Grid-connected and off-grid switching device suitable for industrial and commercial storage

Abstract

The utility model discloses a grid-connected and off-grid switching device suitable for industrial and commercial storage. Comprising an intelligent static change-over switch STS, and the intelligent static change-over switch STS is used for realizing grid-connected and off-grid rapid switching; the energy storage converter PCS is used for alternating current and direct current conversion; the storage battery pack is connected with the energy storage converter PCS; the EMS communicates with the energy storage converter PCS and the intelligent electric meter through an RS485 interface so as to realize energy scheduling of the grid-connected and off-grid switching cabinet device; wherein the energy storage converter PCS is connected with a load, the intelligent static change-over switch STS is connected between the load and a power grid and cooperates with the energy storage converter PCS, the energy storage converter PCS communicates with the EMS through an RS485 interface, and charging and discharging control over a storage battery pack is achieved. The on-grid and off-grid switching device is suitable for industrial and commercial storage, is applied to the industrial and commercial storage application field, can carry out rapid on-grid and off-grid switching, ensures that important loads are not powered off, and can store electric energy in peak periods and release electric energy in valley periods through the energy storage technology so as to realize balance and scheduling of power grid loads.

Description

Technical Field

[0001] The utility model relates to the technical field of electrochemical energy storage, in particular to an on-grid and off-grid switching device suitable for industrial and commercial energy storage. Background Art

[0002] With economic development and increasing demand for industrial and commercial electricity, the contradiction between power supply and demand has become increasingly prominent. Traditional power systems suffer from energy waste and unstable power supply. While renewable energy sources such as solar and wind power offer advantages in environmental protection and sustainability, their energy output is subject to high instability due to factors such as weather. Traditional industrial and commercial storage systems can only operate in grid-connected mode and are unable to perform energy scheduling and balancing. Traditional on-grid and off-grid switchover cabinets use contactors for control, resulting in high energy consumption and inability to achieve seamless on-grid and off-grid switching, thus failing to ensure continuous power supply to critical loads. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide an on-grid and off-grid switching device suitable for industrial and commercial storage, which is suitable for the application field of industrial and commercial storage, can implement rapid on-grid and off-grid switching to ensure that important loads are not disconnected from the power supply. The energy storage technology can store electrical energy during peak periods and release electrical energy during low periods to achieve grid load balance and scheduling.

[0004] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solution: a grid-connected and off-grid switching device suitable for industrial and commercial storage; comprising:

[0005] Intelligent static transfer switch STS, which is used to achieve fast switching between on-grid and off-grid;

[0006] Energy storage converter PCS, the energy storage converter PCS is used for AC / DC conversion;

[0007] A battery pack connected to the energy storage converter PCS;

[0008] EMS, which communicates with the energy storage converter PCS and smart meter via the RS485 interface to achieve energy scheduling of the on-grid and off-grid switchgear device;

[0009] Among them, the energy storage converter PCS is connected to the load, and the intelligent static transfer switch STS is connected between the load and the grid, and works in conjunction with the energy storage converter PCS. The energy storage converter PCS communicates with the EMS through the RS485 interface to realize the charging and discharging control of the battery pack.

[0010] As a preferred solution of the on-grid and off-grid switching device suitable for industrial and commercial energy storage described in the utility model, the specification of the intelligent static transfer switch STS is 500kW, and the specification of the energy storage converter PCS is 100kW.

[0011] As a preferred solution of the on-grid and off-grid switching device for industrial and commercial storage described in the utility model, it also includes an auxiliary power supply circuit, and the auxiliary power supply circuit includes an auxiliary original board APS1;

[0012] The auxiliary primary board APS1 is used to draw power from the AC and DC sides, taking the side with higher voltage.

[0013] As a preferred solution of the on-grid and off-grid switching device for industrial and commercial storage described in the utility model, wherein the auxiliary power supply circuit further includes an auto-coupling isolation transformer module T2;

[0014] The auto-isolating transformer module T2 is used to isolate the auxiliary power board APS1 from the power grid.

