Energy storage system controls dual power supply system

Abstract

The utility model relates to a kind of energy storage system control dual power supply system, including main power circuit, standby power circuit, power conversion switch and host computer;Main power circuit includes sequentially connected UPS power supply and AC / DC switching power supply, and UPS power supply is connected with external commercial ac power supply;Standby power circuit includes sequentially connected energy storage battery pack and DC / DC conversion module, and energy storage battery pack is connected with battery pack acquisition module, and battery pack acquisition module is connected with host computer;The input end of power conversion switch is connected with AC / DC switching power supply and DC / DC conversion module, and the output end of power conversion switch is connected with external load;Host computer is connected with UPS power supply and energy storage battery pack respectively.The utility model realizes remote monitoring and active protection of main and standby power supply, intelligent switching, continuously provides the stable control power supply required by various working conditions energy storage system, improves the reliability of energy storage system operation.

Description

Technical Field

[0001] This utility model relates to a dual-power supply system for controlling an energy storage system, and belongs to the field of energy storage technology. Background Technology

[0002] In energy storage control systems, the control equipment with the battery management system at its core undertakes key functions such as starting and stopping the energy storage system, status monitoring, charging and discharging protection, equalization control, and fault protection. Its power supply stability is directly related to the safety and reliability of the entire energy storage system.

[0003] Existing energy storage control systems mostly use a single power supply. Once this power supply fails, the control system will shut down and will be unable to perform protection actions or complete data storage. Some solutions use a single power supply architecture equipped with a UPS, but the backup power supply time of the UPS with built-in battery is short, usually only 5 to 15 minutes. Even with an external battery, the backup time can generally only be extended to 0.5 to 2 hours. When the UPS battery is depleted, the system will still lose output and cannot meet the requirements of long-term continuous operation of the energy storage system.

[0004] To address these issues, some solutions employ dual-power switching devices, using mechanical or static switches to achieve redundant switching. However, these devices rely on relay mechanical action control and lack intelligent judgment, making them unsuitable for scenarios requiring high control precision and remote monitoring. Therefore, improvements are urgently needed. Utility Model Content

[0005] To overcome the shortcomings of existing energy storage control systems, such as insufficient reliability, low switching efficiency, and poor adaptability, this utility model designs a dual-power supply system for energy storage system control. It realizes remote monitoring and active protection and intelligent switching of main and backup power supplies, continuously providing stable control power required by energy storage systems under various operating conditions, thereby improving the reliability of energy storage system operation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A dual-power supply system for energy storage control includes a main power circuit, a backup power circuit, a power transfer switch, and a host unit. The main power circuit includes a UPS power supply and an AC / DC switching power supply connected in sequence, with the UPS power supply connected to an external AC mains power supply. The backup power circuit includes an energy storage battery pack and a DC / DC conversion module connected in sequence, with the energy storage battery pack connected to a battery acquisition module, which is connected to the host unit. The input terminal of the power transfer switch is connected to the AC / DC switching power supply and the DC / DC conversion module, and the output terminal of the power transfer switch is connected to an external load. The host unit is connected to both the UPS power supply and the energy storage battery pack.

[0007] Furthermore, the main unit is connected to the power transfer switch and the UPS power supply via RS485 interfaces.

[0008] Furthermore, the host unit is connected to the battery pack acquisition module via a CAN interface.

[0009] Furthermore, the main unit is connected to an energy management system via a LAN interface.

[0010] Furthermore, the main unit is connected to AC power via a hard-wired interface.

[0011] Compared with the prior art, this utility model has the following features and beneficial effects: This invention enables more precise power management and fault diagnosis by setting up a host, power conversion switch and UPS power supply, realizing remote monitoring and active protection and intelligent switching of main and backup power supplies, continuously providing stable control power required by energy storage systems under various working conditions, improving the reliability of energy storage system operation, and is suitable for scenarios with higher requirements for control precision and remote monitoring. Attached Figure Description

[0012] Figure 1 This is a connection diagram of this utility model.

[0013] The attached diagram is labeled as follows: 1. UPS power supply; 2. AC / DC switching power supply; 3. DC / DC conversion module; 4. Energy storage battery pack; 5. Battery pack acquisition module; 6. Main unit; 7. Power conversion switch; 8. Energy management system; 9. AC mains power supply; 10. Load; 20. Main power circuit; 30. Backup power circuit. Detailed Implementation

[0014] The present invention will now be described in more detail with reference to the embodiments.

[0015] like Figure 1 As shown, the energy storage system control dual power supply system of this embodiment includes a main power circuit 20, a backup power circuit 30, a power conversion switch 7, and a host 6. The main power supply circuit 20 includes a UPS power supply 1 and an AC / DC switching power supply 2 connected in sequence. The UPS power supply 1 is connected to an external AC mains power supply 9.

[0016] AC / DC switching power supply 2 is used to provide stable DC power to load 10 under normal operating conditions when AC power supply 9 is connected to the mains AC power supply 9. The main power supply circuit 20 outputs 220V AC power connected to the input terminal of UPS power supply 1 as 220V regulated AC power. By setting AC / DC switching power supply 2, the 220V AC power of UPS power supply 1 is converted into 24V DC power required by load 10.

[0017] The backup power circuit 30 includes an energy storage battery pack 4 and a DC / DC conversion module 3 connected in sequence. The energy storage battery pack 4 is connected to a battery acquisition module 5, and the battery acquisition module 5 is connected to the host 6. By setting up DC / DC conversion module 3, power is directly drawn from the high-voltage DC bus to convert the rated 1331.2V high-voltage DC output from the energy storage battery pack 4 into the 24V low-voltage DC required by the load 10. DC / DC conversion module 3 supports a wide input range of 300V-1500VDC to adapt to the voltage fluctuation conditions of the backup power circuit 30.

