Method, device, electronic equipment and storage medium for protecting normal operation of an elevator

Abstract

The present application relates to the technical field of elevator, and discloses a method and device for protecting normal operation of an elevator, electronic equipment and a storage medium.The method for protecting normal operation of an elevator comprises: monitoring real-time voltage of a bus of the elevator when the elevator is automatically rescued in a power generation mode; judging whether the real-time voltage of the bus exceeds a preset voltage threshold; and adjusting a running speed of the elevator to reduce the running speed when the real-time voltage of the bus exceeds the preset voltage threshold.The method can avoid overvoltage of the bus by adjusting the running speed of the elevator when the elevator is automatically rescued in the power generation mode, and can ensure normal automatic rescue operation of the elevator while controlling the cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of elevator technology, and in particular to a method and device for protecting normal operation of an elevator, an electronic device and a storage medium. BACKGROUND

[0002] In order to avoid the occurrence of a trapped person event due to power failure during the operation of an elevator, an emergency power supply is usually provided for the elevator to provide temporary emergency power supply for the elevator control cabinet during power failure. In this way, the frequency converter of the elevator can drive the traction machine to perform “automatic rescue” (also known as “emergency rescue”) to pull the car to the nearest landing position and open the door to release the passengers.

[0003] The capacity and power of the emergency power supply are often difficult to support the traction machine to pull the car to the landing during automatic rescue operation, which may result in failure of the rescue. In this context, in an elevator applying a two-quadrant frequency converter, the elevator performs automatic rescue operation in a generation mode. This is because a braking resistor is provided in the frequency converter of the elevator, and the generated power in the generation mode can be released through the braking resistor, so as to avoid overvoltage of the bus and ensure normal automatic rescue.

[0004] However, a braking resistor is generally not configured in the control loop of a four-quadrant frequency converter, and the generated power in the automatic rescue operation in the generation mode is difficult to be released. Therefore, in an elevator applying a four-quadrant frequency converter, how to control the cost while ensuring that the elevator can normally perform automatic rescue operation has become a problem to be solved. SUMMARY

[0005] The purpose of the embodiments of the present application is to provide a method and device for protecting normal operation of an elevator, an electronic device and a storage medium, so as to ensure that the elevator applying a four-quadrant frequency converter can normally perform automatic rescue operation without increasing the cost, thereby ensuring the safety of the passengers of the elevator.

[0006] In order to achieve the above-mentioned purpose, the embodiments of the present application provide a method for protecting normal operation of an elevator, comprising: monitoring a real-time voltage of a bus of the elevator when the elevator performs automatic rescue operation in a generation mode; determining whether the real-time voltage of the bus exceeds a preset voltage threshold; and adjusting a running speed of the elevator to reduce the running speed when the real-time voltage of the bus exceeds the preset voltage threshold.

[0007] The embodiment of the present application further provides a device for protecting normal operation of an elevator, comprising: a voltage monitoring module, configured to monitor real-time voltage of a bus of the elevator when the elevator is automatically rescued in a power generation mode; a judging module, configured to judge whether the real-time voltage of the bus exceeds a preset voltage threshold; and a speed regulating module, configured to adjust a running speed of the elevator to reduce the running speed when the real-time voltage of the bus exceeds the preset voltage threshold.

[0008] The embodiment of the present application further provides an electronic device, comprising: at least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method for protecting normal operation of an elevator.

[0009] The embodiment of the present application further provides a computer readable storage medium storing a computer program, and the computer program is executed by a processor to implement the method for protecting normal operation of an elevator.

[0010] In at least one embodiment of the present application, the real-time voltage of a bus of an elevator is monitored when the elevator is automatically rescued in a power generation mode; whether the real-time voltage of the bus exceeds a preset voltage threshold is judged; and the running speed of the elevator is adjusted to reduce the running speed when the real-time voltage of the bus exceeds the preset voltage threshold. In the present application, the running speed of the elevator can be reduced when the real-time voltage of the bus exceeds the preset voltage threshold, so that the generated power during automatic rescue of the elevator can be indirectly reduced, and the generated power is adjusted to be not higher than power loss. Further, the elevator will not generate excess regenerative power when the elevator is automatically rescued in the power generation mode, so that the bus overvoltage condition is avoided, the normal operation of the automatic rescue of the elevator is ensured, and the safety of passengers of the elevator is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0011] One or more embodiments are illustrated by way of example in the figures that are part of this document, and which illustrate the principles of the embodiments. The embodiments are not limited to the examples that are described in detail in this document. Elements having the same reference numerals in the figures indicate like elements unless otherwise specifically stated. The figures in the drawings are not to scale and are provided merely for illustrating principles of the embodiments.

