Industrial and commercial energy storage cabinet integrating STS to realize rapid grid-connected and off-grid switching

Abstract

The utility model provides an industrial and commercial energy storage cabinet integrating STS to realize rapid grid-connected and off-grid switching. In a cabinet body, an energy storage battery pack is composed of a plurality of stacked liquid-cooled battery packs; one end of the direct-current high-voltage control box is connected with the energy storage battery pack; the liquid cooling unit is respectively connected with the energy storage battery pack and the direct-current high-voltage control box; one end of the energy storage bidirectional converter is connected with the energy storage battery pack, the other end is divided into two branches, one branch is connected with a power grid, and the other branch is connected with a load; the static change-over switch is additionally arranged in a loop of the energy storage bidirectional converter and a power grid; the management controller is respectively connected with the direct-current high-voltage control box, the liquid cooling unit, the energy storage bidirectional converter, the static change-over switch and the electric meter of the load, and the standby power supply is connected with the management controller. According to the industrial and commercial energy storage cabinet, the static change-over switch is integrated in the industrial and commercial energy storage cabinet to realize rapid grid-connected and off-grid switching, and the industrial and commercial energy storage cabinet can provide uninterrupted power supply for some important loads through the standby power supply and the energy storage battery pack.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of energy storage cabinet, specifically, relate to a kind of integrated STS realizes the energy storage cabinet of fast grid-connected and off-grid switching. BACKGROUND

[0002] Currently, there is a significant defect in the technology of industrial and commercial energy storage cabinets, i.e., they cannot complete the fast switching between grid-connected and off-grid within a very short time (within 20 milliseconds). This technical deficiency means that industrial and commercial energy storage cabinets can only serve as backup power sources and cannot provide continuous uninterrupted power supply for critical loads. Due to this limitation in switching speed, industrial and commercial energy storage cabinets are not up to the task when faced with application scenarios that require high reliability and continuous power support. Therefore, they cannot meet the needs of industrial and commercial users who have extremely high requirements for power supply stability, as these users often need to quickly and seamlessly switch to energy storage cabinets for power supply when the power grid fails to ensure the normal operation of critical equipment and production lines. SUMMARY

[0003] In view of the defects in the prior art, the purpose of the utility model is to provide an industrial and commercial energy storage cabinet that integrates STS to achieve fast grid-connected and off-grid switching.

[0004] According to one aspect of the utility model, an industrial and commercial energy storage cabinet that integrates STS to achieve fast grid-connected and off-grid switching is provided, comprising a cabinet body, the cabinet body includes an energy storage battery pack, a DC high-voltage control box, a backup power source, a liquid cooling unit, an energy storage bidirectional converter, a static transfer switch, and a management controller:

[0005] The energy storage battery pack is a number of stacked liquid-cooled battery packs;

[0006] One end of the DC high-voltage control box is connected to the energy storage battery pack, and the other end is connected to the energy storage bidirectional converter;

[0007] The liquid cooling unit is connected to the energy storage battery pack;

[0008] One end of the energy storage bidirectional converter is connected to the energy storage battery pack, and the other end is divided into two branches, one branch is connected to the power grid, and the other branch is connected to the load;

[0009] The static transfer switch is installed in the loop of the energy storage bidirectional converter and the power grid;

[0010] The management controller is connected to the DC high-voltage control box, the liquid cooling unit, the energy storage bidirectional converter, the static transfer switch, and the electric meter of the load, respectively.

[0011] The backup power source is connected to the management controller.

[0012] Preferably, the cabinet body is divided into a direct current cabin and an alternating current cabin located on the left and right sides.

[0013] Preferably, the energy storage battery pack, the direct current high voltage control box and the standby power source are sequentially arranged from top to bottom and installed in the cabin body of the direct current cabin; and the management controller is installed on the cabin door of the direct current cabin.

[0014] Preferably, the liquid cooling unit, the static transfer switch and the energy storage bidirectional converter are sequentially arranged from top to bottom and installed in the alternating current cabin.

[0015] Preferably, the front side and the rear side of the direct current cabin are both provided with a heat dissipation air duct.

[0016] Preferably, the static transfer switch is closed, the power grid and the load are connected through the energy storage bidirectional converter and the energy storage battery pack respectively; and the power grid charges the energy storage battery pack and simultaneously supplies power to the load.

