CN201647835U - Hybrid power RTG electrical system - Google Patents
Hybrid power RTG electrical system Download PDFInfo
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- CN201647835U CN201647835U CN2009202557387U CN200920255738U CN201647835U CN 201647835 U CN201647835 U CN 201647835U CN 2009202557387 U CN2009202557387 U CN 2009202557387U CN 200920255738 U CN200920255738 U CN 200920255738U CN 201647835 U CN201647835 U CN 201647835U
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Abstract
The utility model relates to the electrical control technical field of a crane, in particular to a hybrid power RTG electrical system; the hybrid power RTG electrical system comprises a power generator and a rectifying device connected with the power generator; alternating current power supply is converted into direct-current power supply by the rectifying device, direct-current power supply is provided to a frequency changer by a direct-current bus, an energy exchange device is arranged on the direct-current bus; the energy exchange device comprises a programmable controller, a boosting controller arranged on the direct-current bus, a charging and discharging controller connected on the direct-current bus between the boosting controller and the frequency changer, and a storage battery system connected on the charging and discharging controller, the programmable controller is connected with the boosting controller by a field bus, data interaction of the charging and discharging controller and the storage battery system is carried out, and the storage battery system comprises a storage battery, a status sensor, a protective circuit, a cooling ventilation device and a storage management device, the energy saving effect is good, pollution to air is reduced, the noise of the power generator is reduced, and the hybrid power RTG electrical system provides stable direct-current bus voltage for the RTG system.
Description
Technical field
The utility model relates to the electronic control technology field of hoisting crane, especially a kind of hybrid power RTG electric system.
Background technology
At the harbour container harbour, storage yard operation mainly relies on rubbertyred container gantry crane (RubberTyre Gantry Crane is called for short RTG).Because RTG adopts the diesel power generation unit as the power that machine system is provided.Do not need cable to be connected to the harbour power supply, therefore easy to use, flexible operation is used in a large number by container wharf.
Energy shortage in recent years, oil price are constantly soaring, and shipping and delivery cost is high." how improving the efficiency of RTG " becomes the target of public criticism of reducing energy consumption already.Make a general survey of numerous RTG power-economizing methods, by the main 3 big classes of dividing of energy-conservation strategy.First adopts " oil changes ", can reduce use cost significantly, and shortcoming is that the power supply facilities that adds brings difficulty to production; Second adopts hybrid power system, uses the energy storage mode, and shortcoming is that energy-saving effect is general; The 3rd adopts engine governed speed, and the low oil consumption characteristic when making full use of low engine speed reduces consumption of fuel, and shortcoming is that amount of energy saving is little.
Existing electric control system changes source of AC into direct supply by rectifying device, provides direct supply by dc bus for the frequency converter of each mechanism.When freight container and suspender decline, frequency converter changes potential energy into electric energy, and energy feeds back to dc bus.Because gathering of feedback energy will make DC bus-bar voltage raise.Former RTG electric system adopts brake unit that electric energy is discharged into the mode of energy consumption resistance, and DC bus-bar voltage is controlled in the safe scope.Cause energy dissipation and environmental pollution like this.
Because this part energy is huge, just can reach good energy-saving effect if can get off the energy saving of this part waste.Obviously, huge energy just needs high-capacity closed-center system, and we attempted flywheel energy storage, also attempts super capacitor energy-storage, and these methods have all been created the result out of imagination, really can be used in actual operation.But for the job behavior of this irregularities of RTG, these methods are still unable to do what one wishes.Mainly show: 1, can only store the energy that once decline process produces usually, if continuously freight container is hung entrucking from eminence, follow-up energy still can only consume by energy consumption resistance.These closed-center systems do not have endurance, increase capacity if desired, and its high cost, huge volume and the weight of generation are that the RTG system is unacceptable; 2, owing to the inherent characteristic of these closed-center systems, each energy discharges and can not exhaust fully, and for example: fly wheel system must be kept certain basic rotating speed, can not allow it operate in low regime.Super capacitor must leave enough voltage, and too system can't normal operation during low voltage.
