Lifting equipment energy recovery emergency power supply system based on high-power battery

Abstract

The utility model discloses a lifting equipment energy recovery emergency power supply system based on a high-power battery, and relates to the technical field of lifting equipment energy conservation. The bidirectional DC-DC conversion module is used for monitoring the voltage of a DC bus on the lifting device lifting frequency converter and adjusting the power supply voltage of the lifting device lifting frequency converter; the high-power battery pack is used for storing the electric energy converted by the bidirectional DC-DC conversion module and supplying power to a lifting frequency converter of the lifting equipment through the bidirectional DC-DC conversion module after the lifting equipment loses power; and the alternating-current and direct-current inverter is used for inverting the electric energy released by the high-power battery pack. According to the utility model, the operation cost of the lifting equipment can be reduced under the condition of having the same function of a standby power supply.

Description

Technical Field

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

[0002] In order to ensure that high-rise and super-high-rise lifting equipment and elevators can operate normally in the event of power outages or other emergencies, it is required to be equipped with a separate power backup power supply that can ensure that the lifting equipment can run to the adjacent floor and open the door, or ensure that the lifting equipment can run to the floor closest to the ground and automatically stop, so the capacity of the backup power supply must be large enough. At the same time, the capacity of the backup power supply also needs to take into account the needs of future elevator upgrades to ensure the safety and stability of the elevator.

[0003] In actual daily use, the actual life of the backup power supply of the lifting equipment is short and is always in a floating charge state. Some backup power supplies no longer have normal functions when they are actually needed, which increases the operating cost of the lifting equipment and causes great waste of materials and electrical energy resources. Utility Model Content

[0004] 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 emergency power supply system based on high-power batteries, which reduces the operating cost of the lifting equipment while having the same function as a backup power supply.

[0005] In order to achieve the above object, the utility model provides the following technical solutions, including:

[0006] Lifting equipment lifting inverter: used to supply power to the lifting motor of the lifting equipment;

[0007] Bidirectional DC-DC conversion module: used to monitor the voltage of the DC bus on the lifting inverter of the lifting equipment and adjust the power supply voltage of the lifting inverter of the lifting equipment;

[0008] High-power battery pack: used to store the electric energy converted by the bidirectional DC-DC conversion module, and to supply power to the lifting inverter of the lifting equipment through the bidirectional DC-DC conversion module after the lifting equipment loses power;

[0009] AC / DC inverter: used to invert the electric energy released by the high-power battery pack;

[0010] Low-voltage DC busbar: used to connect the bidirectional DC-DC conversion module, the high-power battery pack and the AC-DC inverter, and perform power transmission;

[0011] Control and monitoring unit: used to monitor the power generation state of the lifting motor of the lifting equipment and send a control signal to the bidirectional DC-DC conversion module, and control the bidirectional DC-DC conversion module to convert the electric energy absorbed by the DC bus of the lifting inverter of the lifting equipment;

[0012] The lifting inverter of the lifting equipment is connected to the first end of the low-voltage DC busbar through the bidirectional DC-DC conversion module, the high-power battery pack is connected to the second end of the low-voltage DC busbar, the third end of the low-voltage DC busbar is connected to the AC-DC inverter, and the AC-DC inverter is connected to the control and monitoring unit.

[0013] Furthermore, it also includes:

[0014] High-voltage DC circuit breaker: used to cut off the DC current, one end of the high-voltage DC circuit breaker is connected to the lifting inverter of the lifting equipment;

[0015] 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 high-voltage DC fuse is connected to the other end of the high-voltage DC circuit breaker, and the other end of the high-voltage DC fuse is connected to the high-voltage side of the bidirectional DC-DC conversion module.

[0016] Furthermore, it also includes:

[0017] 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 bidirectional DC-DC conversion module, and the other end of the low-voltage DC circuit breaker is connected to the high-power battery pack.

[0018] Furthermore, it also includes:

[0019] Braking resistor: used to convert the electric energy of the lifting motor of the lifting equipment into heat energy; the braking resistor is connected in parallel with the lifting inverter of the lifting equipment and the high-voltage side of the bidirectional DC-DC conversion module.

[0020] 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.

[0021] Furthermore, the status indicators of the high-power battery pack include voltage, temperature, input current and output current.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] 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 voltage of the inverter DC bus is higher than the set threshold, power is returned to the inverter DC bus at this time, and the control monitoring unit sends a control signal to the bidirectional DC-DC conversion module according to the monitored power generation state, so that the 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 detected that the 380V incoming line of the lifting equipment fails, the AC-DC inverter starts to discharge, and power is supplied from the high-power battery pack to the 380V incoming line of the lifting equipment to maintain the emergency operation of the lifting equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A structural block diagram of a lifting equipment energy recovery emergency power supply system based on a high-power battery provided in an embodiment of the utility model;

[0025] Figure 2 A schematic diagram of the structure of a lifting equipment energy recovery emergency power supply system based on a high-power battery provided in an embodiment of the utility model;

[0026] In the figure:

[0027] 1- lifting equipment lifting inverter, 2- high voltage DC circuit breaker, 3- high voltage DC fuse, 4- bidirectional DC-DC conversion module, 5- low voltage DC busbar, 6- low voltage DC circuit breaker, 7- high power battery pack, 8- control monitoring unit, 9- AC / DC inverter, 10- AC fuse, 11, AC circuit breaker, R- brake resistor. DETAILED DESCRIPTION

[0028] 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.

