Battery protection method, device, storage medium and product based on multi-elevator control

Abstract

The application discloses a battery protection method and device based on multi-elevator control, a storage medium and a product, relates to the technical field of batteries, and predicts a total current prediction curve of an elevator group within a preset travel time based on operation parameters of the elevator group; in the case that an overcurrent risk exists, the overcurrent direction and the first overcurrent moment of a battery pack are determined through the total current prediction curve, an overcurrent elevator set is screened out, at least one target overcurrent elevator is selected from the overcurrent elevator set according to a preset priority strategy, the energy transmission path between the target overcurrent elevator and the battery pack is cut off, the overcurrent risk is perceived in advance through total current prediction, the battery pack is prevented from suffering from an overcurrent impact from the source, the service life of the battery is significantly prolonged, the overcurrent elevator is accurately positioned in the case that the overcurrent risk exists in the battery pack, and the energy transmission path is cut off, and therefore the stability of the battery pack is significantly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery protection method, device, storage medium and product based on multi-elevator control. BACKGROUND

[0002] In a multi-elevator linkage energy recycling system, a battery pack needs to accept the regenerated electric energy generated in the operation process of multiple elevators and provide energy supply for the electric operation of the elevators. Therefore, the stable operation of the battery pack is the key foundation for ensuring the efficient circulation of energy in the multi-elevator system. Under the architecture of multiple elevators sharing the same energy storage unit, the operating states of the elevators are asynchronous and random in time. This leads to the situation that multiple elevators may be in the state of generating electricity and charging the battery at the same time, or in the state of taking electricity from the battery at the same time at a specific moment. At this time, the total current flowing to the battery is the instantaneous superposition of the branch currents, and the amplitude may be much higher than the maximum safe current that the battery can withstand.

[0003] The protection of the battery pack in the traditional scheme generally relies on the passive overcurrent protection function of the battery management system. This kind of scheme can only perform an emergency shutdown operation after the actual current is detected to be excessive by the current sensor, at which time the battery pack has already suffered an overcurrent impact. More importantly, after detecting the overcurrent, the existing scheme cannot accurately locate the elevator subject that substantially contributes to the overcurrent risk, cannot specifically cut off the energy transmission path between the elevator and the battery pack, and can only adopt a rough shutdown strategy, which cannot eliminate the overcurrent risk from the root and ultimately leads to the difficulty of long-term stable operation of the battery pack. SUMMARY

[0004] The main purpose of the present application is to provide a battery protection method, device, storage medium and product based on multi-elevator control, aiming to solve the technical problem that the traditional technology cannot accurately determine the overcurrent elevator when the battery pack has an overcurrent risk in the multi-elevator linkage energy recycling scenario.

[0005] To achieve the above-mentioned purpose, the present application provides a battery protection method based on multi-elevator control, which comprises:

[0006] predicting a total current prediction curve of the elevator group within a preset travel time based on the operating parameters of the elevator group in the operating process;

[0007] judging whether the battery pack has an overcurrent risk within the preset travel time based on the total current prediction curve and a preset safe current threshold of the battery pack;

[0008] determining the overcurrent direction and the first overcurrent moment of the battery pack through the total current prediction curve in the case that the battery pack has an overcurrent risk;

[0009] Screening a set of flow-through elevators according to the flow-through direction and the first flow-through time, selecting at least one target flow-through elevator from the set of flow-through elevators according to a preset priority strategy, and cutting off an energy transmission path between the target flow-through elevator and the battery pack.

[0010] In an embodiment, the step of predicting the total current prediction curve of the elevator group in the preset travel time based on the running parameters of the elevator group in the running process comprises:

[0011] Obtaining running parameters of the elevator group in the running process, wherein the types of the running parameters include first type parameters and second type parameters, the first type parameters include a starting floor, a target floor and a speed, and the second type parameters include an elevator load, a motion direction, an acceleration and a speed;

[0012] Predicting a charge-discharge current curve of the elevator group in the preset travel time based on the running parameters, wherein the preset travel time is a duration of a current travel of each elevator in the elevator group;

[0013] Superimposing each of the charge-discharge current curves to obtain the total current prediction curve.

[0014] In an embodiment, the step of predicting the charge-discharge current curve of the elevator group in the preset travel time based on the running parameters comprises:

[0015] In a case where the type of the running parameters is the first type parameters, calculating an acceleration section time, a constant speed section time and a deceleration section time of the elevator group in the preset travel time based on the first type parameters;

[0016] Based on historical running data of the elevator group, obtaining a historical average charge current and a historical average discharge current of the elevator group in the acceleration section time, the constant speed section time and the deceleration section time respectively when the elevator group is in a charging state and in a discharging state;

[0017] Generating the charge-discharge current curve based on the historical average charge current and the historical average discharge current.

[0018] In an embodiment, the step of predicting the charge-discharge current curve of the elevator group in the preset travel time based on the running parameters further comprises:

[0019] In a case where the type of the running parameters is the second type parameters, calculating mechanical side unbalanced forces of the acceleration section, the constant speed section and the deceleration section of the elevator group based on the second type parameters;

[0020] calculating mechanical power of the elevator group in acceleration phase, constant speed phase and deceleration phase based on the mechanical side unbalance force and the elevator running speed of the corresponding phase;

[0021] calculating fixed current values of the elevator group in acceleration phase, constant speed phase and deceleration phase based on the mechanical power, and generating the charge-discharge current curve through the fixed current values.

