Large-scale wind and light distributed distribution and storage system

Abstract

The utility model provides a large-scale wind and light distributed distribution and storage system, which relates to the technical field of wind and light storage systems, and mainly comprises a boost access part, a wind and light storage system boost station, a photovoltaic system collection switch cabinet and a wind power system collection switch cabinet, the photovoltaic power generation part comprises a photovoltaic box-type boost transformer, a photovoltaic converter and a photovoltaic power generation unit; the wind power generation part comprises a wind power box type boost transformer, a wind power converter and a wind power generation unit; the energy storage device part comprises an energy storage converter and an energy storage battery; and an energy management system. The energy storage devices are dispersedly arranged near the wind-light box type step-up transformer, so that the energy storage devices and the wind-light power generation unit can be accessed at the low-voltage alternating current side of the wind-light box type step-up transformer together, the peak surplus electric quantity of a wind-light system can be consumed nearby, and the fluctuation of the system can be smoothed; the system investment is reduced, and the overall efficiency of energy storage is also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wind-solar-storage systems, and in particular to a large-scale wind-solar distributed storage system. Background Art

[0002] In recent years, with the continuous growth of photovoltaic and wind power installed capacity, the problem of wind and solar power curtailment caused by grid absorption has become increasingly prominent, and has also become the biggest obstacle to the development of new energy power generation projects. Therefore, the storage capacity of electricity through energy storage devices can effectively solve the problem of wind and solar power curtailment. Combined with wind power and photovoltaics, it can achieve peak shaving and valley filling and smooth the output power curve, thereby greatly reducing the pressure on the stable operation of the power grid, improving the quality of electricity, and optimizing the absorption of new energy.

[0003] Currently, large-scale wind and solar power projects all utilize generator-side energy storage. This involves centrally deploying energy storage devices on the grid-connected power generation side to store excess electricity generated by renewable energy sources such as wind and solar during peak periods. This storage device is then connected to the grid in parallel with the wind and solar power generation system. Based on grid dispatch, peak load shifting and valley filling are performed on the AC output side, smoothing wind and solar power generation and tracking the planned output curve. This centralized energy storage system primarily consists of energy storage batteries, energy storage converters, box-type step-up transformers, and energy management systems. Due to the multiple AC / DC and step-up / step-down conversions involved in the charging and discharging process, the overall efficiency of centralized energy storage systems is relatively low.

[0004] Centralized energy storage systems are typically located near wind and solar power system booster stations, which can significantly impact the overall system safety in the event of a fire or other safety incident. Furthermore, when equipment related to the energy storage system fails, the entire system typically needs to be shut down for inspection and maintenance.

[0005] Therefore, we provide a large-scale wind and solar distributed storage system to solve the above problems. Utility Model Content

[0006] The purpose of the present invention is to provide a large-scale wind-solar distributed storage system to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a large-scale wind-solar distributed distribution storage system, including a boosting access part: including a wind-solar storage system boosting station, a photovoltaic system collection switch cabinet, and a wind power system collection switch cabinet; a photovoltaic power generation part: including a photovoltaic box-type booster transformer, a photovoltaic converter, and a photovoltaic power generation unit; a wind power generation part: including a wind power box-type booster transformer, a wind power converter, and a wind power generation unit; an energy storage device part: including an energy storage converter and an energy storage battery; and an energy management system.

[0008] Preferably, the energy storage device part is arranged near part of the photovoltaic power generation part or the wind power generation part according to the capacity dispersion. The energy storage device part and the photovoltaic power generation unit or the wind power generation unit are connected in parallel on the AC low-voltage side of the photovoltaic box-type boost transformer or the wind power box-type boost transformer. After being boosted by the photovoltaic box-type boost transformer or the wind power box-type boost transformer, they are connected to the photovoltaic system collection switch cabinet or the wind power system collection switch cabinet, and then connected to the power grid after being boosted by the wind-solar system boost station. The energy management system is communicated with the boost access part, the photovoltaic power generation part, the wind power generation part, and the energy storage device part, and issues relevant control instructions.

[0009] Preferably, the photovoltaic power generation unit inverts direct current into alternating current for output via a photovoltaic converter.

[0010] Preferably, the wind power generation unit inverts direct current into alternating current for output via a wind power converter.

[0011] Preferably, part of the energy storage battery of the energy storage device inverts the stored peak-loaded wind and solar DC power into AC power through an energy storage converter, wherein the AC voltage range of the energy storage converter is 800-1500V.

[0012] Preferably, the energy management system adjusts the charging power of each energy storage converter in the energy storage device part in real time according to the total power of all power generation units of the wind and solar power system, so that the excess electricity of the wind and solar power generation parts that are decentralized connected to the energy storage device part is first charged into the energy storage system, and the other wind and solar power generation parts that are not connected to the energy storage device part are first connected to the grid to reduce system losses.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] Distributing energy storage devices near wind-solar box-type step-up transformers allows for simultaneous access of both the energy storage devices and wind-solar power generation units on the low-voltage AC side of the wind-solar box-type step-up transformer. This allows for the local absorption of excess power during peak wind-solar system loads, reducing intermediate transmission and distribution links, minimizing losses, and smoothing system fluctuations. Furthermore, direct grid connection via wind-solar box-type step-up transformers reduces system investment and improves overall efficiency during energy storage. Furthermore, the distributed deployment of energy storage devices effectively prevents and mitigates safety risks such as fires. Furthermore, when some equipment fails, there is no need to shut down the entire system for repair, thereby improving the utilization rate of the energy storage devices and the stability of system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a system schematic diagram of the present utility model.

