CN210780126U - Two-way-one-to-one series-parallel micro-grid structure suitable for multi-station fusion - Google Patents
Two-way-one-to-one series-parallel micro-grid structure suitable for multi-station fusion Download PDFInfo
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Abstract
A 'two-way-to-one-way' series-parallel micro-grid structure suitable for 'multi-station fusion' is formed by series-parallel connection of an alternating current sub-micro-grid 1, an alternating current sub-micro-grid 2 and a direct current sub-micro-grid; the alternating current sub-microgrid 1 is connected with the direct current sub-microgrid through a power supply conversion device and a connection point 1, and the alternating current sub-microgrid 2 is connected with the direct current sub-microgrid through a connection point 2; the connection point 1 and the connection point 2 are both DC/AC conversion devices, the connection point 2 is a standby power supply point of the connection point 1, the energy of the connection point 2 can only flow in a single direction, and the voltage of the DC sub-microgrid can be rapidly supported only when the connection point 1 fails; the AC sub-microgrid 2 comprises a No. 2 transformer for energy storage and station, a 400V/380V isolation transformer, an energy storage battery and an AC/DC conversion device; the No. 2 energy storage and station-compatible transformer is respectively connected with an external network, a 400V/380V isolation transformer and an AC/DC conversion device, and the AC/DC conversion device is connected with an energy storage battery. The utility model discloses the reliability is high, and the wide, the deep and economic nature of degree of fusion of coverage is excellent.
Description
Technical Field
The utility model relates to a series-parallel connection microgrid structure technical field, concretely relates to "two are handed over always" series-parallel connection microgrid structure suitable for "multistation fuses".
Background
With the development of the energy industry, the structural form of energy has been greatly changed compared with the traditional form, and the research on the key technology of the micro-grid and the exploration on the construction mode of the micro-grid in various forms have become the advancing direction of the energy industry.
The construction of the comprehensive intelligent energy station which is rapidly developed becomes the inevitable trend of the development of the current electric power industry, and the system status and the diversified social service attributes of the novel intelligent energy station determine the great change of the novel intelligent energy station compared with the traditional transformer substation. As an important energy complex of future regionality, the comprehensive energy station mainly highlights the following functions:
(1) besides the traditional mode of providing stable and reliable power supply for various high-load-demand customers in the region, the system can simultaneously and efficiently provide various energy supply services such as cold and heat for the customers in the region. The requirements of various energy forms in an area are met in a one-stop mode through a micro-grid and a micro-energy grid;
(2) large-scale and high-reliability data support service is provided for high and new enterprises such as regional high-precision manufacturing, large-capacity warehouse logistics and the like;
(3) friendly non-discrimination access service is provided for various forms of clean low-carbon energy in the region;
(4) the method provides the charging service of the electric automobile for the society and realizes friendly interaction between the electric automobile and a power grid;
(5) the intelligent power grid and the power Internet of things industrial chain are driven to develop upstream and downstream together, and a co-construction, co-treatment and co-win energy power ecological cycle and an energy Internet ecological cycle are created.
The reliability of present wisdom energy station is low, can not accomplish the overall balance of load, and the degree of fusion is not dark, and rate of equipment utilization is low, and the coverage is narrow, and the efficiency is low, therefore system adaptability is poor, and the cost investment is high.
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 the reliability height, the wide, two friendship that "two friendship always" series-parallel micro-grid structure that fusion degree is dark and economic nature is excellent that is applicable to "multistation fuses".
The utility model provides a technical scheme that its technical problem adopted is: a 'two-way-to-one-way' series-parallel micro-grid structure suitable for 'multi-station fusion' is formed by series-parallel connection of an alternating current sub-micro-grid 1, an alternating current sub-micro-grid 2 and a direct current sub-micro-grid; the alternating current sub-microgrid 1 is connected with the direct current sub-microgrid through a power supply conversion device and a connection point 1, and the alternating current sub-microgrid 2 is connected with the direct current sub-microgrid through a connection point 2; the alternating-current sub-micro-grid 1 and the direct-current sub-micro-grid can realize bidirectional energy flow through the connection point 1, the shaped loads are complementary, and clean energy such as photovoltaic energy can be completely consumed on site through the direct-current sub-micro-grid and the alternating-current sub-micro-grid 1.
