Micro-energy grid device based on multi-energy complementation and internal autonomous balance

Abstract

The utility model provides a micro-energy network device based on multi-energy complementation and internal autonomous balance. The micro-energy network device comprises a scheduling unit, an energy supply unit, a water desalination unit, a user unit and a biomass unit, the user unit comprises a fresh water user, a power user, a heat energy user and a natural gas user; the sensor network collects user unit demands, sends the user unit demands to the control unit and controls the energy supply unit through a scheduling interface; the energy supply unit generates electric energy including a distributed power supply, gas turbine power generation and a fuel cell; the biomass unit generates natural gas through electric energy and conveys the natural gas to a gas turbine for power generation and natural gas users. The water desalination unit generates fresh water by using electric energy and waste heat and electrolyzes to generate hydrogen, and the fresh water and the hydrogen are respectively conveyed to a fresh water user and a fuel cell. According to the micro energy network device based on multi-energy complementation and internal autonomous balance, different types of energy equipment are highly integrated, compatibility and efficient flow among energy are ensured, and the overall energy efficiency and reliability of a system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of micro energy networks, and particularly to a micro energy network device based on multi - energy complementarity and internal autonomous balance. Background Art

[0002] At present, the centralized energy development mode has gradually exposed problems such as high transmission loss, low utilization efficiency, and serious environmental pollution, and it is difficult to meet the requirements of efficient and clean energy utilization. As a new energy supply method, distributed energy is gradually becoming an important direction for optimizing China's energy structure due to its advantages of being close to users, low loss, and strong flexibility. As a specific implementation of the distributed energy system, the micro energy network can integrate and optimize the utilization of various energy sources such as wind power, photovoltaic, and biomass energy, meet the multiple energy consumption needs of users such as electricity, heat, cold, and gas, and is an important carrier for realizing multi - energy complementarity and efficient utilization. However, the distributed power sources in the micro energy network have volatility and intermittency, and the energy supply - demand balance is easily affected by climate and load fluctuations, thus posing challenges to the safety and stability of the system. How to effectively dispatch and optimize the micro energy network on the basis of ensuring internal demand has become a key problem to be solved urgently. Summary of the Utility Model

[0003] Aiming at the problems existing in the prior art, the utility model provides a micro energy network device based on multi - energy complementarity and internal autonomous balance, which highly integrates different types of energy equipment, ensures the compatibility and efficient flow of different types of energy, and improves the overall energy efficiency and reliability of the system.

[0004] To achieve the above object, the technical scheme adopted by the utility model is as follows: A micro energy network device based on multi - energy complementarity and internal autonomous balance includes a scheduling unit, an energy supply unit, a desalinated water unit, a user unit, and a biomass unit;

[0005] The user unit includes fresh - water users, electricity users, heat - energy users, and natural - gas users;

[0006] The scheduling unit includes a control circuit, a sensor network, and a scheduling interface; the input ends of the sensor network are respectively connected to the fresh - water user, the electricity user, the heat - energy user, and the natural - gas user, the output end of the sensor network is connected to the input end of the control circuit, and the output end of the control circuit is connected to the input end of the scheduling interface;

[0007] The energy supply unit includes distributed power sources, gas turbine power generation, and fuel cells; the output end of the scheduling interface is connected to the energy supply unit, and the energy supply unit operates according to the control signal of the control circuit through the scheduling interface. The energy supply unit generates electric energy and transmits it to the power user, the desalination unit, and the biomass unit respectively. The by-product energy of the energy supply unit includes the first waste heat;

[0008] The biomass unit uses the electric energy to generate at least natural gas, and the natural gas is respectively transported to the feed end of the gas turbine power generation and the natural gas user through the scheduling interface according to the control signal of the control circuit; the by-product energy of the biomass unit includes the second waste heat;

[0009] The waste heat includes the first waste heat and the second waste heat, and the waste heat is respectively used for the heat energy user and the desalination unit; the desalination unit uses the electric energy and waste heat to generate fresh water, and the desalination unit electrolyzes the fresh water with the electric energy to generate hydrogen. The fresh water is transported to the fresh water user through the scheduling interface according to the control signal of the control circuit, and the hydrogen is transported to the feed end of the fuel cell through the scheduling interface according to the control signal of the control circuit.

