A power supply system based on ac-dc multi-microgrid architecture

Abstract

The present application belongs to the technical field of micro-grid, and particularly relates to a power supply system based on AC / DC multi-micro-grid architecture. The energy storage system is configured on each AC bus and DC bus as the supporting power supply of the corresponding micro-grid and acts as the power supply for peak shaving and uninterrupted power supply. The multi-voltage level, multi-power path, multi-power supply power fusion operation and power load multi-power guarantee are realized through the dynamic flexible system reconstruction technology. The present application overcomes the shortcomings of the traditional technology, such as the large amount of UPS redundant investment and the maintenance cost of the storage battery in the AC / DC hybrid power guarantee and uninterrupted power supply application. The storage battery not only consumes power, manpower and financial resources, but also needs to be re-invested and updated every 3-5 years. The present application realizes the seamless switching of multi-power supply and uninterrupted power supply, which not only changes the zombie assets into hematopoietic machines to improve the economy, but also greatly improves the stability and safety of power supply.

Description

Technical Field

[0001] This invention belongs to the field of microgrid technology, specifically relating to a power supply system based on an AC / DC multi-microgrid architecture. Background Technology

[0002] Against the backdrop of escalating energy shortages and environmental problems, the development of microgrids based on new and renewable energy sources has become a crucial technology and application. Within a given electricity consumption area, it is necessary to rationally and effectively integrate the power grid, distributed renewable energy power, self-owned power plants, and emergency power supplies to provide stable and reliable power to AC and DC loads of different voltage levels. Modern electricity demand is increasingly trending towards hybrid AC / DC power. Numerous information devices require low-voltage DC power, while electric vehicle fast-charging stations require medium-voltage DC power. In addition, the traditional widespread use of AC power, along with the expanding application of distributed renewable energy, particularly in data centers with high-reliability power requirements for information systems, not only consume large amounts of electricity but also require safe, reliable, and uninterrupted power supply, necessitating seamless switching and coordinated power supply from multiple power sources.

[0003] For AC / DC hybrid power supply and uninterrupted power supply, traditional technology uses UPS uninterruptible power supply systems to meet user power needs and ensure uninterrupted power supply. However, this approach not only increases power loss but also incurs significant investment in UPS redundancy and battery maintenance costs. Batteries not only consume electricity, manpower, and financial resources but also require replacement every 3-5 years. To change the reliance on traditional UPS systems for power supply assurance and transform this "dormant asset" into a "revenue-generating" system, this invention proposes a power supply assurance system based on an AC / DC multi-microgrid architecture. This system utilizes an innovative multi-power source integrated AC / DC microgrid architecture, employing dynamic flexible system reconfiguration technology to achieve multi-voltage levels, multi-power paths, multi-power source integrated operation, and multi-path power supply assurance for various loads. This multi-power source integrated AC / DC microgrid system effectively mitigates fluctuations in renewable energy power and completes energy storage peak shaving while simultaneously enabling planned and unplanned switching of multiple power sources and seamless switching between them. This not only transforms "dormant assets" into a "revenue-generating" system, improving economic efficiency, but also significantly increases the stability and security of the power supply. Summary of the Invention

[0004] To achieve safe, stable, economical, and reliable power supply and to ensure power supply through the integrated operation of multiple power sources in an AC / DC microgrid system, this invention specifically discloses a power supply system based on an AC / DC multi-microgrid architecture. The system comprises a dual-power supply consisting of a first power source and a second power source. The first and second power sources are connected to two sections of medium-high voltage AC power buses, a first medium-high voltage AC power bus and a second medium-high voltage AC power bus, respectively, forming two independent and controlled interconnected medium-high voltage AC / DC microgrids. These two microgrids are connected to inverters via the first and second medium-high voltage AC / DC buses, and the inverters are also connected to a dual-voltage DC microgrid via a low-voltage AC / DC bus. An EMS (Electronic Management System) central control system is connected to power equipment and electrical control switches via a communication network to form a monitoring system. This system regulates power generation and energy storage equipment, ensuring uninterrupted power supply and peak-shaving power for important DC electrical equipment, the first air conditioner and AC electrical load, the second air conditioner and AC electrical load, and auxiliary DC electrical loads.

[0005] The two independent and controlled interconnected medium- and high-voltage AC / DC microgrids are characterized as follows: A first power supply is connected to a first medium- and high-voltage AC power bus via a first power supply line control switch. This first medium- and high-voltage AC power bus connects to a first new energy generation system and, via a first transformer, sequentially connects to a first medium- and high-voltage access energy storage inverter, a first battery string, and, via a third transformer, to a first low-voltage level AC / DC microgrid composed of the first low-voltage AC power bus, thus forming two independent two-level AC / DC microgrids with different voltage levels. Simultaneously, a second power supply is connected to a second medium- and high-voltage AC power bus via a second power supply line control switch. This second medium- and high-voltage AC power bus connects to a second new energy generation system and, via a sixth transformer, sequentially connects to a second medium- and high-voltage access energy storage inverter, a fourth battery string, and, via a fourth transformer, to a second low-voltage level AC / DC microgrid composed of the second low-voltage AC power bus, thus forming another independent two-level AC / DC microgrid with different voltage levels.

[0006] The monitoring system is characterized by the following: the EMS central control system is connected via a communication network to the following switches: the first power supply line control switch, the second power supply line control switch, the medium-high voltage AC power bus connection control switch, the low-voltage AC power bus connection control switch, the medium-voltage DC bus connection control switch, the low-voltage DC power bus interconnection control switch, the first new energy power generation system, the second new energy power generation system, the first medium-high voltage access energy storage inverter, the second medium-high voltage access energy storage inverter, the first medium-high voltage AC / DC bus connection inverter, the second medium-high voltage AC / DC bus connection inverter, the first low-voltage access energy storage inverter, and the second low-voltage access... The system comprises an energy management and operation monitoring system for a data center power supply system with an AC / DC multi-microgrid architecture, consisting of an energy storage inverter, a low-voltage AC / DC bus-connected inverter, a first battery string, a second battery string, a third battery string, a fourth battery string, a low-voltage DC energy storage bidirectional DC / DC converter, a medium-voltage DC equipment power supply DC / DC converter, a medium-voltage DC bus DC / DC converter, a DC / DC converter connecting the medium-voltage and low-voltage DC buses, a photovoltaic power generation DC / DC converter, a site-wide DC power supply DC / DC converter, a low-voltage DC energy storage power supply battery string, a medium-voltage DC bus DC / DC energy storage battery string, important DC power equipment, a photovoltaic power generation array, and a medium-voltage DC charging pile.

