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

Abstract

The invention discloses a battery protection method and device based on multi-elevator control, a storage medium and a product, and relates to the technical field of batteries. Based on operation parameters of an elevator group, a total current prediction curve of the elevator group within preset travel time is predicted; under the condition that an overcurrent risk exists, the overcurrent direction and the first-time overcurrent moment of the 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, an energy transmission path between the target overcurrent elevator and the battery pack is cut off, and the battery pack is started. The over-current risk is sensed in advance through total current prejudgment, the battery pack is prevented from being impacted by over-current from the source, the service life of the battery is remarkably prolonged, the over-current elevator is accurately positioned under the condition that the over-current risk exists in the battery pack, an energy transmission path is cut off, and the stability of the battery pack is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery protection method, device, storage medium and product based on multi-elevator control. Background Technology

[0002] In a multi-elevator interconnected energy recycling system, the battery pack, as the core of energy storage and output, needs to handle the regenerated electrical energy generated during the operation of multiple elevators, while also providing energy replenishment for the elevators' electric operation. Therefore, the stable operation of the battery pack is a crucial foundation for ensuring the efficient energy cycle of the multi-elevator system. In an architecture where multiple elevators share the same energy storage unit, the operating states of each elevator are asynchronous and random in time. This leads to situations where, at a specific moment, multiple elevators may simultaneously be generating electricity and charging the battery, or simultaneously drawing power from the battery while in electric mode. In such cases, the total current flowing to the battery is the instantaneous algebraic sum of the currents in each branch, and its amplitude may far exceed the maximum safe current that the battery can withstand.

[0003] Traditional solutions for battery pack protection generally rely on the passive overcurrent protection function of the battery management system. These solutions can only perform an emergency shutdown operation after the current sensor detects an excessive current, by which time the battery pack has already suffered an overcurrent surge. More importantly, existing solutions, after detecting an overcurrent, cannot accurately pinpoint the elevator components that substantially contribute to the overcurrent risk, nor can they specifically cut off the energy transmission path between that part of the elevator and the battery pack. They can only adopt a coarse shutdown strategy, failing to eliminate the overcurrent risk at its source, ultimately leading to difficulties in the long-term stable operation of the battery pack. Summary of the Invention

[0004] The main purpose of this application is to provide a battery protection method, device, storage medium and product based on multi-elevator control, which aims to solve the technical problem that traditional technology cannot accurately identify the overcurrent elevator when the battery pack is at risk of overcurrent in the scenario of energy reuse through multi-elevator linkage.

[0005] To achieve the above objectives, this application proposes a battery protection method based on multi-elevator control, the battery protection method based on multi-elevator control comprising: 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. 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. In the event of an overcurrent risk in the battery pack, the overcurrent direction and the moment of the first overcurrent are determined using the total current prediction curve. 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.

[0006] In one embodiment, 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: The operating parameters of the elevator group during operation are obtained, wherein the types of operating parameters include a first type of parameter and a second type of parameter. The first type of parameter includes the starting floor, the target floor, and the elevator speed, and the second type of parameter includes the elevator load, the direction of movement, the acceleration, and the elevator speed. 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.

[0007] In one embodiment, 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.

[0008] In one embodiment, 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 operating 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.

[0009] In one embodiment, the step of determining the overcurrent direction and the first overcurrent moment of the battery pack using the total current prediction curve when the battery pack is at risk of overcurrent includes: 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 extracted as the first overcurrent moment.

[0010] In one embodiment, 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.

[0011] In one embodiment, the step of selecting at least one target overcurrent elevator from the overcurrent elevator set 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 overflow 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.

[0012] In addition, to achieve the above objectives, this application also proposes an electronic device, the device comprising: 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 above.

[0013] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and 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 above.

[0014] In addition, to achieve the above objectives, this application also provides a computer program product, which 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 above.

