CN218805329U - Vehicle-mounted charging and discharging device based on V2G - Google Patents

Abstract

The utility model relates to the technical field of power distribution networks, and discloses a V2G-based vehicle-mounted charging and discharging device, which comprises a vehicle-mounted V2X emergency power supply, wherein the vehicle-mounted V2X emergency power supply mainly comprises a human-computer interaction unit, a power control unit and a grid-connected and off-grid switching unit, the human-computer interaction unit is connected with the input end of the power control unit, and the output end of the power control unit is connected with the input end of the grid-connected and off-grid switching unit; the defects of complex structure, high cost and low efficiency of the traditional bidirectional converter circuit in the V2G technology are overcome, and the requirements of two working modes of the same circuit are met.

Description

A vehicle charging and discharging device based on V2G

technical field

The utility model relates to the technical field of power distribution networks, in particular to a vehicle-to-vehicle charging and discharging device based on V2G (Vehicle-to-grid, electric vehicle-to-grid interactive technology).

Background technique

At present, the grid-connected devices are generally photovoltaic power generation, wind power generation and other micro-grid power generation or energy storage devices. New energy power generation devices have high input costs and are greatly affected by climate and environmental factors. The construction of new energy power generation devices and energy storage devices The characteristics determine that it cannot meet the needs of mobility and portability. At present, there is a need for fast grid-connected access devices with low cost and high portability. In the traditional application mode, since most 0.4kV emergency power vehicles do not have the function of paralleling the machine and grid, the following situations will be faced in the application: ① When the emergency power vehicle connects to and exits the user-side busbar Force users to experience multiple short-term power outages; ②The access of emergency power supply vehicles can only shorten the user’s power outage time during the sudden power failure of the mains; ③When carrying out complex projects such as replacing user transformers without power failure, the use of emergency power supply vehicles is limited.

It can be seen that in the prior art, it is difficult to realize the bidirectional electric energy conversion between the power grid and the vehicle battery, and a low-cost, high-portability fast grid-connection access device is urgently needed to meet the demand for fast grid-connection of low-voltage overhead lines.

Utility model content

The utility model provides a vehicle-mounted charging and discharging device based on V2G to solve the problems existing in the prior art.

In order to achieve the above object, the utility model is achieved through the following technical solutions:

The utility model provides a vehicle-mounted charging and discharging device based on V2G, including: a vehicle-mounted V2X emergency power supply, the vehicle-mounted V2X emergency power supply is mainly composed of three parts: a human-computer interaction unit, a power control unit, and an off-grid switching unit. The human-computer interaction unit is connected to the input end of the power control unit, and the output end of the power control unit is connected to the input end of the on-grid switching unit.

Optionally, the human-computer interaction unit is mainly composed of a smart meter, a card reader, and a display screen, and the smart meter, card reader, and the display screen are all connected to the power control unit.

Optionally, the power control unit is mainly composed of a V2G power module, a control board, a communication board, an auxiliary power supply, a control protection unit, and a background communication. The background communication is connected to the communication board through a network, and the card reader It is connected with the communication board, and the V2G power module, the communication board, the auxiliary power supply, and the control and protection unit are all connected with the control board.

Optionally, the on-grid and off-grid switching unit is used to realize the automatic on-grid and off-grid switching function of charging and discharging.

Optionally, a V2G charging and discharging machine is also included, the V2G charging and discharging machine is connected to the vehicle-mounted V2X emergency power supply, and the V2G charging and discharging machine includes a parallel front-stage bidirectional AC/DC converter and a rear-stage bidirectional DC/DC converter.

Optionally, the V2G charging and discharging machine further includes a charging and discharging module, the output end of the charging and discharging module is connected to the battery-side converter.

Optionally, the V2G charging and discharging motor further includes a grid-side controller, and the grid-side controller adopts a double closed-loop control mode of a voltage outer loop and a current inner loop.

