CN112721666A - Energy storage type group control direct current charging system and charging control method - Google Patents
Energy storage type group control direct current charging system and charging control method Download PDFInfo
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- 238000004891 communication Methods 0.000 claims description 11
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
- B60L53/31—Charging columns specially adapted for electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L55/00—Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model provides an energy storage formula group control direct current charging system and charge control method, includes: the charging system comprises an AC/DC power unit, a bidirectional DC/DC power unit, a battery energy storage system, a power unit switching module and a charging terminal; the bidirectional DC/DC power unit is connected with the battery energy storage system; the power unit switching module comprises a selector switch group, the selector switch group is connected with the AC/DC power unit or the bidirectional DC/DC power unit in a one-to-one correspondence mode, each selector switch group comprises a terminal selector switch and at least one energy storage selector switch, the terminal selector switches are connected with the charging terminals in a one-to-one correspondence mode, the other ends of the terminal selector switches are connected with the AC/DC power unit or the bidirectional DC/DC power unit, and the energy storage selector switches are used for communicating the AC/DC power unit and the bidirectional DC/DC power unit. The power unit switching module is designed, so that the number of used power modules is small, the cost is low, and the bidirectional charging function of the charging terminal V2G can be realized.
Description
Technical Field
The disclosure relates to the technical field of charging of electric vehicles, in particular to an energy storage type group control direct current charging system and a charging control method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Along with the progress and maturity of the technology, an energy storage charging station is created by combining an energy storage and an electric vehicle charging pile to form a multi-element complementary energy power generation micro-grid system, and the main advantages are as follows: the peak-valley electricity price is utilized to the maximum extent by combining the energy storage peak-valley profit, so that the economic benefit is maximized; the charging station has the advantages of slowly charging and quickly discharging, making up for the shortage of power capacity, lightening the load impact of a power distribution network, reducing the cost of a power distribution line of the charging station and generating good social and economic benefits.
At present, an energy storage type charging station is common, but the energy storage type charging station occupies a large area, is high in manufacturing cost and is not easy to popularize. The energy storage type charging pile is also available, but the electric topological structure is complex, the AC/DC rectifying module and the DC/DC inverting module are used more, the application scene is single, and a multi-gun charging system with low cost cannot be formed. The energy storage type charging pile generally adopts a common direct current bus scheme, a system framework is shown in fig. 1, and an AC/DC power module group completes AC/DC rectification inversion from an AC inlet side to a common direct current bus side; the bidirectional DC/DC power module group completes bidirectional DC/DC conversion between the battery energy storage system side and the common direct current bus side; the unidirectional DC/DC power module group completes DC/DC inversion from the common DC bus side to the power unit switching module group side, and then outputs power to the charging terminal through the power unit switching module switching group. The biggest problem in using the scheme is that the used power modules are large in type and number, and the method comprises the following steps: an AC/DC power module, a unidirectional DC/DC power module, and a bidirectional DC/DC power module.
Disclosure of Invention
In order to solve the above problems, the present disclosure provides an energy storage type group control dc charging system and a charging control method, which use a small number of power modules, have low cost, and can implement a bidirectional charging function of the charging terminal V2G.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
one or more embodiments provide an energy storage type group control direct current charging system, including: the charging system comprises an AC/DC power unit, a bidirectional DC/DC power unit, a battery energy storage system, a power unit switching module and a charging terminal; the bidirectional DC/DC power unit is connected with the battery energy storage system;
the power unit switching module comprises a selector switch group, the selector switch group is connected with the AC/DC power unit or the bidirectional DC/DC power unit in a one-to-one correspondence mode, each selector switch group comprises a terminal selector switch and at least one energy storage selector switch, the terminal selector switches are connected with the charging terminals in a one-to-one correspondence mode, the other ends of the terminal selector switches are connected with the AC/DC power unit or the bidirectional DC/DC power unit, and the energy storage selector switches are used for communicating the AC/DC power unit and the bidirectional DC/DC power unit.
One or more embodiments provide an energy storage type group control direct current charging control method, including an electric vehicle charging control method, an electric vehicle discharging control method, a battery energy storage system charging control method or/and a battery energy storage system discharging control method, the electric vehicle charging control method including the following steps:
acquiring a charging request of a charging terminal;
performing power distribution according to the charging power, and determining an AC/DC power unit or/and a bidirectional DC/DC power unit switching combination;
and closing a terminal change-over switch connected with the AC/DC power unit or/and the bidirectional DC/DC power unit which is put into power supply.
