CN113629693B - Direct-current direct access system of energy storage battery - Google Patents
Direct-current direct access system of energy storage battery Download PDFInfo
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- CN113629693B CN113629693B CN202110738804.1A CN202110738804A CN113629693B CN 113629693 B CN113629693 B CN 113629693B CN 202110738804 A CN202110738804 A CN 202110738804A CN 113629693 B CN113629693 B CN 113629693B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 100
- 238000010248 power generation Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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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
- H02J3/381—Dispersed generators
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention belongs to the field of electric power energy storage, and provides an energy storage battery direct current direct access system, which comprises a modularized multi-level energy storage battery system, wherein the modularized multi-level energy storage battery system is formed by connecting a battery cluster or a plurality of battery clusters in parallel, the battery cluster is formed by connecting a battery pack or a plurality of battery packs in series, at least one half-bridge type battery pack is arranged in the battery cluster, the half-bridge type battery pack is formed by a battery pack and a half-bridge module, a direct current output port of the battery pack is connected with a direct current port of the half-bridge module in parallel, an alternating current output port of the half-bridge module is an output port of the half-bridge type battery pack, and a positive direct current bus and a negative direct current bus of the modularized multi-level energy storage battery system are respectively and directly connected with a positive direct current bus and a negative direct current bus of an external direct current system. The direct-current direct access system of the energy storage battery is used for directly accessing the energy storage battery system to an external direct-current system, and intermediate links such as a direct-current/direct-current converter and the like are omitted.
Description
Technical Field
The invention belongs to the field of electric power energy storage, and particularly relates to an energy storage battery direct current direct access system which is used for directly accessing an energy storage battery system to an external direct current system, and intermediate links such as a direct current/direct current converter and the like are omitted.
Background
In recent years, the specific gravity of wind power generation and photovoltaic power generation in an electric power system is increased in large scale, and in order to resist the problems of intermittence and fluctuation caused by large-scale new energy power generation, electric power energy storage is an indispensable part of the electric power system in the future.
In the field of light and storage integration and other fields, an energy storage battery system is generally required to be connected to other direct current systems such as a direct current output side of a photovoltaic power generation system, so that the problem of power fluctuation of other new energy power generation systems such as photovoltaic power generation is stabilized by the energy storage battery system on the direct current side.
The existing energy storage battery system is generally formed by connecting a plurality of battery cells in series and in parallel to form a battery pack, and then connecting a plurality of battery packs in series to form a battery system, wherein the battery system is generally provided with a battery management system to balance the charge states of different battery cells in the same battery pack and balance the charge states of different battery packs in the same battery pack. The existing energy storage battery system cannot adjust the direct current port voltage of the energy storage battery system, and an external direct current/direct current converter is usually required to adjust the direct current port voltage of the energy storage battery system, so that the direct current port voltage of the energy storage battery system is matched with the direct current voltage of an external direct current system, and the power and the electric energy exchanged between the energy storage battery system and the external direct current system are adjusted.
The disadvantages of the prior art are:
1. an additional direct current/direct current converter is required to be equipped for the energy storage battery system, so that the primary investment cost and the loss of the system are increased;
2. The direct current/direct current converter can only adjust the total voltage value of the direct current port of the energy storage battery system so as to adjust the power and the electric quantity exchanged between the whole energy storage battery system and the external direct current system, and can not adjust the power and the electric quantity exchanged between each battery cluster and each battery pack and the external direct current system.
Disclosure of Invention
In order to improve the defects of the prior art, the invention provides a direct current access system of an energy storage battery, which is used for directly accessing the energy storage battery to an external direct current system, omits other intermediate links such as a direct current/direct current converter and the like between the energy storage battery and the external direct current system, and solves the problems of high cost and high loss caused by the additional configuration of the direct current/direct current converter for accessing the energy storage battery to the external direct current system.
In order to achieve the above purpose, the invention provides a direct current access system of an energy storage battery, which comprises a modularized multi-level energy storage battery system, wherein the modularized multi-level energy storage battery system is formed by connecting a battery cluster or a plurality of battery clusters in parallel, the battery cluster is formed by connecting a battery pack or a plurality of battery packs in series, at least one half-bridge type battery pack is arranged in the battery cluster, the half-bridge type battery pack is formed by a battery pack and a half-bridge module, a direct current output port of the battery pack is connected with a direct current port of the half-bridge module in parallel, an alternating current output port of the half-bridge module is an output port of the half-bridge type battery pack, and the battery pack can be put into or cut off by controlling the switching tube of the half-bridge module to be switched on or off, so that the voltage of the battery cluster is changed. The number of output levels of the battery clusters can be changed by changing the number of battery packs put into each battery cluster, so that the battery cluster is called a modularized multi-level energy storage battery system. The positive direct current bus and the negative direct current bus of the modularized multi-level energy storage battery system are respectively and directly connected with the positive direct current bus and the negative direct current bus of the external direct current system, so that the modularized multi-level energy storage battery system can directly exchange electric energy with the external direct current system.
