Energy storage online UPS control system and control method thereof

Abstract

According to the energy storage online UPS control system and the control method thereof, the direct current bus voltage can be accurately adjusted through the energy management device according to the battery state information obtained in real time and the current time point, the standby mode of the power grid side energy storage converter is triggered according to needs, the power consumption in each time period is flexibly adjusted and controlled, and the power consumption is reduced. Stable power supply is ensured and power utilization cost is reduced. Meanwhile, the battery monitoring device periodically collects the state information of each battery cell in the battery energy storage device, fine management of the battery is achieved, the abnormal state of the battery can be found in time, the problems of over-charging, over-discharging and the like of the battery are avoided, the service life of the battery is prolonged, and safety is improved. In addition, when the mains supply is stable, the power grid side energy storage converter enters a standby state, so that the operation burden of the system is reduced; and the load side energy storage converter is accurately adjusted and outputs stable alternating current according to the preset load voltage all the time, so that continuous operation of load equipment is ensured.

Description

Technical Field

[0001] This application relates to the field of online UPS technology, and in particular to an energy storage online UPS control system and its control method. Background Technology

[0002] With the rapid development of the information age, the requirements for the reliability and stability of power supply for various equipment and systems are increasing. Especially for critical equipment such as data centers, communication base stations, and medical equipment, power outages or fluctuations can have serious consequences. Therefore, UPS (Uninterruptible Power Supply) systems are widely used to ensure that the load continues to be powered even when the mains power fails.

[0003] Currently, the mainstream UPS systems on the market still adopt the switching PCS-dominated mode, which switches the power supply path between mains power and battery energy storage via the PCS. However, this mode has an unavoidable switching delay: for low-power loads, the switching time is about 10-20 milliseconds, while for high-power loads it can reach more than 100 milliseconds. Brief power interruptions or voltage fluctuations may occur during the switching process, affecting the normal operation of the load equipment. Although the switching PCS mode can guarantee power supply to the load in most cases, the potential risks posed by its switching delay cannot be ignored for high reliability requirements or sensitive loads.

[0004] Therefore, there is an urgent need for a new type of online UPS control system that can achieve seamless switching and improve system operation safety. Summary of the Invention

[0005] This application provides an online UPS control system and control method for energy storage, which at least partially solves the above-mentioned problems.

[0006] In a first aspect, this application provides an online UPS control system for energy storage, comprising: an energy management device, a grid-side energy storage converter, a load-side energy storage converter, at least one battery energy storage device, and at least one battery monitoring device;

[0007] The energy management device is configured to receive the status information transmitted by the battery monitoring device; when the mains power provides stable AC power, it determines the DC bus voltage based on the status information and the current time point, and triggers the grid-side energy storage converter and the battery monitoring device based on the DC bus voltage, and also triggers the load energy storage converter.

[0008] The grid-side energy storage converter is configured to enter a standby state when the energy management device triggers a signal indicating the cessation of converting AC mains input into DC input to the DC bus.

[0009] The battery monitoring device is configured to periodically collect the status information of each cell in the battery energy storage device and transmit it to the energy management device; when the energy management device is triggered to indicate that power is being supplied to the load, a preset load voltage is used as the DC bus voltage and the battery energy storage device is controlled to input DC power to the DC bus.

[0010] The load-side energy storage converter is configured to, upon being triggered, convert the DC power from the DC bus into AC power based on the load voltage and output it to the load.

[0011] Preferably,

[0012] The energy management device is configured as follows:

[0013] When the mains provides a stable AC power supply and the current time is during the peak power consumption period, the load voltage is used as the DC bus voltage.

[0014] When it is determined that the status information indicates that the battery power of the at least one battery energy storage device is higher than a preset battery protection threshold, the grid-side energy storage converter is triggered to enter a standby state based on the DC bus voltage, and the battery monitoring device is triggered to control the battery energy storage device to input DC power to the DC bus.

[0015] Preferably,

[0016] The energy management device is configured as follows:

[0017] When the current time point is during the peak power consumption period, and the status information indicates that the battery capacity of the at least one battery energy storage device is not higher than the battery protection threshold, the load voltage is used as the DC bus voltage.

[0018] The grid-side energy storage converter is triggered to convert the AC power input from the mains into DC power based on the DC bus voltage and input it into the DC bus.

[0019] The battery monitoring device is triggered to disconnect the at least one battery energy storage device from the DC bus.

[0020] Preferably,

[0021] The energy management device is further configured to:

[0022] When the current time point is in the off-peak electricity consumption period, a preset charging voltage corresponding to the off-peak electricity consumption period is determined, and the preset charging voltage is used as the DC bus voltage. The output power corresponding to the preset charging voltage is not less than the sum of the power of the at least one battery energy storage device during charging and the power consumption of the load.

[0023] The grid-side energy storage converter is triggered to convert the AC power input from the mains into DC power based on the DC bus voltage and input it into the DC bus.

[0024] The battery monitoring device is triggered to connect the input terminal of the at least one battery energy storage device to the DC bus, so as to charge the battery energy storage device through the DC bus.

[0025] Preferably,

[0026] The battery monitoring device is configured to switch the battery storage device to float charging state and set the charging power to zero after the energy management device is triggered to indicate that the battery storage device is being charged.

[0027] Preferably,

[0028] The energy management device is further configured to:

[0029] When the current time point is within the normal power consumption period, the load voltage is used as the DC bus voltage;

[0030] The grid-side energy storage converter is triggered to convert the AC power input from the mains into DC power based on the DC bus voltage and input it into the DC bus;

[0031] The battery monitoring device is triggered to disconnect the connection between the at least one battery energy storage device and the DC bus.

[0032] Preferably,

[0033] The battery monitoring device is configured as follows:

[0034] A: Determine whether each parameter in the collected status information is within the safety threshold range used to characterize the battery status safety. If yes, proceed to step E; otherwise, proceed to step B.

[0035] B: Determine whether the parameter that is not within the safety threshold range is within the alarm threshold range used to characterize abnormal battery status. If yes, proceed to step C; otherwise, proceed to step D.

[0036] C: Disconnect the at least one battery energy storage device from the DC bus;

[0037] D: Transmit a critical safety signal to the energy management device to characterize a battery malfunction;

[0038] E: Perform the periodic acquisition of status information of each cell in the battery energy storage device;

[0039] The energy management device is further configured to, upon receiving the critical safety signal, control both the grid-side energy storage converter and the load-side energy storage converter to enter a standby state and output alarm information containing the status information, wherein the output method of the alarm information includes at least one of SMS push, email push, voice call notification and platform system message push.

[0040] Preferably,

[0041] The energy management device is further configured to analyze the received status information to obtain analysis results and output the analysis results.

[0042] Preferably,

[0043] Each of the battery energy storage devices consists of at least three cells connected in series and / or in parallel.