[0007] The power supply system based on an AC / DC multi-microgrid architecture is characterized by the following: a medium-voltage DC microgrid is formed by a medium-voltage DC bus connected to a medium-voltage DC equipment DC / DC converter, a medium-voltage DC bus DC / DC converter, a photovoltaic power generation DC / DC converter, a DC power supply DC / DC converter within the power station, a DC / DC converter connected to a charging pile on the medium-voltage DC bus, corresponding important DC power equipment, a battery string of the medium-voltage DC bus DC / DC converter, a photovoltaic power generation array, auxiliary DC power loads, and a DC charging pile. Simultaneously, a first low-voltage DC power bus and a second low-voltage DC power bus are connected by an electrically controlled switch interconnected by low-voltage DC power buses. The low-voltage DC power bus is composed of two low-voltage DC power buses, which are respectively connected to the first low-voltage DC communication equipment, the first low-voltage DC protection and control equipment, the second low-voltage DC communication equipment, the second low-voltage DC protection and control equipment, and the low-voltage DC energy storage power supply battery string connected through a bidirectional DC / DC converter to form a low-voltage DC microgrid; the medium-voltage DC bus of the medium-voltage DC microgrid and the first low-voltage DC power bus of the low-voltage DC microgrid and the second low-voltage DC power bus connected by an electronic control switch interconnected by the low-voltage DC power buses are connected through a DC / DC converter connecting the medium-voltage and low-voltage DC buses to form a dual-voltage level DC microgrid.

[0008] The power supply system based on an AC / DC multi-microgrid architecture is characterized by the following AC and DC multiple power paths: A first power supply line is connected to a first medium-high voltage AC power bus via a first power supply line control switch. The first medium-high voltage AC power bus is connected to a first medium-high voltage AC / DC bus via a second transformer, which in turn connects to an inverter connected to a medium-voltage DC bus. The medium-voltage DC bus sequentially connects to a medium-voltage DC equipment power supply DC / DC converter and important DC-powered equipment, a DC-powered DC / DC converter within the station and auxiliary DC-powered loads, a control switch connecting the medium-voltage DC bus to a charging pile, and a medium-voltage DC charging pile, thus forming a medium-voltage DC power path where the first power supply line provides power to the DC loads. Simultaneously, the first medium-high voltage AC power bus is connected to a third transformer... The inverter connects to the first low-voltage AC power bus and the second low-voltage AC power bus, which is connected to the electrical control switch via the low-voltage AC power bus. These connections are respectively connected to the first air conditioner and AC power load and the second air conditioner and AC power load, forming the first power supply path for providing power to the AC load. Simultaneously, the inverter connects to the first low-voltage DC power bus and the second low-voltage DC power bus, which is connected to the electrical control switch via the low-voltage DC power bus. These connections are respectively connected to the first low-voltage DC communication equipment, the first low-voltage DC protection and control equipment, the second low-voltage DC communication equipment, the second low-voltage DC protection and control equipment, and important DC power equipment, forming the first power supply path for providing power to the DC load.

[0009] The second power supply line connects to the second medium-high voltage AC power bus via the second power supply line control switch. The second medium-high voltage AC power bus, connected to the second medium-high voltage AC / DC bus via the fifth transformer, connects to the inverter, which in turn connects to the medium-voltage DC bus. The medium-voltage DC bus sequentially connects to the medium-voltage DC equipment power supply DC / DC converter and important DC-powered equipment, the DC-powered DC / DC converter and auxiliary DC-powered loads within the station, the control switch connecting the medium-voltage DC bus to the charging pile, and the medium-voltage DC charging pile, forming the medium-voltage DC power path for the second power supply line to provide power to the DC loads. Simultaneously, the second medium-high voltage AC power bus, connected to the second low-voltage AC power bus via the fourth transformer, and the first... The low-voltage AC power bus connects to the first air conditioner and AC electrical load and the second air conditioner and AC electrical load respectively, forming a power path for the second power supply to provide power to the AC load; at the same time, the second low-voltage AC power bus connects to the first low-voltage AC power bus via an electrical control switch connected to the low-voltage AC power bus, and the inverter connects to the first low-voltage DC power bus via the low-voltage AC / DC bus. The second low-voltage DC power bus, connected to the electrical control switch interconnected by the low-voltage DC power bus, connects to the first low-voltage DC communication equipment, the first low-voltage DC protection and control equipment, the second low-voltage DC communication equipment, the second low-voltage DC protection and control equipment, and important DC electrical equipment respectively, forming a low-voltage DC power path for the second power supply to provide power to the DC load;

[0010] The first medium-high voltage access energy storage inverter, connected to the first battery string, is connected to the first medium-high voltage AC power bus via the first transformer, forming the first medium-high voltage energy storage peak-shaving power path for the first medium-high voltage access energy storage inverter. Simultaneously, the first medium-high voltage AC power bus, connected to the first medium-high voltage AC / DC bus via the second transformer, connects the inverter to the medium-voltage DC bus. The medium-voltage DC bus sequentially connects to the medium-voltage DC equipment power supply DC / DC converter and important DC electrical equipment, the DC power supply DC / DC converter and auxiliary DC electrical loads within the site, the electrical control switch connecting the medium-voltage DC bus to the charging pile, and the medium-voltage DC charging pile, forming the medium-voltage DC power path for the first medium-high voltage access energy storage inverter to provide power to the DC load. Simultaneously, the first medium-high voltage AC power bus is connected to the first medium-high voltage AC power bus via the third transformer. The low-voltage AC power bus and the second low-voltage AC power bus connected to the electrical control switch connected to the low-voltage AC power bus are respectively connected to the first air conditioner and AC power load and the second air conditioner and AC power load, forming a power path for the first medium-high voltage access energy storage inverter to provide power to the AC load; at the same time, the first low-voltage AC power bus is connected to the inverter through the low-voltage AC / DC bus to the first low-voltage DC power bus and the second low-voltage DC power bus connected to the electrical control switch interconnected by the low-voltage DC power bus, respectively connected to the first low-voltage DC communication equipment, the first low-voltage DC protection and control equipment, the second low-voltage DC communication equipment, the second low-voltage DC protection and control equipment, and important DC power equipment, forming a low-voltage DC power path for the first medium-high voltage access energy storage inverter to provide power to the DC load;

[0011] The second medium-high voltage access energy storage inverter, connected to the fourth battery string, is connected to the second medium-high voltage AC power bus via the sixth transformer, forming the second medium-high voltage energy storage peak-shaving power path for the second medium-high voltage access energy storage inverter. Simultaneously, the second medium-high voltage AC power bus, connected to the second medium-high voltage AC / DC bus via the fifth transformer, connects the inverter to the medium-voltage DC bus. The medium-voltage DC bus sequentially connects to the medium-voltage DC equipment power supply DC / DC converter and important DC electrical equipment, the DC power supply DC / DC converter and auxiliary DC electrical loads within the site, the electrical control switch connecting the medium-voltage DC bus to the charging pile, and the medium-voltage DC charging pile, forming the medium-voltage DC power path for the second medium-high voltage access energy storage inverter to provide power to the DC load. Simultaneously, the second medium-high voltage AC power bus, connected to the second low-voltage AC power bus via the fourth transformer, and the low-voltage AC... The first low-voltage AC power bus, connected to the electrical control switch of the power bus, is connected to the first air conditioner and AC power load and the second air conditioner and AC power load, forming a power path for the second medium-high voltage access energy storage inverter to provide power to the AC load. At the same time, the first low-voltage AC power bus, connected to the electrical control switch of the second low-voltage AC power bus, is connected to the inverter through the low-voltage AC / DC bus. The first low-voltage DC power bus and the second low-voltage DC power bus, connected to the electrical control switch of the interconnected low-voltage DC power bus, are respectively connected to the first low-voltage DC communication equipment, the first low-voltage DC protection and control equipment, the second low-voltage DC communication equipment, the second low-voltage DC protection and control equipment, and important DC power equipment, forming a low-voltage DC power path for the second medium-high voltage access energy storage inverter to provide power to the DC load.

