CN220822635U - Bidirectional DC-DC converter energy storage system - Google Patents
Bidirectional DC-DC converter energy storage system Download PDFInfo
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- CN220822635U CN220822635U CN202322577338.0U CN202322577338U CN220822635U CN 220822635 U CN220822635 U CN 220822635U CN 202322577338 U CN202322577338 U CN 202322577338U CN 220822635 U CN220822635 U CN 220822635U
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 100
- 238000004146 energy storage Methods 0.000 title claims abstract description 21
- 238000004891 communication Methods 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of energy storage, and particularly discloses a bidirectional DC-DC converter energy storage system which comprises a PWM bidirectional grid-connected off-grid converter, a hybrid inverter and a plurality of bidirectional DC-DC converters, wherein the bidirectional DC-DC converters are respectively connected with a rechargeable battery pack, the hybrid inverter is in communication connection with the bidirectional DC-DC converters, the PWM bidirectional grid-connected off-grid converter is electrically connected with the hybrid inverter, and the PWM bidirectional grid-connected off-grid converter is connected with a power grid. According to the utility model, the PWM bidirectional grid-connected converter is configured at the power grid end, the corresponding number of bidirectional DC-DC converters are configured at the battery end, when the battery pack is charged and discharged, the bidirectional DC-DC converters only need to feed back or absorb energy to the DC bus according to the system requirement, and the PWM bidirectional grid-connected converter ensures the stability of the DC bus voltage through bidirectional flow of the energy with the power grid, and has the characteristics of convenient operation, lower cost, low energy consumption and high conversion rate.
Description
Technical Field
The utility model relates to the technical field of energy storage, in particular to an energy storage system of a bidirectional DC-DC converter.
Background
In the usual practical application process, the bidirectional DC-DC converter is sometimes applied to an energy storage system with multiple battery packs. Because of the increased power, it is necessary to increase the battery voltage to achieve high power output, or else the battery side current may be relatively large, which may affect cost control and efficiency. The household energy storage scheme with the power exceeding 10KW in the market at present is realized by connecting battery modules in series to form high voltage and then connecting the battery modules into a high-voltage inverter, so that high-power output is basically realized, but if the capacity is required to be expanded, the operation is very inconvenient, and professional staff is required to operate the household energy storage scheme.
Disclosure of utility model
The technical problem to be solved by the utility model is to provide a bidirectional DC-DC converter energy storage system aiming at the defects in the prior art, a PWM bidirectional grid-off converter is arranged at a power grid end, a corresponding number of bidirectional DC-DC converters are arranged at a battery end, when a battery pack is charged and discharged, the bidirectional DC-DC converters only need to feed back or absorb energy to a DC bus according to the system requirements, and the PWM bidirectional grid-off converter ensures the stability of the voltage of the DC bus through bidirectional flow with the power grid energy, and has the characteristics of convenient operation, lower cost, low energy consumption and high conversion rate.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
The bidirectional DC-DC converter energy storage system comprises a PWM bidirectional grid-connected converter, a hybrid inverter and a plurality of bidirectional DC-DC converters, wherein the bidirectional DC-DC converters are respectively connected with a rechargeable battery pack, the hybrid inverter is in communication connection with the bidirectional DC-DC converters, the PWM bidirectional grid-connected converter is electrically connected with the hybrid inverter, and the PWM bidirectional grid-connected converter is connected with a power grid.
Preferably, the bidirectional DC-DC converter includes a master bidirectional DC-DC converter and a slave bidirectional DC-DC converter, and the master bidirectional DC-DC converter is connected in parallel with the slave bidirectional DC-DC converter.
Preferably, the host bidirectional DC-DC converter is responsible for communication with the hybrid inverter, which controls charging or discharging of the rechargeable battery pack through communication.
Preferably, the rechargeable battery pack employs a battery pack rated at 51.2V and rated at 200 AH.
Preferably, the hybrid inverter adopts a10 KW hybrid inverter, and the hybrid inverter is respectively connected with an alternating current 380V power grid, an alternating current 380V load and a photovoltaic panel.
