CN106026322B - Control method of electric vehicle charging plug-and-play system with energy storage battery - Google Patents
Control method of electric vehicle charging plug-and-play system with energy storage battery Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention provides a control method of an electric automobile charging plug-and-play system configured with an energy storage battery, which comprises the following steps: the method comprises the steps of acquiring direct current, forming a low-voltage direct current power supply network, and determining whether the electric automobile needs to be quickly charged according to the electric quantity of a household single-phase power grid and the charge state of an energy storage battery. The technical scheme provided by the invention simplifies the structure and reduces the failure rate, reduces the times of alternating current-direct current conversion by establishing the low-voltage direct current power supply network, greatly improves the conversion efficiency, shortens the charging time, improves the energy utilization rate and reduces the device cost.
Description
Technical Field
The invention relates to the field of electric automobiles and energy storage, in particular to a control method of an electric automobile charging plug-and-play system with an energy storage battery.
Background
With the global favor of clean energy and the increasing attention on the problem of controlling automobile emission, clean, environment-friendly and energy-saving electric automobiles become the hot spot of the development of the automobile industry in the world.
An electric automobile mainly uses a battery as a whole or partial power source. At present, the main factors restricting the development of the electric automobile industry are as follows: the first is the battery itself, and the second is the charging mode. The performance and the process complexity of the electric vehicle charger, which are necessary means for charging the battery, directly affect the popularization of the electric vehicle and the service life of the battery of the electric vehicle.
With the development of battery technology, high-power fast charging systems become a current research hotspot. By adopting the high-power quick charging system, the charging time can be effectively shortened, the service efficiency of the electric automobile is improved, and the quick development of the electric automobile can be promoted. However, in a residential user community with a small capacity of a household single-phase power grid, when the power exceeds a threshold value, tripping can occur, high-power charging of an automobile is restricted, and with the increase of the capacity of the electric automobile, the requirement of rapid charging cannot be met at all under the condition that the full charging takes more than ten hours.
In order to meet the requirement of rapid charging in the prior art, the invention provides a plug-and-play control method for charging of electric automobiles in residential communities with energy storage batteries.
Disclosure of Invention
In order to meet the requirement of residential communities on the electric vehicle quick charging technology and break through the limitation of a household single-phase power grid on the electric vehicle quick charging, the invention provides a control method of an electric vehicle charging plug-and-play system with an energy storage battery.
The improvement of the plug and play system control method provided by the invention is that the control method comprises the following steps:
(1) acquiring direct current;
(2) forming a low-voltage direct-current power supply network;
(3) it is determined whether to charge quickly.
Further, in the step (1), the AC mains supply provided by the household single-phase power grid is rectified and filtered by the AC/DC converter module and the DC/DC converter module to obtain the DC power.
Further, in the step (2), the networking mode of the low-voltage direct-current power supply network is as follows:
an energy storage battery is connected between the AC/DC conversion module and the DC/DC conversion module;
and a direct current load, a rapid charging pile and a photovoltaic system are connected behind each DC/DC conversion module.
Further, the energy storage battery comprises a echelon battery pack;
incorporating the photovoltaic system power generation into a low voltage dc supply grid; or the like, or, alternatively,
storing electric energy generated by the photovoltaic system in an energy storage battery;
the low-voltage direct-current power supply network provides direct current for the LED street lamps of the lighting units and the rapid charging piles contained in the direct-current loads.
Further, in the step (3), when the state of charge SOC of the battery pack in the echelon is less than 0.2, the state of charge is:
i. when the electric quantity of the household single-phase power grid is sufficient, the household single-phase power grid and the photovoltaic system charge the electric automobile and simultaneously charge the echelon battery pack;
ii. When the electric quantity of the household single-phase power grid is insufficient, the electric automobile is charged only through the photovoltaic system.
Further, in the step (3), when the state of charge of the battery pack in the echelon is more than 0.2 and less than SOC and less than 0.8, the state of charge is:
i. when the household single-phase power grid is sufficient in electric quantity: when the automobile is charged, the household single-phase power grid and the energy storage battery jointly provide electric energy; if the automobile does not need to be charged, the household single-phase power grid and the photovoltaic system charge the echelon battery pack;
ii. When the household single-phase power grid is insufficient in electric quantity: when the automobile is charged, the automobile is charged through the energy storage battery; and if the automobile does not need to be charged, the energy storage battery feeds back electric energy to the household single-phase power grid.
