Lifting equipment energy recovery system based on high-power battery

Abstract

The utility model discloses a lifting equipment energy recovery system based on a high-power battery, which relates to the technical field of lifting equipment energy conservation and comprises a first bidirectional DC-DC conversion module, a second bidirectional DC-DC conversion module, a second bidirectional DC-DC conversion module, a third bidirectional DC-DC conversion module, a fourth bidirectional DC-DC conversion module, a fourth bidirectional DC-DC conversion module and a fourth bidirectional DC-DC conversion module, the power supply voltage of a lifting frequency converter of the first lifting equipment is adjusted; the second bidirectional DC-DC conversion module is used for monitoring the voltage of a direct-current bus on the second lifting equipment lifting frequency converter and monitoring the power supply voltage of the second lifting equipment lifting frequency converter; and the low-voltage direct-current busbar is used for connecting the first bidirectional DC-DC conversion module and the second bidirectional DC-DC conversion module and transmitting electric energy. The device can prevent the overhigh voltage from damaging the lifting frequency converter and the lifting motor of the lifting equipment, so as to protect the safe operation of the equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of energy saving of lifting equipment, and provides a lifting equipment energy recovery system based on a high-power battery. Background Art

[0002] In special equipment such as lifts and elevators, when they are descending with heavy loads, ascending with light loads, or braking, the motor will be in a power generation state, resulting in reverse power supply. During the operation of the lifting equipment, especially during descent or braking, the lifting motor is usually in a power generation state. However, traditional lifting equipment systems often do not have an effective energy recovery mechanism, resulting in this part of energy being wasted, which not only increases energy consumption but also reduces the energy utilization efficiency of the system.

[0003] When lifting equipment is being lifted or lowered, the voltage of the inverter DC bus may fluctuate. If the voltage is too high or too low, it may damage the equipment or even cause a safety accident. Existing lifting equipment systems usually lack an effective voltage stabilization mechanism and cannot guarantee the stable operation of the system.

[0004] In scenarios where multiple lifting equipment are shared, there is often a lack of effective coordination mechanisms for energy management and utilization among the equipment. The energy generated by one device cannot be effectively utilized by other devices, resulting in low overall energy utilization efficiency. Utility Model Content

[0005] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the utility model is to provide a lifting equipment energy recovery system based on a high-power battery to prevent excessive voltage from causing damage to the lifting inverter and lifting motor of the lifting equipment, so as to protect the safe operation of the equipment.

[0006] In order to achieve the above object, the utility model provides the following technical solutions, including:

[0007] The first lifting device lifting frequency converter and the second lifting device lifting frequency converter are used to supply power to the lifting motor of the lifting device;

[0008] A first bidirectional DC-DC conversion module: used to monitor the voltage of the DC bus on the lifting inverter of the first lifting device and adjust the power supply voltage of the lifting inverter of the first lifting device;

[0009] A second bidirectional DC-DC conversion module: used to monitor the voltage of the DC bus on the lifting inverter of the second lifting device, and adjust the power supply voltage of the lifting inverter of the second lifting device according to a preset control process;

[0010] Low-voltage DC busbar: used to connect the first bidirectional DC-DC conversion module and the second bidirectional DC-DC conversion module and perform power transmission;

[0011] A high-power battery pack: used to store the electric energy converted by the first bidirectional DC-DC conversion module and the second bidirectional DC-DC conversion module;

[0012] Control monitoring unit: used to monitor the power generation state of the lifting motor of the lifting equipment and send a control signal to the first bidirectional DC-DC conversion module and the second bidirectional DC-DC conversion module to supplement and release the electric energy in the high-power battery pack to the DC bus of the first lifting inverter of the lifting equipment and the DC bus of the second lifting inverter of the lifting equipment, so as to provide electric energy for the lifting motor of the lifting equipment;

[0013] The first lifting device lifting inverter is connected to the first end of the low-voltage DC busbar through the first bidirectional DC-DC conversion module, the second lifting device lifting inverter is connected to the second end of the low-voltage DC busbar through the second bidirectional DC-DC conversion module, and the third end of the low-voltage DC busbar is connected to the control and monitoring unit through the high-power battery pack.