Preferably, the bidirectional DC-DC converter is used as a voltage source for output when the power grid is disconnected, namely, the bidirectional DC-DC converter works in a Boost mode, the output voltage Vdc is stable, and the latter-stage PWM bidirectional grid-off converter operates as a bird arc, so that the power supply of a key load is ensured.
By adopting the technical scheme, the bidirectional DC-DC converter energy storage system provided by the utility model has the following beneficial effects: the utility model adopts a topological form formed by a plurality of bidirectional DC-DC converters and +1 PWM bidirectional grid-connected converters, the topological structure is characterized by being compact and simple, the cost performance is very high, namely, a PWM bidirectional grid-connected converter is configured at the power grid end, a corresponding number of bidirectional DC-DC converters are configured at the battery end according to the number of the battery, if the connection point voltage of the bidirectional DC-DC converters and the PWM bidirectional grid-connected converters is called direct current bus voltage (Vdc), when the battery is charged or discharged, the bidirectional DC-DC converters only need to supply energy to a direct current bus or absorb energy back according to the system requirement, and the PWM bidirectional grid-connected converters ensure the stability of the direct current bus voltage (c) through bidirectional flow with the energy of the power grid; once the power grid is powered off, the bidirectional DC-DC converter can also be used as a voltage source for output, namely, the bidirectional DC-DC converter works in a Boost mode, the output voltage Vdc is stable, and the latter-stage PWM bidirectional grid-off converter operates as a bird arc, so that the power supply of a key load is ensured. The utility model can meet the parallel operation of the multi-lithium battery energy storage system, realizes the production modularization, reduces the cost and has the characteristics of low energy consumption and high conversion rate.
Drawings
FIG. 1 is a block diagram of a first embodiment of the present utility model;
FIG. 2 is a schematic circuit diagram of the present utility model;
In the figure, a 1-PWM bidirectional grid-off converter, a 2-hybrid inverter, a 3-master bidirectional DC-DC converter, a 4-slave bidirectional DC-DC converter, a 5-rechargeable battery pack and a 6-power grid are adopted.
Detailed Description
The following describes the embodiments of the present utility model further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present utility model, but is not intended to limit the present utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
As shown in fig. 1-2, the bidirectional DC-DC converter energy storage system includes a PWM bidirectional off-grid converter 1, a hybrid inverter 2, and a plurality of bidirectional DC-DC converters, where the bidirectional DC-DC converters are respectively connected with a rechargeable battery pack 5, the hybrid inverter 2 is communicatively connected with the bidirectional DC-DC converter, the PWM bidirectional off-grid converter 1 is electrically connected with the hybrid inverter 2, and the PWM bidirectional off-grid converter 1 is connected with a power grid 6. It can be understood that the utility model is formed by a plurality of 60kW bidirectional DC-DC converters matched with a plurality of groups of batteries to supply power and connected with a hybrid inverter, the host bidirectional DC-DC converter 3 is responsible for communicating with the hybrid inverter 2 through the parallel operation of communication among the bidirectional DC-DC converters, and the hybrid inverter 2 controls the charging or discharging of the rechargeable battery pack through the communication.
Specifically, the bidirectional DC-DC converter includes a master bidirectional DC-DC converter 3 and a slave bidirectional DC-DC converter 4, and the master bidirectional DC-DC converter 3 is connected in parallel with the slave bidirectional DC-DC converter 4; the host bidirectional DC-DC converter 3 is responsible for communicating with the hybrid inverter 2, and the hybrid inverter 2 controls the charging or discharging of the rechargeable battery pack 5 through communication; the hybrid inverter 2 adopts a 10KW hybrid inverter, and the hybrid inverter 2 is respectively connected with an alternating current 380V power grid, an alternating current 380V load and a photovoltaic panel; the bidirectional DC-DC converter is used as a voltage source for output when a power grid is powered off, namely, the bidirectional DC-DC converter works in a Boost mode, the output voltage Vdc is stable, and the latter-stage PWM bidirectional grid-off converter operates as a bird arc, so that the power supply of a key load is ensured. As will be appreciated, the rechargeable battery pack 5 employs a battery pack rated at 51.2V and rated at 200 AH.