[0012] Figure 1 is a structural schematic diagram of an elevator automatic rescue system according to at least one embodiment of the present application;

[0013] Figure 2 is a flow schematic diagram of a method for protecting normal operation of an elevator according to at least one embodiment of the present application;

[0014] Figure 3is a flowchart of regulating the running speed of an elevator according to at least one embodiment of the present application;

[0015] Figure 4 is a structural diagram of a system for protecting normal operation of an elevator according to at least one embodiment of the present application;

[0016] Figure 5 is a structural diagram of an apparatus for protecting normal operation of an elevator according to at least one embodiment of the present application;

[0017] Figure 6 is a structural diagram of an electronic device according to at least one embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the embodiments of the present application, many technical details are presented in order to make the reader better understand the present application. However, the technical solutions claimed by the present application can be implemented even without these technical details and based on various changes and modifications of the following embodiments.

[0019] In order to better understand the present application, before introducing the technical solutions involved in the present application, the concepts involved in the present application are first explained and described:

[0020] A common frequency converter can only control the motor to work in two quadrants, so it is called a two-quadrant frequency converter.

[0021] A frequency converter capable of making the motor work in four quadrants (i.e., the four quadrants of the mechanical characteristic curve of the motor on the mathematical axis can be operated) is called a four-quadrant frequency converter.

[0022] Specifically, the four quadrants are:

[0023] First quadrant: the motor runs in forward rotation, energy flows from the frequency converter to the motor, and the speed and torque of the motor are both positive.

[0024] Second quadrant: the motor runs in reverse rotation and feedback or deceleration braking, the motor is in generator mode, energy flows from the motor to the frequency converter, the speed is negative, and the torque is positive.

[0025] Third quadrant: the motor runs in reverse rotation, energy flows from the frequency converter to the motor, and the speed and torque of the motor are both negative.

[0026] Fourth quadrant: the motor runs in forward rotation and feedback or deceleration braking, the motor is in generator mode, energy flows from the motor to the frequency converter, the speed is positive, and the torque is negative.

[0027] Nowadays, driven by the requirement of reducing cost, the capacity and power of the emergency power supply provided for the elevator is getting smaller and smaller, and cannot support the traction machine to run in the electric mode for a long time under unbalanced load. In this context, if the traction machine runs in the electric mode in the middle of the automatic rescue operation of the elevator, the emergency power supply may run out of power in the middle of the rescue, which will lead to the failure of the rescue. In this case, in the automatic rescue scenario with large unbalanced force, the generator mode is generally used for operation, that is, the elevator runs in the direction of the side where the car and the counterweight are compared to the heavier side.

[0028] In order to enable the relevant technical personnel in the art to better understand the scenario and related technical details of the automatic rescue operation of the elevator, the following will be described taking the automatic rescue system of the elevator shown in Figure 1 as an example.

[0029] Under normal circumstances of the commercial power (such as the three-phase power L1, L2, L3 shown in Figure 1 , the emergency power supply device 101 directly supplies the commercial power 380VAC to the control cabinet 102, and the frequency converter drives the elevator traction machine 106 to control the elevator car 105 to run under the power supply of the commercial power. It should be noted that, Figure 1 R, S, T shown in are the input terminals of the three-phase power, and U, V, W are the output terminals of the frequency converter.

[0030] When the power is off, the emergency power supply device 101 supplies the electrical energy stored in the battery to the control cabinet 102 through the boost inverter, and then the main board triggers the frequency converter to enter the ARD (automatic rescue device) operation mode, and the traction machine 106 drives the car 105 to stop at the nearby floor 104 under light load and the floor 103 under heavy load, so as to timely release the trapped passengers.

[0031] In the entire elevator system, on the one hand, there are motor losses and mechanical losses, and on the other hand, there are standby losses and working losses of the frequency converter. During the automatic rescue operation of the elevator in the generator mode, when the generator power is greater than the sum of the above loss power, the electrical energy will gradually accumulate on the bus capacitor, and at this time the bus voltage will gradually increase with time.

[0032] Figure 1When the automatic rescue is performed in the power generation mode, the generated electric energy can be released through the braking resistor, so that the bus overvoltage can be avoided. When the bus overvoltage occurs, components such as IGBT (Insulated Gate Bipolar Transistor) of the frequency converter can be damaged. Therefore, in the elevator applying the two-quadrant frequency converter, the automatic rescue operation in the power generation mode can avoid the bus overvoltage, and ensure the normal operation of the elevator automatic rescue.