[0015] As a preferred solution of the on-grid and off-grid switching device suitable for industrial and commercial storage described in the utility model, the auxiliary power supply circuit also includes an auxiliary power supply circuit breaker QF12.

[0016] As a preferred solution of the on-grid and off-grid switching device suitable for industrial and commercial storage described in the utility model, the auxiliary source board APS1 has a specification of 120W, the auto-coupling isolation transformer module T2 has a specification of 500W, and the auxiliary source power circuit breaker QF12 has a specification of 6A / 2P.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] (1) In line with the application scenario of industrial and commercial storage, the static transfer switch (intelligent static transfer switch STS) used is 200KW-1000KW and is suitable for industrial and commercial storage users.

[0019] (2) It can perform seamless on-grid and off-grid switching with a switching time of less than 10ms.

[0020] (3) The energy consumption of contactors of the same specifications is higher than that of intelligent static transfer switches STS.

[0021] (4) The auxiliary power used by the on-grid and off-grid switching device is provided by the auxiliary power board, eliminating the need for conventional UPS power supply and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive labor. Among them:

[0023] Figure 1 This is the circuit schematic diagram of the utility model;

[0024] Figure 2 This is the auxiliary power supply circuit diagram of the utility model. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. People skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation methods disclosed below.

[0027] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing the embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0029] The utility model provides an on-grid and off-grid switching device suitable for industrial and commercial storage, which is suitable for the application field of industrial and commercial storage, can implement rapid on-grid and off-grid switching to ensure that important loads are not disconnected. The energy storage technology can store electrical energy during peak periods and release electrical energy during off-peak periods to achieve grid load balance and scheduling.

[0030] Figure 1-Figure 2 The figure shows the overall structure of an embodiment of an on-grid and off-grid switching device for industrial and commercial storage of the present invention. Figure 1-2 , the main structure of this embodiment includes:

[0031] Intelligent static transfer switch STS, which is used to achieve fast switching between on-grid and off-grid;

[0032] Energy storage converter PCS, the energy storage converter PCS is used for AC / DC conversion;

[0033] A battery pack connected to the energy storage converter PCS;

[0034] EMS, which communicates with the energy storage converter PCS and smart meter via the RS485 interface to achieve energy scheduling of the on-grid and off-grid switchgear device;

[0035] Among them, the energy storage converter PCS is connected to the load, and the intelligent static transfer switch STS is connected between the load and the grid, and works in conjunction with the energy storage converter PCS. The energy storage converter PCS communicates with the EMS through the RS485 interface to realize the charging and discharging control of the battery pack.

[0036] In actual use, this device supports both grid-connected and off-grid operation. The intelligent static transfer switch STS and the energy storage converter PCS form an on-grid and off-grid switching system to achieve fast and automatic switching between the two modes, ensuring that important loads do not lose power. At this time, there is voltage on the grid side, and the energy storage converter PCS module acts as a current source, performing inversion / rectification according to user needs, and charging or discharging the battery. Its power scheduling is determined by the data set by the user.

[0037] On-grid to off-grid:

[0038] First, the equipment operates according to the set power in the grid-connected state. At this time, the mains power suddenly fails. The grid-connected switching system composed of the intelligent static transfer switch STS and the energy storage converter PCS will detect and identify the grid-side voltage. When it is identified that there is no voltage in the grid, the intelligent static transfer switch STS is disconnected and the information is reported to the energy storage converter PCS. After receiving the information, the energy storage converter PCS switches to off-grid mode to supply power to important loads. The response time of the whole process is within 100ms, thereby ensuring that important loads are not disconnected in the event of a grid outage.

