Multi-elevator energy-saving device
Through the control strategy and structural design of multiple elevator energy-saving devices, the problems of complex control and high cost of elevator energy storage devices have been solved. This has enabled the efficient storage and distribution of electricity generated by elevator traction machines, reduced the manufacturing cost of elevator energy-saving devices, and enhanced their market application value.
Patent Information
- Application Number
- CN202520042679.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-01-08
AI Technical Summary
In existing technologies, the control of elevator energy storage devices is complex and difficult to adapt to the needs of multiple elevators, resulting in control difficulties and high costs.
The system employs a multi-elevator energy-saving device, including an elevator drive unit, a battery stack, a controller, and an overcurrent protection unit. By connecting anti-reverse diodes and bypass relays in parallel, the charging and discharging state of the battery stack is controlled, thereby enabling the storage and distribution of electrical energy generated by the elevator traction machine.
It achieves efficient storage and distribution of electrical energy in multi-elevator systems, reduces manufacturing costs, and enhances market application value.
Smart Images
Figure CN223898988U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of power electronic converter technology and battery energy storage technology, and particularly relates to the field of converter, battery energy storage, elevator drive and the like. BACKGROUND
[0002] Elevators provide vertical lifting transportation services for human beings, and based on the development of various technologies, especially power electronic technology, elevators have been greatly improved in control and rideability. With the increasing requirement for energy saving and emission reduction in modern society, people have begun to focus on the energy saving of elevator operation. By adding an energy storage device to the elevator drive link, energy saving of the elevator can be achieved to some extent. When the weight on the elevator car side is greater than the weight on the counterweight side, the elevator hoist machine is working in a power generation state when descending, and its electric energy is returned to the DC bus through the drive converter. The traditional elevator dissipates this part of energy through parallel brake resistors, otherwise the DC bus voltage will rise, leading to an accident. The principle of the elevator energy storage device is to parallel a storage device on the DC bus, which stores the electric energy output by the hoist machine instead of dissipating it with brake resistors. The energy stored in the energy storage device is returned to the DC bus at appropriate times, and the elevator operates in an energy-saving manner through this mode.
[0003] Due to the complex working state of the elevator and the energy storage device, the elevator has ascending and descending, and the load of the car changes randomly, and the state of charge (SOC) of the energy storage device dynamically changes with the working time. The complex working conditions make it difficult to determine the working state of the elevator energy storage device, causing control difficulties. In addition, the current research on the elevator energy storage device is aimed at the energy storage device of a single elevator. In fact, with the trend of large-scale and high-rise buildings, multiple elevators in a building are the mainstream trend. If each elevator is equipped with a set of energy storage devices, it is obviously not suitable for the progress of the times. SUMMARY
[0004] Therefore, the utility model provides a kind of multiple elevator energy saving device and control method, the energy saving device can store the electric energy that hoist machine is in power generation state and is sent in battery stack, when the SOC capacity of battery stack is lower than set threshold value, stop battery stack to supply power to DC bus, when the SOC capacity of system battery stack is higher than set threshold value, restore battery stack to supply power to DC bus, battery stack enters automatic charging and discharging mode at this time.
[0005] In a first aspect, the utility model provides a kind of multiple elevator energy saving device, comprising:
[0006] elevator drive unit;
[0007] battery stack;
[0008] controller
[0009] Overcurrent protection unit;
[0010] in:
[0011] The elevator drive unit includes a voltage sensor, a current sensor, and n frequency converters, each of which drives one traction machine; the input terminals of each frequency converter are connected to the municipal power grid to obtain power from the municipal power grid; each frequency converter is equipped with a DC bus, which is connected in parallel with the common bus of the elevator drive unit;
[0012] The battery stack + terminal is connected to the common bus + terminal of the elevator drive unit through the controller and the overcurrent protection unit, and the battery stack - terminal is connected to the common bus - terminal of the elevator drive unit through the controller and the overcurrent protection unit.
[0013] The controller employs a parallel connection of a reverse protection diode and a bypass relay. During normal operation, the bypass relay is closed, and the reverse protection diode is in a bypass state, at which point the battery stack is in normal charging and discharging mode. When the battery stack's SOC capacity falls below a first set threshold, the bypass relay is disconnected, and the single-phase conduction capability of the reverse protection diode is utilized to stop the battery stack from supplying power to the DC bus. At this point, only unidirectional charging of the battery stack by the DC bus is allowed. When the battery stack's SOC capacity exceeds the first set threshold, the bypass relay is closed, restoring the battery stack's power supply to the DC bus. At this point, the battery stack enters an automatic charging and discharging mode.
