CN218102599U - Three-phase battery energy storage system of V-arrangement cascade structure - Google Patents
Three-phase battery energy storage system of V-arrangement cascade structure Download PDFInfo
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- CN218102599U CN218102599U CN202221257752.2U CN202221257752U CN218102599U CN 218102599 U CN218102599 U CN 218102599U CN 202221257752 U CN202221257752 U CN 202221257752U CN 218102599 U CN218102599 U CN 218102599U
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Abstract
The utility model provides a three-phase battery energy storage system of V-arrangement cascade structure, include: the two energy storage bridge arms are connected in a V shape to form three phases; each energy storage bridge arm comprises N energy storage units; each energy storage unit comprises: the single-phase H-bridge converter realizes AC/DC bidirectional conversion of electric energy, and one side of the single-phase H-bridge converter is a direct current side, and the other side of the single-phase H-bridge converter is an alternating current side; a pre-charge circuit connected to a DC side of the single-phase H-bridge converter; a battery cell connected with the pre-charge circuit. The utility model adopts two energy storage bridge arms to realize a three-phase and three-wire battery energy storage system; the two energy storage bridge arms are completely independent in control and simple in control; and the number of the required sub-modules is equivalent to that of three-phase star connection when the same grid-connected voltage is realized.
Description
Technical Field
The utility model belongs to battery energy storage field relates to a cascade battery energy storage system, specifically is an adopt the modularization energy storage system of the cascade structure that the V-arrangement type is connected for medium voltage battery energy storage occasion.
Background
With the development of smart grids and new energy sources, battery energy storage systems are getting more and more widely used.
The battery energy storage system has various topological forms, the grid-connected voltage of the two-level battery energy storage system is mainly 380V, the two-level battery energy storage system is suitable for the application of a low-voltage power distribution network, and the single-machine capacity does not exceed 1MW; the grid-connected voltage of the three-level battery energy storage system reaches 690-1140V, and the single-machine capacity can reach 3MW; the grid-connected voltage of the cascade battery energy storage system reaches 10-35kV, and the single-machine capacity can reach 10-40MW. The cascade battery energy storage system can realize medium-voltage grid connection and single machine high capacity, and has good application prospects in the aspects of new energy grid connection, power grid auxiliary service and the like.
The cascade battery energy storage system is composed of three phases and has two electrical connection methods of star connection and triangle connection. Under the same grid-connected voltage, the number of the submodules required by the delta-connected battery energy storage system is 1.732 times that of the star-connected battery energy storage system, so the cost is higher. To minimize the number of sub-modules required for the energy storage system, all engineering applications are in the form of star connections. The current engineering application is mainly 10kV grid connection.
At present, the battery energy storage systems basically operate in a three-phase three-line grid-connected mode, and the star-connected cascade battery energy storage system performs coordination control on three phases, but the actual control degree of freedom is 2. This increases the complexity of the modulation, equalization control of the control system.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model aims at providing a three-phase battery energy storage system of V-arrangement cascade structure.
According to the utility model discloses an aspect provides a three-phase battery energy storage system of V-arrangement cascade structure, include:
the two energy storage bridge arms are connected in a V shape to form three phases;
each energy storage bridge arm comprises N energy storage units;
each energy storage unit comprises:
the single-phase H-bridge converter realizes AC/DC bidirectional conversion of electric energy, and one side of the single-phase H-bridge converter is a direct current side and the other side of the single-phase H-bridge converter is an alternating current side;
a pre-charge circuit connected to a DC side of the single-phase H-bridge converter;
a battery cell connected with the pre-charge circuit.
Preferably, in each energy storage unit, the output end of the battery unit is connected with the input end of the pre-charging circuit to transmit a direct-current voltage, and the output end of the pre-charging circuit is connected with the direct-current side of the single-phase H-bridge converter respectively to transmit a direct-current voltage.
Preferably, the ac sides of the N single-phase H-bridge converters are connected in series to form one said tank bridge arm.
Preferably, three connection inductors La, lb and Lc are further included, and their respective two end points are denoted as La (1), la (2), lb (1), lb (2), lc (1) and Lc (2);
three end points La (2), lb (2) and Lc (2) of the three connecting inductors are connected together to form star connection;
the two energy storage bridge arms are respectively an energy storage bridge arm X and an energy storage bridge arm Y;
one end of the energy storage bridge arm X is connected with an end point La (1) of a connecting inductor La, and the other end of the energy storage bridge arm X is connected with a power grid A;
one end of the energy storage bridge arm Y is connected with an end point Lb (1) of the connecting inductor Lb, and one end of the energy storage bridge arm Y is connected with the power grid B. The terminal Lc (1) of the connecting inductor Lc is connected to the network C.
Preferably, the battery unit is composed of rechargeable batteries connected in series or in parallel.
