CN101728837A - Energy feedback system - Google Patents
Energy feedback system Download PDFInfo
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- CN101728837A CN101728837A CN200910199500A CN200910199500A CN101728837A CN 101728837 A CN101728837 A CN 101728837A CN 200910199500 A CN200910199500 A CN 200910199500A CN 200910199500 A CN200910199500 A CN 200910199500A CN 101728837 A CN101728837 A CN 101728837A
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Abstract
The invention discloses an energy feedback system. A feedback contactor, a filter, an inverter bridge of a feedback device and a foolproof diode in the system are orderly connected to form a feedback channel; the feedback channel realizes the switch-on of the feedback channel through the closing of the feedback contactor, and disconnects the feedback contactor to shut off the feedback channel during the fault protection of the feedback device; a frequency converter externally connected with the feedback device absorbs electric energy from a power grid through a bypass contactor in the feedback device; and the bypass contactor is disconnected when the feedback device is closed and the feedback contactor is connected with the feedback channel and feeds back the electric energy to the power grid, and is closed, so that a rectifier bridge of the frequency converter is connected with the power grid when the feedback of the electric energy is finished. The system adopts a working mode that the two contactors are matched with each other, which can effectively inhibit high-frequency circulating current produced between the feedback device and the frequency converter when the feedback device feeds back the electric energy to the power grid, and effectively prevent the frequency converter from being damaged by the circulating current.
Description
Technical field:
The present invention relates to a kind of energy conserving system, particularly a kind of energy feedback system that can be used for electric dragging system.
Background technology:
Motor drags the load of potential energy formula when back and forth moving, and motor can constantly enter the generator operation state.At this part electric energy that sends, traditional dragging system all adopts the dynamic braking mode to convert it into heat energy and wastes.It is obvious that this situation particularly seems in elevator.Progressively slow down in running until stopping when arriving destination layer when lift car in the running process of elevator, elevator traction machine will discharge mechanical kinetic energy.Lift car still is a potential energy load simultaneously, because lift car and counterweight is of poor quality, lift car also has mechanical potential energy when operation.Discharge when comprising the unnecessary mechanical energy of potential energy and kinetic energy thereby in running, brake, will make elevator motor be in regenerative power generation state when car, thereby with excess energy " regeneration " the one-tenth electric energy of load.The electric energy of being regenerated will become direct current energy to be stored in the electric capacity of frequency converter DC link with inverter converts by the motor of elevator, if stored electric energy in time can not be discharged, will break down, and elevator can't normally be moved.
Usually in the frequency converter DC link, insert brake unit and brake resistance, make regenerative electric energy be braked resistance by the power consumption circuit that forms thus and discharge, thereby prevent that the frequency converter DC side from causing equipment fault because of regenerative electric energy is excessive with timely consumption of the form of heat energy.This processing mode is exactly a dynamic braking mode common in the tradition.
For recycling the electric energy that wastes in traditional dynamic braking, person skilled is used energy feedback device and frequency converter, the feedback device can feed back to electrical network with the electric energy that sends almost losslessly, both reached energy-conservation purpose, avoid a large amount of heatings of high-power resistance in traditional dynamic braking unit again, improved system running environment.But also there is following problem in feedback system of the prior art when operation:
(1) as shown in Figure 4, when adopting the PWM control strategy, between frequency converter 1 and energy feedback device 2, will produce big circulation 3, and can damage be arranged frequency converter.
(2) when feedback device or frequency converter failure; though the feedback device can stop feedback automatically; but because of not possessing the function of contactor and the self check of fool proof diode function; can't guarantee that feedback device feedback path does not provide electric energy to frequency changer direct current bus, therefore the safe operation to original transmission device causes potential risk.
Summary of the invention:
The present invention is directed to the existing problem of above-mentioned energy feedback system, and provide a kind of energy feedback system, this feedback system can effectively suppress the circulation that occurs in the circuit, avoid frequency converter is caused damage, come strengthening system reliability of operation and fail safe by contactor and fool proof diode are carried out the function self check simultaneously.