[0010] Further, the scheduling interface includes a primary scheduling interface and a secondary scheduling interface, and the control circuit preferentially schedules the primary scheduling interface; the output end of the primary scheduling interface is connected to the distributed power source, and the secondary scheduling interface is connected to the gas turbine power generation and the fuel cell.

[0011] Further, the distributed power sources include wind power generation and photovoltaic power generation.

[0012] Further, the biomass unit includes biomass supply, wet biomass module, and dry biomass module;

[0013] The wet biomass module includes a biogas digester, a purification device, and a first gas storage tank arranged in sequence along the transmission direction; the biomass supply supplies wet biomass to the biogas digester, the purification device purifies the biogas generated by the biogas digester into natural gas and stores it in the first gas storage tank; the output end of the first gas storage tank is respectively connected to the natural gas user and the intake end of the gas turbine power generation, and the first gas storage tank transports natural gas to the natural gas user or the gas turbine power generation through the scheduling interface according to the control signal of the control circuit;

[0014] The dry biomass module includes a pyrolysis gasification device and a second gas storage tank; the pyrolysis gasification device uses the electric energy to react the dry biomass provided by the biomass supply to generate syngas, and the syngas is stored in the second gas storage tank; the output end of the second gas storage tank is connected to the intake end of the gas turbine power generation, and the second gas storage tank transmits the syngas to the gas turbine power generation according to the control signal of the control circuit through the dispatching interface.

[0015] Further, the energy supply unit further includes a waste heat boiler, which is used to recover the first waste heat and the second waste heat and respectively output the third waste heat and the fourth waste heat. The third waste heat supplies heat energy to the heat energy user, and the fourth waste heat supplies heat energy to the desalination unit.

[0016] Further, the energy supply unit further includes a heat pipe network. The third waste heat supplies heat energy to the heat pipe network or the heat energy user according to the control signal of the control circuit through the dispatching interface.

[0017] Further, the desalination unit includes seawater supply, desalination device, hydrogen storage tank, water electrolysis hydrogen production device and reservoir;

[0018] The seawater supply provides seawater to the desalination device. The desalination device uses the electric energy and the fourth waste heat to desalinate the seawater to generate fresh water. The fresh water is transmitted to the reservoir or the fresh water user according to the control signal of the control circuit through the dispatching interface. The output end of the reservoir is connected to the fresh water user, and the reservoir supplies fresh water to the fresh water user according to the control signal of the control circuit through the dispatching interface;

[0019] The water electrolysis hydrogen production device uses the electric energy to electrolyze the fresh water to generate hydrogen gas. The hydrogen gas is stored in the hydrogen storage tank. The output end of the hydrogen storage tank is connected to the feed end of the fuel cell, and the hydrogen storage tank transmits hydrogen gas to the fuel cell according to the control signal of the control circuit through the dispatching interface.

[0020] Further, the desalination device includes a thermal desalination device and a membrane desalination device; the membrane desalination device desalinates the seawater to generate fresh water; the thermal desalination device uses the electric energy and the fourth waste heat to desalinate the seawater to generate fresh water.

[0021] Further, the biomass unit further includes a natural gas pipe network, and the natural gas pipe network supplies natural gas to the natural gas user according to the control signal of the control circuit through the dispatching interface.

[0022] Furthermore, the electric energy is transmitted through a power pipeline, and a storage battery is arranged on the power pipeline. The electric energy is transmitted to the storage battery or the power user through the scheduling interface according to the control signal of the control circuit.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] By integrating multiple types of energy devices through efficient integration and coordinated operation, the utility model realizes the efficient utilization of various energy forms and the autonomous balance within the system, and meets the energy, fresh water and natural gas demands of the user unit, ensuring the economy and flexibility of the system under the premise of independent operation. It not only improves the energy utilization efficiency, but also enhances the stability and independence of the system in the island mode, and has wide applicability and practical value. Description of the Drawings

[0025] Figure 1 is a structural schematic diagram of the utility model;

[0026] Figure 2 is a structural schematic diagram of the scheduling unit in the utility model.