[0015] One or more technical solutions proposed in this application have at least the following technical effects: In this embodiment, based on the operating parameters of the elevator group during operation, a total current prediction curve for the elevator group within a preset travel time is predicted. 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 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 selected based on the overcurrent direction and the first overcurrent time, and at least one target overcurrent elevator is selected from the overcurrent elevator set according to a preset priority strategy, cutting off the energy transmission path between the target overcurrent elevator and the battery pack. In other words, this embodiment predicts the total current prediction curve within a preset travel time based on the operating parameters of the elevator group, and combines this with the preset safe current threshold of the battery pack to determine the overcurrent risk, achieving accurate pre-judgment of the overcurrent risk and avoiding the risk of damage to the battery pack due to insufficient response time caused by sudden overcurrent. After determining the overcurrent risk, the overcurrent direction and the first overcurrent time are determined through the total current prediction curve, achieving accurate positioning of the overcurrent risk and providing a basis for subsequent selection of overcurrent contributing elevators, avoiding blind protection operations on the battery pack. By filtering the set of elevators affected by overcurrent based on the direction and timing of the first overcurrent event, and selecting target elevators to cut off energy transmission paths according to a preset priority strategy, only elevators that substantially contribute to the overcurrent risk are cut off, with priority given to elevators with shorter overcurrent durations. This approach maximizes the normal operating efficiency of the elevator group while ensuring battery pack safety. Ultimately, overcurrent risk is eliminated at its source, significantly improving the stability of the battery pack. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating the first embodiment of the battery protection method based on multi-elevator control in this application; Figure 2 This is a schematic diagram of the battery protection system provided in the first embodiment of this application; Figure 3 A schematic diagram of the process for filtering the set of overcurrent elevators provided in the first embodiment of this application; Figure 4 This is a flowchart illustrating the second embodiment of the battery protection method based on multi-elevator control in this application; Figure 5 This is a schematic diagram of the equipment structure of the hardware operating environment involved in the battery protection method based on multi-elevator control in the embodiments of this application.

[0019] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0021] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0022] The main solution of this application embodiment is as follows: based on the operating parameters of the elevator group during operation, predict the total current prediction curve of the elevator group within a preset travel time; based on the total current prediction curve and the preset safe current threshold of the battery pack, determine whether the battery pack has an overcurrent risk within the preset travel time; if the battery pack has an overcurrent risk, determine the overcurrent direction and the 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, and select at least one target overcurrent elevator from the overcurrent elevator set according to a preset priority strategy, and cut off the energy transmission path between the target overcurrent elevator and the battery pack.

[0023] In a multi-elevator interconnected energy recycling system, the battery pack, as the core of energy storage and output, needs to handle the regenerated electrical energy generated during the operation of multiple elevators, while also providing energy replenishment for the elevators' electric operation. Therefore, the stable operation of the battery pack is a crucial foundation for ensuring the efficient energy cycle of the multi-elevator system. In an architecture where multiple elevators share the same energy storage unit, the operating states of each elevator are asynchronous and random in time. This leads to situations where, at a specific moment, multiple elevators may simultaneously be generating electricity and charging the battery, or simultaneously drawing power from the battery while in electric mode. In such cases, the total current flowing to the battery is the instantaneous algebraic sum of the currents in each branch, and its amplitude may far exceed the maximum safe current that the battery can withstand.

[0024] Traditional solutions for battery pack protection generally rely on the passive overcurrent protection function of the battery management system. These solutions can only perform an emergency shutdown operation after the current sensor detects an excessive current, by which time the battery pack has already suffered an overcurrent surge. More importantly, existing solutions, after detecting an overcurrent, cannot accurately pinpoint the elevator components that substantially contribute to the overcurrent risk, nor can they specifically cut off the energy transmission path between that part of the elevator and the battery pack. They can only adopt a coarse shutdown strategy, failing to eliminate the overcurrent risk at its source, ultimately leading to difficulties in the long-term stable operation of the battery pack.

[0025] In this embodiment, based on the operating parameters of the elevator group during operation, a total current prediction curve for the elevator group within a preset travel time is predicted. 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 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 selected based on the overcurrent direction and the first overcurrent time, and at least one target overcurrent elevator is selected from the overcurrent elevator set according to a preset priority strategy, cutting off the energy transmission path between the target overcurrent elevator and the battery pack. In other words, this embodiment predicts the total current prediction curve within a preset travel time based on the operating parameters of the elevator group, and combines this with the preset safe current threshold of the battery pack to determine the overcurrent risk, achieving accurate pre-judgment of the overcurrent risk and avoiding the risk of damage to the battery pack due to insufficient response time caused by sudden overcurrent. After determining the overcurrent risk, the overcurrent direction and the first overcurrent time are determined through the total current prediction curve, achieving accurate positioning of the overcurrent risk and providing a basis for subsequent selection of overcurrent contributing elevators, avoiding blind protection operations on the battery pack. By filtering the set of elevators affected by overcurrent based on the direction and timing of the first overcurrent event, and selecting target elevators to cut off energy transmission paths according to a preset priority strategy, only elevators that substantially contribute to the overcurrent risk are cut off, with priority given to elevators with shorter overcurrent durations. This approach maximizes the normal operating efficiency of the elevator group while ensuring battery pack safety. Ultimately, overcurrent risk is eliminated at its source, significantly improving the stability of the battery pack.

