CN102468678A - Power grid optimized direct current charging system - Google Patents
Power grid optimized direct current charging system Download PDFInfo
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- CN102468678A CN102468678A CN2010105526477A CN201010552647A CN102468678A CN 102468678 A CN102468678 A CN 102468678A CN 2010105526477 A CN2010105526477 A CN 2010105526477A CN 201010552647 A CN201010552647 A CN 201010552647A CN 102468678 A CN102468678 A CN 102468678A
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- battery
- battery pack
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- matrix
- charging system
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
- H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a power grid optimized direct current charging system. The system comprises a battery pack matrix, a bidirectional power electronic device, a battery control and management system and an electric vehicle direct current charging device and port, wherein the battery pack matrix is used for storing electric energy and providing direct current charging; the bidirectional power electronic device is used for controlling charging and discharging between the battery pack matrix and a power grid by matching with the battery control and management system; the battery control and management system is used for ensuring the normal work of the battery matrix by temperature control, battery cell balance and charging state management; and the electric vehicle direct current charging device and port is used for charging a plurality of electric vehicles at the same time by using the electric energy stored in the battery matrix through direct current charging ports. By using the power grid optimized direct current charging system of the embodiment provided by the invention, direct current can be provided for the electric vehicle for charging rapidly by utilizing the energy stored in the battery, simultaneously service such as charge balance, frequency regulation and the like are also provided for the power grid.
Description
Technical field
The present invention relates to the electric power network technique field, particularly a kind of network optimization DC charging system.
Background technology
1. battery technology
The energy density of lithium ion battery electrode material and cycle life are significantly improved than in the past in recent years.Expect 2015, electric core energy density can surpass 200wh/kg.Room temperature cycle life can be greater than 5000 times when 70% depth of discharge, can be greater than 12000 times when 60% depth of discharge.We are expected under the situation of maximum consumption (charging every day 5 times), and the design capacity of electric core (100-80% of initial capacity) can keep 7 years.Under the situation of minimum amount, (charge every day 1 time), the design capacity of electric core can keep 33 years.If under the situation that is lower than design capacity (80-40% of initial capacity), continue to make the electricity consumption core, can under the situation of maximum consumption, increase the operating period of other 4-7.
Although the energy density of battery electrode material and cycle life can satisfy the requirement that electrical network is used in theory, it still can't large-scale popularization in practical application.Its main cause is that present technical merit still can't solve the integrity problem that a large amount of electric cores connects, and the problem of state-of-charge estimation precision and electric core dynamic equilibrium.
2. the application of battery technology in intelligent grid
At present gradually ripe in the exploitation of America and Europe's intelligent grid technology, wherein important part is to utilize the novel battery group to come to provide for electrical network services such as load balancing and frequency adjustment to the function of depositing fast of electric energy.This function can make intelligent grid come the information interaction between control centre and the grid equipment through the intellectual technology system of adjustment generating, power consumption equipment power optimization load balancing, thereby reaches reliable, the safety, economy of operation of power networks, efficient, environmental friendliness and target safe in utilization.
Because speeding up the construction of digital transformer substation in recent years, and Digital Control and use many new technologies such as data communication of IEC61850 standard, make the putting in order and become possibility of large-sized battery pack and electrical network.Verify the feasibility that the service of load allotment and frequency adjustment is provided with battery supply in the existing several demonstration projects of US and European, and use battery to store the possibility of regenerative resource.Although should technology because cost is still under test with the battery management system technology limitation, and function is not strong, battery life is lacked.
3. DC charging is technological
Recently in the world Electric Vehicle Development is also got into the practical stage.Along with the application gradually of electric motor car, also frequent day by day to the demand of charging station.Present AC and DC charging station both domestic and external all adopts directly and obtains electric energy from the mode of electrical network power transformation.But,, estimate that the required mass energy of electric vehicle rapid charging station will cause significant stress to existing electric network composition, and may reduce the whole efficiency of electrical network in view of the designed capacity of current network load.Although so at present required hardware and the software engineering in DC charging station is ripe, the integration of DC charging station and intelligent grid is still the problem that needs solution.The another one challenge is that the standard of present dc charger and electric motor car charging inlet and instruction communication is not confirmed yet.Expect 2012, the formulation of this standard just can be accomplished in the world.
Up to the present, do not find that also any use large-sized battery power supply provides the application of direct current quick charge, its main cause is because the immature cost that causes of battery management system is too high.
