Modularized energy storage, current transformation and voltage boosting all-in-one machine

Abstract

The utility model belongs to the technical field of electric power systems, and particularly relates to a modularized energy storage, current transformation and voltage boosting all-in-one machine. Comprising a base and an energy storage converter located at one end of the base, the other end of the base is provided with a cabin used for containing a boosting transformer and a grid-connected unit, the boosting transformer with the low-voltage side connected with the alternating-current side of the energy storage converter is arranged at the end, close to the energy storage converter, in the cabin, and the grid-connected unit is arranged at the other end, close to the base, in the cabin. And the high-voltage side of the boosting transformer is connected with a main loop copper bar of the grid-connected unit through a busbar. And flexible configuration can be realized through the busbar, no requirement on the transformer model and the high-voltage grid-connected unit structure is required, and replacement, operation and maintenance are facilitated. The technical problems that in the prior art, energy storage and conversion all-in-one machine units are complex in connection and inconvenient to disassemble, and later maintenance of equipment is not facilitated are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power systems, and particularly relates to a modular energy storage converter and booster integrated machine. Background Art

[0002] The electrical equipment in a new energy power station constructed by electrochemical energy storage generally includes an energy storage battery bin, a DC busbar trunking, an energy storage converter cabinet, a high-voltage grid connection cabinet, a step-up transformer, a low-voltage power distribution cabinet, and a measurement and control communication cabinet, as Figure 1 shown.

[0003] The published text of a Chinese invention patent application with the application publication number CN116053998A and the application publication date of May 2, 2023 discloses an energy storage converter and booster integrated machine, which includes a base and a high-voltage chamber, a low-voltage chamber, a transformer, and an energy storage converter arranged on the base. Specifically, the high-voltage chamber and the low-voltage chamber are adjacent to each other in the width direction of the base at one end of the base, and an energy storage converter is arranged at the other end of the base. A transformer is arranged between the energy storage converter and the high-voltage chamber, and the transformer is arranged adjacent to the outer wall of the high-voltage chamber. The high-voltage outgoing terminal of the transformer directly extends into the high-voltage chamber through a wall bushing, and the high-voltage chamber connects the boosted power supply to the power grid. In this solution, the installation of the energy storage converter and booster integrated machine equipment is more compact and centralized, and the floor area is reduced. However, in order to closely arrange the high-voltage side of the transformer and the high-voltage chamber in this solution, the high-voltage outgoing terminal of the high-voltage side of the transformer directly extends into the high-voltage chamber, which requires special customization of the high-voltage chamber according to the position of the high-voltage side terminal of the transformer, and has high requirements for the transformer model and the layout of the high-voltage chamber, which is not conducive to replacement and operation and maintenance; and the connection between the transformer and the high-voltage chamber is more complex and it is more inconvenient to disassemble. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a modular energy storage converter and booster integrated machine to solve the technical problems in the prior art that the connection between the units of the energy storage converter integrated machine is complex, inconvenient to disassemble, and not conducive to the later maintenance of the equipment.

[0005] To solve the above technical problems, a technical solution of a modular energy storage converter and booster integrated machine provided by the utility model is: a modular energy storage converter and booster integrated machine, including a base and an energy storage converter located at one end of the base, a cabin for accommodating a step-up transformer and a grid connection unit is arranged at the other end of the base, a step-up transformer with its low-voltage side connected to the AC side of the energy storage converter is arranged at one end of the cabin close to the energy storage converter, a grid connection unit is arranged at a position close to the other end of the base in the cabin, and the high-voltage side of the step-up transformer is connected to the main circuit copper bar of the grid connection unit through a busbar.

[0006] The beneficial effects of the above technical solution are as follows: The technical solution of a modular energy storage converter and booster integrated machine of the present utility model belongs to an improved invention. The modular energy storage converter and booster integrated machine of the present utility model includes a base and an energy storage converter located at one end of the base. At the other end of the base, there is a cabin for accommodating a booster transformer and a grid connection unit. At one end of the cabin close to the energy storage converter, there is a booster transformer with its low-voltage side connected to the AC side of the energy storage converter. At the other end of the cabin close to the base, there is a grid connection unit. The high-voltage side of the booster transformer is connected to the main circuit copper busbar of the grid connection unit through a busbar. It can be flexibly configured through the busbar, has no requirements for the transformer model and the structure of the high-voltage grid connection unit, and is convenient for replacement and operation and maintenance. It solves the technical problems in the prior art that the connection between the units of the energy storage converter integrated machine is complex, not convenient for disassembly, and not conducive to the later maintenance of the equipment.