[0033] However, in the elevator applying the four-quadrant frequency converter, the braking resistor for preventing the bus overvoltage is generally not configured in the control loop, and the elevator frequency converter switches to the power supply through the emergency power supply when the power fails. At this time, the regenerative electric energy generated when the automatic rescue is performed in the power generation mode cannot be released and cannot be fed back to the power grid. Therefore, there is a problem that the bus overvoltage cannot be prevented during the automatic rescue operation of the elevator.

[0034] For the elevator applying the four-quadrant frequency converter, there are two methods for preventing the bus overvoltage during the automatic rescue operation in the related art. One method is to increase the power capacity of the emergency power supply in the elevator, and to make the elevator operate in the motoring mode rather than the power generation mode during the automatic rescue operation, so that the regenerative electric energy can be avoided, and the bus voltage rise can be prevented. Another method is to additionally configure a discharge resistor (for example, the discharge resistor 1011 shown in FIG. 1) in the emergency power supply or the four-quadrant frequency converter, and to make the elevator operate in the power generation mode during the automatic rescue operation. In this way, when the bus voltage rises, the regenerative electric energy can be released through the discharge resistor, so that the bus overvoltage can be avoided. Figure 1

[0035] However, the above two methods for solving the problem of bus overvoltage increase the cost, which is contrary to the requirement of enterprises to control the cost. Therefore, an embodiment of the present application proposes a new automatic rescue operation control method, which can realize the automatic rescue operation of the four-quadrant frequency converter without increasing the power of the emergency power supply and the discharge resistor.

[0036] At least one embodiment of the present application provides a method for protecting the normal operation of an elevator to solve the problem of bus overvoltage that can occur during the automatic rescue operation of the elevator applying the four-quadrant frequency converter, while controlling the cost. The method for protecting the normal operation of the elevator can be applied to an elevator control cabinet, an elevator frequency converter, or a chip thereof. In the embodiment, first, the real-time voltage of the bus of the elevator is monitored when the elevator is automatically rescued in the power generation mode; it is determined whether the real-time voltage of the bus exceeds a preset voltage threshold; and when the real-time voltage of the bus exceeds the preset voltage threshold, the operating speed of the elevator is adjusted to reduce the operating speed.

[0037] ​The implementation details of the method for protecting normal operation of the elevator according to the embodiment will be described in detail below. The following description is only for the convenience of understanding the implementation details of the present solution and is not mandatory for implementing the present solution. The specific flow is as shown in Figure 2 The method can include the following steps:

[0038] Step 201: When the elevator is automatically rescued in the power generation mode, the real-time voltage of the bus of the elevator is monitored.

[0039] Step 202: It is determined whether the real-time voltage of the bus exceeds a preset voltage threshold.

[0040] Step 203: When the real-time voltage of the bus exceeds the preset voltage threshold, the running speed of the elevator is adjusted to reduce the running speed.

[0041] It can be understood that the method for protecting normal operation of the elevator provided by the present embodiment is applicable to the application scenario that the elevator is automatically rescued in the power generation mode. In step 201, the real-time voltage of the bus of the elevator is monitored in this scenario.

[0042] In step 202, it is determined whether the real-time voltage of the bus exceeds a preset voltage threshold. It should be noted that the preset voltage threshold involved in the present step is pre-set, which can be determined according to the rated voltage of the bus of the frequency converter.

[0043] In step 203, when the real-time voltage of the bus exceeds the preset voltage threshold, the running speed of the elevator is reduced, which can indirectly reduce the generated power during the automatic rescue of the elevator and adjust the generated power to be not higher than the power loss.

[0044] It should be noted that in step 203, when the reduction of the running speed of the elevator causes the real-time voltage of the bus to be lower than the preset voltage threshold, the running speed can be continuously adjusted. At this time, the adjustment can include upward and downward adjustment of the running speed within a small range. As long as the real-time voltage of the bus is within the safe voltage range at the running speed, it is acceptable.

[0045] In some embodiments, a preset speed threshold can also be set for the real-time running speed of the elevator. In these embodiments, after the step 203 of adjusting the running speed of the elevator to reduce the running speed when the real-time voltage of the bus exceeds the preset voltage threshold, the method can further include: stopping adjusting the running speed when the real-time running speed of the elevator is less than the preset speed threshold.

