Isolation type auxiliary source power supply device for optical storage all-in-one machine

Abstract

The utility model discloses an isolation type auxiliary source power supply device for an optical storage all-in-one machine, which comprises a large-capacity optical storage all-in-one machine, and the large-capacity optical storage all-in-one machine comprises a bidirectional DC / DC customized power supply module, an MPPT photovoltaic module, an energy storage bidirectional AC / DC converter, a static change-over switch, an energy management module and an isolation transformer. And an isolation type auxiliary source power supply structure, wherein the isolation type auxiliary source power supply structure comprises a T2-autotransformer and an M4 auxiliary original board. According to the utility model, a small isolation transformer + auxiliary source board power supply system loop is adopted, the control is simple and stable, alternating current and direct current can be supplied to an auxiliary original board, the power can be supplied from a direct current side when a power grid is powered off, and the price of the small isolation transformer + auxiliary original board power supply system is lower than that of a UPS with a power supply of the same specification.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic storage, in particular to an isolated auxiliary source power supply device for a photovoltaic storage integrated machine. Background Art

[0002] With national encouragement of the development and utilization of renewable energy and market support, the use of industrial and commercial photovoltaic power generation has seen rapid and widespread development. Utilizing the rooftops of enterprises, institutions, schools, hospitals, commercial buildings, office buildings, hotels, shopping malls, industrial plants, and other buildings to build photovoltaic power generation systems, using a distributed grid-connected approach, generating power for their own use, with surplus power or full grid access, can not only greatly improve local absorption capacity and alleviate pressure on the grid, but also significantly reduce the installer's electricity bills. Combining industrial and commercial photovoltaics with energy storage can make photovoltaic power generation more stable and reliable, ensuring internal power supply even during power outages in the main grid. With relatively low investment risk and stable returns, industrial and commercial photovoltaics are gaining favor with a growing number of investors. Industrial and commercial integrated photovoltaic power generation systems with photovoltaic storage will become a widely adopted photovoltaic storage power generation solution.

[0003] However, traditional solar-storage systems typically use a UPS for auxiliary power. First, the UPS's backup power supply is limited. If the grid is out of service for an extended period, the UPS cannot sustain it, leading to system failures and downtime, reducing customer revenue. Second, UPS costs are prohibitive, hindering cost control. Third, conventional UPSs can only draw power from AC. After AC power is drawn, a switch is required to convert the AC220V power supply to DC24V for auxiliary power. This limited power supply method also incurs additional costs for supporting the system. Utility Model Content

[0004] Therefore, the purpose of the present invention is to provide an isolated auxiliary power supply device for an integrated photovoltaic and storage machine, which adopts a small isolation transformer + auxiliary source board power supply system circuit, which is simple and stable to control, and can draw power from both AC and DC to the auxiliary source board, ensuring that when the power grid is out of power, power can be drawn from the DC side. The small isolation transformer + auxiliary source board power supply system is cheaper than a UPS with the same specifications.

[0005] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solution: an isolated auxiliary power supply device for an integrated photovoltaic and storage device, comprising:

[0006] A large-capacity integrated photovoltaic and storage device, comprising a bidirectional DC / DC custom power supply module, an MPPT photovoltaic module, a bidirectional AC / DC converter for energy storage, a static transfer switch, an energy management module, and an isolation transformer;

[0007] An isolated auxiliary power supply structure includes a T2-autotransformer and an M4 auxiliary source board.

[0008] As a preferred solution of the isolated auxiliary source power supply device for the photovoltaic and storage integrated machine described in the utility model, the large-capacity photovoltaic and storage integrated machine is used to connect photovoltaics and batteries, and the large-capacity photovoltaic and storage integrated machine supports a capacity of 100kW.

[0009] As a preferred solution of the isolated auxiliary power supply device for an integrated photovoltaic and storage device described in the present invention, the T2-autotransformer and the M4 auxiliary source board are selected according to the capacity and the amount of auxiliary power required.

[0010] As a preferred solution of the isolated auxiliary power supply device for a photovoltaic and storage integrated machine described in the utility model, it also includes a photovoltaic and storage integrated system, which is constructed by a large-capacity photovoltaic and storage integrated machine.

[0011] As a preferred solution of an isolated auxiliary power supply device for a photovoltaic and storage integrated machine described in the utility model, the photovoltaic and storage integrated system includes STS, DC / DC, MPPT, battery, EMS, PCS module, PV component and isolation transformer.

[0012] As a preferred solution of an isolated auxiliary power supply device for a photovoltaic and storage integrated machine described in the utility model, the battery pack is connected to the PCS module, the PCS module is connected to the load through an isolation transformer, the STS is connected between the load and the power grid, the PCS module communicates with the EMS through the RS485 interface, and the EMS communicates with the PCS module, BMS, DC / DC and smart meter through the RS485 interface.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] The small isolation transformer + auxiliary source board power supply system circuit is simple and stable to control. Both AC and DC can be used to supply power to the auxiliary source board, ensuring that power can be taken from the DC side when the power grid is out. The small isolation transformer + auxiliary source board power supply system is cheaper than a UPS with the same power specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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:

[0016] Figure 1 This is the overall working principle diagram of the utility model;

[0017] Figure 2 This is the structure diagram of the T2-autotransformer and M4 auxiliary board of the utility model;

[0018] Figure 3 This is the working circuit diagram of the utility model;

[0019] Figure 4 This is a system diagram of the integrated optical storage system of the utility model. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] The utility model provides an isolated auxiliary power supply device for an integrated photovoltaic and storage device. The device adopts a small isolation transformer + auxiliary source board power supply system circuit, which is simple and stable to control. Both AC and DC power can be taken to the auxiliary source board, ensuring that power can be taken from the DC side when the power grid is cut off. The small isolation transformer + auxiliary source board power supply system is cheaper than a UPS with the same specifications.

