CN112542893A - Large-scale energy storage system - Google Patents
Large-scale energy storage system Download PDFInfo
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- CN112542893A CN112542893A CN202011491759.6A CN202011491759A CN112542893A CN 112542893 A CN112542893 A CN 112542893A CN 202011491759 A CN202011491759 A CN 202011491759A CN 112542893 A CN112542893 A CN 112542893A
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- Prior art keywords
- energy storage
- converter
- storage system
- optical fiber
- transformer
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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
- H02J15/00—Systems for storing electric energy
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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
- H02J3/28—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
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a large-scale energy storage system, comprising: the system comprises a plurality of energy storage units, a plurality of high-speed optical fiber networks and a centralized controller; each energy storage unit comprises a battery cluster, an energy storage converter and a step-up transformer; the battery cluster is sequentially connected with the energy storage converter and the step-up transformer; the optical fiber communication network is connected with the energy storage converter and is used for transmitting control PWM signals and sampling signals of each energy storage unit; the centralized control is connected with a plurality of optical fiber communication networks; the battery cluster of the energy storage units is connected into an alternating current step-up transformer through an energy storage converter, each energy storage unit is connected into a step-up station to feed into a power grid after being converged through a medium-voltage alternating current tie line, and the output end of a power plant connected into the step-up station is connected into the centralized control unit. The large-scale energy storage system realizes synchronous control and is used as an independent power supply for the large-scale energy storage system.
Description
Technical Field
The invention relates to the field of energy storage, in particular to a large-scale lithium ion battery energy storage system.
Background
The existing energy storage system mostly adopts an independent battery cabinet and an energy storage converter to form an independent energy storage system, and then the independent energy storage system is sent to a medium-voltage bus through a transformer to realize grid connection. The existing system adopts each converter to be independently controlled, and due to lack of synchronous control after the system is off-grid, problems of circulation, power disturbance and the like occur among energy storage units, the number of the parallel connection is only 2-4, the parallel connection cannot be used as a high-power independent source, and the parallel connection cannot meet the use of a micro-grid or a grid black start power supply.
Disclosure of Invention
In order to solve the problem that an energy storage system in the prior art cannot meet the use requirement of a microgrid or a black start power supply of the power grid, the invention provides a large-scale energy storage system which is used as an independent power supply.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
in order to achieve the purpose, the invention provides the following technical scheme:
a large scale energy storage system, the energy storage system comprising: the system comprises a plurality of energy storage units, a plurality of high-speed optical fiber networks and a centralized controller;
each energy storage unit comprises a battery cluster, an energy storage converter and a step-up transformer; the battery cluster is sequentially connected with the energy storage converter and the step-up transformer;
the optical fiber communication network is connected with the energy storage converter and is used for transmitting control PWM signals and sampling signals of each energy storage unit;
the centralized control is connected with a plurality of optical fiber communication networks and a plurality of energy storage units;
the battery cluster of the energy storage units is connected into an alternating current step-up transformer through an energy storage converter, each energy storage unit is connected into a step-up station to feed into a power grid after being converged through a medium-voltage alternating current tie line, and the output end of a power plant connected into the step-up station is connected into the centralized control unit.
Optionally, the optical fiber communication network is a point-to-point transmission full-duplex single-mode optical fiber network.
Optionally, the centralized control includes an FPGA, a DSP and an output interface, and the FPGA, the DSP and the output interface are connected in sequence; and the photoelectric conversion interface of each energy storage unit is connected with the FPGA.
Optionally, the centralized control further includes a sensor for collecting the grid voltage and current signals, and the sensor for collecting the grid voltage and current signals is connected to the output interface.
Optionally, the energy storage battery cluster is a single-string battery series-connection cluster.
Optionally, the energy storage converter is an alternating current-direct current bidirectional energy storage converter.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, each energy storage unit is simplified into an execution unit through a high-speed optical fiber network, the control system is independent of each energy storage unit to form a virtual large-scale energy storage system, the centralized controller collects the data of the grid-connected point and sends control signals to each execution unit, synchronous control is realized, and the problem of large-scale parallel connection is solved. The control system is changed from distributed control to centralized control, so that the problems of circulation and power oscillation are avoided. Through the sampling control of the side of the centralized power grid, the multi-converter is virtualized to be a centralized converter, and the centralized converter can be operated as an independent voltage source. The multi-machine distributed arrangement solves the problems of difficult heat dissipation and large-current device capacity limitation caused by a high-power independent energy storage converter.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a simplified schematic diagram of a large-scale energy storage system according to the present invention.
Fig. 2 is a simplified schematic diagram of a control unit according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention is a large scale energy storage system, comprising: the system comprises a plurality of energy storage units, an optical fiber communication network and a centralized controller;
the energy storage unit consists of a battery cluster, an energy storage converter and a step-up transformer; the energy storage battery cluster is a single-string battery series cluster, and battery parallel loss is avoided.
The energy storage converter is an alternating current-direct current bidirectional energy storage converter, and different from the existing energy storage converter, the converter can receive PWM control pulse width signals issued by a superior centralized control system through a high-speed optical fiber communication network to control power devices, and can transmit sampling signals such as internal direct current voltage, current, alternating current voltage, current, main element temperature and the like to the centralized controller.
And the step-up transformer is used for increasing the alternating-current low voltage output by the converter to 6KV plant internal lines or 35KV tie lines.