[0044] Preferably,

[0045] The energy storage online UPS control system also includes at least one energy storage cabinet and at least one sensor;

[0046] Each of the energy storage cabinets is equipped with at least one sensor, at least one of the battery energy storage devices, and a battery monitoring device corresponding to the battery energy storage device;

[0047] The sensor is configured to detect environmental parameters within the energy storage cabinet and transmit the environmental parameters to the battery monitoring device located in the same energy storage cabinet as the sensor. The environmental parameters include at least one of temperature, humidity, and the concentration of at least one gas.

[0048] The battery monitoring device is also configured to transmit the environmental parameters to the energy management device; when it is determined that the environmental parameters are not within the environmental threshold range used to characterize the environmental safety inside the energy storage cabinet, disconnect the connection between the at least one battery energy storage device and the DC bus, and transmit an environmental abnormality signal to the energy management device.

[0049] The energy management device is also configured to receive the environmental parameters, and when it receives the environmental abnormality signal, to control both the grid-side energy storage converter and the load-side energy storage converter to enter a standby state and output alarm information containing the environmental parameters.

[0050] Preferably,

[0051] The energy management device is configured to perform the following when the mains power is abnormal:

[0052] The system outputs alarm information indicating a mains power anomaly and controls the grid-side energy storage converter to enter standby mode.

[0053] The load voltage is used as the DC bus voltage, and the battery monitoring device is triggered to execute and control the battery energy storage device to input DC power to the DC bus based on the DC bus voltage.

[0054] When the status information indicates that the battery power of the at least one battery energy storage device is not higher than a preset battery protection threshold, an alarm message containing the message that the battery power of the at least one battery energy storage device is not higher than the battery protection threshold is output.

[0055] Preferably,

[0056] The energy storage online UPS control system also includes a load meter;

[0057] The load meter is configured to collect the first power data output from the load-side energy storage converter to the load, and transmit the first power data to the energy management device.

[0058] The energy management device is configured to receive the first power data and output the first power data.

[0059] Preferably,

[0060] The energy storage online UPS control system also includes a power grid meter;

[0061] The power grid meter is configured to collect second power data input from the mains power input terminal to the DC bus, and transmit the second power data to the energy management device.

[0062] The energy management device is configured to receive the second power data and output the second power data.

[0063] Preferably,

[0064] The energy storage online UPS control system also includes an energy storage meter;

[0065] The energy storage meter is configured to collect third energy data output from the output terminal of the at least one battery energy storage device and transmit the third energy data to the energy management device.

[0066] The energy management device is configured to receive the third power data and output the third power data.

[0067] Secondly, this application provides a control method for an online UPS control system for energy storage, comprising:

[0068] The battery monitoring device periodically collects the status information of each cell in the battery energy storage device and transmits it to the energy management device.

[0069] The energy management device receives the status information transmitted by the battery monitoring device; when the mains power provides stable AC power, the DC bus voltage is determined based on the status information and the current time point, and the grid-side energy storage converter and battery monitoring device are triggered based on the DC bus voltage, and the load energy storage converter is also triggered.

[0070] When the grid-side energy storage converter is triggered by the energy management device to indicate the cessation of converting AC power input from the mains to DC power input to the DC bus, it enters a standby state.

[0071] When the battery monitoring device is triggered by the energy management device to indicate that power is being supplied to the load, the preset load voltage is used as the DC bus voltage and the battery energy storage device is controlled to input DC power to the DC bus.

[0072] After the load-side energy storage converter is triggered, it converts the DC power from the DC bus into AC power based on the load voltage and outputs it to the load.

[0073] This application provides an online UPS control system and method with energy storage. Through the coordinated operation of an intelligent energy management device, a battery energy storage device, and a battery monitoring device, the system effectively solves the problems of low energy efficiency, serious energy waste, and insufficient battery management in existing UPS systems. Specifically, the energy management device can precisely adjust the DC bus voltage based on real-time battery status information and the current time, and trigger the standby mode of the grid-side energy storage converter as needed, achieving flexible control of power consumption at different times, ensuring stable power supply and reducing electricity costs. Simultaneously, the battery monitoring device periodically collects the status information of each cell in the battery energy storage device, achieving refined battery management, timely detection of battery anomalies, and prevention of overcharging and over-discharging, thereby extending battery life and improving safety. Furthermore, when the mains power supply is stable, the grid-side energy storage converter enters standby mode, reducing the system's operating burden; the load-side energy storage converter always precisely adjusts and outputs stable AC power according to the preset load voltage, ensuring continuous operation of the load equipment. Attached Figure Description

[0074] Figure 1 This is a schematic diagram of an online UPS control system for energy storage provided in an embodiment of this application;

[0075] Figure 2 This is a schematic diagram of another energy storage online UPS control system provided in an embodiment of this application;

[0076] Figure 3 This is a flowchart of a control method for an online UPS control system for energy storage provided in an embodiment of this application. Detailed Implementation

[0077] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0078] Figure 1 A schematic diagram of an online UPS control system for energy storage provided in one embodiment of this application is shown below:

[0079] Energy management device 101, grid-side energy storage converter 102, load-side energy storage converter 103, at least one battery energy storage device 104, at least one battery monitoring device 105;

[0080] The energy management device 101 is configured to receive status information transmitted by the battery monitoring device 105; when the mains power provides stable AC power, it determines the DC bus voltage based on the status information and the current time point, and triggers the grid-side energy storage converter 102 and the battery monitoring device 105 based on the DC bus voltage, and triggers the load energy storage converter 103.

[0081] The grid-side energy storage converter 102 is configured to enter a standby state when the energy management device 101 triggers a signal indicating the cessation of converting AC power input from the mains into DC power input to the DC bus.

[0082] The battery monitoring device 105 is configured to periodically collect the status information of each cell in the battery energy storage device 104 and transmit it to the energy management device 101; when the energy management device 101 is triggered to indicate the supply of power to the load, the preset load voltage is used as the DC bus voltage and each battery energy storage device 104 is controlled to input DC power to the DC bus.

[0083] The load-side energy storage converter 103 is configured to, upon being triggered, convert the DC power from the DC bus into AC power based on the load voltage and output it to the load.

[0084] In this embodiment, the collaborative operation of the intelligent energy management device, battery energy storage device, and battery monitoring device effectively solves the problems of low energy efficiency, serious energy waste, and insufficient battery management in existing UPS systems. Specifically, the energy management device can precisely adjust the DC bus voltage based on real-time battery status information and the current time, and trigger the standby mode of the grid-side energy storage converter as needed, achieving flexible control of power consumption at different times, ensuring stable power supply and reducing electricity costs. Simultaneously, the battery monitoring device periodically collects the status information of each cell in the battery energy storage device, achieving refined battery management, timely detection of battery anomalies, and prevention of overcharging and over-discharging, thereby extending battery life and improving safety. Furthermore, when the mains power supply is stable, the grid-side energy storage converter enters standby mode, reducing the system's operational burden; the load-side energy storage converter always precisely adjusts and outputs stable AC power according to the preset load voltage, ensuring continuous operation of the load equipment.

