Energy storage and elevator collaborative risk prevention and control system and method
By designing a risk prevention and control system that integrates energy storage and elevators, the system monitors grid parameters in real time and dynamically adjusts the operating mode, thus solving the problem of passive elevator shutdown caused by grid fluctuations and achieving production continuity and efficient energy utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HEFEI HUASI SYST CO LTD
- Filing Date
- 2026-03-06
- Publication Date
- 2026-06-26
Smart Images
Figure CN122276552A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of elevator technology, and in particular to a collaborative risk prevention and control system and method for energy storage and elevators. Background Technology
[0002] In factory production scenarios, the start-up and shutdown of high-power equipment often causes a sudden drop (e.g., <340V) or a sudden rise (e.g., >420V) in grid voltage. When the voltage drops suddenly, the energy storage device's charging is interrupted, causing the operating elevator to trigger undervoltage protection and shut down due to insufficient energy supply, resulting in personnel being stranded and production interruptions. When the voltage rises suddenly, the energy storage device's overvoltage protection is activated, and the regenerative energy generated by the elevator's braking cannot be recovered, not only causing energy waste but also affecting braking performance due to the interruption of the energy recovery channel, thus posing operational risks.
[0003] Existing passive response solutions mostly employ protective actions such as equipment shutdown, and then reconnect after the voltage is restored. This has obvious drawbacks: on the one hand, passive shutdown leads to a decrease in production efficiency; on the other hand, the lack of clear threshold definitions and dynamic power matching strategies makes it impossible to achieve coordinated control of energy storage and elevators under fluctuating operating conditions, resulting in low energy utilization efficiency and difficulty in adapting to complex and ever-changing factory power environments. Summary of the Invention
[0004] The main objective of this invention is to provide a collaborative risk prevention and control system and method for energy storage and elevators, aiming to solve the technical defects of elevators being passively shut down due to energy interruption or overvoltage protection caused by sudden drops (<340V) or rises (>420V) in grid voltage, resulting in waste of regenerative energy. Existing passive response schemes have problems such as vague strategies and inability to achieve dynamic power matching between energy storage and elevators under fluctuating operating conditions, leading to production interruptions.
[0005] To achieve the above objectives, this invention proposes a collaborative risk prevention and control system for energy storage and elevators, comprising: a power grid parameter monitoring module, an elevator control module, an energy storage execution module, and a collaborative control module; The power grid parameter monitoring module is used to collect the electrical parameters of the power grid in real time, and output the electrical parameters after filtering and analog-to-digital conversion; among them, the electrical parameters include voltage U and frequency f; The elevator control module is used to control the operation of the elevator and provide real-time feedback on the elevator's operating status, including ascending, descending / braking, and standby. The energy storage execution module is used to control the charging and discharging mode, power output and current regulation of the energy storage device, and to provide real-time feedback on the status of the energy storage system to the collaborative control module, including the state of charge (SOC). The collaborative control module communicates with the power grid parameter monitoring module, the elevator control module, and the energy storage execution module respectively. The collaborative control module has a built-in voltage threshold range, frequency threshold range, and matching strategy database. It compares the real-time voltage U and frequency f data with the built-in voltage threshold range and frequency threshold range to identify the current power grid operating conditions. The collaborative control module is also used to receive real-time voltage U and frequency f data from the power grid parameter monitoring module, receive the elevator operating status from the elevator control module, and receive the energy storage device status from the energy storage execution module. Based on the identified power grid conditions and the received elevator operating status, it calls the corresponding collaborative matching strategy from the matching strategy database, generates and sends energy storage control commands to the energy storage execution module, and sends elevator control commands to the elevator control module. The energy storage execution module dynamically adjusts the charging and discharging mode, power, and current of the energy storage device based on the received energy storage control commands; The elevator control module dynamically adjusts the elevator's operating power and / or operating speed based on the received elevator control commands.
[0006] Furthermore, the voltage threshold range includes: the normal operating reference range of the elevator, the voltage drop trigger threshold U0, and the voltage rise trigger threshold U1, wherein U0 is lower than the lower limit of the reference range and U1 is higher than the upper limit of the reference range; the frequency threshold range includes the frequency anomaly thresholds f0 and f1.
[0007] Furthermore, collaborative matching strategies include: Normal operating conditions of the power grid: When the voltage U and frequency f data are within the reference range and the frequency threshold range, respectively, the energy storage control command controls the energy storage device to operate in the charging recovery mode, charging with the first charging current range and maintaining the SOC in the first SOC range; when the elevator is in the braking stage, it recovers regenerative energy with the first regenerative energy recovery ratio; the elevator control command controls the elevator to operate within the rated operating power range. Voltage sag strategy: When U is lower than U0, the energy storage control command controls the energy storage device to switch to discharge replenishment mode; Voltage surge strategy: When U is higher than U1, the energy storage control command controls the energy storage device to start the energy diversion mode or internal circulation mode. Frequency abnormal operation strategy: When f is lower than f0 or higher than f1, the collaborative control module refers to the voltage drop operation strategy or voltage rise operation strategy respectively, triggering the energy storage device to enter the pre-discharge mode or start the energy diversion channel. Recovery Strategy: When U and f approach the normal range and the stabilization time reaches the preset time, the energy storage control command controls the energy storage device to gradually switch back to the charging recovery mode, and transfers the temporarily stored energy to the energy storage device with the preset transfer power. The elevator control module gradually restores the rated operating power and speed of the elevator.
[0008] Furthermore, voltage sag control strategies include: When the elevator is in the ascending phase, the energy storage control command controls the energy storage device to compensate with a first discharge power P_dis, where P_dis = P_ele - P_grid, P_ele is the power demanded by the elevator, and P_grid is the actual power supplied by the grid; and when the SOC drops to the second SOC threshold, the discharge power is reduced, and the elevator is simultaneously commanded to reduce its operating speed to the first speed threshold. When the elevator is in the descent or braking phase, the energy storage control command controls the energy storage device to stop charging the grid and use the regenerated energy P_regen to replenish its own SOC. When the elevator is in standby mode, the energy storage control command controls the energy storage device to suspend charging and activates the internal voltage regulation circuit to maintain SOC stability.
