Multi-energy complementary power supply system

Abstract

The invention discloses a multi-energy complementary power supply system, which belongs to the technical field of electrical systems and comprises an energy input subsystem, an energy conversion subsystem, an energy storage subsystem, an energy management and control subsystem, an energy distribution and transmission subsystem, a user side subsystem, a protection and safety subsystem and an auxiliary service subsystem. The energy input subsystem comprises a solar power generation module. According to the multi-energy complementary power supply system, multi-energy complementation can be achieved, continuous power supply can be guaranteed, it is ensured that energy input exists in any time period, after the internal combustion engine generates electricity, the waste heat boiler recovers waste heat (the temperature is larger than or equal to 150 DEG C) to generate steam, the absorption refrigerator is driven to refrigerate, electricity-heat-cold triple generation is achieved, the primary energy utilization rate (PER) is larger than or equal to 85% (the PER of a traditional separate production system is smaller than or equal to 50%), and the energy consumption is reduced. The energy utilization rate (PER is greater than or equal to 85%) is improved, and energy supply in any time period is guaranteed through cooperation with renewable energy sources and an energy storage system.

Description

Technical Field

[0001] This invention relates to the field of power supply system technology, specifically a multi-energy complementary power supply system. Background Technology

[0002] A power supply system refers to a comprehensive solution that uses a series of equipment, facilities, and technologies to safely, reliably, and efficiently transmit electrical energy from the production end (power plant) to the user end (such as homes, factories, commercial buildings, etc.) and meet the diverse electricity needs of users. It is a core component of the modern energy system and is directly related to social production, living order, and economic development. A complementary power supply system is a power supply model that integrates multiple energy forms to achieve complementary advantages and stable supply. It breaks through the limitations of a single energy source and improves energy utilization efficiency, reliability, and economy through the coordinated work of multiple energy sources. It is especially suitable for scenarios with high requirements for power supply stability or a large proportion of renewable energy. At present, the use of clean energy such as solar and wind energy is increasing, especially in power supply, where it has become widespread. Moreover, power generation devices using solar and wind energy are becoming increasingly mature, and their cost-effectiveness has been significantly improved. However, in the process of using solar and wind energy for power supply, when there is insufficient sunlight and insufficient wind, the power supply will become unstable, affecting the normal operation of the load.

[0003] Prior art 1 (Chinese patent application number 201420026553.X, application date 2014-01-16) discloses a multi-energy complementary power supply system, comprising a solar power generation device, a wind power generation device, a fuel oil power generation device, a control cabinet, an inverter, and a battery pack; the solar power generation device and the wind power generation device are electrically connected to the battery pack; the fuel oil power generation device is electrically connected to the control cabinet and the battery pack; the input circuit of the inverter is connected to the battery pack, and the output circuit is connected to the control cabinet; when there is sufficient sunlight or wind, the solar power generation device and the wind power generation device both supply power to the load and charge the battery pack; when there is insufficient sunlight or wind, the battery pack discharges to maintain the normal operation of the load; and the power supply system also includes a fuel oil generator to generate electricity when the battery pack's power is insufficient, further maintaining the normal operation of the load.

[0004] Prior art 2 (Chinese patent application number 201520584501.9, application date 2015-08-05) discloses a motorhome and its multi-energy complementary combined power supply system. This combined power supply system includes a fuel cell, a solar panel, and a power battery. The fuel cell's intake end is connected to both an intake device and a hydrogen storage device. The solar panel's output end is also connected to a water electrolysis device for hydrogen production. The fuel cell and solar panel are connected to the power battery via a DC / DC converter. A DC / AC inverter is connected to the line between the DC / DC converter and the power battery. The system also includes an auxiliary hydrogen storage device for supplying hydrogen produced by the water electrolysis device to the vehicle's gas-using equipment. This multi-energy complementary combined power supply system uses solar panels, fuel cells, and a power battery to jointly power the vehicle, while simultaneously using the solar panels to power the water electrolysis device, ensuring the operation of the vehicle's fuel cell and gas-using equipment.