[0085] In one embodiment of this application, the energy management device is configured as follows:

[0086] When the mains provides a stable AC power supply and the current time is during the peak power consumption period, the load voltage is used as the DC bus voltage.

[0087] When the status information indicates that the battery charge of at least one battery energy storage device is higher than the preset battery protection threshold, the grid-side energy storage converter is triggered to enter the standby state based on the DC bus voltage, and the battery monitoring device is triggered to control the battery energy storage device to input DC power to the DC bus.

[0088] In this embodiment, the energy management device accurately judges the stability of the mains power supply and the current time period, flexibly adjusting the DC bus voltage. During peak / off-peak electricity consumption periods, it rationally utilizes the battery energy storage device, effectively reducing the impact of peak electricity prices on system operation. When the mains provides stable AC power and the battery has sufficient charge, it automatically adjusts the DC bus voltage based on the load voltage, while simultaneously stopping the switching operation of the grid-side energy storage converter to avoid unnecessary energy waste and minimize the pressure on power demand during peak periods. Furthermore, ensuring the battery charge is above the protection threshold, it can automatically switch to power provided by battery energy storage, maintaining a stable power supply without relying on the mains, thereby improving energy efficiency and saving electricity costs. This approach not only enhances the overall economic efficiency of the system but also ensures a stable power supply during peak electricity price periods and extends battery life.

[0089] In one embodiment of this application, the energy management device is configured as follows:

[0090] When the current time point is during the peak power consumption period, and the status information indicates that the battery capacity of at least one battery energy storage device is not higher than the battery protection threshold, the load voltage is used as the DC bus voltage.

[0091] The grid-side energy storage converter is triggered to convert the AC power input from the mains into DC power based on the DC bus voltage and input it into the DC bus.

[0092] The battery monitoring device is triggered to disconnect at least one battery energy storage device from the DC bus.

[0093] In this embodiment, the system can intelligently determine battery power levels during peak electricity consumption periods and adopt corresponding power supply strategies. When the power levels of each battery storage device fall below the preset battery protection threshold, the system enters a flat power mode, supplying power according to the load's power consumption. Specifically, the load voltage is used as the DC bus voltage, and the grid-side energy storage converter is triggered to input the mains power into the DC bus after conversion to meet load demands. This operation ensures stable power supply to the load even when battery power is insufficient, while preventing excessive battery discharge and thus protecting battery life. Simultaneously, the connection between the battery storage device and the DC bus is automatically disconnected, preventing battery over-discharge and ensuring the safety and long lifespan of the energy storage device. This strategy not only optimizes battery use and protection but also ensures efficient power supply during periods of high electricity prices, significantly improving energy management efficiency and system operational safety.

[0094] In one embodiment of this application, the energy management device is further configured to:

[0095] When the current time point is in the off-peak electricity consumption period, determine the preset charging voltage corresponding to the off-peak electricity consumption period, and use the preset charging voltage as the DC bus voltage. The output power corresponding to the preset charging voltage is not less than the sum of the power of at least one battery energy storage device during charging and the power consumption of the load.

[0096] The grid-side energy storage converter is triggered to convert the AC power input from the mains into DC power based on the DC bus voltage and input it into the DC bus.

[0097] The battery monitoring device is triggered to connect the input of at least one battery energy storage device to the DC bus to charge the battery energy storage device via the DC bus.

[0098] In this embodiment, during off-peak hours, the energy management device automatically adjusts the DC bus voltage according to a preset charging voltage to ensure its output power is sufficient to meet the charging needs of the battery storage device and the power consumption of the load. This configuration ensures that the load's power demand is stably met while simultaneously charging the battery. By triggering the grid-side energy storage converter, the mains power is converted into DC power and input to the DC bus to charge the battery storage device. Simultaneously, the battery monitoring device automatically connects the battery storage device to the DC bus for charging. This charging method maximizes the use of low-cost electricity during off-peak hours, reduces power consumption costs, and effectively improves the charging efficiency of the battery storage device. It ensures an optimal balance between battery charging and load power supply, further enhancing the overall economy and stability of energy management.

[0099] In one embodiment of this application, the battery monitoring device is configured to switch the battery storage device to float charging state and the charging power is zero when the battery storage device is detected to have reached a preset full charge threshold in the status information of the battery storage device after the energy management device is triggered to indicate that the battery storage device is being charged.

[0100] In this embodiment, when the energy management device detects that the battery storage device's charge has reached a preset full-charge threshold, it promptly switches the storage device to float charging mode, at which point the charging power is zero to prevent overcharging. This operation effectively improves the charging safety of the battery storage device, preventing battery performance degradation or even safety hazards caused by overcharging, and significantly extending battery life. Simultaneously, automatically switching the storage device to float charging mode simplifies the system management process, reduces the need for manual intervention, and ensures the intelligence and efficiency of the charging process, thereby significantly improving the operational reliability and maintenance convenience of the online UPS control system for energy storage.

[0101] In one embodiment of this application, the energy management device is further configured to:

[0102] When the current time point is within the normal power consumption period, the load voltage is used as the DC bus voltage;

[0103] The grid-side energy storage converter is triggered to convert the AC power input from the mains into DC power based on the DC bus voltage and input it into the DC bus;

[0104] The battery monitoring device is triggered to disconnect the connection between the at least one battery energy storage device and the DC bus.

[0105] In this embodiment, during periods of normal power consumption, the grid-side energy storage converter can convert the AC power input from the mains into DC power and input it to the DC bus based on the DC bus voltage, thereby stabilizing the power supply from the grid. Furthermore, by triggering a battery monitoring device to disconnect at least one battery energy storage device from the DC bus, unnecessary battery energy storage device involvement is avoided, reducing energy waste and the burden on the energy storage devices. This helps to effectively reduce the energy loss of battery energy storage devices, improve their lifespan, and ensure that the power demand of the load is met.

[0106] In one embodiment of this application, the battery monitoring device is configured as follows:

[0107] A: Determine whether each parameter in the collected status information is within the safety threshold range used to characterize the battery status safety. If yes, proceed to step E; otherwise, proceed to step B.

[0108] B: Determine whether the parameter that is not within the safety threshold range is within the alarm threshold range used to characterize abnormal battery status. If yes, proceed to step C; otherwise, proceed to step D.

[0109] C: Disconnect at least one battery storage device from the DC bus;

[0110] D: Transmit critical safety signals to the energy management device to characterize battery anomalies;

[0111] E: Performs periodic collection of status information of each cell in the battery energy storage device;

[0112] The energy management device is also configured to control both the grid-side energy storage converter and the load-side energy storage converter to enter a standby state when a major safety signal is received, and to output alarm information containing status information. The alarm information can be output in at least one of the following ways: SMS push, email push, voice call notification, and platform system message push.