The utility model content
The technical problems to be solved in the utility model is: for shortcoming and the deficiency that solves above-mentioned existence, reduce and mix the energy cost, a kind of hybrid power RTG electric system is provided, utilize the mixing point of the common DC bus of frequency conversion system in the native system scheme dexterously, on electric system, carry out energy exchange as energy.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of hybrid power RTG electric system, have electrical generator and the rectifying device that is connected electrical generator, rectifying device changes source of AC into direct supply, by dc bus direct supply is offered converter plant, dc bus is provided with the energy exchange device, the energy exchange device comprises Programmable Logic Controller, be arranged on the boost pressure controller on the dc bus, be connected charging-discharging controller on the dc bus and the battery system that is connected on the charging-discharging controller between boost pressure controller and the converter plant, Programmable Logic Controller is by fieldbus and boost pressure controller, charging-discharging controller and battery system carry out data exchange, Comprehensive Control and management by Programmable Logic Controller, understand the capacity and the running state of battery system in real time, correctly battery system is discharged and recharged control.
Further, the monitoring device of monitoring battery data is set on the described storage battery, makes things convenient for data such as monitor battery capacity, voltage, temperature, send the data that monitor to Programmable Logic Controller, control then.
For convenience of information such as calculating accumulator capacity and detection battery temperature, voltages, battery system comprises storage battery, state sensor, protective circuit, cooling channel device and battery management device.
In order to satisfy the requirement of RTG system stored energy, storage battery is the NiHM battery, has high capacity, superpower, long-life character, and voltage can be up to 530 volts.
Reduce electric current for vdc is raised, horsepower output that simultaneously can limiting engine adopts boost pressure controller and loop reactor to form the BOOST circuit, with the voltage rising of the unsettled dc bus of original system, and is stabilized in the required voltage value.Each mechanism's frequency converter for RTG provides constant dc bus power supply like this, and it was more superior originally to make frequency converter drive the performance ratio of each mechanism's electrical motor.Can control simultaneously energy output from electrical generator.
Charging-discharging controller is the bridge that transmits energy between dc bus and the storage battery, is the control core of mixing the energy system.This device can be according to the order timesharing control charge or discharge of system.Because charging and discharging process is very of short duration sometimes, so this device has very high switch speed.
Mix and control system to adopt a cover PLC controller to coordinate and manage.PLC and boost pressure controller, charging-discharging controller, battery system adopt fieldbus to carry out data exchange, understand accumulator capacity and system running state in real time, correctly charging and discharging of accumulator are controlled.Adopt man-machine interface to provide status information and fault history simultaneously for the handler.Be this scheme key of success the service life of mixing storage battery in the energy system, except that the good characteristic of itself, needs the reasonable control of PLC system could guarantee permanent the use.Therefore PLC system necessity is measured the capacity of storage battery at any time, must guarantee to discharge and recharge reliable execution when normal lifting or when transferring freight container, when readiness for action must according to the capacity of storage battery suitably accumulators replenish suitable energy.Detect the voltage of charging and discharging currents, each battery module, the temperature of each battery module etc. simultaneously, warning will be provided or make corresponding processing if surpass the permission parameter.
The beneficial effects of the utility model are, hybrid power RTG electric system of the present utility model has good energy-saving effect, and simultaneously its reduces pollution to atmosphere, has reduced the noise of diesel-driven, for the RTG system provides stable DC bus-bar voltage, make system's operation more reliable.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is a circuit connection diagram of the present utility model.
Among the figure 1, electrical generator, 2, rectifying device, 3, converter plant, 41, Programmable Logic Controller, 42, boost pressure controller, 43, charging-discharging controller, 44, battery system, 45, monitoring device.
The specific embodiment
In conjunction with the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the scheme drawing of simplification, basic structure of the present utility model only is described in a schematic way, so it only show the formation relevant with the utility model.
The hybrid power RTG electric system of preferred forms as shown in Figure 1, have electrical generator 1 and the rectifying device 2 that is connected electrical generator 1, rectifying device 2 changes source of AC into direct supply, by dc bus direct supply is offered converter plant 3, dc bus is provided with the energy exchange device, the energy exchange device comprises Programmable Logic Controller 41, be arranged on the boost pressure controller 42 on the dc bus, be connected charging-discharging controller on the dc bus 43 and the battery system 44 that is connected on the charging-discharging controller 43 between boost pressure controller 42 and the converter plant 3, Programmable Logic Controller 41 is by fieldbus and boost pressure controller 42, charging-discharging controller 43 and battery system 44 carry out data exchange.
