CN115483695A - Group string type battery energy storage system - Google Patents
Group string type battery energy storage system Download PDFInfo
- Publication number
- CN115483695A CN115483695A CN202211250265.8A CN202211250265A CN115483695A CN 115483695 A CN115483695 A CN 115483695A CN 202211250265 A CN202211250265 A CN 202211250265A CN 115483695 A CN115483695 A CN 115483695A
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- Prior art keywords
- converter
- energy storage
- battery
- voltage
- storage 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
- H02J3/28—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
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a string type battery energy storage system which comprises a DC/AC converter and a plurality of energy storage branches, wherein the AC side of the DC/AC converter is connected with a power grid, and a DC bus of the DC/AC converter is connected with the plurality of energy storage branches in parallel. The energy storage branch is composed of a filter inductor, a DC/DC converter, a battery cluster and a power supply. The filter inductor, the output end of the DC/DC converter and the battery cluster are connected in series and then connected in parallel to a direct current bus of the DC/AC converter, and the input end of the DC/DC converter is connected in parallel with a power supply. The DC/AC converter dynamically adjusts the voltage of the direct current bus according to information such as the state of charge of the energy storage system, and adjusts the current on the filter inductor by controlling the output voltage of the DC/DC converter, so as to adjust the output power of the battery cluster. Compared with the prior art, the output voltage of the DC/DC converter is only the difference between the DC bus voltage of the DC/AC converter and the voltage of the battery cluster, and the output voltage is far smaller than the voltage of the battery cluster, so that the power of the DC/DC converter is far smaller than the power emitted by the battery cluster.
Description
Technical Field
The invention relates to a string type battery energy storage system.
Background
The energy storage is a key technology for solving the problem of unstable new energy grid connection, and the battery energy storage has the advantage of high energy density and is a common technology for solving the problems of frequency modulation and peak shaving of a power grid. The common battery energy storage system adopts the scheme that batteries are connected in series to form a battery cluster, and a plurality of battery clusters are connected in parallel at a direct current bus of a DC/AC converter. Because the characteristics of each battery cluster are different, the charging and discharging power of each battery cluster is uneven, and the whole machine needs to be stopped as long as one battery works abnormally, so the reliability is low, and the utilization rate of the battery is not high.
Disclosure of Invention
The technical scheme of the invention is as follows: the group of series battery energy storage systems consists of a DC/AC converter and a plurality of energy storage branches, wherein the AC side of the DC/AC converter is connected with a power grid, and a DC bus of the DC/AC converter is connected with the plurality of energy storage branches in parallel; each energy storage branch is composed of a filter inductor, a DC/DC converter, a power supply and a battery cluster. The filter inductor, the output end of the DC/DC converter and the battery cluster are connected in series and then connected in parallel to a direct current bus of the DC/AC converter, and the input end of the DC/DC converter is connected in parallel with a power supply.
The grid-connected control strategy is as follows: the DC bus voltage is controlled by a DC/AC converter, and the DC/AC converter dynamically adjusts the DC bus voltage according to the information such as the state of charge of the energy storage system and the like. The energy management unit distributes power instruction values to the energy storage branches according to information such as the health state and the charge state of a battery cluster in the energy storage branches, the power of the energy storage branches is the product of the direct-current bus voltage and the current of the energy storage branches, and the energy storage branches are controlled to output current to control the power of the energy storage branches; the output current of the energy storage branch circuit is adjusted by controlling the voltage of the filter inductor, the voltage of the filter inductor is the sum of the voltage of the battery cluster and the output voltage of the DC/DC converter minus the voltage of the DC/AC converter DC bus, the output voltage of the DC/DC converter is controlled to adjust the voltage on the filter inductor, and therefore the current of the filter inductor is controlled to adjust the output power of the energy storage branch circuit.
The DC/DC converter only needs to output the difference voltage between the voltage of the direct current bus and the voltage of the battery cluster, so that the output voltage of the DC/DC converter is very low relative to the whole direct current bus, and the hardware cost and the loss can be greatly reduced.
