An ac-dc microgrid system based on multi-power source power fusion

Abstract

The application belongs to the technical field of micro-grid, and particularly relates to an AC / DC micro-grid system based on multi-power supply power fusion. The innovative dynamic flexible system reconstruction technology is used to realize multi-voltage level, multi-power path, multi-power supply power fusion operation and multi-path power guarantee of power load, real-time dynamic adjustment and control are carried out on multiple independent and controlled interconnected multiple double-voltage level AC / DC micro-grids of multi-power supply power fusion, which provides effective guarantee of system architecture for effectively suppressing fluctuation of new energy power, completing planned and unplanned switching of multi-power supply and realizing seamless switching of multi-power supply, greatly improves stability and safety of system power supply, and effectively solves the problem that power grid, new energy distributed power, self-provided power plant, emergency power and the like need to be reasonably and effectively fused and operated and provide stable and reliable power for AC and DC loads of different voltage levels in a certain power consumption area.

Description

Technical Field

[0001] This invention belongs to the field of microgrid technology, specifically relating to an AC / DC microgrid system based on multi-source power integration. 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. Microgrids offer a flexible, efficient, safe, and economical power supply solution and are a key approach to vigorously developing new energy power applications. Within a given power consumption area, it is necessary to rationally and effectively integrate the power grid, distributed new 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 power demands are 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. Coupled with the widespread use of traditional AC power and the ever-expanding application of distributed new energy power, there is a need to construct hybrid AC / DC microgrid systems that integrate distributed new energy power with the existing power grid. Furthermore, safe, stable, economical, and reliable AC / DC power supply represents the technological trend of integrating new energy power with the power grid and rotor power.

[0003] A reasonable system configuration and scientific system architecture design of microgrids are essential to ensuring the satisfaction of users' power needs. This invention presents an AC / DC microgrid system based on multi-source power integration. Utilizing an innovative system architecture design, it ensures the integrated operation of multiple power sources. Through dynamic flexible system reconfiguration technology, it achieves integrated operation of multiple voltage levels, multiple power paths, and multiple power sources, as well as multiple power supply guarantees for power loads. Through real-time operation and management of the AC / DC microgrid system with multi-source power integration, it effectively mitigates fluctuations in renewable energy power and completes planned and unplanned switching of multiple power sources, as well as achieving seamless switching of multiple power sources, greatly improving the stability and security of power supply. Summary of the Invention

[0004] To achieve a safe, stable, economical, and reliable AC / DC hybrid microgrid system with integrated operation of multiple power sources, this invention specifically discloses an AC / DC microgrid system based on integrated operation of multiple power sources. A first power supply and a second power supply, powered by dual power sources, respectively form two independent and controlled interconnected dual-voltage-level AC microgrids via 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. These two dual-voltage-level AC microgrids are connected to a dual-voltage-level DC microgrid via inverters connected to the medium-high voltage AC bus and the medium-voltage DC bus, respectively, and inverters connected to the low-voltage DC bus and the low-voltage AC bus. The microgrid EMS central control system dynamically connects and controls various power devices, load devices, and electrical control switches through a communication network. The microgrid EMS central control system dynamically optimizes and constructs multiple AC and DC power paths, ensuring uninterrupted power supply for important loads with dual DC power supply, medium-voltage DC loads, low-voltage DC loads, and microgrid protection and control equipment. It also provides fast charging power for electric vehicles through medium-voltage DC charging piles.

[0005] The two independent and controlled interconnected dual-voltage-level AC microgrids are characterized as follows: A first power supply is connected to a first medium-high voltage AC power bus via a first power supply line control switch. This first medium-high voltage AC power bus connects to a medium-high voltage AC renewable energy generation grid-connected system and medium-high voltage AC power loads, and is connected via a second transformer to a low-voltage-level AC / DC microgrid with both power supply and load characteristics, formed by a low-voltage AC power bus. This constitutes two independent dual-level AC / DC microgrids based on the medium-high voltage AC bus. Simultaneously, a second power supply is connected to a second medium-high voltage AC power bus via a second power supply line control switch. This second medium-high voltage AC power bus connects to a rotor generator... The system connects to the medium- and high-voltage AC power bus via a connection control switch, forming a dual-voltage-level DC microgrid with both power supply and load characteristics. This microgrid consists of a medium- and high-voltage AC rotor power generation system connected to the medium- and high-voltage AC power bus via the first transformer, an inverter connected to the medium- and high-voltage AC power bus via the third transformer, and an inverter connected to the medium-voltage DC power bus via the third transformer. This forms another independent dual-level AC / DC microgrid based on the medium- and high-voltage AC power bus with two different voltage levels. The first and second medium- and high-voltage AC power buses are connected by a connection control switch between the medium- and high-voltage AC power buses, forming two independent and controlled interconnected dual-voltage-level AC microgrids.

[0006] The AC / DC microgrid management and control system is characterized by the following: the microgrid 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 connection control switch between the medium and high voltage AC power buses, the connection control switch for the rotor generator system connected to the medium and high voltage AC power bus, the connection control switch for the rotor generator system connected to the low voltage AC power bus, the control switch for the medium voltage DC bus connected to the charging pile, the medium and high voltage energy storage system inverter, the inverter connected between the medium and high voltage AC bus and the medium voltage DC bus, the inverter for new energy generation connected to the low voltage AC bus, the energy storage inverter connected to the low voltage AC bus, the inverter connected between the low voltage DC bus and the low voltage AC bus, the medium and high voltage AC energy storage battery string, the low voltage AC energy storage battery string, the medium voltage DC energy storage battery string, the low voltage DC dual-powered energy storage battery string, and the low voltage DC energy storage battery. The system comprises a multi-source power integration AC / DC microgrid system with a multi-microgrid architecture, including string and dual-channel DC power supply loads, low-voltage DC / DC power storage, medium-voltage DC / DC power supply loads, medium-voltage DC energy storage, DC / DC connecting medium-voltage and low-voltage DC buses, medium-voltage DC new energy power generation, low-voltage DC new energy power generation, low-voltage DC energy storage, medium- and high-voltage AC power loads, low-voltage AC power loads, important loads with dual-channel DC power supply, medium-voltage DC power loads, medium-voltage DC charging piles, low-voltage DC loads, microgrid protection and control equipment, medium- and high-voltage AC new energy power generation grid-connected systems, low-voltage AC new energy power generation systems, medium- and high-voltage DC new energy power generation systems, low-voltage DC new energy power generation systems, medium- and high-voltage AC rotor power generation systems, and low-voltage AC rotor power generation systems.

[0007] The aforementioned AC / DC microgrid system based on multi-source power integration, characterized by a dual-voltage-level DC microgrid, comprises: a medium-voltage DC power bus connecting medium-voltage DC loads and connected to corresponding important loads via a medium-voltage DC / DC converter, a medium-voltage DC energy storage DC / DC converter, a medium-voltage DC renewable energy generation DC / DC converter, an electronically controlled switch connecting the medium-voltage DC bus to a charging pile, a medium-voltage DC energy storage battery string, a medium-voltage DC renewable energy generation system, and a DC charging pile, forming a medium-voltage DC microgrid. Simultaneously, a low-voltage DC... The DC power bus is connected to low-voltage DC loads, microgrid protection and monitoring equipment, and low-voltage energy storage DC / DC converters connected to low-voltage DC dual-power storage battery strings via dual-power DC loads. It is also connected to low-voltage DC new energy power generation systems via low-voltage DC new energy power generation DC / DC converters and low-voltage DC storage battery strings via low-voltage DC energy storage DC / DC converters, thus forming a low-voltage DC microgrid. Furthermore, the DC / DC converters connecting the medium-voltage and low-voltage DC buses are connected to the medium-voltage DC power bus and the low-voltage DC power bus, thus forming a dual-voltage level DC microgrid.

[0008] The AC / DC microgrid system based on multi-power source integration is characterized by the following: the first power supply is connected to the first medium-high voltage AC power bus through the first power supply line control switch, and the first medium-high voltage AC power bus is connected to the medium-high voltage AC load, thus forming a power path in which the first power supply supplies power to the medium-high voltage AC load.

[0009] The first power supply is connected to the first medium-high voltage AC power bus via the first power supply line control switch. The first medium-high voltage AC power bus is connected to the low voltage AC power bus via the second transformer. The low voltage AC power bus is connected to the low voltage AC load, thus forming the power path from which the first power supply supplies power to the low voltage AC load.

[0010] The first power supply is connected to the first medium-high voltage AC power bus via the first power supply line control switch. The first medium-high voltage AC power bus is connected to the low voltage AC power bus via the second transformer. The low voltage AC power bus is connected to the low voltage DC power bus via an inverter connected to the low voltage DC power bus. The low voltage DC power bus is then connected to important DC dual-circuit power supply loads, low voltage DC loads, microgrid protection and measurement and control equipment. This constitutes the power path from which the first power supply provides power to important DC dual-circuit power supply loads, low voltage DC loads, microgrid protection and measurement and control equipment.

[0011] The first power supply is connected to the first medium-high voltage AC power bus via the first power supply line control switch. The first medium-high voltage AC power bus is connected to the second medium-high voltage AC power bus via the connection control switch between the medium-high voltage AC power buses. The second medium-high voltage AC power bus is connected to the medium-voltage DC power bus via the third transformer and the inverter that connects the medium-high voltage AC bus to the medium-voltage DC bus in sequence. This forms the power path for the first power supply to supply important loads with dual DC power supply, medium-voltage DC power loads, and medium-voltage DC charging piles.

[0012] The medium- and high-voltage AC new energy power generation grid-connected system is connected to the first medium- and high-voltage AC power bus, and the medium- and high-voltage AC power load is connected to the first medium- and high-voltage AC power bus, forming the power path for the medium- and high-voltage AC new energy power generation grid-connected system to supply power to the medium- and high-voltage AC power load;

[0013] The medium- and high-voltage AC new energy power generation grid-connected system is connected to the first medium- and high-voltage AC power bus. The first medium- and high-voltage AC power bus is connected to the low-voltage AC power bus through the second transformer. The low-voltage AC power bus is connected to the low-voltage AC power load, thus forming the power path for the medium- and high-voltage AC new energy power generation grid-connected system to supply power to the low-voltage AC power load.