[0022] In an embodiment, the step of determining the overcurrent direction and the first overcurrent time of the battery pack through the total current prediction curve in the case of overcurrent risk of the battery pack comprises:

[0023] determining the overcurrent direction of the battery pack as a charging overcurrent direction in the case that the current value at any time in the total current prediction curve is greater than the charging current threshold in the preset safety current threshold;

[0024] determining the overcurrent direction of the battery pack as a discharging overcurrent direction in the case that the current value at any time in the total current prediction curve is less than the discharging current threshold in the preset safety current threshold;

[0025] extracting the time of the first determined overcurrent direction in the total current prediction curve as the first overcurrent time.

[0026] In an embodiment, the step of screening out an overcurrent elevator set through the overcurrent direction and the first overcurrent time comprises:

[0027] determining the instantaneous current direction of each elevator in the elevator group at the first overcurrent time according to the first overcurrent time;

[0028] screening out an overcurrent elevator in the elevator group, which has a matching instantaneous current direction and overcurrent direction, to obtain the overcurrent elevator set.

[0029] In an embodiment, the step of selecting at least one target overcurrent elevator from the overcurrent elevator set according to a preset priority strategy comprises:

[0030] determining the starting time when the current direction of each elevator in the overcurrent elevator set first becomes the overcurrent direction;

[0031] sorting each elevator in the overcurrent elevator set in the order from late to early according to the starting time;

[0032] selecting at least one elevator from the overcurrent elevator set as the target overcurrent elevator according to the sorting.

[0033] In addition, to achieve the above object, the present application further provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the battery protection method based on multi-elevator control.

[0034] In addition, to achieve the above object, the present application further provides a storage medium, which is a computer readable storage medium, and the storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the battery protection method based on multi-elevator control.

[0035] In addition, to achieve the above object, the present application further provides a computer program product, which comprises a computer program, and the computer program is executed by a processor to implement the steps of the battery protection method based on multi-elevator control.

[0036] The one or more technical solutions provided by the present application have at least the following technical effects:

[0037] In the embodiments of the present application, based on the running parameters of the elevator group in the running process, a total current prediction curve of the elevator group in a preset travel time is predicted; based on the total current prediction curve and a preset safety current threshold of the battery pack, it is judged whether the battery pack has an overcurrent risk in the preset travel time; in the case that the battery pack has an overcurrent risk, the overcurrent direction and the first overcurrent time of the battery pack are determined through the total current prediction curve; an overcurrent elevator set is screened out through the overcurrent direction and the first overcurrent time, at least one target overcurrent elevator is selected from the overcurrent elevator set according to a preset priority strategy, and the energy transmission path between the target overcurrent elevator and the battery pack is cut off. That is, in the embodiments of the present application, based on the running parameters of the elevator group, the total current prediction curve in the preset travel time is predicted, and the overcurrent risk is judged in combination with the preset safety current threshold of the battery pack, so that the overcurrent risk is accurately predicted in advance, and the damage risk of the battery pack due to sudden overcurrent and lack of response time is avoided. After the overcurrent risk is determined, the overcurrent direction and the first overcurrent time are determined through the total current prediction curve, so that the overcurrent risk is accurately positioned, which provides a basis for subsequent screening of overcurrent contribution elevators, and blind protection operation of the battery pack is avoided. The overcurrent elevator set is screened out through the overcurrent direction and the first overcurrent time, and the target overcurrent elevator is selected according to the preset priority strategy to cut off the energy transmission path, only the elevators that have substantial contribution to the overcurrent risk are cut off, and the elevators that participate in the overcurrent for a shorter time are cut off in priority, so that the normal operation efficiency of the elevator group is maximized while the safety of the battery pack is ensured. Finally, the overcurrent risk is eliminated from the root, and the stability of the battery pack is significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, further serve to explain the principles of the application.

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the accompanying drawings required to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, for those of ordinary skill in the art, the other drawings can also be obtained based on these drawings without any creative work.

[0040] Figure 1 A flowchart of a first embodiment of the battery protection method based on multi-elevator control of the present application;

[0041] Figure 2 A structural diagram of the battery protection system provided by the first embodiment of the present application;

[0042] Figure 3 A flowchart of screening the over-current elevator set provided by the first embodiment of the present application;

[0043] Figure 4 A flowchart of a second embodiment of the battery protection method based on multi-elevator control of the present application;

[0044] Figure 5 A device structure diagram of the hardware running environment involved in the battery protection method based on multi-elevator control in the embodiments of the present application.

[0045] The object implementation, functional features and advantages of the present application will be further explained with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0046] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application, and are not used to limit the present application.

[0047] In order to better understand the technical solutions of the present application, the following will be described in detail in combination with the drawings and specific embodiments of the specification.

[0048] The main solution of the embodiment of the application is: based on the running parameters of the elevator group in the running process, a total current prediction curve of the elevator group in a preset travel time is predicted; based on the total current prediction curve and a preset safety current threshold of the battery pack, it is judged whether the battery pack has an overcurrent risk in the preset travel time; in the case that the battery pack has an overcurrent risk, the overcurrent direction and the first overcurrent moment of the battery pack are determined through the total current prediction curve; an overcurrent elevator set is screened out through the overcurrent direction and the first overcurrent moment, at least one target overcurrent elevator is selected from the overcurrent elevator set according to a preset priority strategy, and an energy transmission path between the target overcurrent elevator and the battery pack is cut off.