Summary of the invention
The embodiment of the invention provides a kind of network optimization DC charging system and method; Utilize the novel battery group that electric energy deposited function fast; Intelligent grid optimisation technique and electric automobile DC charging technology are carried out the function integration; Can be implemented in to utilize and be stored in the battery storage energy when direct current quick charge being provided, services such as load balancing and frequency adjustment can also be provided for electrical network for electric automobile.
For achieving the above object, the embodiment of the invention provides a kind of network optimization DC charging system on the one hand, comprising:
The battery pack matrix is used for storage of electrical energy, and DC charging is provided;
The bi-directional electric power electronic equipment is used for matching battery control and management system and controls discharging and recharging between said battery pack matrix and the electrical network;
Battery control and management system are used for managing through temperature control, electric core balance and charged state and guarantee said battery pack matrix operate as normal;
Electric vehicle DC charging device and port are used for the electric energy that is stored in said battery matrix is a plurality of electric motor car chargings at one time through the DC charging port.
Said battery pack matrix links to each other with electrical network through said bi-directional electric power electronic equipment.
Said battery control and management system are managed data and the instruction communication between charging station and electrical network, and control the safety system of charging station.
The distribution of said battery pack matrix with a plurality of electric cores by also-string-also-string mode arranges and to form.
Each organizes the parallel module that connects into of said electric core, and each said module all has the transducer of measuring temperature, voltage and current, and said module is used to estimate state-of-charge.
A plurality of said modules series connection are formed a battery case, and again with said battery case and be unified into a battery pack frame, said battery pack matrix is in series by said a plurality of battery pack framves.
The cooling of said module is air-cooled or liquid cools; Said liquid is cold to be under battery case, to build the cool cycles fin, and said fin is integrated a part that becomes said battery pack frame.
The said battery pack frame of each series connection is to be isolated by a contactor under battery control and management system control.
Each said battery pack frame is installed the safeguard protection that an intelligent short circuit detector provides said battery pack frame.
Pile up parallelly connected a plurality of battery case on each said battery pack frame.
Said battery control and management system comprise:
The state-of-charge evaluation unit is used for voltage, the current temperature of each module are estimated state-of-charge as the input data;
The setup unit of power and state-of-charge value is used for according to the battery supply service conditions, manages the velocity of discharge through the restriction discharge power;
Battery matrix equilibrium strategy unit is used for battery is carried out dynamic electric core balance when each battery is full of electricity;
The module failure automatic detection unit; Be used for detecting automatically the fault of wiring or said battery pack matrix, when breaking down, send warning signal and remind problem area; Under the situation of catastrophe failure, then cut off contactor automatically so that isolate the faulty component of battery pack matrix.
Compared with prior art, the embodiment of the invention has the following advantages:
1. charging electric vehicle---as the DC-to-DC charging station is that electric automobile provides electric energy.
2. load balancing---according to the network load management strategy, in low peak period to the charging of battery matrix, then in the peak period to the electrical network feedback to realize effective critical load protection and load balancing.
3. network system is regulated---and the bi-directional electric power electronic equipment in the network optimization charging system both capable of using is used as improving the power coefficient means for correcting of electrical network efficient; Also can come fast charging and discharging, improve the electrical network power quality index thus and comprise variation, frequency shift (FS), three-phase imbalance, harmonic wave, flickering, voltage collapse and jump etc. according to the instruction of control of electrical network or battery and management system (C) control algolithm.
4. the integration of regenerative resource---in order to the electric energy of generations such as storage renewable energy power generation equipment such as windmill, solar panels.
5. reducing the power plant idle capacity---the electric power energy stored in the battery is the deployed back electrical network rapidly, thereby reduces the demand of power plant idle capacity, improves the ability that power plant reacts to the cataclysm of loading.
6. load and mould---according to the power grid control device actuating signal is provided, the battery charge load can be carried out dynamic adjustments according to the needs of network optimization.
7. uninterrupted stand-by power supply---when running into the partial electric grid outage, the electric power energy of storing in the battery can be hospital, and key units such as data center provide the short-term power supply.
Use the battery pack matrix to be used as a multiduty energy storage source, can not only through provide the quick charge service (＞200kW) promote the extensive use of motor vehicle, it also will make the power plant auxiliary generating plant be able to more effectively run.Because basic generation unit operates in one and continues to optimize state, therefore reduced the use of auxiliary generating plant and then significantly reduced carbon dioxide, the discharging of nitrogen oxide and sulfur dioxide.The battery matrix is much faster than the response time of current electrical network to the response time that network load changes.Its response time is to be unit with the millisecond, rather than traditional power plant is minute being the response time of unit.