[0014] The medium- and high-voltage AC new energy power generation grid-connected system is connected to the first medium- and high-voltage AC power bus. The first medium- and high-voltage AC power bus is connected to the low-voltage AC power bus through the second transformer. The low-voltage AC power bus is connected to the low-voltage DC power bus through an inverter connected to the low-voltage DC power bus. The low-voltage DC power bus is then connected to important loads with dual DC power supply, low-voltage DC loads, microgrid protection and monitoring and control equipment. This constitutes the power path for the medium- and high-voltage AC new energy power generation grid-connected system to supply power to important loads with dual DC power supply, low-voltage DC loads, microgrid protection and monitoring and control equipment.

[0015] The medium- and high-voltage AC new energy power generation grid-connected system is connected to the first medium- and high-voltage AC power bus. The first medium- and high-voltage AC power bus is connected to the second medium- and high-voltage AC power bus through the connecting control switch between the medium- and high-voltage AC power buses. The second medium- and high-voltage AC power bus is connected to the medium-voltage DC power bus through the third transformer, the inverter connecting the medium- and high-voltage AC bus to the medium-voltage DC bus, and the medium-voltage DC power bus to the medium-voltage DC load. At the same time, the medium-voltage DC charging pile is connected to the charging pile through the control switch connecting the medium-voltage DC bus to the charging pile. The medium-voltage DC / DC connection of the load with DC dual power supply is connected to the corresponding important load with DC dual power supply. This constitutes the power path of the medium- and high-voltage AC new energy power generation grid-connected system for supplying power to important loads with DC dual power supply, medium-voltage DC loads, and medium-voltage DC charging piles.

[0016] The second power supply is connected 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 is connected to the medium-voltage DC power bus via the third transformer, the inverter that connects the medium-high voltage AC bus to the medium-voltage DC power bus, and the medium-voltage DC power bus to the medium-voltage DC load. At the same time, the medium-voltage DC charging pile is connected to the charging pile via the control switch that connects the medium-voltage DC bus to the charging pile. The medium-voltage DC / DC converter connected to the corresponding important loads with dual DC power supply is also connected to the medium-voltage DC power supply load. This constitutes the power path of the second power supply for supplying power to the important loads with dual DC power supply, the medium-voltage DC loads, and the medium-voltage DC charging pile.

[0017] The second power supply is connected to the second medium-high voltage AC power bus via the power control switch of the second power supply line. The second medium-high voltage AC power bus is connected to the first medium-high voltage AC power bus via the connection control switch between the medium-high voltage AC power buses. The first medium-high voltage AC power bus is connected to the medium-high voltage AC power load, thus forming the power path for the second power supply to supply power to the medium-high voltage AC power load.

[0018] The second power supply is connected 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 is connected to the first medium-high voltage AC power bus via the connection control switch between the medium-high voltage AC power buses. The first medium-high voltage AC power bus is connected to the low-voltage AC power bus via the second transformer. The low-voltage AC power bus is connected to the low-voltage AC electrical load, thus forming the power path for the second power supply to supply power to the low-voltage AC electrical load.

[0019] The second power supply is connected 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 is connected to the first medium-high voltage AC power bus via the connection control switch between the medium-high voltage AC power buses. The first medium-high voltage AC power bus is connected to the low-voltage AC power bus via the second transformer. The low-voltage AC power bus is connected to the low-voltage DC power bus via an inverter connected to the low-voltage DC power bus. The low-voltage DC power bus is then connected to important DC dual-circuit power supply loads, low-voltage DC loads, microgrid protection and measurement and control equipment. This constitutes the power path from which the second power supply provides power to important DC dual-circuit power supply loads, low-voltage DC loads, microgrid protection and measurement and control equipment.

[0020] The medium- and high-voltage AC rotor power generation system connects to the second medium- and high-voltage AC power bus via a connecting control switch that connects the rotor power generation system to the medium- and high-voltage AC power bus. From the second medium- and high-voltage AC power bus, the system sequentially connects to the medium-voltage DC power bus via the third transformer and an inverter that connects the medium- and high-voltage AC bus to the medium-voltage DC power bus. The medium-voltage DC power bus then connects to the medium-voltage DC loads. Simultaneously, the system connects to the medium-voltage DC charging pile via a control switch that connects the medium-voltage DC bus to the charging pile. The system also connects to the corresponding important loads that are supplied by the dual-channel DC power supply through the medium-voltage DC / DC converter. This constitutes the power path from which the medium- and high-voltage AC rotor power generation system supplies power to the important loads that are supplied by the dual-channel DC power supply, the medium-voltage DC loads, and the medium-voltage DC charging piles.

[0021] The medium- and high-voltage AC rotor power generation system is connected to the second medium- and high-voltage AC power bus via a connecting control switch that connects the rotor power generation system to the medium- and high-voltage AC power bus. The second medium- and high-voltage AC power bus is connected to the first medium- and high-voltage AC power bus via a connecting control switch between the medium- and high-voltage AC power buses. The first medium- and high-voltage AC power bus is connected to the medium- and high-voltage AC power load, thus forming the power path for the medium- and high-voltage AC rotor power generation system to supply power to the medium- and high-voltage AC power load.

[0022] The medium- and high-voltage AC rotor power generation system is connected to the second medium- and high-voltage AC power bus via a connecting control switch that connects the rotor power generation system to the medium- and high-voltage AC power bus. The second medium- and high-voltage AC power bus is connected to the first medium- and high-voltage AC power bus via a connecting control switch between the medium- and high-voltage AC power buses. The first medium- and high-voltage AC power bus is connected to the low-voltage AC power bus via a second transformer. The low-voltage AC power bus is connected to the low-voltage AC electrical load, thus forming the power path for the medium- and high-voltage AC rotor power generation system to supply power to the low-voltage AC electrical load.

[0023] The medium- and high-voltage AC rotor power generation system connects to the second medium- and high-voltage AC power bus via a connecting control switch between the rotor power generation system and the medium- and high-voltage AC power bus. The second medium- and high-voltage AC power bus connects to the first medium- and high-voltage AC power bus via a connecting control switch between the medium- and high-voltage AC power buses. The first medium- and high-voltage AC power bus connects to the low-voltage AC power bus via a second transformer. The low-voltage AC power bus connects to the low-voltage DC power bus via an inverter connected to the low-voltage DC power bus. The low-voltage DC power bus then connects to important DC dual-power loads, low-voltage DC loads, microgrid protection and monitoring and control equipment. This constitutes the power path for the medium- and high-voltage AC rotor power generation system to supply power to important DC dual-power loads, low-voltage DC loads, microgrid protection and monitoring and control equipment.

[0024] The inverter of the medium- and high-voltage energy storage system is connected to the medium- and high-voltage AC energy storage battery string and then to the second medium- and high-voltage AC power bus via the first transformer. The second medium- and high-voltage AC power bus is connected to the medium-voltage DC power bus via the third transformer, the medium- and high-voltage AC bus, and the inverter is connected to the medium-voltage DC power bus. The medium-voltage DC power bus is connected to the medium-voltage DC load. At the same time, the medium-voltage DC charging pile is connected to the charging pile via the electronic control switch connected to the charging pile. The medium-voltage DC / DC converter connected to the corresponding important loads with dual DC power supply is also connected to the loads with dual DC power supply. This constitutes the power path for the inverter of the medium- and high-voltage energy storage system to supply power to the important loads with dual DC power supply, the medium-voltage DC loads, and the medium-voltage DC charging piles.

[0025] The inverter of the medium- and high-voltage energy storage system is connected to the medium- and high-voltage AC energy storage battery string and connected to the second medium- and high-voltage AC power bus through the first transformer. The second medium- and high-voltage AC power bus is connected to the first medium- and high-voltage AC power bus through the connection control switch between the medium- and high-voltage AC power buses. The first medium- and high-voltage AC power bus is connected to the medium- and high-voltage AC electrical load, thus forming the power path for the inverter of the medium- and high-voltage energy storage system to supply power to the medium- and high-voltage AC electrical load.

[0026] The inverter of the medium- and high-voltage energy storage system is connected to the medium- and high-voltage AC energy storage battery string and connected to the second medium- and high-voltage AC power bus through the first transformer. The second medium- and high-voltage AC power bus is connected to the first medium- and high-voltage AC power bus through the connection control switch between the medium- and high-voltage AC power buses. The first medium- and high-voltage AC power bus is connected to the low-voltage AC power bus through the second transformer. The low-voltage AC power bus is connected to the low-voltage AC electrical load, thus forming the power path for the inverter of the medium- and high-voltage energy storage system to supply power to the low-voltage AC electrical load.

[0027] The inverter of the medium-high voltage energy storage system is connected to the medium-high voltage AC energy storage battery string and connected to the second medium-high voltage AC power bus through the first transformer. The second medium-high voltage AC power bus is connected to the first medium-high voltage AC power bus through the connection control switch between the medium-high voltage AC power buses. The first medium-high voltage AC power bus is connected to the low-voltage AC power bus through the second transformer. The inverter connected to the low-voltage AC power bus through the low-voltage DC bus is connected to the low-voltage DC power bus. The low-voltage DC power bus is connected to the important loads with DC dual power supply, the low-voltage DC loads, and the microgrid protection and monitoring and control equipment. This constitutes the power path for the medium-high voltage energy storage system inverter to supply power to the important loads with DC dual power supply, the low-voltage DC loads, and the microgrid protection and monitoring and control equipment.

[0028] The inverter that connects to the low-voltage AC busbar of the new energy power generation system is connected to the low-voltage AC new energy power generation system and connected to the low-voltage AC power busbar. The low-voltage AC power busbar connects to the low-voltage AC power load, forming a power path for the low-voltage AC new energy power generation system to supply power to the low-voltage AC power load.

[0029] The inverter connected to the low-voltage AC bus of the new energy power generation system is connected to the low-voltage AC new energy power generation system and connected to the low-voltage AC power bus. The inverter connected to the low-voltage AC bus via the low-voltage DC bus is connected to the low-voltage DC power bus. The low-voltage DC power bus is then connected to important loads with dual DC power supply, low-voltage DC loads, microgrid protection and monitoring and control equipment. This forms the power path from which the low-voltage AC new energy power generation system supplies power to important loads with dual DC power supply, low-voltage DC loads, microgrid protection and monitoring and control equipment.