Compared with the prior art, the beneficial effect of this disclosure is:
(1) according to the charging method, the structure of the power unit switching module is designed, the connection between the AC/DC power unit and the charging terminal, the connection between the AC/DC power unit and the bidirectional DC/DC power unit, and the connection between the bidirectional DC/DC power unit and the charging terminal are respectively established, the bidirectional charging function of the charging pile terminal V2G can be realized through the on-off control of the power unit switching module, the charging of the electric automobile by the charger can be realized, and the electric automobile can also be discharged to the charger and stored in the battery energy storage system.
(2) According to the charging terminal, the number of the AC/DC rectifying modules and the number of the bidirectional DC/DC inversion modules can be set according to the electric energy requirement of the charging terminal, theoretically, the charging of the electric automobile by the charger can be realized by setting one AC/DC rectifying module and one bidirectional DC/DC inversion module, the electric automobile can discharge to the charger and store the electric automobile in a battery energy storage system, the number of the power unit modules is greatly reduced, and the setting cost is greatly reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure.
FIG. 1 is a diagram of a conventional common DC energy storage type group-controlled DC charging system;
fig. 2 is a schematic structural diagram of an energy storage type group-controlled dc charging system according to embodiment 1 of the present disclosure;
fig. 3 is a schematic diagram of a connection structure of a power unit switching module according to embodiment 1 of the present disclosure.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments in the present disclosure may be combined with each other. The embodiments will be described in detail below with reference to the accompanying drawings.
Example 1
In one or more embodiments, as shown in fig. 2 to 3, an energy storage type group control dc charging system includes:
the charging system comprises an AC/DC power unit, a bidirectional DC/DC power unit, a battery energy storage system, a power unit switching module and a charging terminal; the power unit switching module is respectively connected with the AC/DC power unit, the bidirectional DC/DC power unit, the battery energy storage system and the charging terminal, and the bidirectional DC/DC power unit is connected with the battery energy storage system;
the power unit switching module comprises a selector switch group, the selector switch group is connected with the AC/DC power unit or the bidirectional DC/DC power unit in a one-to-one correspondence mode, each selector switch group comprises a terminal selector switch and at least one energy storage selector switch, the terminal selector switches are connected with the charging terminals in a one-to-one correspondence mode, the other ends of the terminal selector switches are connected with the AC/DC power unit or the bidirectional DC/DC power unit, and the energy storage selector switches are used for communicating the AC/DC power unit and the bidirectional DC/DC power unit.
In this embodiment, by designing the structure of the power unit switching module, connections between the AC/DC power unit and the charging terminal, between the AC/DC power unit and the bidirectional DC/DC power unit, and between the bidirectional DC/DC power unit and the charging terminal are respectively established, and by controlling the switch of the power unit switching module, a bidirectional charging function of the charging pile terminal V2G can be realized, that is, the charging machine can charge the electric vehicle, and the electric vehicle can also discharge the electric vehicle to the charging machine and store the electric vehicle in the battery energy storage system.
Specifically, the input end of the AC/DC power unit is connected to an alternating current inlet wire, and the output end of the AC/DC power unit is connected to the power unit switching module; one side of the bidirectional DC/DC power unit is connected to the battery energy storage system, and the other side of the bidirectional DC/DC power unit is connected to the power unit switching module.
As shown in fig. 3, the connection structure of this embodiment is described with n number of switching switch groups provided corresponding to n number of sum of the AC/DC power units and the bidirectional DC/DC power units, and m number of charging terminals. The number of the AC/DC power units and the number of the DC/DC power units can be set according to the specific configuration of the charger system.
Specifically, in this embodiment, the switch block has a full matrix structure, and is configured to enable each power unit to output to any one of the charging terminal and the battery energy storage system. It can be set that each power unit can only output to a certain charging terminal or a battery energy storage system at any time.
Optionally, the terminal switch and the energy storage switch of the power unit switching module may adopt a dc relay, and the switching operation is realized through the dc relay.
Specifically, the AC/DC power unit switch group, such as the 1# AC/DC power unit switch group in fig. 3, where K1-Km are terminal switches, corresponding power units may be switched to 1# to m # charging terminals by respectively closing DC relays K1-Km, Km +1 is an energy storage switch, and AC/DC power units may be switched to the DC/DC power unit switch group by closing Km +1 DC relays; the DC/DC power unit switching module can switch the corresponding DC/DC power unit to the 1-m # charging terminal by respectively closing the direct current relays K1-Km, and can also switch the corresponding DC/DC power unit to be connected to the AC/DC power unit switching module by closing the Km +1 direct current relay.
