Method for calculating the maximum operating distance of an elevator during emergency operation during power outage

Abstract

The present invention discloses a method for calculating the maximum operable distance of an elevator during emergency operation during a power outage, comprising: step S1, establishing a lead-acid battery model; step S2, establishing a lead-acid battery load model based on the lead-acid battery model; and step S3, using the lead-acid battery load model to simulate and calculate the maximum operable distance of the elevator based on elevator parameters. The present invention can predict the maximum operable distance of an elevator during emergency operation during a power outage.

Description

Technical Field

[0001] The present invention relates to the technical field of elevators, and in particular to a method for calculating a maximum operable distance of an elevator in emergency operation during a power outage. Background Art

[0002] To enable the elevator to stop at the nearest floor or operate briefly in the event of a power outage, a backup battery is installed to power the elevator. However, due to battery capacity limitations, if the elevator is operating in conditions with large floor spacing or heavy loads that consume a lot of power, and the battery capacity is insufficient to support the operation to the nearest floor, the elevator car will not be able to evacuate passengers. Summary of the Invention

[0003] The technical problem to be solved by the present invention is how to provide a technical solution that can predict the maximum operating distance of an elevator emergency operation during a power outage, so as to provide a subsequent operation control strategy for evacuating passengers in the elevator car during a power outage.

[0004] To solve the above technical problems, the present invention provides a method for calculating the maximum operating distance of an elevator during emergency operation during a power outage, comprising:

[0005] Step S1, establishing a lead-acid battery model;

[0006] Step S2, establishing a lead-acid battery load model according to the lead-acid battery model;

[0007] Step S3, based on the elevator parameters, the maximum operable distance of the elevator is calculated by simulating the lead-acid battery load model.

[0008] Preferably, in the process of establishing the lead-acid battery model, the discharge characteristics of the lead-acid battery model are matched with the discharge characteristics of the actual battery by adjusting the battery parameters.

[0009] Preferably, the discharge characteristics are characterized by a curve of discharge voltage and discharge time under a constant discharge current.

[0010] Preferably, the method for matching the discharge characteristics of the lead-acid battery model with the discharge characteristics of the actual battery is:

[0011] Step A1, performing constant current discharge on an actual battery, and obtaining an actual discharge curve of the battery's discharge voltage versus time by monitoring the terminal voltage at both ends of the battery;

[0012] Step A2: inputting battery parameters into the lead-acid battery model to obtain a simulated discharge curve;

[0013] In step A3, the simulated discharge curve is compared with the actual discharge curve. If the matching degree reaches the preset value, the establishment of the lead-acid battery model is completed. Otherwise, the battery parameters are adjusted and the process returns to step A1.

[0014] Preferably, the lead-acid battery load model includes a plurality of lead-acid battery models connected in series.

[0015] Preferably, the input of the lead-acid battery load model includes the battery output power matrix simin_P, and the output includes the discharge current I_load, discharge voltage V_load, battery state of charge SOC, battery depth of discharge DOC, temperature T, heating power Q and the total voltage Vout of the lead-acid battery.

[0016] Preferably, the battery output power matrix simin_P is calculated by elevator parameters; the elevator parameters include the elevator's lifting height, speed, load capacity and traction machine parameters.

[0017] Preferably, in step S3, the method for calculating the maximum operable distance of the elevator is: simulating the emergency operating conditions of the elevator during a power outage through the lead-acid battery load model, and monitoring the total voltage Vout of the lead-acid battery; when the total voltage Vout of the lead-acid battery is lower than the minimum voltage value, the simulation stops; the duration of the simulation is used as the emergency operation time of the elevator, and then the maximum operable distance of the elevator emergency operation is calculated according to the preset speed of the elevator during emergency operation.

