Energy storage system with online ups function

Abstract

The embodiment of the application discloses an energy storage system with online UPS function; the system comprises a controller, an acquisition device, a rectifier module, an inverter module, a battery pack, a bidirectional current conversion module and a static conversion module; the controller is connected with the acquisition device, the rectifier module, the inverter module, the battery pack, the bidirectional current conversion module and the static conversion module; a first end of the rectifier module is connected with commercial power, a first end of the bidirectional current conversion module and a normal power supply end of the static conversion module, a second end of the rectifier module is connected with a first end of the inverter module, the battery pack and a second end of the bidirectional current conversion module, a second end of the inverter module is connected with a standby battery end of the static conversion module, and a power supply output end of the static conversion module is connected with a load; high-efficiency energy storage is realized, the reliability and stability of power supply are improved, and equipment damage caused by power problems is reduced.

Description

Technical Field

[0001] This application relates to the field of energy storage system technology, and particularly to an energy storage system that also has online UPS functionality. Background Technology

[0002] Currently, conventional energy storage can only be used as a charging and discharging device. When the power grid fails, energy storage can only passively provide power to the load, causing a temporary power outage. Some grid-sensitive equipment will inevitably shut down or restart, resulting in reduced factory production. In some situations, it is necessary to profit from peak and off-peak pricing through energy storage, while also providing backup power. However, traditional UPS systems can only serve as backup power and cannot operate in parallel with the power grid. Summary of the Invention

[0003] This application provides an energy storage system that also functions as an online UPS, enabling efficient energy storage and providing a stable, uninterrupted, high-quality power supply to critical loads when the power grid experiences anomalies. This improves the reliability and stability of the power supply and reduces the risk of equipment damage due to power problems.

[0004] In a first aspect, embodiments of this application provide an energy storage system that also functions as an online UPS, including: a controller, a data acquisition unit, a rectifier module, an inverter module, a battery pack, a bidirectional converter module, and a static conversion module; The controller is connected to the data acquisition unit, the rectifier module, the inverter module, the battery pack, the bidirectional converter module, and the static converter module. The first end of the rectifier module is connected to the mains power, the first end of the bidirectional converter module is connected to the common power supply end of the static conversion module, the second end of the rectifier module is connected to the first end of the inverter module, the battery pack and the second end of the bidirectional converter module, the second end of the inverter module is connected to the backup battery end of the static conversion module, and the power output end of the static conversion module is connected to the load. The static conversion module includes a first bidirectional thyristor and a second bidirectional thyristor; the first bidirectional thyristor is connected to the mains power and the load, and the second bidirectional thyristor is connected to the second terminal of the inverter module and the load.

[0005] In some embodiments, the bidirectional converter module is connected to mains power via a first switch.

[0006] In some embodiments, the rectifier module is connected to mains power via a second switch.

[0007] In some embodiments, the rectifier module is connected to the battery pack via a first DC switch, and the bidirectional converter module is connected to the battery pack via a second DC switch.

[0008] In some embodiments, the static conversion module is connected to the load via an output switch.

[0009] In some embodiments, the load is connected to mains power via a manual bypass switch.

[0010] In some embodiments, a data acquisition unit is further included, which is used to acquire the voltage of the common power supply terminal of the static conversion module and the voltage of the backup battery terminal of the static conversion module.

[0011] In some embodiments, the first bidirectional thyristor includes a first thyristor and a second thyristor, the negative terminal of the first thyristor is connected to the positive terminal of the second thyristor and the mains power, and the positive terminal of the first thyristor is connected to the negative terminal of the second thyristor and the load.

[0012] In some embodiments, the second bidirectional thyristor includes a third thyristor and a fourth thyristor, wherein the negative terminal of the third thyristor is connected to the positive terminal of the fourth thyristor and the second terminal of the inverter module, and the positive terminal of the third thyristor is connected to the negative terminal of the fourth thyristor and the load.

[0013] In some embodiments, the first bidirectional thyristor and the second bidirectional thyristor are of model number KS20-12.

