CN209344800U - A kind of string type electrochemical energy storage system - Google Patents
A kind of string type electrochemical energy storage system Download PDFInfo
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- CN209344800U CN209344800U CN201920114145.2U CN201920114145U CN209344800U CN 209344800 U CN209344800 U CN 209344800U CN 201920114145 U CN201920114145 U CN 201920114145U CN 209344800 U CN209344800 U CN 209344800U
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- current transformer
- storage system
- energy storage
- electrochemical energy
- transformer
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Abstract
The utility model discloses a kind of string type electrochemical energy storage system, including the isolating transformer being connected with external electrical network, the isolating transformer is also connected with multiple DC/AC current transformers, each DC/AC current transformer is respectively connected with a battery pack, and each DC/AC current transformer is mounted in same current transformer cabinet.This system accesses battery pack multiple branch circuit in DC/AC current transformer, eliminates the circulation problem of battery pack multiple branch circuit parallel connection generation, meanwhile, improve the energy conversion efficiency of energy-storage system.
Description
Technical field
The utility model belongs to electrochemical energy storage technical field, and in particular to a kind of string type electrochemical energy storage system.
Background technique
Energy storage is the key that ensure clean energy resource extensive development and power grid security, economical operation.It is sent out as future source of energy
The important link of exhibition, the development of energy internet be unable to do without the application of energy storage technology.Future is applied to global energy internet
By mainly electrochemical energy storage technology.Cost is to restrict a key factor of energy storage large-scale application, although with new energy
The price of the development of electric car, power battery substantially glides, and energy-storage system cost is made also to decline to a great extent, but commercialized running is returned
The receipts phase is longer.The problem of reduction energy-storage system cost, reduces environmental pollution, and the retired battery echelon of electric car utilizes is put on
Agenda.
The expansion of city size and the change of power structure cause so that electric load difference is increasing round the clock for power grid
Power grid peak-valley difference some other day benefit increases, and brings difficulty to the safe and efficient operation of generating set, electrochemical energy storage system can incite somebody to action
The storage of low-valley interval electric power, needed for meeting peak potential period some electrical power, plays the role of peak load shifting.
As shown in Figure 1, traditional electrochemical energy storage system is by battery pack, battery management system, current transformer and energy management
System composition.Although battery variety is more, since energy-storage system uses level-one formula structure, electric current only needs to carry out DC/AC transformation, energy
High conversion efficiency, but battery pack multi-channel parallel is also easy to produce circulation problem, and system is guarantee n to the bad adaptability of DC voltage
Batteries in parallel connection group voltage consistency, the battery of corresponding same current transformer do not require nothing more than same specifications and models, and need to battery into
The complicated apolegamy work of row, leads to energy-storage system increased costs.
As shown in Fig. 2, being disclosed in the patent that China Patent No. is 202872689U a kind of two-way in existing patented technology
Energy storage inverter topological structure, it uses two-stage type structure, by increasing DC/DC conversion, keeps DC/AC current transformer DC side electric
Pressure is consistent, reduces to battery voltage coherence request, realizes the direct current input mode of two-way or more.But increase DC/
DC convertor circuit also results in increased costs while converter system efficiency reduces.And exist because DC/AC current transformer failure is led
The risk for causing entire energy-storage system to stop transport.
Utility model content
The purpose of the utility model is to provide a kind of string type electrochemical energy storage systems, to solve existing electrochemical energy storage system
Unite it is at high cost, require batteries in parallel connection group stringent problem.
The utility model uses following technical scheme:
A kind of string type electrochemical energy storage system, including the isolating transformer being connected with external electrical network, the isolation transformation
Device is also connected with multiple DC/AC current transformers, and each current transformer is respectively connected with a battery pack, and each current transformer is respectively mounted
In in same current transformer cabinet.
Further, first switch is provided between each DC/AC current transformer and isolating transformer.
Further, the application range of each current transformer is 20kw-30kw.
