Method, device, electronic equipment and storage medium for protecting normal operation of an elevator
By monitoring the elevator bus voltage in real time and adjusting the excitation current, the problem of bus overvoltage during automatic rescue operation of four-quadrant frequency converter elevators was solved, achieving cost control and safety assurance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANGHAI SIGRINER STEP ELECTRIC
- Filing Date
- 2023-03-13
- Publication Date
- 2026-06-16
Smart Images
Figure CN116462068B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of elevator technology, and in particular to a method, apparatus, electronic device, and storage medium for protecting the normal operation of an elevator. Background Technology
[0002] To prevent people from being trapped in elevators due to power outages during operation, elevators are usually equipped with an emergency power supply to provide temporary power to the elevator control cabinet during power outages. This allows the elevator inverter to drive the traction machine to perform "automatic rescue" (also known as "emergency rescue") – moving the car to the nearest landing and opening the doors to release passengers.
[0003] Emergency power supplies often lack the capacity and power to support the traction machine in pulling the car to the landing during automatic rescue operation, leading to rescue failure. In this context, elevators using two-quadrant frequency converters operate in generator mode for automatic rescue. This is because the elevator frequency converter is equipped with a braking resistor; the electrical energy generated in generator mode can be released through the braking resistor, thus preventing bus overvoltage and ensuring the normal operation of automatic rescue.
[0004] However, four-quadrant frequency converters typically do not have braking resistors in their control circuits, making it difficult to release the electrical energy generated during automatic rescue operations in generator mode. Therefore, in elevators using four-quadrant frequency converters, controlling costs while ensuring normal automatic rescue operations becomes a pressing issue. Summary of the Invention
[0005] The purpose of this invention is to provide a method, device, electronic equipment, and storage medium for protecting the normal operation of elevators, so as to ensure the normal automatic rescue operation of elevators using four-quadrant frequency converters without increasing costs, thereby ensuring the safety of elevator passengers.
[0006] To achieve the above objectives, embodiments of the present invention provide a method for protecting the normal operation of an elevator, comprising: monitoring the real-time voltage of the elevator busbar during automatic rescue operation in generator mode; determining whether the real-time voltage of the busbar exceeds a preset voltage threshold; and adjusting the excitation current of the elevator traction machine to increase the excitation current when the real-time voltage of the busbar exceeds the preset voltage threshold.
[0007] The present invention also provides a device for protecting the normal operation of an elevator, comprising: a voltage monitoring module for monitoring the real-time voltage of the elevator busbar when the elevator is in automatic rescue operation in power generation mode; a judgment module for judging whether the real-time voltage of the busbar exceeds a preset voltage threshold; and an excitation control module for adjusting the excitation current of the elevator to increase the excitation current when the real-time voltage of the busbar exceeds the preset voltage threshold.
[0008] Embodiments of the present invention also provide an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the above-described method for protecting the normal operation of an elevator.
[0009] Embodiments of the present invention also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-described method for protecting the normal operation of an elevator.
[0010] In at least one embodiment of this application, during automatic rescue operation in elevator power generation mode, the real-time voltage of the elevator bus is monitored; it is determined whether the real-time voltage of the bus exceeds a preset voltage threshold; when the real-time voltage of the bus exceeds the preset voltage threshold, the excitation current of the elevator is adjusted to increase the excitation current. In this application, the elevator excitation current can be increased when the real-time voltage of the bus exceeds the preset voltage threshold, thereby increasing the power loss during automatic rescue operation and ensuring that the generated power during automatic rescue does not exceed the power loss. Consequently, during automatic rescue operation in elevator power generation mode, there will be no excess regenerated energy loaded on the bus capacitor, thus avoiding bus overvoltage, ensuring the normal operation of automatic rescue, and protecting the safety of elevator passengers. Attached Figure Description
[0011] One or more embodiments are illustrated by way of example with the corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.
[0012] Figure 1 This is a schematic diagram of the structure of an automatic elevator rescue system according to at least one embodiment of the present invention;
[0013] Figure 2 This is a flowchart illustrating a method for protecting the normal operation of an elevator according to at least one embodiment of the present invention;
[0014] Figure 3 This is a schematic diagram of the structure of a device for protecting the normal operation of an elevator according to at least one embodiment of the present invention;
[0015] Figure 4 This is a schematic diagram of a system for protecting the normal operation of an elevator according to at least one embodiment of the present invention;
[0016] Figure 5 This is a schematic diagram of the structure of an electronic device according to at least one embodiment of the present invention. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of the present invention to enable the reader to better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments.
