Novel container wharf RTG safety protection device

Abstract

The utility model discloses a novel container wharf RTG safety protection device which comprises a direct current bus and an RTG general control PLC module, the direct current bus is connected with a rectification boost module, a large power frequency converter, a first DC / AC frequency converter, a second DC / AC frequency converter and a brake unit, the rectification boost module is connected with a diesel generator and an auxiliary power supply system, and the large power frequency converter is connected with a second DC / AC frequency converter. The diesel generator is connected with the auxiliary power supply system, the braking unit is connected with a power energy storage system, the power energy storage system is connected with one of a DC / AC inverter and a DC / DC frequency converter, and the RTG general control PLC module controls the rectification boosting module, the high-power frequency converter and the first DC / AC frequency converter. According to the novel container wharf RTG safety protection device, a power energy storage system with high power and small energy is adopted, a discharge resistor is directly replaced, all energy is recycled when a container descends, the oil saving rate is basically the same as that of oil-electricity hybrid power, but the improvement cost is far lower than that of an oil-electricity hybrid power mode.

Description

Technical Field

[0001] The utility model relates to the field of RTG safety protection at a container terminal, and in particular to a novel RTG safety protection device at a container terminal. Background Art

[0002] The RTG safety protection device at the container terminal is a supporting device for RTG safety protection. The traditional RTG is powered by a diesel generator. When the container is lowered, the lifting motor reverses to generate electrical energy that is fed back to the DC bus, causing the voltage to rise. When the DC bus voltage reaches the set voltage value (generally above 720VDC) of the BDU (control unit, whose function is to consume the regenerative energy generated by the motor during deceleration or reversal in the form of heat energy on the brake resistor) to open, the bus voltage is directly connected to the discharge resistor to consume it in the form of heat until the bus voltage drops to the set value of the BDU closing (generally around 680VDC). The built-in RTG (the container is lowered to consume energy through the resistor) is equivalent to the brake protection device when driving. It is the RTG that ensures that the bus voltage is controlled within a certain range to protect the safety of various types of input motors. With the continuous development of science and technology, people have higher and higher requirements for the safety, energy saving and environmental protection of the RTG safety protection device at the container terminal.

[0003] The existing RTG safety protection device for container terminals has certain drawbacks when used, wasting energy (diesel) and causing serious environmental pollution. For this reason, some people also use hybrid power, that is, adding a battery pack system (generally using supercapacitors, batteries, flywheels, etc.), directly connected to the DC bus through a bidirectional high-power DC / DC inverter, and providing power together with the original diesel generator set when the container rises; when the container descends, the power storage system recovers all or part of the energy when the container is lowered (if the energy of the container cannot be recovered in time, the excess energy will be consumed in the form of heat by connecting the resistor), which can also achieve energy-saving effects, but the system is complex and the cost of transformation is high (RMB1.5 million to 5 million). For this reason, we propose a new type of RTG safety protection device for container terminals. Utility Model Content

[0004] Technical problems solved: In view of the deficiencies in the prior art, the utility model provides a novel RTG safety protection device for container terminals, which adopts a high-power and low-energy power storage system to directly replace the discharge resistor and recover all energy when the container is lowered. The fuel saving rate is basically the same as that of the oil-electric hybrid power, but the transformation cost is much lower than that of the oil-electric hybrid power, which can effectively solve the problems in the background technology.

[0005] Technical solution: To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a new type of RTG safety protection device for container terminals, including a DC bus and an RTG master control PLC module, the DC bus is connected to a rectifier and boost module, a high-power inverter, a first DC / AC inverter, a second DC / AC inverter and a braking unit, the rectifier and boost module is connected to a diesel generator and an auxiliary power supply system, the diesel generator is connected to the auxiliary power supply system, the braking unit is connected to a power storage system, and the power storage system is connected to one of a DC / AC inverter and a DC / DC inverter.

[0006] Preferably, the RTG master control PLC module controls the working conditions of the rectifier boost module, the high-power inverter, the first DC / AC inverter, the second DC / AC inverter, the braking unit and the power energy storage system.

[0007] Preferably, the high-power inverter is connected to a lifting motor, the first DC / AC inverter is connected to a trolley motor, and the second DC / AC inverter is connected to a small trolley motor.

[0008] Preferably, two structures are included. In the first structure, the DC / AC inverter is directly connected to the power consumption site.

