Distributed energy storage power supply system

Abstract

The utility model provides a distributed energy storage power supply system, which relates to the technical field of energy storage and comprises a medium-voltage power supply bus electrically connected with a power supply and a metering device; the low-voltage power supply bus and the medium-voltage power supply bus are electrically connected with a first low-voltage bus and a second low-voltage bus respectively through a step-down transformer, the first low-voltage bus is electrically connected with an energy storage system through a first switch, the second low-voltage bus is electrically connected with a load through a second switch, and the first low-voltage bus is electrically connected with the second low-voltage bus through a third switch; the metering device and the energy storage system are both electrically connected with the control module, and the control module controls on-off of the third switch according to the metering device. The control module obtains electric quantity information according to the metering device and controls on-off of the three switches, so that the power supply bus supplies power to loads such as a dust removal subsystem or the energy storage system supplies power to the loads, and the situation that the loads cannot work when the power supply bus breaks down is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and particularly relates to a distributed energy storage power supply system. Background Art

[0002] The distributed dust removal system is a brand-new dust removal system applicable to intermittent process scenarios such as multi-point material transportation, batching, and multi-point flue gas. It consists of multiple dust removal subsystems. The design of each dust removal subsystem highly matches the characteristics of the process production. Next to the process equipment, the number of equipment and dust removal points in the dust removal subsystem is greatly reduced, realizing true real-time synchronization between the dust removal unit and the production process, greatly improving the energy utilization efficiency, and reducing the total dust emission. It has the characteristics of "centralized management, decentralized control" and "decentralized treatment, centralized emission", overcoming the problems that it is difficult to match centralized dust removal with process production and the imbalance between environmental protection dust removal and power supply.

[0003] To ensure the safe production of large industrial enterprises, the power supply equipment of the dust removal system usually adopts dual-loop power supply. When any one loop fails and stops power supply, the other loop can be immediately put into operation and bear all the loads of the dust removal system, thereby reducing the probability of abnormal power supply in industrial production. However, there are also a small number of enterprises that adopt a single-loop power supply mode, increasing the probability of abnormal power supply in the dust removal system. However, in the actual production process, when special situations occur, resulting in abnormal single-loop power supply or both power supply loops failing, the dust removal system will lose power and cannot work, causing the production system to stop completely, posing certain potential safety hazards. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is that when both power supply loops fail, the dust removal system loses power and cannot work. To overcome the above defects of the prior art, the utility model provides a distributed energy storage power supply system.

[0005] The utility model provides a distributed energy storage power supply system, including:

[0006] A medium-voltage power supply busbar, the power supply side of the medium-voltage power supply busbar is electrically connected to a power supply, and the power receiving side of the medium-voltage power supply busbar is electrically connected to a metering device;

[0007] A low-voltage power supply busbar, the power receiving side of the medium-voltage power supply busbar is also electrically connected to the power supply sides of a low-voltage first busbar and a low-voltage second busbar respectively through a step-down transformer. The power receiving side of the low-voltage first busbar is electrically connected to an energy storage system through a first switch, the power receiving side of the low-voltage second busbar is electrically connected to a load through a second switch, and the low-voltage first busbar is electrically connected to the low-voltage second busbar through a third switch;

[0008] A control module, both the metering device and the energy storage system are electrically connected to the control module, and the control module controls the on / off of the third switch according to the metering device.

[0009] Compared with the prior art, the distributed energy storage power supply system of the present application has the following advantages: The control module can control the on / off of the first switch, the second switch, and the third switch according to the power quantity information measured by the metering device, so as to realize power supply to loads such as the dust removal subsystem through the power supply bus, or power supply to the load by the energy storage system, and avoid the load from being powered off and unable to work when the power supply bus fails.