[0014] Furthermore, it also includes:

[0015] A first high-voltage DC circuit breaker is used to cut off the DC current, and one end of the first high-voltage DC circuit breaker is connected to the lifting inverter of the first lifting equipment;

[0016] The first high-voltage DC fuse: used to fuse and protect the lifting motor of the lifting equipment when the current is greater than the rated value; one end of the first high-voltage DC fuse is connected to the other end of the first high-voltage DC circuit breaker, and the other end of the first high-voltage DC fuse is connected to the high-voltage side of the first bidirectional DC-DC conversion module.

[0017] Furthermore, it also includes:

[0018] A second high-voltage DC circuit breaker is used to cut off the DC current. One end of the second high-voltage DC circuit breaker is connected to the lifting inverter of the second lifting equipment.

[0019] The second high-voltage DC fuse is used to fuse and protect the lifting motor of the lifting equipment when the current is greater than the rated value; one end of the second high-voltage DC fuse is connected to the other end of the second high-voltage DC circuit breaker, and the other end of the second high-voltage DC fuse is connected to the high-voltage side of the second bidirectional DC-DC conversion module.

[0020] Furthermore, it also includes:

[0021] Low-voltage DC circuit breaker: used to cut off DC current; one end of the low-voltage DC circuit breaker is connected to the low-voltage side of the first bidirectional DC-DC conversion module, and the other end of the low-voltage DC circuit breaker is connected to the high-power battery pack.

[0022] Furthermore, it also includes:

[0023] The first braking resistor is used to convert the electric energy of the lifting motor of the lifting device into heat energy; the first braking resistor is connected in parallel with the first lifting inverter of the lifting device and the high-voltage side of the first bidirectional DC-DC conversion module;

[0024] The second braking resistor is used to convert the electric energy of the lifting motor of the lifting equipment into heat energy; the second braking resistor is connected in parallel with the high-voltage side of the second lifting inverter of the lifting equipment and the second bidirectional DC-DC conversion module.

[0025] Furthermore, the control and monitoring unit adopts a BMS system, and the control and monitoring unit is connected to the high-power battery pack to monitor the status indicators of the high-power battery pack.

[0026] Furthermore, the status indicators of the high-power battery pack include voltage, temperature, input current and output current.

[0027] Compared with the prior art, the beneficial effects of the utility model are:

[0028] The utility model improves the safety of the operation of the lifting motor of the lifting equipment through a high-power battery lifting equipment energy recovery system. When the lifting motor of the lifting equipment is working in the power generation state and the DC bus voltage of the inverter is higher than the set threshold, power is returned to the DC bus of the inverter, and the control monitoring unit sends a control signal to the first bidirectional DC-DC conversion module according to the monitored power generation state, so that the first bidirectional DC-DC conversion module converts the electric energy absorbed from the DC bus of the lifting inverter of the lifting equipment to charge the high-power battery pack. When it is monitored that the DC bus voltage of the lifting inverter of the second lifting equipment is lower than the set threshold, the second bidirectional DC-DC conversion module starts to discharge, and power is supplied from the high-power battery pack to the DC bus of the lifting inverter of the second lifting equipment to maintain voltage stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A structural block diagram of a lifting equipment energy recovery system based on a high-power battery provided in an embodiment of the utility model;

[0030] Figure 2 A schematic diagram of the structure of a lifting equipment energy recovery system based on a high-power battery provided in an embodiment of the utility model;

[0031] In the figure:

[0032] 1-first lifting device lifting inverter, 2-first high-voltage DC circuit breaker, 3-first high-voltage DC fuse, 4-first bidirectional DC-DC conversion module, 5-low-voltage DC busbar, 6-low-voltage DC circuit breaker, 7-high-power battery pack, 8-control and monitoring unit, 9-second lifting device lifting inverter, 10-second high-voltage DC circuit breaker, 11-second high-voltage DC fuse, 12-second bidirectional DC-DC conversion module, R-brake resistor. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. 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.