Furthermore, the connection point 1 and the connection point 2 are DC/AC conversion devices, the connection point 2 is a standby power supply point of the connection point 1, energy of the connection point 2 can only flow in a single direction, and voltage is rapidly supported by the DC sub-microgrid only when the connection point 1 fails; the power supply of the two ends of the 750V direct current bus is ensured, and the reliability is improved.
Further, the alternating current sub-microgrid 1 comprises a No. 1 transformer for energy storage and station use, a 400V/380V isolation transformer, an energy storage battery and an AC/DC conversion device; the No. 1 energy storage and station-compatible transformer is respectively connected with an external network, a 400V/380V isolation transformer and an AC/DC conversion device, and the AC/DC conversion device is connected with an energy storage battery.
Further, the alternating current sub-microgrid 2 comprises a No. 2 transformer for energy storage and station use, a 400V/380V isolation transformer, an energy storage battery and an AC/DC conversion device; the No. 2 energy storage and station-compatible transformer is respectively connected with an external network, a 400V/380V isolation transformer and an AC/DC conversion device, and the AC/DC conversion device is connected with an energy storage battery.
Further, the direct current microgrid comprises a power conversion device connected with the alternating current microgrid 1, a 750V direct current bus and a 220V direct current bus, wherein the power conversion device comprises an AC380V/DC750V conversion device and an AC380V/DC220V conversion device, the AC380V/DC750V conversion device is connected with a data center, the AC380V/DC220V conversion device is connected with the 220V direct current bus, and the 750V direct current bus is respectively connected with a connection point 1 and a connection point 2; the conventional 220V direct-current power supply system of the transformer substation is fused, and the total-station alternating-current and direct-current load is comprehensively covered by the series-parallel micro-grid, so that the control is integrated.
Furthermore, the 750V direct current buses are connected with a data center, a super capacitor, total station indoor lighting, a charging pile and photovoltaic energy through DC/DC conversion devices.
Furthermore, the 220V direct current buses are connected with a protection measurement and control power supply, a communication power supply and a super capacitor through DC/DC conversion devices.
Further, the alternating current sub-microgrid 1 is connected with a data center air conditioner 1, a battery compartment air conditioner and a transformer substation alternating current load through a 400V/380V isolation transformer; the AC sub-microgrid 2 is connected with a data center air conditioner 2, an AC charging pile and a transformer substation AC load through a 400V/380V isolation transformer.
The utility model has the advantages that:
1. the reliability is high: the alternating current and direct current hybrid power supply is realized, the two alternating current sub-micro-grids realize mutual interconnection and mutual backup through the direct current sub-micro-grid, and the power supply reliability of the micro-grid scheme can reach 99.9999% through modeling simulation calculation; the two AC sub-micro-grids are connected by adopting 380V voltage levels and a single bus, and the AC sub-micro-grids cover all AC loads of a whole substation such as a traditional AC load of a transformer substation, a data center and an energy storage system air conditioner. The two AC sub-micro-grids are respectively connected with the DC sub-micro-grid to form interconnection and mutual backup of a series-parallel micro-grid group, a distributed energy optimization consumption way is sought, the overall balance of the total station AC/DC load on site is realized, the micro-grid can be ensured to run safely and stably under the island condition, and safe, high-quality and stable power supply is provided for the total station AC/DC load;
2. the coverage is wide: the total station alternating current and direct current loads are comprehensively brought into the microgrid group, and integrated construction and unified management are realized; meanwhile, a high-quality digestion environment is created for clean energy; the monopole network is selected to simplify the architecture and control strategy. All power electronic elements such as AC/DC, DC/DC and the like adopt modular redundancy configuration, and a simple and efficient topological form is utilized, so that the protection and control strategy of the direct current sub microgrid is naturally simplified, adverse factors such as misoperation, refusal operation, excessive operation and the like of microgrid protection caused by complex structure and complicated logic are eliminated, and the reliability of the grid structure is greatly improved;