[0010] In a possible implementation manner, the medium-voltage power supply bus includes a medium-voltage first power supply bus and a medium-voltage second power supply bus; the power supply side of the medium-voltage first power supply bus is electrically connected to the power supply through a vacuum circuit breaker QF1, and the power receiving side of the medium-voltage first power supply bus is electrically connected to the power supply side of the low-voltage first bus through a series of vacuum circuit breaker QF4 and a first step-down transformer; the power supply side of the medium-voltage second power supply bus is electrically connected to the power supply through a vacuum circuit breaker QF2, and the power receiving side of the medium-voltage second power supply bus is electrically connected to the power supply side of the low-voltage second bus through a series of vacuum circuit breaker QF5 and a second step-down transformer; the medium-voltage first power supply bus is electrically connected to the medium-voltage second power supply bus through a vacuum circuit breaker QF3, and the power receiving sides of the medium-voltage first power supply bus and the medium-voltage second power supply bus are respectively electrically connected to a metering device, and the control terminals of the vacuum circuit breaker QF1, the vacuum circuit breaker QF2, the vacuum circuit breaker QF3, the vacuum circuit breaker QF4, and the vacuum circuit breaker QF5 are all electrically connected to the control module.

[0011] Compared with the prior art, by setting two medium-voltage power supply buses, it is prevented that one way is damaged and power outage occurs and it cannot be used; at the same time, by setting vacuum circuit breakers, it is convenient to control the on / off of each path.

[0012] In a possible implementation manner, the power receiving side of the low-voltage first bus is respectively electrically connected to an energy storage system through a vacuum circuit breaker QF6, and the control terminal of the vacuum circuit breaker QF6 is electrically connected to the control module.

[0013] Compared with the prior art, each energy storage system has a vacuum circuit breaker QF6 to realize on / off, which is convenient to charge a single or multiple energy storage systems, and is also convenient to adjust the number of energy storage systems discharging.

[0014] In a possible implementation manner, the power receiving side of the low-voltage second bus is respectively electrically connected to a load through a vacuum circuit breaker QF8, and the control terminal of the vacuum circuit breaker QF8 is electrically connected to the control module.

[0015] Compared with the prior art, by setting the vacuum circuit breaker QF8 to achieve on-off, it is convenient to control the operation of single or multiple loads.

[0016] In a possible implementation manner, the third switch is a vacuum circuit breaker QF7, and the control end of the vacuum circuit breaker QF7 is electrically connected to the control module.

[0017] Compared with the prior art, using a vacuum circuit breaker as the third switch facilitates the control module to achieve disconnection or closure through electric control.

[0018] In a possible implementation manner, the power supply side of the medium-voltage power supply bus is electrically connected to the power supply through the vacuum circuit breaker QF, the power receiving side of the medium-voltage power supply bus is electrically connected to the power supply end of the low-voltage power supply bus through a step-down transformer, the power receiving side of the low-voltage power supply bus is electrically connected to the power supply side of the low-voltage first bus through the vacuum circuit breaker QF41, and the power receiving side of the low-voltage first bus is respectively electrically connected to an energy storage system through a vacuum circuit breaker QF6; the power receiving side of the low-voltage power supply bus is also electrically connected to the power supply side of the low-voltage second bus through the vacuum circuit breaker QF51, and the power receiving side of the low-voltage second bus is respectively electrically connected to a load through a vacuum circuit breaker QF8; the low-voltage first bus is electrically connected to the low-voltage second bus through the vacuum circuit breaker QF7, and the control ends of the vacuum circuit breaker QF, the vacuum circuit breaker QF41, the vacuum circuit breaker QF51, the vacuum circuit breaker QF6, the vacuum circuit breaker QF7, and the vacuum circuit breaker QF8 are all electrically connected to the control module.

[0019] Compared with the prior art, when using a single medium-voltage power supply bus, the vacuum circuit breaker QF41 and the vacuum circuit breaker QF51 are used to divide the power supply into two independent low-voltage buses, ensuring that the power supply for the energy storage system and the load is separated and guaranteeing two-way power supply.

[0020] In a possible implementation manner, the load includes a dust removal subsystem and electrical equipment. The power receiving side of the low-voltage second bus is electrically connected to the dust removal subsystem, and the dust removal subsystem is electrically connected to the electrical equipment.

[0021] In a possible implementation manner, the total capacity of the energy storage system is greater than or equal to the maximum operating load power of the dust removal subsystem.

[0022] In a possible implementation manner, the energy storage system is also electrically connected to a photovoltaic power generation system.

[0023] Compared with the prior art, the dust removal subsystem is installed indoors, and a photovoltaic power generation system is installed on the roof. By electrically connecting the photovoltaic power generation system, it is possible to further supply power to the energy storage power supply system, increase the source of electrical energy acquisition, and prevent power outages.