[0039] Off-grid to grid-connected:

[0040] At this time, the equipment is operating in an off-grid state, providing a constant AC voltage for important loads. When the mains power comes back on, the grid-connected and off-grid switching system composed of the intelligent static transfer switch STS and the energy storage converter PCS detects and identifies the grid-side voltage. When it is identified that the grid has voltage, the phase of the AC parameters of the current grid is locked and adapted. The intelligent static transfer switch STS reports the detected three-phase voltage information to the energy storage converter PCS. The energy storage converter PCS receives the information and makes adjustments. After completing the phase lock, the intelligent static transfer switch STS closes and the energy storage converter PCS switches to the grid-connected mode, completing the system's disconnection and connection process.

[0041] Furthermore, the auxiliary power supply circuit used has the function of starting without power failure compared to the traditional UPS power supply circuit. At the same time, it is cheaper than UPS and can better control costs.

[0042] Specifically, it also includes an auxiliary power supply circuit, which includes an auxiliary source board APS1; wherein the auxiliary source board APS1 is used to draw power from the AC and DC sides, taking the side with higher voltage, and the auxiliary power supply circuit also includes an auto-coupling isolation transformer module T2; wherein the auto-coupling isolation transformer module T2 is used to isolate the auxiliary source board APS1 from the power grid, and the auxiliary power supply circuit also includes an auxiliary power supply circuit breaker QF12;

[0043] In actual use, the APS1 auxiliary power board, with a power output of 120W, can draw power from both the AC and DC sides. This ensures that the battery's DC side provides power in the event of a grid outage, ensuring uninterrupted operation of the system's auxiliary power supply. Each battery cluster is equipped with an auxiliary power board, ensuring that the cluster is managed and that a failure in one cluster does not affect the auxiliary power supply of other clusters.

[0044] While the present invention has been described above with reference to specific embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, as long as no structural conflicts exist, the various features of the embodiments disclosed herein may be combined with one another in any manner, and the omission of an exhaustive description of these combinations in this specification is solely for the sake of space and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A grid-connected and off-grid switching device suitable for industrial and commercial storage; characterized in that: include: Intelligent static transfer switch STS, which is used to achieve fast switching between on-grid and off-grid; Energy storage converter PCS, the energy storage converter PCS is used for AC / DC conversion; A battery pack connected to the energy storage converter PCS; EMS, which communicates with the energy storage converter PCS and smart meter via the RS485 interface to achieve energy scheduling of the on-grid and off-grid switchgear device; Among them, the energy storage converter PCS is connected to the load, and the intelligent static transfer switch STS is connected between the load and the grid, and works in conjunction with the energy storage converter PCS. The energy storage converter PCS communicates with the EMS through the RS485 interface to realize the charging and discharging control of the battery pack.

2. The on-grid and off-grid switching device suitable for industrial and commercial storage according to claim 1, characterized in that: The specification of the intelligent static transfer switch STS is 500kW, and the specification of the energy storage converter PCS is 100kW.

3. The on-grid and off-grid switching device suitable for industrial and commercial storage according to claim 2, characterized in that: It also includes an auxiliary power supply circuit, which includes an auxiliary original board APS1; The auxiliary primary board APS1 is used to draw power from the AC and DC sides, taking the side with higher voltage.

4. The on-grid and off-grid switching device suitable for industrial and commercial storage according to claim 3, characterized in that: The auxiliary power supply circuit also includes an auto-isolating transformer module T2; The auto-isolating transformer module T2 is used to isolate the auxiliary power board APS1 from the power grid.

5. The on-grid and off-grid switching device suitable for industrial and commercial storage according to claim 4, characterized in that: The auxiliary power supply circuit also includes an auxiliary power supply circuit breaker QF12.

6. The on-grid and off-grid switching device for industrial and commercial storage according to claim 5, characterized in that: The auxiliary source board APS1 has a specification of 120W, the auto-isolating transformer module T2 has a specification of 500W, and the auxiliary power supply circuit breaker QF12 has a specification of 6A / 2P.

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