[0046] If the elevator runs too slowly in the automatic rescue operation, the time required to pull the car to the landing will be lengthened, and the time for the passengers trapped in the car will also be lengthened accordingly, which will have a serious negative impact on the experience of the passengers riding the elevator. In the present embodiment, the real-time running speed of the elevator is controlled to be not less than the preset speed threshold, which can avoid the time for the passengers trapped in the elevator to be rescued being too long, and help to improve the experience of the passengers in the elevator in the case of power failure.

[0047] In some embodiments, after the running speed is adjusted, the excitation current to the busbar can be further increased so that the real-time voltage of the busbar does not exceed the preset voltage threshold. In the present embodiment, the running speed of the elevator is limited to be adjusted to the preset speed threshold to avoid the time for the trapped personnel in the elevator to be rescued being too long. If the running speed is adjusted to the preset speed threshold and the busbar voltage still cannot recover to the normal range (i.e. below the preset voltage threshold), the real-time voltage of the busbar can be further adjusted by increasing the excitation current.

[0048] It should be noted that when the excitation current is increased, the power loss of the motor will also increase accordingly, so that the power generation is indirectly limited to be not greater than the total power loss by increasing the excitation current, thereby avoiding the overvoltage of the busbar. Thus, in addition to adjusting the running speed of the elevator, the normal automatic rescue operation of the elevator is further guaranteed, and the safety of the trapped passengers in the elevator is further ensured.

[0049] In some embodiments, the step of adjusting the running speed of the elevator to be reduced when the real-time voltage of the busbar exceeds the preset voltage threshold can further include the following steps, and the flowchart can be referred to Figure 3 :

[0050] Step 301, determining the speed adjustment control signal according to the real-time voltage of the busbar and the preset voltage threshold;

[0051] Step 302, superimposing the speed adjustment control signal to the initial speed control signal, and adjusting the running speed of the elevator to be reduced by using the speed control signal obtained by superimposition.

[0052] In step 301, based on the real-time voltage of the busbar and the preset voltage threshold, how to adjust the speed of the elevator is determined, and then the speed adjustment control signal is output.

[0053] In step 302, the speed adjustment control signal can be understood as a correction signal for the running speed of the elevator, and the result of superimposing the initial speed control signal can adjust the running speed of the elevator to the ideal speed (i.e. the running speed corresponding to the real-time voltage of the busbar not exceeding the preset voltage threshold).

[0054] In some embodiments, step 301, determining the speed regulation control signal based on the real-time voltage of the bus and the preset voltage threshold, may include: performing PID closed-loop control based on the real-time voltage of the bus and the preset voltage threshold to obtain the speed regulation signal. In this embodiment, performing PID (Proportion Integration Differentiation) closed-loop control on the real-time voltage of the bus and the preset voltage threshold can conveniently and quickly determine which speed regulation control signal should be output, i.e., how to regulate the elevator's running speed.

[0055] In some embodiments, step 302, which involves adjusting the elevator's operating speed using the superimposed speed control signal to reduce the operating speed, may further include: transmitting the superimposed speed control signal to a speed regulator, so that the speed regulator adjusts the elevator's operating speed according to the superimposed speed control signal to reduce the operating speed.

[0056] 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 4 The speed correction module 401 shown determines the speed regulation control signal based on the real-time voltage VdcFbk and the preset voltage threshold VdcLtd. This speed regulation control signal, combined with the initial speed control signal SpdRef, is used to control the speed regulator 402 (ASR, Automatic Speed ​​Regulator). The speed regulator transmits its output signal to the current regulator 404 (ACR, Automatic Current Regulator), which then outputs a signal to the pulse width modulation 405 (PWM, Pulse Width Modulation), and finally outputs a signal to the traction machine 406. This adjusts the speed at which the traction machine drives the car and ultimately pulls the car to the landing. It should be noted that if the elevator's real-time operating speed is adjusted to below the preset speed threshold but the real-time voltage of the busbar still fails to reach the normal range, the excitation current can be increased to further regulate the real-time voltage of the busbar. In this case, an excitation correction module 403 can be added to the system to adjust the elevator's excitation current.

[0057] 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:

[0058] The elevator travels between two floors when lightly loaded (see example). Figure 1If 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.

[0059] 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.

[0060] like Figure 4 The speed correction module 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 speed command SpdRef of ARD operation to correct the actual operating speed during ARD operation and indirectly regulate the power generation during ARD operation, so that the power generation is not greater than the total power loss, thereby controlling the bus voltage below the preset voltage threshold VdcLtd or maintaining the bus voltage near the threshold value without rising.

