CN114566992A - Lithium battery feedback energy storage peak clipping device of rubber-tyred gantry crane - Google Patents
Lithium battery feedback energy storage peak clipping device of rubber-tyred gantry crane Download PDFInfo
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- CN114566992A CN114566992A CN202210224397.7A CN202210224397A CN114566992A CN 114566992 A CN114566992 A CN 114566992A CN 202210224397 A CN202210224397 A CN 202210224397A CN 114566992 A CN114566992 A CN 114566992A
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- lithium battery
- energy storage
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- gantry crane
- rubber
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/12—Arrangements of means for transmitting pneumatic, hydraulic, or electric power to movable parts of devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a lithium battery feedback energy storage peak clipping device of a tyre type gantry crane, which comprises: the energy storage type lithium battery pack comprises a power type lithium battery, a DCDC converter corresponding to the power type lithium battery, at least one energy storage type lithium battery, a DCDC converter corresponding to the energy storage type lithium battery one by one and a controller; the power type lithium battery is connected with a frequency converter direct current bus of the rubber-tyred gantry crane through a corresponding DCDC converter; the energy storage type lithium battery is connected with the direct current bus of the frequency converter through a corresponding DCDC converter; the controller is connected with the power lithium battery and the energy storage lithium battery and used for controlling the charging and discharging of the power lithium battery and the energy storage lithium battery. The lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane, disclosed by the invention, provides seamless power switching of the rubber-tyred gantry crane based on the lithium battery, and effectively improves the recycling efficiency of the descent potential energy of the rubber-tyred gantry crane.
Description
Technical Field
The invention relates to the technical field of a rubber-tyred gantry crane (RTG), in particular to a lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane.
Background
A rubber tyred gantry crane (RTG crane) is used for moving the gantry crane in an intermodal operation to the ground or a stacked container. The warehoused containers are stored for pick-up by haul trucks and the outbound containers are stored for loading onto the vessel. RTG cranes typically span multiple lanes, one of which is reserved for container transfer and has great mobility.
At present, a large amount of diesel oil is adopted for generating electricity and supplying power for port mobile equipment. Although many docks have performed "oil to electricity" over the years, the "oil to electricity" limits the flexibility of the plant, so the plant still retains the diesel gensets to maintain its flexibility. With the further advance of energy conservation and emission reduction, the mobile equipment needs to be driven by full electricity without reducing the flexibility.
In the prior art, all energy required by an RTG crane for lifting heavy objects needs to be supplied with power from a trolley line, the peak power is more than 300KW when heavy load is lifted and accelerated, and the power is only about 40KW when a trolley walks after lifting is finished. When heavy load is lowered, potential energy feedback power of about 170KW needs to be fed back to the mains supply or is consumed through heating of an energy consumption resistor, and an RTG power supply is generated by a diesel generator set on the RTG crane to realize walking to another trolley line power supply area.
Because the wharf has a plurality of irregular storage tank areas without commercial power trolley line systems, the RTG crane can only use a diesel generator set on the RTG crane to generate electricity when operating in the areas, and the potential energy can only be consumed through energy consumption resistors when the diesel generator set is used for generating electricity.
In addition, the capacity of the commercial power supply and distribution transformer and the capacity of the power supply trolley line are limited, so that the number of container gantry cranes for accommodating operation in the same commercial power trolley line is limited. Along with the development of ports, the quantity of container gantry cranes which are required to operate simultaneously in the same commercial power trolley line needs to be expanded.
Therefore, how to fully utilize the electric energy of the rubber-tyred gantry crane becomes a current hot research topic.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide a lithium battery feedback energy storage peak clipping device for a tire type gantry crane, which provides seamless power switching for the tire type gantry crane based on lithium batteries, and effectively improves the recycling efficiency of the descent potential energy of the tire type gantry crane.
In order to achieve the above and other related objects, the present invention provides a lithium battery feedback energy storage peak clipping device for a tire type gantry crane, comprising: the energy storage type lithium battery pack comprises a power type lithium battery, a DCDC converter corresponding to the power type lithium battery, at least one energy storage type lithium battery, a DCDC converter corresponding to the energy storage type lithium battery one by one and a controller; the power type lithium battery is connected with a frequency converter direct current bus of the rubber-tyred gantry crane through a corresponding DCDC converter; the energy storage type lithium battery is connected with the direct current bus of the frequency converter through a corresponding DCDC converter; the controller is connected with the power lithium battery and the energy storage lithium battery and used for controlling charging and discharging of the power lithium battery and the energy storage lithium battery so that the rubber-tyred gantry crane is powered on the basis of commercial power or the power lithium battery and the energy storage lithium battery.