[0049] In the multi-elevator linkage energy recycling system, the battery pack acts as the energy storage and output core, needs to accept the regenerated electric energy generated in the running process of multiple elevators, and at the same time provides energy supply for the electric operation of the elevators. Therefore, the stable operation of the battery pack is the key foundation to ensure the efficient energy circulation of the multi-elevator system. Under the architecture that multiple elevators share the same energy storage unit, the running states of the elevators are asynchronous and random in time. This leads to the working conditions that multiple elevators are in the state of generating electricity and charging the battery at the same time, or in the state of taking electricity from the battery at the same time at a certain moment. At this time, the total current flowing to the battery is the instantaneous superposition of the branch currents, and the amplitude may be much higher than the maximum safety current that the battery can withstand.

[0050] The traditional scheme generally relies on the passive overcurrent protection function of the battery management system to protect the battery pack. Such scheme can only perform an emergency shutdown operation after the current sensor detects that the actual current exceeds the standard, at which time the battery pack has been subjected to overcurrent impact. More importantly, after detecting the overcurrent, the existing scheme cannot accurately locate the elevator subject that substantially contributes to the overcurrent risk, cannot cut off the energy transmission path between the elevator and the battery pack, and can only adopt a rough shutdown strategy, which cannot eliminate the overcurrent risk from the root and ultimately leads to the difficulty of long-term stable operation of the battery pack.

[0051] In the embodiment of the present application, based on the running parameters of the elevator group in the running process, a total current prediction curve of the elevator group in a preset travel time is predicted; based on the total current prediction curve and a preset safety current threshold of the battery pack, it is judged whether the battery pack has an overcurrent risk in the preset travel time; in the case that the battery pack has an overcurrent risk, the overcurrent direction and the first overcurrent time of the battery pack are determined through the total current prediction curve; the overcurrent elevator set is screened out through the overcurrent direction and the first overcurrent time, at least one target overcurrent elevator is selected from the overcurrent elevator set according to a preset priority strategy, and the energy transmission path between the target overcurrent elevator and the battery pack is cut off. That is, in the embodiment of the present application, based on the running parameters of the elevator group, the total current prediction curve in the preset travel time is predicted, and the overcurrent risk is judged in combination with the preset safety current threshold of the battery pack, so that the overcurrent risk is accurately predicted in advance, and the damage risk of the battery pack due to sudden overcurrent and lack of response time is avoided. After the overcurrent risk is determined, the overcurrent direction and the first overcurrent time are determined through the total current prediction curve, so that the accurate positioning of the overcurrent risk is realized, which provides a basis for subsequent screening of overcurrent contributing elevators, and blind protection operation of the battery pack is avoided. The overcurrent elevator set is screened out through the overcurrent direction and the first overcurrent time, and the target overcurrent elevator is selected according to the preset priority strategy to cut off the energy transmission path, only the elevators that have substantial contribution to the overcurrent risk are cut off, and the elevators that participate in the overcurrent for a shorter time are cut off in priority, so that the normal operation efficiency of the elevator group is maximized while the safety of the battery pack is ensured. Finally, the overcurrent risk is eliminated from the root, and the stability of the battery pack is significantly improved.

[0052] It should be noted that the execution subject of the embodiment can be a computing service device with data processing, network communication and program running functions, such as an elevator energy recovery system, or an electronic device capable of realizing the above functions.

[0053] Based on this, the embodiment of the present application provides a battery protection method based on multi-elevator control, referring to Figure 1 , Figure 1 is a flowchart of the first embodiment of the battery protection method based on multi-elevator control of the present application.

[0054] Specifically, referring to Figure 2 , Figure 2The structural schematic diagram of the battery protection system provided in the first embodiment of the present application comprises a battery pack, a loop control unit, an elevator communication unit, a hoisting machine, an elevator control device, a power grid and a conversion device. The battery pack is used to receive regenerated electric energy generated during the operation of multiple elevators and provide energy supply for the electric operation of the elevators. The loop control unit is directly electrically connected with the battery pack and connected with the conversion device corresponding to each elevator through a line to control the on-off of the energy transmission path between each elevator and the battery pack. The elevator communication unit is communicatively connected with the control device of each elevator to obtain the operation parameters of the elevators in real time. Each elevator corresponds to an independent operation link of a set of hoisting machine, elevator control device and conversion device. The hoisting machine is a power execution component of the elevator, and its operation state directly determines the energy flow direction of the elevator. The elevator control device is used to control the operation parameters of the corresponding hoisting machine and feed back real-time operation data to the elevator communication unit. The conversion device is an energy interaction interface of the system, which realizes voltage matching and energy transmission between the DC bus of the elevator and the battery pack and the power grid. The power grid is connected with the conversion device of each elevator as a backup energy source.

[0055] In the embodiment, the battery protection method based on multi-elevator control comprises steps S10-S40.

[0056] In step S10, based on the operation parameters of the elevator group during the operation, a total current prediction curve of the elevator group within a preset travel time is predicted.

[0057] It should be noted that the operation parameters of the elevator group include two types of parameters. One type is the elevator load, motion direction, acceleration and speed, which can directly reflect the mechanical load state of the elevator operation. The other type is the starting floor, target floor and speed, which can be used to calculate the stage time of the elevator operation, and the charging and discharging current is obtained in combination with the historical operation data. The total current prediction curve is a curve obtained by algebraically superimposing the charging and discharging current curves of all elevators in the elevator group on the same time axis. The curve can intuitively reflect the trend of the total current of the elevator group within the preset travel time.