Pass through the embodiment of the invention; Intelligent grid optimisation technique and electric automobile DC charging technology are carried out the function integration; Thereby the new ideas of a network optimization charging system have been started; It is stored in when energy in the battery provides the direct current quick charge for electric automobile in utilization, and services such as load balancing and frequency adjustment also are provided for electrical network
Description of drawings
Fig. 1 is the relational structure sketch map of embodiment of the invention network optimization DC charging system.
Embodiment
The embodiment of the invention provides a kind of network optimization DC charging system; Pass through the embodiment of the invention; Intelligent grid optimisation technique and electric automobile DC charging technology are carried out the function integration; Thereby started the new ideas of a network optimization charging system, it is stored in when energy in the battery provides the direct current quick charge for electric automobile in utilization, and services such as load balancing and frequency adjustment also are provided for electrical network.
As shown in Figure 1, the structure chart for embodiment of the invention network optimization DC charging system comprises:
The battery pack matrix A is used for storage of electrical energy, and DC charging is provided;
Bi-directional electric power electronic equipment B is used for matching battery control and management system C and controls discharging and recharging between battery pack matrix A and the electrical network;
Battery control and management system C, be used for through temperature control, electric core balance and charged state manage and guarantee battery pack matrix A operate as normal;
Electric vehicle DC charging device and port D are used for the electric energy that is stored in the battery pack matrix A is a plurality of electric motor car chargings at one time through the DC charging port.
Battery control and management system C also comprise: control algolithm unit and sensing unit.
The battery pack matrix A links to each other with electrical network through bi-directional electric power electronic equipment B at any time.According to the instruction of electrical network or battery control and management system C control algolithm, but control of bi-directional electric power electronic equipment B matching battery and management system C control discharging and recharging of battery pack matrix A, so that optimize service for electrical network provides.The electric energy that is stored in the battery pack matrix A can also be a plurality of electric motor car chargings at one time through DC charging equipment and port D.
Wherein, battery pack matrix A:
The distribution of battery pack matrix A with many electric cores by also-string-also-string mode arranges and to form, such design can provide the highest reliability, stability and maintainable.
Each organizes the parallel module that connects into of electric core.Each module will have the transducer of measuring temperature, voltage and current, be used to estimate state-of-charge.Then the series connection of several modules is formed a battery case, again with some battery cases and be unified into a battery pack frame.The whole battery group matrix A then is in series by a plurality of battery pack framves.
The cooling of module can be air-cooled or liquid cools.Liquid cools need be built the cool cycles fin under battery case, these fin become integration the part of battery pack frame.
The design of battery pack frame will make each series connected battery group frame isolated by a contactor under battery control is controlled with management system C, so that meet emergencies or maintain service.Each battery pack frame has also been installed the safeguard protection that an intelligent short circuit detector provides the battery pack frame.Whole matrix can be maintained service in the battery case one-level---and this means under any circumstance and can safeguard by online extraction battery case, and can not influence the general function of battery pack frame or matrix system.It also has the ability that increases the global matrix capacity neatly, as long as on each battery pack frame, pile up the more battery cases of parallel connection, both can dilatation under the situation that keeps same direct voltage scope, and need not change power electronic equipment.
Bi-directional electric power electronic equipment B:
Used bi-directional electric power electronic equipment can be selected existing international advanced technology for use, is the basis with the standard model, makes part to the capacity of this battery pack matrix and revises, and both can network.
The data of bi-directional electric power electronic equipment and intelligent grid and instruction communication also will be in accordance with the standards of IEC61850 communication protocol; Accept operator on duty's and regional intelligent aspect dispatcher in the area information processing center station of intelligent grid operational order; And can accomplish the programming operations of intervening by instruction without personnel, to reach the purpose of optimizing electrical network.
Battery control and management system C comprise: the setup unit of state-of-charge evaluation unit, power and state-of-charge value, battery matrix equilibrium strategy unit and module failure automatic detection unit; Wherein,
State-of-charge evaluation unit: the state-of-charge (error＜3%) that can predict the battery matrix at any traffic coverage exactly.The state-of-charge algorithm for estimating is considered voltage, electric current and the temperature of each module, and estimates state-of-charge with them as the input data.The control of battery charge state is one of the most critical factor in decision battery matrix life-span, and it also is used to have in the counting cell matrix energy of how many storages can be used to the charging service.