[0005] Solar energy has no output at night, wind energy is highly intermittent, and fossil fuels are subject to resource depletion and geopolitical constraints. Reliance on a single energy source can easily lead to power outages or drastic price fluctuations. Furthermore, batteries need to be replaced regularly (e.g., lead-acid batteries have a lifespan of 3-5 years, and lithium-ion batteries 8-15 years), with replacement costs accounting for 30%-50% of the total lifespan cost. During use, the above devices cannot achieve multi-energy complementarity, continuous power supply, or a combined electricity-heat-cooling (CHP) system, resulting in low energy efficiency, significant waste, high economic costs, enormous operational pressure, and reduced risk resistance. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-energy complementary power supply system to solve the problems mentioned in the background art, which are that the system cannot achieve multi-energy complementarity, continuous power supply and "electricity-heating-cooling" tri-generation system, resulting in low energy efficiency and serious waste, high economic costs, huge operating pressure and reduced risk resistance.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a multi-energy complementary power supply system, comprising an energy input subsystem, an energy conversion subsystem, an energy storage subsystem, an energy management and control subsystem, an energy distribution and transmission subsystem, a user-side subsystem, a protection and safety subsystem, and an auxiliary service subsystem; the energy input subsystem includes solar power generation modules, wind power generation modules, hydropower generation modules, biomass energy modules, and fossil fuel modules; the energy conversion subsystem includes a power electronic converter, a combined heat and power (CCHP) system, and a water electrolysis hydrogen production device; the energy storage subsystem includes an electric... The system includes chemical energy storage, mechanical energy storage, thermal energy storage, and hydrogen energy storage; the energy management and control subsystem includes an energy management system (EMS), microgrid controllers, predictive and optimization algorithms, and communication networks; the energy distribution and transmission subsystem includes a power distribution network, heat pipes, and smart meters; the user-side subsystem includes smart loads, electric vehicle charging stations, and a home energy management system (HEMS); the protection and safety subsystem includes relay protection devices, lightning protection and grounding systems, fire protection systems, and security monitoring cameras; and the auxiliary service subsystem includes maintenance and repair equipment, metering and monitoring instruments, and environmental protection facilities.

[0008] Preferably, when the solar power generation module is working, the back of some photovoltaic panels can receive ground-reflected light, increasing power generation by 5%-20%, and (single-axis tracking system) can increase annual power generation by 15%-25%, and (dual-axis tracking system) can increase it by more than 30%. When the fossil fuel module is in operation, it uses ultra-low sulfur diesel (sulfur content ≤10ppm) and is equipped with an oxidation catalyst (DOC) to reduce particulate matter emissions; The biomass energy module includes a gasifier with a drying zone, a pyrolysis zone, a reduction zone, and an oxidation zone, which improves the quality of the gas (calorific value ≥5MJ / m³). At the same time, CO2 and H2S are removed by water washing or membrane separation, increasing the methane content of the biogas to 50%-70%.

[0009] Preferably, the power electronic converter is specifically a three-level inverter and a bidirectional DC / DC converter; The three-level inverter adopts a neutral point clamp (NPC) topology, and its output voltage waveform is closer to a sine wave with a harmonic content of ≤3%. A bidirectional DC / DC converter, based on LLC resonant topology, enables bidirectional flow of electrical energy; The combined heat and power (CCHP) system specifically comprises an internal combustion engine, a waste heat boiler, and an absorption chiller. Internal combustion engine, four-stroke diesel engine, rated power 3.4MW, fuel consumption rate ≤190g / kWh; Waste heat boiler, fire-tube design, generates 1.5MPa saturated steam with a thermal efficiency of ≥85%; Absorption chiller, double-effect lithium bromide unit, cooling capacity range 500-2000kW, COP (coefficient of performance) ≥1.2; The water electrolysis hydrogen production device specifically includes an alkaline electrolyzer, a proton exchange membrane (PEM) electrolyzer, and a hydrogen purification system. Alkaline electrolytic cell, bipolar design, electrode area 2m², electrolyte is 25% KOH solution from a multi-energy complementary power supply system; Proton exchange membrane (PEM) electrolyzer, thin-layer electrolytic cell, membrane electrode thickness ≤200μm, fast dynamic response (≤1s).