[0058] It can be understood that in the application scenario of multiple elevators, the overcurrent risk of the battery pack is caused by the superposition effect of the charging and discharging currents of multiple elevators, that is, when multiple elevators are in the charging or discharging state at the same time, the currents of each elevator are algebraically superimposed to form a total current, and if the total current exceeds the preset safety current threshold of the battery pack, the battery will be directly damaged. The traditional battery protection scheme for multiple elevators only designs an independent current control circuit for a single elevator, and does not consider the current superposition problem when the elevator group is in a synchronous operating state. For example, the charging current of a single elevator is limited to 5A, but if 5 elevators simultaneously charge the battery pack, the total current can reach 25A, which is far beyond the safety threshold of the battery pack. In addition, the traditional battery protection scheme for multiple elevators can only passively cut off energy transmission after the battery pack has an overcurrent, and cannot actively predict the charging and discharging currents of the elevator group to the battery pack, resulting in a lack of pertinence in the cutting operation, either blindly cutting off multiple elevators affecting operation, or cutting off not in time causing the battery pack to be damaged. Therefore, to solve the above difficulties, the present application obtains the real-time operating parameters of each elevator in the elevator group, independently predicts the charging and discharging current curve of each elevator, and then obtains the total current prediction curve by superposition, realizes the early prediction of the current superposition effect of the elevator group, provides a basis for subsequent accurate cutting of overcurrent elevators, and guarantees the safe operation of the battery pack.

[0059] In a feasible implementation, the step of predicting the total current prediction curve of the elevator group within a preset travel time based on the operating parameters of the elevator group during operation includes:

[0060] Obtaining operating parameters of the elevator group during operation, wherein the types of the operating parameters include first type parameters and second type parameters, the first type parameters include a starting floor, a target floor and a speed, and the second type parameters include an elevator load, a motion direction, an acceleration and a speed;

[0061] Based on the operating parameters, predicting the charging and discharging current curve of the elevator group within the preset travel time, wherein the preset travel time is the duration of the current travel of each elevator in the elevator group;

[0062] Superimposing each of the charging and discharging current curves to obtain the total current prediction curve.

[0063] It should be noted that the running parameters are obtained by communicating with the controller of each elevator through the elevator communication unit, and the communication protocol includes a wireless communication protocol, which is not limited herein. The preset travel time refers to the estimated duration of each elevator in the elevator group to complete the current single travel, for example, the full travel time of the elevator from the first floor to the tenth floor. The preset travel time can be calculated by the starting floor, target floor and speed of the elevator, or can be directly set by the user. By predicting the charging and discharging current curve of the elevator group within the preset travel time, the obtained charging and discharging current curve is matched with the actual operation cycle of the elevator, and the current superposition calculation error caused by the mismatch between the predicted time and the actual travel is avoided.

[0064] It can be understood that the application can adapt to two scenarios of deriving current based on mechanical characteristics of the elevator group and matching current based on historical data by obtaining two types of running parameters, ensuring that the charging and discharging current can be accurately predicted under different operating conditions. By predicting the charging and discharging current curve of the elevator group within the preset travel time, the time range of current prediction is matched with the actual operation cycle of the elevator, and the prediction error is reduced. Not only the accuracy and reliability of the total current prediction curve are ensured, but also the overcurrent risk misjudgment caused by incomplete parameters and mismatched prediction period is avoided, and effective data support is provided for subsequent determination of overcurrent elevators.

[0065] In a possible implementation, the step of predicting the charging and discharging current curve of the elevator group within the preset travel time based on the running parameters comprises:

[0066] In the case where the type of the running parameter is the first type of parameter, the acceleration time, the constant speed time and the deceleration time of the elevator group within the preset travel time are calculated based on the first type of parameter;

[0067] Based on the historical operation data of the elevator group, the historical average charging current and the historical average discharging current of the elevator group in the charging state and in the discharging state within the acceleration time, the constant speed time and the deceleration time are obtained respectively;

[0068] The charging and discharging current curve is generated based on the historical average charging current and the historical average discharging current.

[0069] It should be noted that the total running distance is determined by the starting floor and the target floor of the elevator, and the acceleration section time, the uniform speed section time and the deceleration section time are calculated in combination with the rated speed of the elevator and the preset acceleration, and the preset acceleration is a standard configuration parameter of the elevator. The acceleration section time is the duration of the elevator accelerating from static to rated speed, the uniform speed section time is the duration of running at rated speed, and the deceleration section time is the duration of decelerating from rated speed to static, and the sum of the three durations is the preset journey time duration. The historical running data is the running record of each elevator, including current data of each stage under different journeys and different working conditions, and the historical average discharge current and the historical average charging current corresponding to each stage are obtained after analysis. The basis for determining the charging state and the discharging state is the energy flow direction rule of the elevator during operation, that is, when the elevator is under heavy load and downward or under light load and upward, the elevator is in the power generation state, and when the elevator is under light load and downward or under heavy load and upward, the elevator is in the discharging state. Based on the running state of the elevator, in combination with the acceleration section time, the uniform speed section time and the deceleration section time, the corresponding historical average current value is matched for each running stage, and a curve composed of three constant current values in the time axis is generated, which is the charging and discharging current curve.