[0014] The controller performs control based on the voltage sensor and the current sensor;
[0015] The overcurrent protection unit activates when the current of the elevator drive unit exceeds a second set threshold, disconnecting the battery stack from the common bus.
[0016] This elevator energy-saving device can provide the electricity generated by the elevator traction machine in generator mode to other elevators in parallel circuits. It can also store the electricity from multiple elevator energy-saving devices for use by elevators, achieving the effect of supplementing the power of the charger. This reduces the manufacturing cost of the elevator energy-saving device and enhances its commercial value and application in the market.
[0017] In one optional embodiment, the battery stack includes a battery management system and m battery modules connected in series, with the + end of the first battery module being the + end of the battery stack and the - end of the last battery module being the - end of the battery stack.
[0018] In one optional embodiment, the battery module includes a battery module management system and k individual batteries connected in series, with the positive terminal of the first individual battery being the positive terminal of the battery module and the negative terminal of the last individual battery being the negative terminal of the battery module.
[0019] In one alternative implementation, the battery stack voltage is consistent with the common bus voltage of the elevator drive unit.
[0020] In one alternative implementation, the multi-elevator energy-saving device further includes a remote communication unit.
[0021] In one alternative embodiment, the single battery cell is a lithium-ion battery or a sodium-ion battery.
[0022] Secondly, this utility model provides a control method for multiple elevator energy-saving devices, applicable to the multiple elevator energy-saving devices described in the first aspect above or any corresponding embodiment thereof, the method comprising:
[0023] The controller employs a parallel connection of a reverse protection diode and a bypass relay. During normal operation, the bypass relay is closed, and the reverse protection diode is in a bypass state, at which point the battery stack is in normal charging and discharging mode. When the battery stack's SOC capacity falls below a first set threshold, the bypass relay is disconnected, and the single-phase conduction capability of the reverse protection diode is utilized to stop the battery stack from supplying power to the DC bus. At this point, only unidirectional charging of the battery stack by the DC bus is allowed. When the battery stack's SOC capacity exceeds the first set threshold, the bypass relay is closed, restoring the battery stack's power supply to the DC bus. At this point, the battery stack enters an automatic charging and discharging mode.
[0024] This elevator energy-saving device, through control strategies and methods, can provide the electricity generated by the elevator traction machine in the generator state to other elevators in the parallel circuit. It can also store the electricity for use by multiple elevator energy-saving devices, avoiding over-discharge of energy from the energy storage stack and achieving the effect of replenishing the charger. This reduces the manufacturing cost of the elevator energy-saving device and enhances its commercial value and application in the market. Attached Figure Description
[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of a first application example of a multi-elevator energy-saving device according to this utility model;
[0027] Figure 2 This is a schematic diagram of the controller structure of this utility model;
[0028] Figure 3 This is a schematic diagram of the battery stack structure of this utility model;
[0029] Figure 4 This is a schematic diagram of the battery module structure of this utility model;
[0030] Figure 5 This is a schematic diagram of a second application example of the multi-elevator energy-saving device of this utility model. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0034] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0035] To at least partially address the problems existing in the prior art, such as the difficulty in controlling the charging of battery stacks by power grid or traction machine generators, this utility model provides a multi-elevator energy-saving device. The multi-elevator energy-saving device includes:
[0036] Elevator drive unit;
[0037] Battery stack;
[0038] Controller;
[0039] Overcurrent protection unit;
[0040] in:
[0041] The elevator drive unit includes a voltage sensor, a current sensor, and n frequency converters, each of which drives one traction machine. The input terminals of each frequency converter are connected to the municipal power grid to obtain power from the grid. Each frequency converter is equipped with a DC bus, which is connected in parallel with the common bus of the elevator drive unit.
[0042] The battery stack + terminal is connected to the common bus + terminal of the elevator drive unit through the controller and overcurrent protection unit, and the battery stack - terminal is connected to the common bus - terminal of the elevator drive unit through the controller and overcurrent protection unit.
