CN115800461A - Energy storage system, three-phase energy storage system and energy storage cabinet - Google Patents
Energy storage system, three-phase energy storage system and energy storage cabinet Download PDFInfo
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- CN115800461A CN115800461A CN202211583642.XA CN202211583642A CN115800461A CN 115800461 A CN115800461 A CN 115800461A CN 202211583642 A CN202211583642 A CN 202211583642A CN 115800461 A CN115800461 A CN 115800461A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 132
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 81
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims abstract description 39
- 102100031786 Adiponectin Human genes 0.000 claims description 67
- 101000775469 Homo sapiens Adiponectin Proteins 0.000 claims description 67
- 238000004804 winding Methods 0.000 claims description 46
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 28
- 229910052744 lithium Inorganic materials 0.000 claims description 28
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000000087 stabilizing effect Effects 0.000 claims description 12
- 230000001360 synchronised effect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 10
- 238000004891 communication Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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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
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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
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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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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application provides an energy storage system, three-phase energy storage system and energy storage cabinet, energy storage system includes: a bidirectional DCDC circuit; the bidirectional DCDC circuit comprises a first full-bridge circuit, a transformer circuit and a second full-bridge circuit; the second full-bridge circuit comprises at least one full-bridge sub-circuit; the first full-bridge circuit is connected with the primary side of the transformer circuit, the secondary side of the transformer circuit is connected with the full-bridge sub-circuit, and the second full-bridge circuit is used for being connected with the energy storage battery according to one or more full-bridge sub-circuits so as to adapt to the energy storage batteries with different voltages. The energy storage battery power supply system can be suitable for energy storage batteries with two voltage classes of 400VDC and 800VDC, and meanwhile the problem that circulation currents are easy to occur between energy storage cabinets connected in parallel can be solved.
Description
Technical Field
The application relates to the technical field of energy storage batteries, in particular to an energy storage system, a three-phase energy storage system and an energy storage cabinet.
Background
The energy storage system has practical requirements in the fields of industry, communication, medical treatment and the like for preventing sudden power failure. In the classification of the energy storage batteries, the specifications of two voltage levels of 400VDC and 800VDC are included, however, when a three-phase 380VAC energy storage system is obtained, the voltage range of the energy storage batteries must be between 680VDC and 1000VDC, so that only 800VDC battery packs can be used, for the battery packs with smaller voltage level specifications, a stacking mode is generally adopted, and a plurality of battery packs with smaller voltage level specifications are connected in series, so that the use is inconvenient; in addition, the lithium battery energy storage cabinet is a large-capacity battery system formed by directly stacking battery packs and then forms a battery energy storage cabinet, but the voltage of the battery energy storage cabinet is inconsistent due to different initial states of the batteries of the energy storage cabinets, and in the initial stage of parallel use of a plurality of energy storage cabinets, a cabinet with high voltage charges a cabinet with low voltage, namely, so-called circulation current, so that the normal work of the system is influenced.
Disclosure of Invention
In view of this, the embodiment of the application provides an energy storage system, a three-phase energy storage system and an energy storage cabinet, which can be suitable for energy storage batteries with two voltage class specifications of 400VDC and 800VDC, and can solve the problem that circulation is easy to occur between energy storage cabinets connected in parallel.
In a first aspect, an embodiment of the present application provides an energy storage system, including an energy storage battery, further including: a bidirectional DCDC circuit; the bidirectional DCDC circuit comprises a first full-bridge circuit, a transformer circuit and a second full-bridge circuit; the second full-bridge circuit comprises at least one full-bridge sub-circuit;
the first full-bridge circuit is connected with the primary side of the transformer circuit, and the secondary side of the transformer circuit is connected with the full-bridge sub-circuit;
the second full-bridge circuit is used for being connected with the energy storage battery according to one or more full-bridge sub-circuits so as to adapt to the energy storage batteries with different voltages.
In one possible embodiment, the second full-bridge circuit comprises a first full-bridge sub-circuit and a second full-bridge sub-circuit; the transformer circuit comprises a first winding and a second winding on a primary side, and a third winding and a fourth winding on a secondary side; the first winding and the third winding correspond to each other and the number of coils is equal; the second winding and the fourth winding correspond to each other and the number of the coils is equal.
