阅读说明：本技术 一种智慧能源站供电系统 (Power supply system of intelligent energy station ) 是由 徐勇 陈宏� 俞乾 何军民 曾麟 向运琨 何哲 宁振华 于 2021-08-20 设计创作，主要内容包括：本发明公开了一种智慧能源站供电系统,包括第一交流子微网、第二交流子微网、第一变压器、第二变压器、直流子微网以及两段交流母线,所述两段交流母线包括交流母线I和交流母线II,所述第一交流子微网通过第一变压器与交流母线I连接,所述第二交流子微网通过第二变压器与交流母线II连接,第一交流子微网、第二交流子微网、直流子微网三者相互连接。通过上述结构构成了“两交一直微网群”的拓扑结构,可实现能源互通,通过直流子微网可为直流负荷供电或者清洁电站联网,有效减少站内电能转换带来的能量损耗,提升全站供电能力的可靠性,同时实现站内清洁能源最大化利用,提升全站的综合效益。(The invention discloses a power supply system of an intelligent energy station, which comprises a first alternating current sub-microgrid, a second alternating current sub-microgrid, a first transformer, a second transformer, a direct current sub-microgrid and two sections of alternating current buses, wherein the two sections of alternating current buses comprise an alternating current bus I and an alternating current bus II, the first alternating current sub-microgrid is connected with the alternating current bus I through the first transformer, the second alternating current sub-microgrid is connected with the alternating current bus II through the second transformer, and the first alternating current sub-microgrid, the second alternating current sub-microgrid and the direct current sub-microgrid are connected with one another. The topological structure of the two-way-one-time micro-grid group is formed through the structure, energy intercommunication can be realized, direct-current load power supply or clean power station networking can be realized through the direct-current sub-micro-grid, energy loss caused by electric energy conversion in the station is effectively reduced, reliability of power supply capacity of the total station is improved, meanwhile, the maximum utilization of clean energy in the station is realized, and comprehensive benefits of the total station are improved.)

1. The utility model provides a wisdom energy resource station power supply system, its characterized in that, exchanges sub-microgrid (2), first transformer (3), second transformer (4), direct current sub-microgrid (5) and two sections and exchanges the generating line including first interchange sub-microgrid (1), second, two sections interchange generating lines include interchange bus I and interchange bus II, first interchange sub-microgrid (1) is connected with interchange bus I through first transformer (3), second exchanges sub-microgrid (2) and is connected with interchange bus II through second transformer (4), first interchange sub-microgrid (1), second interchange sub-microgrid (2), direct current sub-microgrid (5) interconnect.

2. The system according to claim 1, wherein the first AC microgrid (1) comprises a first AC bus, a first isolation transformer (11), a first AC/DC converter device (12), a first energy storage module (13) and an energy storage converter (14), the first AC bus is connected to the first AC bus I through a first transformer (3), the first AC bus is further connected to the DC microgrid (5) through the energy storage converter (14), is connected to the first energy storage module (13) through the first AC/DC converter device (12) and is connected to the first isolation transformer (11).

3. The system according to claim 2, wherein the second AC microgrid (2) comprises a second AC bus, a third isolation transformer (21), a second AC/DC converter (22), a second energy storage module (23) and a third AC/DC converter (24), the second AC bus is connected to the AC bus II via a second transformer (4), the second AC bus is further connected to the DC microgrid (5) via the third AC/DC converter (24), the second energy storage module (23) via the second AC/DC converter (22) and the third isolation transformer (21).

4. The system according to claim 3, wherein a tie switch is connected between the first AC bus and the second AC bus.

5. The intelligent energy station power supply system according to claim 4, wherein the direct current sub-microgrid (5) comprises direct current buses connected to direct current outputs of the first alternating current sub-microgrid (1) and the second alternating current sub-microgrid (2), respectively, and a DC/DC conversion unit block comprising one or more DC/DC conversion modules for mounting part or all of a data center, a super capacitor, total station indoor lighting, a charging pile, and a photovoltaic on the direct current buses.

6. The system according to claim 5, wherein the DC sub-microgrid (5) further comprises a fourth AC/DC converter device (51), the first AC sub-microgrid (1) further comprises a second isolation transformer (15), a DC side of the fourth AC/DC converter device (51) provides a second redundant power supply for the data center, and an AC side of the fourth AC/DC converter device (51) is connected to the first AC bus of the first AC sub-microgrid (1) through the second isolation transformer (15).

7. The system according to claim 6, wherein at least one of the AC bus I and the AC bus II is provided with an energy storage unit (6), the energy storage unit (6) comprises an energy storage transformer, an AC/DC module and an energy storage module, and the energy storage module is a storage battery or a super capacitor.