[0070] It can be understood that a single journey of the elevator is divided into three stages of acceleration, uniform speed and deceleration, and the duration of each stage is calculated by the running parameters such as the starting floor, the target floor and the speed. The historical average charging current and the historical average discharging current of the elevator group in each stage are obtained through the historical running data of the elevator group. Based on the stage characteristics of the elevator operation, a single journey of each elevator is divided into three running stages, the running parameters of each running stage are stable, and the current change rule can be accurately fitted by the historical average data. While ensuring the prediction accuracy, the operation load is reduced, and the real-time demand of multi-elevator collaborative control is adapted. The generated charging and discharging current curve can accurately reflect the current change characteristics of the elevator in each running stage, and provide high-quality data support for generating the total current prediction curve subsequently.

[0071] In a possible implementation, the step of predicting the charging and discharging current curve of the elevator group within the preset journey time based on the running parameters further includes:

[0072] In the case where the type of the running parameter is the second type of parameter, the mechanical side unbalanced force of the elevator group in the acceleration section, the uniform speed section and the deceleration section is calculated based on the second type of parameter;

[0073] Based on the mechanical side unbalanced force and the elevator running speed of the corresponding stage, the mechanical power of the elevator group in the acceleration section, the uniform speed section and the deceleration section is calculated;

[0074] The fixed current value of the elevator group in the acceleration section, the uniform speed section and the deceleration section is calculated based on the mechanical power, and the charging and discharging current curve is generated by the fixed current value.

[0075] It should be noted that the mechanical side unbalance force refers to the force generated on the mechanical drive side due to the difference between the total weight of the car and the counterweight during the operation of the elevator. The mechanical power refers to the energy conversion power during the operation of the elevator. The fixed current value refers to the stable current amplitude corresponding to the acceleration section, constant speed section and deceleration section of the elevator, which is calculated based on the mechanical power, system voltage and electrical efficiency. Since the acceleration and speed are stable during the operation of the elevator in the acceleration section, constant speed section and deceleration section, the corresponding fixed current values are also constant. The fixed current values of the three stages are connected in time sequence, that is, a segmented constant curve including the fixed current of the acceleration section, the fixed current of the constant speed section and the fixed current of the deceleration section is generated. The horizontal coordinate of the curve is time, which is consistent with the preset travel time, and the vertical coordinate is current value, which can reflect the charging and discharging current variation law of the elevator in the current travel.

[0076] It can be understood that the fixed current value is calculated based on the mechanical power to generate the charging and discharging current curve, which improves the accuracy of current prediction. In the case of normal operation or special working conditions of the elevator, the current can be quickly calculated based on real-time operation parameters.

[0077] For example, the car self-weight of an elevator is 1000 kg, the current load is 600 kg, the rated load is 1000 kg, and the balance coefficient is 0.45. Therefore, the counterweight weight is 1000 kg + 1000 kg x 0.45 = 1450 kg. In the case of heavy load and constant speed operation, the mechanical side unbalance force F_con≈(1600 kg-1450 kg) x 9.8 m / s²=1470 N. If the constant speed operation speed v=1.5 m / s at this time, the mechanical power P_con≈1470 N x 1.5 m / s / 1000=2.205 kW. The DC bus voltage V_system=500 V, and the comprehensive efficiency η=0.85. Therefore, the charging current prediction value I_con≈2.205 kW / (500 V x 0.85)≈5.19 A in this stage can be estimated. This value is taken as the predicted charging current of the elevator in the constant speed section, and together with the predicted values of other stages, a charging and discharging current curve of the elevator is formed.

[0078] In step S20, based on the total current prediction curve and the preset safety current threshold of the battery pack, it is judged whether there is an overcurrent risk of the battery pack within the preset travel time.

[0079] It should be noted that the preset safety current threshold includes a charging current threshold and a discharging current threshold, which are respectively used to protect the battery pack from overcharging and overdischarging current, and can be dynamically obtained by the battery management system. Each prediction point on the total current prediction curve is compared and analyzed with the corresponding safety current threshold. If the total current prediction curve exceeds the preset safety current threshold at any point, it is determined that there is an overcurrent risk. If the total current prediction curve is below the preset safety current threshold, it is determined that there is no overcurrent risk.

[0080] It can be understood that by comparing the total current prediction curve with the preset safety current threshold, potential overcurrent risks can be accurately identified before the total current reaches the over-limit value when the elevator group starts running.

[0081] Step S30, in the case that the battery pack has an overcurrent risk, determining the overcurrent direction and the first overcurrent time of the battery pack through the total current prediction curve;

[0082] It should be noted that the overcurrent direction refers to the energy transmission direction when the battery pack faces an overcurrent risk, and is divided into a charging overcurrent direction and a discharging overcurrent direction. The charging overcurrent direction refers to the total current exceeding the charging current threshold of the battery pack, at which time multiple elevators simultaneously charge the battery pack, resulting in input current overload. The discharging overcurrent direction refers to the total current exceeding the discharging current threshold of the battery pack, at which time multiple elevators simultaneously draw power from the battery pack, resulting in output current overload. The first overcurrent time refers to the time point at which the total current prediction curve first exceeds the corresponding preset safety current threshold within the preset travel time.