The switching transistor may be a known fully controlled power electronic device such as a Metal-Oxide-semiconductor field effect transistor (MOSFET), or an insulated gate bipolar transistor (IGBT, insulated Gate Bipolar Transistor).
The battery pack is formed by connecting one or more battery cells in series, and the battery pack can also be formed by connecting one or more battery cells in series and parallel.
In the above technical scheme, the half-bridge battery pack comprises a battery pack, a first switch group and a second switch group, wherein the low-voltage end of the first switch group is connected with the high-voltage end of the second switch group, the leading-out terminal at the connection point is a first output port of the battery pack, the low-voltage end of the second switch group is connected with the low-voltage end of the battery pack, the leading-out terminal at the connection point is a second output port of the battery pack, and the high-voltage end of the first switch group is connected with the high-voltage end of the battery pack.
In the above technical solution, the battery cluster includes one or more full-bridge battery packs, where each full-bridge battery pack is composed of a battery pack and a full-bridge module, and positive and negative dc ports of the battery pack are connected to positive and negative dc ports of the full-bridge module, and an ac output port of the full-bridge module is an output port of the full-bridge battery pack and is used for being connected in series with one or more other battery packs.
In the above technical scheme, the full-bridge battery pack comprises a battery pack, a first switch group, a second switch group, a third switch group and a fourth switch group, wherein the low-voltage end of the first switch group is connected with the high-voltage end of the second switch group, the leading-out terminal at the connection point is a first output port of the battery pack, the low-voltage end of the third switch group is connected with the high-voltage end of the fourth switch group, the leading-out terminal at the connection point is a second output port of the battery pack, the high-voltage end of the first switch group, the high-voltage end of the third switch group and the high-voltage end of the battery pack are connected together, and the low-voltage end of the second switch group, the low-voltage end of the fourth switch group and the low-voltage end of the battery pack are connected.
In the above technical solution, the output voltage of the full-bridge module is adjusted to be negative voltage, zero voltage or positive voltage, so that the battery pack connected with the full-bridge module in parallel outputs the negative voltage, zero voltage or positive voltage, thereby expanding the direct-current voltage output range of the battery cluster.
In the above technical scheme, the power and the electric quantity exchanged between the modularized multi-level energy storage battery system and the external direct current system are regulated by changing the number of the battery packs put into each battery cluster of the modularized multi-level energy storage battery system to change the direct current output voltage of the modularized multi-level energy storage battery system.
In the technical scheme, one or more battery packs in each battery cluster in the modularized multi-level energy storage battery system are operated in a pulse width modulation mode, so that the output voltage of the battery packs is regulated in a closed loop mode, and the output direct current voltage of the battery clusters can be continuously regulated and controlled.
In the invention, the direct current side of the modularized multi-level energy storage battery system is directly connected with the direct current side of the photovoltaic inverter of the photovoltaic power generation system to form a direct current side light storage direct integrated system.
In general, compared with the conventional scheme of connecting the energy storage battery to other direct current systems through the direct current/direct current converter, the direct current connection system of the energy storage battery has the following beneficial effects:
(1) The DC/DC converter which is additionally arranged and is required by the conventional battery system to be connected to other DC systems is omitted, so that the investment cost is reduced, and the cost of the DC/DC converter which is required to be configured and is required to be connected to the external DC system by the conventional energy storage battery system is about 750 ten thousand yuan by taking a 50MW/100MWh energy storage system as an example;
(2) Because the direct current/direct current converter is not required to be configured, the invention can effectively reduce the system loss, taking a 50MW/100MWh energy storage system as an example, 3000 times of circulating charge and discharge, and the loss can be saved, and the cost is 112.5 ten thousand yuan.
Drawings
Fig. 1 is a schematic diagram of a conventional energy storage battery dc access system, wherein 21 is a conventional energy storage battery system, 7 is a dc positive bus of the energy storage battery system, 8 is a dc negative bus of the energy storage battery system, 9 is an external dc positive bus, 10 is an external dc negative bus, and 11 is a dc/dc converter.