[0018] To better understand this application, before introducing the technical solutions involved, the concepts involved in this application will first be explained:
[0019] Ordinary frequency converters can only control the motor to work in two quadrants, hence they are called two-quadrant frequency converters.
[0020] A frequency converter that enables a motor to operate in four quadrants (meaning that its operating mechanical characteristic curve can operate in all four quadrants on the mathematical axis) is called a four-quadrant frequency converter.
[0021] The four quadrants are as follows:
[0022] In the first quadrant, the motor is rotating in the forward direction, and energy is transferred from the frequency converter to the motor. The motor's speed and torque are both positive.
[0023] In the second quadrant, the motor operates in reverse feedback or deceleration braking mode, and the motor is in generator mode. Energy is transferred from the motor to the frequency converter, the speed is negative, and the torque is positive.
[0024] In the third quadrant, the motor runs in reverse, and energy is transferred from the frequency converter to the motor. The motor's speed and torque are both negative.
[0025] In the fourth quadrant, the motor rotates in a forward-return or deceleration braking mode, operating as a generator. Energy is transferred from the motor to the frequency converter, with positive speed and negative torque.
[0026] Currently, driven by the need to reduce costs, the capacity and power of emergency power supplies in elevators are becoming increasingly smaller, unable to support the traction machine operating in electric mode for extended periods under unbalanced loads. In this context, if the traction machine operates electrically during an automatic rescue operation, the emergency power supply may run out midway through the rescue, leading to rescue failure. In such cases, in automatic rescue scenarios with significant unbalanced forces, a generator mode is generally used, where the elevator moves towards the side where the car and counterweight are relatively heavier.
[0027] To help those skilled in the art better understand the scenarios and related technical details of automatic elevator rescue operation, the following section will use... Figure 1 The elevator automatic rescue system shown is used as an example for explanation.
[0028] In mains power (such as) Figure 1 Under normal conditions, as shown in the diagram (three-phase power supply L1, L2, L3), the emergency power supply device 101 directly supplies 380VAC mains power to the control cabinet 102. The frequency converter, powered by the mains power, drives the elevator traction machine 106 to control the elevator car 105. It should be noted that... Figure 1 The R, S, and T terminals shown are the input terminals of the three-phase power supply, and the U, V, and W terminals are the output terminals of the frequency converter.
[0029] In the event of a power outage, the emergency power supply device 101 supplies the electrical energy stored in the battery to the control cabinet 102 through a boost inverter. Then, the main board triggers the frequency converter to enter the ARD (automatic rescue device) operating mode. The traction machine 106 drives the car 105, stopping at the nearest floor 104 when lightly loaded and at the nearest floor 103 when heavily loaded, so as to release trapped passengers in a timely manner.
[0030] In the entire elevator system, there are motor losses and mechanical losses, as well as inverter standby losses and operating losses. During automatic rescue operation in generator mode, when the generated power exceeds the sum of the aforementioned losses, electrical energy will gradually accumulate on the bus capacitor, and the bus voltage will gradually increase over time.
[0031] In elevators using two-quadrant frequency converters, the elevator frequency converter is equipped with a braking resistor (see reference). Figure 1 The braking resistor (indicated by 1021) allows the electrical energy generated during automatic rescue in generator mode to be released, thus preventing bus overvoltage. Bus overvoltage can cause overheating and even damage to relays, indicator lights, and other components that are constantly energized. Therefore, in elevators using two-quadrant frequency converters, operating automatic rescue in generator mode can prevent bus overvoltage and ensure the normal operation of the elevator's automatic rescue function.
[0032] However, in elevators using four-quadrant frequency converters, the control circuit typically lacks a braking resistor to prevent bus overvoltage. Furthermore, during a power outage, the elevator frequency converter switches to emergency power supply. In this case, the regenerative energy generated during automatic rescue in generator mode cannot be released or fed back to the grid. This results in the inability to prevent bus overvoltage during automatic rescue operation.
