CN106100053A - A kind of charging electric vehicle plug and play system configuring energy-storage battery - Google Patents

Abstract

The present invention provides an electric vehicle charging plug-and-play system configured with an energy storage battery, which includes a state monitoring unit, an energy management system, an energy storage battery, a fast charging pile, a photovoltaic system and a DC load; the energy storage battery, The DC load, the photovoltaic system and the fast charging pile are respectively connected to one side of the bidirectional converter module; the other side of the bidirectional converter is connected to a 220V AC grid. The technical scheme provided by the invention has a simple structure, and is convenient for realizing fast charging of electric vehicles; it realizes the demands of peak shaving and valley filling and fast charging of electric vehicles, and greatly improves power quality and reliability.

Description

A charging plug and play system for electric vehicles equipped with energy storage batteries

technical field

The invention relates to the field of energy storage and electric vehicles, in particular to an electric vehicle charging plug-and-play system equipped with energy storage batteries.

Background technique

With the favor of clean energy and the increasing attention of automobile emission control issues around the world, clean, environmentally friendly and energy-saving electric vehicles have gradually become a hot spot in the development of the world's automobile industry. According to my country's national conditions, the development of electric vehicles is imperative .

An electric vehicle is a vehicle that uses batteries as all or part of its power source. At present, the main factors restricting the development of the electric vehicle industry are: one is the battery itself, and the other is the charging method. As a necessary means of battery charging, the performance of the electric vehicle charger and the complexity of the process directly affect the promotion of electric vehicles and the service life of electric vehicle batteries.

With the development of battery technology, high-power fast charging system has become a current research hotspot. The high-power fast charging system can effectively shorten the charging time, improve the efficiency of electric vehicles, and promote the rapid development of electric vehicles. However, in the residential community where the small capacity of the household single-phase power grid cannot be expanded, the trip will occur when the power exceeds the threshold, and the high-power charging of the car is seriously affected. With the increase of the capacity of the electric car, the charging that takes more than ten hours is seriously restricted. The development of electric vehicles cannot meet the requirements of fast charging.

In order to meet the requirements of fast charging in the prior art, the present invention provides a plug-and-play system for charging an electric vehicle in a residential area equipped with an energy storage battery.

Contents of the invention

In order to meet the needs of residential quarters for the fast charging technology of electric vehicles and break through the limitation of single-phase power grids in households on the fast charging of electric vehicles, the present invention provides a plug-and-play system for charging electric vehicles equipped with energy storage batteries.

The electric vehicle charging plug-and-play system configured with an energy storage battery provided by the present invention is improved in that the plug-and-play system includes a state monitoring unit, an energy management system, an energy storage battery, a fast charging pile, and a photovoltaic system and DC loads;

The energy storage battery, the DC load, the photovoltaic system and the fast charging pile are respectively connected to one side of the bidirectional converter module;

The other side of the bidirectional converter is connected to a 220V AC grid.

Further, the bidirectional converter module includes an AC/DC converter module and a DC/DC converter module adopting a PEBB module structure;

The AC/DC converter module is a single-phase bridge IGBT; the AC/DC converter module is used to convert single-phase AC power and DC power;

The DC/DC converter module is a three-phase bridge IGBT.

Further, the energy storage battery is a cascade battery pack; the energy storage battery is connected to the DC bus between the AC/DC converter module and the DC/DC converter module.

Further, the energy storage battery includes a charging control module, an overvoltage and overcurrent protection module, and a metering module;

The charging control module determines the charging mode and controls the charging process;

The overvoltage and overcurrent protection module protects the DC charging unit and the external storage battery when an overvoltage and overcurrent phenomenon occurs during charging;

The metering module measures the remaining power of the storage battery in real time.

Further, the energy management system and the state monitoring unit are respectively connected to an AC power grid, an energy storage battery, a photovoltaic system, a fast charging pile, a DC load, and a bidirectional converter module.

Further, the state monitoring unit is used to collect real-time parameters at the incoming line of the AC power grid, the state of charge of the energy storage battery, the connection state of the electric vehicle and the charging pile, and the state information of the charging process, and transmit the monitoring state parameters through the communication unit , Receive control instructions, issue control commands.

Further, the energy management system receives the status information fed back by the status monitoring unit, and issues an energy control command to the plug-and-play system.

Further, the DC load, the photovoltaic system and the fast charging pile are respectively connected to a DC bus through a DC/DC converter module.

