out on the energy resistance, is converted to thermal energy consumption.In other cases, can adopt electric energy feedback that four-quadrant frequency converter sends motor to electrical network.
But all there is different defectives in above-mentioned two kinds of modes of processing regenerative electric energy.Use lets out that can resistance the electric energy that sends to be converted to thermal energy consumption itself be a kind of waste to energy, and needs to dispose the larger resistor box of volume.Although and the employing four-quadrant frequency converter is not wasted electric energy with regenerative electric energy feedback to electrical network, the four-quadrant frequency converter cost is high, can improve application cost undoubtedly.If need to use a plurality of frequency converters in the engineering machinery, adopt four-quadrant frequency converter on cost performance and uneconomical.
Summary of the invention
The purpose of this invention is to provide low, the energy-conservation scheme of a kind of cost.
To achieve these goals, the invention provides a kind of frequency-changing control system, this system comprises at least one frequency converter; At least one motor that is electrically connected with at least one frequency converter; Wherein, this system also comprises: feedback device, the dc terminal of this feedback device is electrically connected with the dc terminal of at least one frequency converter, this feedback device is used in the situation of the voltage on the dc terminal of this feedback device greater than the setting voltage threshold value, and the direct current energy on the dc terminal of this feedback device is converted to AC energy and this AC energy is fed back to electrical network.
The present invention also provides a kind of engineering machinery, and this project machinery comprises above-mentioned frequency-changing control system.
By technique scheme, the electric energy that motor produces can be fed back to electrical network by feedback device under generating state, environmental protection, energy-saving effect is obvious.
Other features and advantages of the present invention will partly be described in detail in embodiment subsequently.
Description of drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and consists of the part of specification, is used from explanation the present invention with following embodiment one, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structured flowchart of the frequency-changing control system that provides according to the embodiment of the present invention; And
Fig. 2 is the frequency-changing control system main loop circuit figure that provides according to the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.Should be understood that embodiment described herein only is used for description and interpretation the present invention, is not limited to the present invention.
Fig. 1 is the structured flowchart of the frequency-changing control system that provides according to the embodiment of the present invention; Fig. 2 is the frequency-changing control system main loop circuit figure that provides according to the embodiment of the present invention.With reference to figure 1 and Fig. 2, according to an embodiment of the invention, provide a kind of frequency-changing control system, this system can comprise at least one frequency converter 210,220,230; At least one motor 310,320,330 that is electrically connected with at least one frequency converter 210,220,230; Wherein, this system can also comprise:
Described feedback device 400 can be to well known to a person skilled in the art device, and for example Shenzhen adds the feedback device PFH75-4 of energy company.Specifically, feedback device 400 can comprise a plurality of assemblies or function.For example, feedback device 400 can comprise inverter, is used for converting direct-current power into alternating-current power.Feedback device 400 can also comprise comparing unit, is used for the voltage on the dc terminal of feedback device 400 and setting voltage threshold value are compared, and this direct current is outputed to inverter at voltage during greater than the setting voltage threshold value.The setting voltage threshold value can be set flexibly according to different demands.The scope of setting voltage threshold value can for example be 620V-680V.
In order to make the alternating current that feeds back to electrical network 100 can not pollute electrical network 100, described feedback device 400 can also be used for before described AC energy is fed back to electrical network 100 being adjusted to the phase angle of electrical network 100 electric energy the phase angle of this AC energy synchronous.In this case, feedback device 400 can also comprise for the phase angle regulon of regulating AC energy.
In an embodiment of the invention, system can also comprise:
With described at least one frequency converter 210,220,230 exchange at least one first gate-controlled switch K10, K20, the K30 that incoming end is electrically connected;
In further execution mode of the present invention, system can also comprise:
Be arranged at least one second gate-controlled switch J10, J20, J30 between the dc terminal of described at least one frequency converter 210,220,230 dc terminal and described feedback device 400;
When the dc terminal pump up voltage instantaneous variation of big-power transducer (for example the first frequency converter 210) is larger (for example 80V), can be larger on the dc terminal impact of Small-power Inverter (for example the second frequency converter 220 and the 3rd frequency converter 230), can damage Small-power Inverter when serious.Control device 500 can be used for controlling described the second gate-controlled switch J10 in the situation that this feedback signal indicates the electric voltage exception of described feedback device 400 dc terminal to fluctuate thus, J20, J30 disconnect.