[0027] Among them, the reference numerals are: 100, energy supply unit; 101, wind power generation; 102, photovoltaic power generation; 103, gas turbine power generation; 104, fuel cell; 110, power pipeline; 111, first converter; 112, second converter; 113, third converter; 114, storage battery; 115, fourth converter; 120, heat pipeline; 121, waste heat boiler; 122, main heat pipeline network; 200, desalinated water unit; 201, seawater supply; 202, thermal desalination device; 203, membrane desalination device; 204, water electrolysis hydrogen production device; 205, hydrogen storage tank; 206, reservoir; 210, water pipeline; 220, hydrogen pipeline; 300, user unit; 301, fresh water user; 302, power user; 303, heat energy user; 304, natural gas user; 400, biomass unit; 401, biomass supply; 402, biogas digester; 403, purification device; 404, first gas storage tank; 405, pyrolysis gasification device; 406, second gas storage tank; 407, main natural gas pipeline network; 410, biomass pipeline; 420, natural gas pipeline; 500, scheduling unit; 510, sensor network; 520, control circuit; 530, scheduling interface; 531, primary scheduling interface; 532, secondary scheduling interface. Detailed Embodiments

[0028] It should be noted that the methods used in the utility model are all conventional methods without special regulations; the raw materials and devices used are all conventional commercially available products without special regulations, and their sources are not specifically limited.

[0029] To address the issue of the volatility of distributed power sources, micro energy grids usually enhance the system's regulation ability by introducing energy storage devices, flexible loads, and demand response measures to achieve system autonomous balance. Under the mode of autonomous operation within the system, the micro energy grid can achieve on-site consumption and self-balance among different energy devices to meet the internal load demand of the system. By reasonably dispatching devices such as biomass energy, electrolytic hydrogen production, and energy storage, the micro energy grid can achieve diversified conversion and storage of energy and avoid system instability caused by the fluctuation of a single energy supply. However, existing autonomous dispatching strategies for micro energy grids mainly focus on single-objective optimization and lack comprehensive consideration of multiple dimensions such as cost, environmental benefits, and risks. Therefore, constructing a multi-objective autonomous dispatching model that can optimize economic benefits, environmental benefits, and risks simultaneously has become the key to improving the operation efficiency of micro energy grids. In addition, when the micro energy grid meets its own load demand, there may be remaining regulation capabilities in its internal distributed power sources, energy storage, and demand response, thus having the potential to provide flexible resources for the superior power grid.

[0030] In the coordinated operation of the micro energy grid and the superior power grid, benefit distribution is also a key issue that cannot be ignored. There are various entities such as distributed power sources, conventional power sources, energy storage, and flexible loads within the micro energy grid group. When coordinating with the superior power grid, it also involves external cooperation entities such as distributed power source merchants, thermal power units, energy storage devices, and the power grid. Under the hierarchical coordinated dispatching mode, the dispatching optimization and hierarchical cooperation relationship between the micro energy grid and the superior power grid will give rise to the benefits and costs among different entities. Therefore, it is necessary to establish a reasonable benefit distribution mechanism to ensure the interest balance of multiple entities and the sustainable operation of the system.

