CN114884169A - Energy storage converter and battery energy storage system - Google Patents
Energy storage converter and battery energy storage system Download PDFInfo
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- CN114884169A CN114884169A CN202210577740.6A CN202210577740A CN114884169A CN 114884169 A CN114884169 A CN 114884169A CN 202210577740 A CN202210577740 A CN 202210577740A CN 114884169 A CN114884169 A CN 114884169A
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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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- 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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by 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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal 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
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal 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
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention discloses an energy storage converter and a battery energy storage system. The direct current side of the energy storage converter is connected to the two outer ends of the plurality of battery clusters connected in series, and the alternating current side output of the energy storage converter is connected to a power grid through a transformer; the energy storage converter comprises 6 power conversion units with the same structure, two input ends and a neutral point of each power conversion unit are respectively connected with a direct current positive bus, a direct current negative bus and a direct current zero bus, the output ends of the 6 power conversion units form three current loops in pairs, and a single-phase alternating current output by each current loop is connected to the secondary side of the transformer through a coupling inductor. The battery energy storage system comprises a transformer and a plurality of energy storage units, wherein the plurality of energy storage units are connected in parallel to the transformer; each energy storage unit comprises the energy storage converter and a plurality of battery clusters. The scheme of the invention can realize higher system voltage, reduce system loss and system cost, and can fundamentally eliminate common mode voltage.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an energy storage converter and a battery energy storage system.
Background
With the increasing demand for reducing the cost of the energy storage system, the strategy of reducing the cost by increasing the system voltage in the solar power generation technology is introduced into the battery energy storage system, so that the 1500V battery energy storage system is gradually generated on the basis of the common 1000V battery energy storage system, the corresponding alternating current grid-connected voltage is also increased, and the system capacity is increased under the condition of equal conversion current.
Fig. 1 shows a schematic diagram of a battery energy storage system in the prior art. As shown in fig. 1, the battery energy storage System includes a plurality of energy storage units connected in parallel, and each energy storage unit is composed of a battery cluster and a Power Conversion System (PCS).
Fig. 2 shows a general block diagram of an energy storage converter in a 1500V battery energy storage system of the prior art. As shown in fig. 2, each energy storage converter includes 3 power conversion units connected in parallel, each power conversion unit adopts a widely-used NPC (Neutral Point Clamped) three-level topology structure, each power conversion unit outputs a phase voltage, three phase voltages output by the three power conversion units sequentially pass through the filtering unit and the power distribution unit and then are connected to the secondary side of the transformer, and the primary side of the transformer outputs three-phase alternating current externally.
In the process of implementing the invention, the inventor finds that the 1500V battery energy storage system in the prior art has at least the following problems:
1) the existing 1500V battery energy storage system is to promote the DC bus voltage from 1000V to 1500V, but can not realize higher system voltage, and is limited by the DC voltage range, the AC voltage can not be promoted, the system voltage is low, the current is large, and the loss is high.
2) Three power conversion units in the energy storage converter respectively output one phase of three-phase alternating current, common-mode voltage of each phase cannot be avoided, Electromagnetic Interference on front and rear-stage equipment is serious, a large amount of Electromagnetic Interference (EMI) equipment needs to be added to avoid the Interference, and the cost is high.
Disclosure of Invention
The invention aims to provide an energy storage converter and a battery energy storage system, which can realize higher system voltage, reduce system loss and system cost and fundamentally eliminate common-mode voltage.
According to the energy storage converter provided by the embodiment of the invention, the direct current side of the energy storage converter is connected to the two outer ends of a plurality of battery clusters connected in series, and the alternating current side output of the energy storage converter is connected to a power grid through a transformer;
the energy storage converter comprises 6 power conversion units with the same structure, two input ends and a neutral point of each power conversion unit are respectively connected with a direct current positive bus, a direct current negative bus and a direct current zero bus, the output ends of the 6 power conversion units form three current loops in pairs, and a single-phase alternating current output by each current loop is connected to the secondary side of the transformer through a coupling inductor.
Optionally, the dc side of the energy storage converter is connected to two outer ends of two battery clusters connected in series, and the voltage level of each battery cluster is 1000V.
Optionally, the power conversion unit adopts topologies including, but not limited to, 2-level, 3-level, and 5-level, 7-level, and 9-level topologies may also be implemented by the modulation scheme.