Above-mentioned control device 500 can include but not limited to, single-chip microcomputer, PLC controller, dsp chip, FPGA circuit etc.
In an embodiment of the invention, system can also comprise fuse F10, F20, the F30 that is arranged between described at least one frequency converter 210,220,230 dc terminal and described the second gate-controlled switch J10, J20, the J30.The effect that fuse F10, F20, F30 are set is to prevent that dc bus 600 is short-circuited and frequency converter 210,220,230 on the damaged line.
In order to reduce humorous wave interference, can be serially connected with at the ac output end of feedback device 400 filter reactor L40.In addition, this system can also comprise the magnet ring M40 at the ac output end place that is arranged on described feedback device 400.The effect that magnet ring M40 is set is to disturb in order further to reduce high-frequency emission, prevents from other assemblies are caused interference.
At least one frequency converter 210,220,230 can be a plurality of frequency converters.For instance, engineering machinery can be derrick crane, uses three groups of frequency converters and group of motors in derrick crane, namely hoist frequency converter and group of motors, revolution frequency converter and group of motors and luffing frequency converter and group of motors.Therefore, according to an embodiment of the invention, described at least one frequency converter comprises the first frequency converter 210, the second frequency converter 220 and the 3rd frequency converter 230; Described at least one motor 310,320,330 comprises the first motor 310, the second motor 320 and the 3rd motor 330 that is electrically connected with the first frequency converter 210, the second frequency converter 220 and the 3rd frequency converter 230 respectively; This control system can also comprise dc bus 600, and a plurality of terminals of this dc bus 600 are electrically connected with the dc terminal of described the first frequency converter 210, the second frequency converter 220, the 3rd frequency converter 230 and feedback device 400 respectively.
For example, suppose that the first motor 310 is lifting motors of derrick crane, then the first frequency converter 210 can be called the frequency converter that hoists.When crane is transferred lift heavy or is slowed down, the first motor 310 is in generating state, the electric energy that the first motor 310 produces can accumulate on the dc bus 600 by the first frequency converter 210 dc terminal, and the voltage on the dc bus 600 begins rise (being called the pump up voltage) thus.If this moment, the second motor 320 and/or the 3rd motor 330 were operated in motoring condition (namely, consume electric energy), the electric energy that then gathers on the bus offers respectively the second motor 320 and/or the 3rd motor 330 by the second frequency converter 220 and/or the 3rd frequency converter 230, consumes a part of electric energy for it.But, surpass above-mentioned setting voltage threshold value if the voltage on the dc bus 600 rises to, then feedback device 400 converts first the part electric energy that makes voltage on the dc bus 600 surpass the setting voltage threshold value on the dc bus 600 to AC energy and feeds back to electrical network 100 again.The electric energy that feeds back to electrical network 100 can use or use to other power consumption equipments that are connected with electrical network 100 to this frequency-changing control system.Like this, the regenerative electric energy that can optimal produces with motor.
In preferred implementation of the present invention, this system can also comprise magnet ring M10, M20, the M30 at the terminals place that is connected with frequency converter in a plurality of terminals that are arranged on described dc bus 600.The purpose that magnet ring M10, M20, M30 are set is same as described above, also is to disturb in order further to reduce high-frequency emission, prevents from other assemblies are caused interference.
In addition, the power of the second frequency converter 220 and/or the 3rd frequency converter 230 might be than the first frequency converter 210 little, therefore, in order to prevent that the voltage fluctuation on the dc bus 600 from not exerting an influence to the second frequency converter 220 and/or the 3rd frequency converter 230 of smaller power, can be serially connected with reactor at the positive terminal of the dc terminal of described the second frequency converter 220 and/or the 3rd frequency converter 230.
According to an embodiment of the invention, a kind of engineering machinery is provided, this project machinery comprises above-mentioned frequency-changing control system.
