CN210780096U - Energy storage and station transformer structure suitable for alternating current-direct current series-parallel micro-grid - Google Patents
Energy storage and station transformer structure suitable for alternating current-direct current series-parallel micro-grid Download PDFInfo
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- CN210780096U CN210780096U CN201921840231.8U CN201921840231U CN210780096U CN 210780096 U CN210780096 U CN 210780096U CN 201921840231 U CN201921840231 U CN 201921840231U CN 210780096 U CN210780096 U CN 210780096U
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Abstract
The transformer structure for the energy storage and station applicable to the alternating current-direct current series-parallel micro-grid comprises a transformer for the energy storage and station, a direct current micro-grid and an energy storage system, wherein the transformer for the energy storage and station is connected with an alternating current large power grid, the direct current micro-grid and the energy storage system are respectively connected to the low-voltage side of the transformer for the energy storage and station through an AC/DC conversion device and a PCS conversion device, the low-voltage side of the transformer for the energy storage and station is connected with an alternating current micro-grid of a transformer substation through an isolation transformer, an isolator is a 400V/380V isolation transformer, the AC/DC conversion device is an AC400V/DC750V conversion device, and the voltage of the direct current side of the PCS conversion. The energy storage system comprises an energy storage battery. The utility model discloses make full use of energy storage battery charge-discharge characteristic unites two into one two kinds of transformers, on the basis that satisfies the functional requirement, reduces the equipment investment greatly.
Description
Technical Field
The utility model relates to a transformer substation technical field, concretely relates to transformer structure is used in energy storage doubling as a station suitable for "alternating current-direct current series-parallel connection microgrid".
Background
The multi-station integrated intelligent energy station AC/DC micro-grid has the functions of balancing source, load and storage. At present, the common scheme of the transformer configuration for the domestic 'multi-station integration' station is as follows: 1 energy storage bidirectional transformer is configured for the interaction power of the energy storage system and the alternating current large power grid; the transformer for 1 station is configured for providing a main power supply for AC/DC loads in the station, and the configuration mode has a simpler structural form and is suitable for projects with smaller capacity.
However, for a project with a large energy storage scale, the transformer capacity required by the energy storage system is large, the number of transformers is large, if a conventional transformer for a station is considered, the configuration of transformer equipment is too much, the energy storage system generally adopts a one-day cycle mode, the transformers are not charged and discharged in off-peak periods of non-power peaks, and at the moment, the energy storage transformer is in a shutdown state, the utilization efficiency of the equipment is low, and the economic cost and the land use cost are increased.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is, overcome the above-mentioned defect that prior art exists, provide make full use of energy storage battery charge-discharge characteristic, unite two into one two kinds of transformers, on the basis that satisfies the functional requirement, reduce the energy storage that is applicable to "alternating current-direct current series-parallel connection microgrid" of equipment investment greatly and use transformer structure in standing concurrently.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides an energy storage is transformer structure for station concurrently suitable for "alternating current-direct current series-parallel connection microgrid", includes that energy storage is station transformer, direct current microgrid and energy storage system concurrently, the station transformer is used concurrently in the energy storage is connected with exchanging big electric wire netting, direct current microgrid and energy storage system connect the low pressure side at the station transformer is used concurrently in the energy storage through AC/DC and PCS conversion equipment respectively, the low pressure side of station transformer is used concurrently in the energy storage is connected with the station alternating current microgrid of transformer substation through isolation transformer.
Further, the isolation transformer is a 400V/380V isolation transformer.
Further, the AC/DC conversion device is an AC400V/DC750V conversion device; the direct-current side voltage of the PCS conversion device is determined according to the energy storage battery pack string mode.
Further, the energy storage system comprises an energy storage battery.