[0061] To avoid prolonged passenger confinement due to excessively low elevator speeds, the elevator speed is not adjusted downwards once it reaches a speed threshold. If the bus voltage is still below the safe range (i.e., less than the preset voltage threshold), the excitation correction module can output an excitation correction amount, which is then added to the initial excitation current value IdRef and transmitted to the current regulator. In a more specific example, the excitation current can be increased from 0% to 30%. By increasing motor power loss, the goal of ensuring that the generated power does not exceed the total power loss is achieved, thereby regulating the bus voltage below the preset voltage threshold VdcLtd or maintaining the bus voltage near that threshold without further increase.

[0062] 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.

[0063] In the embodiment, when the elevator is automatically rescued in the power generation mode, the real-time voltage of the bus of the elevator is monitored; it is judged 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 running speed of the elevator is adjusted to reduce the running speed. In the application, when the real-time voltage of the bus exceeds the preset voltage threshold, the running speed of the elevator can be reduced, so that the generated power during the automatic rescue of the elevator can be indirectly reduced, and the generated power is adjusted to be not higher than the power loss. Further, when the elevator is automatically rescued in the power generation mode, no extra regenerative power is generated, so that the overvoltage of the bus is avoided, the normal operation of the automatic rescue of the elevator is ensured, and the safety of the passengers of the elevator is ensured.

[0064] An embodiment of the application relates to a device for protecting normal operation of an elevator, as shown in the figure, comprising: Figure 5

[0065] The voltage monitoring module 501 is used for monitoring the real-time voltage of the bus of the elevator when the elevator is automatically rescued in the power generation mode.

[0066] The judging module 502 is used for judging whether the real-time voltage of the bus exceeds a preset voltage threshold.

[0067] The speed control module 503 is used for adjusting the running speed of the elevator to reduce the running speed when the real-time voltage of the bus exceeds the preset voltage threshold.

[0068] In some embodiments, the device for protecting normal operation of the elevator can further comprise an excitation correction module, which is used for stopping adjusting the running speed and increasing the excitation current to the real-time voltage of the bus not exceeding the preset voltage threshold when the real-time running speed of the elevator is less than a preset speed threshold.

[0069] In some embodiments, the speed control module 503 can be further used for determining a speed adjustment control signal according to the real-time voltage of the bus and the preset voltage threshold; superimposing the speed adjustment control signal to an initial speed control signal, and adjusting the running speed of the elevator to reduce the running speed by using the superimposed speed control signal.

[0070] In some embodiments, the speed control module 503 can be further used for performing PID closed-loop control based on the real-time voltage of the bus and the preset voltage threshold to obtain the speed adjustment signal.

[0071] ​In some embodiments, the speed control module 503 can also be used to transmit the superimposed speed control signal to the speed regulator, so that the speed regulator can adjust the running speed of the elevator according to the superimposed speed control signal to reduce the running speed.

[0072] 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; and adjusts the elevator's operating speed to reduce the speed when the real-time voltage of the busbar exceeds the preset voltage threshold. In this application, the elevator's operating speed can be reduced when the real-time voltage of the busbar exceeds the preset voltage threshold, thereby indirectly reducing the power generation generated during automatic rescue operation and adjusting the power generation to no higher than the power loss. Consequently, no excess regenerative energy is generated during automatic rescue operation in generator mode, thus avoiding busbar overvoltage, ensuring the normal operation of the elevator's automatic rescue, and protecting the safety of elevator passengers.

[0073] 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.

[0074] Embodiments of the present invention also provide an electronic device, such as... Figure 6 As shown, it includes at least one processor 601; and a memory 602 communicatively connected to the at least one processor 601; wherein the memory 602 stores instructions that can be executed by the at least one processor 601, the instructions being executed by the at least one processor 601 to enable the at least one processor 601 to perform the above-described method for protecting the normal operation of the elevator.

[0075] The memory 602 and the processor 601 are connected in a bus manner, the bus can include any number of interconnected buses and bridges, the bus connects one or more processors 601 and various circuits of the memory 602 together. The bus can also connect various other circuits such as peripheral devices, voltage stabilizers and power management circuits together, which are well known in the art, therefore, further description is not made herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be one element or multiple elements such as multiple receivers and transmitters, which provide units for communicating with various other devices on the transmission medium. The data processed by the processor 601 is transmitted on the wireless medium through the antenna, further, the antenna also receives data and transmits the data to the processor 601.