In an embodiment of the invention, in a power utilization peak area or an area without a commercial power trolley line, the controller selects to supply power based on the power lithium battery and the energy storage lithium battery; in the electricity utilization valley region, the controller selects to supply electricity based on the commercial power.
In an embodiment of the invention, when the rubber-tyred gantry crane takes electricity from the mains supply, the controller controls the mains supply direct current trolley line to be connected with the frequency converter; when the rubber-tyred gantry crane is lifted, the controller controls the power lithium battery to discharge and controls the energy storage lithium battery to stop charging; when the suspended load of the rubber-tyred gantry crane descends, the controller controls the power lithium battery and the energy storage lithium battery to be charged; and when the rubber-tyred gantry crane does not perform lifting action, the controller controls the power lithium battery and the energy storage lithium battery to be charged.
In an embodiment of the present invention, when the controller controls the power lithium battery and the energy storage lithium battery to charge, the charging current of the energy storage lithium battery is controlled to be a smaller value of 0.2 times of the rated current of the battery and 0.8 times of the actually allowed charging current; controlling the power lithium battery to start charging only after the SOC value of the electric quantity of the energy storage lithium battery is larger than 85%; the total charging current of the power lithium battery and the energy storage lithium battery is not more than 150A, and the charging is finished after the power lithium battery is charged to 80% of electric quantity and the energy storage lithium battery is charged to 100% of electric quantity.
In an embodiment of the invention, when the wheeled gantry crane does not take electricity from the mains supply, the controller controls the power lithium battery and the energy storage lithium battery to discharge; when the heavy load of the rubber-tyred gantry crane rises, the energy storage lithium battery only provides part of power required by the lifting, and the power lithium battery provides the rest required power; when the tire type gantry crane descends, the energy storage type lithium battery is not charged, and the power type lithium battery is charged to realize descending potential energy recovery.
In an embodiment of the present invention, when the power lithium battery and the energy storage lithium battery are controlled to discharge, the controller controls a discharge current limit value of the energy storage lithium battery to be 0.2 times of a rated current of the battery, and a charge current limit value is set to be 0; and controlling the discharge current limit value of the power lithium battery to be 5 times of the rated current of the battery.
In an embodiment of the present invention, when the rubber-tyred gantry crane is powered by a direct current commercial power trolley line, the rubber-tyred gantry crane further includes a complete machine auxiliary system power inverter, one end of which is connected to the complete machine auxiliary power supply, and the other end of which is connected to the direct current bus of the frequency converter.
In an embodiment of the invention, when the rubber-tyred gantry crane is powered by an alternating current commercial power trolley line, the rubber-tyred gantry crane further comprises a complete machine auxiliary system power inverter, an emergency change-over switch and a linkage contactor; the first end of the complete machine auxiliary system power inverter is connected with the direct-current bus of the frequency converter, the second end of the complete machine auxiliary system power inverter is connected with the first end of the interlocking contactor, and the third end of the complete machine auxiliary system power inverter is connected with the first selection end of the emergency change-over switch; the second end of the interlocking contactor is connected with an alternating current commercial power sliding contact line; and a second selection end of the emergency change-over switch is connected with a second end of the interlocking contactor, and an input end of the emergency change-over switch is connected with an auxiliary power supply of the whole machine.
In an embodiment of the invention, when the rubber-tyred gantry crane gets electricity from the mains supply, the controller controls the mains supply direct current trolley line to be connected with the frequency converter, and the interlocking contactor is disconnected; when the rubber-tyred gantry crane does not take power from the mains supply, the controller controls the disconnection of the mains supply direct current trolley line and the frequency converter.
In an embodiment of the present invention, when the power inverter of the complete machine auxiliary system fails, the first selection terminal and the second selection terminal of the emergency switch are disconnected; when the complete machine auxiliary system power inverter is normal, the first selection end and the second selection end of the emergency change-over switch are closed, and the interlocking contactor is closed.