[0024] In a possible implementation manner, the power supply voltage on the medium-voltage power supply bus is 10 kV or 6 kV, and the power supply voltage on the low-voltage power supply bus is 400 V. Description of the Drawings

[0025] Figure 1 FIG. 1 is a circuit diagram of the first embodiment of a distributed energy storage power supply system of the present utility model;

[0026] Figure 2 FIG. 2 is a circuit diagram of the second embodiment of a distributed energy storage power supply system of the present utility model.

[0027] Description of the Reference Numerals:

[0028] 1 - Medium-voltage power supply bus; 11 - First medium-voltage power supply bus; 12 - Second medium-voltage power supply bus;

[0029] 2 - Low-voltage power supply bus; 21 - First low-voltage bus; 22 - Second low-voltage bus;

[0030] 3 - Control module;

[0031] 4 - Metering device;

[0032] 51 - First switch; 52 - Second switch; 53 - Third switch;

[0033] 6 - Energy storage system;

[0034] 7 - Step-down transformer; 71 - First step-down transformer; 72 - Second step-down transformer;

[0035] 8 - Load;

[0036] 9 - Photovoltaic power generation system. Detailed Embodiments

[0037] First of all, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0038] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0039] The present application will be further described in detail below with reference to the drawings and specific embodiments.

[0040] The distributed dust removal is a new type of dust removal system in which the production process is closely combined with the dust removal system. The distributed dust removal system consists of multiple dust removal subsystems and operates synchronously with the process production, featuring "centralized management, decentralized control" and "decentralized treatment, centralized emission".

[0041] See Figure 1 As shown, the embodiment of the present application discloses a distributed energy storage power supply system, including:

[0042] A medium-voltage power supply bus 1, the power supply side of the medium-voltage power supply bus 1 is electrically connected to a power supply, and the power receiving side of the medium-voltage power supply bus 1 is electrically connected to a metering device 4;

[0043] A low-voltage power supply bus 2, the power receiving side of the medium-voltage power supply bus 1 is also electrically connected to the power supply sides of a low-voltage first bus 21 and a low-voltage second bus 22 through a step-down transformer 7 respectively. The power receiving side of the low-voltage first bus 21 is electrically connected to an energy storage system 6 through a first switch 51, the power receiving side of the low-voltage second bus 22 is electrically connected to a load 8 through a second switch 52, and the low-voltage first bus 21 is electrically connected to the low-voltage second bus 22 through a third switch 53;

[0044] A control module 3, the metering device 4 and the energy storage system 6 are all electrically connected to the control module 3, and the control module 3 controls the on / off of the third switch 53 according to the metering device 4.

[0045] The control module 3 can control the on / off of the first switch 51, the second switch 52 and the third switch 53 according to the power quantity information measured by the metering device 4, so as to realize power supply to the load 8 such as the dust removal subsystem through the power supply bus, or power supply to the load 8 by the energy storage system 6, and avoid the load 8 from being powered off and unable to work in case of a power supply bus failure.

[0046] In this embodiment, the load 8 includes a dust removal subsystem and electrical equipment. The power receiving side of the low-voltage second bus 22 is electrically connected to the dust removal subsystem, and the dust removal subsystem is electrically connected to the electrical equipment. The power supply voltage on the medium-voltage power supply bus 1 is 10 KV or 6 KV, and the power supply voltage on the low-voltage power supply bus 2 is 400 V.

[0047] The control module 3 is connected to the metering devices 4 and switches (including the first switch 51, the second switch 52 and the third switch 53) of each circuit, receives the information of the metering devices 4 of each circuit and controls the opening and closing of the switches, and predicts, calculates and analyzes and manages according to the operation data of the dust removal subsystem, as well as the energy storage energy, state, time sequence, etc. It intelligently judges and regulates the processes of power supply, charging, energy storage power supply, etc. in the distributed dust removal system area, and automatically allocates and switches the regional AC power supply and energy storage power supply during the "peak and valley" periods through the control module 3 to meet the production power consumption of the dust removal subsystem, and realizes centralized energy storage, decentralized power supply, energy storage sharing and intelligent allocation.

[0048] In the actual design, the energy storage system 6 and the dust removal subsystem each have their own independent controllers. The control module 3 controls all the independent controllers according to the metering device 4 to achieve the device layer management of the energy storage system 6 and the dust removal subsystem in the regional distribution system, unify the communication interfaces and protocols, and achieve unattended real-time monitoring.