In a possible embodiment, the third winding is connected to the first full-bridge sub-circuit, the fourth winding is connected to the second full-bridge sub-circuit, and the first full-bridge sub-circuit and the second full-bridge sub-circuit are respectively connected to the energy storage battery.
In one possible embodiment, the number of coils of the first winding, the second winding, the third winding and the fourth winding is equal.
In a possible implementation mode, the energy storage battery adopts a 400V lithium battery pack, the number of the full-bridge sub-circuits is two, and the two full-bridge sub-circuits are respectively connected with the 400V lithium battery pack in parallel.
In a possible implementation mode, the energy storage battery adopts an 800V lithium battery pack, the number of the full-bridge sub-circuits is two, and the two full-bridge sub-circuits are connected in series with the 800V lithium battery pack to form a loop.
In a possible embodiment, the energy storage system further comprises a controller and a current sensor;
the current sensor is connected in series in a primary side circuit of the transformer circuit and is connected with the controller; the first full-bridge circuit and the second full-bridge circuit are respectively connected with the controller.
The current sensor is used for detecting a resonant current signal of a primary side circuit of the transformer circuit and sending a detection result to the controller, so that the controller controls synchronous rectification of the first full-bridge circuit or the second full-bridge circuit.
In a second aspect, an embodiment of the present application further provides a three-phase energy storage system, including a bidirectional ACDC circuit, and the energy storage system of the first aspect; the bidirectional ACDC circuit adopts a three-level topology circuit;
the bidirectional ACDC circuit comprises an AC side and a DC side; the direct current side of the bidirectional ACDC circuit is connected with the first full-bridge circuit, and the bidirectional ACDC circuit is connected with the controller;
the controller is used for collecting voltage signals and current signals of an alternating current side and a direct current side of the bidirectional ACDC circuit and controlling output voltage or power factor of the bidirectional ACDC circuit.
In a possible implementation manner, a voltage stabilizing unit is arranged on the direct current side of the bidirectional ACDC circuit; the voltage stabilizing unit comprises a first voltage stabilizing capacitor, a second voltage stabilizing capacitor and a bidirectional DCDC voltage regulating module;
the first port of first steady voltage electric capacity is connected the first port of the direct current side of two-way ACDC circuit, the second port of first steady voltage electric capacity is connected the first port of second steady voltage electric capacity, the second port of second steady voltage electric capacity is connected the second port of the direct current side of two-way ACDC circuit, the first port of two-way DCDC voltage regulating module is connected the first port of first steady voltage electric capacity, the second port of two-way DCDC voltage regulating module is connected the second port of first steady voltage electric capacity, the third port of two-way DCDC voltage regulating module is connected the first port of the alternating current side of two-way ACDC circuit, the fourth port of two-way DCDC voltage regulating module is connected the second port of second steady voltage electric capacity.
In a possible implementation mode, the three-phase energy storage system further comprises a filter circuit and a pre-charging circuit;
the filter circuit is connected with the pre-charging circuit, and the pre-charging circuit is connected with the alternating current side of the bidirectional ACDC circuit.
In one possible embodiment, a boost circuit is provided for each phase on the ac side of the bidirectional ACDC circuit.
In a possible implementation manner, the three-phase energy storage system further includes an auxiliary power supply, an input end of the auxiliary power supply is connected to any one of the alternating current sides of the bidirectional ACDC circuit, and an output end of the auxiliary power supply is connected to the controller.
In a third aspect, an embodiment of the present application further provides an energy storage cabinet, including energy storage devices and peripheral circuit devices, where a system in the energy storage devices adopts the three-phase energy storage system according to any one of the second aspects.
The technical scheme provided by the application has the following beneficial effects:
the application provides an energy storage system, a primary side circuit and a secondary side circuit of a transformer circuit in a bidirectional DCDC circuit are changed into two groups of windings corresponding to each other, and two groups of sub power supply systems, namely a first full-bridge sub circuit and a second full-bridge sub circuit, are arranged on the secondary side of the transformer circuit, and can be respectively suitable for 400VDC and 800VDC battery packs by adopting a parallel connection or series connection mode for the two sub power supply systems, so that the application range of the battery packs with different voltage grade specifications is increased, and the use is convenient; in addition, by adding the bidirectional DCDC circuit on the battery pack, the energy storage cabinet with high voltage can be prevented from transferring energy to the energy storage cabinet with low voltage at the initial stage of parallel connection of the energy storage cabinets, the circulation phenomenon is prevented, and the normal and stable operation of the system is facilitated; and the energy storage system is changed into a three-phase energy storage system by adding a bidirectional ACDC circuit, so that the energy storage system can be applied to alternating current, and the application range is enlarged.