Further, second switch is provided between the isolating transformer and external electrical network.
Compared with prior art, the utility model has the beneficial effects that
1, string type electrochemical energy storage system provided by the utility model is by multiple independent small-power DC/AC current transformer collection
At in same current transformer cabinet, occupied area is reduced.
2, each DC/AC current transformer is DC side is mutually indepedent, isolation, to different DC/AC current transformers DC side electricity
Pressure without coherence request, each branch can choose different type, different model, difference SOC battery, battery apolegamy is wanted
Reduction is asked, DC side parallel circuit quantity is reduced, reduces initial investment expense, the circulation for avoiding battery pack from generating by parallel connection mentions
High system effectiveness；When wherein a certain branch failure, whole system operation is not influenced, improves the utilization rate of equipment.
3, multiple DC/AC current transformers are in parallel in exchange side, by the control to small-power DC/AC current transformer, actively realize
The realtime power of each branch controls；Due to using level-one DC/AC conversion designs, energy loss is small, and system effectiveness is high, so that this
System is extremely obvious using upper advantage in power battery echelon.
Detailed description of the invention
Fig. 1 is a wherein electrochemical energy storage system structural schematic diagram in the prior art；
Fig. 2 is wherein another electrochemical energy storage system structural schematic diagram in the prior art；
Fig. 3 is the utility model electrochemical energy storage system structural schematic diagram that wherein an embodiment provides；
Wherein: 1- battery pack；2- current transformer cabinet；3- first switch；4-DC/AC current transformer；5- isolating transformer；6-
Two switches.
Specific embodiment
The utility model is described in detail with reference to the accompanying drawings and detailed description.
As shown in figure 3, the utility model discloses a kind of string type electrochemical energy storage systems, including are connected with external electrical network
Isolating transformer 5, second switch 6 is provided between isolating transformer 5 and external electrical network, the benefit that is arranged in this way on the one hand can
With safer, on the other hand can also prevent from interfering.
The isolating transformer 5 is also connected with multiple DC/AC current transformers 4, and each DC/AC current transformer 4 is respectively connected with an electricity
Pond group 1, multiple change DC/AC stream devices 4 are mounted in same current transformer cabinet 2, can be convenient management, space is saved, for rear
The maintenance maintenance of phase also facilitates.And current transformer is set as multiple, DC/AC current transformer 4 each in this way can according to it is corresponding not
It is different with the configuration of battery pack 1, different parameters are set, different battery packs is adapted to, the application range of preferred each current transformer 4
For 20kw-30kw.
Each branch (each DC/AC current transformer 4 and the as branch of battery pack 1) can choose different type, difference
The battery of model, difference SOC (SOC, full name are State of Charge, and state-of-charge is also remaining capacity) selects battery
The requirement matched reduces, and reduces DC side parallel circuit quantity, reduces initial investment expense, the ring for avoiding battery pack from generating by parallel connection
Stream improves system effectiveness.
It is provided with first switch 3 between each DC/AC current transformer 4 and isolating transformer 5, setting first switch 3 can be with
When a certain branch breaks down in system, corresponding switch is cut off, whole system operation is not influenced, improves the utilization of equipment
Rate.
As shown in figure 3, the working process of the utility model is as follows:
When system stored energy, it is successively closed first switch 1-1,1-2 ... 1-n, second switch 6, the exchange from power grid etc.
Electric energy is converted to direct current energy by n independent small-power DC/AC current transformers 4, is stored in battery pack 1-n, when battery fills
When electricity is completed, second switch 2 is cut off, system stops energy storage.
When system exoergic, it is successively closed first switch 1-1,1-2 ... 1-n, second switch 6 is stored in battery pack 1
Electric energy is converted to alternating current by n low power DC/AC current transformers 4, supplies user by isolating transformer 5 and use, work as electricity
Group 1 memory storage in pond can reduce preset value or when user not need electric energy, cut off second switch 6, system stops electric discharge.