[0010] Preferably, the energy storage subsystem stores energy when there is an energy surplus or a low demand, and releases it when there is a shortage. Electrochemical energy storage: Lithium-ion batteries / flow batteries store electrical energy, and flywheel energy storage smooths out instantaneous fluctuations (response time ≤ 5ms). Mechanical energy storage: Pumped storage pumps water to the upper reservoir during off-peak hours and releases water to generate electricity during peak hours; Hydrogen energy storage: The hydrogen compressor compresses the electrolyzed hydrogen into a 35MPa storage tank, and the fuel cell converts the hydrogen energy into electrical energy during peak demand periods.

[0011] Preferably, the energy distribution and transmission subsystem, after the energy is converted or stored under the triggering condition, needs to be delivered to the user end; Power transmission: The high-voltage GIS boosts the power to 110kV for transmission, and the low-voltage intelligent distribution cabinet improves the power quality before supplying it to users; Heat transfer: Pre-insulated pipes transport waste heat or molten salt heat storage from the combined heat and power (CCHP) system to the heat exchange station, and plate heat exchangers adjust the heating temperature. Smart metering: Smart meters measure users' electricity consumption / generation bidirectionally and upload data in real time via HPLC carrier communication.

[0012] Preferably, the user-side subsystem requires real-time monitoring and optimization of the triggering conditions during system operation; The Energy Management System (EMS) scheduling: Based on a cloud computing platform integrating AI algorithms, combined with WRF weather forecasts and LSTM load forecast data, an economic scheduling plan is formulated; Microgrid control: Redundant PLCs perform grid-connected / islanded switching (time ≤ 100ms) and adjust frequency / voltage to a stable range; Communication and coordination: Data is transmitted between industrial Ethernet and LoRaWAN networks to ensure information synchronization among subsystems (time synchronization accuracy ≤1μs).

[0013] Preferably, the protection and security subsystem requires real-time monitoring and optimization of the triggering conditions during system operation; Relay protection: Fiber optic differential protection quickly isolates line faults (operation time ≤3ms); generator protection prevents overcurrent / loss of excitation. Lightning protection grounding: Zinc oxide surge arresters limit lightning overvoltage (residual voltage ≤1.5kV), and copper-clad steel grounding bodies ensure grounding resistance ≤1Ω; Fire alarm: Heptafluoropropane fire extinguishing device automatically detects fire (response time ≤30s), infrared thermal imager monitors equipment for temperature anomalies (accuracy ±2°C).

[0014] Preferably, the auxiliary service subsystem is triggered by the need for maintenance or environmental protection during system operation; Predictive maintenance: UAV inspection equipped with infrared thermal imager to detect overheating (coverage radius ≥ 5km), SKF vibration analysis to diagnose bearing faults; Environmental protection measures: SCR device removes NOx from gas turbine exhaust gas (efficiency ≥90%), sound barrier reduces noise (effect ≥25dB(A)); Data monitoring: Fluke multi-energy complementary power supply system 1738 power quality analyzer records 1000+ parameters, multi-parameter gas sensor monitors the environment (CO2 / CH4 / H2S).

[0015] Compared with the prior art, the beneficial effects of the present invention are: it adopts a novel structural design, the specific details of which are as follows: (1) This multi-energy complementary power supply system can achieve multi-energy complementarity and ensure continuous power supply, ensuring that there is energy input at any time. After the internal combustion engine generates electricity, the waste heat boiler recovers waste heat (temperature ≥150℃) to generate steam, which drives the absorption refrigeration machine to refrigerate, realizing "electricity-heat-cooling" triple supply. The primary energy utilization rate (PER) is ≥85% (the traditional separate production system PER≤50%). It not only improves the energy utilization rate (PER≥85%), but also ensures energy supply at any time through the synergy with renewable energy and energy storage systems.

[0016] Furthermore, multi-energy complementary power supply systems achieve dual advantages in reducing carbon emissions (annual emission reduction of tens of thousands of tons) and reducing operating costs (full life cycle cost optimization) through technologies such as high proportion of renewable energy, waste heat recovery, dynamic electricity price response, and multi-energy synergy.

[0017] (2) This multi-energy complementary power supply system realizes the closed-loop control of the entire process of "storage-scheduling-optimization" by setting up an energy storage subsystem and an energy management and control subsystem. The storage subsystem provides energy regulation capabilities of multiple technologies and all scenarios to balance the intermittency of renewable energy. At the same time, the management and control subsystem optimizes the use of storage resources and reduces operating costs through intelligent algorithms and real-time communication. The two work together to improve the system's reliability (annual power outage time < 1 hour), efficiency (PER ≥ 85%), and environmental protection (annual CO2 emission reduction of tens of thousands of tons).

