Power supply control system of quayside container crane and quayside container crane

Abstract

The utility model discloses a quayside container crane power supply control system and a quayside container crane, and relates to the technical field of quayside container cranes. The power supply control system for the quayside container crane comprises a host system, an external high-voltage circuit, a bidirectional converter, an energy storage unit and a power management system. When the host system works, for example, a heavy object is hoisted, the energy storage unit can supply power to the host system through the bidirectional converter, and the external high-voltage circuit can also output electric energy to supply power to the host system. When the host system slows down and brakes, for example, when a heavy object descends, the host system can recover electric energy generated when the motor works in a power generation state, and the power management system can control the bidirectional converter to perform voltage conversion on the electric energy recovered by the host system and then store the converted electric energy to the energy storage unit. Therefore, electric energy generated during deceleration and braking of the host system can be recycled and utilized, and energy conservation and emission reduction are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of shore container cranes, in particular to a shore container crane power supply control system and a shore container crane. Background Art

[0002] The shore container crane can load and unload containers quickly and efficiently, greatly improving the cargo throughput and operating efficiency of the port. When the shore container crane is lifting heavy objects, it needs an external power supply to make the main engine motor of the host system rotate to lift the heavy objects. After the heavy objects are lifted, the external power is converted into the gravitational potential energy of the heavy objects. When the heavy objects descend, that is, when the host system decelerates and brakes, the gravitational potential energy of the heavy objects will be gradually released as the height of the heavy objects decreases.

[0003] However, existing shore container cranes generally use friction plates to gradually consume the potential energy by converting it into friction heat, or use high-power resistors to consume the electrical energy generated by the motor when it is working in a power generation state. Both methods have the problem of energy waste and are not conducive to energy saving. Utility Model Content

[0004] The main purpose of the utility model is to provide a shore container crane power supply control system, aiming to solve the problem of energy waste in the existing shore container crane power supply control system.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes a shore container crane power supply control system, comprising:

[0006] A host system, used to connect to a load, the host system is used to convert electrical energy into kinetic energy to drive the load to work, and is used to recover electrical energy when the host system is decelerated and braked;

[0007] An external high-voltage circuit, wherein the input end of the external high-voltage circuit is connected to an external high-voltage power supply, and the output end of the external high-voltage circuit is connected to the host system; the external high-voltage circuit is used to convert the voltage of the external high-voltage power supply and output it to the host system to power the host system;

[0008] A bidirectional converter, a first end of which is connected to the host system;

[0009] An energy storage unit, the energy storage unit being connected to the second end of the bidirectional converter;

[0010] A power management system, wherein the power management system is respectively connected to the host system, the external high-voltage circuit and the bidirectional converter; the power management system is used to control the operation of the host system; and, when the host system decelerates and brakes, controls the bidirectional converter to convert the electric energy recovered by the host system into voltage and store it in the energy storage unit.

[0011] In one embodiment, the power management system is also used to detect the electric energy output by the external high-voltage circuit and the first end of the bidirectional converter, and control the operation of the bidirectional converter and / or the external high-voltage circuit based on the detected electric energy output by the external high-voltage circuit and the first end of the bidirectional converter.

[0012] In one embodiment, the power management system comprises:

[0013] A control circuit, wherein the control circuit is connected to the host system and the bidirectional converter respectively;

[0014] a first sensor, wherein a first end of the first sensor is connected to an output end of the external high-voltage circuit, a second end of the first sensor is connected to the host system, and a signal end of the first sensor is connected to the control circuit; the first sensor is used to detect the electric energy output by the external high-voltage circuit;

[0015] A second sensor, wherein the first end of the second sensor is connected to the first end of the bidirectional converter, the second end of the second sensor is connected to the host system, and the signal end of the second sensor is connected to the control circuit; the second sensor is used to detect the electric energy output by the bidirectional converter.

[0016] In one embodiment, the host system includes a plurality of variable frequency rotating devices; each of the variable frequency rotating devices includes:

[0017] A main engine motor, which is used to convert electrical energy into kinetic energy to drive a load to work;

[0018] A motor frequency converter, wherein the motor frequency converter is respectively connected to the host motor, the output end of the external high-voltage circuit and the first end of the bidirectional converter; the motor frequency converter is used to convert the input DC power supply into AC power supply, and to recover electric energy when the host system is decelerating and braking.