The monitoring device 45 of monitoring battery data is set on the battery system 44, and battery system 44 comprises storage battery, state sensor, protective circuit, cooling channel device and battery management device.Storage battery is the NiHM battery.
Working process of the present utility model, electrical generator 1 is except still powering to ancillary system, no longer directly be sent to dc bus behind the power rectifier of power circuit, insert dc bus again but boost into stable setting voltage, can control the energy that provides to dc bus simultaneously by the BOOST circuit.When needs are mentioned a freight container, because the energy of driving engine can limit, the gross energy of DC bus system will be not enough to complete successfully promote and operate.This moment, the PLC system can detect the deficiency of system capacity, started the battery discharging function, provided energy for lifting mechanism simultaneously by storage battery and electrical generator 1.When needs were put next freight container, the energy of driving engine still can be restricted, and potential energy changes electric energy into during owing to decline, and the energy of feedback will make DC bus-bar voltage raise, in order to prevent to the energy consumption resistance discharge waste energy.This moment, the PLC system can in time detect the system capacity surplus, started the battery charge function, and the less energy of the energy of lifting mechanism feedback and electrical generator 1 is converged the back to battery charge, stored all because the energy that potential energy produces.
1 group of general capacity of the diesel-engine generator that uses on RTG is all bigger, has considered the maximal work ability of system, and the general power that adopts of RTG is about 480KW.Because the equal constant speed of driving engine provides energy for electrical generator 1 in fully loaded and stand-by operation process, cause energy surplus in standby and underloading process, the phenomenon of driving engine over-emitting black exhaust when heavy duty hoists acceleration, both can't take into account, and must be cost to sacrifice fuel oil consumption.After adopting the batteries to store energy system, because offering the energy of RTG power circuit is hybrid power, system is controlled in very little power output to the energy requirement of driving engine, so remaining energy is provided by battery discharging, because the process of battery discharging is controlled by electronic switch, so sufficient energy can be provided rapidly, and response characteristic beats by miles 1 group of electrical generator, has improved the response characteristic of former electric power system greatly.
Native system driving engine total volume only needs 120KW, and wherein 50KW offers the ancillary system use, and all the other can offer power circuit and use.Therefore the energy that needs driving engine to provide when underloading or heavy duty is more or less the same, if original system adopts the diesel motor of Detroit S6063HK35:550HP, with not producing the overload mode of operation of over-emitting black exhaust, leaves very big surplus capacity.
After adopting the generating of 160HP diesel engine unit to replace original system, driving engine operates steadily, and in the time of in horsepower output is controlled at 100KW, each mechanism of RTG is smooth operation still, small generators 1 group system plays very important operation to whole energy, and the fractional energy savings when making standby surpasses 50%.
Storage battery can substitute energy-storage travelling wave tubes such as super capacitor as important energy-storage travelling wave tube.Be because novel storage battery has satisfied the basic demand of RTG system stored energy:
The first, storage battery has very big memory capacity, the energy in the time of can absorbing standby for a long time;
The second, storage battery has very big impulse electricity ability, can accept very big energy and input or output in moment;
Three, storage battery has long service life, can use 5 years under normal impulse electricity situation;
Four, storage battery has recyclable performance, and after storage battery was scrapped, material can also continue to utilize.
Obvious and common storage battery product has very big difference.The storage battery that native system adopts is the NiHM battery, it with the characteristic comparison of lead-acid battery, nickel-cadmium cell and lithium cell as Fig. 3, on power and energy density, the lithium cell optimum, secondly be the NiHM battery, be plumbic acid and nickel-cadmium cell then.Do not adopt the reason of lithium cell to have two:
The first, lithium cell has for a long time chain reaction of the danger of blast, particularly quantity, need do very perfect protection to lithium cell.
The second, lithium cell costs an arm and a leg, normally 3 of NiHM battery price times.