[0018] Furthermore, through the established energy distribution and transmission subsystem, multi-energy flow coordination, cascade utilization, and intelligent scheduling can be achieved, improving efficiency and reliability, reducing operating costs and carbon emissions, creating green economic benefits, enhancing the adaptability of the energy system, promoting the large-scale consumption of renewable energy, and contributing to the achievement of the "dual carbon" target.

[0019] (3) This multi-energy complementary power supply system, through the protection and safety subsystem and auxiliary service subsystem, monitors the current in real time through intelligent circuit breakers and cuts off faulty lines within 0.1 seconds to prevent equipment burnout or fire caused by short circuits or overloads, and prevents the "island effect" from endangering the safety of maintenance personnel or damaging equipment. In addition, it collects user electricity consumption data through smart meters and generates energy efficiency reports by combining AI algorithms to help users reduce electricity costs by 10%-15%. It can build multiple protections from equipment to system to ensure the safety of personnel, equipment and data. At the same time, it improves the system adaptability and reduces operating costs through services such as demand response and peak shaving and frequency regulation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the workflow of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention provides the following technical solution: a multi-energy complementary power supply system, comprising: an energy input subsystem, an energy conversion subsystem, an energy storage subsystem, an energy management and control subsystem, an energy distribution and transmission subsystem, a user-side subsystem, a protection and safety subsystem, and an auxiliary service subsystem; the energy input subsystem includes solar power generation modules, wind power generation modules, hydropower generation modules, biomass energy modules, and fossil fuel modules; the energy conversion subsystem includes power electronic converters, combined heat and power (CCHP) systems, and water electrolysis hydrogen production devices; the energy storage subsystem includes electrochemical energy storage, mechanical energy storage, thermal energy storage, and hydrogen energy storage; the energy management and control subsystem includes an energy management system (EMS), microgrid controllers, predictive and optimization algorithms, and a communication network; the energy distribution and transmission subsystem includes a power distribution network, heat pipes, and smart meters; the user-side subsystem includes smart loads, electric vehicle charging piles, and a home energy management system (HEMS); the protection and safety subsystem includes relay protection devices, lightning protection and grounding systems, fire protection systems, and security monitoring cameras; and the auxiliary service subsystem includes maintenance and repair equipment, metering and monitoring instruments, and environmental protection facilities.

[0023] Solar power modules (photovoltaic panels), wind power modules (wind turbines), hydropower modules (water turbines), biomass energy modules (biogas generators), and fossil fuel modules (gas turbines) simultaneously collect raw energy. The Energy Management and Control Subsystem (EMS) dynamically adjusts the input ratio of each energy source based on real-time resource conditions (such as sunlight intensity and wind speed) and cost strategies, prioritizing the use of renewable energy. When renewable energy is insufficient, the fossil fuel module is activated. The power electronic converter converts the DC / irregular AC power generated by solar, wind, and hydropower into AC power that conforms to grid standards. Furthermore, the MS uses meteorological data (such as sunlight / wind speed forecasts) and load demand (feedback from the user-side HEMS) to further optimize the system. Based on the energy storage status, real-time scheduling strategies are formulated through optimization algorithms (such as dynamic programming and machine learning). At the same time, the Home Energy Management System (HEMS) adjusts the load according to the electricity price signal. Electric vehicle charging piles prioritize the use of surplus photovoltaic power to ensure energy input at any time. After the internal combustion engine generates electricity, the waste heat boiler recovers waste heat (temperature ≥150℃) to generate steam, which drives the absorption chiller for refrigeration, realizing a "electricity-heat-cooling" tri-generation system with a primary energy utilization rate (PER) ≥85% (compared to PER≤50% for traditional separate production systems). This not only improves energy utilization rate (PER≥85%), but also ensures energy supply at any time through collaboration with renewable energy and energy storage systems.