The setup unit of power and state-of-charge value: battery matrix institute electricity consumption core designs by bearing the 3c speed of discharging and recharging.Under the situation of 3c discharge rate, be full of fully the electricity the battery matrix can for about 6000 families provide half an hour electric power.The Control Software of battery management system can be managed the velocity of discharge through the method for restriction discharge power according to the battery supply service conditions.It can also come maximized extending the life of a cell through the degree of depth of control battery discharge (DoD).Under normal condition, depth of discharge will maintain below 80% of total capacity.
Battery matrix equilibrium strategy unit: single electric core/module will adopt dynamic equilibrium to come life-saving and improve utilization ratio.For energy savings and the living heat of minimizing, battery will carry out dynamic electric core balance when each battery is full of electricity.
The module failure automatic detection unit: we will have a specific process to come to detect automatically any wiring or battery matrix fault, in case pinpoint the problems, battery control and management system C can send warning signal and remind keeper's problem area.It also can cut off contactor automatically so that isolate the faulty component of battery pack matrix A under the situation of catastrophe failure.
Battery control will be controlled through temperature with management system C, electric core balance and charged state are managed and guarantee that the battery pack matrix A works under optimum condition.It also will manage data and instruction communication between charging station and electrical network, and control the safety system of charging station.
Electric vehicle DC charging device and port D:
Electric vehicle DC charging device and port D adopt SAE or IEC charging standard, possess the ability of 1,2,3 grades of DC chargings.Ceiling voltage can reach 600V, maximum current 400A, and charging interval and charging rate will be controlled by the automobile batteries management system.Communication between the charging preparatory stage between two equipment will use the charge communication protocol of standard code of SAE or IEC to confirm battery capacity and safe condition.
Through the description of above execution mode, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding; The part that technical scheme of the present invention contributes to prior art in essence in other words can be come out with the embodied of software product; This computer software product is stored in the storage medium; Comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
More than disclosedly be merely several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (11)
1. a network optimization DC charging system is characterized in that, comprising:
The battery pack matrix is used for storage of electrical energy, and DC charging is provided;
The bi-directional electric power electronic equipment is used for matching battery control and management system and controls discharging and recharging between said battery pack matrix and the electrical network;
Battery control and management system are used for managing through temperature control, electric core balance and charged state and guarantee said battery pack matrix operate as normal;
Electric vehicle DC charging device and port are used for the electric energy that is stored in said battery matrix is a plurality of electric motor car chargings at one time through the DC charging port.
2. network optimization DC charging system according to claim 1 is characterized in that, said battery pack matrix links to each other with electrical network through said bi-directional electric power electronic equipment.
3. like the said network optimization DC charging system of claim 2, it is characterized in that said battery control and management system are managed data and the instruction communication between charging station and electrical network, and control the safety system of charging station.
4. like the said network optimization DC charging system of claim 2, it is characterized in that, the distribution of said battery pack matrix with a plurality of electric cores by also-string-also-string mode arranges and to form.
5. like the said network optimization DC charging system of claim 4, it is characterized in that each organizes the parallel module that connects into of said electric core, each said module all has the transducer of measuring temperature, voltage and current, and said module is used to estimate state-of-charge.
6. like the said network optimization DC charging system of claim 5, it is characterized in that, a plurality of said modules series connection are formed a battery case, again with said battery case and be unified into a battery pack frame, said battery pack matrix is in series by said a plurality of battery pack framves.
7. like the said network optimization DC charging system of claim 6, it is characterized in that the cooling of said module is air-cooled or liquid cools; Said liquid is cold to be under battery case, to build the cool cycles fin, and said fin is integrated a part that becomes said battery pack frame.
8. like the said network optimization DC charging system of claim 7, it is characterized in that the said battery pack frame of each series connection is to be isolated by a contactor under battery control and management system control.
9. like the said network optimization DC charging system of claim 8, it is characterized in that each said battery pack frame is installed the safeguard protection that an intelligent short circuit detector provides said battery pack frame.
10. like the said network optimization DC charging system of claim 9, it is characterized in that, pile up parallelly connected a plurality of battery case on each said battery pack frame.