[0043] The controller uses a parallel connection of a reverse protection diode and a bypass relay. During normal operation, the bypass relay is closed and the reverse protection diode is in the bypass state, at which time the battery stack is in normal charging and discharging state. When the SOC capacity of the battery stack is lower than the first set threshold, the bypass relay is opened, and the single-phase conduction performance of the reverse protection diode is used to stop the battery stack from supplying power to the DC bus. At this time, only the DC bus is allowed to charge the battery stack in one direction. When the SOC capacity of the battery stack is higher than the first set threshold, the bypass relay is closed, and the battery stack resumes supplying power to the DC bus. At this time, the battery stack enters the automatic charging and discharging mode.
[0044] The controller uses voltage and current sensors for control.
[0045] The overcurrent protection unit activates when the current in the elevator drive unit exceeds the second set threshold, disconnecting the battery stack from the common bus.
[0046] The first and second threshold values are set according to the specific operating conditions.
[0047] The battery stack includes a battery management system and m battery modules connected in series. The + terminal of the first battery module is the + terminal of the battery stack, and the - terminal of the last battery module is the - terminal of the battery stack.
[0048] The battery module consists of k individual cells connected in series. The positive terminal of the first individual cell is the positive terminal of the battery module, and the negative terminal of the last individual cell is the negative terminal of the battery module.
[0049] The battery stack voltage is consistent with the common bus voltage of the elevator drive unit.
[0050] The multi-elevator energy-saving device also includes a remote communication unit.
[0051] The individual cells are lithium-ion batteries and sodium-ion batteries.
[0052] This elevator energy-saving device can provide the electricity generated by the elevator traction machine in generator mode to other elevators in parallel circuits. It can also store the electricity from multiple elevator energy-saving devices for use by elevators, achieving the effect of supplementing the power of the charger. This reduces the manufacturing cost of the elevator energy-saving device and enhances its commercial value and application in the market.
[0053] Figure 1 This is a schematic diagram of the first application example of a multi-elevator energy-saving device according to this utility model. Figure 1 The multi-elevator energy-saving device shown includes an elevator drive unit 1, a battery stack 2, a controller 3, and an overcurrent protection unit 4.
[0054] The battery stack 2+ terminal is connected to the common bus + terminal of the elevator drive unit 1 through the controller 3 and the overcurrent protection unit 4, and the battery stack 2- terminal is connected to the common bus - terminal of the elevator drive unit 1 through the controller 3 and the overcurrent protection unit 4.
[0055] The elevator drive unit 1 includes n frequency converters 11, each driving one traction machine. Each frequency converter has a +DC bus terminal and a -DC bus terminal, and these terminals are connected to the + and - terminals of a common bus, respectively. The elevator drive unit 1 includes several voltage sensors 12 and current sensors 13 for detecting the operating status of the elevator drive unit. The outputs of the voltage sensors 12 and current sensors 13 can be used to control the controller 3. The mains power grid provides power to the frequency converters.
[0056] Figure 2 This is a schematic diagram of the controller structure of this utility model. See also: Figure 2The controller uses a parallel connection of a reverse protection diode D1 and a bypass relay K1 in the main circuit. The switch in the bypass relay K1 is connected in parallel with the reverse protection diode D1 and then connected in series between the battery stack 2 and the overcurrent protection unit 4. The coil in the bypass relay K1 is connected in series in the power supply circuit. During normal operation, the bypass relay K1 is closed, and the reverse protection diode D1 is in a bypass state, at which time the battery stack 2 is in a normal charging and discharging state. When the SOC capacity of the battery stack is lower than the first set threshold, the bypass relay K1 is opened, and the single-phase conduction performance of the reverse protection diode is used to stop the battery stack 2 from supplying power to the DC bus. At this time, only unidirectional charging of the battery stack 2 by the DC bus is allowed. When the SOC capacity of the battery stack is higher than the first set threshold, the bypass relay K1 is closed, restoring the battery stack 2 to supply power to the DC bus, at which point the battery stack 2 enters an automatic charging and discharging mode.
[0057] Figure 3 This is a schematic diagram of the battery stack 2 structure of this utility model. See also... Figure 3 The battery stack 2 includes a battery management system 21 and m battery modules 22 connected in series. The + end of the first battery module is the + end of the battery stack, and the - end of the last battery module is the - end of the battery stack.
[0058] Figure 4 This is a schematic diagram of the battery module structure of this utility model. (As shown) Figure 4 As shown, the battery module 22 includes a battery module management system 221 and k individual batteries 222. The individual batteries are connected in series. The positive terminal of the first individual battery is the positive terminal of the battery module 22, and the negative terminal of the last individual battery is the negative terminal of the battery module 22.