Optionally, the energy storage converter further includes three groups of filtering units, and each group of filtering units is connected in parallel with one coupling inductor and is used for filtering harmonic interference in the corresponding single-phase alternating current. Each group of filtering units is a single-phase filter, including but not limited to an LC filter and an LCL filter.
Optionally, the energy storage converter further includes three groups of ac power distribution units, each group of ac power distribution units is connected in parallel with one coupling inductor, and is configured to gate or cut off corresponding single-phase ac power.
Optionally, the energy storage converter further includes two groups of dc power distribution units, and each group of dc power distribution units is connected in parallel with one of the battery clusters and is used for gating or cutting off the corresponding battery cluster.
Optionally, each group of the ac power distribution units or each group of the dc power distribution units includes a protection device and a switching device.
Optionally, the energy storage converter further includes two sets of dc capacitors connected in series, and two outer end points and connection points of the two sets of dc capacitors are respectively connected to the dc positive bus, the dc negative bus, and the dc zero bus, and are used for filtering the dc power supply and providing energy storage support.
The battery energy storage system provided by the embodiment of the invention comprises a transformer and a plurality of energy storage units, wherein the plurality of energy storage units are connected in parallel to the transformer; each energy storage unit comprises the energy storage converter and a plurality of battery clusters.
By adopting the technical scheme, the embodiments of the invention can achieve the following beneficial effects:
according to the energy storage converter and the battery energy storage system provided by the embodiment of the invention, on one hand, because the direct current side of the energy storage converter is connected to the two outer ends of a plurality of battery clusters connected in series, a higher system voltage can be realized by utilizing the battery clusters with the existing voltage grade, under the condition of the same current, the system capacity is improved, the system loss is greatly reduced, the system efficiency is correspondingly improved, under the same capacity, the voltage of the battery clusters is improved, the cluster number is reduced, the number of direct current cables between the battery clusters and the energy storage converter can be reduced by more than 25%, so that the battery cluster control unit of the system is reduced, and the cost of a battery management system is reduced; on the other hand, the energy storage converter is internally connected in parallel through 6 power conversion units with the same structure, the output ends of every two power conversion units are connected together to form a current loop, each current loop outputs a single-phase alternating current, and the three single-phase alternating currents are respectively connected to the secondary side of the transformer through coupling inductors, so that the primary side of the transformer outputs three single-phase alternating currents instead of a three-phase alternating current, thereby fundamentally eliminating common-mode voltage and improving the electromagnetic compatibility characteristic of the system and the reliability of the system.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art to obtain other drawings according to these drawings. In the drawings:
fig. 1 shows a schematic diagram of a prior art battery energy storage system;
FIG. 2 shows a general block diagram of an energy storage converter in a 1500V battery energy storage system of the prior art;
fig. 3 is a schematic diagram of a structure of an energy storage converter according to an embodiment of the present invention;
fig. 4 shows various types of filtering units according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein.
The energy storage converter, also called a bidirectional energy storage inverter, is applied to alternating current coupling energy storage systems such as grid-connected energy storage and microgrid energy storage, is connected between a storage battery and a power grid, and is a device for realizing bidirectional conversion of electric energy. The direct current of the storage battery can be inverted into alternating current and is transmitted to a power grid for use; the alternating current of the power grid can be rectified into direct current to charge the storage battery.
Fig. 3 is a schematic structural diagram of an energy storage converter according to an embodiment of the present invention. Referring to fig. 3, in the energy storage converter according to the embodiment of the present invention, a direct current side of the energy storage converter is connected to two outer ends of a plurality of battery clusters connected in series, and an alternating current side of the energy storage converter is connected to a power grid through a transformer, so as to implement bidirectional conversion between direct current and alternating current.
The energy storage converter in the embodiment of the invention comprises 6 power conversion units with the same structure, two input ends and a neutral point of each power conversion unit are respectively connected with a direct current positive bus, a direct current negative bus and a direct current zero bus, the output ends of the 6 power conversion units are connected in pairs to form three current loops, and a single-phase alternating current output by each current loop is connected to the secondary side of a transformer through a coupling inductor.
The three single-phase alternating currents output by the three current loops can jointly use a three-phase coupling inductor, and can also respectively use an independent coupling inductor to be connected to the secondary side of the transformer, and the three single-phase alternating currents are externally output by the primary side of the transformer. Regarding the winding structure of the primary side connection power grid of the transformer, Y-connection or delta-connection may be selected, which is not limited in the embodiment of the present invention.