[0012] The first low-voltage access energy storage inverter, connected to the second battery string, is connected to the first low-voltage AC power bus, forming the first low-voltage energy storage peak-shaving power path. The second low-voltage AC power bus, connected to the first low-voltage AC power bus via an electronic control switch, is connected to the first air conditioner and AC load and the second air conditioner and AC load, forming the power path for the first low-voltage access energy storage inverter to provide power to the AC load. At the same time, the first low-voltage AC power bus, connected to the inverter via a low-voltage AC / DC bus, is connected to the first low-voltage DC power bus and the second low-voltage DC power bus, connected via an electronic control switch interconnected by the low-voltage DC power bus, to the first low-voltage DC communication equipment, the first low-voltage DC protection and control equipment, the second low-voltage DC communication equipment, the second low-voltage DC protection and control equipment, and important DC electrical equipment, forming the low-voltage DC power path for the first low-voltage access energy storage inverter to provide power to the DC load.

[0013] The second low-voltage access energy storage inverter, connected to the third battery string, is connected to the second low-voltage AC power bus, forming the second low-voltage energy storage peak-shaving power path. The first low-voltage AC power bus, connected to the second low-voltage AC power bus via an electronic control switch, is then connected to the first and second air conditioners and AC loads, forming the power path for the second low-voltage access energy storage inverter to provide power to the AC loads. Simultaneously, the second low-voltage AC power bus is connected via a low-voltage AC power bus... The first low-voltage AC power bus connected by the electronic control switch is connected to the inverter via the low-voltage AC / DC bus. The second low-voltage DC power bus, which is connected by the electronic control switch interconnected with the low-voltage DC power bus, is connected to the first low-voltage DC communication equipment, the first low-voltage DC protection and control equipment, the second low-voltage DC communication equipment, the second low-voltage DC protection and control equipment, and important DC power equipment, forming a low-voltage DC power path for the second low-voltage access energy storage inverter to provide power to the DC load.

[0014] The low-voltage DC energy storage bidirectional DC / DC converter connected to the low-voltage DC energy storage battery string is connected to important DC power equipment. The second low-voltage DC power bus, which is connected through the first low-voltage DC power bus and the electrical control switch interconnected by the low-voltage DC power bus, is connected to the first low-voltage DC communication equipment, the first low-voltage DC protection and control equipment, the second low-voltage DC communication equipment, and the second low-voltage DC protection and control equipment, respectively. This constitutes a low-voltage DC energy storage bidirectional DC / DC converter that provides power to DC loads. At the same time, the low-voltage DC energy storage bidirectional DC / DC converter connected to the first low-voltage DC power bus constitutes a low-voltage DC energy storage peak-shaving power path.

[0015] The medium-voltage DC bus DC / DC, which connects to the energy storage battery string, is sequentially connected to the medium-voltage DC equipment power supply DC / DC and important DC electrical equipment, the DC power supply DC / DC and auxiliary DC electrical loads in the station, the electrical control switch connecting the medium-voltage DC bus to the charging pile, and the medium-voltage DC charging pile. This forms a medium-voltage energy storage DC power path where the medium-voltage DC bus DC / DC provides power to the DC load. At the same time, the medium-voltage DC bus DC / DC connects to the medium-voltage DC bus to form a medium-voltage DC energy storage peak-shaving power path.

[0016] The first low-voltage level AC / DC microgrid in the power supply system based on AC / DC multi-microgrid architecture is characterized by the following: the first low-voltage access energy storage inverter connected to the second battery string is connected to the first air conditioner and AC power load through the first low-voltage AC power bus, and is connected to the dual-voltage level DC microgrid through the low-voltage AC / DC bus, thus forming the first low-voltage level AC / DC microgrid.

[0017] The second low-voltage level AC / DC microgrid in the power supply system based on AC / DC multi-microgrid architecture is characterized by the following: the second low-voltage access energy storage inverter connected to the third battery string is connected to the second air conditioner and AC power load through the second low-voltage AC power bus, and the power control switch, the first low-voltage AC power bus and the low-voltage AC / DC bus are connected to the inverter and connected to the dual-voltage level DC microgrid, thus forming the second low-voltage level AC / DC microgrid.

[0018] This invention discloses a power supply system based on an AC / DC multi-microgrid architecture. It employs an energy storage system configured on each AC and DC bus as the supporting power source for the corresponding microgrid, serving as a peak-shaving and uninterrupted power supply. This system achieves multi-voltage level, multi-power path, and multi-power source integrated operation and multi-path power supply guarantee for power loads through dynamic flexible system reconfiguration technology. It overcomes the shortcomings of traditional UPS uninterruptible power supply systems in AC / DC hybrid power supply applications, which not only increase power loss but also significantly increase UPS redundancy investment and battery maintenance costs. Batteries not only consume electricity, manpower, and financial resources but also require reinvestment and replacement every 3-5 years. The AC / DC microgrid system with integrated multi-power sources effectively smooths out fluctuations in renewable energy power and completes energy storage peak-shaving power supply while simultaneously enabling planned and unplanned switching of multiple power sources and seamless switching between them. This not only transforms dormant assets into revenue-generating machines, improving economic efficiency, but also greatly enhances the stability and security of power supply. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a power supply system based on an AC / DC multi-microgrid architecture and its structure. Detailed Implementation

[0020] As an example, a power supply system based on an AC / DC multi-microgrid architecture is described in conjunction with the accompanying drawings. However, the described embodiments are only a portion, not all, of the embodiments of the present invention applied to a data center power supply system. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. The technology and solutions of the present invention are not limited to the content given in this example.

[0021] like Figure 1As shown, a power supply system based on an AC / DC multi-microgrid architecture is provided. The system is powered by a dual power supply consisting of a first power supply (1) and a second power supply (2). The first power supply (1) and the second power supply (2) are connected to two independent and controlled interconnected medium- and high-voltage AC / DC microgrids via two medium- and high-voltage AC power buses: a first medium- and high-voltage AC power bus (3) and a second medium- and high-voltage AC power bus (4). The two medium- and high-voltage AC / DC microgrids are connected to an inverter (203) via the first medium- and high-voltage AC / DC bus and to an inverter (204) via the second medium- and high-voltage AC / DC bus, respectively. 04) and the low-voltage AC / DC bus connects the inverter (207) to the dual-voltage level DC microgrid, and the EMS central control system (18) connects the power equipment and electrical control switch through the communication network (19) to form a monitoring system, dynamically regulate the power generation and energy storage equipment and optimize the AC and DC multiple power paths, and the multiple AC and DC power supplies are seamlessly switched to the DC power equipment (601) of the data center computer room and the first air conditioning and AC power load (801), the second air conditioning and AC power load (802) and the auxiliary DC power load (603) to achieve power supply and uninterrupted power supply and peak power supply;

[0022] The two independent and controlled interconnected high- and medium-voltage AC / DC microgrids are characterized as follows: the first power supply (1) is connected to the first medium- and high-voltage AC power bus (3) through the first power supply line control switch (5). The first medium- and high-voltage AC power bus (3) is connected to the first new energy power generation system (16) and the first medium- and high-voltage access energy storage inverter (201), the first battery string (301) are connected sequentially through the first transformer (101), and the first low-voltage level AC / DC microgrid is connected through the third transformer (103) and formed by the first low-voltage AC power bus (7), thus forming two independent AC / DC microgrids of different voltage levels. The two-level AC / DC microgrid; at the same time, the second power supply (2) is connected to the second medium-high voltage AC power bus (4) through the second power supply line control switch (6). The second medium-high voltage AC power bus (4) is connected to the second new energy power generation system (17) and the second medium-high voltage access energy storage inverter (202), the fourth battery string (304) are connected in sequence through the sixth transformer (106). The second low voltage level AC / DC microgrid is connected through the fourth transformer (104) and is composed of the second low voltage level AC / DC microgrid (8), forming another independent two-level AC / DC microgrid with different voltage levels.