[0030] The energy storage inverter connected to the low-voltage AC bus is connected to the low-voltage AC energy storage battery pack in series and connected to the low-voltage AC power bus. The low-voltage AC power bus is connected to the low-voltage AC electrical load, forming a power path for the energy storage inverter connected to the low-voltage AC bus to supply power to the low-voltage AC electrical load.

[0031] The energy storage inverter connected to the low-voltage AC bus is connected to the low-voltage AC energy storage battery string and connected to the low-voltage AC power bus. The inverter connected to the low-voltage AC bus via the low-voltage DC bus is connected to the low-voltage DC power bus. The low-voltage DC power bus is then connected to important loads with dual DC power supply, low-voltage DC loads, microgrid protection and monitoring and control equipment. This forms the power path for the energy storage inverter connected to the low-voltage AC bus to supply power to important loads with dual DC power supply, low-voltage DC loads, microgrid protection and monitoring and control equipment.

[0032] The low-voltage AC rotor generator system is connected to the low-voltage AC power bus via a connecting electrical control switch. The low-voltage AC power bus then connects to the low-voltage AC load, forming the power path for the low-voltage AC rotor generator system to supply power to the low-voltage AC load.

[0033] The low-voltage AC rotor power generation system is connected to the low-voltage AC power bus via a connecting electrical control switch. The inverter, which is connected to the low-voltage DC power bus through the low-voltage DC power bus, is connected to the low-voltage DC power bus. The low-voltage DC power bus then connects to important loads with dual DC power supply, low-voltage DC loads, microgrid protection and monitoring and control equipment. This forms the power path for the low-voltage AC rotor power generation system to supply power to important loads with dual DC power supply, low-voltage DC loads, microgrid protection and monitoring and control equipment.

[0034] The medium-voltage DC new energy power generation system connects to the medium-voltage DC power bus via a medium-voltage DC new energy power generation DC / DC converter. The medium-voltage DC power bus connects to the medium-voltage DC power loads and, through the electrical control switch connected to the charging piles, connects to the medium-voltage DC charging piles. The medium-voltage DC / DC converter connected to the dual-channel DC power loads connects to the corresponding dual-channel DC power important loads. The DC / DC converter connecting the medium-voltage and low-voltage DC buses connects to the low-voltage DC power bus, and the low-voltage DC power bus connects to the dual-channel DC power important loads, low-voltage DC loads, microgrid protection and monitoring equipment. This constitutes the power path for the medium-voltage DC new energy power generation system to supply power to the dual-channel DC power important loads, medium-voltage DC power loads, medium-voltage DC charging piles, low-voltage DC loads, microgrid protection and monitoring equipment.

[0035] The medium-voltage DC energy storage DC / DC converter connects to the medium-voltage DC energy storage battery string and is connected to the medium-voltage DC power bus. The medium-voltage DC power bus connects to the medium-voltage DC power load and the charging pile. The medium-voltage DC charging pile is connected to the charging pile via the electrical control switch connected to the charging pile. The medium-voltage DC / DC converter connected to the load with dual DC power supply is connected to the corresponding important load with dual DC power supply. The DC / DC converter connected to the medium-voltage and low-voltage DC bus is connected to the low-voltage DC power bus and the important load with dual DC power supply, the low-voltage DC load, the microgrid protection and monitoring equipment are connected to the low-voltage DC power bus. This constitutes the power path of the medium-voltage DC new energy power generation system for supplying power to the important load with dual DC power supply, the medium-voltage DC power load, the medium-voltage DC charging pile, the low-voltage DC load, the microgrid protection and monitoring equipment.

[0036] The low-voltage energy storage DC / DC converter of the DC dual-powered load is connected to the low-voltage DC dual-powered energy storage battery string, which is simultaneously connected to the important DC dual-powered load and the low-voltage DC power bus. The low-voltage DC power bus connects to the low-voltage DC load, microgrid protection and monitoring and control equipment, thus forming the power path for the low-voltage energy storage DC / DC converter of the DC dual-powered load to supply power to the important DC dual-powered load, the low-voltage DC load, and the microgrid protection and monitoring and control equipment.

[0037] The low-voltage DC new energy power generation system connects the low-voltage DC new energy power generation DC / DC converter to the low-voltage DC power bus. The low-voltage DC power bus connects important loads with dual DC power supply, low-voltage DC loads, microgrid protection and monitoring and control equipment, thus forming the power path for the low-voltage DC new energy power generation system to supply power to important loads with dual DC power supply, low-voltage DC loads, microgrid protection and monitoring and control equipment.

[0038] The low-voltage DC energy storage battery string is connected to the low-voltage DC power bus via a low-voltage DC energy storage DC / DC converter. The low-voltage DC power bus connects to important loads with dual DC power supply, low-voltage DC loads, and microgrid protection and control equipment, forming a power path for the low-voltage DC energy storage DC / DC converter to supply power to important loads with dual DC power supply, low-voltage DC loads, and microgrid protection and control equipment.

[0039] The AC / DC microgrid system based on multi-source power integration is further characterized by the following: the first medium-high voltage AC power bus is connected to the second medium-high voltage AC power bus via a connecting control switch between the medium-high voltage AC power buses, and is connected to the medium-voltage DC power bus via the third transformer and an inverter connected to the medium-voltage DC power bus, thus forming the power path between the first medium-high voltage AC power bus and the second medium-high voltage AC power bus and the medium-voltage DC power bus;

[0040] Meanwhile, the first medium-high voltage AC power bus is connected to the second medium-high voltage AC power bus via the connecting control switch between the medium-high voltage AC power buses, and is connected to the low-voltage AC power bus via the second transformer, thus forming the power path between the first medium-high voltage AC power bus and the second medium-high voltage AC power bus and the low-voltage AC power bus;

[0041] The low-voltage AC power bus is connected to the low-voltage DC power bus via an inverter that is connected to the low-voltage DC power bus, thus forming a power path between the low-voltage AC power bus and the low-voltage DC power bus.

[0042] The medium-voltage DC power bus connects to the low-voltage DC power bus via a DC / DC converter that connects the medium-voltage and low-voltage DC buses, thus forming a power path between the medium-voltage DC power bus and the low-voltage DC power bus.

[0043] This invention discloses an AC / DC microgrid system based on multi-source power integration. Utilizing innovative dynamic flexible system reconfiguration technology, it achieves integrated operation of multiple voltage levels, multiple power paths, and multiple power sources, as well as multi-path power supply for loads. Through real-time dynamic adjustment and management of multiple independent and controlled interconnected dual-voltage-level AC / DC microgrids, it provides an effective system architecture guarantee for effectively mitigating fluctuations in renewable energy power, completing planned and unplanned switching of multiple power sources, and achieving seamless switching between multiple power sources. This significantly improves the stability and security of the system's power supply. It effectively solves the problem of rationally and effectively integrating the power grid, renewable distributed power, self-owned power plants, and emergency power sources within a certain power consumption area to provide stable and reliable power to AC and DC loads of different voltage levels. For the increasingly expanding application of renewable distributed power, it provides a solution for constructing a system that integrates renewable distributed power with rotor power and the existing power grid. The AC / DC hybrid microgrid system achieves safe, stable, economical, and reliable AC / DC power supply, representing a technological trend in the integration of renewable power with the power grid and rotor power. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of an AC / DC microgrid system based on multi-source power integration and its structure. Detailed Implementation

[0045] As an example, an AC / DC microgrid system based on multi-source power integration is described in conjunction with the accompanying drawings. However, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0046] like Figure 1 As shown, an AC / DC microgrid system based on multi-power source integration is described. A first power supply (1) and a second power supply (2) powered by dual power sources form two independent and controlled interconnected dual-voltage-level AC microgrids via two medium-high voltage AC power buses (3 and 4), respectively. The two dual-voltage-level AC microgrids are connected to the dual-voltage-level DC microgrid via inverters (202) connecting the medium-high voltage AC bus to the medium-voltage DC bus and inverters (205) connecting the low-voltage DC bus to the low-voltage AC bus. When the first power supply (1) and the second power supply (2) operate simultaneously and independently, the dual-voltage-level DC microgrid is treated as a unit with power supply and load characteristics, and its power and energy are comprehensively regulated and balanced. When one power supply (1) is supplying power and the other is not, the first medium-high voltage AC bus... The power bus (3) and the second medium-high voltage AC power bus (4) are connected as a dual-voltage level AC microgrid through the connection control switch (9) between the medium-high voltage AC power buses. The first power supply (1) and the second power supply (2) as well as other power generation systems and energy storage systems are controlled to switch on and off and complement each other. The microgrid EMS control system (15) dynamically connects and controls each power device, load device and control switch in real time through the communication network (8), forming a multi-power source AC and DC microgrid management and control system. The microgrid EMS control system (15) dynamically optimizes and constructs multiple AC and DC power paths, and provides power supply and uninterrupted power supply for important loads (601) and medium-voltage DC loads (602), low-voltage DC loads (701) and microgrid protection and measurement and control equipment (702) through the DC dual power supply. It also provides fast charging power for electric vehicles through medium-voltage DC charging piles (603), realizing intelligent management and optimization of grid source, load and storage.

[0047] The two independent and controlled interconnected dual-voltage-level AC microgrids 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), and the first medium-high voltage AC power bus (3) is connected to the medium-high voltage AC new energy power generation grid-connected system (801) and the medium-high voltage AC power load (501) respectively, and is connected to the low-voltage-level AC / DC microgrid with dual power supply and load characteristics by the low-voltage AC power bus (7) through the second transformer (102), thus forming two independent dual-level AC / DC microgrids with different voltage levels based on the medium-high voltage AC bus; 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 rotor power generation system respectively. The medium- and high-voltage AC rotor power generation system (901) connected to the medium- and high-voltage AC power bus via the connection control switch (10), the medium- and high-voltage energy storage system inverter (201) and the medium- and high-voltage AC energy storage battery string (301) connected sequentially via the first transformer (101), and the inverter (202) connected sequentially via the third transformer (103), the medium- and high-voltage AC bus and the medium-voltage DC bus, are connected to the medium-voltage DC power bus (12) to form a dual-voltage-level DC microgrid with dual power supply and load characteristics, forming another independent dual-level AC and DC microgrid based on the medium- and high-voltage AC bus with two different voltage levels, and the first medium- and high-voltage AC power bus (3) and the second medium- and high-voltage AC power bus (4) are connected by the connection control switch (9) between the medium- and high-voltage AC power buses, forming two independent and controlled interconnected dual-voltage-level AC microgrids.