[0113] In this embodiment, the battery monitoring device ensures that the battery energy storage device operates within a safe threshold range by real-time monitoring and analysis of battery status information. Once an abnormal battery status is detected, the system triggers an alarm mechanism to promptly disconnect the battery energy storage device from the DC bus, thereby preventing battery damage or safety accidents. If a major safety hazard occurs, the battery monitoring device sends a critical safety signal to the energy management device, indicating a major safety accident. The energy management device then controls the grid-side and load-side energy storage converters to enter standby mode to ensure system safety. Simultaneously, the energy management device pushes alarm information via SMS, email, voice calls, and other means to notify maintenance personnel in real time. This intelligent monitoring and alarm mechanism greatly improves the safety of the battery energy storage system, avoids system failures or losses caused by abnormal battery status, and enhances the overall safety, reliability, and user experience of the energy management device.

[0114] In one embodiment of this application, the energy management device is further configured to analyze the received status information to obtain analysis results and output the analysis results.

[0115] In this embodiment, the energy management device has the function of intelligently analyzing the received battery status information and outputting the analysis results. This enables a comprehensive and timely assessment of the battery's operating status, helping users and maintenance personnel to intuitively grasp the battery's health status, performance trends, and potential faults. This facilitates proactive maintenance measures or optimized operating strategies, effectively improving the initiative and scientific nature of energy management. Simultaneously, the output analysis results provide strong data support for subsequent scheduling decisions and remote management, significantly enhancing the operational efficiency and safety assurance capabilities of the online UPS control system for energy storage.

[0116] In one embodiment of this application, each battery energy storage device consists of at least two cells connected in series and / or in parallel.

[0117] In this embodiment, the battery energy storage device is designed with series and parallel connections of battery cells, allowing for flexible adjustment of the battery pack's capacity and voltage characteristics according to actual needs. The series configuration improves the battery pack's voltage output, adapting to high-voltage requirements, while the parallel configuration enhances the battery pack's capacity and discharge capability, meeting high-power energy storage demands. This design not only enhances the system's flexibility and adaptability but also effectively mitigates the potential failure risks of individual cells, improving system stability and reliability. The configuration of multiple cells effectively disperses the failure risks of individual cells; even if a single cell fails, the online UPS control system for energy storage can still maintain high operational reliability. This combination not only improves the overall safety, stability, and availability of the battery energy storage device but also extends the equipment's lifespan and reduces the risk of system downtime due to a single cell failure.

[0118] In one embodiment of this application, the energy storage online UPS control system further includes at least one energy storage cabinet and at least one sensor;

[0119] Each energy storage cabinet is equipped with at least one sensor, at least one battery energy storage device, and a battery monitoring device corresponding to the battery energy storage device.

[0120] The sensor is configured to detect environmental parameters within the energy storage cabinet and transmit the environmental parameters to a battery monitoring device located in the same energy storage cabinet as the sensor. The environmental parameters include at least one of temperature, humidity, and the concentration of at least one gas.

[0121] The battery monitoring device is also configured to transmit environmental parameters to the energy management device; when it is determined that the environmental parameters are not within the environmental threshold range used to characterize the environmental safety inside the energy storage cabinet, disconnect at least one battery energy storage device from the DC bus and transmit an environmental abnormality signal to the energy management device.

[0122] The energy management device is also configured to receive environmental parameters. When an abnormal environmental signal is received, it controls both the grid-side energy storage converter and the load-side energy storage converter to enter a standby state and outputs alarm information containing environmental parameters.

[0123] In this embodiment, by integrating an energy storage cabinet, sensors, battery energy storage devices, and a battery monitoring device into the online UPS control system, comprehensive monitoring of the environment within the energy storage cabinet can be achieved. Sensors detect environmental parameters such as temperature, humidity, and gas concentration in real time and transmit the data to the battery monitoring device within the same energy storage cabinet. The battery monitoring device not only processes this environmental data but also transmits it to the energy management device. When environmental parameters exceed safe environmental thresholds, the battery monitoring device disconnects the battery energy storage device from the DC bus and sends an environmental anomaly signal. Upon receiving this signal, the energy management device automatically controls the grid-side and load-side energy storage converters to enter standby mode and promptly outputs alarm information containing environmental parameters. This effectively improves the response capability to abnormal environmental changes, ensuring timely protection of the battery energy storage device in unsafe environments and preventing equipment failure or safety accidents caused by environmental issues.

[0124] In one embodiment of this application, the energy management device is configured to perform the following when the mains power is abnormal:

[0125] The output includes alarm information about mains power anomalies and controls the grid-side energy storage converter to enter standby mode.

[0126] The load voltage is used as the DC bus voltage, and the battery monitoring device is triggered to execute the DC bus voltage-based control of the battery energy storage device to input DC power to the DC bus.

[0127] When the status information indicates that the battery power of the at least one battery energy storage device is not higher than a preset battery protection threshold, an alarm message containing the message that the battery power of the at least one battery energy storage device is not higher than the battery protection threshold is output.

[0128] In this embodiment, the energy management device can promptly detect and output alarm information indicating mains power anomalies, alerting relevant personnel to the power system's operational status. This process, through control based on the DC bus voltage, ensures the smooth switching of the grid-side energy storage converter to standby mode. Simultaneously, it triggers the execution of the battery monitoring device, ensuring the load voltage is used as the DC bus voltage and promptly controlling the battery energy storage device to input DC power to the DC bus, guaranteeing continuous power supply to the load. Simultaneously, it outputs alarm information indicating the battery energy storage device's battery charge is not higher than the battery protection threshold, facilitating maintenance personnel's understanding of the battery discharge status. This operation effectively enhances the system's emergency response capability in the event of mains power anomalies, ensuring the stability and reliability of the load's power supply. Through this intelligent control mechanism, not only can the continuity and security of power supply be improved, but automated energy switching can also be achieved in emergencies, minimizing system downtime and improving overall system stability and operational efficiency, thereby reducing operational risks and maintenance costs caused by mains power anomalies.

[0129] In one embodiment of this application, the energy storage online UPS control system further includes a load meter;

[0130] The load meter is configured to collect the first electrical data output from the load-side energy storage converter to the load and transmit the first electrical data to the energy management device.

[0131] An energy management device is configured to receive first power data and output first power data.

[0132] In this embodiment, by configuring a load meter, the first power data from the output of the load-side energy storage converter to the load can be collected in real time and transmitted to the energy management device. Upon receiving the data, the energy management device can accurately monitor the load's power usage and provide detailed power data analysis. This operation facilitates precise understanding of the load's power consumption, helps users understand energy consumption trends, optimize power use, and perform reasonable scheduling, thereby enhancing the transparency of energy use.

[0133] In one embodiment of this application, the energy storage online UPS control system further includes a power grid meter;

[0134] The grid meter is configured to collect the second electrical data input from the mains input terminal to the DC bus and transmit the second electrical data to the energy management device.

[0135] The energy management device is configured to receive second power data and output second power data.