[0007] Further, the AC side of the energy storage converter and the low-voltage side of the booster transformer are integrally connected through a copper busbar.

[0008] Further, a circuit breaker for controlling the shutdown of the energy storage converter and the booster transformer is provided on the copper busbar.

[0009] Further, a low-voltage cabinet for integrating low-voltage equipment is also provided in the cabin.

[0010] Further, the grid connection unit includes a load switch fuse for connecting to the high-voltage power grid, and the load switch fuse is detachably installed inside the cabin.

[0011] Further, a buckle is provided on the body of the load switch fuse, and the load switch fuse is fixed in the cabin through the buckle.

[0012] Further, a measurement and control communication unit for monitoring the status of each unit is also installed in the cabin.

[0013] Further, a low-voltage power distribution unit for providing a voltage power supply and the measurement and control communication unit are integrated in the low-voltage cabinet.

[0014] Further, a cooling system device for heat dissipation is also installed in the cabin. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the main equipment of an electrochemical energy storage power station in the prior art;

[0016] Figure 2 It is a layout schematic diagram of an embodiment of a modular energy storage converter and booster integrated machine of the present utility model;

[0017] Figure 3 It is a general circuit diagram of the main circuit of an embodiment of a modular energy storage converter and booster integrated machine of the present utility model;

[0018] Figure 4 Schematic diagrams of each unit of an embodiment of a modular energy storage converter and booster integrated machine of the present utility model;

[0019] Figure 5 Schematic diagram of copper busbar connection of an embodiment of a modular energy storage converter and booster integrated machine of the present utility model;

[0020] Figure 6 Schematic diagram of the setting of a low-voltage circuit breaker when an energy storage converter and a booster transformer are separately configured in the prior art;

[0021] Figure 7 Schematic diagram of the setting of a low-voltage circuit breaker between the energy storage converter and the booster transformer of an embodiment of a modular energy storage converter and booster integrated machine of the present utility model.

[0022] Figure 8 Schematic diagram of fuse installation of an embodiment of a modular energy storage converter and booster integrated machine of the present utility model.

[0023] Among them, 1. Energy storage converter; 2. Booster transformer; 3. High-voltage grid connection unit; 4. Low-voltage cabinet; 5. Main circuit copper busbar of the grid connection unit; 6. Copper busbar; 7. Low-voltage circuit breaker; 8. Fuse; 9. Fuse buckle. Specific implementation manners

[0024] In view of system differences such as different grid connection voltage levels of power stations, the present utility model utilizes an integrated grid connection unit, and each functional unit adopts a modular design and configuration to achieve a flexible and convenient configuration scheme for multi-scenario power station applications. It solves the technical problems in the prior art that due to the differences in the technical and manufacturing levels of each equipment supplier, the difficulty and cost of installation, commissioning, and later operation and maintenance are relatively high.

[0025] Embodiment of a modular energy storage converter and booster integrated machine:

[0026] As Figure 2 shown, a modular energy storage converter and booster integrated machine of this embodiment includes a base and an energy storage converter located at one end of the base. It is characterized in that a cabin for accommodating a booster transformer and a grid connection unit is provided at the other end of the base. A booster transformer with its low voltage side connected to the AC side of the energy storage converter is provided at one end of the cabin close to the energy storage converter, and a grid connection unit is provided at a position close to the other end of the base in the cabin. The high voltage side of the booster transformer is connected to the main circuit copper busbar of the grid connection unit through a busbar. As Figure 4 shown, the dotted box in the figure shows each unit included in the modular energy storage converter and booster integrated machine of this embodiment.

[0027] Specifically, in this embodiment, the base is a preassembled base mechanism, on which the energy storage converter 1 and the cabin are installed. The preassembled base mechanism is responsible for completing the installation and fixation of the energy storage converter 1 and the cabin in the factory, so as to achieve the purpose of overall installation of the energy storage converter and booster on site, improve construction efficiency, ensure the assembly accuracy of the energy storage converter and booster, and reduce engineering costs.

