CN204578105U - A kind of energy feedback system based on port crane - Google Patents
A kind of energy feedback system based on port crane Download PDFInfo
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- CN204578105U CN204578105U CN201520302289.2U CN201520302289U CN204578105U CN 204578105 U CN204578105 U CN 204578105U CN 201520302289 U CN201520302289 U CN 201520302289U CN 204578105 U CN204578105 U CN 204578105U
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- energy
- storage unit
- feedback system
- system based
- port crane
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Abstract
The utility model provides a kind of energy feedback system based on port crane, comprise lifting mechanism motor, the rectification feedback device also comprising control unit and be electrically connected with electrical network or generating set, described motor is electrically connected with DC bus by two-way inverter, Storage Unit is electrically connected with between described rectification feedback device and two-way inverter, described Storage Unit is provided with checkout gear, described checkout gear detects the voltage of described Storage Unit and DC bus and generates transmission voltage detection signal to described control unit, described control unit receives described voltage detection signal and generates control signal UNICOM or disconnect the charge or discharge loop of described Storage Unit.Energy feedback system provided by the utility model achieves energy-saving and cost-reducing, low and with low cost to electric network pollution.
Description
Technical field
The utility model relates to port crane technical field, particularly relates to a kind of energy feedback system based on port crane.
Background technology
Port crane is the machinery that a class energy consumption is larger.Normally hoist under band carries operating mode due to hoisting machinery course of action or decline tens meters, consequent potential energy is appreciable.The load characteristic of hoisting machinery has two kinds, and one is for walking mechanism, rotating mechanism and the jib lubbing mechanism having balance weight; Another kind is lifting mechanism.For lifting mechanism, being motoring condition when its lifting or empty hook decline, is on-position when load declines.In this two states, an obvious feature is that decentralization process has a large amount of potential energy to need release.
In traditional port crane, the potential energy that harbour machinery load produces and other mechanism can only be consumed by dynamic braking mode because of the regenerated energy of Brake feedback, such as adopt built-in or additional brake unit by the regenerated energy consumption that produces in the resistors, to meet the requirement of gradual braking under various operating mode and other urgent wind prevention braking.This mode both wasted energy, and increased again the thermal pollution of complete machine.
As from the foregoing, it is low to there is energy regeneration utilization ratio in hoisting machinery of the prior art, the defect that energy resource consumption rate is high.
Summary of the invention
The utility model is intended to propose a kind of energy feedback system based on port crane, and overcoming hoisting machinery of the prior art, to there is energy regeneration utilance low, the defect that energy resource consumption rate is high.
The technical scheme that the utility model provides is, a kind of energy feedback system based on port crane, comprise lifting mechanism motor, the rectification feedback device also comprising control unit and be electrically connected with electrical network or generating set, described motor is electrically connected with DC bus by two-way inverter, Storage Unit is electrically connected with between described rectification feedback device and two-way inverter, described Storage Unit is connected with checkout gear, described checkout gear detects the voltage of described Storage Unit and DC bus and generates transmission voltage detection signal to described control unit, described control unit receives described voltage detection signal and generates control signal UNICOM or disconnect the charge or discharge loop of described Storage Unit.
Further, described rectification feedback device is electrically connected with generating set; Described two-way inverter receives the feedback ac signal of described lifting mechanism motor, and described feedback ac signal is converted into DC signal exports described Storage Unit to.
For continuing charging when avoiding Storage Unit saturated, system being caused damage, in described energy feedback system, being also provided with energy consumption resistance.
Further, described rectification feedback device is connected with electrical network, is also provided with the first filter between described rectification feedback device and electrical network, to improve the power factor of system, avoids feedback electric energy to pollute three-phase alternating current electrical network.
For improving the stability of energy feedback system, between described inverter and motor, be provided with the second filter.
Further, also transformer is provided with between described second filter and motor.
As the redundant power of whole feedback system, described Storage Unit is electrically connected with electrical network, to realize the direct charging of electrical network to Storage Unit.
For improving the stability of rectification feedback device, described rectification feedback device comprises multiple PWM rectifier.
Preferably, described control unit is single-chip microcomputer.
Preferably, described Storage Unit is lead acid accumulator.
Energy feedback system based on port crane provided by the utility model, the electric energy of electrical network or generator input and the electric energy of lifting mechanism motor feedback can be allocated by DC bus and Storage Unit, feedback energy can feedback grid or continue as lifting mechanism motoring condition energy supply or for the motor of walking mechanism, jib lubbing mechanism or other auxiliary equipment, or this portion of energy to be stored.Energy feedback system provided by the utility model achieves energy-saving and cost-reducing, low and with low cost to electric network pollution.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural schematic block diagram of a kind of embodiment of the energy feedback system based on port crane provided by the utility model;
The circuit connection diagram that Fig. 2 is energy feedback system shown in Fig. 1.
Embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
For the lifting mechanism of port crane, generally threephase asynchronous machine mainly uses as motor.When threephase asynchronous machine runs at motoring condition, the electromagnetic torque T of motor
eidentical with the rotary speed direction of rotor.But when lifting mechanism motor institute bringing onto load declines, the reason due to self gravitation declines by load.Now, in port crane, the direction of rotation of motor is reverse, its electromagnetic torque T
econtrary with the rotating speed n direction of rotor, rotor speed is reduced, carries out regenerative braking.Therefore, in the process fallen under a load, the effect of motor makes load uniform descent, avoids load constantly to accelerate due to the effect of gravity.Contrast motor powered state, when lifting mechanism institute bringing onto load declines, the real component of current of electric and rotor induction gesture occurs oppositely, and motor can to system feedback energy.
Shown in Figure 1, the present embodiment propose based on the motor 7 being provided with lifting mechanism in the energy feedback system of port crane.The present embodiment is intended to make full use of the energy that motor 7 produces in regenerative braking, make this portion of energy or continue as the motoring condition energy supply of lifting mechanism, or feed back in electrical network, or for the motor of crane travelling gear, jib lubbing mechanism or other auxiliary equipment, or this portion of energy is stored.
As shown in Figure 1, when the motor 7 of lifting mechanism is in motoring condition, the three-phase alternating voltage transported from electrical network 1 or generator changes direct voltage into through the rectification feedback device 3 be electrically connected with it, delivered to by this direct voltage on DC bus 12 and power, the motor 7 that namely the two-way inverter 4 be mounted under DC bus 12 can be lifting mechanism provides reliable AC power.When motoring condition, rectification feedback device 3 is operated in rectification state.
When the motor 7 of lifting mechanism is in regenerative braking state, the threephase stator winding of motor 7 can produce feedback electric energy.Now, by the feedback path that the two-way inverter 4 being in rectification state is formed, namely the electric energy of this part is fed back to DC bus 12, because the lifting of motor 7 and lowering operation carry out according to some cycles, operational transformation related frequency within the fixing cycle, therefore in the unit interval, the gross energy of feedback is very considerable.This part feedback electric energy first can by next cycle be in the motor 7 of motoring condition consume, remaining energy will cause the voltage rise of DC bus 12.Traditional processing mode is by energy consumption equipment, as resistance etc. consumes the energy of this part.But can energy loss be caused like this, the overall energy consumption of increasing device.In the energy feedback system that the present embodiment provides, as shown in Figure 1, be provided with Storage Unit 8 between rectification feedback device 3 and two-way inverter 4, Storage Unit 8 is preferably lead acid accumulator, also can be other energy storage system.When the voltage rise of DC bus 12, namely remaining energy starts as Storage Unit 8 charges, electric energy stores by Storage Unit 8, and export direct current to two-way inverter 4, direct current is converted into three-phase alternating current by two-way inverter 4 again, for being in the motor 7 of motoring condition or the walking mechanism of hoisting machinery or the motor of deflection mechanism or miscellaneous equipment, avoid the meaningless loss of energy.
But for lead acid accumulator, being limited by storage battery volume, capacity and heating quantitative limitation, there is high cost and technological deficiency difficult in maintenance in the whole residue regenerated energy of multiple battery stores of connecting.Be in above-mentioned defect to consider, if use three-phase alternating current electrical network to be feeding electric motors, the another kind of circulation passage of the partial regeneration energy of feedback is fed back in electrical network by rectification feedback device 3.Therefore, as shown in Figure 1, when motor 7 is operated in regenerative braking state, namely rectification feedback device 3 is operated in active inversion state.If Storage Unit 8 is in saturation condition, and feedback electric energy still has residue at the whole hoisting machinery of supply with outside electric loading, then by the rectification feedback device 3 that is in inverter mode by unnecessary electric energy feedback to three-phase alternating current electrical network.The first filter 2 is also provided with between electrical network 1 and rectification feedback device 3.By the first filter 2, the alternating current transmitted through rectification feedback device 3 inversion is adjusted and power network current and the same same-phase frequently of voltage, to improve the power factor of system, avoid feedback electric energy to pollute three-phase alternating current electrical network 1.Same, if use generator to be feeding electric motors, the residue regenerated energy of feedback then needs to be consumed by the energy consumption resistance 9 be arranged in energy feedback system, avoids causing damage to whole Storage Unit 8 or whole feedback system.
Storage Unit 8 is also connected with checkout gear 9, checkout gear 9 connection control unit 11.Checkout gear 9 detects the voltage of Storage Unit 8 and DC bus 12 in real time and formation voltage detection signal is delivered to control unit 11.Control unit 11 generates the break-make that control signal controls Storage Unit 8 charge/discharge loop, to guarantee that in single cycle, first remaining regenerated energy charges for electricity accumulating unit 8, after electricity accumulating unit 8 charging complete; If powered by three-phase alternating current electrical network, then feed back to electrical network by rectification feedback device 3 and the first filter 2; If powered by generator, then consumed by energy consumption resistance 9.Specifically, when the voltage rise of DC bus 12, control unit 11 receiver voltage detection signal also generates the charge circuit conducting that control signal controls between Storage Unit 8 and DC bus 12.Along with the energy on DC bus 12 is fed back to Storage Unit 8 gradually, the voltage on DC bus 12 drops to the output voltage of rectification feedback device 3 gradually, and the residue feedback energy in single cycle is collected complete.Simultaneously, checkout gear 9 detects the voltage of Storage Unit 8 in real time, and the voltage detection signal of Storage Unit 8 is sent to control unit 11, control unit 11 exports the inversion circuit UNICOM that control signal keeps two-way inverter 4 to be formed, and is alternating current and powers for motor 7 by inversion circuit by the DC conversion of Storage Unit 8.If Storage Unit 8 charges saturated in single cycle, control unit 11 receiver voltage detection signal also generates control signal and disconnects charge circuit between electricity accumulating unit 8 and DC bus 12.Control unit 11 can realize the chip of identical functions with single-chip microcomputer or other or circuit is achieved.