[0026] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication and program execution functions, such as an elevator energy recovery system, or an electronic device capable of realizing the above functions.

[0027] Based on this, the embodiments of this application provide a battery protection method based on multi-elevator control, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the battery protection method based on multi-elevator control in this application.

[0028] Specifically, refer to Figure 2 , Figure 2 This is a schematic diagram of the battery protection system provided in the first embodiment of this application. The battery protection system includes a battery pack, a circuit control unit, an elevator communication unit, a traction machine, an elevator control device, a power grid, and a conversion device. The battery pack is used to receive regenerative electrical energy generated during the operation of multiple elevators and to provide energy replenishment for the electric operation of the elevators. The circuit control unit is directly electrically connected to the battery pack and is also connected to the corresponding conversion device of each elevator via a line, controlling the on / off state of the energy transmission path between each elevator and the battery pack. The elevator communication unit establishes a communication connection with the control device of each elevator to obtain the operating parameters of each elevator in real time. Each elevator corresponds to an independent operating link of a traction machine, elevator control device, and conversion device. The traction machine is the power execution component of the elevator, and its operating state directly determines the energy flow direction of the elevator. The elevator control device is used to control the operating parameters of the corresponding traction machine and to feed back real-time operating data to the elevator communication unit. The conversion device is the energy interaction interface of the system, realizing voltage matching and energy transmission between the elevator DC bus, the battery pack, and the power grid. The power grid is connected to the conversion device of each elevator as a backup energy source.

[0029] In this embodiment, the battery protection method based on multi-elevator control includes steps S10~S40: Step S10: Based on the operating parameters of the elevator group during operation, predict the total current prediction curve of the elevator group within a preset travel time. It should be noted that the operating parameters of the elevator group include two categories. One category includes elevator load, direction of movement, acceleration, and speed, which directly reflect the mechanical load state of the elevator operation. The other category includes starting floor, target floor, and speed, which can be used to calculate the stage time of elevator operation and, combined with historical operating data, obtain the charging and discharging current. The total current prediction curve is obtained by algebraically superimposing the charging and discharging current curves of all elevators in the elevator group along the same time axis. This curve can intuitively reflect the changing trend of the total current of the elevator group within the preset travel time.

[0030] Understandably, in multi-elevator applications, the overcurrent risk to the battery pack stems from the cumulative effect of the charging and discharging currents of multiple elevators. When multiple elevators are simultaneously charging or discharging, the current from each elevator algebraically adds up to a total current. If this total current exceeds the battery pack's preset safe current threshold, it will directly damage the battery. Traditional multi-elevator battery protection schemes only design independent current control circuits for individual elevators, failing to consider the current superposition problem when the elevator group operates synchronously. For example, limiting the charging current of a single elevator to 5A might result in a total current of 25A when five elevators are charging the battery pack simultaneously, far exceeding the battery pack's safe threshold. Furthermore, traditional multi-elevator battery protection schemes can only passively cut off energy transmission after an overcurrent occurs in the battery pack, unable to proactively predict the charging and discharging current of the elevator group. This leads to a lack of targeted cutoff operations, either blindly cutting off multiple elevators and affecting operation, or failing to cut off in time, resulting in battery pack damage. Therefore, to solve the above-mentioned dilemma, this application obtains the real-time operating parameters of each elevator in the elevator group, first independently predicts the charging and discharging current curve of each elevator, and then obtains the total current prediction curve by superposition, so as to realize the advance prediction of the current superposition effect of the elevator group, providing a basis for accurately cutting off the overcurrent elevator in the future and ensuring the safe operation of the battery pack.

