CN217427743U - Multiphase annular battery energy storage system - Google Patents
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- CN217427743U CN217427743U CN202221273023.6U CN202221273023U CN217427743U CN 217427743 U CN217427743 U CN 217427743U CN 202221273023 U CN202221273023 U CN 202221273023U CN 217427743 U CN217427743 U CN 217427743U
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Abstract
The utility model provides a multiphase annular battery energy storage system, which comprises 1-M energy storage devices, wherein M is a natural number more than or equal to 3; 1-M energy storage devices are connected end to form a multiphase annular battery energy storage system; wherein: the second end of the 1 st energy storage device is connected with the first end of the 2 nd energy storage device, and the common end is connected with the first phase of the multi-phase alternating current output; the second end of the 2 nd energy storage device is connected with the first end of the 3 rd energy storage device, and the common end is connected to the second phase of the multi-phase alternating current output; and the second end of the Mth energy storage device is connected with the first end of the 1 st energy storage device, and the common end is connected with the Mth phase of the multi-phase alternating current output. The energy storage system has the characteristics of simple structure, strong expandability and high modularization degree.
Description
Technical Field
The utility model relates to a battery energy storage system technical field specifically relates to a heterogeneous annular battery energy storage system.
Background
In recent years, battery energy storage technology has been rapidly developed and applied. The battery energy storage technology has various routes, such as a voltage grid-connected two-level battery energy storage system, a medium-voltage grid-connected three-level battery energy storage system and a modular battery energy storage system which can realize grid connection from low voltage to high voltage. The modular battery energy storage system avoids direct large-scale series connection of a power switch device and an energy storage battery, has strong expandability, good output electric energy quality and easy maintenance of modularization, and is one of the most promising forms for realizing the energy storage of a large-capacity battery.
However, the conventional battery energy storage system can only output three-phase voltage and cannot output any phase voltage, so that the power supply requirement under some special scenes cannot be met.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model aims at providing a heterogeneous annular battery energy storage system to solve traditional battery energy storage system and can only three-phase voltage output's limitation.
In order to achieve the above object, the present invention provides a multiphase ring-shaped battery energy storage system, which comprises 1-M energy storage devices, wherein M is a natural number greater than or equal to 3; the 1-M energy storage devices are connected end to form a multiphase annular battery energy storage system; wherein: the second end of the 1 st energy storage device is connected with the first end of the 2 nd energy storage device, and the common end is connected with the first phase of the multi-phase alternating current output; the second end of the 2 nd energy storage device is connected with the first end of the 3 rd energy storage device, and the common end is connected to the second phase of the multi-phase alternating current output; the second end of the Mth energy storage device is connected with the first end of the 1 st energy storage device, and the common end is connected with the last phase of the multi-phase alternating current output. And the first end of one energy storage device is connected to the second end of the other energy storage device in the two adjacent energy storage devices in the annular shape.
Optionally, each of the energy storage devices comprises a plurality of energy storage units connected in series.
Optionally, the energy storage unit includes an energy storage device, an inverter, a first inductor and a second inductor, the energy storage device includes a positive electrode and a negative electrode, the inverter includes a dc positive electrode input terminal, a dc negative electrode input terminal, a first ac output terminal and a second ac output terminal, where: the positive pole of energy storage device is connected the positive input terminal of direct current of dc-to-ac converter, the negative pole of energy storage device is connected the direct current negative pole input terminal of dc-to-ac converter, the first alternating current output end of dc-to-ac converter is connected the one end of first inductance, the second alternating current output end of dc-to-ac converter is connected the one end of second inductance, the other end of first inductance is as the first end of energy storage unit, the other end of second inductance is as the second end of energy storage unit.
Optionally, the energy storage device is a battery.
Optionally, the number of the energy storage units included in each of the 1 to M energy storage devices is equal.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses foretell heterogeneous ring battery energy storage system, the phase place of every energy storage unit's output alternating voltage fundamental wave all compares adjacent other energy storage units and differs fixed angle to satisfy the product that above-mentioned angle and system contained energy storage unit quantity be 2 pi, because the energy storage unit quantity that every energy memory contained is the same, consequently every energy memory's output alternating voltage fundamental wave's phase place all compares adjacent other energy memory and differs fixed angle, consequently energy storage system can export heterogeneous interchange output. If the number of output phases of the system is to be adjusted without changing the system capacity and the system output voltage, the number of energy storage devices included in the system is adjusted. Therefore, the energy storage system has the characteristics of simple structure, strong expandability and high modularization degree.