[0031] A micro energy grid device based on multi-energy complementarity and internal autonomous balance includes a dispatching unit 500, an energy supply unit 100, a desalinated water unit 200, a user unit 300, and a biomass unit 400;

[0032] See Figure 1 , the user unit 300 includes a fresh water user 301, an electricity user 302, a heat energy user 303, and a natural gas user 304;

[0033] See Figure 2, the scheduling unit includes a control circuit 520, a sensor network 510, and a scheduling interface 530; the input ends of the sensor network 510 are respectively connected to a fresh water user 301, an electric power user 302, a heat energy user 303, and a natural gas user 304. The input ends of the sensor network 510, that is, the sensor nodes, monitor the user unit 300 in real time and feed back the data to the control circuit 520. The output end of the sensor network 510 is connected to the input end of the control circuit 520, and the output end of the control circuit 520 is connected to the input end of the scheduling interface 530. According to the requirements of the user unit 300, the supply of energy (including electric power and heat energy), fresh water supply, and natural gas supply are realized through the control of the control circuit 520; preferably, the scheduling interface 530 is an interface module of a router and has a plug-and-play function. The interface module of the router is a prior art and will not be elaborated here.

[0034] Still referring to Figure 1 , the energy supply unit 100 includes a distributed power source, a gas turbine power generation 103, and a fuel cell 104; the output end of the scheduling interface 530 is connected to the energy supply unit 100. The energy supply unit 100 operates according to the control signal of the control circuit 520 through the scheduling interface 530. The energy supply unit 100 generates electric energy and transmits it to the electric power user 302, the desalination water unit 200, and the biomass unit 400 respectively. The by-product energy of the energy supply unit 100 includes the first waste heat;

[0035] The biomass unit 400 uses electric energy to generate at least natural gas. The natural gas is respectively transported to the feed end of the gas turbine power generation 103 and the natural gas user 304 according to the control signal of the control circuit 520 through the scheduling interface 530. The natural gas can be used as the raw material of the gas turbine power generation 103 and can also supply the natural gas user 304; the by-product energy of the biomass unit 400 includes the second waste heat;

[0036] The waste heat includes the first waste heat and the second waste heat. The waste heat is transmitted through the heat energy pipeline 120 and is respectively used for the heat energy user 303 and the desalination water unit 200; the desalination water unit 200 uses electric energy and waste heat to generate fresh water, and the desalination water unit 200 uses electric energy to electrolyze fresh water to generate hydrogen. The fresh water is transported to the fresh water user 301 according to the control signal of the control circuit 520 through the scheduling interface 530, and the hydrogen is transported to the feed end of the fuel cell 104 according to the control signal of the control circuit 520 through the scheduling interface 530. The hydrogen can be used as the raw material of the fuel cell 104.

[0037] The utility model realizes the efficient utilization of various energy forms and the autonomous balance within the system by means of multi-energy complementarity of the energy supply unit 100, the desalinated water unit 200 and the biomass unit 400. By integrating multi-type energy devices such as distributed power sources, gas turbine power generation 103 and fuel cells 104 and user demand devices such as the fresh water desalination unit 200 and the biomass unit 400, it meets the energy (including electricity and heat), fresh water and natural gas demands of the user unit 300, ensures the independent operation of the system, not only improves the energy utilization efficiency, but also enhances the stability and independence of the system in the island mode, and has wide applicability and practical value.

[0038] Furthermore, the scheduling interface 530 includes a primary scheduling interface 531 and a secondary scheduling interface 532. The control circuit 520 preferentially schedules the primary scheduling interface 531; the output end of the primary scheduling interface 531 is connected to the distributed power source. Preferably, the distributed power source includes wind power generation 101 and photovoltaic power generation 102. The secondary scheduling interface 532 is connected to the gas turbine power generation 103 and the fuel cell 104. By preferentially utilizing the volatile renewable energy, it reduces the dependence on traditional energy, realizes the green and low-carbon energy utilization, and at the same time realizes the combination of equipment priority control and dynamic scheduling, ensuring the preferential use of renewable energy, and achieving the effects of reducing the operation cost and improving the equipment utilization rate.

[0039] Electric energy is transmitted through the power pipeline 110. A storage battery 114 is arranged on the power pipeline 110. Electric energy is transmitted to the storage battery 114 or the power user 302 through the scheduling interface 530 according to the control signal of the control circuit 520. When there is a surplus in the electric load demand of the power user 302, the electric energy is stored in the storage battery 114. Furthermore, the storage battery 114 supplies electric energy to the power user 302 through the scheduling interface 530 according to the control signal of the control circuit 520. When the generated and surplus electric energy of the energy supply unit 100 at that time cannot meet the electric load demand of the power user 302, the storage battery 114 supplies electric energy to the power user 302, further improving the energy utilization efficiency.