[0016] Numbers in the figure: 1. Wind-solar-storage system booster station; 2. Photovoltaic system collection switch cabinet; 3. Wind power system collection switch cabinet; 4. Photovoltaic box-type booster transformer; 5. Photovoltaic converter; 6. Photovoltaic power generation unit; 7. Wind power box-type booster transformer; 8. Wind power converter; 9. Wind power generation unit; 10. Energy storage converter; 11. Energy storage battery; 12. Energy management system. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] Example 1

[0019] See also Figure 1 As shown, the utility model provides a technical solution: a large-scale wind-solar distributed distribution storage system, to achieve the above purpose, including mainly composed of a boost access part: including a wind-solar storage system boost station 1, a photovoltaic system collection switch cabinet 2, and a wind power system collection switch cabinet 3; a photovoltaic power generation part: including a photovoltaic box-type boost transformer 4, a photovoltaic converter 5, and a photovoltaic power generation unit 6; a wind power generation part: including a wind power box-type boost transformer 7, a wind power converter 8, and a wind power generation unit 9; an energy storage device part: including an energy storage converter 10, an energy storage battery 11; and an energy management system 12.

[0020] Furthermore, the energy storage device part is arranged near part of the photovoltaic power generation part or the wind power generation part according to the capacity dispersion. The energy storage device part and the photovoltaic power generation unit 6 or the wind power generation unit 9 are connected in parallel on the AC low-voltage side of the photovoltaic box-type boost transformer 4 or the wind power box-type boost transformer 7. After being boosted by the photovoltaic box-type boost transformer 4 or the wind power box-type boost transformer 7, it is connected to the photovoltaic system collection switch cabinet 2 or the wind power system collection switch cabinet 3, and then connected to the power grid after being boosted by the wind-solar system boost station. The energy management system 12 is communicated with the boost access part, the photovoltaic power generation part, the wind power generation part, and the energy storage device part, and issues relevant control instructions.

[0021] Furthermore, the photovoltaic power generation unit 6 inverts the direct current into alternating current for output through the photovoltaic converter 5. By cooperating with the photovoltaic power generation unit 6 and the photovoltaic converter 5, direct current can be inverted into alternating current, which is more consistent with the desired effect.

[0022] Furthermore, the wind power generation unit 9 inverts the DC power into AC power output through the wind power converter 8. Through the cooperation between the wind power generation unit 9 and the wind power converter 8, the DC power can be inverted into AC power, which can be more consistent with the desired effect.

[0023] Furthermore, the energy storage device's partial energy storage battery 11 inverts the stored peak-loaded wind and solar DC power into AC power through the energy storage converter 10, wherein the AC voltage range of the energy storage converter 10 is 800-1500V.

[0024] Furthermore, the energy management system 12 adjusts the charging power of each energy storage converter 10 of the energy storage device in real time according to the total power of all power generation units of the wind and solar power system, so that the excess power of the wind and solar power generation parts that are distributedly connected to the energy storage device part is first charged into the energy storage system, and the other wind and solar power generation parts that are not connected to the energy storage device part are given priority to be connected to the grid to reduce system losses.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large-scale wind-solar distributed storage system, characterized in that: The system mainly comprises a voltage-boosting access part, including a wind-solar-storage system voltage-boosting station (1), a photovoltaic system collection switch cabinet (2), and a wind power system collection switch cabinet (3); a photovoltaic power generation part, including a photovoltaic box-type voltage-boosting transformer (4), a photovoltaic converter (5), and a photovoltaic power generation unit (6); a wind power generation part, including a wind power box-type voltage-boosting transformer (7), a wind power converter (8), and a wind power generation unit (9); an energy storage device part, including an energy storage converter (10) and an energy storage battery (11); and an energy management system (12).

2. A large-scale wind-solar distributed storage system according to claim 1, characterized in that: The energy storage device part is arranged near part of the photovoltaic power generation part or the wind power generation part according to the dispersed capacity. The energy storage device part and the photovoltaic power generation unit (6) or the wind power generation unit (9) are connected in parallel on the AC low-voltage side of the photovoltaic box-type boost transformer (4) or the wind power box-type boost transformer (7). After being boosted by the photovoltaic box-type boost transformer (4) or the wind power box-type boost transformer (7), the energy storage device part is connected to the photovoltaic system collection switch cabinet (2) or the wind power system collection switch cabinet (3). After being boosted by the wind-solar system boost station, the energy storage device part is connected to the power grid. The energy management system (12) is connected to the boost access part, the photovoltaic power generation part, the wind power generation part, and the energy storage device part, and issues relevant control instructions.

3. A large-scale wind-solar distributed storage system according to claim 1, characterized in that: The photovoltaic power generation unit (6) inverts direct current into alternating current through a photovoltaic converter (5) for output.

4. A large-scale wind-solar distributed storage system according to claim 1, characterized in that: The wind power generation unit (9) inverts direct current into alternating current for output via a wind power converter (8).

5. The large-scale wind-solar distributed storage system according to claim 1 is characterized in that: The energy storage device part energy storage battery (11) converts the stored peak multi-generation wind and solar direct current into alternating current through the energy storage converter (10), wherein the AC voltage range of the energy storage converter (10) is 800-1500V.

6. A large-scale wind-solar distributed storage system according to claim 1, characterized in that: The energy management system (12) adjusts the charging power of each energy storage converter (10) of the energy storage device in real time according to the total power of all power generation units of the wind and solar power system, so that the excess power of the wind and solar power generation parts that are distributedly connected to the energy storage device part is first charged into the energy storage system, and the other wind and solar power generation parts that are not connected to the energy storage device part are first connected to the grid to reduce system losses.

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