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 schematic structural view of a multiphase ring-shaped battery energy storage system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an energy storage device according to an embodiment of the present invention;
fig. 3 is a schematic view of an energy storage unit according to an embodiment of the present invention;
fig. 4 is a schematic 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 various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
Referring to fig. 1, a multi-phase ring-shaped battery energy storage system includes 1-M energy storage devices, as shown in fig. 1, including a 1 st energy storage device 10, a 2 nd energy storage device 20 … … and an M-th energy storage device M0, specifically, the energy storage devices are connected in a ring, that is,
the second end of the 1 st energy storage device 10 is connected to the first end of the 2 nd energy storage device 20 and the common end is connected to the first phase of the multiphase ac output, the second end of the 2 nd energy storage device 20 is connected to the first end of the 3 rd energy storage device 30 and the common end is connected to the second phase of the multiphase ac output, … …, and so on, the second end of the mth energy storage device M0 is connected to the first end of the 1 st energy storage device 10 and the common end is connected to the last phase of the multiphase ac output. It should be noted that the first end and the second end of the energy storage are not arbitrary, the first end is the positive pole of the output of the energy storage device, and the second end is the negative pole of the output of the energy storage device. The first end of one energy storage device must be connected to the second end of another energy storage device. The energy storage system has the advantages of being simple in structure, strong in expandability and high in modularization degree.
Referring to fig. 2, in one embodiment, each energy storage device includes a plurality of energy storage units connected in series. Specifically, the 1 st energy storage device, the 2 nd energy storage device … … mth energy storage device each include a plurality of battery energy storage units connected in series.
It should be noted that in one embodiment, each energy storage device includes an equal number of energy storage cells. The phase of the output alternating voltage fundamental wave of the energy storage device is different from that of other adjacent energy storage devices by a fixed angle, so that the whole energy storage system can output multiphase alternating current output.
Specifically, the energy storage unit includes an energy storage device B1, an inverter CV1, a first inductor L1, and a second inductor L2. A first end of the energy storage device B1 is connected to a first end of the inverter CV1, a second end of the energy storage device B1 is connected to a second end of the inverter CV1, a third end of the inverter CV1 is connected to a first end of a first inductor L1, a fourth end of the inverter CV1 is connected to a first end of a second inductor L2, a second end of the first inductor L1 serves as a first end of an energy storage unit, and a second end of the second inductor L2 serves as a second end of the energy storage unit; specifically, a dc positive input of inverter CV1 serves as a first terminal of inverter CV1, a dc negative input of inverter CV1 serves as a second terminal of inverter CV1, an ac output first terminal of inverter CV1 serves as a third terminal of inverter CV1, and an ac output second terminal of inverter CV1 serves as a fourth terminal of inverter CV 1. The anode of the energy storage device B1 is used as the first end of the energy storage device, and the cathode of the energy storage device B1 is used as the second end of the energy storage device.
In this embodiment, through the arrangement of the first inductor L1 and the second inductor L2, the current harmonic on the ac side can be further filtered out, and the operational reliability of the energy storage circuit is ensured. In a more detailed embodiment, the first inductor L1 and the second inductor L2 may employ an inductor of 0.25 mH.
It is to be understood that the specific type of energy storage device B1 is not exclusive and in one embodiment, energy storage device B1 is a battery. Further, a lithium titanate battery may be employed as the energy storage device B1. In a more detailed embodiment, a high lithium titanate battery is used with a nominal voltage of 48V and a nominal capacity of 55 Ah.
The multi-phase ring-shaped battery energy storage system comprises M energy storage devices, each energy storage device comprises N energy storage units, wherein N is a positive natural number, the phase of the output alternating voltage fundamental wave of each energy storage unit is 2 x pi/(M x N) different from that of the other adjacent energy storage units, therefore, the phase of the output alternating voltage fundamental wave of each energy storage device is 2 x pi/M different from that of the other adjacent energy storage devices, and therefore the energy storage system can output M-phase alternating current output.
Further, assuming that the effective value of the output voltage to be realized is U, the effective value of the fundamental wave of the output ac voltage of each energy storage unit should be set to 2 × pi U/(M × N). If the number of output phases of the system is to be adjusted without changing the system capacity and the system output voltage U, the number M of the energy storage devices included in the system may be adjusted. Therefore, the energy storage system has the characteristics of simple structure, strong expandability and high modularization degree.