[0034] See also Figure 1 , this embodiment provides a lifting equipment energy recovery system based on a high-power battery, comprising:

[0035] The first lifting device lifting frequency converter 1 and the second lifting device lifting frequency converter 9 are used to supply power to the lifting motor of the lifting device;

[0036] The first bidirectional DC-DC conversion module 4 is used to monitor the voltage of the DC bus on the first lifting device lifting inverter 1 and adjust the power supply voltage of the first lifting device lifting inverter 1 according to a preset control process;

[0037] The second bidirectional DC-DC conversion module 12 is used to monitor the voltage of the DC bus on the lifting inverter 9 of the second lifting device, and adjust the power supply voltage of the lifting inverter 9 of the second lifting device according to a preset control process;

[0038] Low voltage DC busbar 5: used to connect the first bidirectional DC-DC conversion module 4 and the second bidirectional DC-DC conversion module 12, and perform power transmission;

[0039] High-power battery pack 7: used to store the electric energy converted by the first bidirectional DC-DC conversion module 4 and the second bidirectional DC-DC conversion module 12;

[0040] Control monitoring unit 8: used to monitor the power generation state of the lifting motor of the lifting equipment and send a control signal to the first bidirectional DC-DC conversion module 4 and the second bidirectional DC-DC conversion module 12 to supplement and release the electric energy in the high-power battery pack to the DC bus of the first lifting inverter 1 and the second lifting inverter 9 of the lifting equipment, so as to provide electric energy for the lifting motor of the lifting equipment;

[0041] The lifting inverter 1 of the first lifting equipment is connected to the first end of the low-voltage DC bus 5 through the first bidirectional DC-DC conversion module 4, the lifting inverter 9 of the second lifting equipment is connected to the second end of the low-voltage DC bus 5 through the second bidirectional DC-DC conversion module 12, and the third end of the low-voltage DC bus 5 is connected to the control and monitoring unit 8 through the high-power battery pack 7.

[0042] Specifically, when more than two bidirectional DC-DC conversion modules are connected, and the DC bus voltage of the lifting motor inverter of one lifting device is higher than the threshold, and the DC bus voltage of the lifting motor inverter of another lifting device is lower than the threshold, the bidirectional DC-DC conversion module higher than the threshold can directly supply power to the other bidirectional DC-DC conversion module lower than the threshold through the low-voltage DC bus connected to the other bidirectional DC-DC conversion module lower than the threshold, and then supply power to the inverter DC bus lower than the threshold through the bidirectional DC-DC conversion module. The low-voltage DC bus 5 is used to connect multiple bidirectional DC-DC conversion modules; one end of the low-voltage DC bus 5 is connected to multiple bidirectional DC-DC conversion modules, and the other end of the low-voltage DC bus 5 is connected to a high-power battery pack 7.

[0043] Specifically, the low-voltage DC busbar 5 is divided into two busbars with positive and negative poles. One end of the positive pole of the low-voltage DC busbar is connected to the positive pole of multiple bidirectional DC-DC conversion modules, and the other end is connected to the positive terminal of the low-voltage DC circuit breaker 6. One end of the negative pole of the low-voltage DC busbar is connected to the negative pole of multiple bidirectional DC-DC conversion modules, and the other end is connected to the negative terminal of the low-voltage DC circuit breaker 6. The function of the low-voltage DC busbar is to connect the low-voltage DC side when multiple bidirectional DC-DC conversion modules are connected, and to connect the high-power battery pack 7.