[0136] In this embodiment, by configuring a grid meter, the second electrical quantity data input from the mains input terminal to the DC bus can be collected in real time and accurately transmitted to the energy management device. Upon receiving the second electrical quantity data, the energy management device can monitor and output real-time mains input energy consumption, providing managers with detailed electricity usage information. This operation not only improves the visualization of mains current flow and helps analyze the relationship between mains input and overall energy consumption, but also provides a reliable data foundation for subsequent energy efficiency management and operational optimization.

[0137] In one embodiment of this application, the energy storage online UPS control system further includes an energy storage meter;

[0138] An energy storage meter is configured to collect third energy data output from the output terminal of at least one battery energy storage device and transmit the third energy data to an energy management device.

[0139] The energy management device is configured to receive third-party electrical data and output third-party electrical data.

[0140] In this embodiment, by adding an energy storage meter, the third-level electrical data at the output of each battery energy storage device can be accurately collected and transmitted to the energy management device. After receiving and outputting the third-level electrical data, the energy management device can comprehensively grasp the operating status and electrical output of each energy storage device, thereby achieving refined management of the energy storage unit. This design can not only effectively assess the health status and utilization efficiency of the energy storage devices and promptly detect anomalies and perform maintenance, but also provide a reliable basis for energy scheduling and load allocation.

[0141] like Figure 2 As shown, to more clearly illustrate the technical solution and advantages of this application, the following uses battery energy storage device a, battery energy storage device b, battery monitoring device a, battery monitoring device b, sensor a, sensor b, energy storage cabinet a, and energy storage cabinet b as examples to provide a detailed description of an online UPS control system for energy storage provided in this application embodiment, specifically including:

[0142] The energy storage online UPS control system includes: energy management device 201, grid-side energy storage converter 202, load-side energy storage converter 203, battery monitoring device a204, battery monitoring device b205, battery energy storage device a206, battery energy storage device b207, sensor a208, sensor b209, energy storage cabinet a210, energy storage cabinet b211, load meter 212, grid meter 213, and energy storage meter 214.

[0143] The battery energy storage device a206, the battery monitoring device a204, and the sensor a208 are installed in the energy storage cabinet a210.

[0144] The battery energy storage device b207, the battery monitoring device b205, and the sensor b209 are installed in the energy storage cabinet b211.

[0145] The battery monitoring device a204 is configured to collect the status information of each cell in the battery energy storage device a206 and transmit it to the energy management device 201.

[0146] The battery monitoring device b205 is configured to collect the status information of each cell in the battery energy storage device b207 and transmit it to the energy management device 201.

[0147] Taking the status information recognition of battery monitoring device A204 as an example

[0148] Battery monitoring device A204 is configured as follows:

[0149] A: Determine whether each parameter in the collected status information is within the safety threshold range used to characterize the battery status safety. If yes, proceed to step E; otherwise, proceed to step B.

[0150] B: Determine whether the parameter that is not within the safety threshold range is within the alarm threshold range used to characterize abnormal battery status. If yes, proceed to step C; otherwise, proceed to step D.

[0151] C: Disconnect the battery energy storage device a from the DC bus;

[0152] D: Transmit a critical safety signal to the energy management device 201 to characterize battery abnormalities;

[0153] E: Performs periodic collection of status information of each cell in the battery energy storage device;

[0154] Energy management device 201 is configured to receive status information transmitted by each battery monitoring device a and b. When a critical safety signal is received, both grid-side energy storage converter 202 and load-side energy storage converter 203 are controlled to enter standby mode and output alarm information containing status information. The alarm information is output in at least one of the following methods: SMS push, email push, voice telephone notification, and platform system message push.

[0155] Specifically, the online UPS control system for energy storage is equipped with battery monitoring device a and battery monitoring device b, which can collect the status information of the cells in each battery energy storage device a and b in real time and transmit this data to the energy management device. After receiving the status information from the different battery monitoring devices, the energy management device can comprehensively and accurately monitor the operating status of the battery energy storage devices and promptly identify potential battery faults or performance degradation. This facilitates precise maintenance and troubleshooting for users, extends battery life, optimizes battery charging and discharging strategies, and avoids excessive consumption or damage. Through continuous monitoring of the cell status, the reliability and safety of the system are effectively improved, while enabling more efficient energy management and scheduling, further reducing operating costs and improving the overall energy efficiency of the system.

[0156] In addition, the battery monitoring device ensures the battery is in a safe operating state by monitoring various parameters of the battery energy storage device in real time. When the battery status information exceeds the safety threshold range, the battery monitoring device will detect it promptly and take corresponding measures according to different degrees of abnormality. If the parameters are within the alarm threshold range, the battery monitoring device will disconnect the battery energy storage device from the DC bus to prevent more serious faults caused by over-discharge or damage to the battery. If the parameters exceed the alarm threshold range, the battery monitoring device will also send a critical safety signal to the energy management device, activate emergency response measures, and control the grid-side and load-side energy storage converters to enter standby mode, thereby protecting the safe operation of the system.

[0157] This monitoring mechanism enables immediate response to battery anomalies, reducing potential safety hazards. Furthermore, upon receiving critical safety signals, the energy management device can rapidly output alarm information via various means, including SMS push notifications, email alerts, voice calls, and platform system messages, ensuring relevant personnel are promptly informed of fault information and can take action, further enhancing system security and maintainability. This efficient fault detection and alarm mechanism not only improves system reliability but also provides users with a higher level of intelligent management, ensuring the stability and safety of the battery energy storage system during long-term operation.

[0158] It should be noted that the battery monitoring device and the battery energy storage device can have a one-to-one relationship or a one-to-many relationship.

[0159] There are two states in a power grid: one is normal power supply, and the other is abnormal power supply.

[0160] 1. When the mains power can provide stable AC power, it is divided into peak power discharge mode during peak power consumption period, flat power mode during flat power consumption period, and off-peak power charging mode during off-peak power consumption period.

[0161] (1) Peak discharge mode

[0162] Energy management device 201 is configured as follows:

[0163] When the mains provides a stable AC power supply and the current time is during the peak power consumption period, the load voltage is used as the DC bus voltage.

[0164] When the status information indicates that the battery capacity of battery energy storage devices a206 and b207 is higher than the preset battery protection threshold, the grid-side energy storage converter 202 is triggered to enter standby mode based on the DC bus voltage, and the battery monitoring device a204 is triggered to control battery energy storage device a206 to input DC power to the DC bus; the battery monitoring device b205 is triggered to control battery energy storage device b207 to input DC power to the DC bus; and the load energy storage converter is triggered.

[0165] The load-side energy storage converter 203 is configured to convert the DC power from the DC bus to AC power based on the load voltage and output it to the load.

[0166] Specifically, the peak discharge mode precisely controls the charging and discharging behavior of the battery energy storage device. When the mains provides stable AC power and it is during peak electricity demand periods, it fully utilizes the battery's energy storage capacity, reducing grid load and optimizing power efficiency. In this mode, when the battery's charge level exceeds a preset protection threshold, the battery monitoring device automatically connects the battery to the DC bus, supplying power to the DC bus and reducing dependence on the grid. Simultaneously, the load-side energy storage converter converts DC to AC, ensuring a stable supply to the load's power needs. This mode not only effectively prevents over-discharge of the battery and extends its lifespan but also provides reliable power support during peak electricity demand periods, improving the economy and environmental friendliness of energy use.