[0017] Preferably, the static transfer switch is closed, the power grid and the load are connected through the energy storage bidirectional converter and the energy storage battery pack respectively; and the energy storage battery pack discharges to the power grid and simultaneously supplies power to the load.

[0018] Preferably, the static transfer switch is closed; the energy storage battery pack is connected to the load through the energy storage bidirectional converter; and the energy storage battery pack supplies power to the load.

[0019] Preferably, the bypass switch is further arranged and connected in parallel on both sides of the static transfer switch.

[0020] Preferably, the bypass switch is closed, the static transfer switch is opened, the power grid, the bypass switch and the load are connected, and the power grid supplies power to the load.

[0021] Compared with the prior art, the utility model has the beneficial effects that:

[0022] The integrated STS realizes the fast grid-connected and off-grid switching of the industrial and commercial energy storage cabinet, has the functions of self energy storage, peak load shifting and dynamic capacity expansion, and has the online UPS (standby power source) function.

[0023] The integrated STS realizes the fast grid-connected and off-grid switching of the industrial and commercial energy storage cabinet, realizes the fast grid-connected and off-grid switching, and provides uninterrupted power supply for the load.

[0024] This utility model discloses an integrated STS (Power Supply System) for industrial and commercial energy storage cabinets that enables rapid grid-connected and off-grid switching. It can achieve automatic grid-connected and off-grid switching. When the STS detects a power outage and lack of voltage on the grid side, it automatically and quickly disconnects and feeds back to the bidirectional energy storage converter, switching the energy storage cabinet to off-grid mode without the need for manual control or off-grid operation. Attached Figure Description

[0025] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 This is an external overall structural diagram of an industrial and commercial energy storage cabinet that integrates STS to achieve rapid on-grid and off-grid switching in one embodiment of this utility model.

[0027] Figure 2 This is a diagram illustrating the internal structure of an industrial and commercial energy storage cabinet that integrates STS to achieve rapid on-grid and off-grid switching in one embodiment of the present invention.

[0028] Figure 3 This is a front view of an industrial and commercial energy storage cabinet with integrated STS for rapid on-grid and off-grid switching, according to an embodiment of the present invention.

[0029] Figure 4 This is a rear view of an industrial and commercial energy storage cabinet with integrated STS for rapid on-grid and off-grid switching, according to one embodiment of the present invention.

[0030] Figure 5 This is a front view of the open state of an industrial and commercial energy storage cabinet that integrates STS to achieve rapid on-grid and off-grid switching in one embodiment of the present invention.

[0031] Figure 6 This is a rear view of the door status of an industrial and commercial energy storage cabinet that integrates STS to achieve rapid on-grid and off-grid switching in one embodiment of the present invention.

[0032] Figure 7 This is a schematic diagram of the charging state of the energy storage cabinet in one embodiment of the present invention.

[0033] Figure 8 This is a schematic diagram of the discharge state of the energy storage cabinet in one embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram of the off-grid state of the energy storage cabinet in one embodiment of the present invention;

[0035] Figure 10 This is a schematic diagram of the bypass operation of the energy storage cabinet in one embodiment of the present invention.

[0036] In the figure, 1-liquid-cooled battery pack, 2-direct current high voltage control box, 3-bypass switch, 4-backup power supply UPS, 5-management controller EMS, 6-liquid cooling unit, 7-static transfer switch STS, 8-energy storage bidirectional converter PCS, 9-direct current cabin, 10-alternating current cabin, 11-power grid, 12-load, 13-cloud platform, 14-electricity meter. DETAILED DESCRIPTION

[0037] The utility model will be explained in detail below in combination with specific embodiments. The following embodiments will help the person skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made. These all belong to the protection scope of the utility model.

[0038] As Figures 1-6 shown, one embodiment of the utility model provides a commercial and industrial energy storage cabinet for realizing fast grid-connected and off-grid switching, comprising a cabinet body, wherein an energy storage battery pack, a direct current high voltage control box 2, a backup power supply 5 (UPS, Uninterruptible Power System), a liquid cooling unit 6, an energy storage bidirectional converter 8 (PCS, Power Conversion System), a static transfer switch 7 (STS, Static Transfer Switch) and a management controller 5 (EMS, Energy Management System) are arranged in the cabinet body.