In order to make the aforementioned objects, features and advantages of the present application comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 illustrates a schematic circuit diagram of an energy storage system according to an embodiment of the present application;
FIG. 2 is a circuit diagram illustrating the connection between the energy storage system and the controller according to an embodiment of the present disclosure;
fig. 3 is a circuit diagram illustrating a connection between the energy storage system and the controller according to another embodiment of the present application;
FIG. 4 illustrates a schematic circuit diagram of a three-phase energy storage system according to an embodiment of the present application;
fig. 5 shows a connection circuit diagram of the bidirectional ACDC circuit and the controller according to the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.
In the prior art, the following problems may exist:
in the classification of the energy storage batteries, the specifications of two voltage levels of 400VDC and 800VDC are included, however, when a three-phase 380VAC energy storage system is obtained, the voltage range of the energy storage batteries must be between 680VDC and 1000VDC, so that only 800VDC battery packs can be used, for the battery packs with smaller voltage level specifications, a stacking mode is generally adopted, and a plurality of battery packs with smaller voltage level specifications are connected in series, so that the use is inconvenient; in addition, the lithium battery energy storage cabinet is a large-capacity battery system formed by directly stacking battery packs and then forms a battery energy storage cabinet, but the voltage of the battery energy storage cabinet is inconsistent due to different initial states of the batteries of the energy storage cabinets, and in the initial stage of parallel use of a plurality of energy storage cabinets, a cabinet with high voltage charges a cabinet with low voltage, namely, so-called circulation current, so that the normal work of the system is influenced.
Based on this, the embodiment of the application provides an energy storage system, a primary side circuit and a secondary side circuit of a transformer circuit in a bidirectional DCDC circuit are changed into two groups of windings corresponding to each other, and two groups of sub power supply systems, namely a first full-bridge sub circuit and a second full-bridge sub circuit, are arranged on the secondary side of the transformer circuit, and the two sub power supply systems are connected in parallel or in series, so that the energy storage system can be respectively suitable for 400VDC and 800VDC battery packs, the application range of the battery packs with different voltage grade specifications is increased, and the energy storage system is convenient to use; in addition, by adding the design of the bidirectional DCDC circuit on the battery pack, the energy storage cabinet with high voltage can be prevented from transferring energy to the energy storage cabinet with low voltage at the initial stage of parallel connection of the plurality of energy storage cabinets, the circulation phenomenon is prevented from being generated, and the normal and stable operation of the system is facilitated; and the energy storage system is changed into a three-phase energy storage system by adding a bidirectional ACDC circuit, so that the energy storage system can be applied to alternating current, and the application range is enlarged.
Referring to fig. 1, fig. 1 shows a schematic circuit diagram of an energy storage system according to an embodiment of the present application,
specifically, the energy storage system, including the energy storage battery, still includes: a bidirectional DCDC circuit; the bidirectional DCDC circuit comprises a first full-bridge circuit, a transformer circuit and a second full-bridge circuit; the second full-bridge circuit comprises at least one full-bridge sub-circuit;
the first full-bridge circuit is connected with the primary side of the transformer circuit, the secondary side of the transformer circuit is connected with the full-bridge sub-circuit, and the full-bridge sub-circuit is connected with the energy storage battery;
the second full-bridge circuit is used for being connected with the energy storage battery according to one or more full-bridge sub-circuits so as to adapt to the energy storage batteries with different voltages.
Specifically, when a plurality of full-bridge sub-circuits are used, the plurality of parallel or series full-bridge sub-circuits can respectively correspond to energy storage batteries with different input voltages when being connected with the transformer circuit.
In an embodiment of the present application, the second full-bridge circuit includes a first full-bridge sub-circuit and a second full-bridge sub-circuit; the transformer circuit comprises a first winding and a second winding on the primary side, and a third winding and a fourth winding on the secondary side; the first winding and the third winding correspond to each other and the number of the coils is equal; the second winding and the fourth winding correspond to each other and the number of the coils is equal.