[0019] In one embodiment, the external high voltage circuit includes:

[0020] A cable drum device, wherein the cable drum device is used to input an external high voltage power supply;

[0021] A main high-voltage transformer, the main high-voltage transformer being connected to the cable reel device;

[0022] A phase sequence conversion switch, wherein the phase sequence conversion switch is connected to the main high-voltage transformer;

[0023] a first central current receiver, wherein the first central current receiver is connected to the phase sequence conversion switch;

[0024] A main circuit breaker connected to the first central current collector;

[0025] A rectifier feedback unit is connected to the main circuit breaker and the host system respectively.

[0026] In one embodiment, the shore container crane power supply control system further includes an emergency power supply circuit, and the emergency power supply circuit is respectively connected to the external high-voltage circuit, the power management system and the host system;

[0027] The emergency power supply circuit is used to supply power to the host system when the electric energy output by the external high-voltage circuit and the bidirectional converter is lower than a preset value;

[0028] The power management system is also used to control the operation of the emergency power supply circuit.

[0029] In one embodiment, the emergency power supply circuit comprises:

[0030] An under-machine emergency auxiliary circuit, the under-machine emergency auxiliary circuit being connected to the external high-voltage circuit;

[0031] An on-board emergency auxiliary circuit, wherein the on-board emergency auxiliary circuit is respectively connected to the off-board emergency auxiliary circuit, the power management system and the bidirectional converter.

[0032] In one embodiment, the off-board emergency auxiliary circuit includes:

[0033] Auxiliary power supply under the machine;

[0034] a second central power receiver, the second central power receiver being connected to the under-machine auxiliary power supply;

[0035] a first auxiliary circuit breaker connected to the central current receiver;

[0036] an auxiliary transformer, the auxiliary transformer being connected to the first auxiliary circuit breaker;

[0037] A second auxiliary circuit breaker, one end of the second auxiliary circuit breaker is connected to the auxiliary transformer, and the other end of the second auxiliary circuit breaker is connected to the external high-voltage circuit.

[0038] In one embodiment, the onboard emergency auxiliary circuit comprises:

[0039] Onboard auxiliary power supply;

[0040] A third auxiliary circuit breaker, the third auxiliary circuit breaker being connected to the onboard auxiliary power supply and the offboard emergency auxiliary circuit respectively;

[0041] An emergency power supply system, wherein the emergency power supply system is connected to the power management system, the third auxiliary circuit breaker and the host system respectively; the emergency power supply system is used to convert the input power supply into an AC power output to provide an emergency auxiliary power supply for the host system.

[0042] The utility model also provides a shore container crane, wherein the shore container crane comprises the shore container crane power supply control system as described above.

[0043] The technical solution of the utility model adopts a shore container crane power supply control system, including a host system, an external high-voltage circuit, a bidirectional converter, an energy storage unit and a power management system. When the host system is working, such as when lifting a heavy object, the energy storage unit can supply power to the host system through the bidirectional converter, and the external high-voltage circuit can also output electrical energy to supply power to the host system. When the host system decelerates and brakes, such as when a heavy object is lowered, the host system can recover the electrical energy generated when the motor is working in a power generation state, and the power management system can control the bidirectional converter to convert the voltage of the electrical energy recovered by the host system and store it in the energy storage unit. In this way, the utility model can recover and utilize the electrical energy generated when the host system is decelerated and braked, which is beneficial to energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0045] Figure 1 A schematic structural diagram of an embodiment of a power supply control system for a shore container crane provided by the utility model;

[0046] Figure 2 An electronic circuit diagram of another embodiment of the shore container crane power supply control system provided by the utility model;

[0047] Figure 3 The electronic circuit diagram of an exemplary shore container crane power supply control system is shown in FIG.

[0048] Description of Figure Numbers:

[0049]

[0050]

[0051] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0053] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0054] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0055] In the prior art, when lifting a heavy object, a shore container crane needs an external power supply to make the main motor of the host system rotate to lift the heavy object. After the heavy object is lifted, the external power is converted into the gravitational potential energy of the heavy object. When the heavy object descends, that is, when the host system decelerates and brakes, the gravitational potential energy of the heavy object will be gradually released as the height of the heavy object decreases. The power supply system of the shore container crane cannot recover this part of energy, resulting in energy waste.