[0033] For elevators using four-quadrant frequency converters, there are two methods in related technologies to prevent bus overvoltage during automatic rescue operation. One method is to increase the power capacity of the elevator's emergency power supply and operate the elevator in electric mode rather than generator mode during automatic rescue operation. This avoids generating regenerative energy and thus prevents bus voltage rise. The other method is to additionally configure a discharge resistor in the emergency power supply or the four-quadrant frequency converter (see reference...). Figure 1 The discharge resistor 1011 shown in the figure enables the elevator to operate in generator mode during automatic rescue operation. In this way, when the bus voltage rises, regenerative energy can be released through the discharge resistor, thereby avoiding bus overvoltage.
[0034] However, both of the above-mentioned methods for solving the bus overvoltage problem increase costs, which contradicts the enterprise's cost control requirements. Therefore, this application proposes a new automatic rescue operation control method that can achieve automatic rescue operation of the four-quadrant frequency converter without increasing the emergency power supply or adding a discharge resistor.
[0035] At least one embodiment of the present invention provides a method for protecting the normal operation of an elevator, thereby solving the problem of bus overvoltage that may occur during automatic rescue operation of an elevator using a four-quadrant frequency converter, while controlling the implementation cost. This method for protecting the normal operation of an elevator can be applied to an elevator control cabinet, an elevator frequency converter, or one of its chips. In this embodiment, firstly, during automatic rescue operation in generator mode, the real-time voltage of the elevator bus is monitored; it is determined whether the real-time voltage of the bus exceeds a preset voltage threshold; when the real-time voltage of the bus exceeds the preset voltage threshold, the excitation current of the elevator is adjusted to increase the excitation current.
[0036] The following details the implementation of the method for protecting the normal operation of the elevator in this embodiment. This content is only for understanding the implementation details of this solution and is not essential for its implementation. The specific process is as follows: Figure 2 As shown, the steps may include the following:
[0037] Step 201: When the elevator is in automatic rescue operation in power generation mode, monitor the real-time voltage of the elevator bus.
[0038] Step 202: Determine whether the real-time voltage of the bus exceeds a preset voltage threshold;
[0039] Step 203: When the real-time voltage of the bus exceeds the preset voltage threshold, adjust the excitation current of the elevator to increase the excitation current.
[0040] Understandably, the method for protecting the normal operation of an elevator provided in this embodiment is applicable to the application scenario of automatic rescue operation of an elevator in power generation mode. In step 201, in this scenario, the real-time voltage of the elevator bus is monitored.
[0041] In step 202, it is determined whether the real-time voltage of the bus exceeds a preset voltage threshold. It is worth noting that the preset voltage threshold involved in this step is pre-set and can be determined based on the rated voltage of the inverter bus.
[0042] In step 203, when the real-time voltage of the bus exceeds the preset voltage threshold, the excitation current of the elevator is increased, which can increase the power loss during the automatic rescue operation of the elevator, so that the power generated during the automatic rescue of the elevator is not higher than the power loss.
[0043] It is worth noting that in step 203, when the adjustment of the elevator traction machine's excitation current causes the real-time voltage of the bus to fall below a preset voltage threshold, the adjustment of the excitation current can be stopped, or it can continue. Further adjustment at this point can include both upward and downward adjustments of the excitation current, as long as the bus voltage remains within the preset voltage threshold. This is because the optimal excitation current may not be directly obtained by increasing the excitation current; the adjustment process is similar to PID control, involving overshoot and stabilization. Therefore, after adjusting the bus voltage to a safe voltage range, it is preferable to continue adjusting the excitation current.
[0044] In some embodiments, a preset adjustment threshold may be set for the proportion of the elevator excitation current adjustment, for example, 28% or 30%. In these embodiments, after step 203 includes adjusting the excitation current of the elevator traction machine to increase the excitation current when the real-time voltage of the bus exceeds the preset voltage threshold, it may further include: stopping the adjustment of the excitation current when the proportion of the excitation current adjustment is greater than the preset adjustment threshold.
[0045] If the excitation current of the elevator is adjusted too high, it may negatively impact the elevator's automatic rescue operation, thereby severely affecting the passenger experience. In this embodiment, controlling the adjustment ratio of the excitation current to not exceed a preset adjustment threshold can prevent the elevator from failing to perform automatic rescue operations due to excessive adjustment of the excitation current.