[0083] It can be understood that in the traditional multi-elevator battery protection scheme, even if the overcurrent risk of the battery pack can be identified, only the overcurrent risk information of the battery pack can be obtained, the energy flow direction of the current cannot be accurately determined, and the starting time of the overcurrent risk cannot be located, resulting in a lack of pertinence of the elevator cut-off operation, and the problem of affecting the operation efficiency caused by randomly cutting off multiple elevators. The application determines the overcurrent direction of the battery pack through the total current prediction curve, which divides the range boundary for subsequent screening of overcurrent elevators, and determines the first overcurrent time, which divides the time boundary for subsequent screening. Avoiding the blind, inefficient and even incorrect situation caused by inaccurate risk information in the traditional scheme, significantly improving the operation efficiency of the elevator group.

[0084] In a possible implementation, the step of determining the overcurrent direction and the first overcurrent time of the battery pack through the total current prediction curve in the case that the battery pack has an overcurrent risk includes:

[0085] In a case where a current value at any time in the total current prediction curve is greater than a charging current threshold in the preset safety current threshold, it is determined that the overcurrent direction of the battery pack is a charging overcurrent direction.

[0086] In a case where a current value at any time in the total current prediction curve is less than a discharging current threshold in the preset safety current threshold, it is determined that the overcurrent direction of the battery pack is a discharging overcurrent direction.

[0087] The time at which the overcurrent direction is first determined in the total current prediction curve is extracted as the first overcurrent time.

[0088] It should be noted that, taking the preset travel time as the time axis, the current value of the total current prediction curve is verified at each time starting from the elevator group operation starting time, and the first time that meets the condition is the first overcurrent time. If the total current prediction curve meets the overcurrent condition at multiple times, only the earliest time is extracted as the first overcurrent time. Correspondingly, the overcurrent direction and the first overcurrent time are determined correspondingly, that is, when the charging overcurrent direction is determined, the corresponding charging overcurrent first time is determined at the same time, and when the discharging overcurrent direction is determined, the corresponding discharging overcurrent first time is determined at the same time.

[0089] It can be understood that the overcurrent direction is determined by the numerical size relationship between the current value of the total current prediction curve and the preset threshold value, without introducing complex sensors or operation models, which meets the real-time demand of multi-elevator cooperative control. The first overcurrent time is determined by verifying at each time and extracting the first time that meets the condition, which can accurately lock the starting node of the overcurrent risk and cut off the energy transmission path of the overcurrent elevator in time to protect the battery pack from damage caused by overcurrent charging and discharging.

[0090] In step S40, the overcurrent elevator set is filtered out through the overcurrent direction and the first overcurrent time, at least one target overcurrent elevator is selected from the overcurrent elevator set according to a preset priority strategy, and the energy transmission path between the target overcurrent elevator and the battery pack is cut off.

[0091] It should be noted that the overcurrent elevator set refers to a set of elevators selected from the elevator group, which substantially contributes to the overcurrent risk of the battery pack. The preset priority strategy refers to a strategy preset for determining the cutting sequence of the overcurrent elevator. Cutting off the energy transmission path refers to opening the switch of the corresponding loop control unit of the elevator to disconnect the power transmission link between the direct current bus of the target overcurrent elevator and the battery pack.

[0092] It can be understood that the overcurrent elevator set is screened out from the elevator group according to the overcurrent direction and the first overcurrent time, and the target overcurrent elevator is selected from the overcurrent elevator set according to the preset priority strategy, and the elevator with the smallest influence on the elevator operation is preferentially cut off. Avoid invalid cutting operation, and ensure that the overcurrent risk can be quickly and efficiently eliminated. At the same time, in the case of ensuring the safety of the battery pack, the normal carrying capacity of the elevator group is maintained.

[0093] In a feasible implementation, referring to Figure 3 , Figure 3 The flowchart for screening the overcurrent elevator set provided by the first embodiment of the application. The step of screening the overcurrent elevator set according to the overcurrent direction and the first overcurrent time comprises steps S41-S42:

[0094] Step S41, determining the instantaneous current direction of each elevator in the elevator group at the first overcurrent time according to the first overcurrent time;

[0095] Step S42, screening the overcurrent elevator with the instantaneous current direction matching the overcurrent direction from the elevator group to obtain the overcurrent elevator set.

[0096] It should be noted that the instantaneous current direction at the first overcurrent time refers to the current direction of each elevator in the elevator group at the overcurrent time. The current value at this time is greater than zero, which is the charging direction, and the current value is less than zero, which is the discharging direction.

[0097] It can be understood that in the multi-elevator operation scene, there are elevators in charging state and discharging state in the elevator group, and the current directions of the two are opposite, and the influence on the total current is offset. If the discharging state elevator is blindly cut off, the charging overcurrent risk cannot be eliminated, and the total current will be further increased due to the current offset effect. By taking whether the instantaneous current direction matches the overcurrent direction as the basis for screening the overcurrent elevator set, the elevators with opposite overcurrent directions can be directly excluded, and invalid operation of cutting off irrelevant elevators is avoided, which significantly improves the efficiency and reliability of the battery pack overcurrent protection.