In this embodiment, the third winding is connected to the first full-bridge sub-circuit, the fourth winding is connected to the second full-bridge sub-circuit, and the first full-bridge sub-circuit and the second full-bridge sub-circuit are connected to the energy storage battery respectively.
In some embodiments, the first winding, the second winding, the third winding and the fourth winding are equal in number of coils.
Specifically, first winding and third winding correspond, second winding and fourth winding correspond, through two sets of windings that correspond, can connect two sets of sub power supply systems at two-way DCDC circuit's secondary side, first full-bridge type sub circuit and second full-bridge type sub circuit promptly, different connected modes through two full-bridge type sub circuit, can select to connect 400V lithium cell group or 800V lithium cell group, output 800V voltage, the application of the battery package of different voltage class specifications has been increased, simultaneously, according to the 800VDC that this two-way DCDC circuit provided, the output that provides the condition for obtaining three-phase 380 VAC.
Referring to fig. 2, fig. 2 is a circuit diagram illustrating a connection between the energy storage system and the controller according to an embodiment of the present disclosure; in the figure, the MOS transistors Q13-Q16 form a first full-bridge circuit, the MOS transistors Q17-Q20 form a first full-bridge sub-circuit, the MOS transistors Q21-Q24 form a second full-bridge sub-circuit, and the capacitor C3, the capacitor C4, the capacitor C5 and the resonant inductor Lr form a voltage circuit.
When the controller receives a charging instruction, the energy storage system is controlled to enter a charging mode, the current sensor acquires a signal of resonant current and sends an IReson signal to the controller, the controller receives the signal and judges whether the signal crosses zero, when the IReson signal crosses zero, the wave form of the resonant current is positive, when the IReson signal does not cross zero, the wave form of the resonant current is negative, the controller controls the conduction of corresponding MOS (metal oxide semiconductor) tubes according to whether the IReson signal crosses zero, and the synchronous rectification of the secondary side of the bidirectional DCDC circuit is realized, namely, when the bidirectional DCDC circuit is in the charging mode, the MOS tubes Q13-Q16 work in an active pulse mode, the MOS tubes Q17-Q20 and the MOS tubes Q21-Q24 work in a synchronous rectification mode, and the controller detects the numerical values of a voltage signal Vbat and a current signal Ibat at the battery side, wherein the current signal Ibat is obtained by the controller through a detection resistor R5, the charging state of the battery can be detected through the voltage signal Vbat and the current signal Ibat, closed-loop control is implemented, and the logic control of the battery is maintained, and the constant-voltage control of the CC mode is maintained.
When the controller receives a discharge instruction, the energy storage system is controlled to enter a discharge mode, the current sensor collects signals of resonant current and sends an IReson signal to the controller, the controller controls the conduction of corresponding MOS (metal oxide semiconductor) tubes according to whether the IReson signal crosses zero, and the synchronous rectification of the primary side of the bidirectional DCDC circuit is realized, namely, when the bidirectional DCDC circuit is in the discharge mode, the MOS tubes Q17-Q20 and the MOS tubes Q21-Q24 work in an active pulse mode, the MOS tubes Q13-Q16 work in a synchronous rectification mode, and the controller detects output signals of the bidirectional DCDC circuit by reading the values of voltage signals Vh and current signals Idc of the primary side of the bidirectional DCDC circuit and executes closed-loop control.
Specifically, the controller realizes control of each MOS transistor through the PWM driving unit.
In the embodiment of the application, the energy storage battery adopts 400V lithium cell group, the full-bridge type sub-circuit is provided with two, two full-bridge type sub-circuits respectively with 400V lithium cell group parallel connection.
In the embodiment of the application, the two full-bridge sub-circuits are respectively a first full-bridge sub-circuit and a second full-bridge sub-circuit, and the first full-bridge sub-circuit and the second full-bridge sub-circuit are respectively connected with the 400V lithium battery pack in parallel.
In the above embodiment, a first full-bridge sub-circuit and a second full-bridge sub-circuit are connected in parallel and are connected in parallel with the 400V lithium battery pack, a first port of the first full-bridge sub-circuit is connected with an anode of the 400V lithium battery pack, a second port of the first full-bridge sub-circuit is connected with a cathode of the 400V lithium battery pack, a first port of the second full-bridge sub-circuit is connected with an anode of the 400V lithium battery pack, and a second port of the second full-bridge sub-circuit is connected with a cathode of the 400V lithium battery pack.