[0046] In some embodiments, after stopping the adjustment of the excitation current, the method may further include: adjusting the elevator's operating speed to reduce it to a level not lower than a preset speed threshold. In this embodiment, by reducing the elevator's operating speed when the excitation current is adjusted to the preset adjustment threshold, the power generation generated during automatic rescue can be indirectly reduced, ensuring that the power generation is not higher than the power loss, thereby preventing bus overvoltage from another perspective. This embodiment, in addition to adjusting the elevator's excitation current, provides an extra layer of protection for the elevator's normal automatic rescue operation, further guaranteeing the safe rescue of trapped passengers.
[0047] Furthermore, it is worth noting that in this embodiment, the adjustment of the elevator's operating speed is also limited, with the elevator's operating speed limited to a preset speed threshold to avoid excessively prolonging the rescue time for people trapped in the elevator.
[0048] In some embodiments, step 203, which involves adjusting the excitation current of the elevator to increase the excitation current when the real-time voltage of the bus exceeds a preset voltage threshold, may further include: superimposing the excitation adjustment control signal onto the initial excitation control signal, and using the superimposed excitation control signal to adjust the excitation current of the elevator to increase the excitation current.
[0049] In this embodiment, the excitation regulation control signal can be understood as a correction signal for the excitation current of the elevator. The result of its superposition with the initial excitation control signal can adjust the excitation current of the elevator to an ideal value (so that the real-time voltage of the bus does not exceed the excitation current value corresponding to the preset voltage threshold).
[0050] In some embodiments, adjusting the excitation current of the elevator using the superimposed excitation control signal to increase the excitation current may further include: transmitting the superimposed excitation control signal to a current regulator, so that the current regulator adjusts the excitation current of the elevator according to the superimposed excitation control signal to increase the excitation current.
[0051] In a more specific embodiment, the method for protecting the normal operation of the elevator involved in this embodiment can be as follows: Figure 4 The system 407 that protects the normal operation of the elevator is implemented. Figure 4The excitation correction module 403 shown determines the excitation regulation control signal based on the real-time voltage VdcFbk and the preset voltage threshold VdcLtd. This excitation regulation control signal, superimposed with the initial excitation current IdRef, is used to control the current regulator 404 (ACR, Automatic Current Regulator). The current regulator then outputs a signal to the pulse width modulation 405 (PWM, Pulse Width Modulation), and finally outputs a signal to the traction machine 406, thereby regulating the excitation current of the traction machine. It should be noted that if the adjustment ratio of the elevator's excitation current exceeds the preset adjustment threshold but the real-time voltage of the bus still fails to reach the normal range, the elevator's running speed can be adjusted to further regulate the real-time voltage of the bus. In this case, a speed correction module 401 can be added to the system to regulate the elevator's excitation current.
[0052] To help readers understand more clearly, the following example of automatic rescue when the elevator is lightly loaded will be used to illustrate the method for protecting the safe operation of the elevator provided in this embodiment:
[0053] The elevator travels between two floors when lightly loaded (see example). Figure 1 If a power outage occurs between floors 103 and 104 (as shown), the elevator will first come to an emergency stop between the two floors. Since the elevator is not at a level position and passengers are trapped inside the elevator car, the emergency power supply will automatically switch on, and the elevator will enter automatic rescue operation mode. At this time, due to the light load, the traction machine will pull the elevator car upwards.
[0054] During automatic emergency response operation, as the AFE (Active Front End) stops working, the unconsumed regenerated energy gradually accumulates on the bus capacitor, and the bus voltage begins to gradually increase.
[0055] like Figure 4 The excitation correction module 403 in the system shown monitors the actual bus voltage VdcFbk in real time and performs PID closed-loop regulation on the bus voltage. Its output is superimposed on the original excitation current IdRef to correct the excitation current of the traction machine during ARD operation, increase the power loss during the automatic elevator rescue operation, so that the power generated during the automatic elevator rescue is not higher than the power loss, thereby controlling the bus voltage below the preset voltage threshold VdcLtd or maintaining the bus voltage near the threshold value without rising.
[0056] Furthermore, when the elevator's excitation current adjustment ratio reaches the preset adjustment threshold, if the bus voltage still does not reach the safe range (i.e., is less than the preset voltage threshold), the speed correction module 401 can output a speed correction amount, which is then added to the initial running speed SpdRef and transmitted to the speed regulator 402 and subsequently to the current regulator 404. This indirectly reduces the power generation generated during automatic elevator rescue, adjusting it to no higher than the power loss, thereby controlling the bus voltage below the preset voltage threshold VdcLtd or maintaining the bus voltage near that threshold value without further increase.