[0044] Among them, the preset control process is:

[0045] When the lifting motor of the lifting equipment is in the power generation state, and the DC bus voltage on the first lifting equipment lifting inverter 1 is greater than the threshold, and the DC bus voltage on the second lifting equipment lifting inverter 9 is lower than the threshold, the first bidirectional DC-DC conversion module 4 converts the electric energy absorbed by the DC bus on the first lifting equipment lifting inverter 1, and transmits it to the second bidirectional DC-DC conversion module 12 through the low-voltage DC bus 5. The second bidirectional DC-DC conversion module 12 releases the electric energy to the DC bus of the second lifting equipment lifting inverter 9 to provide electric energy for the lifting motor of the lifting equipment.

[0046] Specifically, when the lifting motor of the lifting equipment is in a power generation state and the DC bus voltage of the first lifting equipment lifting inverter 1 is greater than the threshold, the first bidirectional DC-DC conversion module 4 converts the electric energy absorbed by the DC bus of the first lifting equipment lifting inverter 1 to charge the high-power battery pack 7; when the DC bus voltage of the first lifting equipment lifting inverter 1 is lower than the threshold, the first bidirectional DC-DC conversion module 4 releases the electric energy in the high-power battery pack 7 to the DC bus of the first lifting equipment lifting inverter 1 to provide electric energy for the lifting motor of the lifting equipment.

[0047] Specifically, when the lifting equipment is working, when the first bidirectional DC-DC conversion module 4 detects that the DC bus voltage of the lifting inverter 1 of the first lifting equipment rises to higher than the set threshold, and receives the lifting motor descending signal sent by the control monitoring unit 8, the first bidirectional DC-DC module 4 converts the electric energy absorbed on the DC bus of the lifting inverter 1 of the first lifting equipment to charge the high-power battery pack 7, and the first DC bus of the lifting inverter 1 of the lifting equipment absorbs the electric energy returned when the lifting motor of the lifting equipment moves downward. Conversely, when it is detected that the DC bus voltage of the lifting inverter 1 of the first lifting equipment is lower than the set threshold, the first bidirectional DC-DC conversion module 4 releases the electric energy in the high-power battery pack 7 to the DC bus of the lifting inverter 1 of the lifting equipment, that is, supplies power from the high-power battery pack 7 to the DC bus of the lifting inverter 1 of the first lifting equipment, maintains voltage stability, and promotes efficient operation of the equipment.

[0048] When the first bidirectional DC-DC conversion module 4 converts the electric energy absorbed by the DC bus of the first lifting equipment lifting inverter 1, and transmits it to the second bidirectional DC-DC conversion module 12 through the low-voltage DC bus 5, and the second bidirectional DC-DC conversion module 12 releases the electric energy to the DC bus of the second lifting equipment lifting inverter 9, the control monitoring unit 8 detects the state of the lifting motor of the lifting equipment and controls the second bidirectional DC-DC conversion module 12 to supplement and release the electric energy in the high-power battery pack 7 to the DC bus of the first lifting inverter 1, so as to provide electric energy for the lifting motor of the lifting equipment.

[0049] Specifically, when the lifting motor of the lifting equipment is in a power generation state and the DC bus voltage of the second lifting equipment lifting inverter 9 is greater than the threshold, the second bidirectional DC-DC conversion module 12 converts the electric energy absorbed by the DC bus of the second lifting equipment lifting inverter 9 to charge the high-power battery pack 7; when the DC bus voltage of the second lifting equipment lifting inverter 9 is lower than the threshold, the second bidirectional DC-DC conversion module 12 releases the electric energy in the high-power battery pack 7 to the DC bus of the second lifting equipment lifting inverter 9 to provide electric energy for the lifting motor of the lifting equipment.