[0009] Furthermore, voltage scaling strategies include: When the elevator is in the braking regeneration stage, the energy storage control command controls the energy storage device to suspend the charging of the lithium battery pack and switch to the energy shunt mode. The regenerated energy P_regen is temporarily stored in the supercapacitor through a dedicated channel and shunted with the first shunt current I_shunt. When the supercapacitor SOC reaches the third SOC threshold, the current limiting protection is activated, and the elevator is instructed to reduce the braking intensity. When the elevator is in the ascending or running phase, the energy storage control command controls the energy storage device to suspend its connection with the grid, maintaining only the internal energy circulation channel between the energy storage and the elevator; and according to the energy storage SOC level, it provides the elevator with full or proportional power supply, and synchronously commands the elevator to adjust its operating speed. When the elevator is in standby mode, the energy storage control command controls the energy storage device to disconnect from the power grid and maintain the internal low power consumption cycle.
[0010] Furthermore, the normal operating reference range of the elevator is voltage U∈[342V, 418V], frequency f∈[49.5Hz, 50.5Hz]; voltage drop trigger threshold U0 is 340V; voltage rise trigger threshold U1 is 420V; frequency abnormal threshold f0 is 49.5Hz, f1 is 50.5Hz.
[0011] Furthermore, in the voltage drop operation strategy, when U is lower than U0 and the elevator is in the rising stage, the energy storage control command controls the energy storage device to compensate with discharge power P_dis=P_ele-P_grid, and when SOC drops to 20%, the discharge power is reduced and the elevator is instructed to reduce its operating speed to 70%~80% of the rated speed.
[0012] Furthermore, in the voltage surge operation strategy, when U is higher than U1 and the elevator is in the braking regeneration stage, the energy storage control command controls the energy storage device to temporarily store the regenerated energy P_regen in the supercapacitor, and the shunt current I_shunt = P_regen / U_cap, where U_cap is the rated voltage of the supercapacitor; and when the supercapacitor SOC reaches 90%, I_shunt is reduced to 50% of the rated shunt current, and at the same time, the elevator is instructed to reduce the braking power to 70%~85% of the rated braking power.
[0013] Furthermore, the energy storage device includes one or more combinations of lithium batteries, sodium batteries, and supercapacitors; the elevator system includes one or more of elevators, escalators, robotic arms, and cranes.
[0014] This invention also proposes a method for risk prevention and control through the coordinated use of energy storage and elevators, comprising the following steps: S10, the voltage U and frequency f of the power grid are collected in real time through the power grid parameter monitoring module; S20 receives voltage U and frequency f data through the collaborative control module, as well as the elevator operation status from the elevator control module and the energy storage device status from the energy storage execution module. S30, the cooperative control module compares the received voltage U and frequency f data with the built-in voltage threshold range and frequency threshold range to identify the current power grid operating condition; S40, the collaborative control module, based on the identified power grid conditions and elevator operating status, calls the corresponding collaborative matching strategy from the built-in matching strategy database, generates energy storage control commands and elevator control commands, and performs control according to the control commands.
[0015] This invention transforms the passive shutdown response to grid fluctuations into proactive energy dispatch. Through a defined U / f threshold, a matching strategy covering all operating conditions, and quantifiable execution parameters, it enables seamless collaborative operation of energy storage devices and elevators under grid fluctuations, maximizing the utilization efficiency of renewable energy while ensuring production continuity. Attached Figure Description
[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.
[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 schematic diagram of the modular structure of the energy storage and elevator collaborative risk prevention and control system according to an embodiment of the present invention; Figure 2 This is a flowchart illustrating the risk prevention and control method for the coordinated use of energy storage and elevators according to the present invention. Figure 3 This is a state transition logic diagram for a risk control system that integrates energy storage and elevators.
[0019] The objectives, features, and advantages of this invention 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 the present invention and are not intended to limit the present invention.
[0021] To better understand the technical solution of the present invention, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments.
[0022] The technical solution of the present invention will be described in detail below with reference to specific application scenarios. This embodiment takes a 22kW rated power elevator and a 100kWh rated capacity lithium battery energy storage device (including a 200F / 400V supercapacitor auxiliary energy storage unit) in a factory as an example to describe how the system responds to grid fluctuations and achieves coordinated risk prevention and control during a typical working day.
[0023] To clearly illustrate the technical solution of this invention, the parameters in this embodiment are preset as follows: the normal operating reference range of the elevator is voltage U∈[342V, 418V] and frequency f∈[49.5Hz, 50.5Hz]; the voltage drop trigger threshold U0 is set to 340V, and the voltage rise trigger threshold U1 is set to 420V; the frequency abnormality threshold f0 is set to 49.5Hz, and f1 is set to 50.5Hz; the recovery stabilization time is preset to 3 seconds. The first SOC range is set to 30% to 80%; the second SOC threshold (power reduction protection point) is set to 20%; and the third SOC threshold (supercapacitor current limiting point) is set to 90%. The normal charging current is set to 0.3C~0.5C, corresponding to a current value of 30A~50A; the regenerative energy recovery ratio is preset to 90%; the rated operating power of the elevator is 22kW, the rated shunt current is preset to 140A based on the maximum shunt capacity of the supercapacitor, and the rated current IN of the elevator traction motor corresponds to 22kW power, which is approximately 35A in this embodiment.