Referring to fig. 3, fig. 3 is a circuit diagram illustrating a connection between the energy storage system and the controller according to another embodiment of the present disclosure; in the embodiment of the application, the energy storage battery adopts 800V lithium battery pack, the full-bridge type sub-circuit is provided with two, two full-bridge type sub-circuits with 800V lithium battery pack is connected in series and constitutes the return circuit.
In the embodiment of the application, two full-bridge sub-circuits are first full-bridge sub-circuit and second full-bridge sub-circuit respectively, the first port of first full-bridge sub-circuit is connected the positive pole of 800V lithium cell group, the second port of first full-bridge sub-circuit is connected the first port of second full-bridge sub-circuit, the second port of second full-bridge sub-circuit is connected the negative pole of 800V lithium cell group.
In the above embodiment, the first full-bridge sub-circuit and the second full-bridge sub-circuit are connected in series, and two ports of the series circuit are respectively connected to the positive electrode and the negative electrode of the 800V lithium battery pack.
In some embodiments, voltage-dividing capacitors, which are respectively C6 and C7, are disposed on the battery side, and the two voltage-dividing capacitors may be capacitors with the same specification, and divide the voltage of the lithium battery pack equally, so that the voltages input to the first full-bridge sub-circuit and the second full-bridge sub-circuit by the lithium battery pack are the same.
In the embodiment of the application, the energy storage system further comprises a controller and a current sensor;
the current sensor is connected in series in a primary side circuit of the transformer circuit and is connected with the controller; the first full-bridge circuit, the first full-bridge sub-circuit, the second full-bridge sub-circuit and the second full-bridge circuit are respectively connected with the controller.
That is, in the embodiment of the present application, the first full-bridge sub-circuit and the second full-bridge sub-circuit are respectively connected to the controller.
The current sensor is used for detecting a resonance current signal of a primary side circuit of the transformer circuit and sending a detection result to the controller, so that the controller controls synchronous rectification of the first full-bridge circuit and the second full-bridge circuit, specifically, when receiving a charging instruction, the controller controls the first full-bridge circuit and the second full-bridge circuit to perform synchronous rectification, and when receiving a discharging instruction, the controller controls the first full-bridge circuit to perform synchronous rectification.
Specifically, the charging command and the discharging command may be manually issued and sent to the controller through the CAN communication module, or may be a charging time period set in advance in the controller.
Referring to fig. 4, fig. 4 shows a schematic circuit diagram of the three-phase energy storage system according to the embodiment of the present application; specifically, the three-phase energy storage system comprises a bidirectional ACDC circuit and the energy storage system; the bidirectional ACDC circuit adopts a three-level topology circuit; compared with a two-level topological circuit, the three-level topological circuit can reduce the switching ripple noise and reduce the volume of an EMI filter comprising the filter circuit.
In some embodiments, an ac side port of the bidirectional ACDC circuit is connected to a utility grid, and a dc side port of the bidirectional ACDC circuit is connected to a bidirectional DCDC circuit via a dc bus.
The bidirectional ACDC circuit comprises an AC side and a DC side; the direct current side of the bidirectional ACDC circuit is connected with the first full-bridge circuit, and the bidirectional ACDC circuit is connected with the controller;
in this application embodiment, two-way ACDC circuit is used for when the controller receives the instruction of discharging, will the direct current voltage of first full bridge circuit output converts alternating voltage to, and when the controller received the instruction of charging, will the alternating current voltage of the alternating current side of two-way ACDC circuit converts direct current voltage into.
In an embodiment of the application, the controller is configured to collect a voltage signal and a current signal at an ac side of the bidirectional ACDC circuit, collect a voltage signal and a current signal at a dc side of the bidirectional ACDC circuit, and control an output voltage or a power factor of the bidirectional ACDC circuit; specifically, the controller sends a first control signal to the bidirectional ACDC circuit according to the voltage signal and the current signal on the ac side and the voltage signal and the current signal on the dc side, so that when the controller receives a discharge instruction, the output voltage of the bidirectional ACDC circuit is controlled to reach a first preset value, and when the controller receives a charge instruction, the power factor value of the bidirectional ACDC circuit is controlled to reach a second preset value.