[0014] This application embodiment connects the mains power to the rectifier module, inverter module, static conversion module, and load to achieve power supply after rectification and inversion of AC power from the grid; the battery pack serves as backup, and the bidirectional converter module can use the battery to provide power during grid anomalies, and can also charge the battery; the controller coordinates the switches, modules, etc., monitors the status, and executes switching to ensure stable power supply and rapid response; it achieves efficient energy storage and provides a stable, uninterrupted, high-quality power supply to important loads when grid anomalies occur, improving the reliability and stability of power supply and reducing equipment damage due to power problems. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an energy storage system with online UPS functionality provided in an embodiment of this application. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, specific embodiments of this application will be described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining this application and not for limiting it. It should also be noted that, for ease of description, only the parts relevant to this application are shown in the drawings, not all of them. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe operations (or steps) as sequential processes, many of these operations can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but may also have additional steps not included in the drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0017] Please refer to Figure 1 This application provides an energy storage system with online UPS functionality. The energy storage system with online UPS functionality specifically includes: a controller, a data acquisition unit, a rectifier module, an inverter module, a battery pack, a bidirectional converter module, and a static conversion module. The controller is connected to the data acquisition unit, the rectifier module, the inverter module, the battery pack, the bidirectional converter module, and the static converter module. The first end of the rectifier module is connected to the mains power, the first end of the bidirectional converter module is connected to the common power supply end of the static conversion module, the second end of the rectifier module is connected to the first end of the inverter module, the battery pack and the second end of the bidirectional converter module, the second end of the inverter module is connected to the backup battery end of the static conversion module, and the power output end of the static conversion module is connected to the load. The static conversion module includes a first bidirectional thyristor and a second bidirectional thyristor; the first bidirectional thyristor is connected to the mains power and the load, and the second bidirectional thyristor is connected to the second terminal of the inverter module and the load.

[0018] In some embodiments, the bidirectional converter module is connected to the mains power via a first switch; the rectifier module is connected to the mains power via a second switch; the rectifier module is connected to the battery pack via a first DC switch, and the bidirectional converter module is connected to the battery pack via a second DC switch; the static conversion module is connected to the load via an output switch; the load is connected to the mains power via a manual bypass switch; and the system also includes a data acquisition unit for acquiring the voltage at the common power supply terminal of the static conversion module and the voltage at the backup battery terminal of the static conversion module.

[0019] Specifically, the rectifier module converts AC mains power to DC mains power to supply power to downstream circuits and can also charge the battery; the inverter module converts DC mains power to AC mains power to provide a stable AC power supply to the load; the energy storage battery pack stores electrical energy and uses rechargeable batteries such as lithium batteries or lead-acid batteries; the bidirectional converter module enables bidirectional energy flow between DC and AC mains power; the static conversion module is connected between the mains power and the load for seamless switching between mains power supply and power supply from this device; the data acquisition unit collects information such as voltage, phase, and amplitude to provide judgment signals for seamless switching.

[0020] In some embodiments, the first bidirectional thyristor includes a first thyristor and a second thyristor, the negative terminal of the first thyristor is connected to the positive terminal of the second thyristor and the mains power, and the positive terminal of the first thyristor is connected to the negative terminal of the second thyristor and the load; the second bidirectional thyristor includes a third thyristor and a fourth thyristor, the negative terminal of the third thyristor is connected to the positive terminal of the fourth thyristor and the second terminal of the inverter module, and the positive terminal of the third thyristor is connected to the negative terminal of the fourth thyristor and the load.

[0021] In some embodiments, the first bidirectional thyristor and the second bidirectional thyristor are of model number KS20-12.

[0022] As described above, the embodiments of this application integrate online UPS and energy storage functions: the device of the embodiments of this application can simultaneously realize the uninterrupted power supply function of online UPS and the energy management function of energy storage system, thereby improving the utilization rate of equipment and the flexibility of system.