[0039] The energy storage battery pack comprises a plurality of stacked liquid-cooled battery packs 1; the liquid cooling unit 6 is connected with the energy storage battery pack; one end of the direct current high voltage control box 2 is connected with the energy storage battery pack, and the other end is connected with the energy storage bidirectional converter 8; one end of the energy storage bidirectional converter 8 is connected with the energy storage battery pack, and the other end is divided into two branches, one of which is connected with the power grid, and the other of which is connected with the load; the static transfer switch 7 is installed in the loop of the energy storage bidirectional converter and the power grid. The management controller 5 is connected with the direct current high voltage control box 2, the liquid cooling unit 6, the energy storage bidirectional converter 8 and the static transfer switch 7, and is also connected with the electricity meter 14 of the load 12 and the cloud platform 13. The backup power supply 4 is connected with the management controller 5.

[0040] In some specific embodiments, the connection mode between each component can be a cable or wireless communication.

[0041] The energy storage battery pack is a device for storing and releasing electric energy, which is widely used in photovoltaic, solar energy system and household and commercial energy storage fields. Its working principle is to convert electric energy into chemical energy or physical energy for storage through chemical reaction or physical change, and convert it into electric energy for release when electric energy is needed. The energy storage battery pack in the embodiment mainly consists of a plurality of liquid-cooled battery packs. The liquid-cooled battery pack serves as an energy storage medium of the energy storage cabinet, and can store the power grid power into the liquid-cooled battery pack.

[0042] The DC high-voltage control box is used for controlling the on-off of the DC side loop of the energy storage battery pack. In some other embodiments, it can also be used for data processing and high-voltage detection.

[0043] The standby power supply (UPS, Uninterruptible Power System) is a device for providing standby power for devices and systems when the power supply is interrupted or fails. For example, the energy storage bidirectional converter (PCS, Power Conversion System) is a power electronic device mainly used in energy storage systems to realize the bidirectional flow of electric energy. It is connected between the battery and the power grid 11 or the load 12, responsible for controlling the charging and discharging process of the battery, and converting AC to DC.

[0044] The static transfer switch (STS, Static Transfer Switch) is a non-contact electronic switching device for quickly and automatically switching between two independent power supplies.

[0045] The energy management system (EMS) serves as a communication gateway in the energy storage cabinet, connecting the communication of various devices (such as PCS, liquid-cooled unit) in the energy storage cabinet, and monitoring and controlling various devices in the energy storage cabinet. In some specific embodiments, Yurui Electronics, BaLuoRe Electronics and other brands and models can be used.

[0046] The liquid-cooled unit provides refrigeration or heating for the battery cells in the liquid-cooled battery pack, and controls the temperature of the battery cells during charging and discharging

[0047] The above embodiment integrates the STS (static transfer switch) in the industrial and commercial energy storage cabinet, which can realize fast (within 20ms) and off-grid switching of the industrial and commercial energy storage cabinet.

[0048] In order to make the whole cabinet layout reasonable, in an embodiment of the utility model, the cabinet is designed, and the cabinet is divided into a DC cabin 9 (also called an energy storage battery cabin) and an AC cabin 10 located on the left and right sides. As shown in Figure 5 The energy storage battery pack, the DC high-voltage control box 2 and the standby power supply 4 are arranged in the cabin body of the DC cabin 9 from top to bottom; and the energy management system 5 is installed on the cabin door of the DC cabin 9.Figure 6 As shown in the figure, the liquid cooling unit 6, the static transfer switch 7 and the energy storage bidirectional converter 8 are sequentially arranged from top to bottom and installed in the AC cabin 10.

[0049] Further, in order to facilitate heat dissipation, in a preferred embodiment, the front and rear of the DC cabin are provided with heat dissipation air ducts.

[0050] Based on the structure design of the industrial and commercial energy storage cabinet for realizing fast grid-connected and off-grid switching in the above embodiment, in the working modes of self energy storage, peak load shifting and dynamic capacity expansion, the industrial and commercial energy storage cabinet charges and discharges the energy storage battery pack for peak load shifting or dynamic capacity expansion. In a preferred embodiment, the charging condition is provided, and specifically, as shown in the figure, Figure 7 As shown in the figure, the static transfer switch is closed, the power grid 11 charges the energy storage battery pack, and simultaneously supplies power to the important load 12. In another preferred embodiment, the discharging condition is provided, and specifically, as shown in the figure, Figure 8 As shown in the figure, the static transfer switch 7 is closed, the energy storage battery pack discharges the power grid 11, and supplies power to the important load 12.