[0059] Figure 5 This is a schematic diagram of a second application of the multi-elevator energy-saving device of this utility model. The second application example of the multi-elevator energy-saving device is based on the first application example, with the addition of a remote communication unit 5. The remote communication unit 5 can send the real-time operating status of the multi-elevator energy-saving device to the upper-level control system, or the upper-level control system can issue instructions to the multi-elevator energy-saving device.
[0060] This utility model also provides a control method for multiple elevator energy-saving devices, applicable to... Figure 1 or Figure 5 The multi-elevator energy-saving device shown includes the following control methods:
[0061] The controller uses a reverse protection diode D1 connected in parallel with a bypass relay K1. During normal operation, the bypass relay K1 is closed and the reverse protection diode D1 is in a bypass state, at which time the battery stack is in normal charging and discharging state. When the state of charge (SOC) of the battery stack is lower than the first set threshold, the bypass relay K1 is opened, and the single-phase conduction performance of the reverse protection diode D1 is used to stop the battery stack from supplying power to the DC bus. At this time, only the DC bus is allowed to charge the battery stack in one direction. When the state of charge (SOC) of the battery stack is higher than the first set threshold, the bypass relay K1 is closed, and the battery stack resumes supplying power to the DC bus. At this time, the battery stack enters the automatic charging and discharging mode.
[0062] This elevator energy-saving device, through control strategies and methods, can provide the electricity generated by the elevator traction machine in the generator state to other elevators in the parallel circuit. It can also store the electricity for use by multiple elevator energy-saving devices, avoiding over-discharge of energy from the energy storage stack and achieving the effect of replenishing the charger. This reduces the manufacturing cost of the elevator energy-saving device and enhances its commercial value and application in the market.
[0063] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes (but is not limited to) various media capable of storing program code, such as read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.
[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A multi-elevator energy-saving device, characterized in that, The device includes: Elevator drive unit; Battery stack; Controller; Overcurrent protection unit; in: The elevator drive unit includes a voltage sensor, a current sensor, and n frequency converters, each of which drives one traction machine; the input terminals of each frequency converter are connected to the municipal power grid to obtain power from the municipal power grid; each frequency converter is equipped with a DC bus, which is connected in parallel with the common bus of the elevator drive unit; The battery stack + terminal is connected to the common bus + terminal of the elevator drive unit through the controller and the overcurrent protection unit, and the battery stack - terminal is connected to the common bus - terminal of the elevator drive unit through the controller and the overcurrent protection unit. The controller employs a parallel connection of a reverse protection diode and a bypass relay. During normal operation, the bypass relay is closed, and the reverse protection diode is in a bypass state, at which point the battery stack is in normal charging and discharging mode. When the battery stack's SOC capacity falls below a first set threshold, the bypass relay is disconnected, and the single-phase conduction capability of the reverse protection diode is utilized to stop the battery stack from supplying power to the DC bus. At this point, only unidirectional charging of the battery stack by the DC bus is allowed. When the battery stack's SOC capacity exceeds the first set threshold, the bypass relay is closed, restoring the battery stack's power supply to the DC bus. At this point, the battery stack enters an automatic charging and discharging mode. The controller performs control based on the voltage sensor and the current sensor; The overcurrent protection unit activates when the current of the elevator drive unit exceeds a second set threshold, disconnecting the battery stack from the common bus.
2. The multi-elevator energy-saving device according to claim 1, characterized in that, The battery stack includes a battery management system and m battery modules connected in series. The + end of the first battery module is the + end of the battery stack, and the - end of the last battery module is the - end of the battery stack.
3. The multi-elevator energy-saving device according to claim 2, characterized in that, The battery module includes a battery module management system and k individual batteries connected in series. The positive terminal of the first individual battery is the positive terminal of the battery module, and the negative terminal of the last individual battery is the negative terminal of the battery module.
4. The multi-elevator energy-saving device according to claim 1, characterized in that, The voltage of the battery stack is consistent with the common bus voltage of the elevator drive unit.
5. The multi-elevator energy-saving device according to claim 1, characterized in that, The multi-elevator energy-saving device also includes a remote communication unit.
6. The multi-elevator energy-saving device according to claim 3, characterized in that, The individual battery cells are lithium-ion batteries and sodium-ion batteries.