[0029] See also Figure 1 This embodiment provides a lifting equipment energy recovery emergency power supply system based on a high-power battery, including:

[0030] Lifting equipment lifting inverter 1: used to supply power to the lifting motor of the lifting equipment;

[0031] Bidirectional DC-DC conversion module 4: used to monitor the voltage of the DC bus on the lifting inverter 1 of the lifting equipment, and adjust the power supply voltage of the lifting inverter 1 of the lifting equipment according to a preset control process;

[0032] High-power battery pack 7: used to store the electric energy converted by the bidirectional DC-DC conversion module 4, and to supply power to the lifting inverter 1 of the lifting equipment through the bidirectional DC-DC conversion module 4 after the lifting equipment loses power;

[0033] AC / DC inverter 9: used to invert the electric energy released by the high-power battery pack 7;

[0034] Low voltage DC busbar 5: used to connect the bidirectional DC-DC conversion module 4, the high power battery pack 7 and the AC-DC inverter 9, and to transmit electric energy;

[0035] The control monitoring unit 8 is used to monitor the power generation state of the lifting motor of the lifting equipment and send a control signal to the bidirectional DC-DC conversion module 4, and control the bidirectional DC-DC conversion module 4 to convert the electric energy absorbed by the DC bus of the lifting inverter 1 of the lifting equipment.

[0036] 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 the bidirectional DC-DC conversion module, 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 the bidirectional DC-DC conversion module, 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 bidirectional DC-DC conversion module 4, the high-power battery pack 7 and the AC-DC inverter 9, and to transmit electric energy.

[0037] The lifting inverter 1 of the lifting equipment is connected to the first end of the low-voltage DC bus 5 through the bidirectional DC-DC conversion module 4, the high-power battery pack 7 is connected to the second end of the low-voltage DC bus 5, the third end of the low-voltage DC bus 5 is connected to the AC-DC inverter 9, and the AC-DC inverter 9 is connected to the control and monitoring unit 8.

[0038] Among them, the preset control process is:

[0039] When the lifting motor of the lifting equipment is in the power generation state and the DC bus voltage of the lifting inverter 1 of the lifting equipment is greater than the threshold value, the bidirectional DC-DC conversion module 4 converts the electric energy absorbed on the DC bus of the lifting inverter 1 of the lifting equipment to charge the high-power battery pack 7;

[0040] When the 380V incoming line of the lifting equipment is in a power outage state, the AC / DC inverter 9 releases the electric energy in the high-power battery pack 7 to the 380V incoming line of the lifting equipment to provide electric energy for the lifting equipment.

[0041] Specifically, when the lifting equipment is working, when the bidirectional DC-DC module 4 detects that the DC bus voltage of the lifting inverter 1 of the lifting equipment rises to higher than the set threshold, and receives the lifting motor descending signal sent by the control monitoring unit 8, the bidirectional DC-DC module 4 converts the electric energy absorbed from the DC bus of the lifting inverter 1 of the lifting equipment to charge the high-power battery pack 7, and absorbs the electric energy returned from the DC bus of the lifting inverter 1 of the lifting equipment 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 lifting equipment is lower than the set threshold, the bidirectional DC-DC 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 lifting equipment, maintains voltage stability, and promotes efficient operation of the equipment.

[0042] When the 380V incoming line of the lifting equipment is in a fault and loses power, and the bidirectional DC-DC conversion module 4 detects that the voltage of the lifting inverter 1 of the lifting equipment is lower than the threshold, the AC-DC inverter 9 inverts and releases the electric energy in the high-power battery pack 7 to the 380V incoming line of the lifting equipment to provide emergency power supply for the lifting equipment.

[0043] Specifically, when the AC / DC inverter 9 detects that the 380V incoming line of the lifting equipment is in a faulty and power-off state, and the bidirectional DC-DC conversion module 4 detects that the voltage of the lifting inverter 1 of the lifting equipment is lower than the threshold, the AC / DC inverter 9 inverts and releases the electric energy in the high-power battery pack 7 to the 380V incoming line of the lifting equipment, providing emergency power supply for the lifting equipment and maintaining the emergency operation of the lifting equipment.

[0044] See also Figure 2 , which also includes:

[0045] High-voltage DC circuit breaker 2: used to cut off the DC current, one end of the high-voltage DC circuit breaker 2 is connected to the lifting inverter 1 of the lifting equipment;

[0046] High-voltage DC fuse 3: 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 high-voltage DC fuse 3 is connected to the other end of the high-voltage DC circuit breaker 2, and the other end of the high-voltage DC fuse 3 is connected to the high-voltage side of the bidirectional DC-DC conversion module 4.

[0047] Specifically, the 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 high-voltage DC circuit breaker 2 is connected to the lifting inverter 1 of the lifting equipment, and the other end of the high-voltage DC circuit breaker 2 is connected to the high-voltage DC fuse 3. The function of the 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 the power grid equipment and personnel.