It can be understood that the utility model has reasonable design and unique construction, adopts a topological form formed by a plurality of bidirectional DC-DC converters and +1 PWM bidirectional grid-connected converters, has the greatest characteristics of simplicity and compactness and very high cost performance, namely, a PWM bidirectional grid-connected converter 1 is configured at a power grid end, a corresponding number of bidirectional DC-DC converters are configured at a charging battery pack end according to the number of battery packs, if the voltage of the connection point of the bidirectional DC-DC converters and the PWM bidirectional grid-connected converter 1 is called direct current bus voltage (Vdc), when the charging battery pack 5 is charged or discharged, the bidirectional DC-DC converters only need to feed back or absorb energy to a direct current bus according to the system requirement, and the PWM bidirectional grid-connected converter 1 ensures the stability of the direct current bus voltage (Vdc) through the bidirectional flow of the energy with the power grid; once the power grid is powered off, the bidirectional DC-DC converter can also be used as a voltage source for output, namely, the bidirectional DC-DC converter works in a Boost mode, the output voltage Vdc is stable, and the latter-stage PWM bidirectional grid-off converter operates as a bird arc, so that the power supply of a key load is ensured. The utility model can meet the parallel operation of the multi-lithium battery energy storage system, realizes the production modularization, reduces the cost, has the characteristics of low energy consumption and high conversion rate, can realize high-power output, and is convenient to operate when the capacity is required to be expanded.
The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the utility model, and yet fall within the scope of the utility model.
Claims (6)
1. A bi-directional DC-DC converter energy storage system, characterized by: the system comprises a PWM bidirectional grid-connected converter, a hybrid inverter and a plurality of bidirectional DC-DC converters, wherein the bidirectional DC-DC converters are respectively connected with a rechargeable battery pack, the hybrid inverter is in communication connection with the bidirectional DC-DC converters, the PWM bidirectional grid-connected converter is electrically connected with the hybrid inverter, and the PWM bidirectional grid-connected converter is connected with a power grid.
2. The bi-directional DC-DC converter energy storage system of claim 1, wherein: the bidirectional DC-DC converter comprises a master bidirectional DC-DC converter and a slave bidirectional DC-DC converter, and the master bidirectional DC-DC converter is connected with the slave bidirectional DC-DC converter in parallel.
3. The bi-directional DC-DC converter energy storage system of claim 2, wherein: the host bidirectional DC-DC converter is in charge of communicating with the hybrid inverter, and the hybrid inverter controls the charging or discharging of the rechargeable battery pack through communication.
4. The bi-directional DC-DC converter energy storage system of claim 1, wherein: the rechargeable battery pack adopts a battery pack with rated voltage of 51.2V and rated current of 200 AH.
5. The bi-directional DC-DC converter energy storage system of claim 1, wherein: the hybrid inverter adopts a 10KW hybrid inverter, and the hybrid inverter is respectively connected with an alternating current 380V power grid, an alternating current 380V load and a photovoltaic panel.
6. The bi-directional DC-DC converter energy storage system of claim 1, wherein: the bidirectional DC-DC converter is used as a voltage source for output when the power grid is disconnected, namely, the bidirectional DC-DC converter works in a Boost mode, the output voltage Vdc is stable, and the latter-stage PWM bidirectional grid-connected converter operates as a bird arc, so that the power supply of a key load is ensured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322577338.0U CN220822635U (en) | 2023-09-22 | 2023-09-22 | Bidirectional DC-DC converter energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322577338.0U CN220822635U (en) | 2023-09-22 | 2023-09-22 | Bidirectional DC-DC converter energy storage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220822635U true CN220822635U (en) | 2024-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322577338.0U Active CN220822635U (en) | 2023-09-22 | 2023-09-22 | Bidirectional DC-DC converter energy storage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220822635U (en) |
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2023
- 2023-09-22 CN CN202322577338.0U patent/CN220822635U/en active Active
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