In order to overcome the defective of super capacitor system, improve the energy storage characteristic of new system, the energy storage content of system design is enough to the freight container of ten rated loads is risen to the extreme higher position from ground, require battery system 44 to have moment output simultaneously and reach 280KW power, satisfy the normal accelerating power of lift system.
In the process of the normal conveying container of RTG, storage battery needs to reach about 500 amperes to the electric current of dc bus discharge as calculated, and Fig. 4 is that curve falls in the time of storage battery when heavy-current discharge.Can satisfy 5 minutes fully with interior big electric current continuous discharge requirement.The charge characteristic of storage battery is similar to the characteristic of electric capacity, can bear big electric current and continue charging.
The life-span of storage battery can only be carried out discharging and recharging fully about 1000 times usually, if this number of times is used on the RTG, the user just must change battery everyday.By with storage battery manufacturer joint research, be equipped with the storage battery dedicated of enough capacity and by the strict control of PLC software accumulator capacity, just can reach 400,000 times not exclusively charge and discharge number of times.New accumulator just can satisfy the use of the busy harbour of operation about 4 years like this.
Because the operating voltage of storage battery is very high, therefore need a lot of battery packs to be together in series.Numerous battery packs is because the influence of environment may produce energy imbalances such as voltage, temperature, and this life-span for storage battery is influential.Adopt battery management device (BMS) can measure the mode of operation of each battery pack in real time, simultaneously can be according to the accumulative total of electric current I/O, the capacity of electric energy in the calculating accumulator accurately.Simultaneously carry out data exchange, make closed-centre system carry out Based Intelligent Control storage battery with the PLC controller.For example: when accumulator capacity is low, when the situation of standby, open the battery charge order, allow electrical generator 1 provide little electric current to charge.So both can replenish storage battery energy, not influence the RTG normal running again.
Batteries to store energy RTG control system synthesis two kinds of power save modes, can system realize the collection of energy of RTG in the decline process by mixing, its mass property makes system can store needs waste originally in the repeatedly decline process energy.
Can utilize simultaneously and mix the energy system can export enough energy when high-power demand characteristic, reach the dependence of reduction, adopt the puffer group can satisfy RTG equally and normally move powerplant module power.Can save under ideal case owing to the high energy dissipation that causes of big engine consumption.
The amount of energy saving of first kind of mode depends on the mechanical transfer efficient of RTG itself, comprising: the waste of power that external factors such as the transmission efficiency of pulley, gear etc. and friction produce.Mechanical transfer efficient is 0.9 in theory is calculated.Therefore the electric energy of potential energy decline generation is to promote 81% of this object power in theory.As seen energy-saving effect is tangible.
The amount of energy saving of the second way depends on 1 group of oil consumption of small generators own, before 1 group of replacement electrical generator, needs to determine the definite power demand of system that too big electrical generator will need more unloaded oil consumption for 1 group, cause waste.Improved rate of fuel consumption is also relevant with the capacity of 1 group of former electrical generator, if the surplus of 1 group of former electrical generator is very big, the fractional energy savings of then using instead after the small size motor group will be very high.
The effect of two kinds of characteristics of energy saving generations is different, and first kind of mode energy-saving effect under the condition of the busy more work of RTG is good more.Energy-conservation when therefore passing judgment on energy-saving effect and can not only compare standby and ignore energy-conservation when operating; Can not consider that heavy duty is energy-conservation and energy-conservation when ignoring underloading.After this closed-centre system adopts above-mentioned 2 kinds of energy saving technologys simultaneously, energy-conservation in the time of can taking into account the energy-conservation and standby when busy.
With above-mentioned foundation desirable embodiment of the present utility model is enlightenment, and by above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this utility model technological thought.The technical scope of this utility model is not limited to the content on the specification sheets, must determine its technical scope according to the claim scope.
Claims (4)
1. hybrid power RTG electric system, have electrical generator (1) and the rectifying device that is connected electrical generator (1) (2), rectifying device (2) changes source of AC into direct supply, by dc bus direct supply is offered converter plant (3), it is characterized in that: dc bus is provided with the energy exchange device, the energy exchange device comprises Programmable Logic Controller (41), be arranged on the boost pressure controller (42) on the dc bus, be connected the charging-discharging controller (43) on the dc bus between boost pressure controller (42) and the converter plant (3) and be connected battery system (44) on the charging-discharging controller (43), Programmable Logic Controller (41) is by fieldbus and boost pressure controller (42), charging-discharging controller (43) and battery system (44) carry out data exchange.
