High-power micro-grid distributed energy-balanced storage and charging two-way all-in-one machine

Abstract

The utility model provides a high-power micro-grid distributed energy-balanced storage and charging bidirectional all-in-one machine. The all-in-one machine comprises N parallel-operation coupled storage and charging devices and an EMS system. Each storage and charging device comprises a bidirectional AC / DC converter, a DC bus, a bidirectional DC / DC converter, a battery system and a charging gun; the battery system is connected in parallel to the direct current bus through the bidirectional DC / DC converter, one end of the bidirectional AC / DC converter is connected to a power grid, and the other end of the bidirectional AC / DC converter is connected to the direct current bus; the charging gun is connected to the direct current bus and is used for charging the new energy vehicle; the storage and charging devices are connected in series through direct current buses; the EMS system is in signal connection with the bidirectional AC / DC converter and the bidirectional DC / DC converter in each storage and charging device, and is used for controlling the energy output of the storage and charging device. According to the utility model, more economical peak load shifting, energy time shifting and system-level battery energy balance can be realized, and the effect of micro-grid energy scheduling is finally achieved.

Description

Technical Field

[0001] The utility model relates to the field of storage and charging, in particular to a high-power microgrid distributed storage and charging bidirectional integrated machine with balanced energy. Background Art

[0002] With the vigorous development of the new energy industry and the popular use of new energy vehicles, charging anxiety has always accompanied new energy vehicle users, and has also greatly restricted the activity area of new energy vehicles. In order to increase the market share of new energy vehicles, automobile and battery manufacturers have continuously increased the battery capacity. Even so, the restrictions on charging piles and charging time make it impossible for new energy vehicle owners to charge freely. At the same time, the use of a large number of new energy vehicles and concentrated charging during certain periods of time have caused a huge load impact on the existing power grid. Therefore, if the increasing charging demand is to be met, the existing power grid must be upgraded, and the upgrade of the power grid will face huge capital investment, but the use of charging piles is intermittent. Utility Model Content

[0003] In response to the problems existing in the existing technology, the utility model proposes a high-power microgrid distributed and energy-balanced bidirectional storage and charging integrated machine based on bidirectional DC / AC and DC / DC technologies, which can meet the fast charging and supercharging needs of commercial, remote areas, rural and other scenarios, and realize more economical energy scheduling and utilization through the characteristics of energy storage, thereby reducing the load on the power grid and reducing the pressure on the power grid.

[0004] The technical solution adopted by the utility model is as follows: a high-power microgrid distributed energy-balanced storage and charging bidirectional integrated machine, including N parallel-coupled storage and charging devices and an EMS system;

[0005] Each storage and charging device includes a bidirectional AC / DC converter, a DC bus, a bidirectional DC / DC converter, a battery system, and a charging gun. The battery system is connected in parallel to the DC bus via the bidirectional DC / DC converter. One end of the bidirectional AC / DC converter is connected to the power grid and the other end is connected to the DC bus. The charging gun is connected to the DC bus for charging new energy vehicles.

[0006] Each storage and charging device is connected in series via a DC bus;

[0007] The EMS system is respectively connected to the bidirectional AC / DC converter and the bidirectional DC / DC converter in each storage and charging device for signal control of the energy output mode of the storage and charging device.

[0008] As a preferred solution, the storage and charging device includes at least one bidirectional AC / DC converter, one end of which is connected to the power grid through a contactor, and the other end is connected to the DC bus; the contactor is connected to the EMS system signal, and the EMS system controls the bidirectional AC / DC converter to provide power output.

[0009] As a preferred solution, the DC bus connection between the storage and charging devices is completed through a DC bus contactor. The contactor is connected to the EMS system signal and is controlled by the EMS system to achieve battery energy balancing and scheduling.

[0010] As a preferred solution, the charging gun is connected to the DC bus through a contactor, and the contactor is connected to the EMS system signal, and the energy output is controlled by the EMS system.