[0018] Preferably, the elevator parameters are corrected based on monitoring the total power output of the lead-acid battery during actual elevator emergency operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0020] Figure 1 This is a schematic diagram of the lead-acid battery model in Example 1;

[0021] Figure 2 Schematic diagram of the lead-acid battery load model in Example 1. DETAILED DESCRIPTION

[0022] The following describes the implementation manner of the present invention through specific specific embodiments. Those skilled in the art can fully understand other advantages and technical effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through different specific implementation manners, and the various details in this specification can also be applied based on different viewpoints, and various modifications or changes can be made without deviating from the overall design concept of the invention. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. The following exemplary embodiments of the present invention can be implemented in a variety of different forms and should not be interpreted as being limited to the specific embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art.

[0023] Example 1

[0024] This embodiment provides a method for calculating the maximum travelable distance of an elevator during emergency operation during a power outage, including:

[0025] Step S1, establishing a lead-acid battery model;

[0026] Step S2, establishing a lead-acid battery load model according to the lead-acid battery model;

[0027] Step S3, based on the elevator parameters, the maximum operable distance of the elevator is calculated by simulating the lead-acid battery load model.

[0028] Specifically, in this embodiment, the lead-acid battery model is established using MATLAB. Figure 1 As shown, SOC is the state of charge of the battery, that is, the remaining power; DOC is the depth of discharge of the battery; R0 is the internal resistance value affected by DOC; R1 is the internal resistance value affected by SOC and with thermal power; R2 is the internal resistance value affected by SOC and without thermal power; Rp is the protection resistance value affected by temperature; C1 is the capacitance value at both ends of R1 affected by DOC. The output of the model is the voltage value between the positive electrode 2 and the negative electrode 3.

[0029] In the process of building a lead-acid battery model, the battery parameters are adjusted to match the discharge characteristics of the lead-acid battery model with those of an actual battery. The model can adjust the battery parameters to observe the battery's discharge characteristics, which are characterized by a curve of discharge voltage and discharge time at a constant discharge current.

[0030] The method to match the discharge characteristics of the lead-acid battery model with the discharge characteristics of the actual battery is:

[0031] Step A1, performing constant current discharge on an actual battery, and obtaining an actual discharge curve of the battery's discharge voltage versus time by monitoring the terminal voltage at both ends of the battery;

[0032] Step A2: inputting battery parameters into the lead-acid battery model to obtain a simulated discharge curve;

[0033] In step A3, the simulated discharge curve is compared with the actual discharge curve. If the match reaches a preset value, the lead-acid battery model is established. Otherwise, the battery parameters are adjusted and the process returns to step A1. Once the simulated discharge curve and the actual discharge curve match, the battery model is considered representative of an actual lead-acid battery.

[0034] After the lead-acid battery model is established, a lead-acid battery load model is established according to the lead-acid battery model.

[0035] An exemplary lead-acid battery load model is as follows: Figure 2 As shown, the lead-acid battery model is Figure 2 BatteryCell in the equation; V_load is the discharge voltage of a single battery model; K is the number of batteries in series; Vout is the total voltage of all batteries in series, which is also one of the outputs of this model; simin_P is the input of this model and is the battery output power matrix; I_load is the battery discharge current. The input of this model is simin_P, and the outputs are I_load (discharge current), V_load (discharge voltage), SOC (battery state of charge), DOC (battery depth of discharge), T (temperature), and Q (heat generation power). simin_P is determined by the elevator's operating conditions and can be calculated based on parameters such as the elevator's hoisting height, speed, load capacity, and traction motor parameters. Analysis of the entire elevator's power outage emergency stop process shows that the elevator operates at a constant speed for the vast majority of its operation. Therefore, by calculating the battery output power during constant speed operation, the sum of the mechanical electrical power consumption and mechanical electrical losses during emergency operation can be obtained. Dividing simin_P by Vout gives the current I_load, which is the battery model's discharge current at that moment. I_load, in turn, determines the next Vout. As the simulation progresses, curves showing I_load, V_load, SOC, DOC, T, and Q over time are generated. When Vout falls below the minimum voltage, the simulation stops. The duration of the simulation is the elevator's operating time, which provides the maximum operating distance of the elevator.