[0098] Based on the first embodiment of the application, in the second embodiment of the application, the same or similar contents as the above embodiment one can refer to the above introduction, and the following will not be repeated. On this basis, please refer to Figure 4 , Figure 4 The flowchart of the second embodiment of the battery protection method based on multi-elevator control of the application. The step of selecting at least one target overcurrent elevator from the overcurrent elevator set according to the preset priority strategy further comprises steps A41-A43:

[0099] Step A41, determining the start time when the current direction of each elevator in the overcurrent elevator set first becomes the overcurrent direction;

[0100] Step A42, for each elevator in the overcurrent elevator set, sort according to the starting time from late to early;

[0101] Step A43, according to the sorting, select at least one elevator from the overcurrent elevator set as the target overcurrent elevator.

[0102] It should be noted that the starting time when the current direction is first changed to the overcurrent direction refers to the time point when the charge and discharge current curve of each elevator in the overcurrent elevator set first meets the matching of the current direction and the overcurrent direction. The later the starting time of the elevator, the shorter the influence time of the overcurrent risk, and the smaller the influence on the overall operation of the elevator group after cutting off the elevator. The earlier the starting time of the elevator, the longer the influence time of the overcurrent risk, and the greater the influence on the overall operation of the elevator group after cutting off the elevator. After selecting and cutting off each elevator, the total current prediction curve of the remaining elevators in the overcurrent elevator set is superimposed again and the overcurrent risk is judged. If the risk is eliminated, the selection is stopped, if the risk is not eliminated, the next one is selected, until the risk is eliminated or the overcurrent elevator set is traversed.

[0103] It can be understood that the elevator with the latest starting time is preferentially cut off, which can quickly reduce the total current and eliminate the overcurrent risk after cutting off, and the degree of interference on the operation of the elevator group is the lowest due to the short time of participating in the overcurrent. Starting from the elevator with the latest starting time, the elevators are cut off in turn, and the predicted total current curve is re-evaluated after each cutting off, until the overcurrent risk is eliminated, so as to solve the overcurrent risk of the battery pack with the least number of cutting off.

[0104] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the battery protection method based on multi-elevator control of the present application. More forms of simple transformation based on this technical concept are within the protection scope of the present application.

[0105] The present application provides an electronic device, which 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 battery protection method based on multi-elevator control in the above-mentioned embodiment one.

[0106] The following refers to Figure 5The diagram illustrates a structural schematic of an electronic device suitable for implementing embodiments of this application. The electronic devices in these embodiments may include, but are not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 5 The electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0107] like Figure 5 As shown, the electronic device may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the electronic device. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. Communication device 1009 allows electronic devices to communicate wirelessly or wiredly with other devices to exchange data. While electronic devices with various systems are shown in the figures, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0108] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer readable medium, the computer program containing program codes for executing the method shown in the flowchart. In such embodiments, the computer program can be downloaded and installed from a network through a communication device, or installed from the storage device 1003, or installed from the ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiments disclosed in the present application are executed.

[0109] The electronic device provided by the present application adopts the battery protection method based on multi-elevator control in the above-mentioned embodiments, which can solve the technical problem that the traditional technology cannot accurately determine the overcurrent elevator when the battery pack appears overcurrent risk in the multi-elevator linkage energy recycling scenario. Compared with the prior art, the electronic device provided by the present application has the same beneficial effects as the battery protection method based on multi-elevator control provided by the above-mentioned embodiments, and other technical features in the electronic device are the same as the features disclosed in the previous embodiment method, which will not be repeated here.

[0110] It should be understood that various parts of the present application can be realized by hardware, software, firmware or a combination thereof. In the description of the above-mentioned embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0111] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0112] The present application provides a computer readable storage medium having stored thereon computer readable program instructions (i.e. computer program) for executing the battery protection method based on multi-elevator control in the above-mentioned embodiments.

[0113] The computer readable storage medium provided in the application may, for example, be a U disk, but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, system, or device, or any combination of the above. More specific examples of the computer readable storage medium may include, but are not limited to, an electrical connection with one or more conductive wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present embodiment, the computer readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer readable storage medium can be transmitted by any suitable medium, including but not limited to an electrical wire, an optical cable, an RF (Radio Frequency), and the like, or any suitable combination of the above.

[0114] The above computer readable storage medium may be contained in an electronic device, or may exist separately without being assembled into an electronic device.

[0115] The above computer readable storage medium carries one or more programs, which, when executed by the electronic device, cause the electronic device to: predict a total current prediction curve of an elevator group within a preset travel time based on running parameters of the elevator group during running; determine whether the battery pack has an overcurrent risk within the preset travel time based on the total current prediction curve and a preset safety current threshold of the battery pack; in the case that the battery pack has an overcurrent risk, determine an overcurrent direction and a first overcurrent time of the battery pack through the total current prediction curve; filter out an overcurrent elevator set through the overcurrent direction and the first overcurrent time, select at least one target overcurrent elevator from the overcurrent elevator set according to a preset priority strategy, and cut off an energy transmission path between the target overcurrent elevator and the battery pack.

[0116] Computer program code for carrying out operations of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0117] The flow diagrams and the block diagrams in the drawings are illustrations of architectures, functionalities, and operations of possible implementations of systems, methods, and computer program products according to various embodiments of the present application. In this regard, each block in the flow diagrams or block diagrams can represent a module, a segment, or a portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the blocks can occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently or the blocks may

[0118] The modules involved in the embodiments of the present application can be implemented in the form of software or in the form of hardware. In some cases, the name of the module does not constitute a limitation on the module itself.