[0011] As a preferred solution, the battery system further includes a BMS system for monitoring the battery status. The BMS system is signal-connected to the EMS system to upload the battery status.

[0012] As a preferred solution, it also includes a card swiping charging identification unit, which is connected to the EMS system signal for uploading charging information, and the EMS system controls the charging gun to output energy.

[0013] As a preferred solution, the charging gun is also connected to the EMS system signal for feedback information.

[0014] As a preferred solution, in the storage and charging equipment, the battery system, BMS system, and bidirectional DC / DC converter are modularized and directly connected in parallel to the DC bus.

[0015] As a preferred solution, the storage and charging device also includes an AC bus, which is connected to the power grid. One end of the bidirectional AC / DC converter is connected to the AC bus, and the other end is connected to the DC bus.

[0016] As a preferred solution, a contactor is provided between the AC bus and the power grid, and the contactor is connected to the EMS system signal for controlling the connection and disconnection of the power grid.

[0017] Compared with the existing technology, the beneficial effects of the present invention are: the present invention realizes more economical peak shaving and valley filling, energy time shifting, and system-level battery energy balancing through the energy storage characteristics of the storage and charging integrated machine, and finally achieves the effect of microgrid energy scheduling, plays a role in overloading the grid, reducing the pressure on the grid, improving battery utilization, and improving the utilization rate of charging equipment; at the same time, it increases the grid scheduling within the system microgrid and increases the utilization rate of the microgrid system's electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the composition of a high-power microgrid distributed energy-balanced storage and charging bidirectional integrated machine proposed in the utility model. DETAILED DESCRIPTION

[0019] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar modules or modules with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the present application include all changes, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0020] To meet the needs of fast charging, super charging, and V2G in commercial, remote, and rural areas, the present invention proposes a high-power microgrid distributed energy-balanced bidirectional storage and charging integrated device that can achieve charge and discharge control, charging mode (normal charging, fast charging, super fast charging) selection control, battery system balancing control, V2G control, etc. Specifically,

[0021] Please refer to Figure 1 The high-power microgrid distributed energy-balanced bidirectional storage and charging integrated device proposed in this embodiment includes N parallel-coupled storage and charging devices and an EMS system. Figure 1 Only four integrated storage and charging devices are shown, and in actual applications, they can be increased or reduced according to needs.

[0022] Each storage and charging device consists of a bidirectional AC / DC converter, a DC bus, a bidirectional DC / DC converter, a battery system, and a charging plug. The battery system is connected in parallel to the DC bus via the bidirectional DC / DC converter. One end of the bidirectional AC / DC converter is connected to the grid, and the other end is connected to the DC bus. The charging plug is connected to the DC bus to charge new energy vehicles.

[0023] Each storage and charging device is connected in series through a DC bus to form a microgrid system; the EMS system is respectively connected to the bidirectional AC / DC converter and bidirectional DC / DC converter signals in each storage and charging device to control the energy output mode of the storage and charging device.

[0024] For the bidirectional AC / DC converter in the storage and charging equipment, in this embodiment, a modular design is adopted. Its main function is to interconnect with the power grid, cooperate with the EMS system to realize peak shaving and valley filling, V2G functions, and realize energy interaction between the microgrid system and the power grid.

[0025] For the bidirectional DC / DC converter in the storage and charging equipment, in this embodiment, a modular design is adopted. Its main function is to interact with the energy between the battery and the DC bus. Through the control of the EMS, high-power supercharging is achieved through DC / DC conversion and multi-machine parallel connection, while reducing the impact on the power grid.

[0026] Through modular design, AC / DC, DC / DC, and other power modules can be quickly stacked to meet the industrial control needs of different scenarios. Furthermore, in one embodiment, the battery system components, including the battery pack, BMS system, high-voltage box, and bidirectional DC / DC converter, are modularized and directly connected in parallel to the DC bus, allowing for convenient expansion of the energy storage battery capacity based on specific system requirements.