In order to achieve the above object, the present invention adopts following technical scheme:
Energy feedback system, described system and frequency converter are used, it comprises feedback contactor, filter, feedback device inverter bridge and fool proof diode, described system also comprises bypass contactor, and described feedback contactor, filter, feedback device inverter bridge and fool proof diode are in turn connected to form the feedback path; Described feedback path disconnects the feedback contactor to cut off described feedback path by the closed connection that realizes the feedback path of feedback contactor with when the feedback device error protection; The external frequency converter of described feedback device obtains electric energy by the bypass contactor in the feedback device from electrical network; Described bypass contactor is connected the feedback path and is disconnected during to the electrical network feedback electric energy at the closed feedback contactor of feedback device, and closure made frequency converter rectifier bridge connection electrical network when described bypass contactor finished in feedback electric energy.
The fool proof diode that is arranged in the described system on the feedback path can be a fool proof diode or two fool proof diodes.
Described system also is provided with the function selftest module, and this module will forbid automatically that system to the electrical network feedback electric energy, disconnects the feedback contactor simultaneously when detecting fault, and the bypass contactor that closes; Making frequency converter obtain electric energy by bypass contactor from electrical network under the cooperation of self dynamic braking unit works on; Described function selftest module comprises fool proof diode function selftest module and feedback contactor function selftest module.
Described fool proof diode function selftest module is realized self-checking function in the following manner:
(401) in the process of feedback electric energy, energy feedback system self DC bus-bar voltage instruction is arranged in is higher than frequency converter brake unit operating point voltage one specific threshold in the special time;
(402) if can reach described voltage instruction value in this special time self-energy feedback system actual DC busbar voltage, then fool proof diode function is normal;
(403) if fail to reach described voltage instruction value or energy feedback system grid side electric current exceeds certain specific threshold in this special time self-energy feedback system actual DC busbar voltage, fool proof diode dysfunction then, short trouble appears, system will be stopped to the electrical network feedback electric energy, and disconnect the feedback contactor.
Described feedback contactor function selftest module is realized self-checking function in the following manner:
(501) when frequency converter works in generating operating mode, energy feedback system self DC bus-bar voltage instruction is arranged in to be higher than frequency converter brake unit operating point voltage one specific threshold in the special time and to control the feedback contactor is in off-state, make system enter operating state simultaneously to the electrical network feedback electric energy;
(502) can reach described voltage instruction value or energy feedback system grid side electric current exceeds certain specific threshold in this special time self-energy feedback system actual DC busbar voltage, showing then that the feedback contactor occurs can't normally open fault, system will be stopped to the electrical network feedback electric energy, and disconnect the feedback contactor;
(503) fail to reach described voltage instruction value in this special time self-energy feedback system actual DC busbar voltage, then feedback contactor function is normal.
Described feedback contactor function selftest module cooperates with the feedback contactor that disposes auxiliary contact, and realizes self-checking function in the following manner:
(601) the detected feedback contactor of auxiliary contact work at present status signal on the check and analysis feedback contactor;
Whether (602) compare detected work at present status signal consistent with the control signal that energy feedback system sends: if consistent, the feedback contactor is working properly; If inconsistent, show that the feedback contactor breaks down.
Also be provided with bypass contactor function selftest module in the described system, the bypass contactor that is mated disposes auxiliary contact, and described bypass contactor function selftest module is realized self-checking function in the following manner:
(701) the detected bypass contactor work at present of these auxiliary contact of check and analysis status signal;
(702) more detected bypass contactor work at present status signal is consistent with the control signal that energy feedback system sends, if both unanimities show that then bypass contactor is working properly; If inconsistent, show that bypass contactor breaks down, control system stops to the electrical network feedback electric energy, and disconnects the feedback contactor.
The present invention who obtains according to technique scheme adopts two contactors can effectively suppress circulation, effectively prevents the damage of circulation to frequency converter.Adopt the control strategy of feedback electric current based on sine wave simultaneously, behind filter filtering, the current/voltage harmonic content of output is low, and is little to electric network pollution.