[0119] The readable storage medium provided by the present application is a computer readable storage medium, which stores computer readable program instructions (i.e., a computer program) for executing the above-mentioned battery protection method based on multi-elevator control, and can solve the technical problem that the traditional technology cannot accurately determine the overcurrent elevator when the battery pack appears an overcurrent risk in the multi-elevator linkage energy recycling scenario. Compared with the prior art, the computer readable storage medium provided by the present application has the same beneficial effects as the battery protection method based on multi-elevator control provided by the above-mentioned embodiments, and will not be described here.

[0120] The application also provides a computer program product comprising a computer program which, when executed by a processor, implements the steps of the battery protection method based on multi-elevator control as described above.

[0121] The computer program product provided by the application can solve the technical problem that the traditional technology cannot accurately determine the overcurrent elevator when the battery pack has an overcurrent risk in the multi-elevator linkage energy recycling scenario. Compared with the prior art, the beneficial effects of the computer program product provided by the application are the same as those of the battery protection method based on multi-elevator control provided by the above-mentioned embodiments, and will not be repeated here.

[0122] The above only describes some embodiments of the application, and does not limit the patent scope of the application. Any equivalent structural transformation made by using the content of the specification and drawings, or direct / indirect application in other related technical fields within the technical concept of the application is included in the patent protection scope of the application.

Claims

1. A battery protection method based on multi-elevator control, characterized in that, The battery protection method based on multi-elevator control includes: Based on the operating parameters of the elevator group during operation, the total current prediction curve of the elevator group within a preset travel time is predicted. The types of operating parameters include a first type of parameter and a second type of parameter. The first type of parameter includes the number of floors and the elevator speed, and the second type of parameter includes parameters reflecting the mechanical load status of the elevator operation. Based on the total current prediction curve and the preset safe current threshold of the battery pack, it is determined whether the battery pack has an overcurrent risk within the preset travel time. If the current value at any moment in the total current prediction curve is greater than the charging current threshold in the preset safe current threshold, the overcurrent direction of the battery pack is determined to be the charging overcurrent direction. If the current value at any point in the total current prediction curve is less than the discharge current threshold in the preset safe current threshold, the overcurrent direction of the battery pack is determined to be the discharge overcurrent direction. The moment when the overcurrent direction is first determined in the total current prediction curve is taken as the first overcurrent moment; A set of overcurrent elevators is selected by filtering the overcurrent direction and the first overcurrent time. At least one target overcurrent elevator is selected from the set of overcurrent elevators according to a preset priority strategy, and the energy transmission path between the target overcurrent elevator and the battery pack is cut off.

2. The battery protection method based on multi-elevator control as described in claim 1, characterized in that, The step of predicting the total current prediction curve of the elevator group within a preset travel time based on the operating parameters of the elevator group during operation includes: Obtain the operating parameters of the elevator group during operation; Based on the operating parameters, the charging and discharging current curves of the elevator group are predicted within the preset travel time, wherein the preset travel time is the duration of the current travel of each elevator in the elevator group. The total current prediction curve is obtained by superimposing the various charge and discharge current curves.

3. The battery protection method based on multi-elevator control as described in claim 2, characterized in that, The step of predicting the charging and discharging current curve of the elevator group within the preset travel time based on the operating parameters includes: When the type of the operating parameter is a first type parameter, the acceleration period, constant speed period, and deceleration period of the elevator group within the preset travel time are calculated based on the first type parameter. Based on the historical operating data of the elevator group, the historical average charging current of the elevator group when it is in the charging state during the acceleration period, the constant speed period and the deceleration period and the historical average discharging current when it is in the discharging state are respectively obtained. The charge / discharge current curve is generated based on the historical average charging current and the historical average discharging current.

4. The battery protection method based on multi-elevator control as described in claim 2, characterized in that, The step of predicting the charging and discharging current curve of the elevator group within the preset travel time based on the operating parameters further includes: When the type of the operating parameter is the second type of parameter, the mechanical unbalance force of the elevator group in the acceleration section, constant speed section and deceleration section is calculated based on the second type of parameter; Based on the unbalanced mechanical force and the elevator running speed at the corresponding stage, the mechanical power of the elevator group in the acceleration, constant speed and deceleration stages is calculated. Based on the mechanical power, the fixed current values ​​of the elevator group in the acceleration, constant speed and deceleration sections are calculated, and the charging and discharging current curves are generated using the fixed current values.

5. The battery protection method based on multi-elevator control as described in claim 1, characterized in that, The step of selecting the set of overcurrent elevators based on the overcurrent direction and the first overcurrent time includes: The instantaneous current direction of each elevator in the elevator group at the moment of the first overcurrent is determined based on the moment of the first overcurrent. The current-carrying elevator set is obtained by selecting elevators from the elevator group whose instantaneous current direction matches the current-carrying direction.

6. The battery protection method based on multi-elevator control as described in claim 1, characterized in that, The step of selecting at least one target overcurrent elevator from the set of overcurrent elevators according to a preset priority strategy includes: Determine the starting moment when the current direction of each elevator in the overcurrent elevator set first changes to the overcurrent direction; Each elevator in the set of overcurrent elevators is sorted in order from late to early according to the start time; Based on the sorting, at least one elevator is selected from the set of flow elevators as the target flow elevator.

7. An electronic device, characterized in that, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the battery protection method based on multi-elevator control as described in any one of claims 1 to 6.

8. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the battery protection method based on multi-elevator control as described in any one of claims 1 to 6.

9. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the battery protection method based on multi-elevator control as described in any one of claims 1 to 6.

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