Optionally, the AC/DC power unit may include one or more AC/DC rectifying modules for implementing AC/DC rectifying inversion, and the plurality of AC/DC rectifying modules may be output in parallel and connected to the corresponding switch groups of the power unit switching module.
Optionally, the bidirectional DC/DC power unit may include one or more bidirectional DC/DC inverting modules, and the plurality of bidirectional DC/DC inverting modules may output in parallel and be connected to corresponding switch groups of the power unit switching module.
The quantity of the AC/DC rectifying modules and the quantity of the bidirectional DC/DC inversion modules can be set according to the electric energy requirement of the charging terminal, theoretically, the charging of the electric automobile by the charging machine can be realized by setting one AC/DC rectifying module and one bidirectional DC/DC inversion module, the electric automobile can discharge to the charging machine and store the electric automobile in a battery energy storage system, the setting quantity of the power unit modules is greatly reduced, and the setting cost is greatly reduced.
In a further technical scheme, to implement automatic control, as shown in fig. 2, the system further includes a local energy controller for monitoring a real-time working state of the energy storage type group control dc charging system; the local energy controller is in communication connection with the AC/DC power unit, the bidirectional DC/DC power unit, the charging terminal, the battery energy storage system and the power unit switching module respectively, and controls the switching combination of the AC/DC power unit, the switching module of the bidirectional DC/DC power unit and the power unit switching module by detecting the states of the charging terminal and the battery energy storage system, so that charging and discharging control is realized.
Optionally, the local energy controller is in communication connection with the AC/DC power unit, the bidirectional DC/DC power unit, the charging terminal, the battery energy storage system, and the power unit switching module through a CAN bus.
In this embodiment, information interaction and control with the AC/DC power unit, the bidirectional DC/DC power unit, the power unit switching module group, the charging terminal, and the battery energy storage system are respectively realized through CAN 0-CAN 4 buses.
Specifically, each AC/DC rectification module CAN receive a control/query command of a local energy controller through a CAN0 bus to complete AC/DC rectification inversion or uploading of state information. Each DC/DC inversion module CAN receive a control/query command of a local energy controller through a CAN0 bus to complete DC/DC bidirectional inversion or uploading of state information. And the switch switched by each power unit CAN receive a control/query command of a local energy controller through a CAN1 bus to finish power output of the power unit to different charging terminals.
In some embodiments, a superior monitoring system may be further included, the superior monitoring system being communicatively coupled to the local energy controller; specifically, the local energy controller receives monitoring and management of the superior monitoring system through ethernet communication. Through setting up higher level monitored control system can with the local energy controller who sets up different charging position be connected, realize charging system's unified management and control.
In some embodiments, the battery energy storage system includes an energy storage battery, a heating and cooling system (i.e., a thermal management system) for detecting the state of the energy storage battery, and a Battery Management System (BMS) communicatively coupled to the local energy controller.
The local energy controller is communicated with the BMS through a CAN4 bus, collects, processes and stores state information of the energy storage battery pack in the running process in real time, and outputs the setting of parameters in the inversion process of the DC/DC rectification module group. The state information comprises charge and discharge parameters of the battery, a current SOC value and the like.
Optionally, the charging terminal includes a vehicle connection interface and a human-computer interaction system, which are connected to each other, and the human-computer interaction system is in communication connection with the local energy controller; the vehicle connection interface comprises a charging interface and a communication interface and is used for charging the vehicle and establishing communication connection with the vehicle; and the man-machine interaction system monitors the charging process and finishes the metering and charging of the charged electric quantity.
According to the further technical scheme, the charging terminal can support a V2G charging mode, the charging interface is set as a V2G charging module, the charging of the electric automobile by the charger can be achieved, and the electric automobile can also discharge electricity to the charger and store the electricity to the battery energy storage system.
The local energy controller is communicated with the charging terminal through a CAN2 bus, acquires a power request of the charging terminal in real time, executes a dynamic power distribution algorithm and adjusts the power output of the charging terminal in real time.
Further, can adopt the design of outdoor integrative cabinet, each part setting of above-mentioned energy storage formula group control direct current charging system can also include cooling system and fire extinguishing system in integrative cabinet, and cooling system is used for realizing the heat dissipation in the integrative cabinet, and fire extinguishing system is used for realizing fire control and automatic fire extinguishing.