[0167] (2) Leveling mode - Case 1

[0168] Energy management device 201 is configured as follows:

[0169] When the mains provides stable AC power and the current time is during peak power consumption, and the status information indicates that the battery capacity of both battery energy storage devices a206 and b207 is not higher than the battery protection threshold, the load voltage is used as the DC bus voltage; the grid-side energy storage converter 202 is triggered to convert the AC power input from the mains into DC power based on the DC bus voltage and input it to the DC bus; the battery monitoring device a204 is triggered to disconnect the battery energy storage device a206 from the DC bus, the battery monitoring device b205 is triggered to disconnect the battery energy storage device b207 from the DC bus, and the load energy storage converter is triggered.

[0170] The load-side energy storage converter 203 is configured to convert the DC power from the DC bus to AC power based on the load voltage and output it to the load.

[0171] Specifically, when the mains power supply is normal and it is during peak power consumption periods, and the battery energy storage device's power level is not higher than the battery protection threshold, the system will switch to the peak power mode. That is, the system automatically switches to a working mode that relies entirely on mains power supply. The grid-side energy storage converter efficiently converts the mains AC power into DC power to supply the DC bus, ensuring the continuous and stable operation of the load and effectively avoiding over-discharge of the battery energy storage device, thus extending the battery's lifespan.

[0172] (3) Leveling mode - second case

[0173] Energy management device 201 is also configured to:

[0174] When the current time point is within the normal power consumption period, the load voltage is used as the DC bus voltage;

[0175] The grid-side energy storage converter 202 is triggered to convert the AC power input from the mains into DC power based on the DC bus voltage and input it into the DC bus;

[0176] Trigger battery monitoring device a204 to disconnect battery energy storage device a206 from the DC bus; trigger battery monitoring device b205 to disconnect battery energy storage device b207 from the DC bus.

[0177] Specifically, when the current time falls within a normal power consumption period, the system will enter a normal power consumption mode, using the load voltage as the DC bus voltage. Based on this, the grid-side energy storage converter will convert the AC mains power into DC power and input it to the DC bus. Simultaneously, the battery monitoring device automatically disconnects the battery energy storage device from the DC bus, avoiding unnecessary battery discharge, reducing energy waste, and lowering the burden on the battery energy storage device. Furthermore, this mode optimizes energy utilization efficiency and improves the economy, reliability, and intelligence level of the energy management system.

[0178] (4) Off-peak electricity consumption mode

[0179] Energy management device 201 is configured as follows:

[0180] When the current time point falls within the off-peak electricity consumption period, determine the preset charging voltage corresponding to the off-peak electricity consumption period;

[0181] The preset charging voltage is used as the DC bus voltage, wherein the output power corresponding to the preset charging voltage is not less than the sum of the power of at least one battery energy storage device during charging and the power consumption of the load.

[0182] The grid-side energy storage converter 202 is triggered to convert the AC power input from the mains into DC power based on the DC bus voltage and input it into the DC bus.

[0183] The battery monitoring device a204 is triggered to connect the input terminal of the battery energy storage device a206 to the DC bus, and the battery monitoring device b205 is triggered to connect the input terminal of the battery energy storage device b207 to the DC bus, so as to charge the battery energy storage devices a206 and b through the DC bus.

[0184] The battery monitoring device a204 is configured to switch the battery energy storage device a206 to float charging state and set the charging power to zero when the battery energy storage device a206 is detected to have reached a preset full charge threshold in the status information.

[0185] The battery monitoring device b205 is configured to switch the battery energy storage device 207 to float charging state and the charging power is zero when the battery energy storage device a206 is detected to have reached a preset full charge threshold in the status information.

[0186] The load-side energy storage converter 203 is configured to convert the DC power from the DC bus to AC power based on the load voltage and output it to the load.

[0187] Specifically, the energy management device intelligently adjusts the charging strategy during off-peak electricity hours to achieve efficient charging of the battery storage device and optimize power usage. During off-peak hours, the energy management device ensures that the output power can cover the power demand of battery charging and loads based on a preset charging voltage, thereby making full use of off-peak electricity prices for charging and reducing energy costs. By converting mains power to DC power and inputting it into the DC bus, the battery storage device can be charged efficiently while ensuring that the battery is not overcharged during the charging process.

[0188] The battery monitoring device detects the battery level in real time. When the battery energy storage device reaches the preset full charge threshold, it puts the battery energy storage device into float charging mode to avoid overcharging and protect the battery's lifespan.

[0189] In addition, the load-side energy storage converter can convert DC power to AC power based on the load voltage, ensuring the stable operation of the load.

[0190] 2. When the mains power is abnormal.

[0191] When the mains power is abnormal, the energy management device 201 is configured as follows:

[0192] The output includes alarm information for mains power anomalies and controls the grid-side energy storage converter 202 to enter standby mode.

[0193] The load voltage is used as the DC bus voltage, and the battery monitoring device a204 is triggered to execute the control of the battery energy storage device a206 to input DC power to the DC bus based on the DC bus voltage, and the battery monitoring device b205 is triggered to execute the control of the battery energy storage device a207 to input DC power to the DC bus based on the DC bus voltage.

[0194] When the status information indicates that the battery capacity of both battery energy storage devices a and b is not higher than the preset battery protection threshold, an alarm message containing the message that the battery capacity of both battery energy storage devices a and b is not higher than the battery protection threshold is output.

[0195] Specifically, when the mains power is abnormal, the energy management device can promptly output alarm information including the mains power anomaly and automatically control the grid-side energy storage converter to enter standby mode. Simultaneously, it uses the load voltage as the DC bus voltage, triggering the battery monitoring device to promptly control the battery energy storage devices to input DC power to the DC bus based on the DC bus voltage status, ensuring continuous power supply to the load. It also alerts maintenance personnel that the charge level of each battery energy storage device does not exceed the battery protection threshold, allowing them to assess how long the battery energy storage devices can still supply power to the load and take timely appropriate measures. This operation enables rapid response to mains power anomalies and automatic switching to energy storage power, effectively improving system reliability and power supply continuity, preventing load power outages due to mains power anomalies, and ensuring the normal operation of user equipment.

[0196] Taking sensor A208 as an example:

[0197] Sensor a208 is configured to detect environmental parameters within energy storage cabinet a201 and transmit the environmental parameters to battery monitoring device a204 located in the same energy storage cabinet as the sensor. The environmental parameters include at least one of temperature, humidity, and concentration of at least one gas.

[0198] The battery monitoring device a204 is also configured to transmit environmental parameters to the energy management device 201; when it is determined that the environmental parameters are not within the environmental threshold range used to characterize the environmental safety inside the energy storage cabinet, disconnect at least one battery energy storage device a207 from the DC bus and transmit an environmental abnormality signal to the energy management device 201.

