Split type mobile energy storage equipment for distribution network

Abstract

Aiming at the scene of mobile energy storage of a distribution network, the utility model discloses split type mobile energy storage equipment for the distribution network, which is used for realizing mobile application of an energy storage system of the distribution network, SVG (Static Var Generator) function of the distribution network and multifunctional use of a direct-current 400V charging pile. The energy storage inverter is integrated into the all-in-one machine and separated from the battery pack on the direct current side, the vehicle-mounted transport vehicle directly moves and transports the battery pack, and the all-in-one machine is arranged at a target site access point and installed on an overhead line pole in a suspended mode. A direct-current side wire of the energy storage inverter is connected with the direct-current capacitor CF2 through a switch KM1 and connected with a charging gun wiring port through a switch KM2, the energy storage inverter is connected with the direct-current capacitor in parallel, and multiple purposes are achieved through one machine. The flexibility of the mobile energy storage equipment is enhanced; the mobile energy storage equipment is easy to maintain and repair; the space utilization is optimized; electrical connection is realized on the direct current side, and the workload of field wiring is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronic converters, in particular to a split-type mobile energy storage device for distribution networks. Background Art

[0002] The low-voltage power distribution substation is responsible for the transmission and distribution of electric energy from the substation to the user in the power system. The quality of the power it supplies directly affects the quality of power consumption by users and the stability of the power grid. In order to improve power quality, the application of SVG compensation devices is particularly important.

[0003] Conventional low-voltage grid upgrades require large investments, long construction cycles, and limited flexibility. Mobile energy storage, a subcategory of energy storage equipment, offers significant application value in comprehensive power quality management within distribution substations due to its flexible configuration. Using mobile energy storage to improve power quality and reliability while addressing issues like three-phase imbalance and power factor is an emerging solution for power quality management.

[0004] Conventional mobile energy storage systems integrate the battery pack, BMS, and energy storage inverter into a closed box for transportation via vehicle. Upon arrival at the target site, the box is removed and connected to the distribution network, allowing the energy storage system to be charged and discharged. Unlike conventional mobile energy storage systems, which have variable target sites, distribution network target sites are relatively fixed and often live. Connecting mobile energy storage systems to distribution network access points after arrival presents security risks and is inconvenient. Summary of the Invention

[0005] To address the aforementioned technical issues, the present invention provides a split-type mobile energy storage device for distribution networks. To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is provided below. This summary is not intended to be a comprehensive review, identify key or important components, or delineate the scope of protection for these embodiments. Its sole purpose is to present some concepts in a simplified form, serving as a prelude to the detailed description that follows.

[0006] The utility model adopts the following technical solutions:

[0007] Provided is a split-type mobile energy storage device for distribution network, comprising: an energy storage inverter and a battery pack, wherein the energy storage inverter is integrated into an all-in-one device and is separated from the battery pack on the DC side;

[0008] The all-in-one device is arranged at a target site access point and is suspended on an overhead pole, and the battery pack is arranged on a vehicle-mounted transport vehicle;

[0009] The all-in-one device further includes: a charging gun wiring port, a switch KM1, a switch KM2 and a DC capacitor CF2. The DC side connection of the energy storage inverter is connected to the DC capacitor CF2 through the switch KM1, and is connected to the charging gun wiring port through the switch KM2.

[0010] Furthermore, the all-in-one machine also includes: a DC capacitor closing button for controlling the closing of switch KM1, a DC capacitor opening button for controlling the opening of switch KM1, a charging gun wiring port closing button for controlling the closing of switch KM2, and a charging gun wiring port opening button for controlling the opening of switch KM2.

[0011] Furthermore, the all-in-one machine also includes: a charging gun; the charging gun is connected to the charging gun wiring port.

[0012] Furthermore, the AC side of the energy storage inverter is connected to the substation transformer.

[0013] Furthermore, the all-in-one device also includes: a shell; the charging gun wiring port is arranged on the shell; the energy storage inverter, switch KM1, switch KM2 and DC capacitor CF2 are integrated into the interior of the shell.

[0014] Furthermore, the DC capacitor closing button, the DC capacitor opening button, the charging gun wiring port closing button and the charging gun wiring port opening button are arranged on the shell.

[0015] Furthermore, the distance between the all-in-one machine and the ground is 150 mm.

[0016] Beneficial effects brought about by the utility model:

[0017] 1. This application integrates the energy storage inverter into an all-in-one unit, which is separated from the battery pack on the DC side. The all-in-one unit is fixed at the target site access point, and the battery pack is directly transported by a vehicle-mounted transport vehicle. This reduces the transportation and wiring workload, improves system flexibility and maintenance convenience, and optimizes space utilization.