The above-mentioned frequency-changing control system that embodiments of the present invention provide, the electric energy that machine operation can be produced under generating state is shared at dc bus 600, again this electric energy is applied to be operated in the motor under the motoring condition, perhaps pass through feedback device 400 with its feedback telegram in reply net 100, environmental protection, energy-saving effect is obvious.In addition, also do not need to use the special frequency converter that involves great expense, for example four-quadrant frequency converter only needs to select general frequency converter to get final product.
Below describe by reference to the accompanying drawings preferred implementation of the present invention in detail; but; the present invention is not limited to the detail in the above-mentioned execution mode; in technical conceive scope of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Need to prove that in addition each the concrete technical characterictic described in above-mentioned embodiment in reconcilable situation, can make up by any suitable mode.
In addition, also can carry out combination in any between the various execution mode of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (9)
1. frequency-changing control system, this system comprises at least one frequency converter (210,220,230); And at least one motor that is electrically connected with at least one frequency converter (310,320,330);
This system also comprises:
Feedback device (400), the dc terminal of this feedback device (400) and at least one frequency converter (210,220,230) dc terminal is electrically connected, this feedback device (400) is used in the situation of the voltage on the dc terminal of this feedback device (400) greater than the setting voltage threshold value, and the direct current energy on the dc terminal of this feedback device (400) is converted to AC energy and this AC energy is fed back to electrical network (100);
At least one first gate-controlled switch (K10, K20, K30) that incoming end is electrically connected that exchanges with described at least one frequency converter;
Be arranged at least one second gate-controlled switch (J10, J20, J30) between the dc terminal of the dc terminal of described at least one frequency converter (210,220,230) and described feedback device (400); And
Control device (500), be used for receiving the feedback signal from described feedback device (400), and in the situation of this feedback signal indication mechanism fault control described the first gate-controlled switch (K10, K20, K30) disconnect, indicate in this feedback signal that described the second gate-controlled switch of control (J10, J20, J30) disconnects in the situation of electric voltage exception fluctuation of dc terminal of described feedback device (400).
2. frequency-changing control system according to claim 1, wherein, described feedback device (400) also is used for being adjusted to the phase angle of electrical network (100) electric energy the phase angle of this AC energy synchronous before described AC energy being fed back to electrical network (100).
3. frequency-changing control system according to claim 1, this system also comprises the dc terminal that is arranged on described at least one frequency converter (210,220,230) and the fuse (F10, F20, F30) between described the second gate-controlled switch (J10, J20, J30).
4. frequency-changing control system according to claim 1, this system also comprises the magnet ring (M40) at the ac output end place that is arranged on described feedback device (400).
5. frequency-changing control system according to claim 1 wherein, is serially connected with filter reactor (L40) at the output of described feedback device (400).
6. the described frequency-changing control system of any one according to claim 1-5, wherein, described at least one frequency converter (210,220,230) comprises the first frequency converter (210), the second frequency converter (220) and the 3rd frequency converter (230); Described at least one motor (310,320,330) comprises the first motor (310), the second motor (320) and the 3rd motor (330) that is electrically connected with the first frequency converter (210), the second frequency converter (220) and the 3rd frequency converter (230) respectively; This control system also comprises dc bus (600), and a plurality of terminals of this dc bus (600) are electrically connected with the dc terminal of described the first frequency converter (210), the second frequency converter (220), the 3rd frequency converter (230) and feedback device (400) respectively.
7. frequency-changing control system according to claim 6, this system also comprises the magnet ring (M10, M20, M30) at the terminals place that connects with frequency converter (210,220,230) in a plurality of terminals that are arranged on described dc bus (600).
8. frequency-changing control system according to claim 6 wherein, is serially connected with reactor (L20, L30) at the positive terminal of the dc terminal of described the second frequency converter (220) and/or the 3rd frequency converter (230).