[0050] Specifically, when the lifting equipment is working, when the second bidirectional DC-DC module 12 detects that the DC bus voltage of the lifting inverter 9 of the lifting equipment rises to a value higher than the set threshold, and receives the lifting motor descending signal sent by the control monitoring unit 8, the second bidirectional DC-DC module 12 converts the electric energy absorbed on the DC bus of the lifting inverter 9 of the second lifting equipment to charge the high-power battery pack 7, and absorbs the electric energy returned from the DC bus of the lifting inverter 9 of the second lifting equipment when the lifting motor of the lifting equipment descends. Conversely, when it is detected that the DC bus voltage of the lifting inverter 9 of the second lifting equipment is lower than the set threshold, the second bidirectional DC-DC module 12 releases the electric energy in the high-power battery pack 7 to the DC bus of the lifting inverter 9 of the second lifting equipment, that is, supplies power from the high-power battery pack 7 to the DC bus of the lifting inverter 9 of the second lifting equipment, thereby maintaining voltage stability and promoting efficient operation of the equipment.

[0051] When the lifting motor of the lifting equipment is in the power generation state or is lower than the threshold value, and the DC bus voltage of the first lifting equipment lifting inverter 1 is greater than the threshold value, the first bidirectional DC-DC conversion module 4 converts the electric energy absorbed on the DC bus of the first lifting equipment lifting inverter 1, and transmits it to the second bidirectional DC-DC conversion module 12, and the electric energy is released to the DC bus of the second lifting equipment lifting inverter 9 through the second bidirectional DC-DC conversion module 12, so as to provide electric energy for the lifting motor of the lifting equipment;

[0052] When the DC bus voltage of the second lifting device lifting inverter 9 is lower than the threshold, the second bidirectional DC-DC conversion module 12 releases the electric energy in the high-power battery pack 7 to the DC bus of the second lifting device lifting inverter 9 to provide electric energy for the lifting motor of the lifting device.

[0053] Specifically, when the lifting motor of the lifting equipment is in a power generation state or is lower than a threshold value, and the DC bus voltage of the first lifting equipment lifting inverter 1 is greater than the threshold value, and the DC bus voltage of the second lifting equipment lifting inverter 9 is lower than the threshold value, the first bidirectional DC-DC conversion module 4 converts the electric energy absorbed on the DC bus of the first lifting equipment lifting inverter 1, and transmits it to the second bidirectional DC-DC conversion module 12 through the low-voltage DC bus 5. The electric energy is released to the DC bus of the second lifting equipment lifting inverter 9 through the second bidirectional DC-DC conversion module 12 to provide electric energy for the lifting motor of the lifting equipment; when The first bidirectional DC-DC conversion module 4 converts the electric energy absorbed on the DC bus of the first lifting equipment lifting inverter 1, and transmits it to the second bidirectional DC-DC conversion module 12 through the low-voltage DC bus 5. When the second bidirectional DC-DC conversion module 12 releases the electric energy to the DC bus of the second lifting equipment lifting inverter 9, the control monitoring unit 8 detects the state of the lifting motor of the lifting equipment and controls the second bidirectional DC-DC conversion module 12 to supplement and release the electric energy in the high-power battery pack 7 to the DC bus of the second lifting inverter 9 to provide electric energy for the lifting motor of the lifting equipment.

[0054] See also Figure 2 , which also includes:

[0055] The first high-voltage DC circuit breaker 2 is used to cut off the DC current. One end of the first high-voltage DC circuit breaker 2 is connected to the lifting inverter 1 of the first lifting equipment;

[0056] The first high-voltage DC fuse 3 is used to fuse and protect the lifting motor of the lifting equipment when the current is greater than the rated value; one end of the first high-voltage DC fuse 3 is connected to the other end of the first high-voltage DC circuit breaker 2, and the other end of the first high-voltage DC fuse 3 is connected to the high-voltage side of the first bidirectional DC-DC conversion module 4.

[0057] Specifically, the first high-voltage DC circuit breaker 2 is a DC switch device, with four fixing screws on the upper and lower parts, respectively, for fixing the positive terminal and the negative terminal. One end of the first high-voltage DC circuit breaker 2 is connected to the first lifting device lifting inverter 1, and the other end of the first high-voltage DC circuit breaker 2 is connected to the first high-voltage DC fuse 3. The function of the first high-voltage DC circuit breaker 2 is to control the magnitude and direction of the current in the DC system. When a fault occurs in the system or maintenance is required, the circuit can be quickly disconnected to protect the safety of power grid equipment and personnel.