[0009] Preferably, in the second structure, the DC / AC inverter is converted into a DC / DC converter, the DC / DC converter is connected to the DC bus, and the DC / DC converter is controlled by the RTG master control PLC module.

[0010] Preferably, the output end of the diesel generator is connected to the auxiliary power supply system and the input end of the rectifier and boost module, the output end of the rectifier and boost module is connected to the input end of the DC bus, and the DC bus is bidirectionally connected to the high-power inverter, the first DC / AC inverter and the second DC / AC inverter.

[0011] Beneficial effects: Compared with the prior art, the utility model provides a new RTG safety protection device for container terminals, which has the following beneficial effects: This new RTG safety protection device for container terminals adopts a high-power and low-energy power storage system to directly replace the discharge resistor, and recovers all energy when the container is lowered. The fuel saving rate is basically the same as that of the oil-electric hybrid power, but the transformation cost is much lower than that of the oil-electric hybrid power. The entire RTG safety protection device for container terminals has a simple structure and is easy to operate. The effect of use has obvious advantages over traditional methods and is better than that of the oil-electric hybrid power. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural schematic diagram of the first solution of a new type of RTG safety protection device for container terminals in the utility model.

[0013] Figure 2 This is a structural schematic diagram of the second solution of a new type of RTG safety protection device for container terminals in the utility model.

[0014] Figure 3 This is a schematic diagram of the working condition of hoisting a container onto a truck in a new type of RTG safety protection device for a container terminal according to the utility model.

[0015] Figure 4 The utility model is a schematic diagram of the working condition of unloading containers from a truck in a new type of RTG safety protection device for a container terminal.

[0016] In the figure: 1. DC bus; 2. Auxiliary power supply system; 3. Diesel generator; 4. High-power inverter; 5. Lifting motor; 6. Rectifier and boost module; 7. RTG master control PLC module; 8. First DC / AC inverter; 9. Carriage motor; 10. Second DC / AC inverter; 11. Trolley motor; 12. Power storage system; 13. Braking unit; 14. DC / AC inverter; 15. Power consumption place; 16. DC / DC inverter. DETAILED DESCRIPTION

[0017] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are part of the embodiments of the utility model, rather than all of the embodiments, and are only used to illustrate the utility model, and should not be considered as limiting the scope of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the utility model. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] like Figure 1-2 As shown, a novel RTG safety protection device for container terminals includes a DC bus 1 and an RTG master control PLC module 7, the DC bus 1 is connected to a rectifier boost module 6, a high-power inverter 4, a first DC / AC inverter 8, a second DC / AC inverter 10 and a brake unit 13, the rectifier boost module 6 is connected to a diesel generator 3 and an auxiliary power supply system 2, the diesel generator 3 is connected to the auxiliary power supply system 2, the brake unit 13 is connected to a power storage system 12, the power storage system 12 is connected to one of a DC / AC inverter 14 and a DC / DC inverter 16, a high-power and low-energy power storage system is used to directly replace the discharge resistor, and all energy is recovered when the container is lowered, and the fuel saving rate is basically the same as that of the oil-electric hybrid power, but the transformation cost is much lower than that of the oil-electric hybrid power.

[0021] Furthermore, the RTG master control PLC module 7 controls the working conditions of the rectifier boost module 6 , the high-power inverter 4 , the first DC / AC inverter 8 , the second DC / AC inverter 10 , the braking unit 13 and the power energy storage system 12 .

[0022] Furthermore, the high-power inverter 4 is connected to the lifting motor 5 , the first DC / AC inverter 8 is connected to the trolley motor 9 , and the second DC / AC inverter 10 is connected to the trolley motor 11 .

[0023] Furthermore, two structures are included. In the first structure, the DC / AC inverter 14 is directly connected to the power consumption site 15 .

[0024] Furthermore, in the second structure, the DC / AC inverter 14 is converted into a DC / DC converter 16 , the DC / DC converter 16 is connected to the DC bus 1 , and the DC / DC converter 16 is controlled by the RTG master control PLC module 7 .

[0025] Furthermore, the output end of the diesel generator 3 is connected to the auxiliary power supply system 2 and the input end of the rectifier boost module 6, the output end of the rectifier boost module 6 is connected to the input end of the DC bus 1, and the DC bus 1 is bidirectionally connected to the high-power inverter 4, the first DC / AC inverter 8 and the second DC / AC inverter 10.

