Electrical wiring structure for electrochemical energy storage system station

Abstract

The utility model discloses a station electric wiring structure of an electrochemical energy storage system. The structure comprises a medium-voltage bus section A, a medium-voltage bus section B, a first energy storage system, a second energy storage system, an ATS and a station low-voltage bus section, the first energy storage system comprises a plurality of first step-up transformers and a first storage battery; high-voltage side windings of the first step-up transformers are connected with the medium-voltage bus section A; the second energy storage system comprises a plurality of second step-up transformers and a second storage battery; high-voltage side windings of the second step-up transformers are connected with the medium-voltage bus section B; one first boost transformer of the first energy storage system has one more low-voltage side winding than other first boost transformers and is connected to the ATS, one second boost transformer of the second energy storage system has one more low-voltage side winding than other second boost transformers and is connected to the ATS, and the two paths of power supplies are switched by the ATS and then are connected to a station low-voltage bus section. According to the electric wiring structure for the electrochemical energy storage system station, the construction cost is saved while the power supply reliability is ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of installation and wiring, specifically to a wiring structure for station power supply in an electrochemical energy storage system. Background Technology

[0002] The power supply configuration for electrochemical energy storage systems should be determined based on the power station's location, importance, and reliability requirements. Large-scale electrochemical energy storage power stations should preferably use dual-circuit power supply; medium and small-scale electrochemical energy storage power stations can use single-circuit power supply.

[0003] For electrochemical energy storage power stations, one or two independent station service transformers are typically configured to supply power to the low-voltage busbar section. These independent station service transformers draw power from the medium-voltage busbar section, reducing the voltage to 380 / 220V before supplying power to the low-voltage station loads. This wiring method increases the amount of equipment such as medium-voltage switchgear and station service transformers, thus increasing the overall cost and operating expenses. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the above-mentioned background technology and provide a power supply wiring structure for an electrochemical energy storage system station, which saves engineering costs while ensuring power supply reliability.

[0005] To achieve the above objectives, the present invention provides a station power connection structure for an electrochemical energy storage system, comprising two power sources consisting of a medium-voltage busbar A section and a medium-voltage busbar B section, as well as a first energy storage system, a second energy storage system, an ATS, and a station low-voltage busbar section.

[0006] The first energy storage system includes several first step-up transformers and a first battery. The first step-up transformer has a high-voltage side winding and a low-voltage side winding. The high-voltage side winding of the first step-up transformer is connected to section A of the medium-voltage busbar, and the low-voltage side winding of the first step-up transformer is connected to the first battery.

[0007] The second energy storage system includes several second step-up transformers and a second battery. The second step-up transformer has a high-voltage side winding and a low-voltage side winding. The high-voltage side winding of the second step-up transformer is connected to section B of the medium-voltage busbar, and the low-voltage side winding of the second step-up transformer is connected to the second battery.

[0008] One of the first step-up transformers in the first energy storage system has one more low-voltage side winding than the other first step-up transformers and is connected to the ATS. One of the second step-up transformers in the second energy storage system has one more low-voltage side winding than the other second step-up transformers and is connected to the ATS. The two power sources are connected to the station low-voltage bus section after being switched by the ATS.

[0009] In a preferred embodiment, the first energy storage system further includes a first PCS, through which the low-voltage side winding of the first step-up transformer is connected to the first battery.

[0010] In a preferred embodiment, the second energy storage system further includes a second PCS, through which the low-voltage side winding of the second step-up transformer is connected to the second battery.

[0011] In a preferred embodiment, the voltage levels of the medium-voltage busbar section A and the medium-voltage busbar section B are 10kV or 35kV.

[0012] In a preferred embodiment, the voltage level of the station low-voltage busbar section is 380V.

[0013] In a preferred embodiment, the first boost transformer is a two-winding transformer, a three-winding transformer, or a four-winding transformer.