[0023] The monitoring system is characterized by the following: the EMS central control system (18) is connected via a communication network (19) to the following switches respectively: the first power supply line control switch (5), the second power supply line control switch (6), the medium-high voltage AC power bus connection control switch (9), the low-voltage AC power bus connection control switch (10), the medium-voltage DC bus connection control switch (14), the low-voltage DC power bus interconnection control switch (15), the first new energy power generation system (16), the second new energy power generation system (17), the first medium-high voltage access energy storage inverter (201), the second medium-high voltage access energy storage inverter (202), the first medium-high voltage AC / DC bus connection inverter (203), the second medium-high voltage AC / DC bus connection inverter (204), the first low-voltage access energy storage inverter (205), the second low-voltage access energy storage inverter (206), and the low-voltage AC / DC... The system comprises an inverter (207), a first battery string (301), a second battery string (302), a third battery string (303), a fourth battery string (304), a low-voltage DC energy storage bidirectional DC / DC converter (401), a medium-voltage DC power supply DC / DC converter for computer room equipment (402), a medium-voltage DC bus DC / DC converter (403), a DC / DC converter connecting the medium-voltage and low-voltage DC buses (404), a photovoltaic power generation DC / DC converter (405), a DC power supply DC / DC converter for the site (406), a low-voltage DC energy storage battery string (501), a medium-voltage DC bus DC / DC energy storage battery string (502), DC power equipment for the data center computer room (601), a photovoltaic power generation array (602), and a medium-voltage DC charging pile (604), forming an energy management and operation monitoring system for a data center power supply system with an AC / DC multi-microgrid architecture.

[0024] A power supply system based on an AC / DC multi-microgrid architecture, wherein the dual-voltage-level DC microgrid is characterized by: a medium-voltage DC bus (11) connecting a medium-voltage DC power supply DC / DC (402) for the equipment in the medium-voltage DC room, a medium-voltage DC bus DC / DC (403), a photovoltaic power generation DC / DC (405), a DC power supply DC / DC (406) for the site, a DC / DC (407) for the charging pile connected to the medium-voltage DC bus to the corresponding data center equipment DC power supply equipment (601), a string of energy storage batteries (502) for the medium-voltage DC bus DC / DC, a photovoltaic power generation array (602), a DC power load (603) in the data center, and a DC charging pile (604) to form a medium-voltage DC microgrid; and simultaneously, a first low-voltage DC power bus connected by an electrical control switch (15) interconnected by a low-voltage DC power bus. The low-voltage DC power bus consisting of (12) and the second low-voltage DC power bus (13) is connected to the first low-voltage DC communication equipment (701), the first low-voltage DC protection and control equipment (702), the second low-voltage DC communication equipment (703), the second low-voltage DC protection and control equipment (704), and the low-voltage DC energy storage power supply battery string (501) connected through the low-voltage DC energy storage bidirectional DC / DC (401) to form a low-voltage DC microgrid; the medium-voltage DC bus (11) of the medium-voltage DC microgrid and the first low-voltage DC power bus (12) of the low-voltage DC microgrid and the second low-voltage DC power bus (13) connected by the power control switch (15) interconnected by the low-voltage DC power bus are connected through the DC / DC (404) connecting the medium-voltage and low-voltage DC buses to form a dual-voltage level DC microgrid.

[0025] A power supply system based on an AC / DC multi-microgrid architecture, characterized by the following AC and DC multiple power paths: the first power supply (1) is connected to the first medium-high voltage AC power bus (3) through the first power supply line control switch (5); the first medium-high voltage AC power bus (3) is connected to the first medium-high voltage AC / DC bus via the second transformer (102), which is connected to the inverter (203) and then to the medium-voltage DC bus (11); and the medium-voltage DC bus (11) is sequentially connected to the medium-voltage... The DC / DC power supply (402) for the DC equipment in the computer room and the DC power supply equipment (601) for the data center computer room, the DC power supply (406) for the site and the DC power load (603) for the data center, the electrical control switch (14) connecting the medium-voltage DC bus to the charging pile and the medium-voltage DC charging pile (604) constitute the medium-voltage DC power path for the first power supply (1) to provide power to the DC load; at the same time, the first medium-voltage AC power bus (3) passes through the third transformer (103) The first low-voltage AC power bus (7) and the second low-voltage AC power bus (8) connected by the electrical control switch (10) connected to the low-voltage AC power bus are respectively connected to the first air conditioner and AC power load (801) and the second air conditioner and AC power load (802), forming the power path of the first power supply (1) to provide power to the AC load; at the same time, the first low-voltage AC power bus (7) is connected to the inverter (207) connected to the first low-voltage DC power bus through the low-voltage AC / DC bus. (12) and the second low-voltage DC power bus (13) connected by the electrical control switch (15) interconnected by the low-voltage DC power bus are respectively connected to the first low-voltage DC communication equipment (701), the first low-voltage DC protection and control equipment (702), the second low-voltage DC communication equipment (703), the second low-voltage DC protection and control equipment (704) and the DC power equipment (601) of the data center computer room, forming a low-voltage DC power path for the first power supply (1) to provide power to the DC load;

[0026] The second power supply (2) is connected to the second medium-high voltage AC power bus (4) through the second power supply line control switch (6). The second medium-high voltage AC power bus (4) is connected to the second medium-high voltage AC / DC bus through the fifth transformer (105). The inverter (204) is connected to the medium-voltage DC bus (11). The medium-voltage DC bus (11) is connected to the medium-voltage DC equipment power supply DC / DC (402) and the data center equipment room DC power supply equipment (601) in sequence. The DC / DC power supply (406) within the station, the DC power load (603) within the data center, the electrical control switch (14) connecting the medium-voltage DC bus to the charging pile, and the medium-voltage DC charging pile (604) constitute the medium-voltage DC power path for the second power supply (2) to provide power to the DC load; at the same time, the second medium-high voltage AC power bus (4) is connected to the second low-voltage AC power bus (8) and the electrical control switch (10) connected via the low-voltage AC power bus through the fourth transformer (104). The first low-voltage AC power bus (7) is connected to the first air conditioner and AC power load (801) and the second air conditioner and AC power load (802) respectively, forming a power path for the second power supply (2) to provide power to the AC load; at the same time, the second low-voltage AC power bus (8) is connected to the first low-voltage AC power bus (7) via the electrical control switch (10) connected to the low-voltage AC power bus, and then connected to the inverter (207) via the low-voltage AC / DC bus to the first low-voltage DC power bus (802). 12) and the second low-voltage DC power bus (13) connected by the electrical control switch (15) interconnected by the low-voltage DC power bus are respectively connected to the first low-voltage DC communication equipment (701), the first low-voltage DC protection and control equipment (702), the second low-voltage DC communication equipment (703), the second low-voltage DC protection and control equipment (704) and the DC power equipment (601) of the data center computer room, forming the low-voltage DC power path of the second power supply (2) to provide power to the DC load;