3. and (3) deep fusion degree: the energy storage system is deeply integrated with the AC/DC sub-microgrid, the energy storage transformer and the transformer for the station are integrated, and the conventional DC power supply system in the station is integrated, so that a UPS (uninterrupted power supply) is omitted, equipment is utilized to the maximum extent, and the energy efficiency is improved; energy storage is optimally configured, and the functions of the energy storage in different scenes such as peak shaving, frequency modulation and the like are exerted to the maximum extent. The energy storage is directly connected into a 10kV alternating current main network from the alternating current sub-microgrid, the conversion link is reduced, the energy storage charging and discharging characteristics are utilized to the maximum extent, the capacity of a multiplexing deep-playing section is used as a standby for the direct current sub-microgrid, the running strategies of all energy storage units are kept consistent, the cooperative control is facilitated, and the use efficiency of equipment is improved;
4. the economic efficiency is excellent: aiming at the problems of single parameter model and high equipment cost of the existing micro-grid, direct current and other equipment, the self-adaptability of the micro-grid is enhanced, and all the equipment adopts more conventional parameter forms and specifications, so that the multifunctional micro-grid can meet various functional requirements and can be applied to practical engineering application; the microgrid scheme inherits the modularized construction concept, and the later expansion can be conveniently and modularly copied according to the first-stage scheme. The scale of the energy station in the current period and the remote period and the construction time sequence are matched, the operation condition and the access of external distributed energy and the change of internal load are flexibly adapted, the extension mode of the remote micro-grid is adjusted according to local conditions, and the first-stage engineering investment is reduced.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The following embodiments are described in detail with reference to the following examples:
as shown in fig. 1, an embodiment of a "two-ac-one-dc" hybrid microgrid structure suitable for "multi-station fusion" is formed by hybrid connection of an ac microgrid 1, an ac microgrid 2 and a dc microgrid; the alternating-current sub-microgrid 1 is connected with the direct-current sub-microgrid through a power supply conversion device and a connection point 1 respectively, and the alternating-current sub-microgrid 1 comprises a No. 1 transformer for energy storage and station use, a 400V/380V isolation transformer, an energy storage battery and an AC/DC conversion device; the No. 1 energy storage and station-compatible transformer is respectively connected with an external network, a 400V/380V isolation transformer and an AC/DC conversion device, the AC/DC conversion device is connected with an energy storage battery, and the AC sub-microgrid 1 is connected with a data center air conditioner 1, a battery compartment air conditioner and a transformer substation AC load through the 400V/380V isolation transformer.
The alternating current sub-microgrid 2 is connected with the direct current sub-microgrid through a connection point 2; the connection point 1 and the connection point 2 are DC/AC conversion devices, the connection point 2 is a standby power supply point of the connection point 1, the energy of the connection point 2 can only flow in a single direction, and the direct current sub-microgrid can be rapidly supported by voltage only when the connection point 1 fails; the AC sub-microgrid 2 comprises a No. 2 transformer for energy storage and station, a 400V/380V isolation transformer, an energy storage battery and an AC/DC conversion device; the No. 2 energy storage and station-compatible transformer is respectively connected with an external network, a 400V/380V isolation transformer and an AC/DC conversion device, and the AC/DC conversion device is connected with an energy storage battery; the AC sub-microgrid 2 is connected with a data center air conditioner 2, an AC charging pile and a transformer substation AC load through a 400V/380V isolation transformer.