8. The system according to claim 7, wherein the ac bus I is connected to an external high voltage power supply, the ac bus II is connected to an incoming ac high voltage bus through a main transformer, and a tie switch is connected between the ac bus I and the ac bus II.

9. The system according to claim 8, wherein the first transformer (3) and the second transformer (4) are energy storage bidirectional transformers.

10. The system according to claim 9, wherein the dc bus is a dc bus with a voltage level of 750V, the AC bus I and the AC bus II are both AC buses with a voltage level of 10KV, and the first AC bus and the second AC bus are both AC400V buses.

Technical Field

The invention relates to a power supply system, in particular to a power supply system of an intelligent energy station.

Background

In the face of the problem of 'double height' of the modern power grid, an energy storage technology must be vigorously developed, otherwise, the large-scale utilization of clean energy cannot be realized. With the falling of new capital construction policies in China, new energy automobile charging piles and large data centers become key directions of national construction. The traditional transformer substation is used as a junction of a power system, and plays a role in electric energy conversion. With the continuous development of the power industry, the intelligent energy station is built based on the traditional transformer substation to become the development trend of the industry.

Novel wisdom energy station uses the transformer substation as the core, and the innovation construction mode realizes that distributed new forms of energy integration such as transformer substation, energy storage station, data center, electric automobile fill and trade power station, photovoltaic system fuses and friendly interdynamic, realizes energy flow, data flow, business flow unification, promotes the electric wire netting comprehensive benefits, satisfies the urban construction and to the comprehensive requirement of energy, environment.

The power supply system of the conventional transformer substation is developed for many years, the technical aspect is mature, the system topology structure of the transformer substation is changed greatly along with the construction and development of the intelligent energy station, and a reliable, efficient and energy-saving power supply mode suitable for the intelligent energy station is urgently needed.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the invention aims to effectively reduce energy loss caused by electric energy conversion in a station, improve reliability of power supply capacity of the total station, simultaneously realize maximum utilization of clean energy in the station and improve comprehensive benefits of the total station.

In order to solve the technical problems, the invention adopts the technical scheme that:

the utility model provides a wisdom energy resource station power supply system, includes first interchange sub-microgrid, second interchange sub-microgrid, first transformer, second transformer, direct current sub-microgrid and two sections alternating-current bus, two sections alternating-current bus include interchange bus I and interchange bus II, first interchange sub-microgrid passes through first transformer and is connected with interchange bus I, second interchange sub-microgrid passes through the second transformer and is connected with interchange bus II, first interchange sub-microgrid, second interchange sub-microgrid, direct current sub-microgrid three interconnect.

The first alternating current sub-microgrid comprises a first alternating current bus, a first isolation transformer, a first AC/DC converter device, a first energy storage module and an energy storage converter, wherein the first alternating current bus is connected with the first alternating current bus I through the first transformer, the first alternating current bus is further connected with the direct current sub-microgrid through the energy storage converter, connected with the first energy storage module through the first AC/DC converter device and connected with the first isolation transformer.

The second alternating current sub-microgrid comprises a second alternating current bus, a third isolation transformer, a second AC/DC converter device, a second energy storage module and a third AC/DC converter device, the second alternating current bus is connected with the alternating current bus II through the second transformer, the second alternating current bus is further connected with the direct current sub-microgrid through the third AC/DC converter device, is connected with the second energy storage module through the second AC/DC converter device and is connected with the third isolation transformer.

And a communication switch is connected between the first alternating current bus and the second alternating current bus.

The direct current sub-microgrid comprises a direct current bus and a DC/DC conversion unit, the direct current bus is respectively connected with direct current output ends of the first alternating current sub-microgrid and the second alternating current sub-microgrid, and the DC/DC conversion unit block comprises one or more DC/DC conversion modules used for mounting part or all of a data center, a super capacitor, total station indoor lighting, a charging pile and photovoltaic on the direct current bus.

The direct-current sub-microgrid also comprises a fourth AC/DC converter device, the first alternating-current sub-microgrid also comprises a second isolation transformer, a direct-current side of the fourth AC/DC converter device provides a second path of redundant power supply for the data center, and an alternating-current side of the fourth AC/DC converter device is connected with a first alternating-current bus of the first alternating-current sub-microgrid through the second isolation transformer.

At least one of the alternating current bus I and the alternating current bus II is provided with an energy storage unit, the energy storage unit comprises an energy storage transformer, an AC/DC module and an energy storage module which are sequentially connected, and the energy storage module is a storage battery or a super capacitor.