[0018] 2. This application designs a DC capacitor CF2 on the DC side of the all-in-one machine. By closing and opening the switch KM1 and the switch KM2, the mobile energy storage access function is realized when the battery pack is connected, and the SVG function is realized when no battery pack is connected. The DC charging pile function is realized through the charging gun wiring port to provide charging services for electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a structural diagram of a split-type mobile energy storage device for distribution network of the utility model;

[0021] Figure 2 This is a schematic diagram of the external structure of the all-in-one machine of the utility model;

[0022] Figure 3 This is a schematic diagram of the internal wiring of the all-in-one machine of the utility model;

[0023] Figure 4 This is the electrical diagram of the all-in-one machine of this utility model. DETAILED DESCRIPTION

[0024] The following describes the embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the embodiments described are only a portion of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0025] like Figure 1-4 As shown, for the scenario of mobile energy storage in distribution networks, the present application provides a split-type mobile energy storage device for distribution networks, which is used to realize the mobile application of the energy storage system of the distribution network, the multifunctional use of the distribution network SVG function and the DC 400V charging pile, specifically including: an all-in-one machine 3, an energy storage inverter 1 and a battery pack 2 arranged on a vehicle-mounted transport vehicle 4, which directly transports the battery pack 2.

[0026] The energy storage inverter 1 is integrated into the integrated machine 3 and separated from the battery pack 2 on the DC side. The integrated machine 3 is set at the target site access point and is suspended on the overhead pole 5.

[0027] The energy storage inverter 1 is a device that can absorb AC power from the grid or external power source and convert it into DC power for storage in the battery, and can also convert the DC power in the battery into AC power and feed it back to the grid or power the load. In this application, the energy storage inverter 1 is designed and installed in a multifunctional all-in-one machine 3, and is separated from the battery pack 2 on the DC side, that is, the energy storage inverter 1 and the battery pack 2 are physically separated in the DC circuit part and are spatially independent components. The all-in-one machine 3 is set at the target site access point, which refers to the grid access point at the target use location. In this application, the AC side of the energy storage inverter 1 is connected to the substation transformer.

[0028] During installation, the integrated device 3 is suspended and fixed to an overhead pole 4. Overhead poles 4 are poles used to support power lines and are typically made of wood, concrete, or metal. They are located at the target site access point. A suspension device, such as a hook or bracket, is installed on the overhead pole 4. Fasteners such as screws and bolts are then used to connect the suspension point of the integrated device 3 to the suspension device on the overhead pole 4.

[0029] The distance between the All-in-One 3 and the ground is 150 mm. This height provides a certain degree of dust and water resistance, protecting the All-in-One 3 from dust and splashing water. Suspended installation also facilitates air circulation, maintaining the heat dissipation of the All-in-One 3 and preventing overheating. Furthermore, the 150 mm height makes it easy for technicians to perform routine inspections and maintenance without the need for ladders or lifting equipment.

[0030] The integrated device 3 further includes: a charging gun connection port 301, a switch KM1, a switch KM2, a DC capacitor CF2, a charging gun 302, and an external control button. The charging gun connection port 301 is a 400V charging gun connection port.

[0031] Inside the all-in-one device, the DC side connection of the energy storage inverter 1 is connected to the DC capacitor CF2 through the switch KM1 and is connected to the charging gun connection port 301 through the switch KM2 , and the charging gun 302 is connected to the charging gun connection port 301 .

[0032] When the switch KM1 is in the closed state and the switch KM2 is in the open state, the DC side of the energy storage inverter 1 is connected to the DC capacitor CF2 to form an SVG electrical topology. At this time, the energy storage inverter 1 can operate as an SVG.

[0033] When the switch KM2 is in the closed state and the switch KM1 is in the open state, the DC side of the energy storage inverter 1 is connected to the charging gun 302. By setting the energy storage inverter 1, the charging gun 302 is connected to the battery pack 2 to form the electrical topology of the energy storage system. At this time, the energy storage system is running.

[0034] When the switch KM2 is in the closed state and the switch KM1 is in the open state, the DC side of the energy storage inverter 1 is connected to the charging gun 302. Inserting the charging gun 302 into the charging port of the electric vehicle 6 can realize the function of the DC charging pile and provide charging services for the electric vehicle.

[0035] The external control buttons include a DC capacitor closing button 303 for closing switch KM1, a DC capacitor opening button 304 for opening switch KM1, a charging connector connection port closing button 305 for closing switch KM2, and a charging connector connection port opening button 306 for opening switch KM2. These external control buttons enable switching between different functions, making the all-in-one device 3 multifunctional.

[0036] The integrated device 3 also includes a housing 307; a charging gun connection port 301 is provided on the housing 307; the energy storage inverter 1, switch KM1, switch KM2, and DC capacitor CF2 are integrated into the housing 307. A DC capacitor closing button 303, a DC capacitor opening button 304, a stun gun connection port closing button 305, and a charging gun connection port opening button 306 are also provided on the housing 307.