The direct current sub-microgrid comprises a power conversion device, a 750V direct current bus and a 220V direct current bus, wherein the power conversion device is connected with the alternating current sub-microgrid 1 and comprises an AC380V/DC750V conversion device and an AC380V/DC220V conversion device, the AC380V/DC750V conversion device is connected with a data center, the AC380V/DC220V conversion device is connected with the 220V direct current bus, and the 750V direct current bus is respectively connected with a connection point 1 and a connection point 2; the 750V direct current buses are connected with a data center, a super capacitor, total-station indoor lighting, a charging pile and photovoltaic energy through a DC/DC conversion device; the 220V direct current buses are connected with a protection measurement and control power supply, a communication power supply and a super capacitor through a DC/DC conversion device.
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 (8)
1. A two-way and one-way series-parallel micro-grid structure suitable for multi-station fusion is characterized by being formed by series-parallel connection of an alternating current sub-micro-grid 1, an alternating current sub-micro-grid 2 and a direct current sub-micro-grid; the alternating current sub-microgrid 1 is connected with the direct current sub-microgrid through a power supply conversion device and a connection point 1, and the alternating current sub-microgrid 2 is connected with the direct current sub-microgrid through a connection point 2.
2. The structure of claim 1, wherein the connection point 1 and the connection point 2 are DC/AC conversion devices, the connection point 2 is a backup power supply point of the connection point 1, and the energy of the connection point 2 can only flow in one direction, and only supports voltage to the DC sub-microgrid when the connection point 1 fails.
3. The structure of the 'two-way-one-way' hybrid microgrid suitable for 'multi-station fusion' of claim 1 or 2, wherein the alternating-current sub-microgrid 1 comprises a number 1 energy storage station-compatible transformer, a 400V/380V isolation transformer, an energy storage battery and an AC/DC conversion device; the No. 1 energy storage and station-compatible transformer is respectively connected with an external network, a 400V/380V isolation transformer and an AC/DC conversion device, and the AC/DC conversion device is connected with an energy storage battery.
4. The structure of claim 3, wherein the AC microgrid sub-grid 2 comprises a number 2 energy storage and station-compatible transformer, a 400V/380V isolation transformer, an energy storage battery, and an AC/DC conversion device; the No. 2 energy storage and station-compatible transformer is respectively connected with an external network, a 400V/380V isolation transformer and an AC/DC conversion device, and the AC/DC conversion device is connected with an energy storage battery.
5. The structure of claim 4, wherein the DC microgrid comprises power conversion devices connected to the AC microgrid 1, 750V DC buses and 220V DC buses, the power conversion devices comprise AC380V/DC750V conversion devices and AC380V/DC220V conversion devices, the AC380V/DC750V conversion devices are connected to the data center, the AC380V/DC220V conversion devices are connected to the 220V DC buses, and the 750V DC buses are respectively connected to the connection point 1 and the connection point 2.
6. The structure of claim 5, wherein the 750V DC buses are connected with a data center, a super capacitor, total-station indoor lighting, a charging pile and a photovoltaic energy source through DC/DC conversion devices.
7. The two-AC-one-DC hybrid microgrid structure suitable for multi-station fusion is characterized in that the 220V direct-current buses are connected with a protection measurement and control power supply, a communication power supply and a super capacitor through DC/DC conversion devices.
8. The structure of claim 7, wherein the ac sub-microgrid 1 is connected with a data center air conditioner 1, a battery compartment air conditioner and a substation ac load through a 400V/380V isolation transformer; the AC sub-microgrid 2 is connected with a data center air conditioner 2, an AC charging pile and a transformer substation AC load through a 400V/380V isolation transformer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783196A (en) * | 2021-08-20 | 2021-12-10 | 国网湖南省电力有限公司节能管理分公司 | Power supply system of intelligent energy station |
| CN113904553A (en) * | 2021-10-28 | 2022-01-07 | 上海电气集团股份有限公司 | Multi-port and dual-channel hybrid system with multi-energy conversion device as core |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783196A (en) * | 2021-08-20 | 2021-12-10 | 国网湖南省电力有限公司节能管理分公司 | Power supply system of intelligent energy station |
| CN113904553A (en) * | 2021-10-28 | 2022-01-07 | 上海电气集团股份有限公司 | Multi-port and dual-channel hybrid system with multi-energy conversion device as core |
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