[0199] The energy management device 201 is also configured to receive environmental parameters. When an abnormal environmental signal is received, it controls both the grid-side energy storage converter 202 and the load-side energy storage converter 203 to enter a standby state and output alarm information containing environmental parameters.

[0200] Specifically, by using sensors to monitor environmental parameters such as temperature, humidity, and gas concentration in real time, the operating environment of the energy storage device can be promptly assessed. The sensors transmit data to the battery monitoring device, which then transmits it to the energy management device. When environmental parameters are abnormal, the battery monitoring device automatically disconnects the energy storage device from the DC bus to prevent damage to the battery from unsafe conditions, and simultaneously sends an environmental anomaly signal to the energy management device. Upon receiving the anomaly signal, the energy management device controls the energy storage converters on both the grid and load sides to enter standby mode and issues alarm information containing environmental parameters. This operation enhances the response capability to environmental anomalies, ensures timely protection of the energy storage device in unsafe environments, avoids equipment failures or safety accidents, and improves the system's safety, stability, and reliability.

[0201] Understandably, the types of gases include, but are not limited to, carbon monoxide, volatile organic compounds (VOCs), hydrogen, and carbon dioxide.

[0202] The load meter 212 is configured to collect the first power data output from the output terminal of the load-side energy storage converter 203 to the load, and transmit the first power data to the energy management device.

[0203] The grid meter 213 is configured to collect the second electrical data input from the mains input terminal to the DC bus and transmit the second electrical data to the energy management device.

[0204] The energy storage meter 214 is configured to collect third energy data output from the output terminal of at least one battery energy storage device and transmit the third energy data to the energy management device.

[0205] The energy management device 201 is configured to receive first power data, second power data, and third power data, and to output the first power data, second power data, and third power data.

[0206] By setting up load meters, grid meters, and energy storage meters, precise monitoring of various key power data is possible. Load meters collect real-time power data from the load-side energy storage converter output to the load and transmit it to the energy management device; grid meters collect power data from the mains input to the DC bus; and energy storage meters collect power data from the battery energy storage device output. This real-time transmission and centralized processing of power data allows the energy management device to comprehensively understand the system's power usage. After receiving and integrating this data, the energy management device provides operators with accurate power monitoring information, ensuring efficient system operation. Collecting relevant data from various meters not only improves the efficiency of power resource utilization but also provides accurate data support for energy dispatch and optimization management.

[0207] The energy management device 201 is also configured to analyze the received status information, environmental parameters, first power data, second power data, and third power data to obtain analysis results and output the analysis results.

[0208] Specifically, the energy management device comprehensively analyzes received status information, environmental parameters, and power consumption data to achieve precise monitoring and optimized management of the battery energy storage system and load power consumption. In particular, the energy management device integrates multiple data sources, such as battery status information, environmental changes (e.g., temperature, humidity), and battery charge / discharge data (first, second, and third power consumption data). By analyzing this data, it can comprehensively assess the current system operating status and energy demand.

[0209] The analysis results can help the system adjust its charging and discharging strategies in a timely manner to optimize energy use. For example, under different environmental conditions (such as when the battery charging and discharging efficiency decreases due to excessively high temperatures), the system can automatically adjust the battery's charging voltage, charging time, or switch energy sources to ensure the battery's optimal operating state. Simultaneously, through in-depth analysis of power data, the energy management device can predict the battery's remaining capacity and load demand, responding in advance to avoid over-discharging or over-charging, thus ensuring the system's safety and efficiency.

[0210] It should be noted that the battery monitoring device can also be manually powered on / off. When the battery monitoring device is manually powered on / off, the energy management device will detect the status information of the battery monitoring device and update that information.

[0211] like Figure 3 As shown, this application provides a control method for an online UPS control system for energy storage, including:

[0212] Step 301: Periodically collect the status information of each cell in the battery energy storage device using the battery monitoring device and transmit it to the energy management device.

[0213] Step 302: Receive status information transmitted by the battery monitoring device using the energy management device; when the mains power provides stable AC power, determine the DC bus voltage based on the status information and the current time point, and trigger the grid-side energy storage converter and battery monitoring device based on the DC bus voltage, and trigger the load energy storage converter.

[0214] Step 303: When the grid-side energy storage converter is triggered by the energy management device to indicate the cessation of converting AC power input from the mains to DC power input to the DC bus, it enters standby mode;

[0215] Step 304: When the energy management device is triggered by the battery monitoring device to indicate that power is being supplied to the load, the preset load voltage is used as the DC bus voltage and the battery energy storage device is controlled to input DC power to the DC bus.

[0216] Step 305: After the load-side energy storage converter is triggered, the DC power on the DC bus is converted into AC power based on the load voltage and output to the load.

[0217] In this embodiment, the proposed online UPS control system with energy storage effectively solves the problems of low energy efficiency, serious energy waste, and insufficient battery management in existing UPS systems by introducing the collaborative operation of an intelligent energy management device, a battery energy storage device, and a battery monitoring device. Specifically, the energy management device can precisely adjust the DC bus voltage based on real-time battery status information and the current time, and trigger the standby mode of the grid-side energy storage converter as needed, achieving flexible control of power consumption at different times, ensuring stable power supply and reducing electricity costs. Simultaneously, the battery monitoring device periodically collects the status information of each cell in the battery energy storage device, achieving refined battery management, timely detection of battery anomalies, and prevention of overcharging and over-discharging, thereby extending battery life and improving safety. Furthermore, when the mains power supply is stable, the grid-side energy storage converter enters standby mode, reducing the system's operational burden; the load-side energy storage converter always precisely adjusts and outputs stable AC power according to the preset load voltage, ensuring continuous operation of the load equipment.

[0218] Those skilled in the art will recognize that the units and method steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for specific applications, but such implementations should not be considered beyond the scope of the embodiments of this application.

[0219] The above embodiments are only used to illustrate the embodiments of this application, and are not intended to limit the embodiments of this application. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of this application. Therefore, all equivalent technical solutions also fall within the scope of the embodiments of this application, and the patent protection scope of the embodiments of this application should be defined by the claims.

Claims

1. An online UPS control system for energy storage, characterized in that, include: Energy management device, grid-side energy storage converter, load-side energy storage converter, at least one battery energy storage device, and at least one battery monitoring device; The energy management device is configured to receive the status information transmitted by the battery monitoring device; when the mains power provides stable AC power, it determines the DC bus voltage based on the status information and the current time point, and triggers the grid-side energy storage converter and the battery monitoring device based on the DC bus voltage, and also triggers the load energy storage converter. The grid-side energy storage converter is configured to enter a standby state when the energy management device triggers a signal indicating the cessation of converting AC mains input into DC input to the DC bus. The battery monitoring device is configured to periodically collect the status information of each cell in the battery energy storage device and transmit it to the energy management device. When the energy management device is triggered to indicate that power is being supplied to the load, the preset load voltage is used as the DC bus voltage and the battery energy storage device is controlled to input DC power to the DC bus. The load-side energy storage converter is configured to, upon being triggered, convert the DC power from the DC bus into AC power based on the load voltage and output it to the load.

