A direct-current bus-based energy storage charging device

Abstract

The utility model relates to a kind of energy storage charging device based on DC bus, belong to charging device technical field, including at least one box-type transformer, at least one AC / DC rectifier cabinet, at least one energy storage battery pack, DC bus and at least one charging pile group, the box-type transformer becomes 380V alternating current after grid current and the AC / DC rectifier cabinet electric connection, the AC / DC rectifier cabinet with the DC bus electric connection, the energy storage battery pack with the DC bus is electrically connected by relay control unit, the charging pile group with the DC bus electric connection.This application is by the full use of valley electricity period and the adjustment of peak electricity period, system can significantly improve the utilization of grid resources.

Description

Technical Field

[0001] This utility model relates to the field of charging devices, and in particular to an energy storage charging device based on a DC bus. Background Technology

[0002] With the increasing demand for electric vehicle charging, traditional AC bus charging systems suffer from problems such as low energy conversion efficiency, significant impact on the power grid, and a large number of prefabricated substations and other equipment. Furthermore, traditional systems are insufficient in utilizing peak and off-peak electricity rates, making it difficult to achieve high efficiency, energy saving, and environmental protection. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides an energy storage and charging device based on a DC bus to solve the problems mentioned in the background art.

[0004] To achieve the above-mentioned utility model objectives, this utility model provides an energy storage and charging device based on a DC bus, including at least one box-type transformer, at least one AC / DC rectifier cabinet, at least one energy storage battery pack, a DC bus, and at least one charging pile group. The box-type transformer converts the grid current into 380V AC power and is electrically connected to the AC / DC rectifier cabinet. The AC / DC rectifier cabinet is electrically connected to the DC bus. The energy storage battery pack is electrically connected to the DC bus through a relay control unit. The charging pile group is electrically connected to the DC bus.

[0005] Furthermore, the model of the box-type transformer is SCB11-800kVA, and its short-circuit impedance Uk% = 6.

[0006] Furthermore, the energy storage battery pack is a lead-acid battery pack, and the energy storage battery pack is an 800kWh or 6000kWh battery.

[0007] Furthermore, the charging pile group is electrically connected to the DC bus via a DC-DC unit.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] The technical solution of this application can make efficient use of power grid resources. By making full use of off-peak electricity periods and adjusting peak electricity periods, the system can significantly improve the utilization rate of power grid resources.

[0010] This application uses a lead-acid battery energy storage unit, which has high energy conversion efficiency and low environmental impact. Attached Figure Description

[0011] Figure 1 This is a structural block diagram of an embodiment of the present utility model. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. The embodiments of this utility model are described below with reference to the accompanying drawings.

[0013] like Figure 1 As shown, an energy storage and charging device based on a DC bus includes a first box-type transformer 1, a second box-type transformer 2, wherein the first box-type transformer 1 is equipped with a first dynamic reactive power compensation device, and the second box-type transformer 2 is equipped with a second dynamic reactive power compensation device. It also includes a first AC / DC rectifier cabinet 3, a second AC / DC rectifier cabinet 4, a DC bus 7, a first energy storage battery pack 5, a second energy storage battery pack 6, and several charging pile groups 10. The first box-type transformer 1 converts the grid current into 380V AC power and connects it to the first AC / DC rectifier cabinet 3. The second box-type transformer 2 converts the grid current into 380V AC power and connects it to the second AC / DC rectifier cabinet 4. The 380V AC power is converted to DC power by the first AC / DC rectifier cabinet 3 and the second AC / DC rectifier cabinet 4 and then transmitted to the DC bus 7. The DC bus 7 supplies power to the charging pile groups 10 and can also charge the first energy storage battery pack 5 and the second energy storage battery pack 6 respectively. The first energy storage battery pack 5 and the second energy storage battery pack 6 are respectively controlled by a relay control unit 8. The relay control unit 8 is electrically connected to the DC bus 7 and is used to control the connection and disconnection of the first energy storage battery pack 5, the second energy storage battery pack 6 and the DC bus 7. During off-peak hours, the power grid provides the DC bus 7 with full power and stable supply through the first box-type transformer 1 and the second box-type transformer 2. At this time, the relay control unit 8 is disconnected. During peak hours, the power grid is not used, so the relay control unit 8 is connected and supplies power to the DC bus 7 through the first energy storage battery pack 5 and the second energy storage battery pack 6. The technical solution of this application can efficiently utilize the peak and off-peak power of the power grid. During off-peak hours, the power grid provides the DC bus 7 with full power and stable supply through the first AC / DC rectifier cabinet 3 and the second AC / DC rectifier cabinet 4. During peak hours, the power grid is not used, but the first energy storage battery pack 5 and the second energy storage battery pack 6 are used to supply power. The first energy storage battery pack 5, the first AC / DC rectifier cabinet 3 and the relay control unit 8 are connected through CAN communication. The second energy storage battery pack 6, the second AC / DC rectifier cabinet 4 and the relay control unit 8 are connected through CAN communication to realize the automatic control of the entire system.