Compared with the closest prior art, the technical solution provided by the present invention has the following excellent effects:

1. The system structure of the technical solution provided by the present invention is simple and does not affect the network structure of the power grid; it is easy to install, does not need to add power grid lines, and does not require a lot of labor intensity; the addition of cascaded energy storage batteries realizes peak-shaving and valley-filling and The demand for fast charging of electric vehicles has greatly improved the power quality and reliability.

2. During the use of the plug-and-play system provided by the present invention, the established low-voltage DC power supply network provides DC power for the charging pile. The charging pile device does not require additional rectification and filtering modules, which reduces costs and simplifies the circuit structure. It can also reduce the failure rate, and by establishing a low-voltage DC power supply network, the number of AC-DC conversions is reduced, and the conversion efficiency and energy utilization rate are greatly improved.

Description of drawings

Fig. 1 is the configuration diagram of the electric vehicle charging plug-and-play system configuration of energy storage battery provided by the present invention;

Fig. 2 is a schematic structural diagram of a network diagram of an electric vehicle charging plug-and-play system equipped with an energy storage battery provided by the present invention.

detailed description

The invention introduces a plug-and-play system suitable for charging multiple electric vehicles in a residential area whose capacity cannot be expanded, and mainly solves the problem of rapid charging of electric vehicles for residents in the residential area under the condition that the electricity consumption capacity of the residential area cannot be expanded.

The electric vehicle charging station system uniformly built by the community, the AC 220V input line of the charging station can provide electric vehicles with slow charging; the charging station is equipped with a large-capacity step-by-step battery energy storage system and a photovoltaic power generation system, and the energy storage battery can store power grid and photovoltaic System power, and through its fast discharge characteristics to meet the demand for DC fast charging of electric vehicles; in addition, the photovoltaic power generation system can provide power to the community's public power facilities.

The system structure diagram of the present invention is shown in Figure 1, including: 220V AC power grid, cascade utilization battery energy storage system, photovoltaic power generation system, high-power AC/DC conversion device, multiple DC/DC conversion devices, energy management system, etc. .

The 220V AC power grid is a small-capacity non-expandable power grid in residential quarters, mostly single-phase power, and will trip if the power exceeds a threshold. The 220 AC power grid is directly connected to multiple slow charging piles, and is connected to a high-power AC/DC conversion device to form a DC power supply network.

The energy storage battery adopts a cascade battery, and the energy storage power station is uniformly established by the community, which is directly connected to the DC bus without going through a DC/DC conversion device. The electric vehicle is charged when it is not charging, and the energy storage battery play a major role.

The energy storage battery includes: a charging control module used to determine the charging mode and control the charging process; an overvoltage and overcurrent protection module used to protect the DC charging unit and the external storage battery when an overvoltage and overcurrent phenomenon occurs during the charging process; A metering module for real-time metering of battery SOC.

The state detection unit is connected to the incoming line of the AC grid in the residential area, the energy storage battery and the electric vehicle, and is used to collect real-time parameters such as voltage, current and power at the incoming line of the AC grid in the residential area, and to collect the SOC state information of the energy storage battery. As well as state information such as whether the electric vehicle is connected to the charging pile, charging completion, etc., through the communication unit, it is used for the transmission of various detection state parameters, and receives control instructions to control each unit.

The energy management system is connected to the AC power grid, energy storage power station, photovoltaic and various inverters, and controls the energy of each part of the entire system through the information fed back by the status monitoring unit to realize the rational use of energy.

The detailed structure of the system of the present invention is shown in Figure 2. The system includes: 220V AC power grid, cascaded battery energy storage system, photovoltaic power generation system, high-power AC/DC conversion device, and multiple DC/DC conversion devices. The 220V AC power grid is directly connected to multiple slow charging piles, and at the same time, it is rectified by a high-power AC/DC conversion device to output stable DC power, forming a DC power grid for its networking, and multiple DC/DC conversion devices are connected in parallel to the DC bus. The other side is connected to fast charging piles, solar panels and LED street lights. Among them, the AC/DC converter module and the DC/DC converter module are realized by PEBB structure. The AC/DC converter module uses a single-phase bridge converter, the DC/DC converter module uses a three-phase bridge converter, and the single-phase bridge PEBB module and its peripheral devices constitute a bidirectional AC/DC converter module. The grid-side inductance and capacitance realize the AC filtering function; the three-phase bridge PEBB module and its peripheral devices constitute a bidirectional DC/DC converter module, and the Buck or Boost mode can be selected through software parameter settings, and its peripheral inductance and capacitance realize the filtering function .