Preferably, the pre-charge circuit comprises 1 resistor and 1 contactor connected in parallel.
Preferably, the single-phase H-bridge converter comprises 4 power electronic switching devices and a dc capacitor, the 4 power electronic switching devices are connected in a single-phase H-bridge structure, and the dc capacitor is connected in parallel at the dc side.
Preferably, the connection inductor is an iron core inductor or an air core inductor.
Preferably, the two tank bridge arms are independent of each other.
Preferably, each energy storage leg comprises 20 energy storage cells.
Compared with the prior art, the utility model discloses following beneficial effect has:
the embodiment of the utility model provides a three-phase battery energy storage system of V-arrangement cascade structure adopts two energy storage bridge arms and a phase inductance, has realized three-way battery energy storage system of three-phase; the two energy storage bridge arms are completely independent in control and simple in control; under the same grid-connected voltage, the number of the energy storage units of a single bridge arm is equal to that of the three-phase star-shaped energy storage units, and the cost problem in the prior art is solved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a block diagram of an overall modular medium voltage energy storage system in an embodiment of the invention;
fig. 2 is a schematic diagram of an energy storage unit according to an embodiment of the present invention;
fig. 3 is a structural diagram of an energy storage unit according to another embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that numerous variations and modifications could be made by those skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
The utility model provides an embodiment, a three-phase battery energy storage system of V-arrangement cascade structure, including two energy storage bridge arms, two energy storage bridge arms adopt the V-arrangement to connect and constitute three-phase; each energy storage bridge arm comprises N energy storage units;
each energy storage unit comprises a single-phase H-bridge converter, a pre-charging circuit and a battery unit, the single-phase H-bridge converter realizes AC/DC bidirectional conversion of electric energy, one side of the single-phase H-bridge converter is a direct current side, and the other side of the single-phase H-bridge converter is an alternating current side; the pre-charging circuit is connected with the direct current side of the single-phase H-bridge converter; the battery unit is connected with the pre-charging circuit. Fig. 2 is a schematic structural diagram of the energy storage unit in this embodiment.
As shown in fig. 1, the present invention provides a structure diagram of the whole modular medium voltage energy storage system according to the preferred embodiment.
In the embodiment, the system comprises 2N battery units, 2N pre-charging circuits, 2N single-phase H-bridge converters and 3 connecting inductors. The energy storage unit comprises a battery unit, a pre-charging circuit and single-phase H-bridge converters, wherein the output end of the battery unit is connected with the input end of the pre-charging circuit to transmit direct-current voltage, the output end of the pre-charging circuit is connected with the direct-current ends of 2N single-phase H-bridge converters to transmit direct-current voltage, and 2N energy storage units X1, X2 \8230, 8230, XN, Y1, Y2 \8230, 8230and YN which are identical in structure are formed.
N energy storage units X1, X2 \8230and \8230, wherein an X N alternating current side is connected in series to form an energy storage bridge arm X; n energy storage units Y1, Y2 \8230, 8230and YN AC sides are connected in series to form an energy storage bridge arm Y.
Two end points of the connection inductor La, the connection inductor Lb, and the connection inductor Lc are denoted as La (1), la (2), lb (1), lb (2), lc (1), and Lc (2), respectively. Three terminals La (2), lb (2) and Lc (2) of the three connecting inductors are connected together to form a star connection. One end of an energy storage bridge arm X is connected with an end point La (1) of a connecting inductor La, and the other end of the energy storage bridge arm X is connected with a power grid A; one end of the energy storage bridge arm Y is connected with an end point Lb (1) of the connection inductor Lb, and one end of the energy storage bridge arm Y is connected with the power grid B. The terminal Lc (1) of the connecting inductor Lc is connected to the network C. The three grids a, B, C are usaa, usb, and Usc as described in fig. 1.
In other embodiments of the present invention, the battery unit is composed of a plurality of smaller rechargeable battery cells, and the rechargeable battery cells are connected in series or in parallel.
In other embodiments of the present invention, the precharge circuit includes: 1 resistance and 1 contactor, wherein: the resistor is connected with the contactor in parallel.
In other embodiments of the utility model, single-phase H bridge converter includes 4 power electronic switching devices and direct current electric capacity, and 4 switching devices connect to single-phase H bridge structure, and direct current electric capacity connects in parallel in the direct current side.
In other embodiments of the present invention, the connection inductor may be either a core inductor or an air core inductor.
The present invention provides another preferred embodiment. The embodiment is a 5MW battery energy storage system with the rated voltage of 10kV.
As shown in fig. 3, the energy storage unit of the present embodiment includes: 1 storage battery, 1 resistance, 1 contactor, 4 IGBTs and 1 group electric capacity. A. And the bridge arms formed by 20 energy storage modules of the B-phase bridge arm and the C-phase inductor are connected according to the mode shown in the figure 2 to form the whole energy storage system.