The utility model has the advantages that the running mode of the transformer fully utilizes the technical characteristics of energy storage of low-power charging and full-power discharging, changes along with the charging and discharging strategy of the energy storage battery, when the battery is charged, the transformer transmits power from the high-voltage side to the low-voltage side, and the residual capacity is charged for the battery on the basis of meeting the requirements of AC/DC load; when the battery discharges, the transformer transmits power from the low-voltage side to the high-voltage side, and the residual power is discharged to the high-voltage side alternating-current large power grid on the basis that the power released by the battery meets the requirements of alternating-current and direct-current loads; when the battery is not charged or discharged, the transformer transmits power from the high-voltage side to the low-voltage side, and the load requirement of the micro-grid is met. Under 3 different working conditions, the transformer can be ensured to be in a working state, and equipment is not idle; meanwhile, an extra transformer for the station is not needed, and the equipment investment is saved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
1. The system comprises an alternating current large power grid, 11 an energy storage station-used transformer, 12 an isolation transformer, 13 an alternating current micro-grid, 21 an AC/DC conversion device, 211 a direct current micro-grid, 22 a PCS conversion device, 221 and an energy storage system.
Detailed Description
The following embodiments are described in detail with reference to the following examples:
as shown in fig. 1, an embodiment of a transformer structure for energy storage and station use suitable for an "AC/DC series-parallel microgrid" includes an energy storage and station use transformer 11, a DC microgrid 211, an AC microgrid 13, and an energy storage system 221, where the energy storage system 221 includes energy storage batteries, the energy storage and station use transformer 11 is connected to an AC power grid, the DC microgrid 211 and the energy storage system 221 are connected to a low-voltage side of the energy storage and station use transformer 11 through an AC/DC converter and a PCS device, respectively, the AC/DC converter 21 is an AC400V/DC750V converter, and a DC side voltage of the PCS converter 22 depends on a series connection mode of the energy storage batteries.
The low-voltage side of the transformer 11 for energy storage and station is connected with the alternating-current microgrid 13 through an isolation transformer 12, and the isolator 12 is a 400V/380V isolation transformer.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be considered to be within the protection scope of the present invention.
Those not described in detail in the specification are well within the skill of the art.
Claims (4)
1. The utility model provides an energy storage is transformer structure for station concurrently suitable for "alternating current-direct current series-parallel connection microgrid", its characterized in that, including energy storage is transformer for station concurrently, direct current microgrid and energy storage system, the transformer for station concurrently is connected with exchanging big electric wire netting for the energy storage, direct current microgrid and energy storage system connect the low pressure side at the transformer for station concurrently through AC/DC conversion equipment and PCS conversion equipment respectively, the low pressure side of transformer for station concurrently is connected with the transformer substation exchanges the microgrid through isolation transformer.
2. The transformer structure suitable for the AC/DC hybrid microgrid for the energy storage and power station as claimed in claim 1, wherein the isolation transformer is a 400V/380V isolation transformer.
3. The transformer structure suitable for the AC/DC hybrid microgrid as claimed in claim 2, wherein the AC/DC conversion device is an AC400V/DC750V conversion device, and the DC side voltage of the PCS conversion device depends on the manner of the energy storage battery string.
4. The transformer structure for the energy storage and power station suitable for the AC-DC hybrid microgrid as claimed in claim 3, wherein the energy storage system comprises an energy storage battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921840231.8U CN210780096U (en) | 2019-10-30 | 2019-10-30 | Energy storage and station transformer structure suitable for alternating current-direct current series-parallel micro-grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921840231.8U CN210780096U (en) | 2019-10-30 | 2019-10-30 | Energy storage and station transformer structure suitable for alternating current-direct current series-parallel micro-grid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210780096U true CN210780096U (en) | 2020-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921840231.8U Active CN210780096U (en) | 2019-10-30 | 2019-10-30 | Energy storage and station transformer structure suitable for alternating current-direct current series-parallel micro-grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210780096U (en) |
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2019
- 2019-10-30 CN CN201921840231.8U patent/CN210780096U/en active Active
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