Fig. 2 is a topological schematic diagram of a direct current direct access system of an energy storage battery, wherein 1 is a modularized multi-level energy storage battery system, 2 is a battery pack, 3 is a battery pack, 4 is a battery cluster, 5 is a half-bridge module, 6 is an isolating switch, 7 is a direct current positive bus of the energy storage battery system, 8 is a direct current negative bus of the energy storage battery system, 9 is an external direct current positive bus of the direct current system, and 10 is an external direct current negative bus of the direct current system.
Fig. 3 is a direct-current side-light storage direct-integration system proposed by the invention, wherein 1 is a modularized multi-level energy storage battery system, 9 is a public positive direct-current bus, 10 is a public negative direct-current bus, 12 is a photovoltaic cell panel, 13 is a direct-current combiner box and a maximum power point tracking controller, 14 is a photovoltaic inverter, 15 is an alternating-current transformer, and 16 is an alternating-current power grid.
Fig. 4 is a conventional optical storage direct current integrated system, 21 is a conventional energy storage battery system, 7 is an energy storage battery system direct current positive bus, 8 is an energy storage battery system direct current negative bus, 11 is a direct current/direct current converter, 12 is a photovoltaic cell panel, 13 is a photovoltaic direct current combiner box and a maximum power point tracking controller, 9 is a common positive direct current bus, 10 is a common negative direct current bus, 14 is a photovoltaic inverter, 15 is an alternating current transformer, and 16 is an alternating current power grid.
Fig. 5 is a topological schematic diagram of a direct current access system of an energy storage battery of the invention, wherein 1 is a modularized multi-level energy storage battery system, 2 is a battery pack, 3 is a battery pack, 4 is a battery cluster, 25 is a full bridge module, 6 is an isolating switch, 7 is a direct current positive bus of the energy storage battery system, 8 is a direct current negative bus of the energy storage battery system, 9 is an external direct current positive bus of the energy storage battery system, and 10 is an external direct current negative bus of the energy storage battery system.
Fig. 6 is a direct-current side-light storage direct-integrated system II provided by the invention, wherein 1 is a modularized multi-level energy storage battery system, 9 is a public positive direct-current bus, 10 is a public negative direct-current bus, 12 is a photovoltaic cell panel, 13 is a direct-current combiner box and a maximum power point tracking controller, 14 is a photovoltaic inverter, 15 is an alternating-current transformer, and 16 is an alternating-current power grid.
Fig. 7 is a circuit connection diagram of a half-bridge type battery pack, in which 2 is a battery pack, 3 is a battery pack, 5 is a half-bridge module, 31 is a first switch group, and 32 is a second switch group.
Fig. 8 is a circuit connection diagram of a full-bridge battery pack, wherein 2 is a battery pack, 3 is a battery pack, 25 is a full-bridge module, 33 is a full-bridge module first switch group, 34 is a full-bridge module second switch group, 35 is a full-bridge module third switch group, and 36 is a full-bridge module fourth switch group.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Fig. 1 is a schematic diagram of a dc access topology of a conventional energy storage battery, in which a dc positive bus and a dc negative bus of a conventional energy storage battery system 21 are connected to the positive and negative poles of an input end of a dc/dc converter 11, and a dc output end of the dc/dc converter 11 is connected to a dc positive bus and a dc negative bus of an external dc system.
Fig. 2 is a schematic diagram of an energy storage direct current direct access system according to an embodiment of the present invention, wherein the output end of each battery pack 2 is connected in parallel with a half-bridge module 5 to form a battery pack 3, one or more battery packs 3 are connected in series to form a battery cluster 4, one or more battery clusters 4 are connected in parallel to form a modularized multi-level energy storage battery system 1, and a direct current positive bus and a direct current negative bus of the modularized multi-level energy storage battery system 1 are directly connected to a direct current positive bus and a direct current negative bus of an external direct current system respectively.
Comparing fig. 1 and 2, it can be seen that the conventional energy storage battery system 21 of fig. 1 needs to be coupled to a direct current positive bus of an external direct current system through a direct current/direct current converter 11, while the energy storage battery of fig. 2 can be directly connected to the external direct current system. The technical scheme of the embodiment of the invention can reduce the primary investment cost and the operation loss brought by the direct current/direct current converter in the technical scheme of fig. 1 because the direct current/direct current converter 11 is omitted.