Example 2
Based on the energy storage type group control dc charging system in embodiment 1, this embodiment provides an energy storage type group control dc charging control method, which can be implemented in a local energy controller, and includes an electric vehicle charging control method, an electric vehicle discharging control method, a battery energy storage system charging control method, and a battery energy storage system discharging control method.
The electric vehicle charging control method comprises the following steps:
SA1, acquiring a charging request of the charging terminal;
SA2, performing power distribution according to the charging power, and determining an AC/DC power unit or/and a bidirectional DC/DC power unit switching combination;
SA3, closing a terminal switch connecting the AC/DC power unit or/and the bidirectional DC/DC power unit which are put into power supply.
Specifically, in this embodiment, when the electric vehicle corresponding to the i # charging terminal is charged, the DC relay Ki in the power unit switching module corresponding to the AC/DC power unit or the bidirectional DC/DC power unit distributed by the system is closed, and the other DC relays are opened. That is, both the AC/DC power unit and the bidirectional DC/DC power unit may participate in charging the electric vehicle, and may be charged simultaneously.
The electric vehicle discharge control method comprises the following steps:
SB1, acquiring a discharging request and a discharging power of the charging terminal;
SB2, acquiring state information of the energy storage battery pack, and calculating chargeable energy of the energy storage battery;
SB3, distributing corresponding bidirectional DC/DC power units and closing corresponding terminal change-over switches;
SB4, according to the chargeable energy or the discharge power of the energy storage battery, sets the discharge time and controls the corresponding switch to be turned off when the discharge time is over.
Specifically, in this embodiment, when the electric vehicle discharges and discharges to the electric vehicle corresponding to the i # charging terminal, the DC relay Ki in the power unit switching module corresponding to the bidirectional DC/DC power unit allocated by the system is closed, and the other DC relays are opened. That is, only the bidirectional DC/DC power unit may participate in discharging the electric vehicle.
The charging control method of the battery energy storage system comprises the following steps:
the SC1, acquiring the state information of the battery energy storage system, judging whether charging is needed according to the state information, and executing the next step if charging is needed;
SC2, AC/DC power unit, bidirectional DC/DC power unit that distribute the execution of charging;
and SC3, closing the energy storage change-over switch corresponding to the distributed power unit until the battery energy storage system is charged, and disconnecting the energy storage change-over switch.
In the embodiment, the battery energy storage system is charged, when the battery energy storage system is charged, the direct current relay Km +1 in the change-over switch group corresponding to the AC/DC power unit distributed by the system is closed, and other direct current relays are opened; if the i # electric automobile participates in discharging at the same time, the direct current relay Ki in the power unit switching module corresponding to the bidirectional DC/DC power unit distributed by the system is closed, and other direct current relays are opened. That is, both the AC/DC power cells and the bi-directional DC/DC power cells may participate in battery energy storage system charging.
And further, judging the power consumption valley peak of the power grid, and selecting a time period with less power consumption to charge the battery energy storage system.
Specifically, the peak-valley period of the power consumption can be obtained according to the historical data of the power grid connected to the current ac inlet line end, and the period with less power consumption can be determined according to the specific period.
The discharge control method of the battery energy storage system comprises the following steps:
SD1, acquiring a charging request of the charging terminal;
SD2, distributing the discharge power to the battery energy storage system according to the peak-to-valley period of the power grid;
and SD3, distributing the bidirectional DC/DC power unit for discharging, and controlling the corresponding terminal change-over switch to be closed until the discharging is finished.
In the step SD2, distributing the discharge power to the battery energy storage system according to the peak-to-valley period of the power grid; the discharging power distributed to the battery energy storage system in the power grid peak is higher than a first set value, and the discharging power distributed to the battery energy storage system in the power grid valley period is lower than a second set value. The first setting value and the second setting value may be set as fixed values or may be set dynamically.
When the battery energy storage system discharges and charges the i # electric automobile, the direct current relay Ki in the power unit switching module corresponding to the bidirectional DC/DC power unit distributed by the system is closed, and other direct current relays are opened. That is, only the bi-directional DC/DC power cells may participate in the battery energy storage system discharge.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. An energy storage type group control direct current charging system is characterized in that: the method comprises the following steps: the charging system comprises an AC/DC power unit, a bidirectional DC/DC power unit, a battery energy storage system, a power unit switching module and a charging terminal; the bidirectional DC/DC power unit is connected with the battery energy storage system;
the power unit switching module comprises a selector switch group, the selector switch group is connected with the AC/DC power unit or the bidirectional DC/DC power unit in a one-to-one correspondence mode, each selector switch group comprises a terminal selector switch and at least one energy storage selector switch, the terminal selector switches are connected with the charging terminals in a one-to-one correspondence mode, the other ends of the terminal selector switches are connected with the AC/DC power unit or the bidirectional DC/DC power unit, and the energy storage selector switches are used for communicating the AC/DC power unit and the bidirectional DC/DC power unit.