[0025] Figures 1-4 The figure shows the overall structure of an embodiment of an isolated auxiliary power supply device for an integrated optical storage device of the present invention. Figure 1-4 The main structure of this embodiment includes: a large-capacity optical storage integrated machine and an isolated auxiliary power supply structure.

[0026] The large-capacity photovoltaic and storage integrated device is used to connect photovoltaics and batteries. Specifically, the large-capacity photovoltaic and storage integrated device includes a bidirectional DC / DC customized power supply module, an MPPT photovoltaic module, a bidirectional AC / DC converter for energy storage, a static transfer switch, an energy management module, and an isolation transformer.

[0027] In actual use, the large-capacity photovoltaic and storage integrated centralized hybrid energy storage system product has an integrated on-grid and off-grid solution, supports seamless on-grid and off-grid switching, and supports a 100kW system capacity.

[0028] The isolated auxiliary power supply structure is used for dual power supply. Specifically, the isolated auxiliary power supply structure includes a T2-autotransformer and an M4 auxiliary source board;

[0029] During actual use, power is taken from the grid to the QF-auxiliary source micro-circuit breaker, then to the input end of the autotransformer, and then 220VAC is output from the output end to the J17 terminal of the M4 board. J17 is AC 220VAC power, and then the M4 auxiliary source board rectifies it to DC24V output. The bus voltage is taken from the DC side of the battery to the J16 terminal of the M4 board. As long as the battery voltage is between 200V-950V, the auxiliary source board can be started, and then the voltage is reduced to DC24V output. The power priority logic is that whichever voltage is higher, the AC voltage or the DC voltage, is used.

[0030] Furthermore, QF4 is a battery DC molded case circuit breaker; J18 is two DC24V outputs connected to the XT terminal block for auxiliary power supply to EMS, STS, and HMI;

[0031] Furthermore, it also includes a photovoltaic storage integrated system, which is built with a large-capacity photovoltaic storage integrated machine, and the photovoltaic storage integrated system includes STS, DC / DC, MPPT, battery, EMS, PCS module, PV module and isolation transformer;

[0032] In actual use, the battery pack is connected to the PCS module, which is then connected to the load via an isolation transformer. The STS is connected between the load and the grid, working in conjunction with the PCS module to achieve rapid on-grid and off-grid switching without powering the load. The PCS module communicates with the EMS via an RS485 interface, indirectly controlling the battery pack's charge and discharge. The EMS communicates with the PCS module, BMS, DC / DC converter, and smart meter via the RS485 interface to facilitate energy scheduling for the solar-storage system. Because the EMS, STS, HMI, and some control relays all draw power from 24VDC, this system is required to provide uninterruptible power to the EMS and STS, ensuring stable and smooth system operation.

[0033] The above technical solution can use both AC and DC power, a dual power supply method, to ensure that the system can perform black start operation when the grid is outage. With an isolation transformer, since the STS is a non-isolated system, an isolation transformer needs to be added to the STS power supply to ensure that the STS power supply is stable and will not trip. This solution is not only suitable for photovoltaic storage systems, but also for on-grid and off-grid function switching scenarios.

[0034] 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. An isolated auxiliary power supply device for an integrated optical storage device, characterized in that: include: A large-capacity integrated photovoltaic and storage device, comprising a bidirectional DC / DC custom power supply module, an MPPT photovoltaic module, a bidirectional AC / DC converter for energy storage, a static transfer switch, an energy management module, and an isolation transformer; An isolated auxiliary power supply structure includes a T2-autotransformer and an M4 auxiliary source board.

2. The isolated auxiliary power supply device for a photovoltaic and storage integrated device according to claim 1, characterized in that: The large-capacity photovoltaic and storage integrated machine is used to connect photovoltaics and batteries, and the large-capacity photovoltaic and storage integrated machine supports a capacity of 100kW.

3. The isolated auxiliary power supply device for a photovoltaic and storage integrated device according to claim 2, characterized in that: The T2-autotransformer and M4 auxiliary board are selected according to the capacity and the amount of auxiliary power required.

4. The isolated auxiliary power supply device for an integrated optical storage device according to claim 3, characterized in that: It also includes an integrated optical and storage system, which is built with a large-capacity integrated optical and storage machine.

5. The isolated auxiliary power supply device for a photovoltaic and storage integrated device according to claim 4, characterized in that: The integrated photovoltaic and storage system includes STS, DC / DC, MPPT, battery, EMS, PCS module, PV components and isolation transformer.

6. The isolated auxiliary power supply device for an integrated photovoltaic and storage device according to claim 5, characterized in that: The battery pack is connected to the PCS module, the PCS module is connected to the load through an isolation transformer, the STS is connected between the load and the grid, the PCS module communicates with the EMS through the RS485 interface, and the EMS communicates with the PCS module, BMS, DC / DC and smart meter through the RS485 interface.

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