As mentioned above, the lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane has the following beneficial effects:
(1) the power seamless switching of the rubber-tyred gantry crane is provided based on the lithium battery, so that the recycling efficiency of the descending potential energy of the rubber-tyred gantry crane is effectively improved;
(2) when the rubber-tyred gantry crane is lifted, the lifting energy is supplied by lithium batteries, so that the peak current obtained from the urban network trolley lines is reduced, and the peak current of each rubber-tyred gantry crane is reduced, so that the quantity of the rubber-tyred gantry cranes which operate simultaneously in the trolley lines can be increased without modifying the power supply and distribution and the trolley lines;
(3) the electric power vehicle can flexibly transit without a diesel generating set, the operation in the area without commercial power sliding contact lines is realized, the electric power vehicle is charged in the valley time period and discharged in the peak time period and the peak time period, the cost of the electric power vehicle is greatly reduced, the normal operation of the rubber-tyred gantry crane is not influenced, and the pure zero carbon emission of the rubber-tyred gantry crane for the wharf is realized.
Drawings
Fig. 1 is a schematic structural diagram of a lithium battery feedback energy storage peak clipping device of a rubber-tyred gantry crane powered by a direct-current commercial power trolley line in an embodiment of the invention;
fig. 2 is a schematic structural diagram of a lithium battery feedback energy storage peak clipping device of a tyre gantry crane powered by an ac commercial power trolley line in another embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane provides seamless power switching of the rubber-tyred gantry crane based on the lithium battery, effectively improves the recycling efficiency of the drop potential energy of the rubber-tyred gantry crane, can flexibly switch without a diesel generator set, realizes the operation in the area without commercial power sliding contact lines, charges in the low-ebb time period and discharges in the peak time period and the peak time period, greatly reduces the cost of an electric vehicle, and has high practicability.
In an embodiment, the lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane comprises a power lithium battery, a DCDC converter corresponding to the power lithium battery, at least one energy storage lithium battery, a DCDC converter corresponding to the energy storage lithium battery one by one, and a controller. And the power type lithium battery is connected with a frequency converter direct current bus of the tire type gantry crane through a corresponding DCDC converter. And the energy storage type lithium battery is connected with the direct current bus of the frequency converter through a corresponding DCDC converter. The controller is connected with the power lithium battery and the energy storage lithium battery and used for controlling charging and discharging of the power lithium battery and the energy storage lithium battery so that the rubber-tyred gantry crane is powered on the basis of commercial power or the power lithium battery and the energy storage lithium battery.
As shown in fig. 1, the lithium battery feedback energy storage peak clipping device for the tire type gantry crane powered by the direct current commercial power trolley line includes a power type lithium battery 101, a DCDC converter 102 corresponding to the power type lithium battery, at least one energy storage type lithium battery (in this embodiment, three energy storage type lithium batteries 103, 104, and 105 are provided), DCDC converters (106, 107, and 108) corresponding to the energy storage type lithium batteries one to one, and a controller 109.
The power lithium battery 101 is connected with a frequency converter direct current bus of the tire type gantry crane through a corresponding DCDC converter 102. Preferably, the power lithium battery 101 is a lithium titanate battery.
The energy storage type lithium batteries 103, 104 and 105 are connected with the direct current bus of the frequency converter through corresponding DCDC converters 106, 107 and 108. Preferably, the energy storage lithium batteries 103, 104 and 105 adopt lithium iron phosphate batteries.
The controller 109 is connected to the power lithium battery 101 and the energy storage lithium batteries 103, 104 and 105, and is configured to control charging and discharging of the power lithium battery 101 and the energy storage lithium batteries 103, 104 and 105, so that the tire type gantry crane supplies power based on the commercial power or the power lithium battery 101 and the energy storage lithium batteries 103, 104 and 105. Preferably, the controller 109 employs a PLC or a CPU.
Preferably, the lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane powered by the direct-current commercial power trolley line further comprises a complete machine auxiliary system power inverter 110, one end of which is connected with the complete machine auxiliary power supply, and the other end of which is connected with the direct-current bus of the frequency converter.
Specifically, in a power utilization peak area or an area without commercial power trolley lines, the controller selects power supply based on the power lithium battery and the energy storage lithium battery; in the electricity consumption valley region, the controller selects to supply electricity based on commercial power, thereby realizing the time-sharing electricity consumption, reducing the electric power cost, realizing the operation in the region without commercial power sliding contact lines and ensuring the flexible and effective work of the rubber-tyred gantry crane.