Beneficial effect:

The vehicle-mounted charging and discharging device based on V2G provided by the utility model includes a vehicle-mounted V2X emergency power supply, and the vehicle-mounted V2X emergency power supply is mainly composed of three parts: a human-computer interaction unit, a power control unit, and an off-grid switching unit. The human-computer interaction unit is connected to the input end of the power control unit, and the output end of the power control unit is connected to the input end of the on-grid and off-grid switching unit; it overcomes the complex structure and cost of the traditional bidirectional converter circuit in V2G technology The shortcomings of high efficiency and low efficiency have realized the requirement of running two working modes in the same circuit.

Description of drawings

Fig. 1 is the structural diagram of the overall control scheme of the preferred embodiment of the utility model;

Fig. 2 is the functional block diagram of the preferred embodiment of the utility model;

Fig. 3 is the system topology diagram of the preferred embodiment of the utility model;

Fig. 4 is a wiring diagram of the primary and secondary systems of the preferred embodiment of the present invention.

Detailed ways

The technical solution of the utility model is clearly and completely described below, obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Unless otherwise defined, the technical terms or scientific terms used in the utility model shall have the usual meanings understood by those with ordinary skills in the field to which the utility model belongs. "First", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Likewise, words like "a" or "one" do not denote a limitation in quantity, but indicate that there is at least one. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right" and so on are only used to indicate the relative positional relationship. When the absolute position of the described object changes, the relative positional relationship also changes accordingly.

Please refer to Figures 1-4, a V2G-based vehicle charging and discharging device provided by this application includes: a vehicle-mounted V2X emergency power supply, the vehicle-mounted V2X emergency power supply is mainly composed of a human-computer interaction unit, a power control unit, and an off-grid switch The unit consists of three parts, the human-computer interaction unit is connected to the input end of the power control unit, and the output end of the power control unit is connected to the input end of the on-grid switching unit.

The above-mentioned V2G-based vehicle charging and discharging device includes a vehicle-mounted V2X emergency power supply, and the vehicle-mounted V2X emergency power supply is mainly composed of three parts: a human-computer interaction unit, a power control unit, and an off-grid switching unit. The human-computer interaction The unit is connected to the input end of the power control unit, and the output end of the power control unit is connected to the input end of the on-grid and off-grid switching unit; it overcomes the complex structure, high cost and high efficiency of the traditional bidirectional converter circuit in V2G technology Low disadvantage, to achieve the requirements of the same circuit running two working modes.

Optionally, the human-computer interaction unit is mainly composed of a smart meter, a card reader, and a display screen, and the smart meter, card reader, and the display screen are all connected to the power control unit.

In this embodiment, the human-computer interaction unit is used to set charging and discharging management, billing management, system parameter setting, user management and other functions.

Optionally, the power control unit is mainly composed of a V2G power module, a control board, a communication board, an auxiliary power supply, a control protection unit, and a background communication. The background communication is connected to the communication board through a network, and the card reader It is connected with the communication board, and the V2G power module, the communication board, the auxiliary power supply, and the control and protection unit are all connected with the control board.

In this embodiment, the power control unit mainly completes the start-up, operation, real-time monitoring and stop of the charging and discharging process, and at the same time collects vehicle-mounted BMS data, power module input and output data, and can send the data to the background in real time through various communication methods.

Optionally, the on-grid and off-grid switching unit is used to realize the automatic on-grid and off-grid switching function of charging and discharging.

Optionally, a V2G charging and discharging machine is also included, the V2G charging and discharging machine is connected to the vehicle-mounted V2X emergency power supply, and the V2G charging and discharging machine includes a parallel front-stage bidirectional AC/DC converter and a rear-stage bidirectional DC/DC converter.

In this embodiment, the pre-stage bidirectional AC/DC converter and the post-stage bidirectional DC/DC converter of the V2G charging and discharging motor are relatively independent, and they have different goals to be achieved, and can be controlled separately.

Optionally, the V2G charging and discharging machine further includes a charging and discharging module, the output end of the charging and discharging module is connected to the battery-side converter.