2. hybrid power RTG electric system according to claim 1 is characterized in that: the monitoring device (45) that the monitoring battery data are set on the described battery system (44).
3. hybrid power RTG electric system according to claim 1 is characterized in that: described battery system (44) comprises storage battery, state sensor, protective circuit, cooling channel device and battery management device.
4. hybrid power RTG electric system according to claim 3 is characterized in that: described storage battery is the NiHM battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202557387U CN201647835U (en) | 2009-11-26 | 2009-11-26 | Hybrid power RTG electrical system |
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| CN2009202557387U CN201647835U (en) | 2009-11-26 | 2009-11-26 | Hybrid power RTG electrical system |
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| CN201647835U true CN201647835U (en) | 2010-11-24 |
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| CN2009202557387U Ceased CN201647835U (en) | 2009-11-26 | 2009-11-26 | Hybrid power RTG electrical system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103253595A (en) * | 2012-02-16 | 2013-08-21 | 三一集团有限公司 | Power supply system of gantry crane, and gantry crane |
| CN104030165A (en) * | 2014-03-10 | 2014-09-10 | 天津港第四港埠有限公司 | An electronic control system of a portal slewing crane |
| CN104467093A (en) * | 2014-12-05 | 2015-03-25 | 常州基腾电气有限公司 | Hybrid power battery pack, electrical control system thereof, crane and system working method |
| CN104555742A (en) * | 2014-12-05 | 2015-04-29 | 常州基腾电气有限公司 | Hybrid power electrical control system, crane and working method |
| WO2016086872A1 (en) * | 2014-12-05 | 2016-06-09 | 深圳市安顺节能科技发展有限公司 | Dual-power energy-saving system for rubber tyred gantry crane |
| CN105668415A (en) * | 2016-04-01 | 2016-06-15 | 上海振华重工(集团)股份有限公司 | Power supply system and power supply switching method of container gantry crane |
| CN107128821A (en) * | 2017-06-19 | 2017-09-05 | 中车大连电力牵引研发中心有限公司 | Locomotive crane power drive system and locomotive crane |
| US11485615B2 (en) * | 2018-10-19 | 2022-11-01 | Paceco Corp. | Battery-powered rubber-tired gantry crane with onboard charging system |
-
2009
- 2009-11-26 CN CN2009202557387U patent/CN201647835U/en not_active Ceased
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103253595A (en) * | 2012-02-16 | 2013-08-21 | 三一集团有限公司 | Power supply system of gantry crane, and gantry crane |
| CN104030165A (en) * | 2014-03-10 | 2014-09-10 | 天津港第四港埠有限公司 | An electronic control system of a portal slewing crane |
| CN104467093A (en) * | 2014-12-05 | 2015-03-25 | 常州基腾电气有限公司 | Hybrid power battery pack, electrical control system thereof, crane and system working method |
| CN104555742A (en) * | 2014-12-05 | 2015-04-29 | 常州基腾电气有限公司 | Hybrid power electrical control system, crane and working method |
| WO2016086872A1 (en) * | 2014-12-05 | 2016-06-09 | 深圳市安顺节能科技发展有限公司 | Dual-power energy-saving system for rubber tyred gantry crane |
| CN105668415A (en) * | 2016-04-01 | 2016-06-15 | 上海振华重工(集团)股份有限公司 | Power supply system and power supply switching method of container gantry crane |
| CN107128821A (en) * | 2017-06-19 | 2017-09-05 | 中车大连电力牵引研发中心有限公司 | Locomotive crane power drive system and locomotive crane |
| US11485615B2 (en) * | 2018-10-19 | 2022-11-01 | Paceco Corp. | Battery-powered rubber-tired gantry crane with onboard charging system |
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Decision date of declaring invalidation: 20191104 Decision number of declaring invalidation: 42147 Granted publication date: 20101124 |
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