The present invention also possesses contactor and fool proof diode self-checking function, can guarantee that the feedback path does not provide electric energy to frequency changer direct current bus, avoids the operation of original transmission device is caused potential risk.
The present invention not only can be used under the elevator drive system, and other are various to exist under the electric dragging system of generating operating mode and all can use.
Description of drawings:
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is a main circuit schematic diagram of the present invention.
Fig. 2 is another main circuit schematic diagram among the present invention.
Fig. 3 is the circuit diagram of feedback path among the present invention.
Fig. 4 for existing feedback device when feedback and the circulation schematic diagram that produces between frequency converter.
Embodiment:
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
The present invention is for fear of the existing problem of existing electric energy feedback system, and the feedback system of novel energy as illustrated in fig. 1 and 2 is provided.
As shown in Figure 1, this system 100 mainly comprises feedback contactor K1, filter, first inverter bridge, the first fool proof diode D1, bypass contactor K2.Wherein electrical network 300 is by frequency converter rectifier bridge 201 power supplies of the bypass contactor K2 in the system 100 in frequency converter 200, one side of first inverter bridge 101 is connected to frequency changer direct current bus side 203 (as shown in Figure 3) by the first fool proof diode D1, opposite side is connected with feedback device filter 102, feedback device filter 102 connects electrical network 300 by feedback contactor K1, thereby forms the feedback path.On this feedback path, one second fool proof diode D2 (as shown in Figure 2) can be increased again, the better protection effect can be played; Only adopt the first fool proof diode D1 or the second fool proof diode D2 in actual applications or adopt two fool proof diodes all can satisfy functional requirement simultaneously.
Relating to as shown in Figure 3 of concrete feedback path,, feedback contactor K1 in this path realizes connection and failure protection function to whole feedback path.During to the electrical network feedback electric energy, feedback contactor K1 closure is connected the feedback path at whole feedback system.Corresponding electric energy is that feedback device inverter bridge 101, feedback device filter 102 and K1 are transmitted back to electrical network 300 through frequency changer direct current bus side 203, first inverter bridge successively.When feedback device fault, contactor K1 disconnects, and above-mentioned path is opened circuit, and both can thoroughly cut off electrical network through the path of feedback device inverter bridge to the power supply of frequency changer direct current bus side, can avoid fault further to worsen again.
Bypass contactor K2 is used to control three phase network to 204 power supplies of frequency converter rectifier bridge 201 input sides; The feedback path during to the electrical network feedback electric energy bypass contactor K2 disconnect, can suppress circulation; And it is closed again to finish back bypass contactor K2 in feedback, and electrical network is powered to the frequency converter rectifier bridge through bypass contactor K2.
The PWM voltage that produces when filter 102 is used for feedback device converter bridge switching parts device moved carries out filtering, reduces to be input to the PWM harmonic current of electrical network.
The three-phase brachium pontis that power switch pipe VT1 on the feedback device inverter bridge 101～VT6 forms is used for direct voltage is reverse into alternating voltage.
Fool proof diode D1, D2 are placed in feedback device inverter bridge respectively and connect on the P, N bus of frequency changer direct current bus, can be used for preventing that P, N bus from connecing anti-damage device.But D1 and D2 can adopt in actual applications, also can appoint to get one and all can satisfy application demand.
When the frequency converter 200 that the energy feedback system 100 that obtains according to technique scheme and the frequency converter rectifier bridge 201 and second inverter bridge 202 are formed was used, its concrete running was as follows:
When motor 400 electric operations, bypass contactor K2 closure, the electronic supply access of being made up of K2, frequency converter rectifier bridge and second inverter bridge provides electric energy to motor 400.Feedback this moment device inverter bridge 101 is not worked, and whole electric energy feedback system is in holding state; The alternating current of electrical network 300 is powered to frequency converter rectifier bridge 201 input sides 204 through bypass contactor K2, thereby realizes 400 operations of frequency converter 100 CD-ROM drive motor.