[0014] This application is based on a system design using DC bus 7, which has higher system efficiency than the current AC bus charging pile system; the energy storage battery pack acts as a capacitor in the system, without impacting or disturbing the power grid; the off-peak electricity utilization rate is nearly 100%, and there is no need to expand the power grid supply capacity; it can save resources, and can reduce the configuration of power grid equipment such as transformer substations by half under the same charging demand.

[0015] The model of the box-type transformer is SCB11-800kVA, and its short-circuit impedance Uk% = 6.

[0016] The energy storage battery pack is a lead-acid battery pack, which is 800KWh or 6000KWh. It uses recyclable lead-acid batteries as energy storage units to promote energy conservation, environmental protection and recycling. The output voltage of the energy storage battery pack is 600-800V.

[0017] A DC-DC unit 9 is provided between the charging pile group 10 and the DC bus 7. The DC-DC unit 9 is used to control the voltage of the charging pile and adjust the voltage of the DC bus 7 to a voltage suitable for the charging pile.

[0018] The box-type transformer is equipped with a reactive power dynamic compensation controller to monitor and control the reactive power in the power grid in real time, so as to improve power quality, reduce network losses and improve the power supply environment.

[0019] The technical solution of this application has the following advantages:

[0020] Efficient utilization of power grid resources: By making full use of off-peak electricity periods and regulating peak electricity periods, the system can significantly improve the utilization rate of power grid resources;

[0021] Environmental attributes: It adopts lead-acid battery energy storage unit, which has high energy conversion efficiency and low environmental impact.

[0022] The technical solution of this utility model has been described above with reference to specific embodiments. However, it should be noted that the above description is only for explaining the solution of this utility model and should not be construed as a specific limitation on the scope of protection of the utility model in any way. Based on this explanation, other specific embodiments or equivalent substitutions of this utility model that can be conceived by those skilled in the art without creative effort will all fall within the scope of protection of this utility model.

Claims

1. A DC bus-based energy storage and charging device, characterized in that, It includes at least one box-type transformer, at least one AC / DC rectifier cabinet, at least one energy storage battery pack, a DC bus, and at least one charging pile group. The box-type transformer converts the grid current into 380V AC power and is electrically connected to the AC / DC rectifier cabinet. The AC / DC rectifier cabinet is electrically connected to the DC bus. The energy storage battery pack is electrically connected to the DC bus through a relay control unit. The charging pile group is electrically connected to the DC bus.

2. The energy storage and charging device based on a DC bus according to claim 1, characterized in that, The box-type transformer is model SCB11-800kVA, and its short-circuit impedance Uk% = 6.

3. The energy storage and charging device based on a DC bus according to claim 1, characterized in that, The energy storage battery pack is a lead-acid battery pack, and the energy storage battery pack is an 800kWh or 6000kWh battery.

4. The energy storage and charging device based on a DC bus according to claim 1, characterized in that, The charging pile group is electrically connected to the DC bus via a DC-DC unit.

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