[0027] The first medium-high voltage access energy storage inverter (201) connected to the first battery string 301 is connected to the first medium-high voltage AC power bus (3) through the first transformer (101), forming the first medium-high voltage energy storage peak-shaving power path of the first medium-high voltage access energy storage inverter (201). At the same time, the first medium-high voltage AC power bus (3) is connected to the first medium-high voltage AC / DC bus (103) connected to the inverter (203) through the second transformer (102), which is connected to the medium-voltage DC bus (11). The medium-voltage DC bus (11) then flows through the inverter. The secondary connection connects the medium-voltage DC power supply DC / DC converter (402) to the DC power supply equipment in the data center (601), the DC power supply DC / DC converter (406) in the station and the DC power load in the data center (603), the electrical control switch (14) connecting the medium-voltage DC bus to the charging pile, and the medium-voltage DC charging pile (604), forming a medium-voltage DC power path for the first medium-voltage access energy storage inverter (201) to provide power to the DC load; at the same time, the first medium-voltage AC power bus (3) is connected to the third transformer ( 103) The first low-voltage AC power bus (7) and the second low-voltage AC power bus (8) connected by the electrical control switch (10) connected to the low-voltage AC power bus are respectively connected to the first air conditioner and AC power load (801) and the second air conditioner and AC power load (802), forming the power path for the first medium-high voltage access energy storage inverter (201) to provide power to the AC load; at the same time, the first low-voltage AC power bus (7) is connected to the inverter (207) and the first low-voltage DC power bus through the low-voltage AC / DC bus. The second low-voltage DC power bus (13), connected by the line (12) and the electrical control switch (15) interconnected by the low-voltage DC power bus, is respectively connected to the first low-voltage DC communication equipment (701), the first low-voltage DC protection and measurement and control equipment (702), the second low-voltage DC communication equipment (703), the second low-voltage DC protection and measurement and control equipment (704), and the DC power equipment (601) of the data center computer room, forming a low-voltage DC power path for the first medium-high voltage access energy storage inverter (201) to provide power to the DC load;

[0028] The second medium-high voltage access energy storage inverter (202), which is connected to the fourth battery string (304), is connected to the second medium-high voltage AC power bus (4) through the sixth transformer (106), forming the second medium-high voltage energy storage peak-shaving power path of the second medium-high voltage access energy storage inverter (202). At the same time, the second medium-high voltage AC power bus (4) is connected to the second medium-high voltage AC / DC bus, which is connected to the inverter (204) through the fifth transformer (105), and then connected to the medium-voltage DC bus (11). The medium-voltage DC bus (11) is then sequentially connected to the medium-voltage DC equipment room. The equipment power supply DC / DC (402) and data center computer room DC power equipment (601), the site DC power supply DC / DC (406) and data center DC power load (603), the electrical control switch (14) connecting the medium-voltage DC bus to the charging pile and the medium-voltage DC charging pile (604) constitute the medium-voltage DC power path for the second medium-voltage access energy storage inverter (202) to provide power to the DC load; at the same time, the second medium-voltage AC power bus (4) is connected to the second low-voltage AC power bus (604) through the fourth transformer (104). 8) and the first low-voltage AC power bus (7) connected by the control switch (10) connected to the low-voltage AC power bus are respectively connected to the first air conditioner and AC power load (801) and the second air conditioner and AC power load (802), forming the power path for the second medium-high voltage access energy storage inverter (202) to provide power to the AC load; at the same time, the first low-voltage AC power bus (7) connected to the second low-voltage AC power bus (8) via the control switch (10) connected to the low-voltage AC power bus is connected to the inverter (207) through the low-voltage AC / DC bus. The first low-voltage DC power bus (12) and the second low-voltage DC power bus (13) connected by the electrical control switch (15) interconnected by the low-voltage DC power bus are respectively connected to the first low-voltage DC communication equipment (701), the first low-voltage DC protection and control equipment (702), the second low-voltage DC communication equipment (703), the second low-voltage DC protection and control equipment (704) and the DC power equipment (601) of the data center computer room, forming a low-voltage DC power path for the second medium-high voltage access energy storage inverter (202) to provide power to the DC load;

[0029] The first low-voltage access energy storage inverter (205), which connects to the second battery string (302), is connected to the first low-voltage AC power bus (7), forming the first low-voltage energy storage peak-shaving power path. The second low-voltage AC power bus (8), which is connected to the first air conditioner and AC power load (801) and the second air conditioner and AC power load (802) respectively, is connected to the first low-voltage access energy storage inverter (205) through the electrical control switch (10) connected to the low-voltage AC power bus, forming the power path for the first low-voltage access energy storage inverter (205) to provide power to the AC load. At the same time, the first low-voltage AC power bus (7) is connected to the first low-voltage AC power bus (8) through the first low-voltage AC power bus (7) through the second low-voltage AC power bus (8). The low-voltage AC / DC bus is connected to the inverter (207), which is connected to the first low-voltage DC power bus (12) and the second low-voltage DC power bus (13) connected by the electrical control switch (15) interconnected by the low-voltage DC power bus. These are respectively connected to the first low-voltage DC communication equipment (701), the first low-voltage DC protection and control equipment (702), the second low-voltage DC communication equipment (703), the second low-voltage DC protection and control equipment (704), and the DC power equipment (601) of the data center computer room, forming a low-voltage DC power path for the first low-voltage access energy storage inverter (205) to provide power to the DC load.

[0030] The second low-voltage access energy storage inverter (206), connected to the third battery string (303), is connected to the second low-voltage AC power bus (8), forming the second low-voltage energy storage peak-shaving power path. The first low-voltage AC power bus (7), connected to the second low-voltage AC power bus (8) via the low-voltage AC power bus-connected electronic control switch (10), is connected to the first air conditioner and AC power load (801) and the second air conditioner and AC power load (802), forming the power path for the second low-voltage access energy storage inverter (206) to provide power to the AC loads. At the same time, the second low-voltage AC power bus (8) is connected to the low-voltage AC power bus-connected electronic control switch (10). The first low-voltage AC power bus (7) is connected to the inverter (207) via the low-voltage AC / DC bus. The first low-voltage DC power bus (12) and the second low-voltage DC power bus (13) connected by the electrical control switch (15) interconnected via the low-voltage DC power bus are respectively connected to the first low-voltage DC communication equipment (701), the first low-voltage DC protection and control equipment (702), the second low-voltage DC communication equipment (703), the second low-voltage DC protection and control equipment (704), and the DC power equipment (601) of the data center computer room, forming a low-voltage DC power path for the second low-voltage access energy storage inverter (206) to provide power to the DC load;

[0031] The low-voltage DC energy storage bidirectional DC / DC (401) connected to the low-voltage DC energy storage power supply battery string (501) is connected to the DC power equipment (601) in the data center computer room and the second low-voltage DC power bus (13) connected through the first low-voltage DC power bus (12) and the power control switch (15) interconnected by the low-voltage DC power bus is respectively connected to the first low-voltage DC communication equipment (701), the first low-voltage DC protection and control equipment (702), the second low-voltage DC communication equipment (703), and the second low-voltage DC protection and control equipment (704), forming a low-voltage DC power path for the low-voltage DC energy storage bidirectional DC / DC (401) to provide power to the DC load. At the same time, the low-voltage DC energy storage bidirectional DC / DC (401) is connected to the first low-voltage DC power bus (12) to form a low-voltage DC energy storage peak-shaving power path.