[0049] Among them, the metering device 4 collects the voltage data, current data, and power data of the medium-voltage power supply bus 1, and this collection process is an existing technology. The control module 3 analyzes the data collected by the metering device 4, as well as the energy storage energy, status, timing, etc. data of the energy storage system 6 itself, and then automatically allocates and switches according to the "peak-valley" periods whether to use the stable AC power provided by the medium-voltage power supply bus 1, the power used by the energy storage system 6, or both.

[0050] Generally speaking, the electricity price mechanism of the power supply system divides 24 hours of a day into multiple periods such as peak, spike, and valley. For example, the periods are divided as follows: spike: 9:00 - 11:00, 15:00 - 17:00; peak: 8:00 - 9:00, 13:00 - 15:00, 17:00 - 22:00; valley: 11:00 - 13:00, 22:00 - 8:00 the next day. The electricity prices in each period are different, and the electricity prices between peak and valley differ by 3 to 4 times. The electricity price during the spike period is increased by more than 20% on the basis of the peak electricity price. This enables the efficient realization of the demand for the rational use of public resources. Therefore, the discharge capacity of the energy storage system 6 is considered according to the maximum load of the centralized dust removal in the spike and peak electricity consumption in the region, and the charging capacity is considered in any one of the two valley periods to meet the electricity consumption demand of the centralized dust removal in the next peak or spike period.

[0051] Specifically: The 10kV (or 6kV) medium-voltage power supply bus 1 provides a double-loop power supply. One loop power supply is electrically connected to the energy storage system 6 through the first switch 51 and the step-down transformer. The other loop is electrically connected to the load 8 through the second switch 52 and the step-down transformer, that is, electrically connected to the dust removal subsystem. The two low-voltage buses are electrically connected through the third switch 53.

[0052] Among them, the medium-voltage power supply bus 1 includes a medium-voltage first power supply bus 11 and a medium-voltage second power supply bus 12.

[0053] The power supply side of the first medium-voltage power supply bus 11 is electrically connected to the power supply through a vacuum circuit breaker QF1, and the power receiving side of the first medium-voltage power supply bus 11 is electrically connected to the power supply side of the first low-voltage bus 21 through a series of vacuum circuit breaker QF4 and the first step-down transformer 71 (10kV / 400V). The power supply side of the second medium-voltage power supply bus 12 is electrically connected to the power supply through a vacuum circuit breaker QF2, and the power receiving side of the second medium-voltage power supply bus 12 is electrically connected to the power supply side of the second low-voltage bus 22 through a series of vacuum circuit breaker QF5 and the second step-down transformer 72 (10kV / 400V). The first medium-voltage power supply bus 11 is electrically connected to the second medium-voltage power supply bus 12 through a vacuum circuit breaker QF3. The power receiving sides of the first medium-voltage power supply bus 11 and the second medium-voltage power supply bus 12 are respectively electrically connected to a metering device 4. The control terminals of the vacuum circuit breaker QF1, the vacuum circuit breaker QF2, the vacuum circuit breaker QF3, the vacuum circuit breaker QF4, and the vacuum circuit breaker QF5 are all electrically connected to the control module 3.

[0054] By setting two medium-voltage power supply buses 1, it is prevented that the power outage cannot be used due to the damage of one way; at the same time, by setting vacuum circuit breakers, it is convenient to control the on and off of each way.

[0055] In this embodiment, the power receiving side of the first low-voltage bus 21 is respectively electrically connected to an energy storage system 6 through a vacuum circuit breaker QF6, and the control terminal of the vacuum circuit breaker QF6 is electrically connected to the control module 3. Each energy storage system 6 has a vacuum circuit breaker QF6 to realize on and off, which is convenient to charge a single or multiple energy storage systems 6, and is also convenient to adjust the number of discharged energy storage systems 6.

[0056] Each energy storage system 6 includes an independent energy storage converter, a battery pack, an energy management system, and a battery management system, and is managed in an independent distributed mode to reduce capacity loss. The battery management system includes a battery thermal management system. Temperature sensors and smoke sensors are provided in the energy storage cabinet, and the information is uploaded to the control module 3; the battery cabinet adopts a reasonable air duct design and intelligent active air cooling to control the cooling of the energy storage cabinet and realize efficient and reliable thermal management of the entire energy storage system 6. For the energy storage system 6, this is relatively common and is prior art.