Further, in the step (3), when the SOC of the battery pack in the echelon is greater than 0.8, the state of charge is:
i. when the electric quantity of the household single-phase power grid is sufficient, the household single-phase power grid and the energy storage battery jointly charge the electric automobile;
ii. When the electric quantity of the household single-phase power grid is insufficient, the energy storage battery charges the electric automobile and discharges the household single-phase power grid at the same time.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
1. the energy storage battery in the technical scheme provided by the invention utilizes the echelon battery, the service life of the battery is prolonged, the whole life cycle cost of the power battery is reduced, the resource utilization maximization of the waste power battery is realized, the power is supplied to an important load when the power grid fails, the randomness of the charging behavior is stabilized, the load fluctuation is controlled, and the power quality of the power grid is improved.
2. According to the technical scheme provided by the invention, the energy storage battery is added, so that when the electric automobile is not charged, the energy storage battery can be charged to a household single-phase power grid or a photovoltaic system; when needs are fast to the car and are filled, the energy storage battery plays the primary role, realizes the demand of filling fast to when having a power failure or electric automobile is idle, the energy storage battery and the electric automobile of direct current power supply network side can provide the electric energy to resident's power consumption, realize the rational utilization of the energy.
3. According to the technical scheme provided by the invention, a direct-current power supply is provided for the charging pile based on the established low-voltage direct-current power supply network, the charging pile device does not need an additional rectifying and filtering module, the structure is simplified, the failure rate can be reduced, and the alternating-current and direct-current conversion times can be reduced by establishing the low-voltage direct-current power supply network, so that the conversion efficiency is greatly improved, the charging time is greatly shortened, the energy utilization rate is improved, and the device cost is reduced.
Drawings
FIG. 1 is a diagram of a residential electric vehicle charging system configured with energy storage batteries;
fig. 2 is a charging control method of an electric vehicle of a residential area configured with an energy storage battery.
Detailed Description
The technical scheme of the invention is described in detail and clearly in the following description in combination with the accompanying drawings.
The invention provides a residential area electric vehicle charging plug-and-play control method with an energy storage battery, wherein a networking diagram of a plug-and-play system is shown in fig. 1, a power grid in the control function is a residential area small-capacity non-expandable power grid, incoming lines are single-phase electricity, and tripping is caused when the power exceeds a threshold value. The direct current power supply system comprises an alternating current mains supply, a rectification filter module, a direct current load, a rapid charging pile and a photovoltaic system, wherein the rectification filter module is connected with the DC load, such as an LED lamp, the rapid charging pile and the photovoltaic system, a direct current power supply network is formed, direct current is provided for a charging pile device and an energy storage battery which are connected, electric energy generated by new energy power generation can be incorporated into the direct current power supply network, and the new energy is mainly solar energy generated by the photovoltaic system. And an energy storage battery is arranged between the AC/DC conversion module and the DC/DC conversion module to store direct current and solar power generation, wherein the energy storage battery is a echelon battery pack.
The control method provided by the invention mainly solves the problem of orderly charging of the electric automobiles in the residential area. The technical scheme of the invention comprises the following steps of collecting battery system information:
when the SOC of the battery is less than 20%, the battery does not provide a quick charging function for the electric automobile and does not feed back energy to the power grid, the electric automobile is charged through the power grid and the photovoltaic system, the battery is charged when the electric quantity of the power grid is sufficient, and the charging function is provided only through the photovoltaic system when the electric quantity of the power grid is insufficient;
when the SOC of the battery is more than 20% and less than 80%, the battery quickly charges the electric automobile, the maximum output power does not exceed the rated power of the electric automobile, and the battery is charged when the electric quantity of a power grid is sufficient;
when the SOC of the battery is more than 80%, the battery provides a quick charging function and a power grid feedback function of the electric automobile, the maximum output power does not exceed the rated power of the electric automobile, and the battery is charged when the power consumption of the power grid is low.