[0018] The input terminal of the power conversion switch 7 is connected to the AC / DC switching power supply 2 and the DC / DC conversion module 3, and the output terminal of the power conversion switch 7 is connected to the external load 10. The power transfer switch 7 is used to execute the switching command of the host 6 to connect the load 10 to the main power circuit 20 or the backup power circuit 30, so as to achieve seamless switching between the main and backup power supplies.

[0019] The power transfer switch 7 is equipped with a fast switching switch, supporting both manual and automatic switching. It has a fast switching response time and achieves seamless switching between the main power circuit 20 and the backup power circuit 30, which are protected by the UPS, through intelligent control. It provides dual bus power supply to the load 10 and has intelligent protection and alarm functions such as overvoltage, undervoltage protection and overload protection.

[0020] The host 6 is connected to the UPS power supply 1 and the energy storage battery pack 4 respectively. The host 6 is used to detect the input signals of the main power circuit 20 and the backup power circuit 30.

[0021] The host 6 uses a quad-core ARM Cortex-A55 processor to monitor the status of the main power circuit 20 and the backup power circuit 30 in real time, and monitors the voltage, current and temperature of the main and backup power outputs, the battery charge of UPS power supply 1, and DC bus voltage, insulation and other data; the host 6 is connected to the power conversion switch 7 through an RS485 interface to control the input or output of the dual power supply.

[0022] The main unit 6 and UPS power supply 1 are connected via an RS485 interface to realize automatic or manual switching control of the main and backup power supplies.

[0023] The host 6 is connected to the battery pack acquisition module 5 via the CAN interface. It calculates, analyzes and processes the real-time data of the energy storage battery pack 4, monitors the SOC (remaining battery capacity) and SOH (state of health) of the energy storage battery pack 4, calculates and analyzes the SOC / SOH and other states of the energy storage battery pack 4, intelligently adjusts charging and discharging, and cuts off the high-voltage output of the energy storage battery pack 4 according to fault information.

[0024] The battery pack acquisition module 5 is the core module of the energy storage battery management system. It communicates with the host 6 through the CAN communication interface and is mainly responsible for the voltage acquisition, current acquisition, and summarization of the voltage and temperature information of individual cells in the energy storage battery pack 4.

[0025] The host 6 is connected to the energy management system 8 via a LAN interface, enabling linkage control with the energy management system 8 through LAN communication, feeding back the real-time status to the energy management system 8, and receiving control commands issued by the energy management system 8 to achieve remote monitoring.

[0026] The host 6 is connected to the AC power supply 9 via a hard-wired interface to detect the input signal of the main power circuit 20.

[0027] The power transfer switch 7 enables remote monitoring and operation via an RS485 interface, completing multi-level linkage and collaborative control. Through the power switching control strategy of the host 6 and the energy management system 8, it ensures uninterrupted power supply to the load 10 and improves the reliability of power consumption in the energy storage system. The power transfer switch 7 communicates bidirectionally with the host 6, uploading power status signals to the host 6 and receiving control commands issued by the host 6 based on monitoring parameters to execute switching operations.

[0028] The working principle of this utility model is as follows: When the AC power supply 9 and the UPS power supply 1 are working normally, the load 10 is connected to the main power circuit 20, and the main power circuit 20 supplies power to the load 10 of the energy storage system.

[0029] Automatic switching is achieved when any power supply fails or malfunctions. For example, when the host 6 detects that the AC power supply 9 connected to the main power circuit 20 has disappeared, or that the UPS has failed or the UPS has low power, it automatically switches to the backup power circuit 30 via the power transfer switch 7, and the energy storage battery pack 4 continues to supply power to the load 10. When the host 6 and the battery pack acquisition module 5 detect faults such as excessively high or low SOC / SOH of the energy storage battery pack 4 and abnormal DC bus voltage insulation, an alarm is triggered, and the power transfer switch 7 is controlled to stop the switching operation.

[0030] After the fault in the main power circuit 20 is cleared, the host 6 detects that the main power circuit 20 has returned to normal and controls the power conversion switch 7 to switch back to the main power circuit 20.

[0031] In the description of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A dual-power supply system for controlling an energy storage system, characterized in that: It includes a main power supply circuit (20), a backup power supply circuit (30), a power conversion switch (7), and a host (6); The main power supply circuit (20) includes a UPS power supply (1) and an AC / DC switching power supply (2) connected in sequence. The UPS power supply (1) is connected to an external AC mains power supply (9). The backup power circuit (30) includes a battery storage pack (4) and a DC / DC conversion module (3) connected in sequence. The battery storage pack (4) is connected to a battery acquisition module (5), and the battery acquisition module (5) is connected to the host (6). The input terminal of the power conversion switch (7) is connected to the AC / DC switching power supply (2) and the DC / DC conversion module (3), and the output terminal of the power conversion switch (7) is connected to the external load (10). The main unit (6) is connected to the UPS power supply (1) and the energy storage battery pack (4) respectively.

2. The dual-power supply system for energy storage system control according to claim 1, characterized in that: The host (6) is connected to the power conversion switch (7) and the UPS power supply (1) via RS485 interface.

3. The dual-power supply system for energy storage system control according to claim 1, characterized in that: The host (6) is connected to the battery pack acquisition module (5) via the CAN interface.

4. The dual-power supply system for energy storage system control according to claim 1, characterized in that: An energy management system (8) is connected to the host (6) via a LAN interface.

5. The dual-power supply system for energy storage system control according to claim 1, characterized in that: The main unit (6) is connected to the AC power supply (9) via a hard-wired interface.

Images