[0057] The power receiving side of the second low-voltage bus 22 is respectively electrically connected to a load 8 through a vacuum circuit breaker QF8, and the control terminal of the vacuum circuit breaker QF8 is electrically connected to the control module 3. By setting the vacuum circuit breaker QF8 to realize on and off, it is convenient to control the operation of a single or multiple loads 8. Multiple vacuum circuit breakers QF8 are represented by QF81~QF8n.

[0058] The third switch 53 is a vacuum circuit breaker QF7, and the control terminal of the vacuum circuit breaker QF7 is electrically connected to the control module 3. Using a vacuum circuit breaker as the third switch 53 facilitates the control module 3 to achieve opening or closing through electric control. When the "valley" energy storage of the energy storage system 6 and the centralized dust removal system work simultaneously, the vacuum circuit breaker QF7 is opened, and they are independent of each other and do not affect each other. When the energy storage system 6 releases energy during "peak electricity", QF4 and QF5 are opened, and QF7 is closed and connected to supply the operation of each subsystem of the centralized dust removal.

[0059] See Figure 2 As shown, the power supply side of the medium-voltage power supply bus 1 is electrically connected to the power supply through the vacuum circuit breaker QF, the power receiving side of the medium-voltage power supply bus 1 is electrically connected to the power supply end of the low-voltage power supply bus 2 through a step-down transformer, the power receiving side of the low-voltage power supply bus 2 is electrically connected to the power supply side of the low-voltage first bus 21 through the vacuum circuit breaker QF41, and the power receiving side of the low-voltage first bus 21 is electrically connected to an energy storage system 6 through a vacuum circuit breaker QF6 respectively.

[0060] The power receiving side of the low-voltage power supply bus 2 is also electrically connected to the power supply side of the low-voltage second bus 22 through the vacuum circuit breaker QF51, and the power receiving side of the low-voltage second bus 22 is electrically connected to a load 8 through a vacuum circuit breaker QF8 respectively.

[0061] The low-voltage first bus 21 is electrically connected to the low-voltage second bus 22 through the vacuum circuit breaker QF7, and the control terminals of the vacuum circuit breaker QF, the vacuum circuit breaker QF41, the vacuum circuit breaker QF51, the vacuum circuit breaker QF6, the vacuum circuit breaker QF7, and the vacuum circuit breaker QF8 are all electrically connected to the control module 3.

[0062] When using a single medium-voltage power supply bus 1, it is divided into two independent low-voltage bus power supplies through the vacuum circuit breaker QF41 and the vacuum circuit breaker QF51 to ensure that the power supplies for the energy storage system 6 and the load 8 are separated and ensure two-way power supply.

[0063] In this embodiment, the total capacity of the energy storage system 6 is greater than or equal to the maximum operating load power of the dust removal subsystem, meeting the demand for using valley electricity during peak and spike electricity consumption of the centralized dust removal system.

[0064] Multiple energy storage systems 6 are actually in a parallel operation mode. Generally, multiple energy storage systems 6 are set to the same type, multiple energy storage batteries are connected to the power grid, and the energy storage sharing principle is adopted. According to the power required by the control objectives of different dust removal subsystems of the centralized dust removal, the corresponding energy storage batteries are called, giving full play to the characteristics of the battery packs of multiple energy storage systems 6, and using the similarity and complementarity of the load curves of the centralized dust removal subsystems to improve the energy storage utilization rate, reducing the investment cost while ensuring economic benefits.

[0065] In actual production design, the energy storage system 6 is also electrically connected to a photovoltaic power generation system 9. The photovoltaic power generation system 9 includes a distributed system process plant roof photovoltaic energy storage system 6. Through the plant roof photovoltaic power generation system 9, photovoltaic energy conversion and energy storage, solar energy is converted into direct current electrical energy, and the direct current electrical energy is stored in the energy storage system 6 through the energy storage system 6. During the "peak electricity" stage, it supplies the distributed dust removal system, realizing the efficient utilization of the solar energy on the plant roof and the continuous and stable supply of energy. It increases the source of electrical energy acquisition and prevents power outages.