[0040] The electric energy generated by the photovoltaic power generation 102 is transmitted through the power pipeline 110 after commutation by the first commutator 111;

[0041] The electric energy generated by the fuel cell 104 is transmitted through the power pipeline 110 after commutation by the second commutator 112;

[0042] When the storage battery 114 discharges, it is transmitted through the power pipeline 110 after commutation by the fourth commutator 115;

[0043] Furthermore, the biomass unit 400 includes a biomass supply 401, a wet biomass module and a dry biomass module, improving the flexibility of the biomass unit 400;

[0044] The wet biomass module includes a biogas digester 402, a purification device 403, and a first gas storage tank 404 arranged in sequence along the transmission direction; the biomass supply 401 supplies wet biomass to the biogas digester 402, and the purification device 403 purifies the biogas generated by the biogas digester 402 into natural gas and stores it in the first gas storage tank 404; the output end of the first gas storage tank 404 is respectively connected to the natural gas user 304 and the intake end of the gas turbine power generation 103, and the first gas storage tank 404 transmits natural gas to the natural gas user 304 or the gas turbine power generation 103 through the scheduling interface 530 according to the control signal of the control circuit 520;

[0045] The dry biomass module includes a pyrolysis gasification device 405 and a second gas storage tank 406; the pyrolysis gasification device 405 uses electric energy to react the dry biomass provided by the biomass supply 401 to generate syngas, and the syngas is stored in the second gas storage tank 406; the output end of the second gas storage tank 406 is connected to the intake end of the gas turbine power generation 103, and the second gas storage tank 406 transmits syngas to the gas turbine power generation 103 through the scheduling interface 530 according to the control signal of the control circuit 520, and the syngas can also be used as the raw material of the gas turbine power generation 103;

[0046] The biomass reaction process and the syngas are transmitted through the biomass pipeline 410, and after purification, the natural gas is transmitted along the natural gas pipeline 420;

[0047] When the natural gas user 304 has a demand for natural gas, control the first gas storage tank 404 to supply natural gas to the natural gas user 304; when the gas turbine power generation 103 needs to operate, control the first gas storage tank 404 to transmit natural gas to the gas turbine power generation 103 and / or control the second gas storage tank 406 to transmit syngas to the gas turbine power generation 103;

[0048] Preferably, the biomass unit 400 further includes a natural gas pipeline network 407, and the natural gas pipeline network 407 supplies natural gas to the natural gas user 304 through the scheduling interface 530 according to the control signal of the control circuit 520. When the remaining gas load of the first gas storage tank 404 cannot meet the demand of the natural gas user 304, control the natural gas pipeline network 407 to supply natural gas to the natural gas user 304 to meet the natural gas consumption demand of the system.

[0049] The energy supply unit 100 further includes a waste heat boiler 121, and the waste heat boiler 121 is used to recover the first waste heat and the second waste heat and respectively output the third waste heat and the fourth waste heat. The third waste heat supplies heat energy to the heat energy user 303, and the fourth waste heat supplies heat energy to the desalination water unit 200.

[0050] Preferably, the energy supply unit 100 further includes a heat pipe network 122. The third waste heat supplies heat energy to the heat pipe network 122 or heat energy users 303 through the scheduling interface 530 according to the control signal of the control circuit 520. When there is a surplus in the heat load demand of the heat energy users 303, the third waste heat is stored in the heat pipe network 122. Further, the heat pipe network 122 supplies heat energy to the heat energy users 303 through the scheduling interface 530 according to the control signal of the control circuit 520. When the third waste heat cannot meet the heat load demand of the heat energy users 303, the heat pipe network 122 supplies heat energy to the heat energy users 303, further improving the utilization efficiency of energy.