[0058] Specifically, the first high-voltage DC fuse 3 is a DC protection device, which automatically blows when the current in the system is greater than the resistance rating of the high-voltage DC fuse to protect the safety of the equipment. One end of the first high-voltage DC fuse 3 is connected to the first high-voltage DC circuit breaker 2, and the other end of the first high-voltage DC fuse 3 is connected to the high-voltage side of the bidirectional DC-DC conversion module 4.

[0059] Among them, it also includes:

[0060] A second high-voltage DC circuit breaker 10 is used to cut off the DC current. One end of the second high-voltage DC circuit breaker 10 is connected to the lifting inverter 9 of the second lifting equipment.

[0061] The second high-voltage DC fuse 11 is used to fuse and protect the lifting motor of the lifting equipment when the current is greater than the rated value; one end of the second high-voltage DC fuse 11 is connected to the other end of the second high-voltage DC circuit breaker 10, and the other end of the second high-voltage DC fuse 11 is connected to the high-voltage side of the second bidirectional DC-DC conversion module 12.

[0062] Specifically, the high-voltage DC circuit breaker 10 is a DC switch device, with four fixing screws on the upper and lower parts, respectively, for fixing the positive terminal and the negative terminal. One end of the high-voltage DC circuit breaker 10 is connected to the lifting inverter 9 of the lifting equipment, and the other end of the high-voltage DC circuit breaker 10 is connected to the high-voltage DC fuse 11. The function of the high-voltage DC circuit breaker 10 is to control the magnitude and direction of the current in the DC system. When a fault occurs in the system or maintenance is required, the circuit can be quickly disconnected to protect the safety of the power grid equipment and personnel.

[0063] Specifically, the high-voltage DC fuse 11 is a DC protection device, which automatically blows when the current in the system is greater than the resistance rating of the high-voltage DC fuse to protect the safety of the equipment. One end of the high-voltage DC fuse 11 is connected to the high-voltage DC circuit breaker 10, and the other end of the high-voltage DC fuse 11 is connected to the high-voltage side of the bidirectional DC-DC conversion module 12.

[0064] Among them, it also includes:

[0065] Low-voltage DC circuit breaker 6 : used to cut off DC current; one end of the low-voltage DC circuit breaker 6 is connected to the low-voltage side of the first bidirectional DC-DC conversion module 4 , and the other end of the low-voltage DC circuit breaker 6 is connected to the high-power battery pack 7 .

[0066] Specifically, the low-voltage DC circuit breaker 6 is a DC switch device, with four fixing screws on the upper and lower parts, respectively, for fixing the positive terminal and the negative terminal. One end of the low-voltage DC circuit breaker 6 is connected to the low-voltage DC busbar, and the other end of the low-voltage DC circuit breaker 6 is connected to the high-power battery pack 7. The function of the low-voltage DC circuit breaker 6 is to control the magnitude and direction of the current in the DC system. When a fault occurs in the system or maintenance is required, the circuit can be quickly disconnected to protect the safety of the grid equipment and personnel.

[0067] Among them, it also includes:

[0068] The first braking resistor: used to convert the electric energy of the lifting motor of the lifting equipment into heat energy; the first braking resistor is connected in parallel with the high-voltage side of the first lifting equipment lifting inverter 1 and the first bidirectional DC-DC conversion module 4; DC voltage detection is performed between the first lifting equipment lifting inverter 1 and the first bidirectional DC-DC conversion module 4.

[0069] The second braking resistor is used to convert the electric energy of the lifting motor of the lifting device into heat energy; the second braking resistor is connected in parallel with the high-voltage side of the second lifting inverter 9 and the second bidirectional DC-DC conversion module 12 .