[0066] Multiple energy storage systems 6 are connected in parallel to the energy storage low-voltage bus through power supply switches, and multiple dust removal subsystems are connected in parallel to the dust removal system low-voltage bus.

[0067] In actual use, the load 8 is not limited to the dust removal subsystem. There are similar batching processes in raw materials, lime, sintering, coking, ironmaking, steelmaking, etc. Other industries similar to this can also adopt the energy storage power supply system of this embodiment.

[0068] The utility model has the following beneficial effects:

[0069] 1. Optimize the configuration of the resources of the independent and dispersed energy storage systems 6 within the engineering project, and hand it over to the control module 3 for unified coordination according to the needs of the distributed dust removal subsystems, realizing "centralized energy storage and power supply on demand", fully releasing the energy storage capacity of each unit of the energy storage system 6, and realizing the unified coordination and sharing of energy storage resources to serve the entire distributed dust removal subsystem.

[0070] 2. According to the power consumption requirements of the distributed dust removal system, intermittent operation, and the characteristics of 380V low-voltage power supply for multiple dust removal subsystems, the power supply design of the distributed dust removal system increases the energy storage battery pack according to the maximum operating power of the system. Moreover, when the energy storage system 6 stores energy and the distributed dust removal system work simultaneously, the control module 3 controls the circuit breaker to disconnect, so that they operate independently of each other without affecting each other. When the energy storage system 6 releases energy, the control module 3 controls the circuit breaker to close and connect. Even if a single energy storage system 6 power distribution failure only affects that unit and has no impact on other units, reducing the operation failure rate of the energy storage power station and ensuring the stable and reliable operation of the distributed dust removal system.

[0071] 3. Particularly, for enterprises with complex surrounding environments of regional power supply lines and relatively weak power supply capabilities, the shared energy storage of the energy storage system 6 solves the major safety hazards caused to the safe production of enterprises in the event of accidents such as 10kV power outages.

[0072] 4. By operating multiple energy storage systems 6 in parallel, multiple energy storage batteries of the same or different types are connected to the power grid. According to different control objectives of centralized dust removal, the corresponding energy storage batteries are called, giving full play to the characteristics of the energy storage batteries in the shared system, realizing the direct parallel operation of the energy storage batteries, and meeting the needs of multiple subsystems of centralized dust removal to share energy storage from a set of multi-unit energy storage system 6 equipment during "peak power" operation, improving the energy storage utilization rate, reducing the investment cost while ensuring economic benefits.

[0073] 5. By adding backup capacity for centralized dust removal through the energy storage system 6, and through the centralized monitoring of the energy storage unit and the working status and trend of the interlocking action between the centralized dust removal subsystem and the production process by the "control module 3", accurate, low-carbon and economic operation management is achieved. This not only improves the safety and quality of the power supply system, improves the peak-valley difference of the load 8 of the dust removal subsystem, but also improves the system efficiency and equipment utilization rate, and obtains considerable economic benefits by making full use of the "peak-valley" electricity price difference.

[0074] In the description of the present application, the descriptions referring to terms such as "one embodiment", "some embodiments", "in this embodiment", "specific example", or "some examples" mean that the specific features, mechanisms, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0075] As mentioned above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A distributed energy storage power supply system, characterized in that Comprising: A medium-voltage power supply busbar (1), the power supply side of the medium-voltage power supply busbar (1) is electrically connected to a power supply, and the power receiving side of the medium-voltage power supply busbar (1) is electrically connected to a metering device (4); A low-voltage power supply busbar (2), the power receiving side of the medium-voltage power supply busbar (1) is also electrically connected to the power supply sides of a low-voltage first busbar (21) and a low-voltage second busbar (22) respectively through a step-down transformer (7), the power receiving side of the low-voltage first busbar (21) is electrically connected to an energy storage system (6) through a first switch (51), the power receiving side of the low-voltage second busbar (22) is electrically connected to a load (8) through a second switch (52), and the low-voltage first busbar (21) is electrically connected to the low-voltage second busbar (22) through a third switch (53); A control module (3), both the metering device (4) and the energy storage system (6) are electrically connected to the control module (3), and the control module (3) controls the on / off of the third switch (53) according to the metering device (4).