[0057] It is worth noting that, Figure 4 The speed correction module 401 and excitation correction module 403 shown can be activated simultaneously to uniformly regulate the bus voltage, or one of them can be activated at the same time.
[0058] In this embodiment, during automatic rescue operation in power generation mode, the real-time voltage of the elevator bus is monitored; it is determined whether the real-time voltage of the bus exceeds a preset voltage threshold; when the real-time voltage of the bus exceeds the preset voltage threshold, the excitation current of the elevator is adjusted to increase the excitation current, and the adjustment of the excitation current is stopped when the real-time voltage of the bus does not exceed the preset voltage threshold. In this application, the excitation current of the elevator can be increased when the real-time voltage of the bus exceeds the preset voltage threshold, thereby increasing the power loss during automatic rescue operation and ensuring that the generated power during automatic rescue does not exceed the power loss. Consequently, during automatic rescue operation in power generation mode, there will be no excess regenerated energy loaded on the bus capacitor, thus avoiding bus overvoltage, ensuring the normal operation of automatic rescue, and protecting the safety of elevator passengers.
[0059] One embodiment of the present invention relates to a device for protecting the normal operation of an elevator, such as... Figure 3 As shown, it includes:
[0060] The voltage monitoring module 301 is used to monitor the real-time voltage of the elevator bus when the elevator is in automatic rescue operation in power generation mode.
[0061] The judgment module 302 is used to determine whether the real-time voltage of the bus exceeds a preset voltage threshold;
[0062] The excitation control module 303 is used to adjust the excitation current of the elevator to increase the excitation current when the real-time voltage of the bus exceeds a preset voltage threshold, and to stop adjusting the excitation current when the real-time voltage of the bus does not exceed the preset voltage threshold.
[0063] In some embodiments, the device for protecting the normal operation of the elevator may further include a speed correction module (not shown in the figure), which is used to stop adjusting the excitation current when the proportion of the adjustment of the excitation current is greater than a preset adjustment threshold, and adjust the running speed of the elevator to reduce the running speed to no less than a preset speed threshold.
[0064] In some embodiments, the excitation control module 303 can also be used to superimpose the excitation adjustment control signal onto the initial excitation control signal, and use the superimposed excitation control signal to adjust the excitation current of the elevator to increase the excitation current.
[0065] In some embodiments, the excitation control module 303 can also be used to transmit the superimposed excitation control signal to the current regulator, so that the current regulator can adjust the excitation current of the elevator according to the superimposed excitation control signal to increase the excitation current.
[0066] The device for protecting the normal operation of an elevator provided in this embodiment monitors the real-time voltage of the elevator busbar during automatic rescue operation in generator mode; determines whether the real-time voltage of the busbar exceeds a preset voltage threshold; when the real-time voltage of the busbar exceeds the preset voltage threshold, adjusts the excitation current of the elevator to increase the excitation current, and stops adjusting the excitation current when the real-time voltage of the busbar does not exceed the preset voltage threshold. In this application, the excitation current of the elevator can be increased when the real-time voltage of the busbar exceeds the preset voltage threshold, thereby increasing the power loss during automatic rescue operation of the elevator, so that the generated power during automatic rescue operation of the elevator does not exceed the power loss. Consequently, during automatic rescue operation in generator mode, there will be no excess regenerated electrical energy loaded on the busbar capacitor, thus avoiding busbar overvoltage, ensuring the normal operation of automatic rescue operation of the elevator, and protecting the safety of elevator passengers.
[0067] It is worth mentioning that all modules involved in the above embodiments of the present invention are logical modules. In practical applications, a logical unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. Furthermore, to highlight the innovative aspects of the present invention, this embodiment does not introduce units that are not closely related to solving the technical problem proposed by the present invention; however, this does not mean that other units are absent from this embodiment.
[0068] Embodiments of the present invention also provide an electronic device, such as... Figure 5As shown, it includes at least one processor 501; and a memory 502 communicatively connected to the at least one processor 501; wherein the memory 502 stores instructions that can be executed by the at least one processor 501, and the instructions are executed by the at least one processor 501 to enable the at least one processor 501 to perform the above-described method for protecting the normal operation of the elevator.
