Self-powered power supply system suitable for large-scale energy storage power station

Abstract

A self-power-consumption power supply system suitable for a large energy storage power station comprises a low-voltage station power-consumption bus power distribution cabinet installed in a booster station power distribution room, the low-voltage station power-consumption bus power distribution cabinet is connected with at least one energy storage system local distribution box, and the energy storage system local distribution box is arranged on the ground of an energy storage area. The energy storage system local distribution box is connected with at least one dual-power-supply change-over switch, and one path of the dual-power-supply change-over switch is connected with an auxiliary transformer of the energy storage PCS and used as a normal power supply. The other path of the dual-power change-over switch is connected with a station power distribution box to serve as a standby power supply; and the dual-power change-over switch is positioned on the energy storage PCS equipment. According to the utility model, an affiliated transformer of energy storage PCS equipment is used as a main power supply, and electricity of a low-voltage station of an energy storage power station is used as a standby power supply. Wherein the standby power supply is reasonably provided with an on-site distribution box and a looped network circuit breaker box according to equipment arrangement and equipment grouping of the energy storage power station, so that the stability of self power utilization of the energy storage power station can be effectively ensured, and the workload of equipment and field installation is saved.

Description

Technical Field

[0001] The utility model relates to a self-use power supply system suitable for a large energy storage power station, which can be used for a self-use power distribution system of a large energy storage power station. Background Art

[0002] The energy storage equipment of large and medium-sized energy storage power stations requires two reliable power supplies for backup. The traditional solution of self-use backup power supply generally adopts a dedicated 35kV step-down transformer for power supply. The dedicated transformer equipment is relatively expensive and occupies a large area. The ancillary equipment increases the area of ​​the station's power distribution room, which has a great impact on the overall cost of the project. Utility Model Content

[0003] The technical problem to be solved by the utility model is: how to ensure the reliability of self-use electricity in a large energy storage power station without setting up a dedicated 35kV step-down transformer. Therefore, the utility model proposes a low-voltage power distribution design based on a hybrid of trunk type and radial type.

[0004] The technical solution of the utility model is specifically as follows:

[0005] A self-power supply system suitable for a large energy storage power station, comprising a low-voltage station power bus distribution cabinet installed in a booster station distribution room, the low-voltage station power bus distribution cabinet connected to at least one local distribution box of an energy storage system, the local distribution box of the energy storage system is arranged on the ground of an energy storage area, the local distribution box of the energy storage system is connected to at least one dual power conversion switch, one path of the dual power conversion switch is connected to an auxiliary transformer of the energy storage PCS as a normal power supply; the other path of the dual power conversion switch is connected to the station power distribution box as a backup power supply; the dual power conversion switch is located at the energy storage PCS equipment.

[0006] The dual power conversion switches in different energy storage PCS devices are connected by a ring network circuit breaker box.

[0007] The two power supplies of the dual power transfer switch are switched through the ATS automatic transfer switch.

[0008] The beneficial effects of the utility model are as follows: It has the following advantages: The utility model proposes a design scheme for self-power supply of energy storage equipment suitable for large energy storage power stations, using the auxiliary transformer of the energy storage PCS equipment as the main power supply, and the low-voltage station power supply of the energy storage power station as the backup power supply. Among them, the backup power supply reasonably sets the local distribution box and the ring network circuit breaker box according to the equipment layout and equipment grouping of the energy storage power station, which can effectively ensure the stability of the self-power supply of the energy storage power station, save equipment and on-site installation workload, and is particularly suitable for large-scale centralized energy storage projects above 100MWh.

[0009] The utility model does not need to set up a dedicated energy storage step-down transformer, and under the premise of not affecting safe operation, it effectively reduces the initial equipment investment of the project and reduces the workload of later operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the overall principle diagram of the utility model. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0012] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0013] like Figure 1 As shown, a self-power supply system suitable for a large energy storage power station includes a low-voltage station power bus distribution cabinet 1 installed in the power distribution room of the booster station, the low-voltage station power bus distribution cabinet 1 is connected to at least one local distribution box 2 of the energy storage system, the local distribution box 2 of the energy storage system is arranged on the ground of the energy storage area, the local distribution box 2 of the energy storage system is connected to at least one dual power conversion switch 3, the dual power conversion switch 3 is connected to the auxiliary transformer of the energy storage PCS as a normal power supply; the other way of the dual power conversion switch 3 is connected to the station power distribution box as a backup power supply.

[0014] It should be noted that the dual power conversion switch 3 is located in the energy storage PCS device.

[0015] Furthermore, the dual power conversion switches 3 in different energy storage PCS devices are connected by a ring network circuit breaker box 4 .

[0016] Furthermore, the two power supplies of the dual power conversion switch 3 are switched through an ATS automatic conversion switch.

[0017] The working principle of the utility model is:

[0018] When the energy storage system is working normally, the low-voltage working power supply is taken from the auxiliary transformer of the energy storage PCS. The low-voltage station power bus distribution cabinet 1 is led to the local distribution box 2 of the energy storage system through the main cable. The local distribution box 2 of the energy storage system is led to the dual power conversion switch 3 in the energy storage system by the branch cable. The ring network circuit breaker box 4 is used to communicate between different energy storage PCS devices. When the auxiliary transformer of the energy storage PCS system fails or the battery of the energy storage system is exhausted, it will automatically switch to the station power supply to meet the safety operation requirements. It should be noted that the local distribution box 2 of the energy storage system and the ring network circuit breaker box 4 are set according to the layout and grouping of the energy storage system. Different switches control different energy storage strings, which can effectively save cables and reduce the scope of faults.

[0019] Promotion and application prospects:

[0020] The utility model is suitable for the self-power supply system of energy storage equipment in large-scale energy storage power stations. By reasonably setting up local distribution boxes and ring network junction boxes, the low-voltage station electricity can be used as a reliable backup power supply for the energy storage system, reducing the need to set up a dedicated 35kV step-down transformer and related ancillary facilities, effectively reducing project investment without affecting operational safety, and has strong promotion value.

[0021] Expected benefits:

[0022] After adopting the design of this utility model, the energy storage project can reduce 35kV step-down transformers, switch cabinets and corresponding high-voltage cable equipment, and add a small amount of low-voltage distribution switches and cables. It is estimated that every 100MWh energy storage equipment can save about 300,000 yuan in investment.

[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. A self-power supply system suitable for a large energy storage power station, characterized in that: The invention comprises a low-voltage station power bus distribution cabinet (1) installed in a power distribution room of a booster station, wherein the low-voltage station power bus distribution cabinet (1) is connected to at least one local distribution box (2) of an energy storage system, wherein the local distribution box (2) of the energy storage system is arranged on the ground of an energy storage area, and the local distribution box (2) of the energy storage system is connected to at least one dual power conversion switch (3), wherein one path of the dual power conversion switch (3) is connected to an auxiliary transformer provided by the energy storage PCS as a normal power source; the other path of the dual power conversion switch (3) is connected to the station power distribution box as a backup power source; and the dual power conversion switch (3) is located on the energy storage PCS equipment.

2. According to claim 1, a self-power supply system suitable for a large energy storage power station is characterized in that: The dual power conversion switches (3) in different energy storage PCS devices are connected by a ring network circuit breaker box (4).

3. The self-power supply system suitable for a large energy storage power station according to claim 1, characterized in that: The two power supplies of the dual power conversion switch (3) are switched via an ATS automatic conversion switch.

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