[0037] The present application designs a DC capacitor CF2 on the DC side of the energy storage inverter 1. When there is no battery pack 2 connected, the energy storage inverter 1 can realize the SVG function through the software function at the access point. When the switch KM1 is in the closed state and the switch KM2 is in the open state, the DC side of the energy storage inverter 1 is connected to the DC capacitor CF2 to form the SVG electrical topology. At this time, the energy storage inverter 1 can operate as an SVG. When the switch KM2 is in the closed state and the switch KM1 is in the open state, the DC side of the energy storage inverter 1 is connected to the charging gun 302. By setting the energy storage inverter 1, the charging gun 302 is connected to the battery pack 2 to form the electrical topology of the energy storage system. At this time, the energy storage system is running; inserting the charging gun 302 into the charging port of the electric vehicle 6 can realize the function of the DC charging pile and provide charging services for the electric vehicle. The use of multiple functions of one machine is realized, and the utilization rate of mobile energy storage equipment is improved.

[0038] Advantages of this application design:

[0039] 1. The split design makes the mobile energy storage equipment more flexible and easier to maintain and repair.

[0040] By separating the energy storage inverter 1 and battery pack 2 as independent modules, the system's flexibility and ease of maintenance are greatly enhanced. This allows for modular upgrades, facilitating maintenance and repair, while reducing repair costs due to individual component failures and improving cost-effectiveness. It also optimizes space utilization, particularly in space-constrained environments, while also improving environmental adaptability and allowing the selection of the most appropriate component configuration for varying environmental conditions.

[0041] 2. Realize electrical connection on the DC side to reduce the workload of on-site wiring.

[0042] Since the connection between the energy storage inverter 1 and the power grid is fixed, the need for on-site wiring is greatly reduced, which reduces the possibility of wiring errors and the wiring workload, thereby reducing material costs and labor costs.

[0043] 3. Energy storage inverter 1 is connected in parallel with DC capacitor CF2 to achieve multi-purpose use of one machine.

[0044] Using the energy storage inverter 1 as an SVG, achieving multiple uses in one device, can significantly improve the economics and efficiency of the energy storage system. This design not only reduces equipment procurement, installation, and maintenance costs, but also increases system integration and flexibility. Furthermore, the energy storage inverter 1, acting as an SVG, can quickly respond to the grid's reactive power demands, optimize power quality, reduce voltage fluctuations and flicker, and minimize harmonic content, thereby improving grid stability and reliability.

[0045] 4. Use charging gun wiring port to realize DC charging pile function.

[0046] In addition to realizing the functions of mobile energy storage access and SVG reactive compensation switching, the all-in-one device 3 can also provide high-power DC power through the 400V charging gun connection port 301, thereby providing charging services for electric vehicles.

[0047] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A split-type mobile energy storage device for distribution network, comprising: Energy storage inverter and battery pack, characterized in that the energy storage inverter is integrated into an all-in-one machine and is separated from the battery pack on the DC side; The all-in-one device is arranged at a target site access point and is suspended on an overhead pole, and the battery pack is arranged on a vehicle-mounted transport vehicle; The all-in-one device further includes: a charging gun wiring port, a switch KM1, a switch KM2 and a DC capacitor CF2. The DC side connection of the energy storage inverter is connected to the DC capacitor CF2 through the switch KM1, and is connected to the charging gun wiring port through the switch KM2.

2. A split-type mobile energy storage device for distribution network according to claim 1, characterized in that: The all-in-one device also includes: a DC capacitor closing button for controlling the closing of switch KM1, a DC capacitor opening button for controlling the opening of switch KM1, a charging gun wiring port closing button for controlling the closing of switch KM2, and a charging gun wiring port opening button for controlling the opening of switch KM2.

3. A split-type mobile energy storage device for distribution network according to claim 2, characterized in that: The all-in-one machine further includes: a charging gun; the charging gun is connected to the charging gun wiring port.

4. A split-type mobile energy storage device for distribution network according to claim 3, characterized in that: The AC side of the energy storage inverter is connected to the substation transformer.

5. A split-type mobile energy storage device for distribution network according to claim 4, characterized in that: The all-in-one device further includes: a housing; the charging gun connection port is provided on the housing; the energy storage inverter, switch KM1, switch KM2 and DC capacitor CF2 are integrated into the interior of the housing.

6. A split-type mobile energy storage device for distribution network according to claim 5, characterized in that: The DC capacitor closing button, the DC capacitor opening button, the charging gun wiring port closing button and the charging gun wiring port opening button are arranged on the shell.

7. A split-type mobile energy storage device for distribution network according to claim 6, characterized in that: The distance between the all-in-one machine and the ground is 150 mm.

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