[0024] To clearly describe the technical solution of this invention, the meanings of the main symbols appearing in the text are defined as follows: U: Real-time grid voltage; f: Real-time grid frequency; U0: Voltage sag trigger threshold, set to 340V in this embodiment; U1: Voltage surge trigger threshold, set to 420V in this embodiment; f0: Low frequency abnormal threshold, set to 49.5Hz in this embodiment; f1: High frequency abnormal threshold, set to 50.5Hz in this embodiment; SOC: State of charge of energy storage device, ranging from 0% to 100%; k0: Lower limit of the first SOC interval, set to 30% in this embodiment; k1: Upper limit of the first SOC interval, set to 80% in this embodiment; P_ele: Real-time power demand of the elevator; P_grid: Real-time power supplied by the grid; P_regen: Regenerative power generated when the elevator brakes; P_dis: Discharge power of the energy storage device; I _dis: Discharge current of the energy storage device; U_bat: Rated voltage of the energy storage battery, which is 640V for the lithium battery pack in this embodiment; U_cap: Rated voltage of the supercapacitor, which is 400V in this embodiment; I_shunt: Shunt current in energy shunt mode; PN: Rated power of the elevator, which is 22kW in this embodiment; IN: Rated current of the elevator traction motor, which is approximately 35A for 22kW in this embodiment; C: Rated capacity of the energy storage battery, which is the current reference corresponding to 100kWh in this embodiment; I_stab: Stabilizing current in standby mode; I_brake: Braking current of the elevator; P_sup: Power supplied from the energy storage to the elevator under voltage surge conditions; P_transfer: Power transferred from the temporarily stored energy under recovery conditions.
[0025] like Figure 1 As shown, Figure 1This is a schematic diagram of the modular structure of the energy storage and elevator collaborative risk prevention and control system according to an embodiment of the present invention; Reference Figure 1 This invention proposes a collaborative risk prevention and control system for energy storage and elevators, comprising: a power grid parameter monitoring module 10, an elevator control module 20, an energy storage execution module 30, and a collaborative control module 40; The power grid parameter monitoring module 10 is used to collect the electrical parameters of the power grid in real time, and output the electrical parameters after filtering and analog-to-digital conversion; among them, the electrical parameters include voltage U and frequency f; The elevator control module 20 is used to control the operation of the elevator and provide real-time feedback on the operating status of the elevator, including ascending, descending / braking and standby. The energy storage execution module 30 is used to control the charging and discharging mode, power output and current regulation of the energy storage device, and to provide real-time feedback of the energy storage system status to the collaborative control module 40, including the state of charge (SOC). The collaborative control module 40 is communicatively connected to the power grid parameter monitoring module 10, the elevator control module 20, and the energy storage execution module 30, respectively. The collaborative control module 40 has a built-in voltage threshold range, frequency threshold range, and matching strategy database, and compares the real-time voltage U and frequency f data with the built-in voltage threshold range and frequency threshold range to identify the current power grid operating conditions. The collaborative control module 40 is also used to receive real-time voltage U and frequency f data from the power grid parameter monitoring module 10, receive the elevator operating status from the elevator control module 20, and receive the energy storage device status from the energy storage execution module 30. Based on the identified power grid conditions and the received elevator operating status, it calls the corresponding collaborative matching strategy from the matching strategy database, generates and sends energy storage control commands to the energy storage execution module 30, and sends elevator control commands to the elevator control module 20. The energy storage execution module 30 dynamically adjusts the charging and discharging mode, power, and current of the energy storage device according to the received energy storage control commands; The elevator control module 20 dynamically adjusts the operating power and / or operating speed of the elevator according to the received elevator control commands.
[0026] Furthermore, the voltage threshold range includes: the normal operating reference range of the elevator, the voltage drop trigger threshold U0, and the voltage rise trigger threshold U1, wherein U0 is lower than the lower limit of the reference range and U1 is higher than the upper limit of the reference range; the frequency threshold range includes the frequency anomaly thresholds f0 and f1.
[0027] Furthermore, collaborative matching strategies include: Normal operating conditions of the power grid: When the voltage U and frequency f data are within the reference range and the frequency threshold range, respectively, the energy storage control command controls the energy storage device to operate in the charging recovery mode, charging with the first charging current range and maintaining the SOC in the first SOC range; when the elevator is in the braking stage, it recovers regenerative energy with the first regenerative energy recovery ratio; the elevator control command controls the elevator to operate within the rated operating power range. Voltage sag strategy: When U is lower than U0, the energy storage control command controls the energy storage device to switch to discharge replenishment mode; Voltage surge strategy: When U is higher than U1, the energy storage control command controls the energy storage device to start the energy diversion mode or internal circulation mode. Frequency abnormal operation strategy: When f is lower than f0 or higher than f1, the cooperative control module 40 refers to the voltage drop operation strategy or the voltage rise operation strategy respectively, and triggers the energy storage device to enter the pre-discharge mode or start the energy diversion channel. Recovery Strategy: When U and f approach the normal range and the stabilization time reaches the preset time, the energy storage control command controls the energy storage device to gradually switch back to the charging recovery mode, and transfers the temporarily stored energy to the energy storage device with the preset transfer power. The elevator control module 20 gradually restores the rated operating power and speed of the elevator.
[0028] Furthermore, voltage sag control strategies include: When the elevator is in the ascending phase, the energy storage control command controls the energy storage device to compensate with a first discharge power P_dis, where P_dis = P_ele - P_grid, P_ele is the power demanded by the elevator, and P_grid is the actual power supplied by the grid; and when the SOC drops to the second SOC threshold, the discharge power is reduced, and the elevator is simultaneously commanded to reduce its operating speed to the first speed threshold. When the elevator is in the descent or braking phase, the energy storage control command controls the energy storage device to stop charging the grid and use the regenerated energy P_regen to replenish its own SOC. When the elevator is in standby mode, the energy storage control command controls the energy storage device to suspend charging and activates the internal voltage regulation circuit to maintain SOC stability.
[0029] Furthermore, voltage scaling strategies include: When the elevator is in the braking regeneration stage, the energy storage control command controls the energy storage device to suspend the charging of the lithium battery pack and switch to the energy shunt mode. The regenerated energy P_regen is temporarily stored in the supercapacitor through a dedicated channel and shunted with the first shunt current I_shunt. When the supercapacitor SOC reaches the third SOC threshold, the current limiting protection is activated, and the elevator is instructed to reduce the braking intensity. When the elevator is in the ascending or running phase, the energy storage control command controls the energy storage device to suspend its connection with the grid, maintaining only the internal energy circulation channel between the energy storage and the elevator; and according to the energy storage SOC level, it provides the elevator with full or proportional power supply, and synchronously commands the elevator to adjust its operating speed. When the elevator is in standby mode, the energy storage control command controls the energy storage device to disconnect from the power grid and maintain the internal low power consumption cycle.