[0051] The desalinated water unit 200 includes a seawater supply 201, a desalination device, a hydrogen storage tank 205, a water electrolysis hydrogen production device 204, and a reservoir 206; the water flow in the desalinated water unit 200 is transmitted through a water pipeline 210;

[0052] The seawater supply 201 provides seawater to the desalination device. The desalination device uses electric energy and the fourth waste heat to desalinate seawater to generate fresh water. The fresh water is transmitted to the reservoir 206 or fresh water users 301 through the scheduling interface 530 according to the control signal of the control circuit 520. The output end of the reservoir 206 is connected to the fresh water users 301. The reservoir 206 supplies fresh water to the fresh water users 301 through the scheduling interface 530 according to the control signal of the control circuit 520; usually, the fresh water generated by desalinating seawater by the desalination device is stored in the reservoir 206. When the fresh water users 301 have a demand for fresh water, the fresh water generated by desalinating seawater is directly supplied to the fresh water users 301 or the fresh water stored in the reservoir 206 is supplied to the fresh water users 301, with reasonable storage and use, improving the overall operation efficiency of the system;

[0053] The desalination device includes a thermal desalination device 202 and a membrane desalination device 203; the membrane desalination device 203 desalinates seawater to generate fresh water; the thermal desalination device 202 uses electric energy and the fourth waste heat to desalinate seawater to generate fresh water.

[0054] The water electrolysis hydrogen production device 204 uses electric energy to electrolyze fresh water to generate hydrogen. The electric energy in the power pipeline 110 is converted by the third converter 113 for use by the water electrolysis hydrogen production device 204. The hydrogen is stored in the hydrogen storage tank 205. The output end of the hydrogen storage tank 205 is connected to the feed end of the fuel cell 104. And the hydrogen storage tank 205 transmits hydrogen to the fuel cell 104 through the scheduling interface 530 according to the control signal of the control circuit 520. The hydrogen is transmitted through the hydrogen pipeline 220.

[0055] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than limiting the protection scope of the present invention. Any simple modification or equivalent replacement made by those of ordinary skill in the art to the technical solution of the present invention does not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A micro energy grid device based on multi - energy complementarity and internal autonomous balance, characterized in that: It includes a scheduling unit, an energy supply unit, a desalinated water unit, a user unit, and a biomass unit; The user unit includes a fresh water user, an electricity user, a heat energy user, and a natural gas user; The scheduling unit includes a control circuit, a sensor network, and a scheduling interface; the input ends of the sensor network are respectively connected to the fresh water user, the electricity user, the heat energy user, and the natural gas user, the output end of the sensor network is connected to the input end of the control circuit, and the output end of the control circuit is connected to the input end of the scheduling interface; The energy supply unit includes a distributed power source, a gas turbine power generation, and a fuel cell; the output end of the scheduling interface is connected to the energy supply unit, the energy supply unit operates according to the control signal of the control circuit through the scheduling interface, the energy supply unit generates electric energy and transmits it to the electricity user, the desalinated water unit, and the biomass unit respectively, and the by-product energy of the energy supply unit includes the first waste heat; The biomass unit uses the electric energy to generate at least natural gas, and the natural gas is respectively transported to the feed end of the gas turbine power generation and the natural gas user through the scheduling interface according to the control signal of the control circuit; the by-product energy of the biomass unit includes the second waste heat; The waste heat includes the first waste heat and the second waste heat, and the waste heat is respectively used for the heat energy user and the desalinated water unit; the desalinated water unit uses the electric energy and waste heat to generate fresh water, and the desalinated water unit uses the electric energy to electrolyze the fresh water to generate hydrogen. The fresh water is transported to the fresh water user through the scheduling interface according to the control signal of the control circuit, and the hydrogen is transported to the feed end of the fuel cell through the scheduling interface according to the control signal of the control circuit.

2. The micro energy network device based on multi - energy complementarity and internal autonomous balance according to claim 1, wherein: The scheduling interface includes a primary scheduling interface and a secondary scheduling interface, and the control circuit preferentially schedules the primary scheduling interface; the output end of the primary scheduling interface is connected to the distributed power source, and the secondary scheduling interface is connected to the gas turbine power generation and the fuel cell.