9. an engineering machinery is characterized in that, this project machinery comprises according to claim 1 the described frequency-changing control system of any one in-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201210045265 CN102594227B (en) | 2012-02-27 | 2012-02-27 | Variable frequency control system and engineering machine with same |
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| CN 201210045265 CN102594227B (en) | 2012-02-27 | 2012-02-27 | Variable frequency control system and engineering machine with same |
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| CN102594227A CN102594227A (en) | 2012-07-18 |
| CN102594227B true CN102594227B (en) | 2013-04-17 |
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| CN 201210045265 Active CN102594227B (en) | 2012-02-27 | 2012-02-27 | Variable frequency control system and engineering machine with same |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103640978B (en) * | 2013-12-24 | 2016-03-02 | 苏州汇川技术有限公司 | Tower machine operation control system and method |
| CN104467012A (en) * | 2014-12-03 | 2015-03-25 | 无锡中鼎物流设备有限公司 | Stacker energy converter and stacker comprising same |
| CN108403380A (en) * | 2018-04-03 | 2018-08-17 | 伊士通（上海）医疗器械有限公司 | A kind of rehabilitation exercise equipment control system and control method based on energy feedback |
| CN109525148A (en) * | 2018-11-19 | 2019-03-26 | 宁波华星科技有限公司 | A kind of winding workshop up- coiler frequency conversion drive increases power supply sharing means |
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| CN201075702Y (en) * | 2007-08-15 | 2008-06-18 | 哈尔滨理工大学 | New type energy feedback device |
| CN201113907Y (en) * | 2007-06-21 | 2008-09-10 | 深圳市库马克新技术股份有限公司 | Hoisting machine variable-frequency speed-regulating device |
| CN201113916Y (en) * | 2007-10-25 | 2008-09-10 | 北京剑能电气有限公司 | Multi- frequency converter common brake unit energy-saving device |
| CN201130923Y (en) * | 2007-11-23 | 2008-10-08 | 广州市京龙工程机械有限公司 | Frequency speed control system |
| CN101673953A (en) * | 2009-09-29 | 2010-03-17 | 杭州浙大太阳电气有限公司 | Novel energy feedback device connectable to multiple frequency converters |
| CN101728837A (en) * | 2009-11-27 | 2010-06-09 | 上海永大吉亿电机有限公司 | Energy feedback system |
| CN201530653U (en) * | 2009-10-27 | 2010-07-21 | 马力 | Elevator electrical energy feedback device |
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- 2012-02-27 CN CN 201210045265 patent/CN102594227B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201113907Y (en) * | 2007-06-21 | 2008-09-10 | 深圳市库马克新技术股份有限公司 | Hoisting machine variable-frequency speed-regulating device |
| CN201075702Y (en) * | 2007-08-15 | 2008-06-18 | 哈尔滨理工大学 | New type energy feedback device |
| CN201113916Y (en) * | 2007-10-25 | 2008-09-10 | 北京剑能电气有限公司 | Multi- frequency converter common brake unit energy-saving device |
| CN201130923Y (en) * | 2007-11-23 | 2008-10-08 | 广州市京龙工程机械有限公司 | Frequency speed control system |
| CN101673953A (en) * | 2009-09-29 | 2010-03-17 | 杭州浙大太阳电气有限公司 | Novel energy feedback device connectable to multiple frequency converters |
| CN201530653U (en) * | 2009-10-27 | 2010-07-21 | 马力 | Elevator electrical energy feedback device |
| CN101728837A (en) * | 2009-11-27 | 2010-06-09 | 上海永大吉亿电机有限公司 | Energy feedback system |
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Address after: 415106 Dingcheng City, Changde Province, the town of irrigation district ZOOMLION Creek Industrial Park Patentee after: Zoomlion Heavy Industry Science & Technology Development Co., Ltd. Address before: 410013 Yuelu District, Hunan, silver basin Road, No. 361, No. Patentee before: Zoomlion Heavy Industry Science & Technology Development Co., Ltd. |
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Address after: 410013 Yuelu District, Hunan, silver basin Road, No. 361, No. Patentee after: Zoomlion Heavy Industry Science & Technology Development Co., Ltd. Address before: 415106 Dingcheng City, Changde Province, the town of irrigation district ZOOMLION Creek Industrial Park Patentee before: Zoomlion Heavy Industry Science & Technology Development Co., Ltd. |
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