[0036] To further verify the compatibility of the lead-acid battery load model with actual operating conditions, a maximum operating distance experiment was conducted on an actual elevator under the same simulation conditions. The actual elevator's mechanical and electrical power consumption and losses were monitored and compared with the theoretical simulation values. The elevator parameters used in the simulation were then modified to better match actual conditions. The resulting maximum operating distance was consistent with the actual elevator's maximum operating distance.

[0037] The above technical solution can predict the maximum operating distance of an elevator during emergency operation during a power outage. On the one hand, it is convenient to provide subsequent operation control strategies for evacuating passengers in the elevator car during a power outage. On the other hand, it is also convenient to configure a lead-acid battery with a battery capacity that matches the maximum floor distance of a building when the maximum floor distance is known.

[0038] The present invention has been described in detail above by way of specific embodiments and examples, but these do not constitute limitations of the present invention. Without departing from the principles of the present invention, those skilled in the art may make many variations and improvements, which should also be considered within the scope of protection of the present invention.

Claims

1. A method for calculating the maximum operating distance of an elevator during emergency operation during a power outage, characterized in that: include: Step S1, establishing a lead-acid battery model; Step S2, establishing a lead-acid battery load model according to the lead-acid battery model; Step S3, based on the elevator parameters, the maximum operable distance of the elevator is calculated by simulating the lead-acid battery loaded model. The method for calculating the maximum operable distance of the elevator is as follows: the emergency operation condition of the elevator during a power outage is simulated by the lead-acid battery loaded model, and the total voltage Vout of the lead-acid battery is monitored; when the total voltage Vout of the lead-acid battery is lower than the minimum voltage value, the simulation is stopped; the duration of the simulation is used as the emergency operation time of the elevator, and then the maximum operable distance of the elevator emergency operation is calculated according to the preset speed of the elevator during emergency operation.

2. The method for calculating the maximum operable distance of an elevator emergency operation during a power outage according to claim 1, characterized in that: In the process of establishing the lead-acid battery model, the battery parameters are adjusted to make the discharge characteristics of the lead-acid battery model match the discharge characteristics of the actual battery.

3. The method for calculating the maximum operable distance of an elevator during emergency operation during a power outage according to claim 2, characterized in that: The discharge characteristics are characterized by a curve of discharge voltage and discharge time at a constant discharge current.

4. The method for calculating the maximum operable distance of an elevator emergency operation during a power outage according to claim 3, characterized in that: The method to match the discharge characteristics of the lead-acid battery model with the discharge characteristics of the actual battery is: Step A1, performing constant current discharge on an actual battery, and obtaining an actual discharge curve of the battery's discharge voltage versus time by monitoring the terminal voltage at both ends of the battery; Step A2: inputting battery parameters into the lead-acid battery model to obtain a simulated discharge curve; In step A3, the simulated discharge curve is compared with the actual discharge curve. If the matching degree reaches the preset value, the establishment of the lead-acid battery model is completed. Otherwise, the battery parameters are adjusted and the process returns to step A1.

5. The method for calculating the maximum operable distance of an elevator during emergency operation during a power outage according to claim 1, characterized in that: The lead-acid battery load model includes multiple lead-acid battery models connected in series.

6. The method for calculating the maximum operable distance of an elevator emergency operation during a power outage according to claim 1, characterized in that: The input of the lead-acid battery load model includes the battery output power matrix simin_P, and the output includes the discharge current I_load, discharge voltage V_load, battery state of charge SOC, battery depth of discharge DOC, temperature T, heat power Q and the total voltage of the lead-acid battery Vout.

7. The method for calculating the maximum operable distance of an elevator emergency operation during a power outage according to claim 6, characterized in that: The battery output power matrix simin_P is calculated based on the elevator parameters; the elevator parameters include the elevator's lifting height, speed, load capacity, and traction machine parameters.

8. The method for calculating the maximum operable distance of an elevator during emergency operation during a power outage according to claim 7, characterized in that: The elevator parameters are corrected based on monitoring the total power output of the lead-acid battery during actual elevator emergency operation.

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