[0024] When the solar power generation module is working, the back of some photovoltaic panels can receive reflected light from the ground, increasing power generation by 5%-20%, and (single-axis tracking system) can increase annual power generation by 15%-25%, (dual-axis tracking system) can increase it by more than 30%; when the fossil fuel module is working, it uses ultra-low sulfur diesel (sulfur content ≤10ppm) and is equipped with an oxidation catalyst (DOC) to reduce particulate matter emissions; the biomass energy module includes a gasifier divided into a drying zone, a pyrolysis zone, a reduction zone, and an oxidation zone to improve the quality of the fuel gas (calorific value ≥5MJ / m³), and also uses water washing. CO2 and H2S are removed by membrane separation or other methods, increasing the methane content in biogas to 50%-70%. Power electronic converters are used, specifically three-level inverters and bidirectional DC / DC converters. The three-level inverters employ a neutral-point clamping (NPC) topology, resulting in an output voltage waveform closer to a sine wave with harmonic content ≤3%. The bidirectional DC / DC converters are based on an LLC resonant topology, enabling bidirectional flow of electrical energy. A combined heat and power (CCHP) system is implemented, consisting of an internal combustion engine, a waste heat boiler, and an absorption chiller. The internal combustion engine is a four-stroke diesel engine with a rated power of 3... 4MW, fuel consumption rate ≤190g / kWh, waste heat boiler, fire-tube design, producing 1.5MPa saturated steam, thermal efficiency ≥85%, absorption chiller, double-effect lithium bromide unit, cooling capacity range 500-2000kW, COP (coefficient of performance) ≥1.2, water electrolysis hydrogen production unit, specifically alkaline electrolyzer, proton exchange membrane (PEM) electrolyzer, hydrogen purification system, alkaline electrolyzer, bipolar design, electrode area 2m², electrolyte is 25% KOH solution from a multi-energy complementary power supply system, proton exchange membrane (PEM)... M) Electrolyzer, thin-layer electrolyzer, membrane electrode thickness ≤200μm, fast dynamic response (≤1s), energy storage subsystem, triggered by energy surplus or demand trough, storing energy and releasing it when insufficient, electrochemical energy storage: lithium-ion battery / flow battery stores electrical energy, flywheel energy storage smooths out instantaneous fluctuations (response time ≤5ms), mechanical energy storage: pumped hydro storage pumps water to the upper reservoir during trough periods and releases water to generate electricity during peak periods, hydrogen energy storage: hydrogen compressor compresses electrolyzed hydrogen to a 35MPa storage tank, fuel cell converts hydrogen energy into electrical energy during peak demand periods.

[0025] By setting up an energy storage subsystem and an energy management and control subsystem, a closed-loop control of the entire process of "storage-scheduling-optimization" is realized. The storage subsystem provides energy regulation capabilities in multiple technologies and all scenarios to balance the intermittency of renewable energy. At the same time, the management and control subsystem optimizes the use of storage resources and reduces operating costs through intelligent algorithms and real-time communication. The two work together to improve the system's reliability (annual power outage time <1 hour), efficiency (PER≥85%), and environmental protection (annual CO2 emission reduction of tens of thousands of tons).