As the redundant power of electrical network three-phase alternating-current powered or generating set, Storage Unit 8 itself also directly with electrical network 1 to being connected, between electrical network 1 and Storage Unit 8, be provided with electronic switch.When electrical network three-phase alternating current or generating set cannot normally for lifting mechanism feeding electric motors and the electricity of Storage Unit 8 own not enough time, Storage Unit 8 can pass through the direct electric energy supplement of electrical network, to improve the stability of whole system.Meanwhile, for making the threephase AC electric energy transformed by two-way inverter 4 be lifting mechanism motor 7 stable power-supplying, be also connected with the second filter 5 and transformer 6 in turn at the output of two-way inverter 4, to meet amplitude and the phase requirements of motor 7 input.
Shown in Figure 2, the present embodiment propose based in the energy feedback system of port crane, rectification feedback device 3 and two-way inverter 4 are reversible PWM rectifier.For improving the stability of equipment, rectification feedback device 3 adopts Redundancy Design, is wherein provided with at least two group PWM rectifier.
The energy feedback system based on port crane that the present embodiment proposes, the electric energy of electrical network or generator input and the electric energy of lifting mechanism motor feedback can be allocated by DC bus and Storage Unit, feedback energy can feedback grid or continue as lifting mechanism motoring condition energy supply or for the motor of walking mechanism, jib lubbing mechanism or other auxiliary equipment, or this portion of energy to be stored.The energy feedback system that the present embodiment provides achieves energy-saving and cost-reducing, low and with low cost to electric network pollution.
Last it is noted that above embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (10)
1. the energy feedback system based on port crane, comprise lifting mechanism motor, it is characterized in that, the rectification feedback device also comprising control unit and be electrically connected with electrical network or generating set, described motor is electrically connected with DC bus by two-way inverter, Storage Unit is electrically connected with between described rectification feedback device and two-way inverter, described Storage Unit is connected with checkout gear, described checkout gear detects the voltage of described Storage Unit and DC bus and generates transmission voltage detection signal to described control unit, described control unit receives described voltage detection signal and generates control signal UNICOM or disconnect the charge or discharge loop of described Storage Unit.
2. the energy feedback system based on port crane according to claim 1, is characterized in that, described rectification feedback device is electrically connected with generating set; Described two-way inverter receives the feedback ac signal of described lifting mechanism motor, and described feedback ac signal is converted into DC signal exports described Storage Unit to.
3. the energy feedback system based on port crane according to claim 2, is characterized in that, is also provided with energy consumption resistance in described energy feedback system.
4. the energy feedback system based on port crane according to claim 1, is characterized in that, described rectification feedback device is connected with electrical network, is also provided with the first filter between described rectification feedback device and electrical network.
5. the energy feedback system based on port crane according to claim 1, is characterized in that, is provided with the second filter between described inverter and motor.
6. the energy feedback system based on port crane according to claim 5, is characterized in that, is also provided with transformer between described second filter and motor.
7. the energy feedback system based on port crane according to claim 1, is characterized in that, described Storage Unit is electrically connected with electrical network.
8. the energy feedback system based on port crane according to any one of claim 1-7, is characterized in that, described rectification feedback device comprises multiple PWM rectifier.
9. the energy feedback system based on port crane according to any one of claim 1-7, is characterized in that, described control unit is single-chip microcomputer.
10. the energy feedback system based on port crane according to any one of claim 1-7, is characterized in that, described Storage Unit is lead acid accumulator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520302289.2U CN204578105U (en) | 2015-05-12 | 2015-05-12 | A kind of energy feedback system based on port crane |
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| CN201520302289.2U CN204578105U (en) | 2015-05-12 | 2015-05-12 | A kind of energy feedback system based on port crane |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108545088A (en) * | 2018-04-20 | 2018-09-18 | 江苏达实久信医疗科技有限公司 | Small rail car running gear with electric energy pooling feature |
| CN112678686A (en) * | 2020-12-30 | 2021-04-20 | 青岛港国际股份有限公司 | Rail crane electric quantity management method and system |
-
2015
- 2015-05-12 CN CN201520302289.2U patent/CN204578105U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108545088A (en) * | 2018-04-20 | 2018-09-18 | 江苏达实久信医疗科技有限公司 | Small rail car running gear with electric energy pooling feature |
| CN112678686A (en) * | 2020-12-30 | 2021-04-20 | 青岛港国际股份有限公司 | Rail crane electric quantity management method and system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150819 Termination date: 20160512 |