The DC/DC converter adopts an isolated or non-isolated topological structure with power flowing in two directions. The power supply connected in parallel at the input side of the DC/DC converter can be an energy storage device such as a battery and a super capacitor, can also be a part of batteries in an energy storage branch or a direct current end of an AC/DC converter directly connected with a power grid, and the DC/DC converter and the power supply can also be replaced by the AC/DC converter directly connected with the power grid as a whole.
Drawings
Fig. 1 is a structural diagram of a conventional battery energy storage system.
FIG. 2 is a system topology diagram of an embodiment of the present invention;
FIG. 3 is a non-isolated half bridge circuit in an embodiment of the present invention;
FIG. 4 is an isolated dual active bridge converter circuit in an embodiment of the present invention;
Detailed Description
The invention is further described with reference to the following figures and detailed description.
The topology of the common energy storage system is shown in fig. 1, the common energy storage system adopts a scheme that batteries are connected in series to form a battery cluster, and a plurality of battery clusters are connected in parallel at a direct current bus of a DC/AC converter. Because the characteristics of each battery cluster are different, the charging and discharging power of each battery cluster is uneven, and the whole machine needs to be stopped as long as one battery works abnormally, so the reliability is low, and the utilization rate of the battery is not high.
As shown in fig. 2, the present invention provides a topology of a string-type battery energy storage system, where the string-type battery energy storage system is composed of a DC/AC converter and a plurality of energy storage branches, and a DC bus of the DC/AC converter is connected in parallel with the plurality of energy storage branches; the energy storage branch is composed of a filter inductor, a DC/DC converter, a power supply and a battery cluster. The filter inductor, the output end of the DC/DC converter and the battery cluster are connected in series and then connected in parallel to a direct current bus of the DC/AC converter, and the input end of the DC/DC converter is connected in parallel with a power supply.
In the embodiment of the present invention, the power bidirectional flowing DC/DC converter may be a non-isolated half-bridge converter (as shown in fig. 3, the half-bridge converter is formed by connecting two reverse conducting switches, i.e., a first switch K1 and a second switch K2 in series, wherein an emitter of the first switch K1 is connected to a collector of the second switch K2 to form a first output port O1, an emitter of the K2 is connected to a second input port I2 and a second output port O2, and a collector of the first switch K1 forms a first input port I1), or an isolated dual active bridge power converter (as shown in fig. 4, wherein I1 and I2 are a first input port and a second input port of the dual active bridge power converter, and O1 and O2 are a first output port and a second output port of the dual active bridge power converter), or another power bidirectional flowing DC/DC converter. The power supply at the input side of the DC/DC converter may be an energy storage module formed by energy storage elements such as a battery and a super capacitor, or may be a part of batteries in a battery cluster in the energy storage branch or a DC end of an AC/DC converter directly connected to a power grid, and the DC/DC converter and the power supply may also be replaced by an AC/DC converter connected to the power grid as a whole.
The implementation process of the topology work provided by the invention comprises the following steps: the DC/AC converter controls the voltage of a direct current bus, the DC/AC converter dynamically adjusts the voltage of the direct current bus according to information such as the state of charge of an energy storage system, the energy management unit distributes power instruction values to each energy storage branch according to the battery health state and the state of charge of the energy storage branches, and the DC/DC converter controls output voltage to adjust output current of the energy storage branches, so that the output power of the energy storage branches is controlled to track a given power instruction.
Because the DC/DC converter only needs to output the voltage of the difference between the voltage of the direct-current bus and the voltage of the battery cluster, the DC/DC converter with lower output voltage grade can be used, the output power of the DC/DC converter is also low, and therefore the input power supply of the DC/DC converter can be an energy storage module formed by energy storage elements such as a battery with lower capacity and lower voltage grade, a super capacitor and the like or a part of batteries in the battery cluster, and can also be a direct-current end of an AC/DC converter connected with a power grid, so that the power of the high-power battery cluster is controlled by the DC/DC converter with low capacity. Therefore, the cost and the loss of the DC/DC converter are greatly reduced, and the efficiency is improved.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but various changes may be apparent to those skilled in the art, and it is intended that all inventive concepts utilizing the inventive concepts set forth herein be protected without departing from the spirit and scope of the present invention as defined and limited by the appended claims.