[0056] See also Figure 3 , Figure 3This is an electronic circuit diagram of an exemplary shore container crane power supply control system. As an exemplary comparative document, the shore container crane power supply control system provides electric energy for the shore container crane through an external high-voltage circuit, specifically through the cable drum device J1, the first transformer T1, the phase sequence conversion switch QS3P, the first central receiver CPR1, the first circuit breaker Q1 and the rectifier feedback unit AFE, the electric energy is transmitted to the host system 10. During operation, if the external high-voltage circuit fails or the power is cut off, for safety and not affecting the operation of other equipment, the terminal low-voltage emergency circuit is connected to the external high-voltage circuit, and emergency power is provided through the low-voltage control loop. Specifically, through the second central receiver CPR2, the second circuit breaker Q2, the third circuit breaker Q3, the second transformer T2 and the fourth circuit breaker Q4, the electric energy is transmitted to part of the circuit of the external high-voltage circuit, and then the external high-voltage circuit transmits the electric energy to the host system 10, opens the brake, slowly lowers the container, and then uses external mechanical equipment to push the host to the repair area. In summary, the shore container crane power supply control system adopts external high-voltage circuit and low-voltage emergency circuit of the wharf for power supply. There is a problem that the power supply system of the shore container crane cannot recover the energy of deceleration and braking of the host system, which causes energy waste, is not conducive to energy saving and has high power supply cost. Moreover, there is a problem that the low-voltage emergency circuit of the wharf provides emergency power supply, which leads to long fault handling time, troublesome assistance, high management cost and special attention to safety.

[0057] The utility model provides a power supply control system for a shore container crane.

[0058] See also Figure 1 In one embodiment of the utility model, the shore container crane power supply control system includes:

[0059] The host system 10 is used to connect to the load, and the host system 10 is used to convert electrical energy into kinetic energy to drive the load to work, and is used to recover electrical energy when the host system 10 decelerates and brakes;

[0060] In this embodiment, the host system 10 may include a frequency conversion system and a speed regulating motor. The frequency conversion system may receive the DC power provided by the bidirectional converter 30 and / or the external high-voltage circuit 20, and convert it into an AC power supply with adjustable voltage and frequency, thereby driving the speed regulating motor to rotate. The rotation of the speed regulating motor may drive the connected load (such as a hook) to move, for example, to lift a heavy object. When the heavy object descends, the speed regulating motor decelerates and brakes, and the rotation direction of the speed regulating motor changes from providing motive force to providing resistance. At this time, the speed regulating motor is in a power generation state and can transmit electric energy to the outside. The rectifier feedback circuit of the frequency conversion system may convert the electric energy output by the speed regulating motor into a DC power output, thereby realizing electric energy recovery.

[0061] An external high-voltage circuit 20, the input end of the external high-voltage circuit 20 is connected to an external high-voltage power source, and the output end of the external high-voltage circuit 20 is connected to the host system 10; the external high-voltage circuit 20 is used to convert the voltage of the external high-voltage power source and output it to the host system 10 to power the host system 10;

[0062] In one embodiment, the external high-voltage circuit can input a DC power supply, which can be provided by a generator, and then transformed into an AC power supply of the required voltage level by a transformer, and the AC power supply can be converted into a stable DC power supply to power the host circuit 10 after adjusting the phase sequence and rectifying and stabilizing the voltage. In another embodiment, the external high-voltage circuit can be connected to the power grid, and transformed into an AC power supply of the required voltage level by a transformer, and the AC power supply can be converted into a stable DC power supply to power the host circuit 10 after adjusting the phase sequence and rectifying and stabilizing the voltage. It can be understood that the external high-voltage circuit 20 can include electronic switches and monitoring elements to monitor and control the transmission of power, and can quickly cut off the power supply in emergency situations, such as unsafe situations such as overcurrent or overvoltage.

[0063] A bidirectional converter 30, a first end of the bidirectional converter 30 is connected to the host system 10;

[0064] In this embodiment, the bidirectional converter 30 is a DC-DC voltage converter, which can realize bidirectional DC voltage conversion. When converting the input voltage to the output voltage, it can be filtered through a filter or an input capacitor to remove possible noise and interference, ensure the stability of the input voltage, and then pass through a switching circuit to realize voltage conversion. These switching circuits can be MOSFET, BJT or other types of switching devices. The switching state of the switching device can be controlled by the input signal of the control circuit therein, and the working cycle and frequency of the switching device can be adjusted as needed. By controlling the working state and working cycle of the switching device, the input voltage can be boosted to the output voltage, or it can be bucked to the output voltage. During the voltage conversion process, energy storage and release can be realized by energy storage elements (such as inductors and capacitors). When the output voltage is output, the control circuit can use a feedback control loop to monitor the output voltage, and adjust the working state of the switching device according to the change of the output voltage to achieve the stability and accuracy of the output voltage. It should be noted that the power management system 50 can control the bidirectional DC voltage conversion work by controlling the control circuit of the bidirectional converter 30.