In one embodiment, the dc side of the energy storage converter is connected to the two outer ends of two series connected battery clusters, each battery cluster having a voltage level of 1000V. The voltage level of the series battery cluster can be increased from 1000V to 1000V +1000V to 2000V, so that a system voltage higher than 1500V can be obtained. Moreover, under the same capacity, the voltage of the battery cluster is increased, the number of clusters is reduced, the number of direct current cables between the battery cluster and the energy storage converter can be reduced by more than 25%, so that the number of battery cluster control units of the system is reduced, and the cost of the battery management system is reduced.
In fig. 2, an Insulated Gate Bipolar Transistor (IGBT) inside the power conversion unit is currently 1200V, and is satisfactory for use in a 1000V system, and in a 1500V system, a multi-level circuit is required, which is equivalent to two 1200V series connections, that is, 2400V voltages, but is not yet 1500V in practical application, so that waste is serious for the existing 1200V × 2 IGBT topology.
In the above embodiment, by connecting two 1000V battery clusters in series, a system voltage of 2000V can be realized, which is more suitable for the existing 1200V × 2 IGBT topology, and reduces waste. Therefore, the power conversion unit adopted by the energy storage converter in the embodiment of the invention in fig. 3 can directly adopt the power conversion unit in the existing 1500V energy storage converter in fig. 2, so that the energy storage converter in the embodiment of the invention is constructed by using the existing power conversion module.
It should be noted that each power conversion unit in fig. 2 adopts an "I" -shaped NPC three-level topology, but the power conversion unit in the energy storage converter according to the embodiment of the present invention is not limited to the "I" -shaped NPC three-level topology in fig. 2, and may be implemented by selecting multiple topologies, such as two-level, other three-level, and even five-level topologies, and may also implement a 5-level, 7-level, and 9-level topology by phase-staggered optimization of a modulation scheme. When the loop current is the same, the number of the levels is increased, the system loss is greatly reduced, the system efficiency is improved, the inductance in the filter unit is reduced, and the filter cost is correspondingly reduced.
In one embodiment, referring to fig. 3, the energy storage converter of the embodiment of the present invention further includes three sets of filtering units, where each set of filtering unit is connected in parallel with one coupling inductor and is used to filter harmonic interference in the corresponding single-phase alternating current.
In the embodiment of the invention, each group of filtering units is a single-phase filter and is used for inhibiting harmonic interference on a single-phase power line, filtering power clutter and providing a clean power utilization environment for a power supply system. Fig. 4 is a diagram of various options of a filtering unit provided in an embodiment of the present invention, and the filtering unit in an embodiment of the present invention may adopt various options, including but not limited to the LC filter and the LCL filter shown in fig. 4.
In one embodiment, referring to fig. 3, the energy storage converter of the embodiment of the invention further includes three groups of ac power distribution units, each group of ac power distribution units is connected in parallel with a coupling inductor for gating or cutting off the corresponding single-phase ac power.
In one embodiment, the energy storage converter in the embodiment of the present invention further includes a plurality of groups of dc power distribution units, and each group of dc power distribution units is connected in parallel with one battery cluster and is used to gate or cut off the corresponding battery cluster. Referring to fig. 3, the dc side of the energy storage converter is connected to two outer ends of two series-connected battery clusters, and each series-connected battery cluster is provided with a group of dc power distribution units in parallel for individually controlling the gating or the switching of the battery cluster.
Preferably, both the ac power distribution unit and the dc power distribution unit include a protection device and a switching device. Devices employed include, but are not limited to: binding post, circuit breaker, contactor, shunt, fuse, load switch, button switch, relay, pilot lamp and electric current, voltmeter. By selecting the matching scheme of the protection device and the switch device, the overall reliability of the system can be improved.
In one embodiment, the energy storage converter of the embodiment of the invention further includes two sets of dc capacitors connected in series, and two external endpoints and connection points of the two sets of dc capacitors are respectively connected to the dc positive bus, the dc negative bus and the dc zero bus, and are used for filtering the dc power supply and providing energy storage support.
It can be understood that the connection point of the two sets of dc capacitors is also the neutral point thereof, and the neutral point of the dc capacitor and the neutral point of each power conversion unit share the dc zero bus by connecting the connection point of the two sets of dc capacitors to the dc zero bus, so as to improve the filtering accuracy of the dc capacitor, enable the power conversion unit to output a better waveform, and improve the problem of electromagnetic interference (EMI).