[0027] To increase the power output of the storage device, in this embodiment, each storage device includes at least one bidirectional AC / DC converter. One end of each bidirectional AC / DC converter is connected to the grid via a contactor, and the other end is connected to the DC bus. The contactor is connected to the EMS system signal, and the EMS controls the bidirectional AC / DC converter to provide power output. In other embodiments, the number of bidirectional AC / DC converters can be increased to increase power output, and all bidirectional AC / DC converters can be controlled by the EMS system.

[0028] In this embodiment, the DC bus connection between the storage and charging devices is completed via a DC bus contactor. This DC bus contactor is connected to the EMS system signal and is controlled by the EMS system to achieve battery energy balancing and scheduling between different storage and charging devices. In this embodiment, the charging gun is connected to the DC bus via a contactor. This contactor is connected to the EMS system signal and the EMS system controls energy output. Furthermore, the battery system also includes a BMS system for monitoring battery status. The BMS system is connected to the EMS system signal and uploads battery status.

[0029] Based on the needs of different scenarios, the EMS system controls the closing of contactors between devices to achieve energy balancing between battery systems. Simultaneously, by controlling bidirectional AC / DC and DC / DC converters, microgrid energy scheduling can be achieved to meet user charging needs.

[0030] In one embodiment, the dual-function storage and charging device also includes a card-swipe charging identification unit that provides a charging solution. This card-swipe charging identification unit is connected to the EMS system signal to read and upload user information, and the EMS system controls the charging gun to output energy and charge. Furthermore, the charging gun is also connected to the EMS system signal to feedback charging information.

[0031] In one embodiment, the storage device further includes an AC busbar connected to the power grid. The bidirectional AC / DC converter is connected to the AC busbar at one end and to the DC busbar at the other. A contactor is provided between the AC busbar and the power grid. This contactor is connected to EMS signals to control grid connection and disconnection.

[0032] The integrated energy storage device proposed in this embodiment forms a microgrid through multiple sets of storage and charging equipment (2 or more): direct DC coupling of the battery systems and DC / AC converters in multiple storage and charging equipment is achieved through the contactors of each set of storage and charging equipment; the contactor opening and closing control is performed through the EMS system integrated in the microgrid to achieve energy balance of the battery systems between different storage and charging devices, realize energy flow between battery systems, and improve the utilization rate of the storage and charging devices; select power according to different charging modes, control the number of DC / AC converters and DC / DC converters in parallel, and realize normal charging, fast charging, super charging, V2G and other operating modes.

[0033] In order to better understand the energy storage integrated machine proposed in the present invention, various working modes are introduced one by one below.

[0034] ①Battery energy

[0035] Battery energy is controlled through the EMS system control strategy to achieve peak shaving and valley filling, and the battery system's charge and discharge control as well as battery balancing and scheduling are achieved through bidirectional DC / DC.

[0036] ②Normal charging

[0037] The system is controlled by EMS. During low-power consumption periods, the AC / DC module can directly charge the device. During peak power consumption periods, the DC / DC module can use the energy stored in the battery to charge the device.

[0038] ③Fast charging and ultra-fast charging

[0039] The system is controlled by EMS. During periods of low power consumption, a single AC / DC module and a DC / DC module can work simultaneously to charge the device, achieving high-power fast charging or ultra-fast charging. During peak power consumption periods, the contactors between adjacent storage and charging devices can be controlled to enable multi-stage parallel operation of DC / DC modules to work simultaneously to charge the device, achieving high-power ultra-fast charging.

[0040] ④Battery balancing

[0041] During peak electricity consumption periods, some storage and charging equipment are used multiple times, and due to the impact of electricity space (the rechargeable equipment is parked full), the EMS system controls the release of more electrical energy stored in some storage and charging equipment, and balances it to batteries with lower energy for storage, so as to achieve the effect of balancing the energy storage of multiple devices' batteries, thereby improving the utilization rate of the equipment.