[0026] like Figure 3 , 4 As shown, the maximum output power of RTG lifting containers is 200kW, the bus voltage is generally 680VDC, the maximum current is about 300A, the maximum energy required for rising is 2.5kWh, and the maximum energy that can be recovered during lowering does not exceed 2kWh.

[0027] Working principle: The utility model includes a DC bus 1, an auxiliary power supply system 2, a diesel generator 3, a high-power inverter 4, a lifting motor 5, a rectifier boost module 6, an RTG master control PLC module 7, a first DC / AC inverter 8, a trolley motor 9, a second DC / AC inverter 10, a small trolley motor 11, a power storage system 12, a braking unit 13, a DC / AC inverter 14, a power consumption site 15 and a DC / DC inverter 16. It adopts a high-power and low-energy power storage system to directly replace the discharge resistor. When the container is lowered, all energy is recovered. The fuel saving rate is basically the same as that of the oil-electric hybrid power, but the transformation cost is much lower than that of the oil-electric hybrid power.

[0028] The heaviest container lifted by RTGs used in general terminals is 40 tons. The power required to lower a 40-ton container can reach over 200kW. The energy required to lower a recyclable container does not exceed 2kWh. During busy hours, a maximum of 20 containers can be lifted per hour, or one container every 3 minutes.

[0029] Solution 1 uses a 200kW7.5kWh power energy storage system (theoretically, to double the energy, only 2kWh*2=4kWh is needed. Considering that the input power needs to reach 200kW, a 7.5kWh energy storage system is used, which can reach a maximum input power of 225kW) and a 60kWDC / AC inverter to recycle all the energy when the container is lowered, and 2kWh of electricity can be discharged within 2 minutes;

[0030] Option 2 uses a 200kW7.5kWh power storage system (a hybrid RTG generally requires an 18-50kWh power storage system) and a 200kW unidirectional DC / DC inverter (a hybrid RTG generally requires a 600kW bidirectional high-power DC / DC inverter) to recover all the energy when the container is lowered. When the container is raised, the energy in the power storage system is used first, and if it is insufficient, it is provided by the diesel generator set.

[0031] It should be noted that, in this article, relational terms such as first and second (number one, number two), etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0032] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A novel RTG safety protection device for a container terminal, comprising a DC bus (1) and an RTG master control PLC module (7), characterized in that: The DC bus (1) is connected to a rectifier and boost module (6), a high-power inverter (4), a first DC / AC inverter (8), a second DC / AC inverter (10) and a brake unit (13); the rectifier and boost module (6) is connected to a diesel generator (3) and an auxiliary power supply system (2); the diesel generator (3) is connected to the auxiliary power supply system (2); the brake unit (13) is connected to a power energy storage system (12); and the power energy storage system (12) is connected to one of a DC / AC inverter (14) and a DC / DC inverter (16).

2. A new type of container terminal RTG safety protection device according to claim 1, characterized in that: The RTG master control PLC module (7) controls the working conditions of the rectifier boost module (6), the high-power inverter (4), the first DC / AC inverter (8), the second DC / AC inverter (10), the braking unit (13) and the power energy storage system (12).

3. A new type of container terminal RTG safety protection device according to claim 1, characterized in that: The high-power frequency converter (4) is connected to a lifting motor (5), the first DC / AC frequency converter (8) is connected to a trolley motor (9), and the second DC / AC frequency converter (10) is connected to a trolley motor (11).

4. A new type of container terminal RTG safety protection device according to claim 1, characterized in that: There are two structures. In the first structure, the DC / AC inverter (14) is directly connected to the power consumption site (15).

5. A new type of container terminal RTG safety protection device according to claim 1, characterized in that: In the second structure, the DC / AC inverter (14) is converted into a DC / DC frequency converter (16), the DC / DC frequency converter (16) is connected to the DC bus (1), and the DC / DC frequency converter (16) is controlled by the RTG master control PLC module (7).

6. A new type of RTG safety protection device for container terminals according to claim 1, characterized in that: The output end of the diesel generator (3) is connected to the auxiliary power supply system (2) and the input end of the rectifier-boost module (6), the output end of the rectifier-boost module (6) is connected to the input end of the DC bus (1), and the DC bus (1) is bidirectionally connected to the high-power inverter (4), the first DC / AC inverter (8), and the second DC / AC inverter (10).

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