In the above embodiments, the particular type of inverter CV1 is not exclusive, and inverter CV1 may be any single-phase four-port inverter, including but not limited to a two-level H-bridge inverter, a three-level I-inverter, and a three-level T-inverter.
Referring to fig. 3, in an embodiment, the inverter CV1 adopts a two-level H-bridge structure, the inverter CV1 includes a first switching device T1, a second switching device T2, a first freewheeling diode D1, a second freewheeling diode D2 and a filter capacitor C1, a control terminal of the first switching device T1 and a control terminal of the second switching device T2 are respectively used for connecting an external control device, a first terminal of a switching device T1 is connected to a cathode of the first freewheeling diode D2 and a first terminal of the filter capacitor C1, a second terminal of the first switching device T1 is connected to an anode of the first freewheeling diode D1 and a first terminal of the second switching device T2, a cathode of the second freewheeling diode D2 is connected to a first terminal of the second switching device T2, and a second terminal of the second switching device T2 is connected to an anode of the second freewheeling diode D2 and a second terminal of the filter capacitor C1. A first terminal of the first switching device T1 serves as a first terminal of the inverter CV1, a second terminal of the second switching device T2 serves as a second terminal and a fourth terminal of the inverter CV1, and a second terminal of the first switching device T1 serves as a third terminal of the inverter CV 1.
It is understood that the specific types of the first and second switching devices T1 and T2 are not exclusive, as long as the output can be modulated according to a signal from an external control device. For example, in one embodiment, the first switching device T1 and the second switching device T2 are both mosfets.
Specifically, Metal-Oxide-Semiconductor Field Effect transistors (MOSFETs) may be classified into an N-channel type in which electrons are dominant and a P-channel type in which holes are dominant according to their channel polarities, and are generally called N-type Metal-Oxide-Semiconductor Field Effect transistors (NMOSFETs) and P-type Metal-Oxide-Semiconductor Field Effect transistors (PMOSFETs), and what type of MOSFET is specifically used may be selected by a user in various ways according to a specific scenario.
In one embodiment, to ensure that the tank circuit can be used in a higher voltage environment, the voltage resistance of the selected MOSFET should be 100V-150V. Further, in a more detailed embodiment, a power MOSFET of type SFG180N10PF is selected as the switching device of the energy storage unit, which allows a continuous drain current of 180A to pass and a pulsed drain current of 540A to be sustained.
Specifically, in order to ensure the voltage stabilizing effect, in a more detailed embodiment, the filter capacitor C1 may be set to be 6800 uF.
With continued reference to fig. 4, in another embodiment, the inverter CV1 has a three-level T-type structure, the inverter CV1 includes a first switching device T1, a second switching device T2, a third switching device T3, a fourth switching device T4, a first freewheeling diode D1, a second freewheeling diode D2, a third freewheeling diode D3, a fourth freewheeling diode D4, a filter capacitor C1 and a filter capacitor C2, control terminals of the first switching device T1, the second switching device T2, the third switching device T3 and the fourth switching device T4 are respectively connected to an external control device, a first terminal of the switching device T1 is connected to a cathode of the first freewheeling diode D2 and a first terminal of the filter capacitor C1, a second terminal of the first switching device T1 is connected to an anode of the first freewheeling diode D1, a first terminal of the second switching device T2 and an anode of the third freewheeling diode D3, a cathode of the second terminal of the second switching device T2 is connected to the second freewheeling diode D87472, a second terminal of the second switching device T2 is connected to an anode of the second freewheeling diode D2 and a second terminal of the filter capacitor C2, a second terminal of the third switching device T3 is connected to an anode of the third freewheeling diode D3, a third terminal of the third switching device T3 is connected to a cathode of the third freewheeling diode D3 and a cathode of the fourth freewheeling diode D4, a first terminal of the fourth switching device T4 is connected to a cathode of the fourth freewheeling diode D4, and a second terminal of the fourth switching device T4 is connected to an anode of the fourth freewheeling diode D4, a second terminal of the first filter capacitor C1 and a first terminal of the second filter capacitor C2. A first terminal of the first switching device T1 serves as a first terminal of the inverter CV1, a second terminal of the second switching device T2 serves as a second terminal of the inverter CV1, a second terminal of the first switching device T1 serves as a third terminal of the inverter CV1, and a second terminal of the fourth switching device T4 serves as a fourth terminal of the inverter CV 1.