[0048] Specifically, the high-voltage DC fuse 3 is a DC protection device, which automatically blows when the current in the system is greater than the rated resistance of the high-voltage DC fuse to protect the safety of the equipment. One end of the high-voltage DC fuse 3 is connected to the high-voltage DC circuit breaker 2, and the other end of the high-voltage DC fuse 3 is connected to the high-voltage side of the bidirectional DC-DC conversion module 4, and the bidirectional DC-DC conversion module 4 performs DC voltage detection with the lifting inverter 1 of the lifting equipment.

[0049] Among them, it also includes:

[0050] 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 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 .

[0051] 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 for battery management. 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 grid equipment and personnel.

[0052] Among them, it also includes:

[0053] AC circuit breaker 11: used to cut off the DC current; one end of the high-voltage DC circuit breaker 11 is connected to the 380V incoming line of the lifting equipment;

[0054] AC fuse 10: used to fuse and protect the lifting equipment when the current is greater than the rated value; one end of the AC fuse 10 is connected to the other end of the AC circuit breaker 11, and the other end of the AC fuse 10 is connected to the AC side of the AC / DC inverter 9.

[0055] Specifically, the AC circuit breaker 11 is an AC switch device, with six fixing screws on the top and bottom, respectively, for the three phases A, B, and C. One end of the AC circuit breaker 11 is connected to the 380V incoming line of the lifting equipment, and the other end of the AC circuit breaker 11 is connected to the AC fuse 10. The function of the AC circuit breaker 11 is to control the overload and short circuit of the AC circuit in the AC 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.

[0056] Among them, it also includes:

[0057] Braking resistor R: used to convert the electric energy of the lifting motor of the lifting equipment into heat energy; the braking resistor R is connected in parallel with the high-voltage side of the lifting inverter 1 of the lifting equipment and the bidirectional DC-DC conversion module 4.

[0058] Specifically, during normal operation, the energy returned by the lifting equipment is first stored in the high-power battery pack 7. 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.

[0059] 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.

[0060] 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. The control monitoring unit 8 sends a control signal to the DC-DC conversion module 4 through CAN communication. The control monitoring unit 8 tracks the working 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 detects that the DC bus voltage of the lifting inverter 1 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.

[0061] The status indicators of the high-power battery pack 7 include voltage, temperature, input current and output current.

[0062] 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.

[0063] 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.

[0064] 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 voltage of the inverter DC bus is higher than the set threshold, power is returned to the inverter DC bus at this time, and the control monitoring unit sends a control signal to the bidirectional DC-DC conversion module according to the monitored power generation state, so that the 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 detected that the 380V incoming line of the lifting equipment fails, the AC-DC inverter starts to discharge, and power is supplied from the high-power battery pack to the 380V incoming line of the lifting equipment to maintain the emergency operation of the lifting equipment.

[0065] 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 emergency power supply system based on high-power batteries, characterized in that: include: Lifting equipment lifting inverter: used to supply power to the lifting motor of the lifting equipment; Bidirectional DC-DC conversion module: used to monitor the voltage of the DC bus on the lifting inverter of the lifting equipment and adjust the power supply voltage of the lifting inverter of the lifting equipment; High-power battery pack: used to store the electric energy converted by the bidirectional DC-DC conversion module, and to supply power to the lifting inverter of the lifting equipment through the bidirectional DC-DC conversion module after the lifting equipment loses power; AC / DC inverter: used to invert the electric energy released by the high-power battery pack; Low-voltage DC busbar: used to connect the bidirectional DC-DC conversion module, the high-power battery pack and the AC-DC inverter, and perform power transmission; Control and monitoring unit: used to monitor the power generation state of the lifting motor of the lifting equipment and send a control signal to the bidirectional DC-DC conversion module, and control the bidirectional DC-DC conversion module to convert the electric energy absorbed by the DC bus of the lifting inverter of the lifting equipment; The lifting inverter of the lifting equipment is connected to the first end of the low-voltage DC busbar through the bidirectional DC-DC conversion module, the high-power battery pack is connected to the second end of the low-voltage DC busbar, the third end of the low-voltage DC busbar is connected to the AC-DC inverter, and the AC-DC inverter is connected to the control and monitoring unit.

2. The energy recovery emergency power supply system for lifting equipment based on high-power batteries according to claim 1 is characterized in that: Also includes: High-voltage DC circuit breaker: used to cut off the DC current, one end of the high-voltage DC circuit breaker is connected to the lifting inverter of the lifting equipment; 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 high-voltage DC fuse is connected to the other end of the high-voltage DC circuit breaker, and the other end of the high-voltage DC fuse is connected to the high-voltage side of the bidirectional DC-DC conversion module.

3. The energy recovery emergency power supply 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 bidirectional DC-DC conversion module, and the other end of the low-voltage DC circuit breaker is connected to the high-power battery pack.

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

5. The energy recovery emergency power supply 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.

6. The energy recovery emergency power supply system for lifting equipment based on high-power batteries according to claim 5 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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