[0048] The AC / DC microgrid management system is characterized by the following: the microgrid EMS central control system (15) is connected via a communication network (8) to the control switch (5) of the first power supply line, the control switch (6) of the second power supply line, the control switch (9) connecting the medium and high voltage AC power bus, the control switch (10) connecting the rotor generator system to the medium and high voltage AC power bus, the control switch (11) connecting the rotor generator system to the low voltage AC power bus, the control switch (14) connecting the medium voltage DC bus to the charging pile, and the inverter (20) of the medium and high voltage energy storage system. 1) Inverter connected to medium- and high-voltage AC bus and medium-voltage DC bus (202), inverter connected to low-voltage AC bus for new energy power generation (203), energy storage inverter connected to low-voltage AC bus (204), inverter connected to low-voltage DC bus and low-voltage AC bus (205), medium- and high-voltage AC energy storage battery string (301), low-voltage AC energy storage battery string (302), medium-voltage DC energy storage battery string (303), low-voltage DC dual-powered energy storage battery string (304), low-voltage DC energy storage battery string (305), DC dual-powered load Low-voltage energy storage DC / DC (401), medium-voltage DC / DC (402) for DC dual-powered loads, medium-voltage DC energy storage DC / DC (403), DC / DC connecting medium-voltage and low-voltage DC buses (404), medium-voltage DC new energy power generation DC / DC (405), low-voltage DC new energy power generation DC / DC (406), low-voltage DC energy storage DC / DC (407), medium- and high-voltage AC power loads (501), low-voltage AC power loads (502), important DC dual-powered loads (601), medium-voltage DC power loads (602). 02), medium-voltage DC charging pile (603), low-voltage DC load (701), microgrid protection and control equipment (702), medium-voltage AC new energy power generation grid-connected system (801), low-voltage AC new energy power generation system (802), medium-voltage DC new energy power generation system (803), low-voltage DC new energy power generation system (804), medium-voltage AC rotor power generation system (901), low-voltage AC rotor power generation system (902), constitute the energy management and operation control system of the multi-source power integration AC / DC microgrid system with AC / DC multi-microgrid architecture.

[0049] The AC / DC microgrid system based on multi-source power integration is characterized by the following: a medium-voltage DC power bus (12) connects to a medium-voltage DC power load (602), and the load is connected to a medium-voltage DC / DC converter (402), a medium-voltage DC energy storage DC / DC converter (403), a medium-voltage DC new energy power generation DC / DC converter (405), and an electrical control switch (14) connecting the medium-voltage DC bus to the charging pile. The switch connects to the corresponding important loads (601), medium-voltage DC energy storage battery string (303), medium-voltage DC new energy power generation system (803), and DC charging pile (604), forming a medium-voltage DC microgrid. Simultaneously, a low-voltage DC power bus... Line (13) is connected to the low-voltage DC load (701), the microgrid protection and control equipment (702), and the low-voltage DC / DC (401) which supplies power to the load via the DC dual-path power supply. It is connected to the low-voltage DC dual-path power supply energy storage battery string (304), the low-voltage DC new energy power generation DC / DC (406) which supplies power to the load via the DC dual-path power supply, and the low-voltage DC energy storage battery string (305) which supplies power to the load via the low-voltage DC new energy power generation DC / DC (406), thus forming a low-voltage DC microgrid. Furthermore, the DC / DC (404) which connects the medium-voltage and low-voltage DC bus is connected to the medium-voltage DC power bus (12) and the low-voltage DC power bus (13), thus forming a dual-voltage level DC microgrid.

[0050] The AC / DC microgrid system based on multi-power source integration is characterized by the following: 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), and the first medium-high voltage AC power bus (3) is connected to the medium-high voltage AC load (501), thus forming a power path in which the first power supply (1) supplies power to the medium-high voltage AC load (501);

[0051] 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 low voltage AC power bus (7) through the second transformer (102). The low voltage AC power bus (7) is connected to the low voltage AC load (502), thus forming the power path for the first power supply (1) to supply power to the low voltage AC load (502).

[0052] 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 low voltage AC power bus (7) through the second transformer (102). The low voltage AC power bus (7) is connected to the low voltage DC power bus (13) through the inverter (205) connected to the low voltage DC power bus. The low voltage DC power bus (13) is connected to the important DC dual-circuit power supply load (601), the low voltage DC load (701), and the microgrid protection and measurement and control equipment (702). This constitutes the power path of the first power supply (1) supplying power to the important DC dual-circuit power supply load (601), the low voltage DC load (701), and the microgrid protection and measurement and control equipment (702).

[0053] 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 second medium-high voltage AC power bus (4) through the connection control switch (9) between the medium-high voltage AC power buses. The second medium-high voltage AC power bus (4) is connected to the medium-voltage DC power bus (12) through the third transformer (103) and the inverter (202) that connects the medium-high voltage AC bus and the medium-voltage DC bus in sequence. This forms the power path for the first power supply (1) to supply power to the important load (601), the medium-voltage DC power load (602), and the medium-voltage DC charging pile (603) of the DC dual power supply.

[0054] The medium- and high-voltage AC new energy power generation grid-connected system (801) is connected to the first medium- and high-voltage AC power bus (3), and the medium- and high-voltage AC power load (501) is connected to the first medium- and high-voltage AC power bus (3), thus forming a power path for the medium- and high-voltage AC new energy power generation grid-connected system (801) to supply power to the medium- and high-voltage AC power load (501);

[0055] The medium- and high-voltage AC new energy power generation grid-connected system (801) is connected to the first medium- and high-voltage AC power bus (3), and the first medium- and high-voltage AC power bus (3) is connected to the low-voltage AC power bus (7) through the second transformer (102). The low-voltage AC power bus (7) is connected to the low-voltage AC power load (502), thus forming the power path for the medium- and high-voltage AC new energy power generation grid-connected system (801) to supply power to the low-voltage AC power load (502).

[0056] The medium- and high-voltage AC new energy power generation grid-connected system (801) is connected to the first medium- and high-voltage AC power bus (3). The first medium- and high-voltage AC power bus (3) is connected to the low-voltage AC power bus (7) through the second transformer (102). The low-voltage AC power bus (7) is connected to the low-voltage DC power bus (13) through the inverter (205) connected to the low-voltage DC power bus. The low-voltage DC power bus (13) is connected to the important DC dual-circuit power supply load (601), the low-voltage DC load (701), and the microgrid protection and measurement and control equipment (702). This constitutes the power path for the medium- and high-voltage AC new energy power generation grid-connected system (801) to supply power to the important DC dual-circuit power supply load (601), the low-voltage DC load (701), and the microgrid protection and measurement and control equipment (702).

[0057] The medium- and high-voltage AC new energy power generation grid-connected system (801) is connected to the first medium- and high-voltage AC power bus (3). The first medium- and high-voltage AC power bus (3) is connected to the second medium- and high-voltage AC power bus (4) through the connection control switch (9) between the medium- and high-voltage AC power buses. The second medium- and high-voltage AC power bus (4) is connected to the medium-voltage DC power bus (12) through the third transformer (103) and the inverter (202) that connects the medium- and high-voltage AC bus to the medium-voltage DC bus. The medium-voltage DC power bus (12) is connected to the medium-voltage DC power bus (12) through the inverter (202) that connects the medium- and high-voltage AC bus to the medium-voltage DC bus. 2) The medium-voltage DC power load (602) is connected to the charging pile via the electrical control switch (14) connected to the medium-voltage DC charging pile (603) and the medium-voltage DC / DC (402) connected to the corresponding important load (601) via the DC dual-circuit power supply load, thus forming the power path of the medium-voltage AC new energy power generation grid-connected system (801) to supply power to the important load (601), medium-voltage DC power load (602), and medium-voltage DC charging pile (603);

[0058] 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 medium-voltage DC power bus (12) through the third transformer (103) and the inverter (202) that connects the medium-high voltage AC bus to the medium-voltage DC bus. The medium-voltage DC power bus (12) is connected to the medium-voltage DC load (602). At the same time, the medium-voltage DC charging pile (603) is connected through the control switch (14) that connects the medium-voltage DC bus to the charging pile. The corresponding DC dual-circuit power supply important load (601) is connected through the medium-voltage DC / DC (402) of the DC dual-circuit power supply load. This constitutes the power path of the second power supply (2) for supplying power to the DC dual-circuit power supply important load (601), the medium-voltage DC load (602), and the medium-voltage DC charging pile (603).

[0059] 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 first medium-high voltage AC power bus (3) through the connection control switch (9) between the medium-high voltage AC power buses. The first medium-high voltage AC power bus (3) is connected to the medium-high voltage AC power load (501), thus forming the power path for the second power supply (2) to supply power to the medium-high voltage AC power load (501).

[0060] 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 first medium-high voltage AC power bus (3) through the connection control switch (9) between the medium-high voltage AC power buses. The first medium-high voltage AC power bus (3) is connected to the low voltage AC power bus (7) through the second transformer (102). The low voltage AC power bus (7) is connected to the low voltage AC load (502), thus forming the power path for the second power supply (2) to supply power to the low voltage AC load (502).

[0061] 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 first medium-high voltage AC power bus (3) through the connection control switch (9) between the medium-high voltage AC power buses. The first medium-high voltage AC power bus (3) is connected to the low voltage AC power bus (7) through the second transformer (102). The low voltage AC power bus (7) is connected to the low voltage DC power bus (13) through the inverter (205) connected to the low voltage DC power bus and the low voltage AC power bus. The low voltage DC power bus (13) is connected to the important DC dual-circuit power supply load (601), the low voltage DC load (701), and the microgrid protection and measurement and control equipment (702). This constitutes the power path of the second power supply (2) for supplying power to the important DC dual-circuit power supply load (601), the low voltage DC load (701), and the microgrid protection and measurement and control equipment (702).