It is understood that the specific types of the first switching device T1, the second switching device T2, the third switching device T3 and the fourth switching device T4 are not exclusive as long as the output can be modulated according to a signal from an external control apparatus. For example, in one embodiment, the first switching device T1, the second switching device T2, the third switching device T3, and the fourth switching device T4 are mosfets.
In one embodiment, to ensure that the tank circuit can be used in a higher voltage environment, the voltage resistance of the selected MOSFET should be 100V-150V. Further, in a more detailed embodiment, a power MOSFET of type SFG180N10PF is selected as the switching device of the energy storage unit, which allows a continuous drain current of 180A to pass and a pulsed drain current of 540A to be sustained.
Specifically, in order to ensure the voltage stabilizing effect, in a more detailed embodiment, the filter capacitor C1 and the filter capacitor C2 may be set to be 6800 uF.
To facilitate an understanding of the various embodiments of the present application, the present application is explained below with reference to specific embodiments. The battery energy storage system of the embodiment is applied to a 60kW/380V six-phase alternating current output battery energy storage system. The annular energy storage system of the embodiment comprises 6 energy storage devices connected end to end, and the whole energy storage system is formed in the mode of fig. 1. Each energy storage device of the present embodiment includes 20 energy storage units connected in series, and the energy storage device is configured in the manner of fig. 2. The energy storage unit of this embodiment includes: the energy storage unit is formed by a first switching device T1 and a freewheeling diode D1 thereof, a second switching device T2 and a freewheeling diode D2, 1 filter capacitor C1, 1 energy storage battery, a first inductor L1 and a second inductor L2 thereof according to the mode of FIG. 3. Specifically, 2 switching devices T1, T2 and freewheeling diodes D1, D2 thereof, and 1 smoothing capacitor C1 constitute the inverter CV 1.
In this embodiment, the energy storage device U of the energy storage unit is a lithium titanate battery, and has a rated voltage of 48V and a nominal capacity of 55 Ah. Due to the limitation of cost and volume, the filter inductance selected in the embodiment is all 1 mH. The switching devices (namely the first switching device T1 and the second switching device T2) of the energy storage unit are MOSFETs, the withstand voltage is 100V-150V, and the MOSFETs with the model number of SFG180N10PF are selected as the switching devices of the energy storage unit, the allowable continuous drain current is 180A, and the sustainable pulse drain current is 540A. The 2 MOSFETs are connected in a half-bridge structure and connected with a filter capacitor C1 and a storage battery in parallel, and the capacity of the filter capacitor C1 is 6800 uF.
The multiphase ring-shaped battery energy storage system of the embodiment includes 6 energy storage devices, each energy storage device includes 20 energy storage units, and the phase of the output alternating voltage fundamental wave of each energy storage unit is pi × 60 different from that of the other adjacent energy storage units, so that the phase of the output alternating voltage fundamental wave of each energy storage device is pi × 3 different from that of the other adjacent energy storage devices, and therefore the energy storage system can output six-phase alternating current output. The effective value of the output voltage to be realized is 380V, and the effective value of the fundamental wave of the output alternating voltage of each energy storage unit is set to be 20V.
The utility model discloses energy storage system in the above-mentioned embodiment has simple structure, scalability is strong, characteristics that the modularization degree is high.
The foregoing description of the specific embodiments of the invention has been presented. 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. The above-described preferred features may be used in any combination without conflict with each other.
Claims (10)
1. A multiphase annular battery energy storage system is characterized by comprising 1-M energy storage devices, wherein M is a natural number more than or equal to 3; the 1-M energy storage devices are connected into a ring to form a multi-phase ring-shaped battery energy storage system; wherein:
the second end of the 1 st energy storage device is connected with the first end of the 2 nd energy storage device, and the common end is connected with the first phase of the multi-phase alternating current output;
the second end of the 2 nd energy storage device is connected with the first end of the 3 rd energy storage device, and the common end is connected to the second phase of the multi-phase alternating current output;
the second end of the Mth energy storage device is connected with the first end of the 1 st energy storage device, and the common end of the Mth energy storage device is connected with the Mth phase of the multi-phase alternating current output;
and the first end of one energy storage device is connected to the second end of the other energy storage device in the two adjacent energy storage devices in the annular shape.
2. The multiphase ring battery energy storage system of claim 1, wherein each energy storage device comprises a plurality of energy storage cells connected in series.