Specifically, referring to fig. 5, fig. 5 shows a circuit diagram of a connection between the bidirectional ACDC circuit and the controller according to the embodiment of the present application, in a charging state, the bidirectional ACDC circuit operates in a rectification mode, that is, an ac side of the bidirectional ACDC circuit transmits energy to a dc side, the controller collects voltage signals Va, vb, vc and current signals Ia, ib, ic on the ac side, and full voltage signals Vh and Idc on the dc side, the current signals Ia, ib, ic are obtained by the controller by detecting voltages on resistors R1, R2, and R3, respectively, and the current signal Idc is obtained by the controller by detecting a resistor R4, through the signals, the controller controls MOS transistors Q1 to Q12 in a three-level topology structure, so that a system power factor value reaches a second preset value, and an increase in the power factor reduces reactive power in the power grid, and reduces power loss in the power grid, therefore, the second preset value needs to be about 0.99, and approaches to a power factor 1, which is close to an optimal operating state, and in the embodiment, the second preset value may be 0.999 to 0.980; in a discharging state, the bidirectional ACDC circuit works in an inversion mode, namely, the direct current side of the bidirectional ACDC circuit transmits energy to the alternating current side, and the controller controls the alternating current voltage output by the bidirectional ACDC circuit through the collected voltage signal and current signal to enable the alternating current voltage to meet the preset requirement.
In the embodiment, the bidirectional DCDC circuit and the bidirectional ACDC circuit are added on the lithium battery pack, so that the alternating-current three-phase energy storage system can be provided, and meanwhile, when a plurality of energy storage systems are connected in parallel, ports on the alternating-current side of the bidirectional ACDC circuit are connected in parallel, and the circulation phenomenon cannot occur.
In the embodiment of the application, a voltage stabilizing unit is arranged on the direct current side of the bidirectional ACDC circuit; the voltage stabilizing unit comprises a first voltage stabilizing capacitor, a second voltage stabilizing capacitor and a bidirectional DCDC voltage regulating module;
the first port of first steady voltage electric capacity is connected the first port of the direct current side of two-way ACDC circuit, the second port of first steady voltage electric capacity is connected the first port of second steady voltage electric capacity, the second port of second steady voltage electric capacity is connected the second port of the direct current side of two-way ACDC circuit, the first port of two-way DCDC voltage regulating module is connected the first port of first steady voltage electric capacity, the second port of two-way DCDC voltage regulating module is connected the second port of first steady voltage electric capacity, the third port of two-way DCDC voltage regulating module is connected the first port of the alternating current side of two-way ACDC circuit, the fourth port of two-way DCDC voltage regulating module is connected the second port of second steady voltage electric capacity.
In the above embodiment, when the intermediate potential of +400V and-400V of the dc bus deviates, the voltages of the two energy storage capacitors are different, and the bidirectional DCDC voltage regulating module operates, so that the port with high voltage on the dc side of the bidirectional ACDC circuit transfers energy to the port with low voltage through the bidirectional DCDC voltage regulating module, thereby balancing the positive and negative potentials.
In the embodiment of the application, the three-phase energy storage system further comprises a filter circuit and a pre-charging circuit;
the filter circuit is connected with the pre-charging circuit, and the pre-charging circuit is connected with the alternating current side of the bidirectional ACDC circuit.
In some embodiments, the filter circuit may be a circuit of an EMI filter, the EMI filter is disposed at a power inlet of the ac side port of the bidirectional ACDC circuit, and since the power line is a main path for interference to and from the device, interference from the power grid may be transmitted to the device through the power line, which interferes with normal operation of the device, and similarly, interference generated by the device may be transmitted to the power grid through the power line, which interferes with normal operation of other devices.
In some embodiments, the pre-charging circuit is arranged, so that the pre-charging of the circuit can be performed, the phenomenon of fire striking when a signal is accessed to a port is prevented, and the impact on a line during power-on is reduced.