Claims (6)
1. A kind of group string battery energy storage system, its technical characteristic is, this group string battery energy storage system is made up of DC/AC converter and multiple energy storage branch road, the AC side of DC/AC converter links with electric wire netting, the direct current bus of DC/AC converter connects multiple energy storage branch road in parallel; each energy storage branch consists of a filter inductor, a DC/DC converter, a power supply and a battery cluster; the filter inductor, the output end of the DC/DC converter and the battery cluster are connected in series and then connected in parallel to a direct current bus of the DC/AC converter, and the input end of the DC/DC converter is connected in parallel with a power supply.
2. The string battery energy storage system of claim 1, wherein the DC/DC converter is an isolated or non-isolated DC/DC converter with bi-directional power flow.
3. The string battery energy storage system of claim 1, wherein the battery cluster may also be an energy storage module comprising other energy storage elements such as a super capacitor.
4. The battery energy storage system of claim 1, wherein the power supply at the input side of the DC/DC converter may be an energy storage module formed by energy storage elements such as batteries and super capacitors, or may be a part of batteries in the battery cluster of the energy storage branch or a DC terminal of an AC/DC converter directly connected to the power grid, and the DC/DC converter and the power supply may also be replaced as a whole by an AC/DC converter directly connected to the power grid.
5. The string battery energy storage system of claim 1, wherein the DC/DC converter only needs to output the voltage of the difference between the DC bus capacitor voltage and the battery cluster voltage, so that a DC/DC converter with low output voltage level and low power can be used.
6. The string battery energy storage system of claim 1, wherein the DC bus voltage is controlled by a DC/AC converter, the DC/AC converter dynamically adjusts the DC bus voltage according to the state of charge of the energy storage system, the output voltage of the DC/DC converter in the energy storage branch is controlled to adjust the current on the filter inductor, and further adjust the output power of the battery clusters, and the output current of each battery cluster is independently adjusted by the DC/DC converter in the energy storage branch, thereby providing high flexibility.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211250265.8A CN115483695A (en) | 2022-10-13 | 2022-10-13 | Group string type battery energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211250265.8A CN115483695A (en) | 2022-10-13 | 2022-10-13 | Group string type battery energy storage system |
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| Publication Number | Publication Date |
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| CN115483695A true CN115483695A (en) | 2022-12-16 |
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| CN202211250265.8A Pending CN115483695A (en) | 2022-10-13 | 2022-10-13 | Group string type battery energy storage system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115663974A (en) * | 2022-11-21 | 2023-01-31 | 宁波芯合为一电子科技有限公司 | Control method and device for mobile energy storage type pulse welding power supply |
| CN116054355A (en) * | 2023-03-29 | 2023-05-02 | 深圳市首航新能源股份有限公司 | Energy storage system and power grid system thereof |
| CN117977772A (en) * | 2024-04-01 | 2024-05-03 | 惠州市乐亿通科技股份有限公司 | Household load power supply method and device and battery charging method and device |
-
2022
- 2022-10-13 CN CN202211250265.8A patent/CN115483695A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115663974A (en) * | 2022-11-21 | 2023-01-31 | 宁波芯合为一电子科技有限公司 | Control method and device for mobile energy storage type pulse welding power supply |
| CN116054355A (en) * | 2023-03-29 | 2023-05-02 | 深圳市首航新能源股份有限公司 | Energy storage system and power grid system thereof |
| CN116054355B (en) * | 2023-03-29 | 2023-08-04 | 深圳市首航新能源股份有限公司 | Energy storage system and power grid system thereof |
| CN117977772A (en) * | 2024-04-01 | 2024-05-03 | 惠州市乐亿通科技股份有限公司 | Household load power supply method and device and battery charging method and device |
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