[0030] Furthermore, the normal operating reference range of the elevator is voltage U∈[342V, 418V], frequency f∈[49.5Hz, 50.5Hz]; voltage drop trigger threshold U0 is 340V; voltage rise trigger threshold U1 is 420V; frequency abnormal threshold f0 is 49.5Hz, f1 is 50.5Hz.
[0031] Furthermore, in the voltage drop operation strategy, when U is lower than U0 and the elevator is in the rising stage, the energy storage control command controls the energy storage device to compensate with discharge power P_dis=P_ele-P_grid, and when SOC drops to 20%, the discharge power is reduced and the elevator is instructed to reduce its operating speed to 70%~80% of the rated speed.
[0032] Furthermore, in the voltage surge operation strategy, when U is higher than U1 and the elevator is in the braking regeneration stage, the energy storage control command controls the energy storage device to temporarily store the regenerated energy P_regen in the supercapacitor, and the shunt current I_shunt = P_regen / U_cap, where U_cap is the rated voltage of the supercapacitor; and when the supercapacitor SOC reaches 90%, I_shunt is reduced to 50% of the rated shunt current, and at the same time, the elevator is instructed to reduce the braking power to 70%~85% of the rated braking power.
[0033] Furthermore, the energy storage device includes one or more combinations of lithium batteries, sodium batteries, and supercapacitors; the elevator system includes one or more of elevators, escalators, robotic arms, and cranes.
[0034] like Figure 2 As shown, Figure 2 This is a flowchart illustrating the risk prevention and control method for the coordinated use of energy storage and elevators according to the present invention. Reference Figure 2 The present invention also proposes a method for risk prevention and control through the coordinated use of energy storage and elevators, comprising the following steps: S10, the voltage U and frequency f of the power grid are collected in real time through the power grid parameter monitoring module 10; S20 receives voltage U and frequency f data through the collaborative control module 40, as well as the elevator operation status from the elevator control module 20 and the energy storage device status from the energy storage execution module 30. S30, the cooperative control module 40 compares the received voltage U and frequency f data with the built-in voltage threshold range and frequency threshold range to identify the current power grid operating condition; S40, the cooperative control module 40, based on the identified power grid conditions and elevator operating status, calls the corresponding cooperative matching strategy from the built-in matching strategy database, generates energy storage control commands and elevator control commands, and performs control according to the control commands.
[0035] Furthermore, the voltage threshold range includes: the normal operating reference range of the elevator, the voltage drop trigger threshold U0, and the voltage rise trigger threshold U1, wherein U0 is lower than the lower limit of the reference range and U1 is higher than the upper limit of the reference range; the frequency threshold range includes the frequency anomaly thresholds f0 and f1.
[0036] In this embodiment, the factory power grid experienced multiple fluctuations between 9:00 and 10:00. The collaborative risk prevention and control system of the present invention responded as follows throughout the process: Step S10 involves real-time acquisition of the grid voltage U and frequency f by the grid parameter monitoring module 10. This module continuously monitors the electrical parameters at the factory grid input terminal at a sampling frequency of not less than 10kHz, specifically targeting a factory power supply system with a rated voltage of 380V and a rated frequency of 50Hz. During the typical working period from 9:00 to 10:00, the grid parameter monitoring module 10 captures multiple sets of electrical parameter changes in real time: from 9:00 to 9:30, the acquired voltage U remains stable within the range of 400V±2V, and the frequency f is maintained at 50Hz±0.1Hz; at 9:35, a voltage drop event caused by the start-up of a high-power air compressor is detected, with the real-time voltage dropping to 335V; at 9:50, a voltage surge event caused by machine tool shutdown is detected, with the voltage rising to 430V; at 9:58, a frequency anomaly event is detected, with the frequency briefly dropping to 49.3Hz. All collected raw electrical parameters are filtered by hardware to remove power frequency noise interference and converted into digital signals by analog-to-digital converters. Finally, standardized, high-precision real-time U and f data are output to the collaborative control module 40, providing accurate data support for subsequent power grid condition identification.
[0037] In this embodiment, step S20 receives real-time data from each monitoring and execution module through the collaborative control module 40. This collaborative control module 40, as the core hub of the system, receives three types of data input in parallel via high-speed communication: The first type of data comes from the power grid parameter monitoring module 10. Between 9:00 and 9:30, the coordinated control module 40 continuously receives standardized voltage U and frequency f data, specifically U = 400V ± 2V and f = 50Hz ± 0.1Hz. At 9:35, the received voltage data drops sharply to 335V; at 9:50, the received voltage data rises to 430V; and at 9:58, the received frequency data drops to 49.3Hz. All power grid data is updated in real time at a refresh rate of once every 20ms.
[0038] The second type of data comes from the elevator control module 20. The collaborative control module 40 receives real-time feedback on the elevator's operating status: from 9:00 to 9:30, it alternately receives the "ascending" status (corresponding to the loaded ascending condition) and the "descending / braking" status (corresponding to the unloaded descending and braking condition); at 9:35, the received status is "ascending", along with parameter information that the current load rate is 80% and the required power P_ele=22kW; at 9:50, the received status is "descending / braking", along with parameter information that the regenerative power P_regen=25kW; at 9:58, the received status is "standby".
[0039] The third type of data comes from the energy storage execution module 30. The collaborative control module 40 synchronously receives status feedback from the energy storage device: between 9:00 and 9:30, the received SOC value gradually increases from 45% to 48%; when the sudden drop event occurs at 9:35, the received SOC value is 48%, and the status information of the energy storage device being in "charging mode" is obtained; when the sudden rise event occurs at 9:50, the received SOC value of the supercapacitor is 40%, and the SOC value of the lithium battery pack is 52%.