[0031] In one 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: The operating parameters of the elevator group during operation are obtained, wherein the types of operating parameters include a first type of parameter and a second type of parameter. The first type of parameter includes the starting floor, the target floor, and the elevator speed, and the second type of parameter includes the elevator load, the direction of movement, the acceleration, and the elevator speed. 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.

[0032] It should be noted that operating parameters are obtained by communicating with the controller of each elevator through the elevator communication unit. The communication protocol includes wireless communication protocols, which are not limited here. The preset travel time refers to the estimated duration for each elevator in the elevator group to complete its current single trip, such as the total time for an elevator to travel from the 1st floor to the 10th floor. The preset travel time can be calculated from the elevator's starting floor, target floor, and speed, or it can be set directly by the user. By predicting the charging and discharging current curve of the elevator group within the preset travel time, the system ensures that the obtained charging and discharging current curve matches the actual operating cycle of the elevators, avoiding current superposition calculation errors caused by discrepancies between the predicted time and the actual travel time.

[0033] Understandably, this application, by acquiring two types of operating parameters, can adapt to two scenarios: inferring current based on the mechanical characteristics of elevator groups and matching current based on historical data, ensuring accurate prediction of charging and discharging current under different operating conditions. By predicting the charging and discharging current curves of the elevator group within a preset travel time, the time range of current prediction is matched with the actual operating cycle of the elevators, reducing prediction errors. This not only ensures the accuracy and reliability of the total current prediction curve and avoids misjudgment of overcurrent risk due to incomplete parameters or mismatched prediction cycles, but also provides effective data support for subsequent identification of elevators with overcurrent.

[0034] In one feasible implementation, 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.

[0035] It should be noted that the total travel distance is determined by the elevator's starting and target floors. The acceleration, constant speed, and deceleration times are calculated by combining this with the elevator's rated speed and preset acceleration. The preset acceleration is a standard configuration parameter for the elevator. The acceleration time is the duration for the elevator to accelerate from a standstill to its rated speed; the constant speed time is the duration for operation at the rated speed; and the deceleration time is the duration for deceleration from the rated speed to a standstill. The sum of these three durations is the preset travel time. Historical operating data consists of the operating records for each elevator, including current data for each stage under different travel distances and operating conditions. Analysis yields the historical average discharge current and historical average charging current for each stage. The charging and discharging states are determined based on the energy flow pattern during elevator operation: under heavy load (descending) or light load (ascending), the elevator is in a power generation state; under light load (descending) or heavy load (ascending), the elevator is in a discharging state. Based on the elevator's operating status, and combining the acceleration period, constant speed period, and deceleration period, a corresponding historical average current value is matched for each operating stage, generating a curve on the time axis composed of three constant current values. This curve is the charging and discharging current curve.

[0036] Understandably, the elevator's single trip is divided into three stages: acceleration, constant speed, and deceleration. The duration of each stage is calculated using operating parameters such as the starting floor, target floor, and elevator speed. Historical average charging and discharging currents for the elevator group in each stage are obtained from historical operating data. Based on the stage-specific characteristics of elevator operation, each elevator's single trip is divided into three operating stages. The operating parameters for each stage are stable, and the current variation pattern can be accurately fitted using historical average data. This approach reduces computational load while maintaining prediction accuracy, adapting to the real-time requirements of multi-elevator collaborative control. The generated charging and discharging current curves accurately reflect the current variation characteristics of the elevator in each operating stage, providing high-quality data support for the subsequent generation of the total current prediction curve.

[0037] In one feasible implementation, 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 operating 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.

[0038] It should be noted that the mechanical unbalanced force refers to the force generated on the mechanical transmission side by the difference between the total weight of the car and the weight of the counterweight during elevator operation. Mechanical power refers to the energy conversion power during elevator operation. The fixed current value refers to the stable current amplitude corresponding to the acceleration, constant speed, and deceleration phases of the elevator, calculated from the mechanical power, system voltage, and electrical efficiency. Since the acceleration and speed of the elevator remain stable during the acceleration, constant speed, and deceleration phases, the corresponding fixed current values ​​are also constant. By connecting the fixed current values ​​of the three phases in chronological order, a piecewise constant curve is generated, including the fixed current of the acceleration, constant speed, and deceleration phases. The horizontal axis of this curve represents time, consistent with the preset travel time, and the vertical axis represents the current value, reflecting the charging and discharging current variation pattern of the elevator within the current travel range.