As shown in fig. 1, for the working condition 1, that is, when the rubber-tyred gantry crane takes power from the commercial power, the controller 109 controls the commercial power dc trolley line power contactor 111 to be closed, so that the commercial power dc trolley line is connected to the frequency converter. When the rubber-tyred gantry crane is lifted, the controller receives an RTG (real time clock) lifting operation signal, controls the power lithium battery 101 to discharge through the corresponding DCDC converter 102, supplements the power of the trolley line of the urban network, and accordingly reduces the peak current of the rubber-tyred gantry crane for taking electricity from the trolley line; and simultaneously controlling the energy storage type lithium batteries 103, 104 and 105 to stop charging. When the suspended load of the rubber-tyred gantry crane is reduced, the controller charges the power lithium battery 101 and the energy storage lithium batteries 103, 104 and 105 through 4 DCDC converters, so that the reduced potential energy is directly fed back to the batteries. When the rubber-tyred gantry crane does not perform lifting action, the controller does not receive an RTG (real time clock) lifting operation signal, and the controller charges the power lithium battery 101 and the energy storage lithium batteries 103, 104 and 105 through 4 DCDC (direct current/direct current) converters.
Preferably, when the controller controls the power lithium battery and the energy storage lithium battery to charge, the controller controls the charging current of the energy storage lithium battery to be the smaller value of 0.2 times of the rated current of the battery and 0.8 times of the actually allowed charging current. The total charging current of the power lithium battery and the energy storage lithium battery is not more than 150A. According to the charge-discharge characteristics of the energy storage lithium battery and the power lithium battery, when the SOC of the electric quantity of the energy storage lithium battery is less than 85%, the allowable charging current of the power lithium battery is 5 times of the rated current of the power lithium battery within the range of the SOC 90%, and the power lithium battery can be fully charged to 80% within 6 minutes. Thus, the movement of the movable member; and controlling the power lithium battery to start charging only when the SOC value of the electric quantity of the energy storage lithium battery is greater than 85%, and finishing charging when the power lithium battery is charged to 80% of the electric quantity and the energy storage lithium battery is charged to 100% of the electric quantity.
For the working condition 2, namely when the rubber-tyred gantry crane does not take power from the mains supply, the controller 109 controls the commercial supply direct current trolley line power supply contactor 111 to be disconnected, so that the power taking from the mains supply is stopped; and controls the power lithium battery 101 and the energy storage lithium batteries 103, 104 and 105 to discharge, thereby realizing battery power supply. When the heavy load of the rubber-tyred gantry crane rises, the energy storage lithium battery only provides part of power required by the lifting, and the power lithium battery provides the rest required power; when the tire type gantry crane descends, the energy storage type lithium batteries 103, 104 and 105 are not charged, and the power type lithium battery 101 is charged to realize descending potential energy recovery.
Preferably, when the power lithium battery and the energy storage lithium battery are controlled to discharge, the controller controls the discharge current limit value of the energy storage lithium battery to be 0.2 times of the rated current of the battery, and the charge current limit value is set to be 0; and controlling the discharge current limit value of the power lithium battery to be 5 times of the rated current of the battery.
Therefore, the controller can realize the switching between the mains supply and the battery supply by controlling the mains supply direct current sliding contact line power supply contactor, namely the switching between the working condition 1 and the working condition 2. Specifically, the controller automatically controls the rubber-tyred gantry crane to charge the battery in the valley power time period according to the policy of 'peak-valley electricity price' at the wharf location, and automatically switches the rubber-tyred gantry crane to use the battery for power supply operation in the peak power time period. Meanwhile, when the rubber-tyred gantry crane needs to be transferred from one section of commercial power trolley line area to another section of area or works in the area without the commercial power trolley line, the switching between commercial power supply and battery power supply can be realized by only controlling the commercial power direct-current trolley line power contactor.
As shown in fig. 2, the lithium battery feedback energy storage peak clipping device of the tire type gantry crane powered by the direct current commercial power trolley line comprises a power type lithium battery 201, a DCDC converter 202 corresponding to the power type lithium battery, at least one energy storage type lithium battery (203, 204 and 205), DCDC converters (206, 207 and 208) corresponding to the energy storage type lithium batteries one by one, and a controller 209.