[0042] ⑤V2G function

[0043] In special scenarios, the on-board power supply energy needs to interact with the microgrid. The energy can be stored in the battery system through a bidirectional DC / DC converter, or it can be output to the grid through a bidirectional AC / DC converter for powering other devices.

[0044] The high-power microgrid distributed energy-balanced bidirectional storage-charging integrated machine proposed in this utility model can meet the fast charging, super charging and V2G needs of commercial, remote areas and rural areas, and realize more economical peak shaving and valley filling, energy time shifting and system-level battery energy balancing through the characteristics of energy storage, and finally achieve the effect of microgrid energy scheduling, play the role of grid overloading, reducing grid pressure, improving battery utilization and improving the utilization rate of charging equipment; at the same time, it increases the grid scheduling within the system microgrid and increases the utilization rate of microgrid system electricity.

[0045] It should be noted that, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances; the drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0046] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A high-power microgrid distributed energy-balanced storage and charging bidirectional integrated device, characterized by: Includes N parallel-coupled storage and charging equipment and EMS system; Each storage and charging device includes a bidirectional AC / DC converter, a DC bus, a bidirectional DC / DC converter, a battery system, and a charging gun. The battery system is connected in parallel to the DC bus via the bidirectional DC / DC converter. One end of the bidirectional AC / DC converter is connected to the power grid and the other end is connected to the DC bus. The charging gun is connected to the DC bus for charging new energy vehicles. Each storage and charging device is connected in series via a DC bus; The EMS system is respectively connected to the bidirectional AC / DC converter and the bidirectional DC / DC converter in each storage and charging device for signal control of the energy output of the storage and charging device.

2. The high-power microgrid distributed energy-balanced storage and charging bidirectional integrated device according to claim 1 is characterized in that: The storage and charging equipment includes at least one bidirectional AC / DC converter, one end of which is connected to the power grid through a contactor, and the other end is connected to the DC bus; the contactor is connected to the EMS system signal, and the EMS system controls the bidirectional AC / DC converter to provide power output.

3. The high-power microgrid distributed energy-balanced storage and charging bidirectional integrated device according to claim 1 is characterized in that: The DC bus connection between the storage and charging devices is completed through a DC bus contactor. The DC bus contactor is connected to the EMS system signal and is controlled by the EMS system to achieve battery energy balancing and scheduling.

4. The high-power microgrid distributed energy-balanced bidirectional storage and charging integrated device according to claim 1 is characterized in that: The charging gun is connected to the DC bus through a contactor, and the contactor is connected to the EMS system signal, and the energy output is controlled by the EMS system.

5. The high-power microgrid distributed energy-balanced bidirectional storage and charging integrated device according to claim 1 is characterized in that: The battery system further includes a BMS system for monitoring battery status. The BMS system is signal-connected to the EMS system to upload the battery status.

6. The high-power microgrid distributed energy-balanced bidirectional storage and charging integrated device according to claim 1 is characterized in that: It also includes a card swiping charging identification unit, which is connected to the EMS system signal to upload charging information, and the EMS system controls the charging gun to output energy.

7. The high-power microgrid distributed energy-balanced bidirectional storage and charging integrated device according to claim 1 is characterized in that: The charging gun is also connected to the EMS system signal for feedback information.

8. The high-power microgrid distributed energy-balanced bidirectional storage and charging integrated device according to claim 5 is characterized in that: In the storage and charging equipment, the battery system, BMS system, and bidirectional DC / DC converter are modularized and directly connected in parallel to the DC bus.

9. The high-power microgrid distributed energy-balanced bidirectional storage and charging integrated device according to claim 1 is characterized in that: The storage and charging device also includes an AC busbar, which is connected to the power grid. One end of the bidirectional AC / DC converter is connected to the AC busbar, and the other end is connected to the DC busbar.

10. The high-power microgrid distributed energy-balanced bidirectional storage and charging integrated device according to claim 9, characterized in that: A contactor is provided between the AC bus and the power grid, and the contactor is connected to the EMS system signal for controlling the connection and disconnection of the power grid.

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