[0040] In this embodiment, step S30 is executed by the collaborative control module 40. Its core function is to compare the real-time U and f data received in step S20 with the built-in thresholds one by one to accurately identify the power grid operating conditions. The module internally presets the normal voltage reference range as [342V, 418V], the frequency reference range as [49.5Hz, 50.5Hz], the voltage drop trigger threshold U0=340V, the voltage rise trigger threshold U1=420V, the frequency abnormal thresholds f0=49.5Hz, f1=50.5Hz, and is equipped with a 3-second recovery stabilization timer.
[0041] Taking the period from 9:00 to 10:00 as an example, when U = 400V ± 2V and f = 50Hz ± 0.1Hz are received from 9:00 to 9:30, the module determines that both U and f are within the reference range and no abnormal threshold is triggered, and it is identified as "normal grid condition". When U drops to 335V at 9:35, the module compares it with U0. Since 335V < 340V, it is immediately identified as "voltage dip condition". When U rises to 430V at 9:50, since 430V > U1 = 420V, it is identified as "voltage surge condition". When f drops to 49.3Hz at 9:58, although U = 398V is normal, since 49.3Hz < f0 = 49.5Hz, it is still identified as "frequency abnormal condition". By 10:00, U returns to 400V and f returns to 50Hz. The module starts a 3-second stable timing. During this period, continuous monitoring shows that neither U nor f triggers an abnormality again. After the timing ends, it is identified as "recovery condition".
[0042] It should be noted that step S30 identifies the grid condition only based on U and f data; parameters such as the required power P_ele of the elevator and the regenerative power P_regen have been received in S20, but are reserved for use as execution parameters when the strategy in step S40 is called.<##
[0043] As Figure 3 shown Figure 3 is the state transition logic diagram of the energy storage and elevator collaborative risk prevention and control system.
[0044] Referring to Figure 3 , the state transition logic of the energy storage and elevator collaborative risk prevention and control system is as follows: The system takes the normal state as the core. When the grid voltage drops suddenly (U < U0), it switches to the energy replenishment state, and the energy storage discharges to replenish energy for the elevator; when the grid voltage surges (U > U1), it switches to the shunt state to temporarily store the braking regenerative energy of the elevator; when the elevator motor is turned off, it enters the standby state, and the energy storage maintains low-power voltage stabilization. In the standby state, if the grid frequency is abnormal (f < f0 or f > f1), the system will enter the protection state, starting the pre-discharge or energy shunt channel to standby; when the grid voltage returns to the normal range (U0 + 2 ≤ U ≤ U1 - 2) and the frequency is stable within the [f0, f1] range, the energy replenishment state and the shunt state can switch back to the normal state, the protection state can switch back to the standby state, and the standby state can return to the normal state through the start operation of the elevator motor, so as to achieve continuous and stable operation and risk prevention and control under grid fluctuations.
[0045] Furthermore, the collaborative matching strategy in step S40 includes the following five working condition strategies, and this embodiment will explain them in detail corresponding to five scenarios respectively.
[0046] Furthermore, the normal operating strategy of the power grid is as follows: when the voltage U and frequency f are within the reference range and frequency threshold range respectively, i.e., U∈[U0+2, U1-2]=[342V, 418V], f∈[f0, f1]=[49.5Hz, 50.5Hz], the energy storage control command controls the energy storage device to operate in charging recovery mode, charging with a first charging current range I_chg=0.3C~0.5C, and maintaining the SOC in the first SOC range k0~k1 (30%~80%); when the elevator is in the braking stage, the first recharge current range I_chg=0.3C~0.5C is used for charging. The regenerative energy recovery rate is 85%~95%, and the charging power P_chg = P_regen × 85%~95% is recorded as the regenerative energy P_regen. The elevator control command controls the elevator to operate within the rated operating power range P_ele = PN × 90%~100%, and the operating speed follows the preset operating condition curve. The traction motor current I_motor is controlled within the range of IN × 80%~110% to ensure stable operation, where IN is the rated current. In this embodiment, PN = 22kW is taken, that is, 100% rated power operation.
[0047] In this embodiment, corresponding to the time period (9:00-9:30): the grid voltage U=400V and the frequency f=50Hz, both within the normal operating baseline range. The elevator frequently performs ascending and descending tasks. The collaborative control module 40 identifies "normal grid operating condition" and the elevator as being in "operating state," and invokes the "normal grid operating condition strategy." The energy storage execution module 30 operates in "charging recovery mode." When the elevator ascends and consumes power, the energy storage device charges from the grid with a current of 0.4C (40A). When the elevator descends and brakes, the grid parameter monitoring module 10 detects an increase in DC bus voltage, and the collaborative control module 40 immediately instructs the energy storage execution module 30 to switch to energy recovery, recovering regenerated energy at a rate of 90% (approximately 19.8kW), with the SOC slowly increasing from 45% to 48%. The elevator control module 20 operates smoothly throughout the entire process at a rated power of 22kW and a preset speed curve, with the motor current stabilizing between 90% and 105% of the rated current. This achieves efficient recovery of regenerated energy, and the system operates smoothly.
[0048] Furthermore, the voltage sag operation strategy is as follows: when U is lower than U0, the energy storage control command controls the energy storage device to switch to discharge replenishment mode, and the specific matching strategy is as follows: Voltage Drop Condition 1: When the elevator is in the ascending phase (high load power demand), the operation mode of the energy storage execution module 30 and the elevator control module 20 is as follows: Energy storage execution module 30: discharge power P_dis=P_ele-P_grid, discharge current I_dis=P_dis / U_bat, ensuring that the total power supplied to the elevator meets the operating requirements P_ele=P_grid+P_dis; the lower limit of SOC is set to 20%. When the SOC drops to k0-10% (i.e. 20%), the discharge power is automatically reduced, and the elevator is synchronously instructed to reduce the operating speed to 70%~80% of the rated speed to maintain the core operating requirements and avoid excessive discharge of energy storage. Elevator control module 20: Maintains stable traction motor torque, and controls the current I_motor at 90%~105% of the rated current to avoid sudden speed changes due to power fluctuations; if the undervoltage environment deteriorates further, such as the mains voltage continuously falling below U0-20V (i.e. 320V), it activates the light load priority mode, prioritizes completing the current upward stroke, and then smoothly stops at the nearest floor, responding to new commands only after the voltage is restored.