[0014] In a preferred embodiment, the second boost transformer is a two-winding transformer, a three-winding transformer, or a four-winding transformer.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] Firstly, the electrical wiring structure of this utility model is designed for the wiring characteristics of the station power supply of electrochemical energy storage stations. It uses an improved step-up transformer for the energy storage system to replace the existing station power supply transformer, which simplifies the wiring of the station power supply of the electrochemical energy storage system and makes operation and maintenance more convenient.

[0017] Secondly, the electrochemical energy storage system station power wiring structure of this utility model saves the cost of at least two medium-voltage switchgear cabinets and two station power transformers, thus reducing the project cost.

[0018] Thirdly, the power supply wiring structure of the electrochemical energy storage system of this utility model adopts dual power supply with automatic switching and mutual backup, ensuring the reliability of power supply. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the power supply wiring structure of the electrochemical energy storage system in the first embodiment of this utility model;

[0020] Figure 2 This is a schematic diagram of the power supply wiring structure of the electrochemical energy storage system in the second embodiment of this utility model;

[0021] In the diagram, 1-Medium-voltage busbar section A, 2-Medium-voltage busbar section B, 3-First energy storage system, 301-First step-up transformer, 302-First battery, 303-First PCS, 4-Second energy storage system, 401-Second step-up transformer, 402-Second battery, 403-Second PCS, 5-ATS, 6-Station low-voltage busbar section. Detailed Implementation

[0022] To facilitate understanding by those skilled in the art, the present invention will be further described in detail below with reference to specific embodiments. However, those skilled in the art will understand that the following embodiments are only some, not all, of the present invention, and are used only to illustrate the present invention, and should not be considered as limiting the scope of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] When a component is described as being "set on" another component, it can be directly on the other component or it can be in an intervening component. "Set on" indicates a mode of existence, which can be a connection, installation, fixed connection, active connection, etc. When a component is described as being "connected" to another component, it can be directly connected to the other component or it may be in an intervening component.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] like Figure 1 As shown, the electrochemical energy storage system station power connection structure of the first embodiment of this utility model includes two power supplies consisting of medium-voltage bus section A 1 and medium-voltage bus section B 2, as well as a first energy storage system 3, a second energy storage system 4, an ATS 5 (ATS stands for automatic transfer switch), and a station low-voltage bus section 6. In this embodiment, the voltage levels of medium-voltage bus section A 1 and medium-voltage bus section B 2 are 10kV or 35kV; the voltage level of station low-voltage bus section 6 is 380V. The first energy storage system 3 includes several first step-up transformers 301, first batteries 302, and first PCS 303 (PCS stands for power conversion system, energy storage converter). The first step-up transformers 301 have high-voltage side windings and low-voltage side windings. The high-voltage side windings of the first step-up transformers 301 are connected to the medium-voltage bus section A 1, and the low-voltage side windings of the first step-up transformers 301 are connected to the first batteries 302 through the first PCS 303.

[0026] The second energy storage system 4 includes several second step-up transformers 401, second batteries 402, and second PCS 403. The second step-up transformers 401 have high-voltage side windings and low-voltage side windings. The high-voltage side windings of the second step-up transformers 401 are connected to the medium-voltage busbar section B 2, and the low-voltage side windings of the second step-up transformers 401, the second PCS 403, are connected to the second batteries 402.

[0027] One of the first step-up transformers 301 in the first energy storage system 3 has one more low-voltage side winding than the other first step-up transformers 301 and is connected to ATS5. One of the second step-up transformers 401 in the second energy storage system 4 has one more low-voltage side winding than the other second step-up transformers 401 and is connected to ATS5. The two power sources are connected to the station's low-voltage bus section 6 after being switched via ATS5. ATS is an automatic transfer switch that automatically switches to the other power source when one power source loses power.