[0062] The medium-high voltage AC rotor power generation system (901) is connected to the second medium-high voltage AC power bus (4) through the connection control switch (10) of the rotor power generation system to the medium-high voltage AC power bus. The second medium-high voltage AC power bus (4) is connected to the medium-voltage DC power bus (12) through the third transformer (103) and the inverter (202) that connects the medium-high voltage AC bus to the medium-voltage DC bus. The medium-voltage DC power bus (12) is connected to the medium-voltage DC load (602). At the same time, the medium-voltage DC charging pile (603) is connected to the charging pile through the control switch (14) that connects the medium-voltage DC bus to the charging pile. The medium-voltage DC / DC (402) that supplies the load with the DC dual power supply is connected to the corresponding important load with the DC dual power supply (601). This constitutes the power path of the medium-high voltage AC rotor power generation system (901) supplying the important load with the DC dual power supply (601), the medium-voltage DC load (602), and the medium-voltage DC charging pile (603).

[0063] The medium- and high-voltage AC rotor power generation system (901) is connected to the second medium- and high-voltage AC power bus (4) through the connection control switch (10) of the rotor power generation system to the medium- and high-voltage AC power bus. The second medium- and high-voltage AC power bus (4) is connected to the first medium- and high-voltage AC power bus (3) through the connection control switch (9) between the medium- and high-voltage AC power buses. The first medium- and high-voltage AC power bus (3) is connected to the medium- and high-voltage AC power load (501), thus forming the power path for the medium- and high-voltage AC rotor power generation system (901) to supply power to the medium- and high-voltage AC power load (501).

[0064] The medium- and high-voltage AC rotor power generation system (901) is connected to the second medium- and high-voltage AC power bus (4) through the connection control switch (10) of the rotor power generation system to the medium- and high-voltage AC power bus. The second medium- and high-voltage AC power bus (4) is connected to the first medium- and high-voltage AC power bus (3) through the connection control switch (9) between the medium- and high-voltage AC power buses. The first medium- and high-voltage AC power bus (3) is connected to the low-voltage AC power bus (7) through the second transformer (102). The low-voltage AC power bus (7) is connected to the low-voltage AC power load (502), thus forming the power path for the medium- and high-voltage AC rotor power generation system (901) to supply power to the low-voltage AC power load (502).

[0065] The medium-high voltage AC rotor power generation system (901) is connected to the second medium-high voltage AC power bus (4) via the connecting control switch (10) between the rotor power generation system and the medium-high voltage AC power bus. The second medium-high voltage AC power bus (4) is connected to the first medium-high voltage AC power bus (3) via the connecting control switch (9) between the medium-high voltage AC power buses. The first medium-high voltage AC power bus (3) is connected to the low-voltage AC power bus (7) via the second transformer (102). The low-voltage AC power bus (7) is connected to the first medium-high voltage AC power bus (3). The inverter (205) connected to the low-voltage DC bus and the low-voltage AC bus is connected to the low-voltage DC power bus (13) and connected to the important DC dual-power load (601), the low-voltage DC load (701), and the microgrid protection and control equipment (702) through the low-voltage DC power bus (13), thus forming the power path of the medium-high voltage AC rotor power generation system (901) to supply power to the important DC dual-power load (601), the low-voltage DC load (701), and the microgrid protection and control equipment (702);

[0066] The inverter (201) of the medium-high voltage energy storage system is connected to the medium-high voltage AC energy storage battery string (301) and connected to the second medium-high voltage AC power bus (4) through the first transformer (101). The second medium-high voltage AC power bus (4) is connected to the medium-voltage DC power bus (12) through the third transformer (103), the inverter (202) which is connected to the medium-voltage AC bus and the medium-voltage DC bus in sequence, and the medium-voltage DC power bus (12) is connected to the medium-voltage DC load (602). At the same time, the medium-voltage DC charging pile (603) is connected to the charging pile through the electronic control switch (14) connected to the charging pile through the medium-voltage DC bus. The medium-voltage DC / DC (402) connected to the DC dual-circuit power supply load is connected to the corresponding DC dual-circuit power supply important load (601). This constitutes the power path of the medium-high voltage energy storage system inverter (201) supplying power to the DC dual-circuit power supply important load (601), the medium-voltage DC load (602), and the medium-voltage DC charging pile (603).

[0067] The medium- and high-voltage energy storage system inverter (201) is connected to the medium- and high-voltage AC energy storage battery string (301) and connected to the second medium- and high-voltage AC power bus (4) through the first transformer (101). The second medium- and high-voltage AC power bus (4) is connected to the first medium- and high-voltage AC power bus (3) through the connection control switch (9) between the medium- and high-voltage AC power buses. The first medium- and high-voltage AC power bus (3) is connected to the medium- and high-voltage AC power load (501), thus forming the power path for the medium- and high-voltage energy storage system inverter (201) to supply power to the medium- and high-voltage AC power load (501).

[0068] The medium-high voltage energy storage system inverter (201) is connected to the medium-high voltage AC energy storage battery string (301) and connected to the second medium-high voltage AC power bus (4) through the first transformer (101). The second medium-high voltage AC power bus (4) is connected to the first medium-high voltage AC power bus (3) through the connection control switch (9) between the medium-high voltage AC power buses. The first medium-high voltage AC power bus (3) is connected to the low-voltage AC power bus (7) through the second transformer (102). The low-voltage AC power bus (7) is connected to the low-voltage AC power load (502), thus forming the power path for the medium-high voltage energy storage system inverter (201) to supply power to the low-voltage AC power load (502).

[0069] The inverter (201) of the medium-high voltage energy storage system is connected to the medium-high voltage AC energy storage battery string (301) and connected to the second medium-high voltage AC power bus (4) through the first transformer (101). The second medium-high voltage AC power bus (4) is connected to the first medium-high voltage AC power bus (3) through the connection control switch (9) between the medium-high voltage AC power buses. The first medium-high voltage AC power bus (3) is connected to the low-voltage AC power bus (7) through the second transformer (102). The low-voltage AC power bus (7) is connected to the low-voltage AC power bus. The inverter (205) connected to the low-voltage DC bus and the low-voltage AC bus is connected to the low-voltage DC power bus (13) and connected to the important load (601) with DC dual power supply, the low-voltage DC load (701) and the microgrid protection and control equipment (702) through the low-voltage DC power bus (13), thus forming the power path for the inverter (201) of the medium- and high-voltage energy storage system to supply power to the important load (601) with DC dual power supply, the low-voltage DC load (701) and the microgrid protection and control equipment (702);

[0070] The inverter (203) that connects to the low-voltage AC busbar of the new energy power generation system is connected to the low-voltage AC new energy power generation system (802) and connected to the low-voltage AC power busbar (7). The low-voltage AC power busbar (7) connects to the low-voltage AC power load (502), forming a power path for the low-voltage AC new energy power generation system (802) to supply power to the low-voltage AC power load (502).

[0071] The inverter (203) that connects to the low-voltage AC bus is connected to the low-voltage AC new energy power generation system (802) and connected to the low-voltage AC power bus (7). The inverter (205) that is connected to the low-voltage AC bus via the low-voltage DC bus is connected to the low-voltage DC power bus (13). The low-voltage DC power bus (13) connects to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and control equipment (702). This forms the power path from which the low-voltage AC new energy power generation system (802) supplies power to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and control equipment (702).

[0072] The energy storage inverter (204) connected to the low-voltage AC bus is connected to the low-voltage AC energy storage battery string (302) and connected to the low-voltage AC power bus (7). The low-voltage AC power bus (7) is connected to the low-voltage AC power load (502), forming a power path for the energy storage inverter (204) connected to the low-voltage AC bus to supply power to the low-voltage AC power load (502).

[0073] The energy storage inverter (204) connected to the low-voltage AC bus is connected to the low-voltage AC energy storage battery string (302) and connected to the low-voltage AC power bus (7). The inverter (205) connected to the low-voltage AC bus via the low-voltage AC bus (7) is connected to the low-voltage DC power bus (13). The low-voltage DC power bus (13) is connected to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and measurement and control equipment (702). This forms the power path for the energy storage inverter (204) connected to the low-voltage AC bus to supply power to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and measurement and control equipment (702).

[0074] The low-voltage AC rotor power generation system (902) is connected to the low-voltage AC power bus (7) through the connection control switch (11) of the rotor power generation system to the low-voltage AC power bus. The low-voltage AC power bus (7) is connected to the low-voltage AC power load (502), forming a power path for the low-voltage AC rotor power generation system (902) to supply power to the low-voltage AC power load (502).

[0075] The low-voltage AC rotor power generation system (902) is connected to the low-voltage AC power bus (7) through the connection control switch (11) of the rotor power generation system. The low-voltage AC power bus (7) is connected to the low-voltage DC power bus (13) through the inverter (205) connected to the low-voltage DC power bus. The low-voltage DC power bus (13) is connected to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and measurement and control equipment (702). This forms the power path for the low-voltage AC rotor power generation system (902) to supply power to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and measurement and control equipment (702).