When energy storage or exoergic, when certain breaks down all the way, the first switch 3 on the road is cut off, in order to avoid influence other branches
Work.
The utility model integrates multiple low power DC/AC current transformers 4 by a current transformer cabinet 2, can be in separate unit
In energy accumulation current converter cabinet 2, it is directly accessed the battery pack 1 of different voltages grade, and without the circulation generated between DC side parallel
On the one hand problem reduces the apolegamy link of battery complexity, reduce the cost that battery uses, and on the other hand, improves system effectiveness
While, it reduces because equipment fault leads to the probability of system shutdown.
Power grid alternating current is converted to direct current and supplies electricity to electricity by electrochemical energy storage system in the low power consumption period by current transformer 5
Pond charging, when peak of power consumption period or grid power blackout, stores electric energy in the battery, passes through current transformer 4, battery pack by direct current
1 multiple branch circuit accesses in DC/AC current transformer 4, eliminates the circulation problem of 1 multiple branch circuit parallel connection of battery pack generation, meanwhile, improve storage
The energy conversion efficiency of energy system.
The utility model is applied to an actual modular design, 1 set of 300kW string type energy-storage system, with 10 30kW
DC/AC current transformer parallel arrangement Yu Yitai current transformer cabinet 2 in, every 30kWDC/AC current transformer DC side it is mutually indepedent,
Isolation, it is in parallel in exchange side.
Claims (4)
1. a kind of string type electrochemical energy storage system, it is characterised in that: including the isolating transformer (5) being connected with external electrical network,
The isolating transformer (5) is also connected with multiple DC/AC current transformers (4), and each DC/AC current transformer (4) is respectively connected with one
Battery pack (1), each DC/AC current transformer (4) are mounted in same current transformer cabinet (2).
2. a kind of string type electrochemical energy storage system as described in claim 1, it is characterised in that: each DC/AC
First switch (3) are provided between current transformer (4) and isolating transformer (5).
3. a kind of string type electrochemical energy storage system as described in claim 1, it is characterised in that: each current transformer (4)
Application range be 20kw-30kw.
4. a kind of string type electrochemical energy storage system as claimed in claim 1 or 2, it is characterised in that: the isolating transformer
(5) second switch (6) are provided between external electrical network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920114145.2U CN209344800U (en) | 2019-01-23 | 2019-01-23 | A kind of string type electrochemical energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920114145.2U CN209344800U (en) | 2019-01-23 | 2019-01-23 | A kind of string type electrochemical energy storage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209344800U true CN209344800U (en) | 2019-09-03 |
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| CN201920114145.2U Active CN209344800U (en) | 2019-01-23 | 2019-01-23 | A kind of string type electrochemical energy storage system |
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| Country | Link |
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| CN (1) | CN209344800U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111262141A (en) * | 2020-01-20 | 2020-06-09 | 山东山大电力技术股份有限公司 | Charging station energy storage cabinet and energy storage system |
| CN111555322A (en) * | 2020-04-21 | 2020-08-18 | 深圳市禾望电气股份有限公司 | Energy storage system |
-
2019
- 2019-01-23 CN CN201920114145.2U patent/CN209344800U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111262141A (en) * | 2020-01-20 | 2020-06-09 | 山东山大电力技术股份有限公司 | Charging station energy storage cabinet and energy storage system |
| CN111555322A (en) * | 2020-04-21 | 2020-08-18 | 深圳市禾望电气股份有限公司 | Energy storage system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200422 Address after: No.6, west of 4th floor, building 10, West Yungu, Fengxi new city, Xixian New District, Xi'an City, Shaanxi Province Patentee after: Xi'an Yineng Intelligent Technology Co., Ltd Address before: 710600 Xinfeng Industrial Park, Lintong District, Xi'an City, Shaanxi Province Patentee before: XI'AN HUAXIN NEW ENERGY Co.,Ltd. |
|
| TR01 | Transfer of patent right |