[0028] The first step-up transformer 301 can be a two-winding, three-winding, or four-winding transformer, or other wiring configurations. The second step-up transformer 401 can also be a two-winding, three-winding, or four-winding transformer, or other wiring configurations. The wiring configurations of the first step-up transformer 301 and the second step-up transformer 401 connected to the ATS5 can be varied. If other step-up transformers are two-winding transformers, the step-up transformer used for station power supply becomes a three-winding transformer after adding a low-voltage side winding; if other step-up transformers are three-winding transformers, the step-up transformer used for station power supply becomes a four-winding transformer after adding a low-voltage side winding. In this embodiment, the first step-up transformer 301 and the second step-up transformer 401 connected to the ATS are three-winding transformers, while other step-up transformers are two-winding transformers.

[0029] like Figure 2 As shown, the second embodiment of the electrochemical energy storage system's station power connection structure differs from the first embodiment in that the first step-up transformer 301 and the second step-up transformer 401 connected to the ATS are four-winding transformers, while the other step-up transformers are three-winding transformers. One of the first step-up transformers 301 in the first energy storage system 3 has one more low-voltage side winding connected to the ATS 5 than the other first step-up transformers 301, and one of the second step-up transformers 401 in the second energy storage system 4 has one more low-voltage side winding connected to the ATS 5 than the other second step-up transformers 401. The two power supplies are connected to the station low-voltage busbar section 6 after being switched by the ATS 5.

[0030] The above are merely specific embodiments of this utility model. It should be noted that any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. All other aspects not described in detail belong to the prior art.

Claims

1. A power supply wiring structure for an electrochemical energy storage system, comprising two power sources consisting of a medium-voltage busbar section A (1) and a medium-voltage busbar section B (2), characterized in that: It also includes the first energy storage system (3), the second energy storage system (4), the ATS (5), and the station service low-voltage bus section (6); The first energy storage system (3) includes several first step-up transformers (301) and first batteries (302). The first step-up transformers (301) have high-voltage side windings and low-voltage side windings. The high-voltage side windings of the first step-up transformers (301) are connected to the medium-voltage bus section A (1), and the low-voltage side windings of the first step-up transformers (301) are connected to the first batteries (302). The second energy storage system (4) includes several second step-up transformers (401) and a second battery (402). The second step-up transformer (401) has a high-voltage side winding and a low-voltage side winding. The high-voltage side winding of the second step-up transformer (401) is connected to the medium-voltage bus section B (2), and the low-voltage side winding of the second step-up transformer (401) is connected to the second battery (402). One of the first step-up transformers (301) of the first energy storage system (3) has one more low-voltage side winding than the other first step-up transformers (301) and is connected to the ATS (5). One of the second step-up transformers (401) of the second energy storage system (4) has one more low-voltage side winding than the other second step-up transformers (401) and is connected to the ATS (5). The two power supplies are connected to the station low-voltage bus section (6) after being switched by the ATS (5).

2. The power supply wiring structure for the electrochemical energy storage system according to claim 1, characterized in that: The first energy storage system (3) also includes a first PCS (303), and the low-voltage side winding of the first step-up transformer (301) is connected to the first battery (302) through the first PCS (303).

3. The power supply wiring structure for the electrochemical energy storage system according to claim 2, characterized in that: The second energy storage system (4) also includes a second PCS (403), and the low-voltage side winding of the second step-up transformer (401) is connected to the second battery (402) through the second PCS (403).

4. The power supply wiring structure for an electrochemical energy storage system according to claim 1, 2, or 3, characterized in that: The voltage levels of the medium-voltage busbar section A (1) and medium-voltage busbar section B (2) are 10kV or 35kV.

5. The power supply wiring structure for an electrochemical energy storage system according to claim 1, 2, or 3, characterized in that: The voltage level of the station low-voltage busbar section (6) is 380V.

6. The power supply wiring structure for an electrochemical energy storage system according to claim 1, 2, or 3, characterized in that: The first step-up transformer (301) is a two-winding transformer, a three-winding transformer, or a four-winding transformer.

7. The power supply wiring structure for an electrochemical energy storage system according to claim 1, 2, or 3, characterized in that: The second step-up transformer (401) is a two-winding transformer, a three-winding transformer, or a four-winding transformer.

Images