[0039] Understandably, calculating a fixed current value using mechanical power and generating a charging / discharging current curve improves the accuracy of current prediction. Whether the elevator is in normal operation or under special conditions, the current can be quickly calculated using real-time operating parameters.

[0040] For example, if an elevator car has a self-weight of 1000kg, a current load of 600kg, a rated load of 1000kg, and a balance coefficient of 0.45, then the counterweight weight is 1000kg + 1000kg × 0.45 = 1450kg. During the heavy-load descent and constant-speed operation phase, the mechanical unbalance force F_con ≈ (1600kg - 1450kg) × 9.8 m / s² = 1470N. If the constant-speed operation at this time is v = 1.5m / s, then the mechanical power P_con ≈ 1470N × 1.5m / s / 1000 = 2.205kW. With a DC bus voltage V_system = 500V and a comprehensive efficiency η = 0.85, the predicted charging current for this phase can be estimated as I_con ≈ 2.205kW / (500V × 0.85) ≈ 5.19A. This value is used as the predicted charging current of the elevator in the constant speed range, and together with the predicted values ​​of other stages, it forms the charging and discharging current curve of the elevator.

[0041] Step S20: Based on the total current prediction curve and the preset safe current threshold of the battery pack, determine whether there is an overcurrent risk in the battery pack within the preset travel time. It should be noted that the preset safe current threshold includes a charging current threshold and a discharging current threshold, which are used to protect the battery pack from damage caused by overcharging and over-discharging currents, respectively. These thresholds can be dynamically obtained through the battery management system. Each predicted point on the total current prediction curve is compared and analyzed with the corresponding safe current threshold. If the total current prediction curve exceeds the preset safe current threshold at any point, an overcurrent risk is identified; if the total current prediction curve remains below the preset safe current threshold, no overcurrent risk is identified.

[0042] Understandably, by comparing the total current prediction curve with the preset safe current threshold, potential overcurrent risks can be accurately identified before the total current reaches the limit value when the elevator group starts operating.

[0043] Step S30: In the event of an overcurrent risk in the battery pack, the overcurrent direction and the moment of the first overcurrent are determined by the total current prediction curve. It should be noted that overcurrent direction refers to the energy transfer direction when the battery pack faces overcurrent risk, and is divided into charging overcurrent direction and discharging overcurrent direction. Charging overcurrent direction occurs when the total current exceeds the battery pack's charging current threshold, causing multiple elevators to simultaneously charge the battery pack, resulting in input current overload. Discharging overcurrent direction occurs when the total current exceeds the battery pack's discharging current threshold, causing multiple elevators to simultaneously draw power from the battery pack, resulting in output current overload. The first overcurrent moment refers to the point in time within the preset travel time when the total current prediction curve first exceeds the corresponding preset safe current threshold.

[0044] Understandably, traditional multi-elevator battery protection schemes, even if they can identify an overcurrent risk in the battery pack, can only obtain the risk information that the battery pack current exceeds the limit. They cannot accurately determine the energy flow direction of the current, let alone pinpoint the onset time of the overcurrent risk. This results in a lack of targeted elevator shutdown operations, leading to the random shutdown of multiple elevators and impacting operational efficiency. This application determines the overcurrent direction of the battery pack through a total current prediction curve, defining the scope boundary for subsequent screening of elevators with overcurrent. By determining the initial overcurrent moment, it defines the time boundary for subsequent screening. This avoids the blind, inefficient, or even erroneous shutdown operations caused by inaccurate risk information in traditional schemes, significantly improving the operational efficiency of the elevator group.

[0045] In one feasible implementation, the step of determining the overcurrent direction and the first overcurrent moment of the battery pack using the total current prediction curve when the battery pack is at risk of overcurrent includes: 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 extracted as the first overcurrent moment.

[0046] It should be noted that, using the preset travel time as the time axis, starting from the initial moment of elevator group operation, the current value of the total current prediction curve is checked moment by moment to see if it meets the judgment condition for the corresponding overcurrent direction. The first moment that meets the condition is the initial overcurrent moment. If the total current prediction curve meets the overcurrent condition at multiple moments, only the earliest moment is extracted as the initial overcurrent moment. Accordingly, the overcurrent direction and the initial overcurrent moment must be determined accordingly. That is, when it is determined to be a charging overcurrent direction, the corresponding initial charging overcurrent moment is determined simultaneously; when it is determined to be a discharging overcurrent direction, the corresponding initial discharging overcurrent moment is determined simultaneously.