[0028] In this embodiment, the energy storage converter 1 is responsible for connecting the energy storage battery and the low voltage side of the boost transformer 2 in the cabin, and performs the energy storage bidirectional conversion function by executing the control command of the integrated machine to realize the charging and discharging of the battery cluster.

[0029] In this embodiment, a low-voltage distribution unit for power supply, a measurement and control communication unit for monitoring the status of each unit, and a cooling system device for heat dissipation are also provided inside the cabin, wherein the low-voltage distribution unit and the measurement and control communication unit are integrated in the low-voltage cabinet 4.

[0030] In this embodiment, the energy storage converter 1 is responsible for connecting the energy storage battery and the low-voltage side of the step-up transformer 2 in the integrated cabin, and performs the energy storage bidirectional conversion function by executing the control commands of the measurement and control communication unit in the integrated machine, thereby realizing the charging and discharging of the energy storage battery.

[0031] The step-up transformer 2 is responsible for stepping up the low-voltage AC power output by the energy storage converter 1 and then connecting it to the grid through the grid-connected unit. Its integrated feature is that different built-in transformer modules can be selected according to the design requirements such as the capacity of the power station and the grid-connected voltage, thus realizing a flexible and convenient configuration scheme.

[0032] The high-voltage grid-connected unit 3 is responsible for connecting the energy storage power station and the power grid, and is a boundary device between the power station and the power grid.

[0033] The low-voltage power distribution unit is responsible for providing working power to the energy storage converter and booster, and can also provide power to external electrical equipment as needed.

[0034] The measurement and control communication unit is responsible for monitoring the operating status of each unit in the system, and completing the operation control of each unit in the system according to the changes in the power grid environment and downlink commands, while completing the communication of the uplink integrated machine operation data information;

[0035] The integrated cooling system device is composed of multiple cooling elements and is a system device used for efficient cooling and heat dissipation of an integrated cabin.

[0036] The energy storage converter 1 of this embodiment has a high fire protection level, so the energy storage converter 1 is set outside the cabin. In other embodiments, if the energy storage converter has a low fire protection level, the energy storage converter can be set inside the cabin, so that the energy storage converter can be cooled and dissipated by the cooling device inside the cabin to avoid safety accidents.

[0037] In this embodiment, the main circuit of the energy storage inverter and booster unit is as follows Figure 3 As shown, on the DC side of the energy storage inverter 1, it is connected to the energy storage battery of the energy storage power station. On the AC side of the energy storage inverter 1, it is connected to the low-voltage side of the step-up transformer 2. The high-voltage side of the step-up transformer 2 is incorporated into the power grid through the load switch fuse in the high-voltage grid connection unit 3. The energy storage inverter 1 converts the DC power of the energy storage battery into AC power, and then after being stepped up by the step-up transformer 2, it is incorporated into the power grid through the high-voltage grid connection unit 3.

[0038] The following further describes the present utility model in combination with the usage scenarios:

[0039] Step 1: Flexibly configure the integrated structural unit according to the designed capacity of the power station

[0040] Provide a standardized prefabricated base mechanism and recommend a reasonable foundation construction plan, which can meet the rapid design and construction response of the power station. Utilize the prefabricated base mechanism in the factory to integrally install the energy storage inverter 1 and the cabin body that meet the designed capacity of the power station. The integrated energy storage inverter 1 can be flexibly configured with multiple options such as a rated power of 2500kW - 3600kW according to reasonable technical economy. Inside the cabin, the step-up transformer 1 and the high-voltage grid connection unit 3 are flexibly configured according to different capacities and grid connection voltages.

[0041] Step 2: Complete the highly integrated design for each configuration unit in Step 1

[0042] As Figure 5 shown, in this embodiment, a copper busbar 6 is integrally connected between the AC side of the energy storage inverter 1 and the step-up transformer 2, improving the connection reliability and reducing the loss. Utilizing the integrated connection feature of the copper busbar 6, in the integrated design scheme, a scheme of integrating and sharing the transformer low-voltage circuit breaker and the AC grid connection circuit breaker of the energy storage inverter is realized, achieving reasonable technical safety while reducing the system equipment cost.