The power type lithium battery 201 is connected with a frequency converter direct current bus of the tire type gantry crane through a corresponding DCDC converter 202.
The energy storage lithium batteries 203, 204 and 205 are connected with the direct current bus of the frequency converter through corresponding DCDC converters 206, 207 and 208.
The controller 209 is connected to the power lithium battery 201 and the energy storage lithium batteries 203, 204 and 205, and is configured to control charging and discharging of the power lithium battery 201 and the energy storage lithium batteries 203, 204 and 205, so that the rubber-tyred gantry crane supplies power based on the commercial power or the power lithium battery 201 and the energy storage lithium batteries 203, 204 and 205. Preferably, the controller 209 employs a PLC or a CPU.
In an embodiment of the present invention, the lithium battery feedback energy storage peak clipping device of the tire type gantry crane powered by the direct current commercial power trolley line further includes a complete machine auxiliary system power inverter 210, an emergency switch 211, and a chain contactor 212. A first end of the complete machine auxiliary system power inverter 210 is connected with the direct-current bus of the frequency converter, a second end of the complete machine auxiliary system power inverter is connected with a first end of the interlocking contactor 212, and a third end of the complete machine auxiliary system power inverter is connected with a first selection end of the emergency selector switch 211; the second end of the interlocking contactor 212 is connected with an alternating current commercial power sliding contact line; the second selection end of the emergency switch 211 is connected with the second end of the interlocking contactor 212, and the input end is connected with the auxiliary power supply of the whole machine.
Specifically, when the rubber-tyred gantry crane gets electricity from the mains supply, the controller controls the mains supply direct current trolley line to be connected with the frequency converter, and the interlocking contactor is disconnected to prevent circulation. At this time, the specific operation principle is as the above-mentioned operating condition 1. When the rubber-tyred gantry crane does not take power from the mains supply, the controller controls the disconnection of the mains supply direct current trolley line and the frequency converter, so that the rubber-tyred gantry crane enters the working condition 2.
When the complete machine auxiliary system power inverter breaks down, the first selection end and the second selection end of the emergency change-over switch are disconnected, and therefore the commercial power supply work is achieved. When the complete machine auxiliary system power inverter is normal, the first selection end and the second selection end of the emergency change-over switch are closed, and the interlocking contactor is closed, so that the complete machine auxiliary power supply supplies power to the complete machine auxiliary system power inverter.
In conclusion, the lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane provides seamless power switching of the rubber-tyred gantry crane based on the lithium battery, and effectively improves the recycling efficiency of the descent potential energy of the rubber-tyred gantry crane; when the rubber-tyred gantry crane is lifted, the lifting energy is supplied by lithium batteries, so that the peak current obtained from the urban network trolley lines is reduced, and the peak current of each rubber-tyred gantry crane is reduced, so that the quantity of the rubber-tyred gantry cranes which operate simultaneously in the trolley lines can be increased without modifying the power supply and distribution and the trolley lines; the electric power vehicle can flexibly transit without a diesel generating set, the operation in the area without commercial power sliding contact lines is realized, the electric power vehicle is charged in the valley time period and discharged in the peak time period and the peak time period, the cost of the electric power vehicle is greatly reduced, the normal operation of the rubber-tyred gantry crane is not influenced, and the pure zero carbon emission of the rubber-tyred gantry crane for the wharf is realized. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a tire formula gantry crane lithium cell repayment energy storage peak clipping device which characterized in that: the method comprises the following steps: the energy storage type lithium battery power supply comprises a power type lithium battery, a DCDC converter corresponding to the power type lithium battery, at least one energy storage type lithium battery, a DCDC converter and a controller, wherein the DCDC converter and the controller are in one-to-one correspondence with the energy storage type lithium battery;
the power type lithium battery is connected with a frequency converter direct current bus of the rubber-tyred gantry crane through a corresponding DCDC converter;
the energy storage type lithium battery is connected with the direct current bus of the frequency converter through a corresponding DCDC converter;
the controller is connected with the power lithium battery and the energy storage lithium iron battery and used for controlling charging and discharging of the power lithium battery and the energy storage lithium battery so that the rubber-tyred gantry crane is powered on the basis of commercial power or the power lithium battery and the energy storage lithium battery.
2. The lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane according to claim 1, wherein: in a power utilization peak area or an area without commercial power sliding contact lines, the controller selects power supply based on the power lithium battery and the energy storage lithium battery; in the electricity utilization valley region, the controller selects to supply electricity based on the commercial power.