3. The micro energy network device based on multi - energy complementarity and internal autonomous balance according to claim 2, characterized in that: The distributed power source includes wind power generation and photovoltaic power generation.

4. The micro energy network device based on multi - energy complementarity and internal autonomous balance according to claim 1, characterized in that: The biomass unit includes a biomass supply, a wet biomass module, and a dry biomass module; The wet biomass module includes a biogas digester, a purification device, and a first gas storage tank arranged in sequence along the transmission direction; the biomass supply supplies wet biomass to the biogas digester, and the purification device purifies the biogas generated by the biogas digester into natural gas and stores it in the first gas storage tank; The output end of the first gas storage tank is respectively connected to the natural gas user and the intake end of the gas turbine power generation, and the first gas storage tank transmits natural gas to the natural gas user or the gas turbine power generation through the scheduling interface according to the control signal of the control circuit; The dry biomass module includes a pyrolysis gasification device and a second gas storage tank; the pyrolysis gasification device uses the electric energy to react the dry biomass provided by the biomass supply to generate syngas, and the syngas is stored in the second gas storage tank; the output end of the second gas storage tank is connected to the intake end of the gas turbine power generation, and the second gas storage tank transmits the syngas to the gas turbine power generation according to the control signal of the control circuit through the dispatching interface.

5. The micro energy grid device based on multi - energy complementarity and internal autonomous balance according to claim 4, wherein: The energy supply unit further includes a waste heat boiler, which is used to recover the first waste heat and the second waste heat and respectively output the third waste heat and the fourth waste heat. The third waste heat supplies heat energy to the heat energy user, and the fourth waste heat supplies heat energy to the desalination water unit.

6. The micro energy grid device based on multi - energy complementarity and internal autonomous balance according to claim 5, characterized in that: The energy supply unit further includes a heat pipe network. The third waste heat supplies heat energy to the heat pipe network or the heat energy user according to the control signal of the control circuit through the dispatching interface.

7. The micro energy network device based on multi - energy complementarity and internal autonomous balance according to claim 5, characterized in that: The desalination water unit includes a seawater supply, a desalination device, a hydrogen storage tank, a water electrolysis hydrogen production device and a reservoir; The seawater supply provides seawater to the desalination device. The desalination device uses the electric energy and the fourth waste heat to desalinate the seawater to generate fresh water. The fresh water is transmitted to the reservoir or the fresh water user according to the control signal of the control circuit through the dispatching interface. The output end of the reservoir is connected to the fresh water user, and the reservoir supplies fresh water to the fresh water user according to the control signal of the control circuit through the dispatching interface. The water electrolysis hydrogen production device uses the electric energy to electrolyze the fresh water to generate hydrogen gas. The hydrogen gas is stored in the hydrogen storage tank. The output end of the hydrogen storage tank is connected to the feed end of the fuel cell, and the hydrogen storage tank transmits hydrogen gas to the fuel cell according to the control signal of the control circuit through the dispatching interface.

8. The micro energy network device based on multi - energy complementarity and internal autonomous balance according to claim 7, characterized in that: The desalination device includes a thermal desalination device and a membrane desalination device; the membrane desalination device desalinates the seawater to generate fresh water; the thermal desalination device uses the electric energy and the fourth waste heat to desalinate the seawater to generate fresh water.

9. The micro energy network device based on multi - energy complementarity and internal autonomous balance according to claim 4, characterized in that: The biomass unit further includes a natural gas pipeline network, which supplies natural gas to the natural gas user according to the control signal of the control circuit through the dispatching interface.

10. The micro energy grid device based on multi - energy complementarity and internal autonomy balance according to any one of claims 1 - 9, characterized in that: The electric energy is transmitted through an electric pipeline. A storage battery is arranged on the electric pipeline. The electric energy is transmitted to the storage battery or the electric energy user according to the control signal of the control circuit through the dispatching interface.

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