[0065] An energy storage unit 40, the energy storage unit 40 is connected to the second end of the bidirectional converter 30;

[0066] In this embodiment, the energy storage unit 40 can be a renewable energy storage structure, and renewable energy, such as solar energy, wind energy, tidal energy, etc., can be self-circulated inside the energy storage unit 40 to store electrical energy. When the host system 10 is in a power consumption state, the energy storage unit 40 can output electrical energy to power the host system 10, and when the host system 10 is in a power generation state, the energy storage unit 40 can store the recovered electrical energy.

[0067] The power management system 50 is connected to the host system 10, the external high-voltage circuit 20 and the bidirectional converter 30 respectively; the power management system 50 is used to control the operation of the host system 10; and, when the host system 10 decelerates and brakes, controls the bidirectional converter 30 to convert the electric energy recovered by the host system 10 into voltage and store it in the energy storage unit 40.

[0068] In this embodiment, the power management system 50 can monitor the operating status of the host system 10 and control its operation as needed, including starting, stopping, and adjusting the output power of the host system. The power management system 50 can also monitor the output power of the external high-voltage circuit and control the voltage conversion work of the bidirectional converter 30 to ensure that when the host circuit 10 is in power-using state, the power output by the energy storage unit 40 can be converted into the power required by the host circuit 10. When the host system 10 decelerates and brakes, the generated electric energy is converted into a suitable voltage by the bidirectional converter 30 and stored in the energy storage unit 40. The power management system 50 needs to monitor and control this process to ensure the efficiency and stability of power conversion and storage.

[0069] It is understandable that, since shore container cranes usually require a large amount of electrical energy to carry out container loading and unloading operations, this embodiment can effectively manage and optimize the use of electrical energy, thereby reducing energy consumption and lowering the energy cost of the port.

[0070] It should be noted that the bidirectional converter 30 can be connected to the host system 10 via a DC bus.

[0071] In this embodiment, during normal operation, the energy storage unit 40 can supply power to the host system 10 through the bidirectional converter 30, and the external high-voltage circuit 20 can also output electric energy to supply power to the host system 10. When the host system 10 decelerates and brakes, that is, when the heavy object is lowered, the host system 10 can recover the electric energy generated when the motor is working in the power generation state, and the power management system 50 can control the bidirectional converter 30 to convert the electric energy recovered by the host system 10 into voltage and store it in the energy storage unit 40. In this way, this embodiment can recover and utilize the electric energy generated when the host system 10 decelerates and brakes, that is, when the motor is in the power generation state, which is conducive to energy conservation and emission reduction.

[0072] In the present invention, when the host system 10 is working, such as when lifting a heavy object, the energy storage unit 40 can supply power to the host system 10 through the bidirectional converter 30, and the external high-voltage circuit 20 can also output electric energy to supply power to the host system 10. When the host system 10 is decelerating and braking, such as when a heavy object is lowered, the host system 10 can recover the electric energy generated when the motor is working in the power generation state, and the power management system 50 can control the bidirectional converter 30 to convert the electric energy recovered by the host system 10 into voltage and store it in the energy storage unit 40. In this way, the present invention can recover and utilize the electric energy generated when the host system 10 is decelerating and braking, that is, when the motor is in the power generation state, which is conducive to energy conservation and emission reduction.

[0073] In one embodiment of the utility model, the power management system 50 is also used to detect the electric energy output by the external high-voltage circuit 20 and the first end of the bidirectional converter 30, and control the operation of the bidirectional converter 30 and the external high-voltage circuit 20 based on the detected electric energy output by the external high-voltage circuit 20 and the first end of the bidirectional converter 30.

[0074] It should be noted that the bidirectional converter 30 can also convert the electric energy output by the energy storage unit 40 into a voltage and output it to the host system 10 to supply power to the host system 10;

[0075] In this embodiment, the power management system 50 can control the working power of the host system 10, and the required electric energy can be calculated according to the working power of the host system 10. The power management system 50 can also detect the electric energy output by the external high-voltage circuit 20 and the first end of the bidirectional converter 30 to ensure that the electric energy output of the external high-voltage circuit 20 and the electric energy output of the bidirectional converter 30 can be slightly greater than the electric energy required by the host system 10, so as to provide the electric energy for the normal operation of the host system 10. The distribution of the two parts of electric energy can be determined according to the equipment working conditions and specific technical parameters.