The alternating current bus I is connected with an external high-voltage power supply, the alternating current bus II is connected with a station-entering alternating current high-voltage bus through a main transformer, and an interconnection switch is connected between the alternating current bus I and the alternating current bus II.

The first transformer and the second transformer are both energy storage bidirectional transformers.

The direct-current bus is a direct-current bus with a voltage level of 750V, the alternating-current bus I and the alternating-current bus II are alternating-current buses with a voltage level of 10KV, and the first alternating-current bus and the second alternating-current bus are AC400V buses.

Compared with the prior art, the invention has the following advantages: the invention comprises a first AC sub-microgrid, a second AC sub-microgrid, a first transformer, a second transformer, a DC sub-microgrid and two sections of AC buses, wherein the two sections of AC buses comprise an AC bus I and an AC bus II, the first AC sub-microgrid is connected with the AC bus I through the first transformer, the second AC sub-microgrid is connected with the AC bus II through the second transformer, the first AC sub-microgrid, the second AC sub-microgrid and the DC sub-microgrid are connected with each other, a topology structure of a 'two-AC-DC microgrid group' is formed through the structure, the energy intercommunication between the first AC sub-microgrid and the second AC sub-microgrid and the DC sub-intelligent microgrid can be realized through the topology structure of the 'two-AC-DC microgrid group', and the DC loads such as a data center of an energy source station, a super capacitor, a power station lighting system, a total station, a photovoltaic charging pile module and the like can be supplied with power or networked cleanly through the DC sub-microgrid, the energy loss caused by electric energy conversion in the station can be effectively reduced, the reliability of the power supply capacity of the total station is improved, meanwhile, the maximum utilization of clean energy in the station is realized, and the comprehensive benefit of the total station is improved.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Illustration of the drawings: 1. a first ac sub-microgrid; 11. a first isolation transformer; 12. a first AC/DC converter; 13. a first energy storage module; 14. an energy storage converter; 15. a second isolation transformer; 2. a second ac sub-microgrid; 21. a third isolation transformer; 22. a second AC/DC converter; 23. a second energy storage module; 24. a third AC/DC converter; 3. a first transformer; 4. a second transformer; 5. the direct current sub-microgrid; 51. a fourth AC/DC converter; 6. and an energy storage unit.

Detailed Description

As shown in fig. 1, the power supply system for the smart energy station of this embodiment includes a first AC microgrid 1, a second AC microgrid 2, a first transformer 3, a second transformer 4, a dc microgrid 5, and two AC buses, where the two AC buses include an AC bus I (marked as AC10KVI bus in the figure) and an AC bus II (marked as AC10KVII bus in the figure), the first AC microgrid 1 is connected to the AC bus I through the first transformer 3, the second AC microgrid 2 is connected to the AC bus II through the second transformer 4, and the first AC microgrid 1, the second AC microgrid 2, and the dc microgrid 5 are connected to each other. The topology structure of the two-way ac-dc microgrid groups is formed through the structure, energy intercommunication (energy bidirectional flow and load complementation) between the first ac microgrid 1 and the second ac microgrid 2 and the dc microgrid can be realized through the topology structure of the two-way ac microgrid groups, in-station clean energy is consumed on site through the dc microgrid 5 and the first ac microgrid 1, the second ac microgrid 2 is connected with the first ac microgrid 1 and serves as a standby power supply point of the dc microgrid 5, the dc microgrid 5 is enabled to form a double-end power supply, the requirement of load power consumption reliability is met, the power supply reliability is improved, the dc microgrid 5 can supply power or network for the dc loads such as a data center, a super capacitor, an indoor lighting system, a charging pile, a photovoltaic module and the like of the intelligent energy station, and in-station clean energy is consumed on site, the integration of power consumption system and microgrid system realizes that direct current system "an organic whole founds, integrative management and control", promotes the degree of fusion of each module in the station, and the energy storage and microgrid equipment are utilized to the maximize, can effectively reduce the energy loss that the electric energy conversion brought in the station, promotes the reliability of total powerstation power supply ability, realizes the clean energy maximize utilization in the station simultaneously, promotes the comprehensive benefit of total powerstation.

As shown in fig. 1, in this embodiment, the first AC sub-microgrid 1 includes a first AC bus, a first isolation transformer 11, a first AC/DC converter 12, a first energy storage module 13, and an energy storage converter 14, where the first AC bus is connected to the first AC bus I through the first transformer 3, the first AC bus is further connected to the DC sub-microgrid 5 through the energy storage converter 14, is connected to the first energy storage module 13 through the first AC/DC converter 12, and is connected to the first isolation transformer 11. Through the complementation of the AC load and the DC load of the energy storage converter 14, the clean energy (photovoltaic and the like) hung on the DC sub-microgrid 5 can be fully consumed.