The energy storage battery uses the cascade battery to build an energy storage power station in the community. The energy storage battery is connected to the DC bus through the DC/DC converter, connected to the 220V AC grid through the DC/AC converter, and connected to the 220V AC grid through the DC/DC converter. Connected with fast charging piles and solar panels, the electric vehicle will be charged when it is not charging, and the energy storage battery will play a major role when the vehicle needs to be charged quickly. Through the cascade utilization method, not only can the service life of the battery be extended, the life-cycle cost of the power battery can be reduced, and the resource utilization of the waste power battery can be maximized. It can also supply power to important loads when the power grid fails, stabilize the randomness of charging behavior, and control the load. fluctuations and improve the power quality of the power grid.

LED street lamps are directly powered by the DC power grid, so LED street lamps do not need rectification and filtering modules. On the one hand, the structure of the street lamp is simplified and the cost is saved. It can solve the problem of the traditional street lamp rectifier being fragile, and on the other hand, it also avoids rectification inside the street lamp. energy loss in the process.

Electric vehicles can be directly charged with electric energy provided by the grid at a slow speed, or they can be charged quickly by borrowing energy storage batteries. Reasonable use.

The status monitoring unit monitors the status of the power grid, energy storage power station and electric vehicles in real time. The state monitoring unit monitors the input voltage and output voltage from the grid to the charging pile in real time, and monitors the state information of the energy storage battery in real time. When the charging pile is charging the electric vehicle, the state monitoring unit monitors the charging voltage, charging current and battery voltage of the electric vehicle in real time , and return the collected data such as charging voltage and charging current to the charging pile, so that the charging pile can determine whether to continue charging the battery.

The energy management system is connected to the AC power grid, energy storage power station, photovoltaic and various inverters, and controls the energy of each part of the entire system through the information fed back by the status monitoring unit to realize the rational use of energy.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still modify or equivalently replace the specific embodiments of the present invention. , any modifications or equivalent replacements that do not deviate from the spirit and scope of the present invention are within the protection scope of the claims of the present invention pending application.

Claims (8)

1. An electric vehicle charging plug-and-play system configured with an energy storage battery, characterized in that the plug-and-play system includes a state monitoring unit, an energy management system, an energy storage battery, a fast charging pile, a photovoltaic system and a DC load; The energy storage battery, the DC load, the photovoltaic system and the fast charging pile are respectively connected to one side of the bidirectional converter module; The other side of the bidirectional converter is connected to a 220V AC grid. 2. The plug and play system according to claim 1, wherein the bidirectional converter module comprises an AC/DC converter module and a DC/DC converter module adopting a PEBB module structure; The AC/DC converter module is a single-phase bridge IGBT; the AC/DC converter module is used to convert single-phase AC power and DC power; The DC/DC converter module is a three-phase bridge IGBT. 3. The plug and play system according to claim 1, wherein the energy storage battery is a cascade battery pack; the energy storage battery and the AC/DC converter module and the DC/DC converter module The DC bus connection between them. 4. The plug and play system according to claim 3, wherein the energy storage battery includes a charging control module, an overvoltage and overcurrent protection module, and a metering module; The charging control module determines the charging mode and controls the charging process; The overvoltage and overcurrent protection module protects the DC charging unit and the external storage battery when an overvoltage and overcurrent phenomenon occurs during charging; The metering module measures the remaining power of the storage battery in real time. 5. The plug-and-play system according to claim 1, wherein the energy management system and the state monitoring unit are respectively connected to the AC power grid, energy storage battery, photovoltaic system, fast charging pile, DC load and two-way Converter module connection. 6. The plug and play system according to claim 5, wherein the state monitoring unit is used to collect real-time parameters at the incoming line of the AC power grid, the state of charge of the energy storage battery, and the connection between the electric vehicle and the charging pile Status, status information of the charging process, and transmit monitoring status parameters, receive control commands, and issue control commands through the communication unit. 7. The plug-and-play system according to claim 5, wherein the energy management system receives the status information fed back by the status monitoring unit, and issues an energy control command to the plug-and-play system. 8. The plug-and-play system according to claim 1, wherein the DC load, the photovoltaic system and the fast charging pile are respectively connected to a DC bus through a DC/DC converter module.