When motor 400 generator operations, the voltage on the frequency changer direct current bus will rise, and the voltage U dc that is connected on the feedback device dc bus with it simultaneously also can rise thereupon.After the voltage U dc on the feedback device dc bus rises to preset threshold, electric energy feedback system 100 will make feedback contactor K1 closure, bypass contactor K2 disconnect, thereby connect the feedback path, disconnect electronic supply access.Electric energy feedback system 100 is controlled on the setting voltage value voltage U dc on the feedback device dc bus by controlling its inverter bridge 101 working methods, and beginning is to electrical network 300 feedback electric energy.Can avoid the appearance of electric energy feedback device system 100 and frequency converter 200 rectifier bridges 201 circulation because bypass contactor K2 disconnects this moment.After feedback electric energy finished, feedback device system entered holding state with closed K2.
When energy feedback system detects catastrophe failure, with the function of forbidding voluntarily to the electrical network feedback electric energy, and disconnection feedback contactor K1 makes the thorough and electrical network disconnection of feedback path, simultaneously closed bypass contactor K2 guarantees that frequency converter can continue to obtain electric energy through bypass contactor K2 from electrical network, keeps the continuation reliability service of frequency converter.
For the Primary Component that can in time know the electric energy feedback system whether normal, further reduce the influence of feedback device faults itself to drive system, energy feedback system provided by the invention has self-checking function to fool proof diode, feedback contactor K1 and bypass contactor K2.Being achieved as follows of corresponding self-checking function:
Fool proof diode self-checking function:
Not doing under the fool proof diode function self check situation, when feedback moved, feedback system was provided with the instruction of self DC bus-bar voltage lower slightly than the operation voltage of frequency converter dynamic braking unit.When doing the self check of fool proof diode, feedback system is provided with the instruction of self DC bus-bar voltage to such an extent that exceed certain threshold values than the operation voltage of frequency converter dynamic braking unit in regeneration processes, if after this feedback system actual DC busbar voltage can rise to this value of setting, illustrate that then the fool proof diode operation is normal; If voltage, then illustrates the short circuit damage of fool proof diode less than maybe rising to frequency converter brake unit operating point voltage, system will be stopped to the electrical network feedback electric energy, and disconnect the feedback contactor.
Feedback contactor K1 self-checking function, the present invention can realize by following dual mode:
(1) in the process of feedback electric energy, system sends the K1 cut-off signal to the feedback device, energy feedback system is provided with the instruction of self DC bus-bar voltage and is higher than frequency converter brake unit operating point voltage one specific threshold and controls the feedback contactor in special time and make it be in off-state, makes system enter operating state to the electrical network feedback electric energy simultaneously; If can reach described voltage instruction value or energy feedback system grid side electric current exceeds certain specific threshold in this special time self-energy feedback system actual DC busbar voltage, showing then that the feedback contactor occurs can't normally open fault; If fail to reach described voltage instruction value, show that then feedback contactor function is normal in this special time self-energy feedback system actual DC busbar voltage.
(2) give feedback contactor K1 equipped auxiliary contact, the information of utilizing the output of K1 auxiliary contact is as feedback signal, and the feedback contactor K1 control signal of sending with system compares.If both signals are inconsistent, feedback contactor K1 operation irregularity is described then; If both signal unanimities illustrate that then feedback contactor K1 is working properly.
Bypass contactor K2 self-checking function:
Give bypass contactor K2 equipped auxiliary contact, the information of utilizing the output of bypass contactor K2 auxiliary contact is as feedback signal, and the bypass contactor K2 control signal of sending with system compares.If both signals are inconsistent, bypass contactor K2 operation irregularity is described then; If both signal unanimities illustrate that then bypass contactor K2 is working properly.
Because above-mentioned self-checking function, make energy feedback system that this patent provides when detecting fault, with forbidding self function automatically, disconnect the feedback contactor simultaneously to the electrical network feedback electric energy, and the bypass contactor that closes; Frequency converter obtains electric energy by bypass contactor from electrical network and works under the cooperation of self dynamic braking unit afterwards.