[0076] The medium-voltage DC new energy power generation system (803) is connected to the medium-voltage DC power bus (12) via the medium-voltage DC new energy power generation DC / DC (405). The medium-voltage DC power bus (12) connects to the medium-voltage DC power load (602). At the same time, the medium-voltage DC charging pile (603) is connected to the charging pile via the electrical control switch (14) connected to the charging pile via the medium-voltage DC bus. The corresponding important loads (601) are connected via the medium-voltage DC / DC (402) that supply the load through the DC dual-path power supply. The DC / DC (402) that connects the medium-voltage and low-voltage DC buses is also connected to the charging pile. DC (404) is connected to the low-voltage DC power bus (13) and the low-voltage DC power bus (13) is connected to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and control equipment (702), forming the power path of the medium-voltage DC new energy power generation system (803) to supply power to the important load (601) with DC dual power supply, the medium-voltage DC load (602), the medium-voltage DC charging pile (603), the low-voltage DC load (701), and the microgrid protection and control equipment (702);

[0077] The medium-voltage DC energy storage DC / DC converter (403) is connected to the medium-voltage DC energy storage battery string (303) and connected to the medium-voltage DC power bus (12). The medium-voltage DC power bus (12) is connected to the medium-voltage DC power load (602). At the same time, the medium-voltage DC charging pile (603) is connected to the charging pile through the electrical control switch (14) connected to the charging pile via the medium-voltage DC bus. The medium-voltage DC / DC converter (402) connected to the load via the DC dual-circuit power supply is connected to the corresponding important load (601) via the DC dual-circuit power supply and the DC / DC converter connected to the medium-voltage and low-voltage DC buses. (404) Connect the low-voltage DC power bus (13) and connect the important DC dual-circuit power supply load (601), low-voltage DC load (701), and microgrid protection and control equipment (702) to the low-voltage DC power bus (13), forming a power path for the medium-voltage DC new energy power generation system (803) to supply power to the important DC dual-circuit power supply load (601), medium-voltage DC power load (602), medium-voltage DC charging pile (603), low-voltage DC load (701), and microgrid protection and control equipment (702);

[0078] The low-voltage energy storage DC / DC (401) of the DC dual-powered load is connected to the low-voltage DC dual-powered energy storage battery string (304) and simultaneously connected to the important DC dual-powered load (601) and the low-voltage DC power bus (13). The low-voltage DC load (701) and the microgrid protection and control equipment (702) are connected by the low-voltage DC power bus (13), thus forming the power path for the low-voltage energy storage DC / DC (401) of the DC dual-powered load to supply power to the important DC dual-powered load (601), the low-voltage DC load (701), and the microgrid protection and control equipment (702).

[0079] The low-voltage DC new energy power generation system (804) is connected to the low-voltage DC power bus (13) through the low-voltage DC new energy power generation DC / DC (406). The low-voltage DC power bus (13) connects the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and control equipment (702), thus forming the power path for the low-voltage DC new energy power generation system (804) to supply power to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and control equipment (702).

[0080] The low-voltage DC energy storage battery string (305) is connected to the low-voltage DC power bus (13) through the low-voltage DC energy storage DC / DC (407). The low-voltage DC power bus (13) connects to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and control equipment (702), thus forming a power path for the low-voltage DC energy storage DC / DC (407) to supply power to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and control equipment (702).

[0081] The AC / DC microgrid system based on multi-power source integration is characterized by the following: the first medium-high voltage AC power bus (3) is connected to the second medium-high voltage AC power bus (4) via the connecting control switch (9) between the medium-high voltage AC power buses, and is connected to the medium-voltage DC power bus (12) via the third transformer (103) and the inverter (202) connecting the medium-high voltage AC power bus and the medium-voltage DC power bus, thus forming the power path between the first medium-high voltage AC power bus (3) and the second medium-high voltage AC power bus (4) and the medium-voltage DC power bus (12);

[0082] At the same time, the first medium-high voltage AC power bus (3) is connected to the second medium-high voltage AC power bus (4) through the connecting control switch (9) between the medium-high voltage AC power buses, and is connected to the low voltage AC power bus (7) through the second transformer (102), thus forming the power path between the first medium-high voltage AC power bus (3) and the second medium-high voltage AC power bus (4) and the low voltage AC power bus (7);

[0083] The low-voltage AC power bus (7) is connected to the low-voltage DC power bus (13) through the inverter (205) that is connected to the low-voltage DC power bus, forming a power path between the low-voltage AC power bus (7) and the low-voltage DC power bus (13).

[0084] The medium-voltage DC power bus (12) is connected to the low-voltage DC power bus (13) through the DC / DC (404) connecting the medium-voltage and low-voltage DC buses, thus forming a power path between the medium-voltage DC power bus (12) and the low-voltage DC power bus (13).

[0085] This invention discloses an AC / DC microgrid system based on multi-source power integration. Utilizing innovative dynamic flexible system reconfiguration technology, it achieves integrated operation of multiple voltage levels, multiple power paths, and multiple power sources, as well as multi-path power supply for loads. Through real-time dynamic adjustment and management of multiple independent and controlled interconnected dual-voltage-level AC / DC microgrids, it provides an effective system architecture guarantee for effectively mitigating fluctuations in renewable energy power, completing planned and unplanned switching of multiple power sources, and achieving seamless switching between multiple power sources. This significantly improves the stability and security of the system's power supply. It effectively solves the problem of rationally and effectively integrating the power grid, renewable distributed power, self-owned power plants, and emergency power sources within a certain power consumption area to provide stable and reliable power to AC and DC loads of different voltage levels. For the increasingly expanding application of renewable distributed power, it provides a solution for constructing a system that integrates renewable distributed power with rotor power and the existing power grid. The AC / DC hybrid microgrid system achieves safe, stable, economical, and reliable AC / DC power supply, representing a technological trend in the integration of renewable power with the power grid and rotor power.

Claims

1. A multi-power source AC / DC microgrid system, wherein a first power supply (1) and a second power supply (2) powered by dual power sources respectively form two independent and controlled interconnected dual-voltage-level AC microgrids through two sections of medium- and high-voltage AC power buses (3 and 4), and the two dual-voltage-level AC microgrids are connected to a dual-voltage-level DC microgrid through inverters (202) connected to the medium- and high-voltage AC bus and inverters (205) connected to the low-voltage DC bus and the low-voltage AC bus, respectively. The microgrid EMS central control system (15) dynamically connects and controls various power devices, load devices and electrical control switches through the communication network (8). The microgrid EMS central control system (15) dynamically optimizes and constructs multiple AC and DC power paths, and provides power and uninterrupted power supply for medium and high voltage AC loads (501), low voltage AC loads (502), important DC dual-circuit power supply loads (601), medium voltage DC loads (602), low voltage DC loads (701), and microgrid protection and measurement and control equipment (702). It also provides fast charging power for electric vehicles through medium voltage DC charging piles (603). The two independent and controlled interconnected dual-voltage-level AC microgrids 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), and the first medium-high voltage AC power bus (3) is connected to the medium-high voltage AC new energy power generation grid-connected system (801) and the medium-high voltage AC power load (501) respectively, and is connected to the low-voltage-level AC / DC microgrid with dual power supply and load characteristics by the low-voltage AC power bus (7) through the second transformer (102), thus forming two independent dual-level AC / DC microgrids with different voltage levels based on the medium-high voltage AC bus; 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 rotor power generation system respectively. The medium- and high-voltage AC rotor power generation system (901) connected to the medium- and high-voltage AC power bus via the connection control switch (10) and the medium- and high-voltage energy storage system inverter (201) and medium- and high-voltage AC energy storage battery string (301) connected sequentially via the first transformer (101), and the inverter (202) connected sequentially via the third transformer (103), the medium- and high-voltage AC bus and the medium-voltage DC bus, are connected to the medium-voltage DC power bus (12) to form a dual-voltage-level DC microgrid with dual characteristics of power supply and load, forming another independent dual-level AC and DC microgrid based on two different voltage levels of the medium- and high-voltage AC bus, and the first medium- and high-voltage AC power bus (3) and the second medium- and high-voltage AC power bus (4) are connected by the connection control switch (9) between the medium- and high-voltage AC power buses to form an independent and controlled interconnected dual-voltage-level AC microgrid; The AC / DC microgrid management system is characterized by the following: the microgrid EMS central control system (15) is connected via a communication network (8) to the control switch (5) of the first power supply line, the control switch (6) of the second power supply line, the control switch (9) connecting the medium and high voltage AC power bus, the control switch (10) connecting the rotor generator system to the medium and high voltage AC power bus, the control switch (11) connecting the rotor generator system to the low voltage AC power bus, the control switch (14) connecting the medium voltage DC bus to the charging pile, and the inverter (20) of the medium and high voltage energy storage system. 1) Inverter connected to medium- and high-voltage AC bus and medium-voltage DC bus (202), inverter connected to low-voltage AC bus for new energy power generation (203), energy storage inverter connected to low-voltage AC bus (204), inverter connected to low-voltage DC bus and low-voltage AC bus (205), medium- and high-voltage AC energy storage battery string (301), low-voltage AC energy storage battery string (302), medium-voltage DC energy storage battery string (303), low-voltage DC dual-powered energy storage battery string (304), low-voltage DC energy storage battery string (305), DC dual-powered load Low-voltage energy storage DC / DC (401), medium-voltage DC / DC (402) for DC dual-powered loads, medium-voltage DC energy storage DC / DC (403), DC / DC connecting medium-voltage and low-voltage DC buses (404), medium-voltage DC new energy power generation DC / DC (405), low-voltage DC new energy power generation DC / DC (406), low-voltage DC energy storage DC / DC (407), medium- and high-voltage AC power loads (501), low-voltage AC power loads (502), important DC dual-powered loads (601), medium-voltage DC power loads (602). 02), medium-voltage DC charging pile (603), low-voltage DC load (701), microgrid protection and control equipment (702), medium-voltage AC new energy power generation grid-connected system (801), low-voltage AC new energy power generation system (802), medium-voltage DC new energy power generation system (803), low-voltage DC new energy power generation system (804), medium-voltage AC rotor power generation system (901), low-voltage AC rotor power generation system (902), constitute the energy management and operation control system of the multi-source power integration AC / DC microgrid system with AC / DC multi-microgrid architecture.

2. According to claim 1, the AC / DC microgrid system based on multi-source power integration is characterized in that: a medium-voltage DC power bus (12) is connected to a medium-voltage DC power load (602), and the load is connected to a medium-voltage DC / DC converter (402), a medium-voltage DC energy storage DC / DC converter (403), a medium-voltage DC new energy power generation DC / DC converter (405), and an electronic control switch (14) connecting the medium-voltage DC bus to the charging pile, respectively, to the corresponding important loads (601), medium-voltage DC energy storage battery string (303), medium-voltage DC new energy power generation system (803), and DC charging pile (604), forming a medium-voltage DC microgrid. At the same time, a low-voltage DC power bus is connected to the medium-voltage DC power load (601), a medium-voltage DC energy storage battery string (303), a medium-voltage DC new energy power generation system (803), and a DC charging pile (604), forming a medium-voltage DC microgrid. The DC power bus (13) is connected to the low-voltage DC load (701), the microgrid protection and measurement and control equipment (702), and the low-voltage energy storage DC / DC (401) connected to the low-voltage DC dual-power energy storage battery string (304) through the DC dual-power load, the low-voltage DC new energy power generation DC / DC (406) connected to the low-voltage DC new energy power generation system (804), and the low-voltage DC energy storage DC / DC (407) connected to the low-voltage DC energy storage battery string (305), thus forming a low-voltage DC microgrid; and the DC / DC (404) connecting the medium-voltage and low-voltage DC buses is connected to the medium-voltage DC power bus (12) and the low-voltage DC power bus (13), thus forming a dual-voltage level DC microgrid.