[0049] Voltage Drop Condition 2: When the elevator is in the descent or braking phase, the energy storage execution module 30 and the elevator control module 20 operate as follows: Energy storage execution module 30: Suspends charging to the grid, discharges power P_dis=P_regen, and directly uses the regenerated energy to replenish its own SOC, maintaining the SOC at k0~k1; if there is excess regenerated energy, it activates the internal voltage regulation circuit, adjusting the current I=P_regen / U_bat through the bidirectional converter to avoid overcurrent impact. Elevator control module 20: The braking current I_brake is maintained at 80%~90% of the rated braking current to ensure smooth braking and stable regenerated energy output.
[0050] Voltage Drop Condition 3: When the elevator is in standby mode, the energy storage execution module 30 and the elevator control module 20 operate as follows: Energy storage execution module 30: Pause charging, activate the internal voltage regulation circuit, and maintain SOC stability (fluctuation range ≤ ±2%) through low power mode; current I_stab ≤ 0.05C to reduce energy loss. Elevator control module 20: Maintain standby power consumption, monitor the status of the energy storage device, and synchronously restart the energy storage charging mode after the grid voltage recovers to above 342V and stabilizes for 3 seconds.
[0051] In this embodiment, corresponding to the time period (9:35-9:40): the start-up of a large air compressor causes the grid voltage to drop momentarily to 335V (below U0=340V), lasting for approximately 5 seconds. At this time, the elevator is ascending with a load, requiring a power of P_ele=22kW. The collaborative control module 40 determines this as a "voltage drop condition" and, upon receiving the elevator status as "ascending," invokes the aforementioned voltage drop condition 1 strategy. The energy storage execution module 30 switches from "charging mode" to "discharging and replenishing mode" within 20ms. Due to the voltage drop, the actual grid power supply P_grid decreases to 15kW. The energy storage device immediately compensates with a discharge power of P_dis=22kW-15kW=7kW, with a discharge current I_dis=7kW / 640V≈11A, ensuring the elevator's total power supply remains at 22kW. Because the power supply is promptly compensated, the elevator control module 20 maintains stable traction motor torque, without stalling or stopping, and continues to complete the ascent at the original speed. During this period, the energy storage SOC dropped from 48% to 46%. After the voltage recovered to 380V and stabilized for 3 seconds, the system switched back to normal mode according to the recovery operating condition strategy.
[0052] Voltage surge protection strategy: When U is higher than U1, the energy storage control command controls the energy storage device to start energy diversion mode or internal circulation mode. The specific matching strategy is as follows: Voltage Surge Condition 1: When the elevator is in the braking regeneration stage (generating regenerative energy), the operation mode of the energy storage execution module 30 and the elevator control module 20 is as follows: Energy storage execution module 30: Immediately suspends lithium battery pack charging, switches to "energy shunt mode", and temporarily stores the elevator's braking regeneration energy in the supercapacitor through a dedicated channel. The shunt power P_shunt = P_regen, and the shunt current I_shunt = P_regen / U_cap. The supercapacitor SOC is maintained at k0~k1. If the supercapacitor SOC reaches 90%, the current limiting protection is activated, and I_shunt drops to 50% of the rated shunt current. At the same time, the elevator is instructed to appropriately reduce the braking intensity and reduce the regeneration energy output. Elevator control module 20: Braking power P_brake = rated braking power × 70%~85% to avoid excessive regeneration energy; traction motor frequency f_motor is maintained at f0~f1 to ensure a smooth braking process.
[0053] Voltage Surge Condition 2: When the elevator is in the ascending and operating stage, the operating modes of the energy storage execution module 30 and the elevator control module 20 are as follows: Energy storage execution module 30: Suspend the connection with the power grid, and only retain the internal energy circulation channel between the energy storage and the elevator; if the energy storage SOC ≥ k0, supply power to the elevator P_sup = P_ele × 100% - 110%, current I_sup = P_ele / U_bat; if SOC < k0, start the energy-saving mode, P_sup = P_ele × 80% - 90%, and synchronously instruct the elevator to reduce the operating speed to 70% - 80% of the rated speed. Elevator control module 20: The operating power dynamically adjusts following the power supplied by the energy storage, current I_motor ≤ IN × 95%, to avoid overload; if the overvoltage state continues to deteriorate, for example, the grid voltage continuously exceeds U1 + 30V (i.e., 450V), after completing the current journey, stop smoothly. After the voltage returns to below U1 - 2V (i.e., 418V) and stabilizes for 3s, resume normal operation.
[0054] Voltage Surge Condition 3: When the elevator is in the standby stage, the operating modes of the energy storage execution module 30 and the elevator control module 20 are as follows: Energy storage execution module 30: Cut off the connection with the power grid, maintain the internal low-power circulation, and the SOC fluctuation range ≤ ±3%; the supercapacitor is in a standby state, ready to receive possible sudden regenerative energy at any time. Elevator control module 20: Maintain the standby state and prohibit the start of new operation instructions until the voltage returns to normal.