In the embodiment of the application, each phase of the alternating current side of the bidirectional ACDC circuit is provided with a boost circuit, each of the three boost circuits comprises a boost inductor La, lb, and Lc, when the circuit is in a charging state, an alternating current signal enters from an alternating current side port of the bidirectional ACDC circuit, the boost inductors La, lb, and Lc convert the inductors into magnetic energy and store the magnetic energy first to form a voltage source, and the voltage source and an input voltage are superposed and filtered and then provided to a load, so that the output voltage of the alternating current side of the bidirectional ACDC circuit to the direct current side is greater than the input voltage, a boosting process is completed, and 380VAC input by the alternating current side can be converted into 800VDC on the direct current side.
In some embodiments, the three-phase energy storage system further includes an auxiliary power supply, an input terminal of the auxiliary power supply is connected to any one of the ac sides of the bidirectional ACDC circuit, and an output terminal of the auxiliary power supply is connected to the controller.
In some embodiments, the auxiliary power supply takes power from any one phase circuit of the bidirectional ACDC circuit, and outputs direct current to power the controller through an operation of converting alternating current into direct current.
The embodiment of the application further provides an energy storage cabinet, which comprises energy storage equipment and peripheral circuit equipment, wherein the three-phase energy storage system is adopted in a system in the energy storage equipment.
In some embodiments, a plurality of energy storage systems may be arranged on one side of the dc bus, and the plurality of energy storage systems are connected in parallel, each energy storage system represents a small battery unit with an 800VDC interface, when an individual small battery unit fails, the system is slightly affected, and the system can be replaced and maintained in a hot-plug manner, the energy storage systems connected in parallel are connected to the dc bus, and the dc bus is connected to the bidirectional ACDC circuit to be converted into a three-phase 380VAC energy storage system.
In the embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.
It should be noted that the term "comprising" as used in the embodiments of the present application is intended to indicate the presence of the features as stated hereinafter, but does not exclude the addition of further features.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the application and is not intended to be limiting of the application.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the present disclosure, which should be construed in light of the above teachings. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (13)
1. An energy storage system, including an energy storage battery, characterized by still includes: a bidirectional DCDC circuit; the bidirectional DCDC circuit comprises a first full-bridge circuit, a transformer circuit and a second full-bridge circuit; the second full-bridge circuit comprises at least one full-bridge sub-circuit;
the first full-bridge circuit is connected with the primary side of the transformer circuit, and the secondary side of the transformer circuit is connected with the full-bridge sub-circuit;
the second full-bridge circuit is used for being connected with the energy storage battery according to one or more full-bridge sub-circuits so as to adapt to the energy storage batteries with different voltages.
2. The energy storage system of claim 1, wherein the second full-bridge circuit comprises a first full-bridge sub-circuit and a second full-bridge sub-circuit; the transformer circuit comprises a first winding and a second winding on a primary side, and a third winding and a fourth winding on a secondary side; the first winding and the third winding correspond to each other and the number of the coils is equal; the second winding and the fourth winding correspond to each other and the number of the coils is equal.
3. The energy storage system of claim 2, wherein the third winding is connected to the first full-bridge sub-circuit, the fourth winding is connected to the second full-bridge sub-circuit, and the first full-bridge sub-circuit and the second full-bridge sub-circuit are respectively connected to the energy storage battery.
4. The energy storage system of claim 2, wherein the first, second, third and fourth windings have an equal number of coils.
5. The energy storage system of claim 1, wherein the energy storage battery adopts a 400V lithium battery pack, the number of the full-bridge sub-circuits is two, and the two full-bridge sub-circuits are respectively connected with the 400V lithium battery pack in parallel.
6. The energy storage system of claim 1, wherein the energy storage battery is an 800V lithium battery pack, the number of the full-bridge sub-circuits is two, and the two full-bridge sub-circuits are connected in series with the 800V lithium battery pack to form a loop.
7. The energy storage system of claim 1, further comprising a controller and a current sensor;
the current sensor is connected in series in a primary side circuit of the transformer circuit and is connected with the controller; the first full-bridge circuit and the second full-bridge circuit are respectively connected with the controller;
the current sensor is used for detecting a resonant current signal of a primary side circuit of the transformer circuit and sending a detection result to the controller, so that the controller controls synchronous rectification of the first full-bridge circuit or the second full-bridge circuit.