3. According to claim 1, the AC and DC multi-power paths of the AC and DC multi-power paths are characterized in that: 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), and the first medium-high voltage AC power bus (3) is connected to the medium-high voltage AC load (501), thus forming a power path in which the first power supply (1) supplies power to the medium-high voltage AC load (501); 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 low voltage AC power bus (7) through the second transformer (102). The low voltage AC power bus (7) is connected to the low voltage AC load (502), thus forming the power path for the first power supply (1) to supply power to the low voltage AC load (502). 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 low voltage AC power bus (7) through the second transformer (102). The low voltage AC power bus (7) is connected to the low voltage DC power bus (13) through the inverter (205) connected to the low voltage DC power bus. The low voltage DC power bus (13) is connected to the important DC dual-circuit power supply load (601), the low voltage DC load (701), and the microgrid protection and measurement and control equipment (702). This constitutes the power path of the first power supply (1) supplying power to the important DC dual-circuit power supply load (601), the low voltage DC load (701), and the microgrid protection and measurement and control equipment (702). 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 second medium-high voltage AC power bus (4) through the connection control switch (9) between the medium-high voltage AC power buses. The second medium-high voltage AC power bus (4) is connected to the medium-voltage DC power bus (12) through the third transformer (103) and the inverter (202) that connects the medium-high voltage AC bus and the medium-voltage DC bus in sequence. This forms the power path for the first power supply (1) to supply power to the important load (601), the medium-voltage DC power load (602), and the medium-voltage DC charging pile (603) of the DC dual power supply. The medium- and high-voltage AC new energy power generation grid-connected system (801) is connected to the first medium- and high-voltage AC power bus (3), and the medium- and high-voltage AC power load (501) is connected to the first medium- and high-voltage AC power bus (3), thus forming a power path for the medium- and high-voltage AC new energy power generation grid-connected system (801) to supply power to the medium- and high-voltage AC power load (501); The medium- and high-voltage AC new energy power generation grid-connected system (801) is connected to the first medium- and high-voltage AC power bus (3), and the first medium- and high-voltage AC power bus (3) is connected to the low-voltage AC power bus (7) through the second transformer (102). The low-voltage AC power bus (7) is connected to the low-voltage AC power load (502), thus forming the power path for the medium- and high-voltage AC new energy power generation grid-connected system (801) to supply power to the low-voltage AC power load (502). The medium- and high-voltage AC new energy power generation grid-connected system (801) is connected to the first medium- and high-voltage AC power bus (3). The first medium- and high-voltage AC power bus (3) is connected to the low-voltage AC power bus (7) through the second transformer (102). The low-voltage AC power bus (7) is connected to the low-voltage DC power bus (13) through the inverter (205) connected to the low-voltage DC power bus. The low-voltage DC power bus (13) is connected to the important DC dual-circuit power supply load (601), the low-voltage DC load (701), and the microgrid protection and measurement and control equipment (702). This constitutes the power path for the medium- and high-voltage AC new energy power generation grid-connected system (801) to supply power to the important DC dual-circuit power supply load (601), the low-voltage DC load (701), and the microgrid protection and measurement and control equipment (702). The medium- and high-voltage AC new energy power generation grid-connected system (801) is connected to the first medium- and high-voltage AC power bus (3). The first medium- and high-voltage AC power bus (3) is connected to the second medium- and high-voltage AC power bus (4) through the connection control switch (9) between the medium- and high-voltage AC power buses. The second medium- and high-voltage AC power bus (4) is connected to the medium-voltage DC power bus (12) through the third transformer (103) and the inverter (202) that connects the medium- and high-voltage AC bus to the medium-voltage DC bus. The medium-voltage DC power bus (12) is connected to the medium-voltage DC power bus (12) through the inverter (202) that connects the medium- and high-voltage AC bus to the medium-voltage DC bus. 2) The medium-voltage DC power load (602) is connected to the charging pile via the electrical control switch (14) connected to the medium-voltage DC charging pile (603) and the medium-voltage DC / DC (402) connected to the corresponding important load (601) via the DC dual-circuit power supply load, thus forming the power path of the medium-voltage AC new energy power generation grid-connected system (801) to supply power to the important load (601), medium-voltage DC power load (602), and medium-voltage DC charging pile (603); 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 medium-voltage DC power bus (12) through the third transformer (103) and the inverter (202) that connects the medium-high voltage AC bus to the medium-voltage DC bus. The medium-voltage DC power bus (12) is connected to the medium-voltage DC load (602). At the same time, the medium-voltage DC charging pile (603) is connected through the control switch (14) that connects the medium-voltage DC bus to the charging pile. The corresponding DC dual-circuit power supply important load (601) is connected through the medium-voltage DC / DC (402) of the DC dual-circuit power supply load. This constitutes the power path of the second power supply (2) for supplying power to the DC dual-circuit power supply important load (601), the medium-voltage DC load (602), and the medium-voltage DC charging pile (603). 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 first medium-high voltage AC power bus (3) through the connection control switch (9) between the medium-high voltage AC power buses. The first medium-high voltage AC power bus (3) is connected to the medium-high voltage AC power load (501), thus forming the power path for the second power supply (2) to supply power to the medium-high voltage AC power load (501). 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 first medium-high voltage AC power bus (3) through the connection control switch (9) between the medium-high voltage AC power buses. The first medium-high voltage AC power bus (3) is connected to the low voltage AC power bus (7) through the second transformer (102). The low voltage AC power bus (7) is connected to the low voltage AC load (502), thus forming the power path for the second power supply (2) to supply power to the low voltage AC load (502). 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 first medium-high voltage AC power bus (3) through the connection control switch (9) between the medium-high voltage AC power buses. The first medium-high voltage AC power bus (3) is connected to the low voltage AC power bus (7) through the second transformer (102). The low voltage AC power bus (7) is connected to the low voltage DC power bus (13) through the inverter (205) connected to the low voltage DC power bus and the low voltage AC power bus. The low voltage DC power bus (13) is connected to the important DC dual-circuit power supply load (601), the low voltage DC load (701), and the microgrid protection and measurement and control equipment (702). This constitutes the power path of the second power supply (2) for supplying power to the important DC dual-circuit power supply load (601), the low voltage DC load (701), and the microgrid protection and measurement and control equipment (702). The medium-high voltage AC rotor power generation system (901) is connected to the second medium-high voltage AC power bus (4) through the connection control switch (10) of the rotor power generation system to the medium-high voltage AC power bus. The second medium-high voltage AC power bus (4) is connected to the medium-voltage DC power bus (12) through the third transformer (103) and the inverter (202) that connects the medium-high voltage AC bus to the medium-voltage DC bus. The medium-voltage DC power bus (12) is connected to the medium-voltage DC load (602). At the same time, the medium-voltage DC charging pile (603) is connected to the charging pile through the control switch (14) that connects the medium-voltage DC bus to the charging pile. The medium-voltage DC / DC (402) that supplies the load with the DC dual power supply is connected to the corresponding important load with the DC dual power supply (601). This constitutes the power path of the medium-high voltage AC rotor power generation system (901) supplying the important load with the DC dual power supply (601), the medium-voltage DC load (602), and the medium-voltage DC charging pile (603). The medium- and high-voltage AC rotor power generation system (901) is connected to the second medium- and high-voltage AC power bus (4) through the connection control switch (10) of the rotor power generation system to the medium- and high-voltage AC power bus. The second medium- and high-voltage AC power bus (4) is connected to the first medium- and high-voltage AC power bus (3) through the connection control switch (9) between the medium- and high-voltage AC power buses. The first medium- and high-voltage AC power bus (3) is connected to the medium- and high-voltage AC power load (501), thus forming the power path for the medium- and high-voltage AC rotor power generation system (901) to supply power to the medium- and high-voltage AC power load (501). The medium- and high-voltage AC rotor power generation system (901) is connected to the second medium- and high-voltage AC power bus (4) through the connection control switch (10) of the rotor power generation system to the medium- and high-voltage AC power bus. The second medium- and high-voltage AC power bus (4) is connected to the first medium- and high-voltage AC power bus (3) through the connection control switch (9) between the medium- and high-voltage AC power buses. The first medium- and high-voltage AC power bus (3) is connected to the low-voltage AC power bus (7) through the second transformer (102). The low-voltage AC power bus (7) is connected to the low-voltage AC power load (502), thus forming the power path for the medium- and high-voltage AC rotor power generation system (901) to supply power to the low-voltage AC power load (502). The medium-high voltage AC rotor power generation system (901) is connected to the second medium-high voltage AC power bus (4) via the connecting control switch (10) between the rotor power generation system and the medium-high voltage AC power bus. The second medium-high voltage AC power bus (4) is connected to the first medium-high voltage AC power bus (3) via the connecting control switch (9) between the medium-high voltage AC power buses. The first medium-high voltage AC power bus (3) is connected to the low-voltage AC power bus (7) via the second transformer (102). The low-voltage AC power bus (7) is connected to the first medium-high voltage AC power bus (3). The inverter (205) connected to the low-voltage DC bus and the low-voltage AC bus is connected to the low-voltage DC power bus (13) and connected to the important DC dual-power load (601), the low-voltage DC load (701), and the microgrid protection and control equipment (702) through the low-voltage DC power bus (13), thus forming the power path of the medium-high voltage AC rotor power generation system (901) to supply power to the important DC dual-power load (601), the low-voltage DC load (701), and the microgrid protection and control equipment (702); The inverter (201) of the medium-high voltage energy storage system is connected to the medium-high voltage AC energy storage battery string (301) and connected to the second medium-high voltage AC power bus (4) through the first transformer (101). The second medium-high voltage AC power bus (4) is connected to the medium-voltage DC power bus (12) through the third transformer (103), the inverter (202) which is connected to the medium-voltage AC bus and the medium-voltage DC bus in sequence, and the medium-voltage DC power bus (12) is connected to the medium-voltage DC load (602). At the same time, the medium-voltage DC charging pile (603) is connected to the charging pile through the electronic control switch (14) connected to the charging pile through the medium-voltage DC bus. The medium-voltage DC / DC (402) connected to the DC dual-circuit power supply load is connected to the corresponding DC dual-circuit power supply important load (601). This constitutes the power path of the medium-high voltage energy storage system inverter (201) supplying power to the DC dual-circuit power supply important load (601), the medium-voltage DC load (602), and the medium-voltage DC charging pile (603). The medium- and high-voltage energy storage system inverter (201) is connected to the medium- and high-voltage AC energy storage battery string (301) and connected to the second medium- and high-voltage AC power bus (4) through the first transformer (101). The second medium- and high-voltage AC power bus (4) is connected to the first medium- and high-voltage AC power bus (3) through the connection control switch (9) between the medium- and high-voltage AC power buses. The first medium- and high-voltage AC power bus (3) is connected to the medium- and high-voltage AC power load (501), thus forming the power path for the medium- and high-voltage energy storage system inverter (201) to supply power to the medium- and high-voltage AC power load (501). The medium-high voltage energy storage system inverter (201) is connected to the medium-high voltage AC energy storage battery string (301) and connected to the second medium-high voltage AC power bus (4) through the first transformer (101). The second medium-high voltage AC power bus (4) is connected to the first medium-high voltage AC power bus (3) through the connection control switch (9) between the medium-high voltage AC power buses. The first medium-high voltage AC power bus (3) is connected to the low-voltage AC power bus (7) through the second transformer (102). The low-voltage AC power bus (7) is connected to the low-voltage AC power load (502), thus forming the power path for the medium-high voltage energy storage system inverter (201) to supply power to the low-voltage AC power load (502). The inverter (201) of the medium-high voltage energy storage system is connected to the medium-high voltage AC energy storage battery string (301) and connected to the second medium-high voltage AC power bus (4) through the first transformer (101). The second medium-high voltage AC power bus (4) is connected to the first medium-high voltage AC power bus (3) through the connection control switch (9) between the medium-high voltage AC power buses. The first medium-high voltage AC power bus (3) is connected to the low-voltage AC power bus (7) through the second transformer (102). The low-voltage AC power bus (7) is connected to the low-voltage AC power bus. The inverter (205) connected to the low-voltage DC bus and the low-voltage AC bus is connected to the low-voltage DC power bus (13) and connected to the important load (601) with DC dual power supply, the low-voltage DC load (701) and the microgrid protection and control equipment (702) through the low-voltage DC power bus (13), thus forming the power path for the inverter (201) of the medium- and high-voltage energy storage system to supply power to the important load (601) with DC dual power supply, the low-voltage DC load (701) and the microgrid protection and control equipment (702); The inverter (203) that connects to the low-voltage AC busbar of the new energy power generation system is connected to the low-voltage AC new energy power generation system (802) and connected to the low-voltage AC power busbar (7). The low-voltage AC power busbar (7) connects to the low-voltage AC power load (502), forming a power path for the low-voltage AC new energy power generation system (802) to supply power to the low-voltage AC power load (502). The inverter (203) that connects to the low-voltage AC bus is connected to the low-voltage AC new energy power generation system (802) and connected to the low-voltage AC power bus (7). The inverter (205) that is connected to the low-voltage AC bus via the low-voltage DC bus is connected to the low-voltage DC power bus (13). The low-voltage DC power bus (13) connects to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and control equipment (702). This forms the power path from which the low-voltage AC new energy power generation system (802) supplies power to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and control equipment (702). The energy storage inverter (204) connected to the low-voltage AC bus is connected to the low-voltage AC energy storage battery string (302) and connected to the low-voltage AC power bus (7). The low-voltage AC power bus (7) is connected to the low-voltage AC power load (502), forming a power path for the energy storage inverter (204) connected to the low-voltage AC bus to supply power to the low-voltage AC power load (502). The energy storage inverter (204) connected to the low-voltage AC bus is connected to the low-voltage AC energy storage battery string (302) and connected to the low-voltage AC power bus (7). The inverter (205) connected to the low-voltage AC bus via the low-voltage AC bus (7) is connected to the low-voltage DC power bus (13). The low-voltage DC power bus (13) is connected to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and measurement and control equipment (702). This forms the power path for the energy storage inverter (204) connected to the low-voltage AC bus to supply power to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and measurement and control equipment (702). The low-voltage AC rotor power generation system (902) is connected to the low-voltage AC power bus (7) through the connection control switch (11) of the rotor power generation system to the low-voltage AC power bus. The low-voltage AC power bus (7) is connected to the low-voltage AC power load (502), forming a power path for the low-voltage AC rotor power generation system (902) to supply power to the low-voltage AC power load (502). The low-voltage AC rotor power generation system (902) is connected to the low-voltage AC power bus (7) through the connection control switch (11) of the rotor power generation system. The low-voltage AC power bus (7) is connected to the low-voltage DC power bus (13) through the inverter (205) connected to the low-voltage DC power bus. The low-voltage DC power bus (13) is connected to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and measurement and control equipment (702). This forms the power path for the low-voltage AC rotor power generation system (902) to supply power to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and measurement and control equipment (702). The medium-voltage DC new energy power generation system (803) is connected to the medium-voltage DC power bus (12) via the medium-voltage DC new energy power generation DC / DC (405). The medium-voltage DC power bus (12) connects to the medium-voltage DC power load (602). At the same time, the medium-voltage DC charging pile (603) is connected to the charging pile via the electrical control switch (14) connected to the charging pile via the medium-voltage DC bus. The corresponding important loads (601) are connected via the medium-voltage DC / DC (402) that supply the load through the DC dual-path power supply. The DC / DC (402) that connects the medium-voltage and low-voltage DC buses is also connected to the charging pile. DC (404) is connected to the low-voltage DC power bus (13) and the low-voltage DC power bus (13) is connected to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and control equipment (702), forming the power path of the medium-voltage DC new energy power generation system (803) to supply power to the important load (601) with DC dual power supply, the medium-voltage DC load (602), the medium-voltage DC charging pile (603), the low-voltage DC load (701), and the microgrid protection and control equipment (702); The medium-voltage DC energy storage DC / DC converter (403) is connected to the medium-voltage DC energy storage battery string (303) and connected to the medium-voltage DC power bus (12). The medium-voltage DC power bus (12) is connected to the medium-voltage DC power load (602). At the same time, the medium-voltage DC charging pile (603) is connected to the charging pile through the electrical control switch (14) connected to the charging pile via the medium-voltage DC bus. The medium-voltage DC / DC converter (402) connected to the load via the DC dual-circuit power supply is connected to the corresponding important load (601) via the DC dual-circuit power supply and the DC / DC converter connected to the medium-voltage and low-voltage DC buses. (404) Connect the low-voltage DC power bus (13) and connect the important DC dual-circuit power supply load (601), low-voltage DC load (701), and microgrid protection and control equipment (702) to the low-voltage DC power bus (13), forming a power path for the medium-voltage DC new energy power generation system (803) to supply power to the important DC dual-circuit power supply load (601), medium-voltage DC power load (602), medium-voltage DC charging pile (603), low-voltage DC load (701), and microgrid protection and control equipment (702); The low-voltage energy storage DC / DC (401) of the DC dual-powered load is connected to the low-voltage DC dual-powered energy storage battery string (304) and simultaneously connected to the important DC dual-powered load (601) and the low-voltage DC power bus (13). The low-voltage DC load (701) and the microgrid protection and control equipment (702) are connected by the low-voltage DC power bus (13), thus forming the power path for the low-voltage energy storage DC / DC (401) of the DC dual-powered load to supply power to the important DC dual-powered load (601), the low-voltage DC load (701), and the microgrid protection and control equipment (702). The low-voltage DC new energy power generation system (804) is connected to the low-voltage DC power bus (13) through the low-voltage DC new energy power generation DC / DC (406). The low-voltage DC power bus (13) connects the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and control equipment (702), thus forming the power path for the low-voltage DC new energy power generation system (804) to supply power to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and control equipment (702). The low-voltage DC energy storage battery string (305) is connected to the low-voltage DC power bus (13) through the low-voltage DC energy storage DC / DC (407). The low-voltage DC power bus (13) connects to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and control equipment (702), thus forming a power path for the low-voltage DC energy storage DC / DC (407) to supply power to the important load (601) with DC dual power supply, the low-voltage DC load (701), and the microgrid protection and control equipment (702).