[0051] Further, when the static transfer switch is opened, the industrial and commercial energy storage cabinet can realize fast (within 20 ms) grid-connected and off-grid switching, so that the industrial and commercial energy storage cabinet has the functions of self energy storage, peak load shifting, dynamic capacity expansion and the like, and simultaneously has the online UPS function. Specifically, in a preferred embodiment, as shown in the figure, Figure 9 As shown in the figure, in the case of sudden power failure of the power grid, the static transfer switch 7 cannot detect the voltage on the break side, the static transfer switch 7 is opened, so that the energy storage cabinet is quickly (within 20 ms) switched to the off-grid mode, the power grid side of the energy storage cabinet is quickly disconnected, the energy storage cabinet is in the discharging state to supply power to the important load, and the uninterrupted power supply of the important load is ensured.

[0052] In order to enable the power grid to supply power to the load in the fault maintenance mode of the energy storage cabinet, in a preferred embodiment of the utility model, a bypass switch 3 is connected in parallel at both ends of the static transfer switch 7. In the case of fault maintenance of the energy storage cabinet, the bypass switch 3 is closed, and the static transfer switch 7 is opened, so that the power grid can still supply power to the important load, as shown in the figure. Figure 10

[0053] The specific embodiments of the utility model have been described above. It should be understood that the utility model is not limited to the above specific embodiments, and those skilled in the art can make various modifications or changes within the scope of claims, which does not affect the essential content of the utility model. The above preferred features can be arbitrarily combined for use in the case of not conflicting with each other.​

Claims

1. An integrated STS implementation fast and off-grid switching commercial and industrial energy storage cabinet, characterized by, Including cabinet, the cabinet includes energy storage battery group, direct current high voltage control box, standby power supply, liquid cooling unit, energy storage bidirectional converter, static transfer switch and management controller: The energy storage battery group is a number of stacked liquid-cooled battery packs; The direct current high voltage control box is connected to the energy storage battery group at one end and to the energy storage bidirectional converter at the other end; The liquid cooling unit is connected to the energy storage battery group respectively; One end of the energy storage bidirectional converter is connected to the energy storage battery group, and the other end is divided into two branches, one of which is connected to the power grid, and the other of which is connected to the load; The static transfer switch is installed in the loop of the energy storage bidirectional converter and the power grid; The management controller is connected to the direct current high voltage control box, the liquid cooling unit, the energy storage bidirectional converter, the static transfer switch and the load meter respectively; The standby power supply is connected to the management controller.

2. The industrial and commercial energy storage cabinet of claim 1, wherein, The cabinet is divided into a direct current cabin and an alternating current cabin on the left and right sides.

3. The industrial and commercial energy storage cabinet of claim 2, wherein, The energy storage battery group, the direct current high voltage control box and the standby power supply are arranged in order from top to bottom and installed in the cabin body of the direct current cabin; the management controller is installed on the cabin door of the direct current cabin.

4. The industrial and commercial energy storage cabinet of claim 2, wherein, The liquid cooling unit, the static transfer switch and the energy storage bidirectional converter are arranged in order from top to bottom and installed in the alternating current cabin.

5. The industrial and commercial energy storage cabinet of claim 2, wherein, The front and rear sides of the direct current cabin are provided with heat dissipation air ducts.

6. The industrial and commercial energy storage cabinet of claim 1, wherein, When the static transfer switch is closed, the power grid and the load are connected through the energy storage bidirectional converter and the energy storage battery group respectively; the power grid charges the energy storage battery group while supplying power to the load.

7. The industrial and commercial energy storage cabinet of claim 1, wherein, When the static transfer switch is closed, the power grid and the load are connected through the energy storage bidirectional converter and the energy storage battery group respectively; the energy storage battery group discharges to the power grid while supplying power to the load.

8. The industrial and commercial energy storage cabinet of claim 1, wherein, When the static transfer switch is closed, the power grid and the load are connected through the energy storage bidirectional converter and the energy storage battery group respectively; the energy storage battery group discharges to the power grid while supplying power to the load.

9. The industrial and commercial energy storage cabinet of claim 1, wherein, The bypass switch is connected in parallel on both sides of the static transfer switch.

10. The industrial and commercial energy storage cabinet of claim 9, wherein, When the bypass switch is closed and the static transfer switch is opened, the power grid, the bypass switch and the load are connected, and the power grid supplies power to the load.

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