The present invention who is obtained by technique scheme adopts the control strategy of feedback electric current based on sine wave, and behind filter filtering, the current/voltage harmonic content of output is low, and is little to electric network pollution.When feedback, by disconnecting bypass contactor K2, the circulation that brings in the time of can suppressing the action of feedback device converter bridge switching parts fully.When fault, disconnect and the unidirectional on state characteristic of fool proof diode by control bypass contactor K2 closure and feedback contactor K1, make frequency converter under the cooperation of self dynamic braking unit, obtain electric energy from electrical network and work on, thereby can be good at guaranteeing that the fault of feedback system self does not influence the continuation operation and the security performance of original drive system by bypass contactor.
The present invention also can be applicable in other various electric dragging systems that have a generating operating mode, and its concrete scheme implemented and running are not given unnecessary details as mentioned above herein.
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (7)
1. energy feedback system, described system and frequency converter are used, it comprises feedback contactor, filter, feedback device inverter bridge and fool proof diode, it is characterized in that, described system also comprises bypass contactor, and described feedback contactor, filter, feedback device inverter bridge and fool proof diode are in turn connected to form the feedback path; Described feedback path disconnects the feedback contactor to cut off described feedback path by the closed connection that realizes the feedback path of feedback contactor with when the feedback device error protection; The external frequency converter of described feedback device obtains electric energy by the bypass contactor in the feedback device from electrical network; Described bypass contactor is connected the feedback path and is disconnected during to the electrical network feedback electric energy at the closed feedback contactor of feedback device, and closure made frequency converter rectifier bridge connection electrical network when described bypass contactor finished in feedback electric energy.
2. energy feedback system according to claim 1 is characterized in that, the fool proof diode that is arranged in the described system on the feedback path can be a fool proof diode or two fool proof diodes.
3. energy feedback system according to claim 1 is characterized in that described system also is provided with the function selftest module, this module is when detecting fault, to forbid automatically that system to the electrical network feedback electric energy, disconnects the feedback contactor simultaneously, and the bypass contactor that closes; Making frequency converter obtain electric energy by bypass contactor from electrical network under the cooperation of self dynamic braking unit works on; Described function selftest module comprises fool proof diode function selftest module and feedback contactor function selftest module.
4. energy feedback system according to claim 3 is characterized in that, described fool proof diode function selftest module is realized self-checking function in the following manner:
(401) in the process of feedback electric energy, energy feedback system self DC bus-bar voltage instruction is arranged in is higher than frequency converter brake unit operating point voltage one specific threshold in the special time;
(402) if can reach described voltage instruction value in this special time self-energy feedback system actual DC busbar voltage, then fool proof diode function is normal;
(403) if fail to reach described voltage instruction value or energy feedback system grid side electric current exceeds certain specific threshold in this special time self-energy feedback system actual DC busbar voltage, fool proof diode dysfunction then, short trouble appears, system will be stopped to the electrical network feedback electric energy, and disconnect the feedback contactor.
5. energy feedback system according to claim 3 is characterized in that, described feedback contactor function selftest module is realized self-checking function in the following manner:
(501) when frequency converter works in generating operating mode, energy feedback system self DC bus-bar voltage instruction is arranged in to be higher than frequency converter brake unit operating point voltage one specific threshold in the special time and to control the feedback contactor is in off-state, make system enter operating state simultaneously to the electrical network feedback electric energy;
(502) can reach described voltage instruction value or energy feedback system grid side electric current exceeds certain specific threshold in this special time self-energy feedback system actual DC busbar voltage, showing then that the feedback contactor occurs can't normally open fault, system will be stopped to the electrical network feedback electric energy, and disconnect the feedback contactor;
(503) fail to reach described voltage instruction value in this special time self-energy feedback system actual DC busbar voltage, then feedback contactor function is normal.
6. energy feedback system according to claim 3 is characterized in that, described feedback contactor function selftest module cooperates with the feedback contactor that disposes auxiliary contact, and realizes self-checking function in the following manner:
(601) the detected feedback contactor of auxiliary contact work at present status signal on the check and analysis feedback contactor;
Whether (602) compare detected work at present status signal consistent with the control signal that energy feedback system sends: if consistent, the feedback contactor is working properly; If inconsistent, show that the feedback contactor breaks down.