[0026] The energy distribution and transmission subsystem is triggered by the need to transmit energy after conversion or storage to the user end. Power transmission: High-voltage GIS boosts the voltage to 110kV for transmission; low-voltage intelligent distribution cabinets improve power quality through APF / SVG before supplying power to users. Heat transmission: Pre-insulated pipes transport waste heat or molten salt heat storage from the combined heat and power (CCHP) system to the heat exchange station; plate heat exchangers adjust the heating temperature. Smart metering: Smart meters bidirectionally measure user electricity consumption / generation and upload data in real time via HPLC carrier communication. User testing system: Triggering conditions include real-time monitoring and optimization during system operation. Energy Management System (EMS) scheduling: Based on a cloud computing platform integrating AI algorithms, combined with WRF weather forecasts and LSTM load prediction data, an economic dispatch plan is formulated. Microgrid control: Redundant PLCs perform grid-connected / islanding switching (time ≤ 100ms) and adjust frequency / voltage to a stable range. Communication and collaboration: Industrial Ethernet and LoRaWAN networks transmit data to ensure information synchronization among subsystems (time synchronization accuracy ≤ 1μs). Protection and security. Subsystems, triggering conditions requiring real-time monitoring and optimization during system operation, include: Relay protection: Fiber optic differential protection for rapid isolation of line faults (action time ≤ 3ms); Generator protection to prevent overcurrent / demagnetization; Lightning protection grounding: Zinc oxide surge arresters to limit lightning overvoltage (residual voltage ≤ 1.5kV); Copper-clad steel grounding bodies to ensure grounding resistance ≤ 1Ω; Fire early warning: Heptafluoropropane fire extinguishing devices for automatic fire detection (response time ≤ 30s); Infrared thermal imagers to monitor equipment temperature anomalies (accuracy ±2°C). Auxiliary service subsystems, triggering conditions requiring maintenance or environmental treatment during system operation, include: Predictive maintenance: Drone inspections equipped with infrared thermal imagers to detect equipment overheating (coverage radius ≥ 5km); SKF vibration analysis to diagnose bearing faults; Environmental treatment: SCR devices to remove NOx from gas turbine exhaust (efficiency ≥ 90%); Sound barriers to reduce noise (effect ≥ 25dB(A)); Data monitoring: Fluke multi-energy complementary power supply system 1738 power quality analyzer recording 1000+ parameters; Multi-parameter gas sensors to monitor the environment (CO2 / CH4 / H2S). By establishing protection and safety subsystems and auxiliary service subsystems, the system uses smart circuit breakers to monitor current in real time and disconnect faulty lines within 0.1 seconds to prevent equipment burnout or fire caused by short circuits or overloads. It also prevents the "island effect" from endangering the safety of maintenance personnel or damaging equipment. Furthermore, it collects user electricity consumption data through smart meters and generates energy efficiency reports using AI algorithms, helping users reduce electricity costs by 10%-15%. The system can build multiple layers of protection from equipment to system, ensuring the safety of personnel, equipment, and data. At the same time, it improves system adaptability and reduces operating costs through services such as demand response and peak shaving and frequency regulation.

[0027] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A multi-energy complementary power supply system, comprising an energy input subsystem, an energy conversion subsystem, an energy storage subsystem, an energy management and control subsystem, an energy distribution and transmission subsystem, a user-side subsystem, a protection and safety subsystem, and an auxiliary service subsystem; Its features are: The energy input subsystem includes a solar power generation module, a wind power generation module, a hydropower generation module, a biomass energy module, and a fossil fuel module; The energy conversion subsystem includes a power electronic converter, a combined heat and power (CCHP) system, and a water electrolysis hydrogen production unit; The energy storage subsystem includes electrochemical energy storage, mechanical energy storage, thermal energy storage, and hydrogen energy storage; The energy management and control subsystem includes an energy management system (EMS), a microgrid controller, prediction and optimization algorithms, and a communication network. The energy distribution and transmission subsystem includes a power distribution network, heat pipelines, and smart meters; The user-side subsystem includes smart loads, electric vehicle charging stations, and home energy management systems (HEMS). The protection and safety subsystem includes relay protection devices, lightning protection and grounding systems, fire protection systems, and security monitoring cameras; The auxiliary service subsystem includes maintenance and repair equipment, metering and monitoring instruments, and environmental protection facilities.

2. The multi-energy complementary power supply system according to claim 1, characterized in that: When the solar power generation module is working, the back of some photovoltaic panels can receive reflected light from the ground, increasing power generation by 5%-20%, and (single-axis tracking system) can increase annual power generation by 15%-25%, (dual-axis tracking system) can increase it by more than 30%; When the fossil fuel module is in operation, it uses ultra-low sulfur diesel (sulfur content ≤10ppm) and is equipped with an oxidation catalyst (DOC) to reduce particulate matter emissions; The biomass energy module includes a gasifier with a drying zone, a pyrolysis zone, a reduction zone, and an oxidation zone, which improves the quality of the gas (calorific value ≥5MJ / m³). At the same time, CO2 and H2S are removed by water washing or membrane separation, increasing the methane content of the biogas to 50%-70%.