[0043] As Figure 6 shown, when the energy storage inverter and the step-up transformer are separately configured in the prior art, low-voltage circuit breakers (i.e., Figure 6 QF1 and QF2 in Figure 7 ) need to be set on both the AC side of the energy storage inverter and the low-voltage side of the step-up transformer, and the functions and parameters are repeated. After integration, only 1 low-voltage circuit breaker 7 is shared, as

[0044] shown. The AC side of the energy storage inverter 1 is connected to the low-voltage side of the step-up transformer 2 through the copper busbar 6. After being stepped up by the step-up transformer 2, it is connected to the high-voltage grid connection cabinet 3 through the main circuit copper busbar 5 of the grid connection unit. This connection path is smooth and saves space. At the same time, the low-voltage power distribution and measurement and control communication cabinet are integrated and set in the same cabinet to form the low-voltage cabinet 4, which can be more conveniently integrated with the entire integrated unit.

[0045] Step 3: Corresponding to the energy storage converter 1 and the step-up transformer 2 in Steps 1 and 2, configure and connect the corresponding module structure of the high-voltage grid connection unit 3 to safely connect the integrated machine system to the grid.

[0046] In this embodiment, the high-voltage grid connection unit 3 utilizes a protective detachable method to pre-install the high-voltage load switch fuse in the high-voltage grid connection unit 3 at the factory. To avoid damage to components during transportation and construction, the fuse body is removed by reserving the position of the load switch fuse.

[0047] In this embodiment, for the main circuit copper bar connecting the high-voltage side of the step-up transformer 2 to the high-voltage grid connection unit 3, that is, the main circuit copper bar 5 of the grid connection unit, a protective detachable integrated installation method is also adopted. After pre-installation at the factory, the copper bar body is removed by reserving the overlapping position. It not only realizes the integrated configuration of the connecting copper bar and the high-voltage fuse of the grid connection unit with different capacities, but also can protect components such as the main circuit overlapping copper bar during transportation and construction.

[0048] Specifically, the fuse body 8 on the load switch is provided with a fuse buckle 9, and both ends of the fuse are fixed by the fuse buckle 9. When the fuse is damaged, the fuse buckle 9 can be loosened to replace the fuse, as Figure 8 shown.

[0049] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still make modifications to the technical solutions recorded in the foregoing embodiments without creative efforts, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A modular energy storage inverter and boost integrated machine, comprising a base and an energy storage inverter located at one end of the base, characterized in that, At the other end of the base, there is a cabin for accommodating a step-up transformer and a grid connection unit. At one end of the cabin close to the energy storage converter, there is a step-up transformer with its low-voltage side connected to the AC side of the energy storage converter. At a position close to the other end of the base inside the cabin, there is a grid connection unit. The high-voltage side of the step-up transformer is connected to the main circuit copper busbar of the grid connection unit through a busbar.

2. The modular energy storage inverter and boost integrated machine according to claim 1, wherein The AC side of the energy storage converter and the low-voltage side of the step-up transformer are integrally connected through a copper busbar.

3. The modular energy storage inverter and step-up integrated machine according to claim 2, wherein, A circuit breaker for controlling the shutdown of the energy storage converter and the step-up transformer is provided on the copper busbar.

4. The modular energy storage inverter and step-up integrated machine according to claim 1, characterized in that, A low-voltage cabinet for integrating low-voltage equipment is also provided inside the cabin.

5. The modular energy storage inverter and boost integrated machine according to claim 1, characterized in that, The grid connection unit includes a load switch fuse for connecting to the high-voltage power grid, and the load switch fuse is detachably installed inside the cabin.

6. The modular energy storage inverter and boost integrated machine according to claim 5, characterized in that Clips are provided on the body of the load switch fuse, and the load switch fuse is fixed inside the cabin through the clips.

7. The modular energy storage inverter and step-up integrated machine according to claim 3, characterized in that, A measurement and control communication unit for monitoring the status of each unit is also installed inside the cabin.

8. The modular energy storage inverter and step-up integrated machine according to claim 7, characterized in that The low-voltage power distribution unit for providing voltage power and the measurement and control communication unit are integrated in the low-voltage cabinet.

9. The modular energy storage inverter and boost integrated machine according to claim 1, wherein, A cooling system device for heat dissipation is also installed inside the cabin.

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