[0076] The processor 601 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interface, voltage regulation, power management and other control functions. The memory 602 can be used to store data used by the processor 601 in performing operations.

[0077] The product described above can execute the method provided by the embodiments of the application, has the corresponding function modules and beneficial effects of executing the method, and the technical details not described in detail in the embodiments can be referred to the method provided by the embodiments of the application.

[0078] The embodiments of the application also provide a computer readable storage medium storing a computer program. The computer program is executed by the processor to implement the method for protecting normal operation of the elevator.

[0079] Those skilled in the art can understand that all or part of the steps of the above-mentioned embodiment methods can be completed by programs instructing related hardware, the programs are stored in a storage medium, and include a plurality of instructions for causing a device (which can be a single-chip microcomputer, a chip, etc.) or a processor to execute all or part of the steps of the method described in various embodiments of the application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk and various program code storage media.

[0080] The above-mentioned embodiments are provided to those skilled in the art to implement and use the application, those skilled in the art can make various modifications or changes to the above-mentioned embodiments without departing from the inventive concept of the application, therefore, the protection scope of the application is not limited by the above-mentioned embodiments, but should conform to the maximum range of the innovative features mentioned in the claims.

Claims

1. A method of protecting normal operation of an elevator, characterized by The method comprises: monitoring the real-time voltage of a bus of the elevator when the elevator is automatically rescued and operated in the power generation mode; judging whether the real-time voltage of the bus exceeds a preset voltage threshold; adjusting the operating speed of the elevator to reduce the operating speed to reduce the power generation of the elevator to not higher than the power loss generated by the elevator when the real-time voltage of the bus exceeds the preset voltage threshold.

2. The method of protecting elevator normal operation according to claim 1, characterized in that, After the operating speed of the elevator is adjusted to reduce the operating speed when the real-time voltage of the bus exceeds the preset voltage threshold, the method further comprises: stopping adjusting the operating speed when the real-time operating speed of the elevator is less than a preset speed threshold.

3. The method of protecting elevator normal operation according to claim 2, characterized in that, After the operating speed is stopped, the method further comprises: increasing the excitation current until the real-time voltage of the bus does not exceed the preset voltage threshold.

4. The method of protecting elevator normal operation according to any one of claims 1 to 3, characterized by, The adjusting the operating speed of the elevator to reduce the operating speed when the real-time voltage of the bus exceeds the preset voltage threshold comprises: determining a speed adjustment control signal according to the real-time voltage of the bus and the preset voltage threshold; superimposing the speed adjustment control signal on an initial speed control signal, and adjusting the operating speed of the elevator to reduce the operating speed by using the speed control signal obtained by superimposition.

5. The method of protecting elevator normal operation according to claim 4, characterized in that, The determining the speed adjustment control signal according to the real-time voltage of the bus and the preset voltage threshold comprises: performing PID closed-loop control based on the real-time voltage of the bus and the preset voltage threshold to obtain the speed adjustment signal.

6. The method of protecting elevator normal operation according to claim 4, characterized in that, The adjusting the operating speed of the elevator to reduce the operating speed by using the speed control signal obtained by superimposition comprises: transmitting the speed control signal obtained by superimposition to a speed regulator, so that the speed regulator adjusts the operating speed of the elevator to reduce the operating speed according to the speed control signal obtained by superimposition.

7. An apparatus for protecting normal operation of an elevator, characterized by The method comprises: a voltage monitoring module configured to monitor the real-time voltage of a bus of the elevator when the elevator is automatically rescued and operated in the power generation mode; a judging module configured to judge whether the real-time voltage of the bus exceeds a preset voltage threshold; a speed control module configured to adjust the operating speed of the elevator to reduce the operating speed to reduce the power generation of the elevator to not higher than the power loss generated by the elevator when the real-time voltage of the bus exceeds the preset voltage threshold.

8. An arrangement for protecting normal operation of an elevator according to claim 7, characterized in that The method further comprises: an excitation correction module configured to stop adjusting the operating speed when the real-time operating speed of the elevator is less than a preset speed threshold, and increase the excitation current until the real-time voltage of the bus does not exceed the preset voltage threshold.

9. An electronic device, comprising: The method comprises: at least one processor; and a memory connected in communication with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method for protecting normal operation of an elevator according to any one of claims 1 to 6.

10. A computer readable storage medium storing a computer program, characterized in that, The computer program is executed by the processor to implement the method for protecting normal operation of an elevator according to any one of claims 1 to 6.

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