11. the network optimization DC charging system is characterized in that according to claim 1, said battery control and management system comprise:
The state-of-charge evaluation unit is used for voltage, the current temperature of each module are estimated state-of-charge as the input data;
The setup unit of power and state-of-charge value is used for according to the battery supply service conditions, manages the velocity of discharge through the restriction discharge power;
Battery matrix equilibrium strategy unit is used for battery is carried out dynamic electric core balance when each battery is full of electricity;
The module failure automatic detection unit; Be used for detecting automatically the fault of wiring or said battery pack matrix, when breaking down, send warning signal and remind problem area; Under the situation of catastrophe failure, then cut off contactor automatically so that isolate the faulty component of battery pack matrix.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105526477A CN102468678A (en) | 2010-11-17 | 2010-11-17 | Power grid optimized direct current charging system |
| PCT/CN2011/076171 WO2012065441A1 (en) | 2010-11-17 | 2011-06-23 | Dc charging system for optimising grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105526477A CN102468678A (en) | 2010-11-17 | 2010-11-17 | Power grid optimized direct current charging system |
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| CN102468678A true CN102468678A (en) | 2012-05-23 |
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| CN2010105526477A Pending CN102468678A (en) | 2010-11-17 | 2010-11-17 | Power grid optimized direct current charging system |
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| CN (1) | CN102468678A (en) |
| WO (1) | WO2012065441A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106033904A (en) * | 2015-03-20 | 2016-10-19 | 深圳奥特迅电力设备股份有限公司 | Matrix-type flexible charging pile and charging method capable of dynamically allocating power |
| CN106059024A (en) * | 2016-07-22 | 2016-10-26 | 中国电力科学研究院 | Large-power rapid charging converter for family electric car |
| CN106160017A (en) * | 2016-06-30 | 2016-11-23 | 温州大学 | Based on current-sharing deviation expected matrix row and minimum parallel operation system optimized control method |
| CN111404168A (en) * | 2019-12-09 | 2020-07-10 | 重庆邮电大学 | Flexible air conditioner load-based dispatching system and method for stabilizing overload of transformer substation |
| CN112688347A (en) * | 2021-01-12 | 2021-04-20 | 国网上海市电力公司 | System and method for smoothing load fluctuation of power grid |
| CN116387658A (en) * | 2023-06-01 | 2023-07-04 | 深圳和润达科技有限公司 | System and method for realizing energy balance scheduling strategy |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8901888B1 (en) | 2013-07-16 | 2014-12-02 | Christopher V. Beckman | Batteries for optimizing output and charge balance with adjustable, exportable and addressable characteristics |
| CN104617592B (en) * | 2015-02-05 | 2019-04-09 | 国家电网公司 | The control method and device of energy-storage system |
| CN109274138B (en) * | 2017-07-13 | 2024-04-09 | 周锡卫 | Control method of mobile energy storage charging system of multifunctional electric automobile based on combination of multiple energy storage modules |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106033904A (en) * | 2015-03-20 | 2016-10-19 | 深圳奥特迅电力设备股份有限公司 | Matrix-type flexible charging pile and charging method capable of dynamically allocating power |
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| CN106160017A (en) * | 2016-06-30 | 2016-11-23 | 温州大学 | Based on current-sharing deviation expected matrix row and minimum parallel operation system optimized control method |
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| CN111404168A (en) * | 2019-12-09 | 2020-07-10 | 重庆邮电大学 | Flexible air conditioner load-based dispatching system and method for stabilizing overload of transformer substation |
| CN111404168B (en) * | 2019-12-09 | 2023-06-16 | 重庆邮电大学 | Flexible air conditioner load-based dispatching system and method for stabilizing overload of transformer substation |
| CN112688347A (en) * | 2021-01-12 | 2021-04-20 | 国网上海市电力公司 | System and method for smoothing load fluctuation of power grid |
| CN112688347B (en) * | 2021-01-12 | 2024-07-02 | 国网上海市电力公司 | Grid load fluctuation smoothing system and method |
| CN116387658A (en) * | 2023-06-01 | 2023-07-04 | 深圳和润达科技有限公司 | System and method for realizing energy balance scheduling strategy |
| CN116387658B (en) * | 2023-06-01 | 2023-08-08 | 深圳和润达科技有限公司 | System and method for realizing energy balance scheduling strategy |
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| WO2012065441A1 (en) | 2012-05-24 |
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Application publication date: 20120523 |