[0076] In one embodiment, the external high-voltage circuit 20 can be used as a large-capacity power configuration, and the energy storage unit 40 can be used as a small-capacity power configuration, that is, the external high-voltage circuit 20 can be used as the main power source, and the energy storage unit 40 can be used as the secondary power source. The lack of electric energy can be calculated based on the output electric energy of the external high-voltage circuit 20, and the bidirectional converter 30 can be controlled to convert and output the electric energy of the energy storage unit 40 to compensate for the lack of electric energy provided by the external high-voltage circuit 20. In this way, this embodiment can ensure the normal operation of the host system 10.

[0077] In another embodiment, the energy storage unit 40 can be a renewable energy storage structure, and renewable energy, such as solar energy, wind energy, tidal energy, etc., can be self-circulated inside the energy storage unit 40 to store electric energy, which is clean for the environment and less polluting, and the energy storage unit 40 can provide sufficient electric energy. It should be noted that since the loads driven by the host system 10 are diverse, the demand for electricity driven by the host system 10 varies greatly. In this embodiment, the energy storage unit 40 can be used as the main source of electric energy, and the external high-voltage circuit 20 can be used as the secondary source of electric energy. When the energy storage unit 40 is sufficient to provide electric energy, the bidirectional converter 30 can be controlled to output electric energy of corresponding power according to the change of the power demand of the host system 10, which is conducive to saving energy. When the energy storage unit 40 is insufficient to provide electric energy for the normal operation of the host system 10, the external high-voltage circuit 20 is connected to supplement the electric energy output to ensure the normal operation of the host system 10.

[0078] See also Figure 2 In one embodiment of the present invention, the power management system 50 includes:

[0079] A control circuit 51, the control circuit 51 is connected to the host system 10 and the bidirectional converter 30 respectively;

[0080] A first sensor 52, wherein a first end of the first sensor 52 is connected to an output end of the external high-voltage circuit 20, a second end of the first sensor 52 is connected to the host system 10, and a signal end of the first sensor 52 is connected to the control circuit 51; the first sensor 52 is used to detect the electric energy output by the external high-voltage circuit 20;

[0081] The second sensor 53, the first end of the second sensor 53 is connected to the first end of the bidirectional converter 30, the second end of the second sensor 53 is connected to the host system 10, and the signal end of the second sensor 52 is connected to the control circuit; the second sensor 53 is used to detect the electric energy output by the bidirectional converter 30.

[0082] In this embodiment, the first sensor 52 and the second sensor 53 may be power sensors for measuring the power output by the external high-voltage circuit 20 and the bidirectional converter 30, and the control circuit 51 may adjust the output of the bidirectional converter 30 and / or the output of the external high-voltage circuit 20 according to the power output by the external high-voltage circuit 20 and the bidirectional converter 30, so as to ensure that the power output of the external high-voltage circuit 20 and the power output of the bidirectional converter 30 are slightly greater than the power required by the host system 10, thereby ensuring the normal operation of the host system 10. The first sensor and / or the second sensor may include a Rogowski coil, and the current value of the sampled AC current may be measured according to the Rogowski coil.

[0083] See also Figure 2In one embodiment of the present utility model, the host system 10 includes a plurality of variable frequency rotating devices; each variable frequency rotating device includes:

[0084] The main engine motor 11 is used to convert electrical energy into kinetic energy to drive the load to work;

[0085] The motor inverter 12 is connected to the host motor 11, the output end of the external high-voltage circuit 20 and the first end of the bidirectional converter 30 respectively; the motor inverter 12 is used to convert the input DC power supply into AC power supply, and to recover electric energy when the host system 10 decelerates and brakes.

[0086] In this embodiment, the host motor 11 can be a speed-adjustable motor, and the motor inverter 12 can include a frequency conversion circuit to convert the input DC power supply into an AC power supply with adjustable voltage and frequency to meet the requirements of smooth speed regulation of the speed-adjustable motor. The motor inverter 12 can also include a rectifier feedback circuit to recover the electric energy generated by the host motor 11 in the power generation state and convert it into stable DC power output to the bidirectional converter 30 for storage in the energy storage unit 40.

[0087] In this embodiment, the host system 10 includes a plurality of variable frequency rotating devices, and this embodiment can achieve the effect that a plurality of host motors 11 drive a plurality of loads to work simultaneously.