[0032] The medium-voltage DC bus DC / DC (403) of the energy storage battery string (502) connected to the medium-voltage DC bus DC / DC is connected to the medium-voltage DC equipment power supply DC / DC (402) and the DC power supply equipment (601) of the data center computer room, the DC power supply DC / DC (406) in the station and the DC power load (603) in the data center, the power control switch (14) connected to the charging pile of the medium-voltage DC bus and the medium-voltage DC charging pile (604) in sequence through the medium-voltage DC bus (11), forming a medium-voltage DC power path for the medium-voltage DC bus DC / DC (403) to provide power to the DC load. At the same time, the medium-voltage DC bus DC / DC (403) connected to the medium-voltage DC bus (11) forms a medium-voltage DC energy storage peak-shaving power path.

[0033] The first low-voltage level AC / DC microgrid is characterized in that: the first low-voltage access energy storage inverter (205) connected to the second battery string (302) is connected to the first air conditioner and AC power load (801) through the first low-voltage AC power bus (7) and connected to the dual-voltage level DC microgrid through the low-voltage AC / DC bus (207), thus forming the first low-voltage level AC / DC microgrid.

[0034] The second low-voltage level AC / DC microgrid is characterized in that: the second low-voltage access energy storage inverter (206) connected to the third battery string (303) is connected to the second air conditioner and AC power load (802) respectively through the second low-voltage AC power bus (8), and the control switch (10), the first low-voltage AC power bus (7) and the low-voltage AC / DC bus are connected to the inverter (207) to form a dual-voltage level DC microgrid, thus constituting the second low-voltage level AC / DC microgrid.

[0035] This invention discloses a power supply system based on an AC / DC multi-microgrid architecture. Utilizing an innovative multi-source integrated AC / DC microgrid system architecture, an energy storage system is configured on the power bus of each microgrid to serve as a supporting power source for the corresponding microgrid's isolated operation, and to provide peak shaving and uninterrupted power supply. This system achieves multi-source power supply through dynamic flexible system reconfiguration technology, enabling integrated operation of multiple voltage levels, multiple power paths, and multiple power sources, as well as ensuring power supply to multiple loads. It overcomes the shortcomings of traditional UPS uninterruptible power supply systems in AC / DC hybrid power supply applications, which not only increase power losses but also significantly increase UPS redundancy investment and battery maintenance costs. Batteries not only consume electricity, manpower, and financial resources but also require replacement every 3-5 years. The multi-source integrated AC / DC microgrid system effectively smooths out fluctuations in renewable energy power and completes energy storage peak shaving while simultaneously enabling planned and unplanned switching of multiple power sources and seamless switching between them. This not only transforms dormant assets into revenue-generating machines, improving economic efficiency, but also greatly enhances the stability and security of power supply.

Claims

1. A power supply system based on an AC / DC multi-microgrid architecture, wherein a dual power supply consisting of a first power supply (1) and a second power supply (2) provides power. The first power supply (1) and the second power supply (2) are connected to two medium- and high-voltage AC / DC microgrids through two medium- and high-voltage AC power buses, namely the first medium- and high-voltage AC power bus (3) and the second medium- and high-voltage AC power bus (4), respectively. The two medium- and high-voltage AC / DC microgrids are connected to an inverter (203) through the first medium- and high-voltage AC / DC bus. The second high-voltage AC / DC bus inverter (204) and the low-voltage AC / DC bus inverter (207) are connected to a dual-voltage DC microgrid. The EMS central control system (18) is connected to the power equipment and electrical control switches through the communication network (19) to form a monitoring system, which regulates the power generation and energy storage equipment, and provides power supply and uninterrupted power supply and peak-shaving power supply for important DC power equipment (601), the first air conditioning and AC power load (801), the second air conditioning and AC power load (802), and the auxiliary DC power load (603). The two independent and controlled interconnected medium- and high-voltage AC / DC microgrids are characterized as follows: the first power supply (1) is connected to the first medium- and high-voltage AC power bus (3) through the first power supply line control switch (5). The first medium- and high-voltage AC power bus (3) is connected to the first new energy power generation system (16) and the first medium- and high-voltage access energy storage inverter (201), the first battery string (301) are connected sequentially through the first transformer (101), and the first low-voltage level AC / DC microgrid is connected through the third transformer (103) and composed of the first low-voltage AC power bus (7), thus forming independent AC / DC microgrids of different voltage levels. Two-level AC / DC microgrid; at the same time, the second power supply (2) is connected to the second medium-high voltage AC power bus (4) through the second power supply line control switch (6), and the second medium-high voltage AC power bus (4) is connected to the second new energy power generation system (17) and the second medium-high voltage access energy storage inverter (202), the fourth battery string (304) are connected in sequence through the sixth transformer (106), and the second low voltage level AC / DC microgrid is connected through the fourth transformer (104) and the second low voltage level AC / DC microgrid composed of the second low voltage AC power bus (8), forming another independent two-level AC / DC microgrid with different voltage levels; The monitoring system is characterized by the following: the EMS central control system (18) is connected via a communication network (19) to the following switches respectively: the first power supply line control switch (5), the second power supply line control switch (6), the medium-high voltage AC power bus connection control switch (9), the low-voltage AC power bus connection control switch (10), the medium-voltage DC bus connection control switch (14), the low-voltage DC bus interconnection control switch (15), the first new energy power generation system (16), the second new energy power generation system (17), the first medium-high voltage access energy storage inverter (201), the second medium-high voltage access energy storage inverter (202), the first medium-high voltage AC / DC bus connection inverter (203), the second medium-high voltage AC / DC bus connection inverter (204), the first low-voltage access energy storage inverter (205), and the second low-voltage access energy storage inverter (206). The system comprises an AC / DC bus connected inverter (207), a first battery string (301), a second battery string (302), a third battery string (303), a fourth battery string (304), a low-voltage DC energy storage bidirectional DC / DC converter (401), a medium-voltage DC equipment power supply DC / DC converter (402), a medium-voltage DC bus DC / DC converter (403), a DC / DC converter connecting the medium-voltage and low-voltage DC buses (404), a photovoltaic power generation DC / DC converter (405), a station-level DC power supply DC / DC converter (406), a low-voltage DC energy storage power supply battery string (501), a medium-voltage DC bus DC / DC energy storage battery string (502), important DC power equipment (601), a photovoltaic power generation array (602), and a medium-voltage DC charging pile (604), forming an AC / DC multi-microgrid architecture for the data center power supply system's energy management and operation monitoring system.