As a specific application scenario of the present invention, fig. 3 shows a direct-current side-light storage direct integrated system topology, after the photovoltaic panels 12 are collected by the direct-current combiner box maximum power point tracking controller 13, they are connected to the common positive direct-current bus 9 and the common negative direct-current bus 10, the positive and negative direct-current buses of the modular multi-level energy storage battery system 1 are correspondingly connected to the common positive direct-current bus 9 and the common negative direct-current bus 10, the common positive direct-current bus 9 and the common negative direct-current bus 10 are connected to the positive and negative poles of the photovoltaic inverter 14, and the ac side of the photovoltaic inverter 14 is connected to the ac power grid through the ac transformer 15. In fig. 3, the outputs of the modularized multi-level energy storage battery system 1 and the photovoltaic cell panel 12 are directly collected on the direct current side, so that a direct current side light storage direct integrated system is formed.
In comparison, fig. 4 shows an implementation manner of a conventional light-storage direct-current integrated system, a conventional energy-storage battery system 21 is connected to a public positive direct-current bus 9 and a public negative direct-current bus 10 through a direct-current/direct-current converter 11, a photovoltaic cell panel 12 is also connected to the public positive direct-current bus 9 and the public negative direct-current bus 10 after direct current is collected through a direct-current collecting box maximum power point tracking controller 13, so that the conventional energy-storage battery system 21 and the photovoltaic cell panel 21 form an integrated system on a direct-current side through a certain direct-current link, the public positive direct-current bus 9 and the public negative direct-current bus 10 are connected to a direct-current side of a photovoltaic inverter 14, and an alternating-current side of the photovoltaic inverter 14 is connected to an alternating-current power grid 16 through an alternating-current transformer 15.
As can be seen from comparing fig. 4 and fig. 3, in the conventional light-storage direct-current integrated system of fig. 4, the conventional energy-storage battery system 21 needs to be connected to the common positive dc bus 9 and the common negative dc bus 10 through the dc/dc converter 11, while in the direct-side light-storage direct-integrated system of fig. 3, the direct-current side of the modularized multi-level energy-storage battery system 1 is directly connected to the common positive dc bus 9 and the common negative dc bus 10, and the intermediate link does not need to pass through the dc/dc converter. Because the direct current/direct current converter between the energy storage battery system and the public direct current bus is omitted, compared with the system in fig. 4, the direct current side light energy storage direct integrated system can greatly save investment cost and operation loss.
Fig. 5 shows another embodiment similar to fig. 2, and fig. 5 is basically identical to fig. 2, except that the output ends of one or more battery packs in the battery cluster 4 are connected with the full-bridge module 25 in parallel, so that the battery pack connected with the full-bridge module 25 in parallel can output a negative level, a zero level or a positive level, and the direct-current voltage output range of the battery cluster 4 is enlarged. The positive and negative dc ports of the battery pack 2 are connected to the positive and negative dc ports of the full-bridge module 25, and the output port of the full-bridge module is the output port of the battery pack 3, and is used for being connected in series with one or more other battery packs 3.
Fig. 6 shows another embodiment similar to fig. 3, and fig. 6 is similar to fig. 3, except that the output ends of one or more battery packs in the battery cluster 4 are connected with the full-bridge module 25 in parallel, so that the battery pack connected with the full-bridge module 25 in parallel can output a negative level, a zero level or a positive level, and the direct-current voltage output range of the battery cluster 4 is enlarged.
Fig. 7 shows an implementation of a half-bridge battery, where the low voltage end of the first switch bank 31 (also called emitter or drain depending on the type of fully-controlled power electronics applied) is coupled to the high voltage end of the second switch bank 32 (also called collector or source depending on the type of fully-controlled power electronics applied), where the low voltage end of the second switch bank 32 is coupled to the low voltage end of the battery pack 2, and where the high voltage end of the first switch bank 31 is coupled to the high voltage end of the battery pack 2.
Fig. 8 shows an implementation manner of the full-bridge battery pack, wherein the low-voltage end of the first switch group 33 of the full-bridge module is connected with the high-voltage end of the second switch group 34 of the full-bridge module, the leading-out terminal at the connection point is a first output port of the battery pack 3, the low-voltage end of the third switch group 35 of the full-bridge module is connected with the high-voltage end of the fourth switch group 36 of the full-bridge module, the leading-out terminal at the connection point is a second output port of the battery pack 3, the high-voltage end of the first switch group 33 of the full-bridge module, the high-voltage end of the third switch group 35 of the full-bridge module and the high-voltage end of the battery pack 2 are connected together, and the low-voltage end of the second switch group 34 of the full-bridge module, the fourth switch group 36 of the full-bridge module and the low-voltage end of the battery pack 2 are connected.