[0088] See also Figure 2 In one embodiment of the present utility model, the external high voltage circuit 20 includes:

[0089] A cable drum device 21, the cable drum device 21 is used to input an external high voltage power supply;

[0090] A main high-voltage transformer 22, the main high-voltage transformer 22 is connected to the cable reel device 21;

[0091] A phase sequence conversion switch 23, the phase sequence conversion switch 23 is connected to the main high-voltage transformer 22;

[0092] A first central power receiver 24, the first central power receiver 24 is connected to the phase sequence conversion switch 23;

[0093] A main circuit breaker 25, the main circuit breaker 25 is connected to the first central power receiver 24;

[0094] The rectifier feedback unit 26 is connected to the main circuit breaker 25 and the host system 10 respectively.

[0095] In this embodiment, the cable reel device 21 includes an input end circuit of an external high-voltage power supply, and also includes equipment for storing and managing the input end circuit. The main high-voltage transformer 22 can transform the external high-voltage power supply and output it. Among them, the main high-voltage transformer 22 can convert the external high-voltage power supply into an AC power supply of the required voltage level. The phase sequence conversion switch 23 can adjust the input power phase sequence, the first central power receiver 24 can monitor and manage the input power, the main circuit breaker 25 can connect / cut off the input of the power supply to play a protective role, and the rectifier feedback unit 26 can rectify the input AC power supply and output DC power supply. In this way, this embodiment can provide a stable DC power supply to power the host system 10.

[0096] See also Figure 2 In one embodiment of the utility model, the shore container crane power supply control system further includes an emergency power supply circuit 60, and the emergency power supply circuit 60 is respectively connected to the external high-voltage circuit 20, the power management system 50 and the host system 10;

[0097] The emergency power supply circuit 60 is used to supply power to the host system 10 when the power output by the external high-voltage circuit 20 and the bidirectional converter 30 is lower than a preset value;

[0098] The power management system 50 is also used to control the operation of the emergency power circuit 60 .

[0099] It should be noted that in the prior art, when a high-voltage power supply fails, the brakes can generally be opened by a low-voltage emergency power supply, and then the shore container crane can be moved to a position that does not affect the operation of other spare equipment with the help of external equipment and tools for repair. This emergency handling method is inefficient.

[0100] In this embodiment, when the electric energy output by the external high-voltage circuit 20 and the bidirectional converter 30 is insufficient for the host system 10 to work, that is, when the power management system 50 detects that the electric energy output by the external high-voltage circuit 20 and the bidirectional converter 30 is lower than the preset power value, the emergency power supply circuit 60 is controlled to work and emergency power is supplied to the host system 10. When the power management system 50 detects that the electric energy output by the external high-voltage circuit 20 and the bidirectional converter 30 is greater than or equal to the preset value, it is considered that there is enough electric energy for the host system 10 to work normally, and the emergency power supply circuit 60 is controlled to stop supplying power to the host system 10. In this way, when the high-voltage power supply and the energy storage unit 40 fail to supply power, this embodiment can provide power through the emergency power supply circuit 60 to ensure that the host system 10 can work in an emergency state. It can be understood that when the electric energy provided by the emergency power supply circuit 60 does not meet the rated power of the host system 10 to work, the power management circuit 50 can control the host system 10 to reduce the electric energy required for work by reducing the speed and other operations to cope with temporary operations.

[0101] See also Figure 2 In one embodiment of the present utility model, the emergency power circuit 60 includes:

[0102] An under-machine emergency auxiliary circuit, which is connected to an external high-voltage circuit 20;

[0103] The on-board emergency auxiliary circuit is connected to the off-board emergency auxiliary circuit, the power management system 50 and the bidirectional converter 30 respectively.

[0104] In this embodiment, both the off-plane emergency auxiliary circuit and the on-plane emergency auxiliary circuit can provide emergency power to the host system 10. The off-plane emergency auxiliary circuit can process the input power through part of the circuit of the external high-voltage circuit 20 and output it to the host system 10 to provide emergency power. The on-plane auxiliary circuit can directly provide emergency power to the host system 10. Among them, the off-plane emergency auxiliary circuit can include a central power receiver, and the on-plane emergency auxiliary circuit can be connected to the central power receiver of the off-plane emergency auxiliary circuit. The power transmission between the off-plane emergency auxiliary circuit and the on-plane emergency auxiliary circuit can be monitored and distributed by the central power receiver. Among them, the emergency power provided by the off-plane emergency auxiliary circuit or / and the on-plane emergency auxiliary circuit can be specifically controlled according to the emergency situation.