[0055] In this embodiment, corresponding to the time period (9:50-9:55): a large machine tool stops, causing the grid voltage to surge to 430V (higher than U1=420V); simultaneously, another elevator descends at full load, in a strong braking and regeneration phase, generating a large amount of regenerative energy P_regen, approximately 25kW. The collaborative control module 40 determines this as a "voltage surge condition" and, upon receiving the elevator status as "descending / braking," invokes the "braking and regeneration phase" sub-strategy in the "voltage surge condition strategy." The energy storage execution module 30 immediately cuts off the lithium battery charging circuit to prevent overvoltage damage to the lithium battery and switches to energy shunt mode, temporarily storing all the regenerative energy P_regen generated by the elevator braking to the supercapacitor through a dedicated DC / DC channel. The shunt current I_shunt = P_regen / U_cap = 25kW / 350V ≈ 71.4A. When the supercapacitor's SOC reaches the 90% threshold, the energy storage execution module 30 activates current limiting protection, automatically reducing the shunt current to 50% of the rated shunt current (approximately 35.7A). Simultaneously, the elevator control module 20 receives instructions from the coordination control module 40 and appropriately reduces the braking intensity when the supercapacitor reaches the current limiting point, smoothly adjusting the braking power from 25kW to 80% of the rated braking power (approximately 20kW), ensuring a smooth and shock-free braking process. Through continuous shunt, the supercapacitor temporarily stores approximately 0.8kWh of regenerative energy, and the SOC rises from 40% to 85%, avoiding energy recovery interruption and braking performance degradation due to overvoltage. The regenerative energy is successfully temporarily stored.
[0056] Furthermore, the frequency abnormal operating condition strategy is as follows: when f is lower than f0 or higher than f1, the cooperative control module 40 refers to the voltage drop operating condition strategy or the voltage rise operating condition strategy respectively to trigger the energy storage device to enter the pre-discharge mode or start the energy diversion channel.
[0057] In this embodiment, corresponding to time point (9:58): the grid frequency fluctuates, briefly dropping to 49.3Hz (below f0=49.5Hz), but the voltage has not yet dropped sharply (U=398V). The cooperative control module 40 detects f=49.3Hz and determines it as a "frequency abnormal condition," triggering it in advance according to the "voltage drop condition strategy." The energy storage execution module 30 starts the "pre-discharge mode," discharging slightly to the internal bus of the system at 30% of the rated power (approximately 6.6kW) to establish an energy buffer in advance, preparing for a possible voltage drop. Subsequently, the grid frequency recovers to above 49.6Hz within 10 seconds, and the voltage does not drop sharply. After the cooperative control module 40 detects that the frequency has returned to normal and remained stable for 3 seconds, it instructs the energy storage execution module 30 to exit the pre-discharge mode, stop discharging, and the system returns to standby state. In this embodiment, only the frequency low abnormality occurs. If the frequency high abnormality occurs (such as f>50.5Hz), the system will refer to the voltage rise condition strategy and start the energy diversion channel in advance.
[0058] Furthermore, the recovery strategy is as follows: when U and f tend to be within the normal range and the stabilization time reaches the preset time, the energy storage control command controls the energy storage device to gradually switch back to the charging recovery mode, and transfers the temporarily stored energy to the energy storage device with a preset transfer power. The elevator control module 20 gradually restores the rated operating power and speed of the elevator.
[0059] In this embodiment, corresponding to the time point (10:00): both voltage and frequency have returned to the normal range (U=400V, f=50Hz) and remain stable for more than 3 seconds. The collaborative control module 40 determines this as a "recovery condition" and invokes the "recovery condition strategy". The energy storage execution module 30 smoothly transfers the energy temporarily stored in the supercapacitor (approximately 0.8kWh) to the lithium battery pack at 50% of the rated power (in this embodiment, PN×50%=11kW is taken as the transfer power), with the charging current rising smoothly without any impact. After the supercapacitor's SOC drops to the normal range, the energy storage device fully switches back to the normal "charging and recovery mode". The elevator control module 20 returns to normal standby, ready to respond to the next operating command.
[0060] As demonstrated by the above embodiments: In the case of a voltage drop, the energy storage device completes mode switching within 20ms and compensates with 7kW power, preventing the 22kW elevator from stalling and shutting down; in the case of a voltage surge, the supercapacitor recovers 25kW of regenerative energy with a 71.4A diversion, avoiding energy waste and reduced braking performance; in the case of frequency anomalies, the system pre-discharges 6.6kW in advance to achieve proactive intervention. This verifies that the present invention can transform passive shutdown response to grid fluctuations into proactive energy dispatch, maximizing the utilization efficiency of regenerative energy while ensuring production continuity.
[0061] Furthermore, the energy storage device includes one or more combinations of lithium batteries, sodium batteries, and supercapacitors; the elevator system includes one or more of elevators, escalators, robotic arms, and cranes.
[0062] This invention transforms the passive shutdown response to grid fluctuations into proactive energy dispatch. Through a defined U / f threshold, a matching strategy covering all operating conditions, and quantifiable execution parameters, it enables seamless collaborative operation of energy storage devices and elevators under grid fluctuations, maximizing the utilization efficiency of renewable energy while ensuring production continuity.
[0063] The above are only some embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made under the technical concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.
Claims
1. A collaborative risk prevention and control system for energy storage and elevators, characterized in that, include: The system includes a power grid parameter monitoring module, a elevator control module, an energy storage execution module, and a collaborative control module. The power grid parameter monitoring module is used to collect the electrical parameters of the power grid in real time, and output the electrical parameters after filtering and analog-to-digital conversion; wherein, the electrical parameters include voltage U and frequency f; The elevator control module is used to control the operation of the elevator and provide real-time feedback on the operating status of the elevator, including ascending, descending / braking, and standby. The energy storage execution module is used to control the charging and discharging mode, power output and current regulation of the energy storage device, and to provide real-time feedback on the status of the energy storage system to the collaborative control module, including the state of charge (SOC). The collaborative control module is communicatively connected to the power grid parameter monitoring module, the elevator control module, and the energy storage execution module. The collaborative control module has a built-in voltage threshold range, frequency threshold range, and matching strategy database. It compares the real-time voltage U and frequency f data with the built-in voltage threshold range and frequency threshold range to identify the current power grid operating condition.
2. The energy storage and elevator collaborative risk prevention and control system according to claim 1, characterized in that, The collaborative control module is also used to receive real-time voltage U and frequency f data from the power grid parameter monitoring module, receive elevator operating status from the elevator control module, and receive energy storage device status from the energy storage execution module. Based on the identified power grid operating conditions and the received elevator operating status, it calls the corresponding collaborative matching strategy from the matching strategy database, generates and sends energy storage control commands to the energy storage execution module, and sends elevator control commands to the elevator control module. The energy storage execution module dynamically adjusts the charging and discharging mode, power, and current of the energy storage device according to the received energy storage control commands; The elevator control module dynamically adjusts the elevator's operating power and / or operating speed according to the received elevator control commands.