In summary, the invention provides the direct-current direct-access system of the energy storage battery, wherein the direct-current side of the energy storage battery is directly accessed to the direct-current bus of the external direct-current system, so that the direct-current/direct-current converter embedded between the energy storage battery and the external direct-current system in the conventional direct-current access system of the energy storage battery is omitted. The technical scheme provided by the invention has the advantages that:
(1) The investment of the direct current/direct current converter is saved;
(2) High operation loss caused by the direct current/direct current converter is avoided;
(3) The output voltage of each battery cluster in the energy storage battery system and the output voltage of the battery pack in each battery cluster can be regulated and controlled so as to smooth the power and energy exchanged between the energy storage battery and an external direct current system;
(4) In the whole, the energy storage direct current access system provided by the invention saves investment and operation loss, improves the control performance of the system, takes a 50MW/100MWh energy storage system as an example, can save the cost of a direct current/direct current converter in a conventional energy storage direct current access system to be about 750 ten thousand yuan, takes a 50MW/100MWh energy storage system as an example, and takes 3000 times of cyclic charge and discharge as an example, the loss which can be saved by the energy storage direct current access system is 112.5 ten thousand yuan.
What is not described in detail in this specification is prior art known to those skilled in the art.
The above description is only of the preferred embodiments of the present invention, which are easily understood by those skilled in the art, and is not intended to limit the present invention, and any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (1)
1. The direct current direct access system of the energy storage battery is characterized in that: the modularized multi-level energy storage battery system comprises a plurality of battery clusters in parallel, wherein the battery clusters are formed by connecting a plurality of battery packs in series, at least one half-bridge type battery pack is arranged in each battery cluster, each half-bridge type battery pack comprises a battery pack and a half-bridge module, a direct current output port of each battery pack is connected with a direct current port of each half-bridge module in parallel, an alternating current output port of each half-bridge module is an output port of each half-bridge type battery pack, and a positive electrode direct current bus and a negative electrode direct current bus of the modularized multi-level energy storage battery system are respectively and directly connected with a positive electrode direct current bus and a negative electrode direct current bus of an external direct current system, so that the modularized multi-level energy storage battery system can directly exchange electric energy with the external direct current system;
The half-bridge type battery pack comprises a battery pack, a first switch group and a second switch group, wherein the low-voltage end of the first switch group is connected with the high-voltage end of the second switch group, the leading-out terminal at the connection point is a first output port of the battery pack, the low-voltage end of the second switch group is connected with the low-voltage end of the battery pack, the leading-out terminal at the connection point is a second output port of the battery pack, and the high-voltage end of the first switch group is connected with the high-voltage end of the battery pack;
the battery cluster comprises one or more full-bridge battery packs, the full-bridge battery packs are composed of battery packs and full-bridge modules, the positive and negative direct current ports of the battery packs are connected to the positive and negative direct current ports of the full-bridge modules, and the alternating current output ports of the full-bridge modules are output ports of the full-bridge battery packs and are used for being connected with one or more other battery packs in series;
The full-bridge battery pack comprises a battery pack, a first switch group, a second switch group, a third switch group and a fourth switch group, wherein the low-voltage end of the first switch group is connected with the high-voltage end of the second switch group, the leading-out terminal at the connection point is a first output port of the battery pack, the low-voltage end of the third switch group is connected with the high-voltage end of the fourth switch group, the leading-out terminal at the connection point is a second output port of the battery pack, the high-voltage end of the first switch group, the high-voltage end of the third switch group and the high-voltage end of the battery pack are connected together, and the low-voltage end of the second switch group, the low-voltage end of the fourth switch group and the low-voltage end of the battery pack are connected;
The output voltage of the full-bridge module is regulated to be negative voltage, zero voltage or positive voltage, so that the battery pack connected with the full-bridge module in parallel outputs the negative voltage, the zero voltage or the positive voltage, and the direct-current voltage output range of the battery cluster is enlarged;
The method comprises the steps of adjusting power and electric quantity exchanged between a modularized multi-level energy storage battery system and an external direct current system by changing the number of battery packs put into each battery cluster of the modularized multi-level energy storage battery system to change direct current output voltage of the modularized multi-level energy storage battery system;
The method comprises the steps that one or more battery packs in each battery cluster in a modularized multi-level energy storage battery system work in a pulse width modulation mode, output direct-current voltage of each battery cluster is continuously regulated and controlled, and current exchanged between the modularized multi-level energy storage battery system and an external direct-current system is accurately controlled;
and directly connecting the direct current side of the modularized multi-level energy storage battery system in the energy storage battery direct current direct access system with the direct current side of the photovoltaic inverter of the photovoltaic power generation system to form a direct current side light storage direct integrated system.
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| DE102014110410A1 (en) * | 2014-07-23 | 2016-01-28 | Universität der Bundeswehr München | Modular energy storage direct converter system |
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