Optionally, the V2G charging and discharging motor further includes a grid-side controller, and the grid-side controller adopts a double closed-loop control mode of a voltage outer loop and a current inner loop.

Among them, the charging and discharging module adopts the hysteresis loop comparison control method. By comparing the real-time detected voltage and current with the given value, the hysteresis loop output controls the duty ratio of the battery side converter to achieve constant current, constant voltage charging and parallel charging. Boost chopper transformation for grid time; the grid side controller adopts a double closed-loop control method of voltage outer loop and current inner loop to realize the charging adaptation and grid-connected inverter of the grid-side converter. The utility model overcomes the disadvantages of complex structure, high cost and low efficiency of the traditional bidirectional current conversion circuit in the V2G technology, and realizes the requirement of the same circuit running two working modes.

This device mainly realizes the following functions: electric vehicle charging function, emergency power supply function, virtual power plant function:

The charging function of electric vehicles is mainly undertaken by the portable integrated charging and discharging control system. It must be able to communicate with the on-board BMS and monitor BMS data. This function is the basic function, and it has the highest priority to avoid deflagration and explosion of electric vehicles.

The emergency power supply function is mainly undertaken by the electric vehicle emergency power supply monitoring APP. On the basis of meeting the demand guarantee function of the electric vehicle BMS, according to the needs of the power grid side or the user side that need power protection, a control strategy is formulated to control the portable integrated charger. The discharge control system discharges according to the instruction.

With the function of virtual power plant, it can also be used as a virtual power plant to participate in the virtual peak-shaving and peak-shaving work on the grid side, just like the emergency/guaranteed power supply of electric vehicles.

When it is necessary to charge the electric vehicle, the AC mains power is transformed into 200-750VDC power by the on-board V2X emergency power supply to charge the on-board battery; when emergency AC power supply is required, the electric energy stored in the on-board battery system is converted into 380Vac/220Vac by the on-board V2X emergency power supply AC power to AC microgrid (V2G) or AC equipment (V2L).

The preferred specific embodiments of the present utility model have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the utility model without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection defined by the claims .

Claims (7)

1. A vehicle-mounted charging and discharging device based on V2G, characterized in that it includes: a vehicle-mounted V2X emergency power supply, the vehicle-mounted V2X emergency power supply is composed of three parts: a human-computer interaction unit, a power control unit, and an off-grid switching unit. The human-computer interaction unit is connected to the input end of the power control unit, and the output end of the power control unit is connected to the input end of the on-grid switching unit. 2. The vehicle charging and discharging device based on V2G according to claim 1, wherein the human-computer interaction unit is composed of a smart meter, a card reader, and a display screen, and the smart meter, the card reader, and the The display screens are all connected to the power control unit. 3. The V2G-based vehicle charging and discharging device according to claim 2, wherein the power control unit is composed of a V2G power module, a control board, a communication board, an auxiliary power supply, a control protection unit, and a background communication unit, and the The background communication is connected to the communication board through the network, the card reader is connected to the communication board, and the V2G power module, the communication board, the auxiliary power supply, and the control and protection unit are all connected to the control board. 4. The V2G-based on-vehicle charging and discharging device according to claim 1, wherein the on-grid and off-grid switching unit is used to realize the automatic on-grid and off-grid switching function of charging and discharging. 5. The vehicle-mounted charging and discharging device based on V2G according to claim 1, further comprising a V2G charging and discharging machine, the V2G charging and discharging machine is connected to the vehicle-mounted V2X emergency power supply, and the V2G charging and discharging machine includes Parallel-connected pre-stage bidirectional AC/DC converter and post-stage bidirectional DC/DC converter. 6 . The V2G-based vehicle charging and discharging device according to claim 5 , wherein the V2G charging and discharging machine further includes a charging and discharging module, and an output terminal of the charging and discharging module is connected to a battery-side converter. 7. The vehicle charging and discharging device based on V2G according to claim 5, characterized in that, the V2G charging and discharging machine also includes a grid-side controller, and the grid-side controller adopts a dual voltage outer loop and a current inner loop. Closed-loop control method.

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