The optical fiber communication network is a point-to-point transmission full-duplex single-mode optical fiber network so as to ensure high-speed transmission of control PWM signals and sampling signals transmitted to each energy storage unit.
The centralized control comprises a high-speed optical fiber communication interface and a control unit, and also comprises a sensor for collecting grid voltage and current signals, a control system for supplying power and other auxiliary equipment.
Specifically, a direct-current battery cluster included by the energy storage units is connected into an alternating-current boosting transformer through an energy storage converter, each energy storage unit is connected into a boosting station to feed into a power grid after being converged through a medium-voltage alternating-current connecting line, the power plant output end connected into the boosting station is connected into the centralized control unit, the centralized control unit is used as a grid-connected control point of the virtual energy storage system at the point, a current sensor and a voltage sensor are connected, and the final output quantity of the system is collected into the centralized controller.
As shown in fig. 2, the centralized control system is a schematic diagram, the centralized controller includes an FPGA, a DSP and an output interface, and the FPGA, the DSP and the output interface are connected in sequence; and the photoelectric conversion interface of each energy storage unit is connected with the FPGA.
And the centralized control system is connected with the booster station and then is merged into the power transmission network.
According to the large-scale energy storage system, the control system is independent of each energy storage unit to form a virtual large-scale energy storage system, the centralized controller collects the data of the grid-connected point and sends control signals to each execution unit, synchronous control is achieved, and the problem of large-scale parallel connection is solved.
All articles and references disclosed above, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.
A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided would be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the applicant consider that such subject matter is not considered part of the disclosed subject matter.
Claims (6)
1. A large scale energy storage system, comprising: the system comprises a plurality of energy storage units, a plurality of high-speed optical fiber networks and a centralized controller;
each energy storage unit comprises a battery cluster, an energy storage converter and a step-up transformer; the battery cluster is sequentially connected with the energy storage converter and the step-up transformer;
the optical fiber communication network is connected with the energy storage converter and is used for transmitting control PWM signals and sampling signals of each energy storage unit;
the centralized control is connected with a plurality of optical fiber communication networks and a plurality of energy storage units;
the battery cluster of the energy storage units is connected into an alternating current step-up transformer through an energy storage converter, each energy storage unit is connected into a step-up station to feed into a power grid after being converged through a medium-voltage alternating current tie line, and the output end of a power plant connected into the step-up station is connected into the centralized control unit.
2. The large scale energy storage system of claim 1, wherein the fiber optic communication network is a point-to-point transmission full duplex single mode fiber optic network.
3. The large-scale energy storage system according to claim 1, wherein the centralized control comprises an FPGA, a DSP and an output interface, and the FPGA, the DSP and the output interface are connected in sequence; and the photoelectric conversion interface of each energy storage unit is connected with the FPGA.
4. The large scale energy storage system of claim 3, wherein the centralized control further comprises a grid voltage and current signal acquisition sensor, and the grid voltage and current signal acquisition sensor is connected to the output interface.
5. The large scale energy storage system of claim 1, wherein the energy storage battery clusters are single string battery series clusters.
6. The large scale energy storage system of claim 1, wherein the energy storage converter is a bidirectional ac/dc energy storage converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011491759.6A CN112542893A (en) | 2020-12-16 | 2020-12-16 | Large-scale energy storage system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011491759.6A CN112542893A (en) | 2020-12-16 | 2020-12-16 | Large-scale energy storage system |
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| CN112542893A true CN112542893A (en) | 2021-03-23 |
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| CN202011491759.6A Pending CN112542893A (en) | 2020-12-16 | 2020-12-16 | Large-scale energy storage system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114069789A (en) * | 2021-11-20 | 2022-02-18 | 傲普(上海)新能源有限公司 | Battery cluster parallel circulating current transformer control circuit |
| WO2024092557A1 (en) * | 2022-11-02 | 2024-05-10 | 宁德时代未来能源(上海)研究院有限公司 | Grid-connection control method for energy storage apparatus, and unit, system and storage medium |
-
2020
- 2020-12-16 CN CN202011491759.6A patent/CN112542893A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114069789A (en) * | 2021-11-20 | 2022-02-18 | 傲普(上海)新能源有限公司 | Battery cluster parallel circulating current transformer control circuit |
| CN114069789B (en) * | 2021-11-20 | 2023-09-22 | 傲普(上海)新能源有限公司 | Control circuit of battery cluster parallel circulation transformer |
| WO2024092557A1 (en) * | 2022-11-02 | 2024-05-10 | 宁德时代未来能源(上海)研究院有限公司 | Grid-connection control method for energy storage apparatus, and unit, system and storage medium |
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Address after: 710003 Caotang science and technology industrial base, Xi'an high tech Zone, Shaanxi Province Applicant after: Xi'an Singularity Energy Co.,Ltd. Address before: 710003 Caotang science and technology industrial base, Xi'an high tech Zone, Shaanxi Province Applicant before: Xi'an Singularity Energy Technology Co.,Ltd. |
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Address after: 710076 Room 101, 1st Floor, South Cross, No. 78 Jinye Road, High tech Zone, Xi'an City, Shaanxi Province, China Applicant after: Xi'an Singularity Energy Co.,Ltd. Address before: 710003 Caotang science and technology industrial base, Xi'an high tech Zone, Shaanxi Province Applicant before: Xi'an Singularity Energy Co.,Ltd. |