[0070] Specifically, during normal operation, the energy returned by the lifting equipment is first stored by the high-power battery pack 7, and the battery pack 7 is used for battery management. If the high-power battery pack 7 fails, the braking resistor R can continue to ensure the normal operation of the lifting equipment. The system directly recovers the energy originally consumed by the braking resistor R during the operation of the lifting equipment to achieve energy recycling. Using the high-power battery pack 7 as an energy storage unit can effectively solve the disadvantages of low power quality of the feeder technology and improve the power quality of the power grid.

[0071] The control and monitoring unit 8 adopts a BMS system, and the control and monitoring unit 8 is connected to the high-power battery pack 7 to monitor the status indicators of the high-power battery pack.

[0072] Specifically, the control monitoring unit 8 has a protective function of linking the operation state of the lifting motor with the charging and discharging of the DC-DC conversion module 4 and the DC-DC conversion module 12. The control monitoring unit 8 sends a control signal to the DC-DC conversion module 4 and the DC-DC conversion module 12 through CAN communication. The control monitoring unit 8 tracks the operation state of the lifting motor of the lifting equipment in real time. When the lifting motor of the lifting equipment is working in the power generation state and returns power to the DC bus of the inverter, and the DC-DC conversion module 4 and the DC-DC conversion module 12 detect that the DC bus voltage of the lifting inverter 1 and the lifting inverter 9 of the lifting equipment increases, the charging process is executed to prevent charging when the lifting motor is running in the lifting state, thereby further improving the safety of the equipment operation.

[0073] The status indicators of the high-power battery pack 7 include voltage, temperature, input current and output current.

[0074] Specifically, the control center based on the BMS system is responsible for monitoring the operating status of the batteries in the high-power battery pack 7, ensuring the safe and reliable operation of the high-power battery pack 7, and controlling the monitoring unit 8 to manage the batteries of the high-power battery pack 7. The BMS system, i.e., the control monitoring unit 8, can monitor and collect the status parameters of the energy storage battery in real time, including but not limited to the single cell voltage, battery pole temperature, battery loop current, battery pack terminal voltage, battery system insulation resistance, etc., to ensure the safe and reliable operation of the high-power battery pack 7.

[0075] Specifically, the BMS system can monitor various status indicators of the high-power battery pack 7, including voltage, temperature, input / output current, health status of a single battery cell, and balance status of the battery cell. The BMS system can calculate the values ​​of many indicators, including voltage, state of charge indicating the level of charging, health status of the battery capacity, safety status, maximum charging current, i.e., upper limit of charging current, maximum discharge current, i.e., upper limit of discharge current, internal resistance of the battery cell that determines the open circuit voltage, total power provided, total working time, temperature monitoring, etc. The central controller inside the BMS system can establish communication with other modules.

[0076] The utility model improves the safety of the operation of the lifting motor of the lifting equipment through a high-power battery lifting equipment energy recovery system. When the lifting motor of the lifting equipment is working in the power generation state and the DC bus voltage of the inverter is higher than the set threshold, power is returned to the DC bus of the inverter, and the control monitoring unit sends a control signal to the first bidirectional DC-DC conversion module according to the monitored power generation state, so that the first bidirectional DC-DC conversion module converts the electric energy absorbed from the DC bus of the lifting inverter of the lifting equipment to charge the high-power battery pack. When it is monitored that the DC bus voltage of the lifting inverter of the second lifting equipment is lower than the set threshold, the second bidirectional DC-DC conversion module starts to discharge, and power is supplied from the high-power battery pack to the DC bus of the lifting inverter of the second lifting equipment to maintain voltage stability.