As shown in fig. 1, in this embodiment, the second AC subgrid 2 includes a second AC bus, a third isolation transformer 21, a second AC/DC converter 22, a second energy storage module 23, and a third AC/DC converter 24, the second AC bus is connected to the AC bus II through the second transformer 4, the second AC bus is further connected to the DC subgrid 5 through the third AC/DC converter 24, the second energy storage module 23 through the second AC/DC converter 22, and the third isolation transformer 21. The second AC/DC converter 22 and the third AC/DC converter 24 of the second AC sub-microgrid 2 adopt unidirectional flowing modular AC/DC equipment, so that the DC sub-microgrid 5 forms a double-ended power supply, and it is ensured that important loads on the DC bus of the DC sub-microgrid 5 meet the reliability requirement.

As shown in fig. 1, in this embodiment, a tie switch is connected between the first ac bus and the second ac bus.

As shown in fig. 1, in the present embodiment, the DC sub-microgrid 5 includes a DC bus and a DC/DC conversion unit, the DC bus is respectively connected to the DC output terminals of the first ac sub-microgrid 1 and the second ac sub-microgrid 2, and the DC/DC conversion unit block includes one or more DC/DC conversion modules for mounting part or all of a data center, a super capacitor, total station indoor lighting, a charging pile, and a photovoltaic onto the DC bus. The DC sub-microgrid 5 adopts a double-end structure form, power supplies on two sides run in parallel, the power supply range is large, the power supply reliability is high, when any one end of the power supply fails, the power supply end on the other side can meet the power supply requirements of all loads, and the loads can acquire electric energy from different directions or output the electric energy to different directions through a power grid, a distributed power supply and energy storage. The IT equipment of the data center adopts a high-voltage direct-current power supply mode, an alternating-current and direct-current hybrid micro-grid formed by a first alternating-current sub micro-grid 1, a second alternating-current sub micro-grid 2 and a direct-current sub micro-grid 5 provides a double-path direct-current power supply, and meanwhile, the energy storage is multiplexed to be used as a backup power supply, a UPS power supply system and a backup diesel engine of the traditional data center are omitted, the power consumption of the IT equipment can be effectively reduced by using the power supply mode for the next time, and meanwhile, the heating power consumption caused by multiple DC-AC conversion of the UPS power supply is reduced. And the total station direct current load and the UPS are connected with a DC750V bus through DC/DC equipment. For the data center in the direct current sub-microgrid 5, two paths of power supplies are adopted for power supply, the other path of power supply is supplied by alternating current sub-microgrid AC/DC conversion, IT loads are evenly distributed on the two paths of power supplies in normal operation, under the condition that 1 power supply is lost, the other path of power supply can complete all load power supply, switching is not needed, and meanwhile, energy storage is multiplexed to serve as a backup power supply.

As shown in fig. 1, the direct current sub-microgrid 5 further includes a fourth AC/DC converter device 51, the first alternating current sub-microgrid 1 further includes a second isolation transformer 15, a direct current side of the fourth AC/DC converter device 51 provides a second path of redundant power for the data center, and an alternating current side of the fourth AC/DC converter device 51 is connected to the first alternating current bus of the first alternating current sub-microgrid 1 through the second isolation transformer 15.

As shown in fig. 1, at least one of the AC bus I and the AC bus II has an energy storage unit 6 (in this embodiment, the AC bus II), and the energy storage unit 6 includes an energy storage transformer, an AC/DC module, and an energy storage module, which are connected in sequence, and the energy storage module is a storage battery or a super capacitor.

As shown in fig. 1, an ac bus I is connected to an external high voltage power supply, an ac bus II is connected to an ac high voltage bus entering a station through a main transformer, and an interconnection switch is connected between the ac bus I and the ac bus II.

In this embodiment, the first transformer 3 and the second transformer 4 are both energy storage bidirectional transformers, and by integrating the conventional transformer and the energy storage bidirectional transformer, when the energy storage battery is charged at low power or is not charged or discharged, the energy storage bidirectional transformer is used as a transformer for a station, thereby improving the total station economy.

As shown in fig. 1, the dc bus is a dc bus with a voltage level of 750V, the AC bus I and the AC bus II are both AC buses with a voltage level of 10KV, and the first AC bus and the second AC bus are both AC400V buses.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.