[0023] Seamless switching capability: Through the coordinated work of the static conversion module and the energy management system, it can achieve millisecond-level seamless switching when the mains power is interrupted, meeting the load requirements with extremely high power continuity requirements, such as data centers and medical equipment.

[0024] Optimized battery management: The battery management unit dynamically adjusts the charging and discharging strategy based on the battery's SOC, SOH, and other states to avoid overcharging and over-discharging, extend battery life, and reduce system maintenance costs.

[0025] Energy optimization and utilization: In energy storage mode, the system can intelligently control battery charging and discharging based on the peak and off-peak electricity prices of the power grid or the power generation of renewable energy, so as to maximize economic benefits.

[0026] As described above, the embodiments of this application connect the mains power to the rectifier module, inverter module, static conversion module, and load to achieve power supply after rectification and inversion of AC power from the grid; the battery pack serves as backup, and the bidirectional converter module can use the battery to invert power supply when the grid is abnormal, and can also charge the battery; the controller coordinates the switches, modules, etc., monitors the status, and executes switching to ensure stable power supply and rapid response; it achieves efficient energy storage and provides a stable, uninterrupted, high-quality power supply to important loads when the grid is abnormal, improving the reliability and stability of the power supply and reducing equipment damage due to power problems.

[0027] The above description is merely a preferred embodiment and the technical principles employed in this application. This application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions that can be made by those skilled in the art will not depart from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the claims.

Claims

1. An energy storage system with integrated online UPS functionality, characterized in that, include: Controller, data acquisition unit, rectifier module, inverter module, battery pack, bidirectional converter module, and static converter module; The controller is connected to the data acquisition unit, the rectifier module, the inverter module, the battery pack, the bidirectional converter module, and the static converter module. The first end of the rectifier module is connected to the mains power, the first end of the bidirectional converter module is connected to the common power supply end of the static conversion module, the second end of the rectifier module is connected to the first end of the inverter module, the battery pack and the second end of the bidirectional converter module, the second end of the inverter module is connected to the backup battery end of the static conversion module, and the power output end of the static conversion module is connected to the load. The static conversion module includes a first bidirectional thyristor and a second bidirectional thyristor; the first bidirectional thyristor is connected to the mains power and the load, and the second bidirectional thyristor is connected to the second terminal of the inverter module and the load.

2. The energy storage system with online UPS function according to claim 1, characterized in that, The bidirectional converter module is connected to the mains power supply via a first switch.

3. The energy storage system with online UPS function according to claim 1, characterized in that, The rectifier module is connected to the mains power supply via a second switch.

4. The energy storage system with online UPS function according to claim 1, characterized in that, The rectifier module is connected to the battery pack via a first DC switch, and the bidirectional converter module is connected to the battery pack via a second DC switch.

5. The energy storage system with online UPS function according to claim 1, characterized in that, The static conversion module is connected to the load via an output switch.

6. The energy storage system with online UPS function according to claim 1, characterized in that, The load is connected to the mains power supply via a manual bypass switch.

7. The energy storage system with online UPS function according to claim 1, characterized in that, It also includes a data acquisition unit, which is used to acquire the voltage of the common power supply terminal of the static conversion module and the voltage of the backup battery terminal of the static conversion module.

8. The energy storage system with online UPS function according to claim 1, characterized in that, The first bidirectional thyristor includes a first thyristor and a second thyristor. The negative terminal of the first thyristor is connected to the positive terminal of the second thyristor and the mains power, and the positive terminal of the first thyristor is connected to the negative terminal of the second thyristor and the load.

9. The energy storage system with online UPS function according to claim 1, characterized in that, The second bidirectional thyristor includes a third thyristor and a fourth thyristor. The negative terminal of the third thyristor is connected to the positive terminal of the fourth thyristor and the second terminal of the inverter module, and the positive terminal of the third thyristor is connected to the negative terminal of the fourth thyristor and the load.

10. The energy storage system with online UPS function according to claim 1, characterized in that, The first bidirectional thyristor and the second bidirectional thyristor are model KS20-12.

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