[0077] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A lifting equipment energy recovery system based on a high-power battery, characterized in that: include: The first lifting device lifting frequency converter and the second lifting device lifting frequency converter are used to supply power to the lifting motor of the lifting device; A first bidirectional DC-DC conversion module: used to monitor the voltage of the DC bus on the lifting inverter of the first lifting device and adjust the power supply voltage of the lifting inverter of the first lifting device; A second bidirectional DC-DC conversion module: used to monitor the voltage of the DC bus on the lifting inverter of the second lifting device and adjust the power supply voltage of the lifting inverter of the second lifting device; Low-voltage DC busbar: used to connect the first bidirectional DC-DC conversion module and the second bidirectional DC-DC conversion module and perform power transmission; A high-power battery pack: used to store the electric energy converted by the first bidirectional DC-DC conversion module and the second bidirectional DC-DC conversion module; Control monitoring unit: used to monitor the power generation state of the lifting motor of the lifting equipment and send a control signal to the first bidirectional DC-DC conversion module and the second bidirectional DC-DC conversion module to supplement and release the electric energy in the high-power battery pack to the DC bus of the first lifting inverter of the lifting equipment and the DC bus of the second lifting inverter of the lifting equipment, so as to provide electric energy for the lifting motor of the lifting equipment; The first lifting device lifting inverter is connected to the first end of the low-voltage DC busbar through the first bidirectional DC-DC conversion module, the second lifting device lifting inverter is connected to the second end of the low-voltage DC busbar through the second bidirectional DC-DC conversion module, and the third end of the low-voltage DC busbar is connected to the control and monitoring unit through the high-power battery pack.

2. The energy recovery system for lifting equipment based on high-power batteries according to claim 1 is characterized in that: Also includes: A first high-voltage DC circuit breaker is used to cut off the DC current. One end of the first high-voltage DC circuit breaker is connected to the lifting inverter of the first lifting device. The first high-voltage DC fuse: used to fuse and protect the lifting motor of the lifting equipment when the current is greater than the rated value; one end of the first high-voltage DC fuse is connected to the other end of the first high-voltage DC circuit breaker, and the other end of the first high-voltage DC fuse is connected to the high-voltage side of the first bidirectional DC-DC conversion module.

3. The energy recovery system for lifting equipment based on high-power batteries according to claim 1 is characterized in that: Also includes: A second high-voltage DC circuit breaker is used to cut off the DC current, and one end of the second high-voltage DC circuit breaker is connected to the lifting inverter of the second lifting equipment; The second high-voltage DC fuse is used to fuse and protect the lifting motor of the lifting equipment when the current is greater than the rated value; one end of the second high-voltage DC fuse is connected to the other end of the second high-voltage DC circuit breaker, and the other end of the second high-voltage DC fuse is connected to the high-voltage side of the second bidirectional DC-DC conversion module.

4. The energy recovery system for lifting equipment based on high-power batteries according to claim 1 is characterized in that: Also includes: Low-voltage DC circuit breaker: used to cut off DC current; one end of the low-voltage DC circuit breaker is connected to the low-voltage side of the first bidirectional DC-DC conversion module, and the other end of the low-voltage DC circuit breaker is connected to the high-power battery pack.

5. The energy recovery system for lifting equipment based on high-power batteries according to claim 1 is characterized in that: Also includes: The first braking resistor: used to convert the electric energy of the lifting motor of the lifting equipment into heat energy; The first brake resistor is connected in parallel with the first lifting device lifting inverter and the high voltage side of the first bidirectional DC-DC conversion module; The second braking resistor is used to convert the electric energy of the lifting motor of the lifting equipment into heat energy; the second braking resistor is connected in parallel with the high-voltage side of the second lifting inverter of the lifting equipment and the second bidirectional DC-DC conversion module.

6. The energy recovery system for lifting equipment based on high-power batteries according to claim 1 is characterized in that: The control and monitoring unit adopts a BMS system, and the control and monitoring unit is connected to the high-power battery pack to monitor the status indicators of the high-power battery pack.

7. The energy recovery system for lifting equipment based on high-power batteries according to claim 6 is characterized in that: The status indicators of the high-power battery pack include voltage, temperature, input current and output current.

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