2. The distributed energy storage power supply system according to claim 1, wherein The medium-voltage power supply busbar (1) includes a medium-voltage first power supply busbar (11) and a medium-voltage second power supply busbar (12); The power supply side of the medium-voltage first power supply busbar (11) is electrically connected to a power supply through a vacuum circuit breaker QF1, and the power receiving side of the medium-voltage first power supply busbar (11) is electrically connected to the power supply side of the low-voltage first busbar (21) through a series vacuum circuit breaker QF4 and a first step-down transformer (71); The power supply side of the medium-voltage second power supply busbar (12) is electrically connected to a power supply through a vacuum circuit breaker QF2, and the power receiving side of the medium-voltage second power supply busbar (12) is electrically connected to the power supply side of the low-voltage second busbar (22) through a series vacuum circuit breaker QF5 and a second step-down transformer (72); The medium-voltage first power supply busbar (11) is electrically connected to the medium-voltage second power supply busbar (12) through a vacuum circuit breaker QF3, the power receiving sides of the medium-voltage first power supply busbar (11) and the medium-voltage second power supply busbar (12) are both electrically connected to a metering device (4) respectively, and the control terminals of the vacuum circuit breaker QF1, the vacuum circuit breaker QF2, the vacuum circuit breaker QF3, the vacuum circuit breaker QF4, and the vacuum circuit breaker QF5 are all electrically connected to the control module (3).

3. The distributed energy storage power supply system according to claim 1, wherein The power receiving side of the low-voltage first busbar (21) is electrically connected to an energy storage system (6) through a vacuum circuit breaker QF6 respectively, and the control terminal of the vacuum circuit breaker QF6 is electrically connected to the control module (3).

4. The distributed energy storage power supply system according to claim 1, wherein, The power receiving side of the low-voltage second busbar (22) is electrically connected to a load (8) through a vacuum circuit breaker QF8 respectively, and the control terminal of the vacuum circuit breaker QF8 is electrically connected to the control module (3).

5. The distributed energy storage power supply system according to claim 1, wherein, The third switch (53) is a vacuum circuit breaker QF7, and the control terminal of the vacuum circuit breaker QF7 is electrically connected to the control module (3).

6. The distributed energy storage power supply system according to claim 1, wherein The power supply side of the medium-voltage power supply busbar (1) is electrically connected to the power supply through a vacuum circuit breaker QF, and the power receiving side of the medium-voltage power supply busbar (1) is electrically connected to the power supply end of the low-voltage power supply busbar (2) through a step-down transformer. The power receiving side of the low-voltage power supply busbar (2) is electrically connected to the power supply side of the first low-voltage busbar (21) through a vacuum circuit breaker QF41, and the power receiving side of the first low-voltage busbar (21) is electrically connected to an energy storage system (6) through a vacuum circuit breaker QF6 respectively. The power receiving side of the low-voltage power supply busbar (2) is also electrically connected to the power supply side of the second low-voltage busbar (22) through a vacuum circuit breaker QF51, and the power receiving side of the second low-voltage busbar (22) is electrically connected to a load (8) through a vacuum circuit breaker QF8 respectively. The first low-voltage busbar (21) is electrically connected to the second low-voltage busbar (22) through a vacuum circuit breaker QF7, and the control terminals of the vacuum circuit breaker QF, the control terminal of the vacuum circuit breaker QF41, the control terminal of the vacuum circuit breaker QF51, the control terminal of the vacuum circuit breaker QF6, the control terminal of the vacuum circuit breaker QF7, and the control terminal of the vacuum circuit breaker QF8 are all electrically connected to the control module (3).

7. The distributed energy storage power supply system according to claim 1, wherein The load (8) includes a dust removal subsystem and electrical equipment. The power receiving side of the second low-voltage busbar (22) is electrically connected to the dust removal subsystem, and the dust removal subsystem is electrically connected to the electrical equipment.

8. The distributed energy storage power supply system according to claim 1, wherein, The total capacity of the energy storage system (6) is greater than or equal to the maximum operating load power of the dust removal subsystem.

9. The distributed energy storage power supply system according to claim 1, wherein The energy storage system (6) is also electrically connected to a photovoltaic power generation system (9).

10. The distributed energy storage power supply system according to claim 1, wherein, The power supply voltage on the medium-voltage power supply busbar (1) is 10 KV or 6 KV, and the power supply voltage on the low-voltage power supply busbar (2) is 400 V.

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