The method can effectively ensure the orderly charging of the electric automobile and the safety and stability of the battery system.
The energy storage battery added in the charging system adopts a gradient battery, the energy storage battery is configured in a cell, and the energy storage battery is charged when the automobile does not need to be charged; when the automobile needs to be quickly charged, the energy storage battery plays a main role. The adoption of the echelon battery can prolong the service life of the battery, reduce the total life cycle cost of the power battery and realize the maximization of the resource utilization of the waste power battery.
The electric automobile can be slowly charged by directly providing electric energy from a power grid, and can also be quickly charged by using the energy storage battery, the energy storage battery and the electric automobile adopt a Vehicle-to-grid (V2G) mode, so that the electric energy management is realized for the electricity consumption of residents, the functions of energy efficiency optimization and peak and valley elimination are achieved, the power can be supplied for important loads when the power grid fails, the randomness of charging behaviors is stabilized, the load fluctuation is controlled, and the electric energy quality of the power grid is improved.
According to the invention, the state monitoring unit is used for acquiring the real-time voltage, current and power parameters of the incoming line of the resident user, the SOC state of the energy storage battery, and the state information of whether the electric automobile is connected with the charging pile or not, the charging completion condition and the like. And the communication unit is used for transmitting various monitoring state parameters and receiving control instructions to control the units.
The direct current supply network in the rapid charging system can supply power to the LED street lamp of the name unit, so that the LED street lamp does not need a rectification and filtering module, on one hand, the structure of the street lamp is simplified, the cost is saved, the problem that a traditional street lamp rectifier is easy to break is solved, and on the other hand, the energy loss in the rectification process inside the street lamp is also avoided.
The plug-and-play control method for charging of the electric vehicle with the energy storage battery is shown in fig. 2, and specifically comprises the following steps:
(1) and rectifying and filtering the alternating current commercial power to obtain direct current.
(2) And networking the obtained direct current to form a low-voltage direct current power supply network, wherein the low-voltage direct current power supply network can provide a direct current power supply for the connected charging pile device and the energy storage battery.
The solar energy or wind energy and other new energy sources can be converted into appropriate direct current, then electric energy generated by new energy power generation is merged into the low-voltage direct current power supply network, meanwhile, the power supply of the new energy sources such as the solar energy or the wind energy is limited by external energy conditions, the new energy power generation is stored in the energy storage battery, and the low-voltage direct current power supply network can also provide direct current for the LED street lamp of the lighting unit at night.
(3) According to the electric automobile energy storage battery and the single-phase electric wire netting electric quantity condition of family, judge the charging sequence and whether need quick charge:
(3-1) acquiring the SOC of the battery before charging the electric automobile, wherein when the SOC is less than 0.2, the battery does not provide the quick charging function of the electric automobile, and does not feed back energy to the power grid, and whether the power grid electric quantity is sufficient is judged:
when the electric quantity of the power grid is insufficient, the electric automobile is charged only through the photovoltaic system;
when the electric quantity of the power grid is sufficient, the power grid and the photovoltaic system charge the electric automobile and simultaneously charge the energy storage battery.
(3-2) when the state of charge of the energy storage battery is 0.2 and the SOC is less than 0.8, judging whether the electric quantity of the power grid is sufficient:
when the electric quantity of the household power grid is sufficient and the automobile needs to be charged, the power grid, the photovoltaic system and the energy storage battery jointly provide electric energy, and when the automobile does not need to be charged, the power grid and the photovoltaic system charge the energy storage battery;
when the electric quantity of the household power grid is insufficient and the automobile needs to be charged, the energy storage battery and the photovoltaic system charge the electric automobile, and when the automobile does not need to be charged, the energy storage battery feeds back electric energy to the power grid in a photovoltaic mode.
(3-3) when the state of charge of the energy storage battery is SOC >0.8, judging whether the electric quantity of the power grid is sufficient:
when the electric quantity of the household power grid is sufficient, the power grid, the photovoltaic system and the energy storage battery jointly charge the electric automobile;
when the electric quantity of the household power grid is insufficient, the energy storage battery and the photovoltaic system charge the electric automobile and discharge the power grid at the same time.