The embodiment of the invention also provides a battery energy storage system, which belongs to the same technical concept as the energy storage converter and comprises a transformer and a plurality of energy storage units, wherein the plurality of energy storage units are connected in parallel to the transformer; each energy storage unit comprises the energy storage converter and a plurality of battery clusters.
In summary, according to the energy storage converter and the battery energy storage system of the embodiment of the invention, on one hand, since the dc side of the energy storage converter is connected to the two outer ends of the plurality of battery clusters connected in series, a higher system voltage can be realized by using the battery clusters of the existing voltage class, under the condition of the same current, the system capacity is improved, the system loss is greatly reduced, the system efficiency is correspondingly improved, and under the same capacity, the voltage of the battery clusters is improved, the number of clusters is reduced, the number of dc cables between the battery clusters and the energy storage converter can be reduced by more than 25%, so that the number of battery cluster control units of the system is reduced, and the cost of the battery management system is reduced; on the other hand, the energy storage converter is internally connected in parallel through 6 power conversion units with the same structure, the output ends of every two power conversion units are connected together to form a current loop, each current loop outputs a single-phase alternating current, and the three single-phase alternating currents are respectively connected to the secondary side of the transformer through coupling inductors, so that the primary side of the transformer outputs three single-phase alternating currents instead of a three-phase alternating current, thereby fundamentally eliminating common-mode voltage and improving the electromagnetic compatibility characteristic of the system and the reliability of the system.
It will be understood by those within the art that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present invention, and are not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. An energy storage converter is characterized in that the direct current side of the energy storage converter is connected to two outer ends of a plurality of battery clusters connected in series, and the alternating current side output of the energy storage converter is connected to a power grid through a transformer;
the energy storage converter comprises 6 power conversion units with the same structure, two input ends and a neutral point of each power conversion unit are respectively connected with a direct current positive bus, a direct current negative bus and a direct current zero bus, the output ends of the 6 power conversion units are connected in pairs to form three current loops, and a single-phase alternating current output by each current loop is connected to the secondary side of the transformer through a coupling inductor.
2. The energy storage converter according to claim 1,
the direct current side of the energy storage converter is connected to two outer ends of two battery clusters connected in series, and the voltage grade of each battery cluster is 1000V.
3. The energy storage converter according to claim 1, wherein the power conversion unit adopts topologies including but not limited to 2-level, 3-level and 5-level, 7-level and 9-level topologies can be realized by modulation scheme.
4. The energy storage converter according to claim 1, further comprising three sets of filtering units, each set of filtering units being connected in parallel with a coupling inductor for filtering harmonic interference in the corresponding single-phase alternating current.
5. The energy storage converter according to claim 4, wherein each group of filtering units is a single-phase filter, including but not limited to LC filter and LCL filter.
6. The energy storage converter according to claim 1, further comprising three groups of ac distribution units, each group of ac distribution units being connected in parallel with a coupling inductor for gating or cutting off the corresponding single-phase ac power.
7. The energy storage converter according to claim 1, further comprising a plurality of groups of dc power distribution units, each group of dc power distribution units being connected in parallel with one of the battery clusters for gating or switching off the corresponding battery cluster.
8. The energy storage converter according to claim 6 or 7, wherein each group of said AC distribution units or each group of said DC distribution units comprises a protection device and a switching device.
9. The energy storage converter according to claim 1, further comprising two sets of dc capacitors connected in series, wherein two external terminals and connection points of the two sets of dc capacitors are respectively connected to the dc positive bus, the dc negative bus and the dc zero bus for filtering the dc power and providing energy storage support.
10. A battery energy storage system comprises a transformer and a plurality of energy storage units, wherein the energy storage units are connected to the transformer in parallel; characterized in that each of said energy storage units comprises an energy storage converter according to any of claims 1-9 and a plurality of battery clusters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210577740.6A CN114884169A (en) | 2022-05-25 | 2022-05-25 | Energy storage converter and battery energy storage system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210577740.6A CN114884169A (en) | 2022-05-25 | 2022-05-25 | Energy storage converter and battery energy storage system |
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| CN114884169A true CN114884169A (en) | 2022-08-09 |
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| CN202210577740.6A Pending CN114884169A (en) | 2022-05-25 | 2022-05-25 | Energy storage converter and battery energy storage system |
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- 2022-05-25 CN CN202210577740.6A patent/CN114884169A/en active Pending
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