3. The multiphase ring battery energy storage system of claim 2, wherein the energy storage unit comprises an energy storage device, an inverter, a first inductor, and a second inductor, the inverter comprising a dc positive input, a dc negative input, a first ac output, and a second ac output, wherein: the positive pole of energy storage device is connected the positive input terminal of direct current of dc-to-ac converter, the negative pole of energy storage device is connected the direct current negative pole input terminal of dc-to-ac converter, the first alternating current output end of dc-to-ac converter is connected the one end of first inductance, the second alternating current output end of dc-to-ac converter is connected the one end of second inductance, the other end of first inductance is as the first end of energy storage unit, the other end of second inductance is as the second end of energy storage unit.
4. The multiphase ring battery energy storage system of claim 3, wherein said energy storage device is a battery.
5. The multiphase ring battery energy storage system of claim 2, wherein the 1-M energy storage devices each comprise an equal number of energy storage cells.
6. The multiphase ring battery energy storage system of claim 3, wherein the phase of the fundamental wave of the output alternating voltage of each energy storage unit is different from that of the adjacent energy storage units by a fixed angle, and the product of the angle and the number of energy storage units in the energy storage system is 2 x pi, where pi is the circumferential rate.
7. The multi-phase ring battery energy storage system of claim 3, wherein the inverter is any single-phase four-port inverter including any of a two-level H-bridge inverter, a three-level I-inverter, and a three-level T-inverter.
8. The multiphase ring battery energy storage system of claim 7, wherein said inverter employs a two-level H-bridge configuration; the inverter comprises a first switching device T1, a second switching device T2, a first freewheeling diode D1, a second freewheeling diode D2 and a filter capacitor C1, wherein a control end of the first switching device T1 and a control end of the second switching device T2 are respectively used for being connected with an external control device, a first end of the switching device T1 is connected with a cathode of the first freewheeling diode D2 and a first end of the filter capacitor C1, a second end of the first switching device T1 is connected with an anode of the first freewheeling diode D1 and a first end of the second switching device T2, a cathode of the second freewheeling diode D2 is connected with a first end of the second switching device T2, and a second end of the second switching device T2 is connected with an anode of the second freewheeling diode D2 and a second end of the filter capacitor C1; a first terminal of the first switching device T1 serves as a first terminal of the inverter CV1, a second terminal of the second switching device T2 serves as second and fourth terminals of the inverter CV1, and a second terminal of the first switching device T1 serves as a third terminal of the inverter CV 1.
9. The multiphase ring battery energy storage system of claim 7, wherein said inverter is of a three level T-type configuration; the inverter comprises a first switching device T1, a second switching device T2, a third switching device T3, a fourth switching device T4, a first freewheeling diode D1, a second freewheeling diode D2, a third freewheeling diode D3, a fourth freewheeling diode D4, a filter capacitor C1 and a filter capacitor C2, wherein the control terminals of the first switching device T1, the second switching device T2, the third switching device T3 and the fourth switching device T4 are respectively used for connecting with an external control device, the first terminal of the switching device T1 is connected with the cathode of the first freewheeling diode D2 and the first terminal of the filter capacitor C1, the second terminal of the first switching device T1 is connected with the anode of the first freewheeling diode D1, the first terminal of the second switching device T2 and the anode of the third freewheeling diode D3, the cathode of the second freewheeling diode D2 is connected with the first terminal of the second switching device T2, the second terminal of the second switching device T2 is connected with the anode of the second freewheeling diode D2 and the anode of the second freewheeling diode D2, a second terminal of the third switching device T3 is connected to an anode of the third freewheeling diode D3, a third terminal of the third switching device T3 is connected to a cathode of the third freewheeling diode D3 and a cathode of the fourth freewheeling diode D4, a first terminal of the fourth switching device T4 is connected to a cathode of the fourth freewheeling diode D4, and a second terminal of the fourth switching device T4 is connected to an anode of the fourth freewheeling diode D4, a second terminal of the first filter capacitor C1 and a first terminal of the second filter capacitor C2; a first terminal of the first switching device T1 serves as a first terminal of the inverter CV1, a second terminal of the second switching device T2 serves as a second terminal of the inverter CV1, a second terminal of the first switching device T1 serves as a third terminal of the inverter CV1, and a second terminal of the fourth switching device T4 serves as a fourth terminal of the inverter CV 1.
10. The multiphase ring battery energy storage system of claim 9, wherein the first switching device T1, the second switching device T2, the third switching device T3 and the fourth switching device T4 are mosfets.
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