[0047] Understandably, determining the overcurrent direction by comparing the current value of the total current prediction curve with a preset threshold eliminates the need for complex sensors or computational models, thus meeting the real-time requirements of multi-elevator collaborative control. By verifying and extracting the first time the conditions are met to determine the initial overcurrent moment, the starting point of the overcurrent risk can be accurately pinpointed, allowing for timely interruption of the energy transmission path of the overcurrent elevator and protecting the battery pack from damage caused by overcurrent charging and discharging.

[0048] Step S40: Select a set of overcurrent elevators based on the overcurrent direction and the first overcurrent time; select at least one target overcurrent elevator from the set of overcurrent elevators according to a preset priority strategy; and cut off the energy transmission path between the target overcurrent elevator and the battery pack.

[0049] It should be noted that the overcurrent elevator set refers to the set of elevators selected from the elevator group that substantially contribute to the overcurrent risk of the battery pack. The preset priority strategy refers to a pre-set strategy used to determine the disconnection order of the overcurrent elevators. Disconnecting the energy transmission path means breaking the power transmission link between the DC bus of the target overcurrent elevator and the battery pack by opening the switch of the control unit corresponding to the elevator's circuit.

[0050] Understandably, by selecting a set of elevators subject to overcurrent from the elevator group based on the direction of overcurrent and the moment of the first overcurrent, and then selecting a target overcurrent elevator from this set according to a preset priority strategy, prioritizing the disconnection of elevators with the least impact on elevator operation. This avoids ineffective disconnection operations and ensures that overcurrent risks can be eliminated quickly and efficiently. At the same time, while ensuring the safety of the battery pack, the normal operating capacity of the elevator group is maintained.

[0051] In one feasible implementation, see Figure 3 , Figure 3 This is a schematic flowchart illustrating the process of filtering a set of overcurrent elevators according to the first embodiment of this application. The step of filtering the set of overcurrent elevators based on the overcurrent direction and the first overcurrent time includes steps S41 to S42: Step S41: Determine the instantaneous current direction of each elevator in the elevator group at the time of the first overcurrent, based on the time of the first overcurrent. Step S42: Select the overcurrent elevators from the elevator group whose instantaneous current direction matches the overcurrent direction to obtain the overcurrent elevator set.

[0052] It should be noted that the instantaneous current direction at the moment of the first overcurrent refers to the current direction of each elevator in the elevator group at the moment of the overcurrent. If the current value at this moment is greater than zero, it is the charging direction; if the current value is less than zero, it is the discharging direction.

[0053] Understandably, in multi-elevator operation scenarios, elevators in both charging and discharging states may exist simultaneously within a group. Since their current directions are opposite, their impact on the total current cancels each other out. Blindly disconnecting discharging elevators not only fails to eliminate the risk of overcurrent during charging but also weakens the current cancellation effect, leading to a further increase in the total current. By using the match between the instantaneous current direction and the overcurrent direction as the criterion for filtering overcurrent elevators, elevators with opposite overcurrent directions can be directly excluded, avoiding the ineffective operation of disconnecting irrelevant elevators and significantly improving the efficiency and reliability of battery pack overcurrent protection.

[0054] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 4 , Figure 4 This is a flowchart illustrating the second embodiment of the battery protection method based on multi-elevator control in this application. The step of selecting at least one target overcurrent elevator from the overcurrent elevator set according to a preset priority strategy further includes steps A41-A43: Step A41: Determine the starting time when the current direction of each elevator in the overcurrent elevator set first changes to the overcurrent direction; Step A42: Sort each elevator in the set of overflow elevators in order from late to early according to the start time; Step A43: Based on the sorting, select at least one elevator from the set of overflow elevators as the target overflow elevator.

[0055] It should be noted that the starting moment when the current direction first changes to the overcurrent direction refers to the point at which the charging and discharging current curves of each elevator in the overcurrent elevator set first meet the matching requirement between the current direction and the overcurrent direction. The later the starting moment, the shorter the impact time on the overcurrent risk, and the smaller the impact on the overall operation of the elevator group after disconnecting that elevator. Conversely, the earlier the starting moment, the longer the impact time on the overcurrent risk, and the greater the impact on the overall operation of the elevator group after disconnecting that elevator. After each elevator is selected and disconnected, the total current prediction curve of the remaining elevators in the overcurrent elevator set needs to be re-overlaid and the overcurrent risk assessed. If the risk is eliminated, selection stops; if the risk is not eliminated, the next elevator is selected, until the risk is eliminated or the entire overcurrent elevator set is traversed.