2. The energy-storing group-control direct-current charging system as claimed in claim 1, wherein: the change-over switch group adopts a full matrix structure and is used for realizing that each power unit can be output to any charging terminal and battery energy storage system.
3. The energy-storing group-control direct-current charging system as claimed in claim 1, wherein: and the terminal change-over switch and the energy storage change-over switch of the power unit change-over module adopt direct current relays.
4. The energy-storing group-control direct-current charging system as claimed in claim 1, wherein: the AC/DC power unit comprises one or more AC/DC rectifying modules, and the AC/DC rectifying modules can be output in parallel and are connected to the corresponding switch groups of the power unit switching modules;
or the bidirectional DC/DC power unit comprises one or more bidirectional DC/DC inversion modules, and the plurality of bidirectional DC/DC inversion modules are output in parallel and connected to the corresponding switch groups of the power unit switching module.
5. The energy-storing group-control direct-current charging system as claimed in claim 1, wherein: the local energy controller is respectively in communication connection with the AC/DC power unit, the bidirectional DC/DC power unit, the charging terminal, the battery energy storage system and the power unit switching module;
or the system also comprises a superior monitoring system which is in communication connection with the local energy controller.
6. The energy-storing group-control direct-current charging system as claimed in claim 5, wherein: the battery energy storage system comprises an energy storage battery, an instant heating management system and a battery management system BMS, wherein the battery management system BMS is used for detecting the state of the energy storage battery, and the battery management system is in communication connection with a local energy controller.
7. The energy-storing group-control direct-current charging system as claimed in claim 1, wherein: the charging terminal comprises a vehicle connection interface and a man-machine interaction system which are connected with each other, and the man-machine interaction system is in communication connection with the local energy controller; the vehicle connection interface comprises a charging interface and a communication interface, and the man-machine interaction system monitors the charging process and finishes the metering and charging of the charged electric quantity.
8. An energy storage type group control direct current charging control method is characterized by comprising the following steps: the method comprises an electric vehicle charging control method, an electric vehicle discharging control method, a battery energy storage system charging control method or/and a battery energy storage system discharging control method, wherein the electric vehicle charging control method comprises the following steps:
acquiring a charging request of a charging terminal;
performing power distribution according to the charging power, and determining an AC/DC power unit or/and a bidirectional DC/DC power unit switching combination;
and closing a terminal change-over switch connected with the AC/DC power unit or/and the bidirectional DC/DC power unit which is put into power supply.
9. The method as claimed in claim 8, wherein the method comprises:
the electric vehicle discharge control method comprises the following steps:
acquiring a discharging request and discharging power of a charging terminal;
acquiring state information of an energy storage battery pack, and calculating chargeable energy of an energy storage battery;
distributing corresponding bidirectional DC/DC power units and closing corresponding terminal change-over switches;
setting discharge time according to chargeable energy or discharge power of the energy storage battery and controlling a corresponding change-over switch to be switched off when the discharge time is over;
or, the charging control method of the battery energy storage system comprises the following steps:
acquiring state information of a battery energy storage system, judging whether charging is needed or not according to the state information, and executing the next step if charging is needed;
an AC/DC power unit, a bidirectional DC/DC power unit, which performs charge distribution;
closing the energy storage change-over switches corresponding to the distributed power units until the battery energy storage system is charged, and disconnecting the energy storage change-over switches;
the discharge control method of the battery energy storage system comprises the following steps:
acquiring a charging request of a charging terminal;
distributing the discharge power to the battery energy storage system according to the peak-valley period of the power grid;
and distributing the bidirectional DC/DC power units for discharging, and controlling the corresponding terminal change-over switches to be closed until the discharging is finished.
10. The method as claimed in claim 9, wherein the method comprises: distributing the discharge power to the battery energy storage system according to the peak-valley period of the power grid; the discharging power distributed to the battery energy storage system in the power grid peak is higher than a first set value, and the discharging power distributed to the battery energy storage system in the power grid valley period is lower than a second set value.
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