2. The power supply system based on AC / DC multi-microgrid architecture according to claim 1, wherein the dual-voltage-level DC microgrid is characterized by: a medium-voltage DC bus (11) being connected to a medium-voltage DC equipment power supply DC / DC (402), a medium-voltage DC bus DC / DC (403), a photovoltaic power generation DC / DC (405), a station DC power supply DC / DC (406), a medium-voltage DC bus connected to a charging pile DC / DC (407) connected to the corresponding important DC power equipment (601), a medium-voltage DC bus DC / DC energy storage battery string (502), a photovoltaic power generation array (602), an auxiliary DC power load (603), and a DC charging pile (604) to form a medium-voltage DC microgrid; and simultaneously, a first low-voltage DC power supply connected by an electrical control switch (15) interconnected by a low-voltage DC power bus. The low-voltage DC power bus consisting of bus (12) and the second low-voltage DC power bus (13) is connected to the first low-voltage DC communication equipment (701), the first low-voltage DC protection and control equipment (702), the second low-voltage DC communication equipment (703), the second low-voltage DC protection and control equipment (704), and the low-voltage DC energy storage power supply battery string (501) connected through the low-voltage DC energy storage bidirectional DC / DC (401) to form a low-voltage DC microgrid; the medium-voltage DC bus (11) of the medium-voltage DC microgrid and the first low-voltage DC power bus (12) of the low-voltage DC microgrid and the second low-voltage DC power bus (13) connected by the electrical control switch (15) interconnected by the low-voltage DC power bus are connected through the DC / DC (404) connecting the medium-voltage and low-voltage DC buses to form a dual-voltage level DC microgrid.