[0056] Understandably, prioritizing the disconnection of elevators with later start times is advantageous. This approach quickly reduces the total current and eliminates overcurrent risk, while minimizing disruption to the elevator group's operation due to the shorter duration of overcurrent involvement. The process involves sequentially disconnecting elevators starting with the one with the latest start time, reassessing the predicted total current curve after each disconnection, until the overcurrent risk is eliminated. This minimizes the number of disconnections required to mitigate the battery pack's overcurrent risk.

[0057] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the battery protection method based on multi-elevator control in this application. Any simple modifications based on this technical concept are within the scope of protection of this application.

[0058] This application provides an electronic device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the battery protection method based on multi-elevator control in Embodiment 1 above.

[0059] The following is for reference. Figure 5 The 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.

[0060] 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.

[0061] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0062] The electronic device provided in this application employs the battery protection method based on multi-elevator control described in the above embodiments. This solves the technical problem in scenarios involving the reuse of energy through multi-elevator linkages where traditional technologies cannot accurately identify the elevator experiencing overcurrent when the battery pack faces overcurrent risk. Compared to existing technologies, the beneficial effects of the electronic device provided in this application are the same as those of the battery protection method based on multi-elevator control provided in the above embodiments. Furthermore, other technical features of this electronic device are the same as those disclosed in the previous embodiment, and will not be repeated here.

[0063] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0064] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0065] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the battery protection method based on multi-elevator control in the above embodiments.

[0066] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this 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 may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0067] The aforementioned computer-readable storage medium may be included in an electronic device or may exist independently without being assembled into an electronic device.

[0068] The aforementioned computer-readable storage medium carries one or more programs. When the aforementioned one or more programs are executed by an electronic device, the electronic device causes the following: based on the operating parameters of the elevator group during operation, to predict the total current prediction curve of the elevator group within a preset travel time; based on the total current prediction curve and a preset safe current threshold of the battery pack, to determine whether the battery pack has an overcurrent risk within the preset travel time; if the battery pack has an overcurrent risk, to determine the overcurrent direction and the first overcurrent time of the battery pack through the total current prediction curve; to filter out an overcurrent elevator set through the overcurrent direction and the first overcurrent time, and to select at least one target overcurrent elevator from the overcurrent elevator set according to a preset priority strategy, and to cut off the energy transmission path between the target overcurrent elevator and the battery pack.

[0069] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0070] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0071] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0072] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the aforementioned battery protection method based on multi-elevator control. This solves the technical problem in multi-elevator linkage energy reuse scenarios where traditional technologies cannot accurately identify the elevator experiencing overcurrent when the battery pack faces overcurrent risk. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the battery protection method based on multi-elevator control provided in the above embodiments, and will not be repeated here.

[0073] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the battery protection method based on multi-elevator control as described above.

[0074] The computer program product provided in this application can solve the technical problem that traditional technologies cannot accurately identify the elevator experiencing overcurrent when there is an overcurrent risk in the battery pack, in scenarios involving the reuse of energy through multi-elevator linkages. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the battery protection method based on multi-elevator control provided in the above embodiments, and will not be repeated here.

[0075] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this 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. 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. In the event of an overcurrent risk in the battery pack, the overcurrent direction and the moment of the first overcurrent are determined using the total current prediction curve. 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: The operating parameters of the elevator group during operation are obtained, wherein the types of operating parameters include a first type of parameter and a second type of parameter. The first type of parameter includes the starting floor, the target floor, and the elevator speed, and the second type of parameter includes the elevator load, the direction of movement, the acceleration, and the elevator speed. 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 operating 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 determining the overcurrent direction and the first overcurrent moment of the battery pack using the total current prediction curve when the battery pack is at risk of overcurrent includes: If the current value at any point 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 extracted as the first overcurrent moment.

6. 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.

7. 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 overflow 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.

8. 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 7.

9. 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 7.

10. 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 7.

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