[0105] See also Figure 2 In one embodiment of the utility model, the under-machine emergency auxiliary circuit includes:

[0106] Auxiliary power supply 61 below the machine;

[0107] A second central power receiver 62, the second central power receiver 62 is connected to the auxiliary power supply 61 under the machine;

[0108] A first auxiliary circuit breaker 63, the first auxiliary circuit breaker 63 is connected to the central power receiver;

[0109] An auxiliary transformer 64, the auxiliary transformer 64 is connected to the first auxiliary circuit breaker 63;

[0110] The second auxiliary circuit breaker 65 has one end connected to the auxiliary transformer 64 and the other end connected to the external high-voltage circuit 20 .

[0111] In this embodiment, the second auxiliary circuit breaker 65 is connected to the input end of the first central power receiver 24 of the external high-voltage circuit 20. When the off-board emergency auxiliary circuit is working, the off-board auxiliary power supply 61 provides power input, and the second central power receiver 62 can monitor and manage the output of the power supply. The first auxiliary circuit breaker 63 can turn on / off the input of the power supply to play a protective role, and the auxiliary transformer 64 can transform the input power supply and output it. Among them, the auxiliary transformer 64 can convert the external high-voltage power supply into an AC power supply of the required voltage level. The second auxiliary circuit breaker 65 can turn on / off the input of the power supply to play a protective role. In this way, this embodiment can provide AC power through the off-board emergency auxiliary circuit, and then rectify part of the circuit of the external high-voltage circuit 20, so as to provide a temporary emergency power supply to the host system 10 for temporary operation.

[0112] See also Figure 2 In one embodiment of the utility model, the onboard emergency auxiliary circuit includes:

[0113] Onboard auxiliary power supply 66;

[0114] A third auxiliary circuit breaker 67, the third auxiliary circuit breaker 67 is connected to the onboard auxiliary power supply 66 and the offboard emergency auxiliary circuit respectively;

[0115] The emergency power supply system 68 is connected to the power management system 50, the third auxiliary circuit breaker 67 and the host system 10 respectively; the emergency power supply system 68 is used to convert the input power into AC power output to provide emergency auxiliary power for the host system 10.

[0116] It should be noted that, in an emergency situation, the external high-voltage circuit 20 and the energy storage unit 40 cannot provide enough electric energy, and the motor inverter 12 stops working. At the same time, the onboard emergency auxiliary circuit starts working, and the emergency power supply system 68 can directly provide AC variable frequency power to the host motor 11 of the host system 10 for the host system 10 to work. Among them, the second central power receiver 62 can monitor and manage the output of the power supply. The third auxiliary circuit breaker 67 can turn on / off the input of the power supply to play a protective role. In this way, this embodiment can provide a temporary emergency power supply to the host system 10 for temporary operation. In this embodiment, the power management system 50 can control the operation of the emergency power supply system 68. When the power management system 50 detects that the power output of the external high-voltage circuit 20 and the bidirectional converter 30 is lower than the preset power value, the emergency power supply system 68 can be controlled to convert the input power supply into AC power output to provide emergency auxiliary power supply for the host system 10. In this way, compared with the prior art, this embodiment has higher fault handling efficiency and higher safety.

[0117] In one embodiment, if one of the two emergency auxiliary circuits fails or loses power, the first auxiliary circuit breaker 63, the second auxiliary circuit breaker 65 and the third auxiliary circuit breaker 67 can be quickly turned on / off to control the other circuit to independently and seamlessly and quickly provide power to the host circuit 10, which can play a good emergency role and can be used for temporary emergency operations. Compared with the prior art that can only transmit power to the external high-voltage circuit 20 and then to the host circuit 10 through the low-voltage emergency circuit, the fault handling efficiency is higher and the safety is higher.

[0118] The utility model also proposes a shore container crane, which includes a shore container crane power supply control system. The specific structure of the shore container crane power supply control system refers to the above-mentioned embodiment. Since the shore container crane adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0119] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A power supply control system for a shore container crane. It is characterized in that include: A host system, used to connect to a load, the host system is used to convert electrical energy into kinetic energy to drive the load to work, and is used to recover electrical energy when the host system is decelerated and braked; An external high-voltage circuit, wherein the input end of the external high-voltage circuit is connected to an external high-voltage power supply, and the output end of the external high-voltage circuit is connected to the host system; the external high-voltage circuit is used to convert the voltage of the external high-voltage power supply and output it to the host system to power the host system; A bidirectional converter, a first end of which is connected to the host system; An energy storage unit, the energy storage unit being connected to the second end of the bidirectional converter; A power management system, the power management system is connected to the host system, the external high-voltage circuit and the bidirectional converter respectively; the power management system is used to control the operation of the host system; Furthermore, when the host system is decelerating and braking, the bidirectional converter is controlled to convert the electric energy recovered by the host system into a voltage and then store it in the energy storage unit.