3. A power supply system based on AC / DC multi-microgrid architecture according to claim 1, wherein the AC and DC multi-power paths are characterized as follows: the first power supply (1) is connected to the first medium-high voltage AC power bus (3) through the first power supply line control switch (5); the first medium-high voltage AC power bus (3) is connected to the first medium-high voltage AC / DC bus (203) connected to the first medium-high voltage AC / DC bus (11) through the second transformer (102); the medium-voltage DC bus (11) is sequentially connected to the medium-voltage DC equipment power supply DC / DC (402) and important DC power equipment (601), the DC power supply DC / DC (406) in the station and auxiliary DC power load (603), the control switch (14) connecting the medium-voltage DC bus and the charging pile and the medium-voltage DC charging pile (604), thus forming a medium-voltage DC power path in which the first power supply (1) provides power to the DC load; at the same time, the first medium-high voltage AC power bus (3) is connected to the third transformer... (103) The first low-voltage AC power bus (7) and the second low-voltage AC power bus (8) connected by the electrical control switch (10) connected to the low-voltage AC power bus are respectively connected to the first air conditioner and AC power load (801) and the second air conditioner and AC power load (802), forming the power path for the first power supply (1) to provide power to the AC load; at the same time, the first low-voltage AC power bus (7) is connected to the inverter (207) through the low-voltage AC / DC bus to connect to the first low-voltage DC power supply. The power bus (12) and the second low-voltage DC power bus (13) connected by the electrical control switch (15) interconnected by the low-voltage DC power bus are respectively connected to the first low-voltage DC communication equipment (701), the first low-voltage DC protection and measurement and control equipment (702), the second low-voltage DC communication equipment (703), the second low-voltage DC protection and measurement and control equipment (704) and important DC electrical equipment (601), forming a low-voltage DC power path for the first power supply (1) to provide power to the DC load; The second power supply (2) is connected to the second medium-high voltage AC power bus (4) through the second power supply line control switch (6). The second medium-high voltage AC power bus (4) is connected to the second medium-high voltage AC / DC bus through the fifth transformer (105). The inverter (204) is connected to the medium-voltage DC bus (11). The medium-voltage DC bus (11) is connected to the medium-voltage DC equipment power supply DC / DC (402) and important DC power equipment (601) in sequence. The DC / DC power supply (406) and auxiliary DC load (603), the electrical control switch (14) connecting the medium-voltage DC bus to the charging pile, and the medium-voltage DC charging pile (604) constitute the medium-voltage DC power path for the second power supply (2) to provide power to the DC load; at the same time, the second medium-voltage AC power bus (4) is connected to the second low-voltage AC power bus (8) through the fourth transformer (104) and the electrical control switch (10) connected through the low-voltage AC power bus. The first low-voltage AC power bus (7) is connected to the first air conditioner and AC power load (801) and the second air conditioner and AC power load (802) respectively, forming a power path for the second power supply (2) to provide power to the AC load; at the same time, the second low-voltage AC power bus (8) is connected to the first low-voltage AC power bus (7) through the electrical control switch (10) connected to the low-voltage AC power bus, and the inverter (207) is connected to the first low-voltage DC power bus through the low-voltage AC / DC bus. (12) and the second low-voltage DC power bus (13) connected by the electrical control switch (15) interconnected by the low-voltage DC power bus are respectively connected to the first low-voltage DC communication equipment (701), the first low-voltage DC protection and control equipment (702), the second low-voltage DC communication equipment (703), the second low-voltage DC protection and control equipment (704) and important DC power equipment (601), forming the low-voltage DC power path of the second power supply (2) to provide power to the DC load; The first medium-high voltage access energy storage inverter (201), connected to the first battery string (301), is connected to the first medium-high voltage AC power bus (3) through the first transformer (101), forming the first medium-high voltage energy storage peak-shaving power path of the first medium-high voltage access energy storage inverter (201). At the same time, the first medium-high voltage AC power bus (3) is connected to the first medium-high voltage AC / DC bus (103) connected to the inverter (203) through the second transformer (102), which is connected to the medium-voltage DC bus (11). The medium-voltage DC power supply DC / DC converter (402) and important DC power equipment (601), the DC power supply DC / DC converter (406) and auxiliary DC power load (603) in the station, the electrical control switch (14) connecting the medium-voltage DC bus to the charging pile and the medium-voltage DC charging pile (604) are connected in sequence to form a medium-voltage DC power path for the first medium-voltage access energy storage inverter (201) to provide power to the DC load; at the same time, the first medium-voltage AC power bus (3) is connected to the third transformer (10) through the third transformer (10) 3) The first low-voltage AC power bus (7) and the second low-voltage AC power bus (8) connected by the electrical control switch (10) connected to the low-voltage AC power bus are respectively connected to the first air conditioner and AC power load (801) and the second air conditioner and AC power load (802), forming the power path for the first medium-high voltage access energy storage inverter (201) to provide power to the AC load; at the same time, the first low-voltage AC power bus (7) is connected to the inverter (207) through the low-voltage AC / DC bus to connect to the first low-voltage DC power bus. The second low-voltage DC power bus (13), which is connected to the bus (12) and the electrical control switch (15) interconnected by the low-voltage DC power bus, is respectively connected to the first low-voltage DC communication equipment (701), the first low-voltage DC protection and measurement and control equipment (702), the second low-voltage DC communication equipment (703), the second low-voltage DC protection and measurement and control equipment (704), and important DC power equipment (601), forming a low-voltage DC power path for the first medium-high voltage access energy storage inverter (201) to provide power to the DC load; The second medium-high voltage access energy storage inverter (202), connected to the fourth battery string (304), is connected to the second medium-high voltage AC power bus (4) through the sixth transformer (106), forming the second medium-high voltage energy storage peak-shaving power path of the second medium-high voltage access energy storage inverter (202). At the same time, the second medium-high voltage AC power bus (4) is connected to the second medium-high voltage AC / DC bus, which is connected to the inverter (204) through the fifth transformer (105), and the inverter (204) is connected to the medium-voltage DC bus (11). The medium-voltage DC bus (11) is then sequentially connected to the medium-voltage DC bus. The DC / DC power supply (402) for the main equipment and the important DC power equipment (601), the DC power supply DC / DC (406) and the auxiliary DC power load (603) in the station, the electrical control switch (14) connecting the medium-voltage DC bus to the charging pile and the medium-voltage DC charging pile (604) constitute the medium-voltage DC power path for the second medium-voltage access energy storage inverter (202) to provide power to the DC load; at the same time, the second medium-voltage AC power bus (4) is connected to the second low-voltage AC power bus (8) through the fourth transformer (104) and The first low-voltage AC power bus (7), connected to the control switch (10) connected to the low-voltage AC power bus, is connected to the first air conditioner and AC power load (801) and the second air conditioner and AC power load (802), respectively, forming the power path for the second medium-high voltage access energy storage inverter (202) to provide power to the AC load; at the same time, the second low-voltage AC power bus (8), connected to the first low-voltage AC power bus (7) via the control switch (10) connected to the low-voltage AC power bus, is connected to the inverter (207) via the low-voltage AC / DC bus. The first low-voltage DC power bus (12) and the second low-voltage DC power bus (13) connected by the electrical control switch (15) interconnected by the low-voltage DC power bus are respectively connected to the first low-voltage DC communication equipment (701), the first low-voltage DC protection and measurement and control equipment (702), the second low-voltage DC communication equipment (703), the second low-voltage DC protection and measurement and control equipment (704) and important DC power equipment (601), forming a low-voltage DC power path for the second medium-high voltage access energy storage inverter (202) to provide power to the DC load; The first low-voltage access energy storage inverter (205), connected to the second battery string (302), is connected to the first low-voltage AC power bus (7), forming the first low-voltage energy storage peak-shaving power path. The second low-voltage AC power bus (8), connected to the first low-voltage AC power bus (7) via the electronic control switch (10) connected to the low-voltage AC power bus, is connected to the first air conditioner and AC power load (801) and the second air conditioner and AC power load (802), respectively, forming the power path for the first low-voltage access energy storage inverter (205) to provide power to the AC loads. At the same time, the first low-voltage AC power bus (7) The inverter (207) is connected to the first low-voltage DC power bus (12) and the second low-voltage DC power bus (13) connected by the electrical control switch (15) interconnected by the low-voltage DC power bus. The first low-voltage DC communication equipment (701), the first low-voltage DC protection and control equipment (702), the second low-voltage DC communication equipment (703), the second low-voltage DC protection and control equipment (704), and important DC power equipment (601) are connected to the inverter (207) via the low-voltage AC / DC bus. This forms a low-voltage DC power path for the first low-voltage access energy storage inverter (205) to provide power to the DC load. The second low-voltage access energy storage inverter (206), connected to the third battery string (303), is connected to the second low-voltage AC power bus (8), forming the second low-voltage energy storage peak-shaving power path. The first low-voltage AC power bus (7), connected to the second low-voltage AC power bus (8) via the low-voltage AC power bus-connected electronic control switch (10), is connected to the first air conditioner and AC power load (801) and the second air conditioner and AC power load (802), forming the power path for the second low-voltage access energy storage inverter (206) to provide power to the AC loads. At the same time, the second low-voltage AC power bus (8) is connected to the low-voltage AC power bus-connected electronic control switch (10). The first low-voltage AC power bus (7) connected to the inverter (207) is connected to the first low-voltage DC power bus (12) and the second low-voltage DC power bus (13) connected to the electrical control switch (15) interconnected by the low-voltage DC power bus. The first low-voltage DC communication equipment (701), the first low-voltage DC protection and control equipment (702), the second low-voltage DC communication equipment (703), the second low-voltage DC protection and control equipment (704), and important DC power equipment (601) are respectively connected to form the low-voltage DC power path for the second low-voltage access energy storage inverter (206) to provide power to the DC load. The low-voltage DC energy storage bidirectional DC / DC (401) connected to the low-voltage DC energy storage power supply battery string (501) is connected to important DC power equipment (601) and the second low-voltage DC power bus (13) connected through the first low-voltage DC power bus (12) and the electrical control switch (15) interconnected by the low-voltage DC power bus is respectively connected to the first low-voltage DC communication equipment (701), the first low-voltage DC protection and control equipment (702), the second low-voltage DC communication equipment (703), and the second low-voltage DC protection and control equipment (704), forming a low-voltage DC power path for the low-voltage DC energy storage bidirectional DC / DC (401) to provide power to DC loads. At the same time, the low-voltage DC energy storage bidirectional DC / DC (401) is connected to the first low-voltage DC power bus (12) to form a low-voltage DC energy storage peak-shaving power path. The medium-voltage DC bus DC / DC (403) of the energy storage battery string (502) connected to the medium-voltage DC bus DC / DC is connected to the medium-voltage DC equipment power supply DC / DC (402) and important DC electrical equipment (601), the DC power supply DC / DC (406) in the station and the auxiliary DC electrical load (603), the electrical control switch (14) connecting the medium-voltage DC bus to the charging pile and the medium-voltage DC charging pile (604) in sequence through the medium-voltage DC bus (11), forming a medium-voltage energy storage DC power path for the medium-voltage DC bus DC / DC (403) to provide power to the DC load. At the same time, the medium-voltage DC bus DC / DC (403) connected to the medium-voltage DC bus (11) forms a medium-voltage DC energy storage peak-shaving power path.

4. The power supply system based on AC / DC multi-microgrid architecture according to claim 2, wherein the first low-voltage level AC / DC microgrid is characterized in that: the first low-voltage access energy storage inverter (205) connected to the second battery string (302) is connected to the first air conditioner and AC power load (801) respectively through the first low-voltage AC power bus (7), and is connected to the dual-voltage level DC microgrid through the low-voltage AC / DC bus connected to the inverter (207), thereby forming the first low-voltage level AC / DC microgrid.

5. The power supply system based on AC / DC multi-microgrid architecture according to claim 2, wherein the second low-voltage level AC / DC microgrid is characterized in that: the second low-voltage access energy storage inverter (206) connected to the third battery string (303) is connected to the second air conditioner and AC power load (802) respectively through the second low-voltage AC power bus (8), and the control switch (10), the first low-voltage AC power bus (7) and the low-voltage AC / DC bus are connected to the inverter (207) to form a dual-voltage level DC microgrid, thereby constituting the second low-voltage level AC / DC microgrid.

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