3. The energy storage and elevator collaborative risk prevention and control system according to claim 1, characterized in that, The voltage threshold range includes: the normal operation reference range of the elevator, the voltage drop trigger threshold U0, and the voltage rise trigger threshold U1, wherein U0 is lower than the lower limit of the reference range, and U1 is higher than the upper limit of the reference range; the frequency threshold range includes frequency anomaly thresholds f0 and f1.
4. The energy storage and elevator collaborative risk prevention and control system according to claim 3, characterized in that, The collaborative matching strategy includes: Normal operating conditions of the power grid: When the voltage U and frequency f data are within the reference range and frequency threshold range respectively, the energy storage control command controls the energy storage device to operate in the charging recovery mode, charging with the first charging current range and maintaining the SOC in the first SOC range; when the elevator is in the braking stage, regenerative energy is recovered with the first regenerative energy recovery ratio; the elevator control command controls the elevator to operate within the rated operating power range. Voltage sag strategy: When U is lower than U0, the energy storage control command controls the energy storage device to switch to discharge replenishment mode; Voltage surge strategy: When U is higher than U1, the energy storage control command controls the energy storage device to start the energy diversion mode or the internal circulation mode. Frequency abnormal operation strategy: When f is lower than f0 or higher than f1, the cooperative control module refers to the voltage drop operation strategy or voltage rise operation strategy respectively to trigger the energy storage device to enter the pre-discharge mode or start the energy diversion channel. Recovery Strategy: When U and f approach the normal range and the stabilization time reaches the preset time, the energy storage control command controls the energy storage device to gradually switch back to the charging recovery mode, and transfers the temporarily stored energy to the energy storage device with a preset transfer power. The elevator control module gradually restores the rated operating power and speed of the elevator.
5. The energy storage and elevator collaborative risk prevention and control system according to claim 4, characterized in that, The voltage sag operation strategy includes: When the elevator is in the ascending phase, the energy storage control command controls the energy storage device to compensate with a first discharge power P_dis, where P_dis = P_ele - P_grid, P_ele is the power demanded by the elevator, and P_grid is the actual power supplied by the power grid; and when the SOC drops to the second SOC threshold, the discharge power is reduced, and the elevator is simultaneously commanded to reduce its operating speed to the first speed threshold. When the elevator is in the descent or braking phase, the energy storage control command controls the energy storage device to stop charging the grid and use the regenerated energy P_regen to replenish its own SOC. When the elevator is in standby mode, the energy storage control command controls the energy storage device to pause charging and activates the internal voltage regulation circuit to maintain SOC stability.
6. The energy storage and elevator collaborative risk prevention and control system according to claim 4, characterized in that, The voltage surge condition strategy includes: When the elevator is in the braking regeneration stage, the energy storage control command controls the energy storage device to suspend the charging of the lithium battery pack, switch to the energy diversion mode, temporarily store the regenerated energy P_regen to the supercapacitor through a dedicated channel, and divert it with the first diversion current I_shunt; and when the supercapacitor SOC reaches the third SOC threshold, the current limiting protection is activated, and the elevator is instructed to reduce the braking intensity. When the elevator is in the ascending or running phase, the energy storage control command controls the energy storage device to suspend its connection with the power grid, retaining only the internal energy circulation channel between the energy storage and the elevator; and according to the energy storage SOC level, it provides the elevator with full or proportional power supply, and synchronously commands the elevator to adjust its operating speed. When the elevator is in standby mode, the energy storage control command controls the energy storage device to disconnect from the power grid and maintain an internal low-power cycle.
7. The energy storage and elevator collaborative risk prevention and control system according to claim 4, characterized in that, The normal operating reference range of the elevator is voltage U∈[342V, 418V] and frequency f∈[49.5Hz, 50.5Hz]; the voltage drop trigger threshold U0 is 340V; the voltage rise trigger threshold U1 is 420V; and the frequency anomaly thresholds f0 and f1 are 49.5Hz and 50.5Hz, respectively.
8. The energy storage and elevator collaborative risk prevention and control system according to claim 4, characterized in that, In the voltage drop operation strategy, when U is lower than U0 and the elevator is in the ascending stage, the energy storage control command controls the energy storage device to compensate with discharge power P_dis=P_ele-P_grid, and when SOC drops to 20%, the discharge power is reduced and the elevator is instructed to reduce its operating speed to 70%~80% of the rated speed.
9. The energy storage and elevator collaborative risk prevention and control system according to claim 4, characterized in that, In the voltage surge working condition strategy, when U is higher than U1 and the elevator is in the braking regeneration stage, the energy storage control command controls the energy storage device to temporarily store the regenerated energy P_regen in the supercapacitor, and the shunt current I_shunt=P_regen / U_cap, where U_cap is the rated voltage of the supercapacitor. When the supercapacitor's SOC reaches 90%, I_shunt is reduced to 50% of the rated shunt current, and the elevator is instructed to reduce its braking power to 70%~85% of the rated braking power.
10. A method for risk prevention and control of energy storage and elevator coordination based on the system of claim 1, characterized in that, Includes the following steps: S10, the voltage U and frequency f of the power grid are collected in real time through the power grid parameter monitoring module; S20 receives voltage U and frequency f data through the collaborative control module, as well as the elevator operation status from the elevator control module and the energy storage device status from the energy storage execution module. S30, the cooperative control module compares the received voltage U and frequency f data with the built-in voltage threshold range and frequency threshold range to identify the current power grid operating condition; S40, the collaborative control module, based on the identified power grid conditions and elevator operating status, calls the corresponding collaborative matching strategy from the built-in matching strategy database, generates energy storage control commands and elevator control commands, and performs control according to the control commands.