[0069] The memory 502 and processor 501 are connected via a bus, which can include any number of interconnecting buses and bridges. The bus connects various circuits of one or more processors 501 and memory 502 together. The bus can also connect various other circuits, such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. A bus interface provides an interface between the bus and the transceiver. The transceiver can be a single element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices over a transmission medium. Data processed by processor 501 is transmitted over a wireless medium via an antenna, which further receives data and transmits it to processor 501.
[0070] Processor 501 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. Memory 502 can be used to store data used by processor 501 during operation.
[0071] The above-mentioned products can perform the methods provided in the embodiments of this application, and have the corresponding functional modules and beneficial effects of performing the methods. For technical details not described in detail in this embodiment, please refer to the methods provided in the embodiments of this application.
[0072] Embodiments of this application also provide a computer-readable storage medium storing a computer program. When executed by a processor, the computer program implements the above-described method for protecting the normal operation of an elevator.
[0073] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.
[0074] The above embodiments are provided for those skilled in the art to implement and use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present application. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should conform to the maximum scope of the innovative features mentioned in the claims.
Claims
1. A method for protecting the normal operation of an elevator, characterized in that, The method, applied to elevator systems using four-quadrant frequency converters, includes: When the elevator is in automatic rescue mode in power generation mode, the real-time voltage of the elevator bus is monitored. Determine whether the real-time voltage of the bus exceeds a preset voltage threshold; When the real-time voltage of the bus exceeds a preset voltage threshold, the excitation current of the elevator traction machine is adjusted to increase the excitation current. The step of adjusting the excitation current of the elevator to increase the excitation current when the real-time voltage of the bus exceeds a preset voltage threshold includes: The excitation regulation control signal is superimposed on the initial excitation control signal, and the excitation current of the elevator is adjusted by the superimposed excitation control signal to increase the excitation current.
2. The method for protecting the normal operation of an elevator according to claim 1, characterized in that, When the real-time voltage of the bus exceeds a preset voltage threshold, after adjusting the excitation current of the elevator traction machine to increase the excitation current, the method further includes: When the adjustment ratio of the excitation current exceeds a preset adjustment threshold, the adjustment of the excitation current is stopped.
3. The method for protecting the normal operation of an elevator according to claim 2, characterized in that, After stopping the adjustment of the excitation current, the method further includes: Adjust the elevator's operating speed to reduce it to a level not lower than a preset speed threshold.
4. The method for protecting the normal operation of an elevator according to claim 1, characterized in that, The step of adjusting the excitation current of the elevator by using the superimposed excitation control signal to increase the excitation current includes: The superimposed excitation control signal is transmitted to the current regulator, which adjusts the excitation current of the elevator according to the superimposed excitation control signal to increase the excitation current.
5. A device for protecting the normal operation of an elevator, characterized in that, include: The voltage monitoring module is used to monitor the real-time voltage of the elevator bus when the elevator is in automatic rescue operation in power generation mode. The judgment module is used to determine whether the real-time voltage of the bus exceeds a preset voltage threshold; The excitation control module is used to adjust the excitation current of the elevator traction machine to increase the excitation current when the real-time voltage of the bus exceeds a preset voltage threshold. The step of adjusting the excitation current of the elevator to increase the excitation current when the real-time voltage of the bus exceeds a preset voltage threshold includes: The excitation regulation control signal is superimposed on the initial excitation control signal, and the excitation current of the elevator is adjusted by the superimposed excitation control signal to increase the excitation current.
6. The device for protecting the normal operation of an elevator according to claim 5, characterized in that, Also includes: The speed correction module is used to stop adjusting the excitation current when the ratio of the adjustment to the excitation current is greater than a preset adjustment threshold, and to adjust the running speed of the elevator to reduce the running speed to no less than a preset speed threshold.
7. The device for protecting the normal operation of an elevator according to claim 5 or 6, characterized in that, The excitation control module is also used to superimpose the excitation adjustment control signal onto the initial excitation control signal, and use the superimposed excitation control signal to adjust the excitation current of the elevator to increase the excitation current.
8. An electronic device, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method for protecting the normal operation of the elevator as described in any one of claims 1 to 4.
9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for protecting the normal operation of the elevator as described in any one of claims 1 to 4.