7. energy feedback system according to claim 1, it is characterized in that, also be provided with bypass contactor function selftest module in the described system, the bypass contactor that is mated disposes auxiliary contact, and described bypass contactor function selftest module is realized self-checking function in the following manner:
(701) the detected bypass contactor work at present of these auxiliary contact of check and analysis status signal;
(702) more detected bypass contactor work at present status signal is consistent with the control signal that energy feedback system sends, if both unanimities show that then bypass contactor is working properly; If inconsistent, show that bypass contactor breaks down, control system stops to the electrical network feedback electric energy, and disconnects the feedback contactor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101995001A CN101728837B (en) | 2009-11-27 | 2009-11-27 | Energy feedback system |
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| CN2009101995001A CN101728837B (en) | 2009-11-27 | 2009-11-27 | Energy feedback system |
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| CN101728837B CN101728837B (en) | 2012-08-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102424313A (en) * | 2011-08-19 | 2012-04-25 | 上海新时达电气股份有限公司 | Elevator system |
| CN102594227A (en) * | 2012-02-27 | 2012-07-18 | 中联重科股份有限公司 | Variable frequency control system and engineering machine with same |
| CN106253771A (en) * | 2016-08-26 | 2016-12-21 | 绵阳市维博电子有限责任公司 | A kind of energy release system driven for double-winding motor Hot Spare |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI505205B (en) * | 2012-12-04 | 2015-10-21 | Inst Information Industry | Feedback system, feedback method and recording media thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201051718Y (en) * | 2007-06-22 | 2008-04-23 | 北京利德华福电气技术有限公司 | Power unit module with energy feedback device |
| CN201100940Y (en) * | 2007-09-24 | 2008-08-13 | 深圳市英威腾电气股份有限公司 | Main circuit structure for middle and low voltage energy feedback power unit |
| CN201296590Y (en) * | 2008-11-26 | 2009-08-26 | 广东菱王电梯有限公司 | An elevator power source regeneration system |
-
2009
- 2009-11-27 CN CN2009101995001A patent/CN101728837B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102424313A (en) * | 2011-08-19 | 2012-04-25 | 上海新时达电气股份有限公司 | Elevator system |
| CN102594227A (en) * | 2012-02-27 | 2012-07-18 | 中联重科股份有限公司 | Variable frequency control system and engineering machine with same |
| CN102594227B (en) * | 2012-02-27 | 2013-04-17 | 中联重科股份有限公司 | Variable frequency control system and engineering machine with same |
| CN106253771A (en) * | 2016-08-26 | 2016-12-21 | 绵阳市维博电子有限责任公司 | A kind of energy release system driven for double-winding motor Hot Spare |
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| CN101728837B (en) | 2012-08-22 |
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Owner name: SHANGHAI GIE ELECTRIC MACHINE CO., LTD. Free format text: FORMER NAME: SHANGHAI YUNGTAY GIE MOTOR CO., LTD. |
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Address after: 201615 Shanghai city Songjiang District town Jiuting Yaohan Road No. 77 Patentee after: Shanghai GIE EM Co., Ltd. Address before: 201615, Jiuting hi tech park, Shanghai, the Yanghe River, Songjiang District Bang Road, No. 180 Patentee before: Shanghai Yungtay Gie Co., Ltd. |
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Effective date of registration: 20171123 Address after: 201615 Shanghai, Songjiang District, No. nine new road, No. 99 Patentee after: Yungtay elevator equipment Co., Ltd. (China) Address before: 201615 Shanghai city Songjiang District town Jiuting Yaohan Road No. 77 Patentee before: Shanghai GIE EM Co., Ltd. |
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Effective date of registration: 20190730 Address after: 201615 Shanghai city Songjiang District town Jiuting Yaohan Road No. 77 Patentee after: Shanghai GIE EM Co., Ltd. Address before: 201615 Shanghai, Songjiang District, No. nine new road, No. 99 Patentee before: Yungtay elevator equipment Co., Ltd. (China) |