Wherein:
nominal voltage 716.8V for 1 pack and nominal capacity 280Ah.
The pre-charging circuit consists of 1 resistor R1 and 1 contactor K1. Wherein: r1 and K1 are connected in parallel. One end of the resistor R1 and one end of the contactor K1 are connected to the anode of the storage battery pack and are input ends of the pre-charging circuit; the other ends of the resistor R1 and the contactor K1 are output ends of the pre-charging circuit. The resistance of R1 is 200 ohms, the rated voltage of K1 is 1200VDC, and the rated current is 250A.
The single-phase H-bridge converter consists of 1 group of capacitors C1 and IGBT devices V1, V2, V3 and V4. Wherein: v1 and V2 are connected in series to form a branch circuit, V3 and V4 are connected in series to form a branch circuit, and the two branch circuits are connected with the capacitor bank C1 in parallel. The capacitor bank C1 is rated at 1200VDC and has a capacity of 6000uF. The IGBT devices V1, V2, V3 and V4 have a rated voltage of 1700V and a rated current of 600A.
The three phases of the energy storage systems A, B and C are connected with a connecting inductor La, a connecting inductor Lb and a connecting inductor Lc of a power grid at a rated current of 400A, and the inductance is 5mH.
The foregoing descriptions have been directed to embodiments of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. A three-phase battery energy storage system of a V-shaped cascade structure, comprising:
the two energy storage bridge arms are connected in a V shape to form three phases;
each energy storage bridge arm comprises N energy storage units;
each energy storage unit comprises:
the single-phase H-bridge converter realizes AC/DC bidirectional conversion of electric energy, and one side of the single-phase H-bridge converter is a direct current side, and the other side of the single-phase H-bridge converter is an alternating current side;
a pre-charge circuit connected to a DC side of the single-phase H-bridge converter;
a battery cell connected with the pre-charge circuit.
2. The three-phase battery energy storage system in a V-shaped cascade structure as claimed in claim 1, wherein in each energy storage unit, the output end of the battery unit is connected with the input end of the pre-charging circuit to transmit direct-current voltage, and the output ends of the pre-charging circuit are respectively connected with the direct-current side of the single-phase H-bridge converter to transmit direct-current voltage.
3. The three-phase battery energy storage system with the V-shaped cascade structure according to claim 1, wherein the AC sides of N single-phase H-bridge converters are connected in series to form one energy storage bridge arm.
4. The three-phase battery energy storage system with the V-shaped cascade structure is characterized by further comprising three connecting inductors, a power grid A, a power grid B and a power grid C; the three connecting inductors are respectively a connecting inductor La, a connecting inductor Lb and a connecting inductor Lc; two respective end points of the three connection inductors La, lb and Lc are respectively marked as La1, la2, lb1, lb2, lc1 and Lc2;
three end points La2, lb2 and Lc2 of the three connecting inductors are connected together to form star connection;
the two energy storage bridge arms are respectively an energy storage bridge arm X and an energy storage bridge arm Y;
one end of the energy storage bridge arm X is connected with an end point La1 of a connecting inductor La, and the other end of the energy storage bridge arm X is connected with the power grid A;
one end of the energy storage bridge arm Y is connected with an end point Lb1 of a connecting inductor Lb, and one end of the energy storage bridge arm Y is connected with the power grid B;
and the end point Lc1 of the connecting inductor Lc is connected with the power grid C.
5. The three-phase battery energy storage system of claim 1,
the battery unit is formed by connecting rechargeable batteries in series or in series and parallel.
6. The three-phase battery energy storage system in a V-shaped cascade structure as claimed in claim 1, wherein the pre-charging circuit comprises 1 resistor and 1 contactor which are connected in parallel.
7. The three-phase battery energy storage system of claim 1, wherein the single-phase H-bridge converter comprises 4 power electronic switching devices and a DC capacitor, the 4 power electronic switching devices are connected in a single-phase H-bridge structure, and the DC capacitor is connected in parallel on the DC side.
8. The three-phase battery energy storage system with the V-shaped cascade structure according to claim 4, wherein the connecting inductors La, lb and Lc are iron core inductors or air core inductors.
9. The three-phase battery energy storage system in the V-shaped cascade structure according to any one of claims 1 to 8, wherein the two energy storage bridge arms are independent of each other.
10. The three-phase battery energy storage system in the V-shaped cascade structure according to any one of claims 1 to 8, wherein each energy storage bridge arm comprises 20 energy storage units.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221257752.2U CN218102599U (en) | 2022-05-24 | 2022-05-24 | Three-phase battery energy storage system of V-arrangement cascade structure |
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| CN202221257752.2U CN218102599U (en) | 2022-05-24 | 2022-05-24 | Three-phase battery energy storage system of V-arrangement cascade structure |
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