2. The shore container crane power supply control system according to claim 1, It is characterized in that The power management system is also used to detect the electric energy output by the external high-voltage circuit and the first end of the bidirectional converter, and control the operation of the bidirectional converter and / or the external high-voltage circuit based on the detected electric energy output by the external high-voltage circuit and the first end of the bidirectional converter.

3. The shore container crane power supply control system according to claim 2, It is characterized in that The power management system comprises: A control circuit, wherein the control circuit is connected to the host system and the bidirectional converter respectively; a first sensor, wherein a first end of the first sensor is connected to an output end of the external high-voltage circuit, a second end of the first sensor is connected to the host system, and a signal end of the first sensor is connected to the control circuit; the first sensor is used to detect the electric energy output by the external high-voltage circuit; A second sensor, wherein the first end of the second sensor is connected to the first end of the bidirectional converter, the second end of the second sensor is connected to the host system, and the signal end of the second sensor is connected to the control circuit; the second sensor is used to detect the electric energy output by the bidirectional converter.

4. The shore container crane power supply control system according to claim 1, It is characterized in that The host system includes a plurality of variable frequency rotating devices; each of the variable frequency rotating devices includes: A main engine motor, which is used to convert electrical energy into kinetic energy to drive a load to work; A motor frequency converter, wherein the motor frequency converter is respectively connected to the host motor, the output end of the external high-voltage circuit and the first end of the bidirectional converter; the motor frequency converter is used to convert the input DC power supply into AC power supply, and to recover electric energy when the host system is decelerating and braking.

5. The shore container crane power supply control system according to claim 1, It is characterized in that The external high-voltage circuit comprises: A cable drum device, wherein the cable drum device is used to input an external high voltage power supply; A main high-voltage transformer, the main high-voltage transformer being connected to the cable reel device; A phase sequence conversion switch, wherein the phase sequence conversion switch is connected to the main high-voltage transformer; a first central current receiver, wherein the first central current receiver is connected to the phase sequence conversion switch; A main circuit breaker connected to the first central current collector; A rectifier feedback unit is connected to the main circuit breaker and the host system respectively.

6. The shore container crane power supply control system according to claim 1, It is characterized in that The shore container crane power supply control system further includes an emergency power supply circuit, which is connected to the external high-voltage circuit, the power management system and the host system respectively; The emergency power supply circuit is used to supply power to the host system when the electric energy output by the external high-voltage circuit and the bidirectional converter is lower than a preset value; The power management system is also used to control the operation of the emergency power supply circuit.

7. The shore container crane power supply control system according to claim 6, It is characterized in that The emergency power supply circuit comprises: An under-machine emergency auxiliary circuit, the under-machine emergency auxiliary circuit being connected to the external high-voltage circuit; An on-board emergency auxiliary circuit, wherein the on-board emergency auxiliary circuit is respectively connected to the off-board emergency auxiliary circuit, the power management system and the bidirectional converter.

8. The shore container crane power supply control system according to claim 7, It is characterized in that The under-aircraft emergency auxiliary circuit comprises: Auxiliary power supply under the machine; a second central power receiver, the second central power receiver being connected to the under-machine auxiliary power supply; a first auxiliary circuit breaker, the first auxiliary circuit breaker being connected to the second central current receiver; an auxiliary transformer, the auxiliary transformer being connected to the first auxiliary circuit breaker; A second auxiliary circuit breaker, one end of the second auxiliary circuit breaker is connected to the auxiliary transformer, and the other end of the second auxiliary circuit breaker is connected to the external high-voltage circuit.

9. The shore container crane power supply control system according to claim 7, It is characterized in that The onboard emergency auxiliary circuit comprises: Onboard auxiliary power supply; A third auxiliary circuit breaker, the third auxiliary circuit breaker being connected to the onboard auxiliary power supply and the offboard emergency auxiliary circuit respectively; An emergency power supply system, wherein the emergency power supply system is connected to the power management system, the third auxiliary circuit breaker and the host system respectively; the emergency power supply system is used to convert the input power into an AC power output to provide an emergency auxiliary power supply for the host system.

10. A shore container crane, It is characterized in that The shore container crane comprises a shore container crane power supply control system according to any one of claims 1 to 9.

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