3. The multi-energy complementary power supply system according to claim 1, characterized in that: The power electronic converter is specifically a three-level inverter and a bidirectional DC / DC converter; The three-level inverter adopts a neutral point clamp (NPC) topology, and its output voltage waveform is closer to a sine wave with a harmonic content of ≤3%. A bidirectional DC / DC converter, based on LLC resonant topology, enables bidirectional flow of electrical energy; The combined heat and power (CCHP) system specifically comprises an internal combustion engine, a waste heat boiler, and an absorption chiller. Internal combustion engine, four-stroke diesel engine, rated power 3.4MW, fuel consumption rate ≤190g / kWh; Waste heat boiler, fire-tube design, generates 1.5MPa saturated steam with a thermal efficiency of ≥85%; Absorption chiller, double-effect lithium bromide unit, cooling capacity range 500-2000kW, COP (coefficient of performance) ≥1.2; The water electrolysis hydrogen production device specifically includes an alkaline electrolyzer, a proton exchange membrane (PEM) electrolyzer, and a hydrogen purification system. Alkaline electrolytic cell, bipolar design, electrode area 2m², electrolyte is 25% KOH solution from a multi-energy complementary power supply system; Proton exchange membrane (PEM) electrolyzer, thin-layer electrolytic cell, membrane electrode thickness ≤200μm, fast dynamic response (≤1s).

4. The multi-energy complementary power supply system according to claim 1, characterized in that: The energy storage subsystem is triggered to store energy when there is an energy surplus or a low demand, and to release it when there is a shortage. Electrochemical energy storage: Lithium-ion batteries / flow batteries store electrical energy, and flywheel energy storage smooths out instantaneous fluctuations (response time ≤ 5ms). Mechanical energy storage: Pumped storage pumps water to the upper reservoir during off-peak hours and releases water to generate electricity during peak hours; Hydrogen energy storage: The hydrogen compressor compresses the electrolyzed hydrogen into a 35MPa storage tank, and the fuel cell converts the hydrogen energy into electrical energy during peak demand periods.

5. A multi-energy complementary power supply system according to claim 1, characterized in that: The energy distribution and transmission subsystem, after being triggered by energy conversion or storage, needs to be delivered to the user end; Power transmission: The high-voltage GIS boosts the power to 110kV for transmission, and the low-voltage intelligent distribution cabinet improves the power quality before supplying it to users; Heat transfer: Pre-insulated pipes transport waste heat or molten salt heat storage from the combined heat and power (CCHP) system to the heat exchange station, and plate heat exchangers adjust the heating temperature. Smart metering: Smart meters measure users' electricity consumption / generation bidirectionally and upload data in real time via HPLC carrier communication.

6. A multi-energy complementary power supply system according to claim 1, characterized in that: The user-side subsystem requires real-time monitoring and optimization of triggering conditions during system operation. The Energy Management System (EMS) scheduling: Based on a cloud computing platform integrating AI algorithms, combined with WRF weather forecasts and LSTM load forecast data, an economic scheduling plan is formulated; Microgrid control: Redundant PLCs perform grid-connected / islanded switching (time ≤ 100ms) and adjust frequency / voltage to a stable range; Communication and coordination: Data is transmitted between industrial Ethernet and LoRaWAN networks to ensure information synchronization among subsystems (time synchronization accuracy ≤1μs).

7. A multi-energy complementary power supply system according to claim 1, characterized in that: The protection and security subsystem requires real-time monitoring and optimization during system operation to trigger conditions. Relay protection: Fiber optic differential protection quickly isolates line faults (operation time ≤3ms); generator protection prevents overcurrent / loss of excitation. Lightning protection grounding: Zinc oxide surge arresters limit lightning overvoltage (residual voltage ≤1.5kV), and copper-clad steel grounding bodies ensure grounding resistance ≤1Ω; Fire alarm: Heptafluoropropane fire extinguishing device automatically detects fire (response time ≤30s), infrared thermal imager monitors equipment for temperature anomalies (accuracy ±2°C).

8. A multi-energy complementary power supply system according to claim 1, characterized in that: The auxiliary service subsystem is triggered when the system requires maintenance or environmental protection treatment during operation. Predictive maintenance: UAV inspection equipped with infrared thermal imager to detect overheating (coverage radius ≥ 5km), SKF vibration analysis to diagnose bearing faults; Environmental protection measures: SCR device removes NOx from gas turbine exhaust gas (efficiency ≥90%), sound barrier reduces noise (effect ≥25dB(A)); Data monitoring: Fluke multi-energy complementary power supply system 1738 power quality analyzer records 1000+ parameters, multi-parameter gas sensor monitors the environment (CO2 / CH4 / H2S).

Images