3. The lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane according to claim 1, wherein: when the rubber-tyred gantry crane gets electricity from the mains supply, the controller controls the mains supply direct current trolley line to be connected with the frequency converter; when the rubber-tyred gantry crane is lifted, the controller controls the power lithium battery to discharge and controls the energy storage lithium battery to stop charging; when the suspended load of the rubber-tyred gantry crane descends, the controller controls the power lithium battery and the energy storage lithium battery to be charged; and when the rubber-tyred gantry crane does not perform lifting action, the controller controls the power lithium battery and the energy storage lithium battery to be charged.
4. The lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane according to claim 3, wherein: when the controller controls the power lithium battery and the energy storage lithium battery to charge, the charging current of the energy storage lithium battery is controlled to be the smaller value of 0.2 times of the rated current of the battery and 0.8 times of the actually allowed charging current; controlling the power lithium battery to start charging only after the SOC value of the electric quantity of the energy storage lithium battery is larger than 85%; the total charging current of the power lithium battery and the energy storage lithium battery is not more than 150A, and the charging is finished after the power lithium battery is charged to 80% of electric quantity and the energy storage lithium battery is charged to 100% of electric quantity.
5. The lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane according to claim 1, wherein: when the rubber-tyred gantry crane does not take electricity from the mains supply, the controller controls the power lithium battery and the energy storage lithium battery to discharge; when the heavy load of the rubber-tyred gantry crane rises, the energy storage lithium battery only provides part of power required by the lifting, and the power lithium battery provides the rest required power; when the tire type gantry crane descends, the energy storage type lithium battery is not charged, and the power type lithium battery is charged to realize descending potential energy recovery.
6. The lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane according to claim 5, wherein: when the power lithium battery and the energy storage lithium battery are controlled to discharge, the controller controls the discharge current limit value of the energy storage lithium battery to be 0.2 times of the rated current of the battery, and the charging current limit value is set to be 0; and controlling the discharge current limit value of the power lithium battery to be 5 times of the rated current of the battery.
7. The lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane according to claim 1, wherein: when the rubber-tyred gantry crane is powered by a direct-current commercial power trolley line, the rubber-tyred gantry crane further comprises a complete machine auxiliary system power inverter, one end of the complete machine auxiliary system power inverter is connected with a complete machine auxiliary power supply, and the other end of the complete machine auxiliary system power inverter is connected with the direct-current bus of the frequency converter.
8. The lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane according to claim 1, wherein: when the rubber-tyred gantry crane is powered by an alternating current commercial power sliding contact line, the rubber-tyred gantry crane further comprises a complete machine auxiliary system power inverter, an emergency change-over switch and a linkage contactor; the first end of the complete machine auxiliary system power inverter is connected with the direct-current bus of the frequency converter, the second end of the complete machine auxiliary system power inverter is connected with the first end of the interlocking contactor, and the third end of the complete machine auxiliary system power inverter is connected with the first selection end of the emergency change-over switch; the second end of the interlocking contactor is connected with an alternating current commercial power sliding contact line; and a second selection end of the emergency change-over switch is connected with a second end of the interlocking contactor, and an input end of the emergency change-over switch is connected with an auxiliary power supply of the whole machine.
9. The lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane according to claim 8, wherein: when the rubber-tyred gantry crane gets electricity from the mains supply, the controller controls the mains supply direct current sliding contact line to be connected with the frequency converter, and the interlocking contactor is disconnected; when the rubber-tyred gantry crane does not take power from the mains supply, the controller controls the disconnection of the mains supply direct current trolley line and the frequency converter.
10. The lithium battery feedback energy storage peak clipping device of the rubber-tyred gantry crane according to claim 1, wherein: when the power inverter of the complete machine auxiliary system fails, the first selection end and the second selection end of the emergency change-over switch are disconnected; when the complete machine auxiliary system power inverter is normal, the first selection end and the second selection end of the emergency change-over switch are closed, and the interlocking contactor is closed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117446667A (en) * | 2023-11-27 | 2024-01-26 | 常州基腾电气有限公司 | Tire crane control system with battery transfer function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117446667A (en) * | 2023-11-27 | 2024-01-26 | 常州基腾电气有限公司 | Tire crane control system with battery transfer function |
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