4. According to claim 1, the AC and DC multi-power paths of the AC and DC multi-power paths are further characterized in that: the first medium-high voltage AC power bus (3) is connected to the second medium-high voltage AC power bus (4) through the connecting control switch (9) between the medium-high voltage AC power buses, and is connected to the medium-voltage DC power bus (12) through the third transformer (103) and the inverter (202) that connects the medium-high voltage AC power bus to the medium-voltage DC power bus, thus forming the power path between the first medium-high voltage AC power bus (3) and the second medium-high voltage AC power bus (4) and the medium-voltage DC power bus (12); Meanwhile, the first medium-high voltage AC power bus (3) is connected to the second medium-high voltage AC power bus (4) via the connecting control switch (9) between the medium-high voltage AC power buses, and is connected to the low-voltage AC power bus (7) via the second transformer (102), thus forming the power path between the first medium-high voltage AC power bus (3) and the second medium-high voltage AC power bus (4) and the low-voltage AC power bus (7); The low-voltage AC power bus (7) is connected to the low-voltage DC power bus (13) through the inverter (205) that is connected to the low-voltage DC power bus, forming a power path between the low-voltage AC power bus (7) and the low-voltage DC power bus (13). The medium-voltage DC power bus (12) is connected to the low-voltage DC power bus (13) through the DC / DC (404) connecting the medium-voltage and low-voltage DC buses, thus forming a power path between the medium-voltage DC power bus (12) and the low-voltage DC power bus (13).

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