The utility model discloses a fill electric pile device has two kinds of charge modes: a real-time charging mode and a timed charging mode. The real-time charging mode is that the electric automobile starts to be charged immediately after being connected to the charging pile, the timing charging mode is that the user selects the time for starting to charge, and when the selected time is reached, the charging pile starts to charge the electric automobile again.
The low-voltage direct-current power supply network based on establishment provides direct-current power supply for charging the pile, so that the pile device does not need an additional rectification and filtering module, the cost can be reduced, the failure rate can be reduced while the structure is simplified, and the alternating current-direct current conversion frequency can be reduced by establishing the low-voltage direct-current power supply network, so that the conversion efficiency is improved, and the energy utilization rate is improved.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (1)
1. A control method of an electric vehicle charging plug and play system configured with an energy storage battery is characterized by comprising the following steps:
(1) acquiring direct current;
(2) forming a low-voltage direct-current power supply network;
(3) determining whether to charge quickly;
in the step (1), alternating current commercial power provided by a household single-phase power grid is rectified and filtered by an AC/DC conversion module and a DC/DC conversion module to obtain direct current;
in the step (2), the networking mode of the low-voltage direct-current power supply network is as follows:
an energy storage battery is connected between the AC/DC conversion module and the DC/DC conversion module;
connecting a direct current load, a rapid charging pile and a photovoltaic system behind each DC/DC converter module;
the energy storage battery comprises a echelon battery pack;
merging the electric energy generated by the photovoltaic system into a low-voltage direct-current power supply network; or the like, or, alternatively,
storing electric energy generated by the photovoltaic system in an energy storage battery;
the low-voltage direct-current power supply network supplies direct current to an LED street lamp and a rapid charging pile of a lighting unit contained in a direct-current load;
in the step (3), when the state of charge SOC of the echelon battery pack is less than 0.2, the state of charge is as follows:
i. when the electric quantity of the household single-phase power grid is sufficient, the household single-phase power grid and the photovoltaic system charge the electric automobile and simultaneously charge the echelon battery pack;
ii. When the electric quantity of the household single-phase power grid is insufficient, the electric automobile is charged only through the photovoltaic system;
in the step (3), when the SOC of the echelon battery pack is more than 0.2 and less than 0.8, the charging state is as follows:
i. when the household single-phase power grid is sufficient in electric quantity: when the automobile is charged, the household single-phase power grid and the energy storage battery jointly provide electric energy; if the automobile does not need to be charged, the household single-phase power grid and the photovoltaic system charge the echelon battery pack;
ii. When the household single-phase power grid is insufficient in electric quantity: when the automobile is charged, the automobile is charged through the energy storage battery; if the automobile does not need to be charged, the energy storage battery feeds back electric energy to the household single-phase power grid;
in the step (3), when the SOC of the echelon battery pack is greater than 0.8, the charging state is as follows:
i. when the electric quantity of the household single-phase power grid is sufficient, the household single-phase power grid and the energy storage battery jointly charge the electric automobile;
ii. When the electric quantity of the household single-phase power grid is insufficient, the energy storage battery charges the electric automobile and discharges the household single-phase power grid at the same time.
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| CN108032740A (en) * | 2017-10-24 | 2018-05-15 | 合肥成科电子科技有限公司 | A kind of energy storage type electric automobile charging pile system |
| CN108321864B (en) * | 2018-01-12 | 2021-05-14 | 许继电源有限公司 | Charging system with multi-terminal complementary input and output energy coordinated distribution and control method |
| CN109624748A (en) * | 2018-09-13 | 2019-04-16 | 哈尔滨理工大学 | A kind of charging device of electric automobile and control method utilizing battery using echelon |
| CN109927586A (en) * | 2018-09-13 | 2019-06-25 | 哈尔滨理工大学 | A kind of mobile energy storage wireless charging device of electric car and control method in the sufficient area of suitable illumination |
| CN110077252A (en) * | 2019-05-09 | 2019-08-02 | 北京金茂绿建科技有限公司 | A kind of energy storage control system of stereo garage |
| CN112193113B (en) * | 2019-06-06 | 2021-11-26 | 厦门市福工动力技术有限公司 | Intelligent power supply method of high-power charging device for electric vehicle |
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