2. The energy storage online UPS control system according to claim 1, characterized in that, The energy management device is configured as follows: When the mains provides a stable AC power supply and the current time is during the peak power consumption period, the load voltage is used as the DC bus voltage. When it is determined that the status information indicates that the battery power of the at least one battery energy storage device is higher than a preset battery protection threshold, the grid-side energy storage converter is triggered to enter a standby state based on the DC bus voltage, and the battery monitoring device is triggered to control the battery energy storage device to input DC power to the DC bus.

3. The energy storage online UPS control system according to claim 2, characterized in that, The energy management device is configured as follows: When the current time point is during the peak power consumption period, and the status information indicates that the battery capacity of the at least one battery energy storage device is not higher than the battery protection threshold, the load voltage is used as the DC bus voltage. The grid-side energy storage converter is triggered to convert the AC power input from the mains into DC power based on the DC bus voltage and input it into the DC bus. The battery monitoring device is triggered to disconnect the at least one battery energy storage device from the DC bus.

4. The energy storage online UPS control system according to claim 1, characterized in that, The energy management device is further configured to: When the current time point is in the off-peak electricity consumption period, a preset charging voltage corresponding to the off-peak electricity consumption period is determined, and the preset charging voltage is used as the DC bus voltage. The output power corresponding to the preset charging voltage is not less than the sum of the power of the at least one battery energy storage device during charging and the power consumption of the load. The grid-side energy storage converter is triggered to convert the AC power input from the mains into DC power based on the DC bus voltage and input it into the DC bus. The battery monitoring device is triggered to connect the input terminal of the at least one battery energy storage device to the DC bus, so as to charge the battery energy storage device through the DC bus.

5. The energy storage online UPS control system according to claim 4, characterized in that, The battery monitoring device is configured to switch the battery storage device to float charging state and set the charging power to zero after the energy management device is triggered to indicate that the battery storage device is being charged.

6. The energy storage online UPS control system according to claim 1, characterized in that, The energy management device is further configured to: When the current time point is within the normal power consumption period, the load voltage is used as the DC bus voltage; The grid-side energy storage converter is triggered to convert the AC power input from the mains into DC power based on the DC bus voltage and input it into the DC bus; The battery monitoring device is triggered to disconnect the connection between the at least one battery energy storage device and the DC bus. And / or, The battery monitoring device is configured as follows: A: Determine whether each parameter in the collected status information is within the safety threshold range used to characterize the battery status safety. If yes, proceed to step E; otherwise, proceed to step B. B: Determine whether the parameter that is not within the safety threshold range is within the alarm threshold range used to characterize abnormal battery status. If yes, proceed to step C; otherwise, proceed to step D. C: Disconnect the at least one battery energy storage device from the DC bus; D: Transmit a critical safety signal to the energy management device to characterize a battery malfunction; E: Perform the periodic acquisition of status information of each cell in the battery energy storage device; The energy management device is further configured to, upon receiving the critical safety signal, control both the grid-side energy storage converter and the load-side energy storage converter to enter a standby state and output alarm information containing the status information, wherein the output method of the alarm information includes at least one of SMS push, email push, voice call notification and platform system message push.

7. The energy storage online UPS control system according to claim 1, characterized in that, The energy management device is further configured to analyze the received status information to obtain analysis results and output the analysis results; And / or, Each of the battery energy storage devices consists of at least three cells connected in series and / or in parallel.

8. The energy storage online UPS control system according to claim 1, characterized in that, The energy storage online UPS control system also includes at least one energy storage cabinet and at least one sensor; Each of the energy storage cabinets is equipped with at least one sensor, at least one of the battery energy storage devices, and a battery monitoring device corresponding to the battery energy storage device; The sensor is configured to detect environmental parameters within the energy storage cabinet and transmit the environmental parameters to the battery monitoring device located in the same energy storage cabinet as the sensor. The environmental parameters include at least one of temperature, humidity, and the concentration of at least one gas. The battery monitoring device is also configured to transmit the environmental parameters to the energy management device; when it is determined that the environmental parameters are not within the environmental threshold range used to characterize the environmental safety inside the energy storage cabinet, disconnect the connection between the at least one battery energy storage device and the DC bus, and transmit an environmental abnormality signal to the energy management device. The energy management device is also configured to receive the environmental parameters, and when it receives the environmental abnormality signal, to control both the grid-side energy storage converter and the load-side energy storage converter to enter a standby state and output alarm information containing the environmental parameters.

9. The energy storage online UPS control system according to any one of claims 1 to 8, characterized in that, The energy management device is configured to perform the following when the mains power is abnormal: The system outputs alarm information indicating a mains power anomaly and controls the grid-side energy storage converter to enter standby mode. The load voltage is used as the DC bus voltage, and the battery monitoring device is triggered to execute and control the battery energy storage device to input DC power to the DC bus based on the DC bus voltage. When the status information indicates that the battery power of the at least one battery energy storage device is not higher than the preset battery protection threshold, an alarm message containing the battery power of the at least one battery energy storage device is not higher than the battery protection threshold is output. And / or, The energy storage online UPS control system also includes a load meter; The load meter is configured to collect the first power data output from the load-side energy storage converter to the load, and transmit the first power data to the energy management device. The energy management device is configured to receive the first power data and output the first power data; And / or, The energy storage online UPS control system also includes a power grid meter; The power grid meter is configured to collect second power data input from the mains power input terminal to the DC bus, and transmit the second power data to the energy management device. The energy management device is configured to receive the second power data and output the second power data; And / or, The energy storage online UPS control system also includes an energy storage meter; The energy storage meter is configured to collect third energy data output from the output terminal of the at least one battery energy storage device and transmit the third energy data to the energy management device. The energy management device is configured to receive the third power data and output the third power data.

10. A control method for an online UPS control system for energy storage as described in any one of claims 1 to 9, characterized in that, include: The battery monitoring device periodically collects the status information of each cell in the battery energy storage device and transmits it to the energy management device. The energy management device receives the status information transmitted by the battery monitoring device; when the mains power provides stable AC power, the DC bus voltage is determined based on the status information and the current time point, and the grid-side energy storage converter and battery monitoring device are triggered based on the DC bus voltage, and the load energy storage converter is also triggered. When the grid-side energy storage converter is triggered by the energy management device to indicate the cessation of converting AC power input from the mains to DC power input to the DC bus, it enters a standby state. When the battery monitoring device is triggered by the energy management device to indicate that power is being supplied to the load, the preset load voltage is used as the DC bus voltage and the battery energy storage device is controlled to input DC power to the DC bus. After the load-side energy storage converter is triggered, it converts the DC power from the DC bus into AC power based on the load voltage and outputs it to the load.

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