8. A three-phase energy storage system comprising a bidirectional ACDC circuit, and the energy storage system of claim 7; the bidirectional ACDC circuit adopts a three-level topology circuit;
the bidirectional ACDC circuit comprises an AC side and a DC side; the direct current side of the bidirectional ACDC circuit is connected with the first full-bridge circuit, and the bidirectional ACDC circuit is connected with the controller;
the controller is used for collecting voltage signals and current signals of an alternating current side and a direct current side of the bidirectional ACDC circuit and controlling output voltage or power factor of the bidirectional ACDC circuit.
9. The three-phase energy storage system of claim 8, wherein a voltage stabilizing unit is disposed on a dc side of the bidirectional ACDC circuit; the voltage stabilizing unit comprises a first voltage stabilizing capacitor, a second voltage stabilizing capacitor and a bidirectional DCDC voltage regulating module;
the first port of first steady voltage electric capacity is connected the first port of the direct current side of two-way ACDC circuit, the second port of first steady voltage electric capacity is connected the first port of second steady voltage electric capacity, the second port of second steady voltage electric capacity is connected the second port of the direct current side of two-way ACDC circuit, the first port of two-way DCDC voltage regulating module is connected the first port of first steady voltage electric capacity, the second port of two-way DCDC voltage regulating module is connected the second port of first steady voltage electric capacity, the third port of two-way DCDC voltage regulating module is connected the first port of the alternating current side of two-way ACDC circuit, the fourth port of two-way DCDC voltage regulating module is connected the second port of second steady voltage electric capacity.
10. The three-phase energy storage system of claim 8, further comprising a filter circuit and a pre-charge circuit;
the filter circuit is connected with the pre-charging circuit, and the pre-charging circuit is connected with the alternating current side of the bidirectional ACDC circuit.
11. A three-phase energy storage system according to claim 8, wherein a boost voltage boost circuit is provided for each phase on the ac side of the bidirectional ACDC circuit.
12. The three-phase energy storage system of claim 8, further comprising an auxiliary power source, wherein an input of the auxiliary power source is connected to any one of the ac sides of the bidirectional ACDC circuit, and an output of the auxiliary power source is connected to the controller.
13. An energy storage cabinet which characterized in that: comprising an energy storage device and a peripheral circuit device, the system in the energy storage device employing a three-phase energy storage system as claimed in any of claims 8-12.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211583642.XA CN115800461A (en) | 2022-12-09 | 2022-12-09 | Energy storage system, three-phase energy storage system and energy storage cabinet |
| PCT/CN2023/104259 WO2024119794A1 (en) | 2022-12-09 | 2023-06-29 | Energy storage system, three-phase energy storage system and energy storage cabinet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211583642.XA CN115800461A (en) | 2022-12-09 | 2022-12-09 | Energy storage system, three-phase energy storage system and energy storage cabinet |
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| CN115800461A true CN115800461A (en) | 2023-03-14 |
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| CN202211583642.XA Pending CN115800461A (en) | 2022-12-09 | 2022-12-09 | Energy storage system, three-phase energy storage system and energy storage cabinet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024119794A1 (en) * | 2022-12-09 | 2024-06-13 | 上海派能能源科技股份有限公司 | Energy storage system, three-phase energy storage system and energy storage cabinet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI397250B (en) * | 2009-04-28 | 2013-05-21 | Univ Southern Taiwan | Two way full bridge zero-voltage and zero-current switching dc-dc converter |
| CN108809138A (en) * | 2018-06-29 | 2018-11-13 | 西安特锐德智能充电科技有限公司 | A kind of two-way ACDC circuits and its control method of compatible three-phase and single phase alternating current power supply |
| TWI745729B (en) * | 2019-08-02 | 2021-11-11 | 海韻電子工業股份有限公司 | Full-bridge resonant conversion circuit |
| CN212073740U (en) * | 2019-10-22 | 2020-12-04 | 芜湖瑞来电子科技有限公司 | Charging and discharging control system for energy storage of electric automobile |
| CN115800461A (en) * | 2022-12-09 | 2023-03-14 | 上海派能能源科技股份有限公司 | Energy storage system, three-phase energy storage system and energy storage cabinet |
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- 2022-12-09 CN CN202211583642.XA patent/CN115800461A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024119794A1 (en) * | 2022-12-09 | 2024-06-13 | 上海派能能源科技股份有限公司 | Energy storage system, three-phase energy storage system and energy storage cabinet |
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