Micro-grid system based on wind-solar-storage-alcohol-hydrogen multi-energy complement and energy management method thereof

Abstract

The application discloses a micro-grid system based on wind-solar-storage-methanol-hydrogen multi-energy complementation and an energy management method thereof, and relates to the technical field of micro-grid energy management. In the micro-grid system based on wind-solar-storage-methanol-hydrogen multi-energy complementation, photovoltaic panels and wind turbines are used to generate electric energy and send the generated electric energy to energy storage batteries and an external power grid; the energy storage batteries are used to store electric energy and send the electric energy to the external power grid; a battery management system is used to collect the electric quantity of the energy storage batteries in real time and send the electric quantity to an energy management system; and the energy management system is used to control a methanol-to-hydrogen power generation system to generate supplementary power based on the electric quantity. The application can improve the system operation stability.

Description

Technical Field

[0001] The present application relates to the field of microgrid energy management technology, and in particular to a microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity and its energy management method. Background Art

[0002] The widespread use of fossil fuels for power generation today has resulted in the production of significant amounts of greenhouse gases, severely impacting the living environment and posing a threat to the sustainable development of human society. Wind, solar, and hydrogen energy, as major green and pollution-free energy sources, can generate electricity without toxic or harmful emissions, and are a key development trend today and in the future.

[0003] Wind, solar, and hydrogen storage integration refers to the close integration of multiple links, including wind and solar power generation, hydrogen production, and storage, to form a complete industrial chain. This industry chain, based on wind and solar power generation, uses photovoltaic and wind power generation technologies to convert solar and wind energy into electricity, providing clean and stable energy for the entire industrial production process. This is more environmentally friendly than fossil fuel generation. Building on wind and solar power generation, hydrogen production from water electrolysis and methanol has become key components of this integrated technology. Hydrogen produced from renewable energy sources such as wind and solar is considered truly zero-carbon "green hydrogen." It can be used for energy storage to address the intermittent nature of solar and wind power, and it can also replace gray hydrogen produced from traditional fossil fuels, reducing carbon emissions in industrial production processes. This technology holds enormous potential for energy transition and the development of the chemical industry. Air-source heat pumps operate on the principle of the reverse Carnot cycle. The compressor system absorbs heat from the air to produce hot water. Air-source water heaters do not require sunlight; as long as there is air at a temperature above zero degrees Celsius, they can operate 24 hours a day under pressure. It fundamentally eliminates the problem of electric water heater leakage, overcomes the shortcomings of solar water heaters such as being unusable on rainy days and being inconvenient to install, and has many advantages such as high safety, high energy saving, and long life.

[0004] However, wind and solar power generation are somewhat unstable. When weather conditions are poor, the power generation is far less than expected. Among them, hydrogen production is the key link connecting wind, solar and hydrogen integration, but the current mainstream water electrolysis hydrogen production has problems such as high catalyst cost, large total electricity consumption, and low operational stability. Methanol hydrogen production also requires a large amount of heat absorption for reforming hydrogen production, so a large amount of stable heat source is needed to create a reforming environment. At the same time, the hydrogen produced needs to be stored in hydrogen storage tanks, which have certain safety hazards and are prone to hydrogen leakage incidents. The safety factor is low, and the use of hydrogen tanks also further increases the cost of use. Air-source heat pumps have the problem of being unable to stably produce hot water in low-temperature environments. The current mainstream solution is still to use traditional combustion chambers to burn high-temperature fuel gas for heating, which causes great pollution to the environment and is not conducive to the promotion of low-carbon environmental protection. The use of hydrogen combustion chambers also has the problem that hydrogen cannot be fully mixed with air, and there is a local concentration of excessive fuel, resulting in high local equivalence ratios and high-temperature hot spots that produce a large amount of nitrogen oxides.

[0005] Therefore, a microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity and its energy management method are needed to solve the above problems. Summary of the Invention

[0006] The purpose of this application is to provide a microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity and its energy management method to improve the system operation stability.

[0007] To achieve the above objectives, this application provides the following solutions.

[0008] In a first aspect, the present application provides a microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity, including: photovoltaic panels, wind turbines, energy storage batteries, battery management systems, methanol hydrogen production power generation systems, air energy hot water circulation systems and energy management systems; the photovoltaic panels, the wind turbines and the methanol hydrogen production power generation system are all connected to the external power grid; the photovoltaic panels, the wind turbines, the energy storage batteries, the battery management system and the methanol hydrogen production power generation system are all connected to the energy storage batteries; the battery management system, the methanol hydrogen production power generation system and the air energy hot water circulation system are all connected to the energy management system;

[0009] The photovoltaic panels and wind turbines are both used to generate electrical energy and send the generated electrical energy to the energy storage battery and the external power grid;

[0010] The energy storage battery is used to store electrical energy and send electrical energy to the external power grid;

[0011] The battery management system is used to collect the power of the energy storage battery in real time and send the power to the energy management system;

[0012] The energy management system is used to regulate the methanol-to-hydrogen power generation system to perform supplementary power generation based on the power quantity.

[0013] In one embodiment, the methanol-to-hydrogen power generation system includes: a solution storage tank, a heat exchanger, a reforming chamber, a solid oxide fuel cell and a regulating valve; the air-to-hot water circulation system includes: an air-to-heat pump, a temperature sensor and a hydrogen combustion chamber;

[0014] The solution storage tank is connected to the reforming chamber via the heat exchanger, the reforming chamber is connected to the solid oxide fuel cell and the hydrogen combustion chamber respectively via the regulating valve, the hydrogen combustion chamber is connected to the air-energy heat pump via a pipeline, and the temperature sensor is provided on the air-energy heat pump; the temperature sensor and the regulating valve are both connected to the energy management system; the solid oxide fuel cell is connected to an external power grid;

[0015] The solution storage tank stores a methanol / water solution with a set water-to-alcohol ratio;

[0016] The heat exchanger performs heat exchange on the methanol / water solution stored and transported by the solution storage tank and then transports the solution into the reforming chamber;

[0017] The reforming chamber is used to process the methanol / water solution to obtain hydrogen-rich gas;

[0018] The temperature sensor is used to collect the temperature of water after circulating through the air energy heat pump;

[0019] The energy management system is further configured to adjust the ratio of the hydrogen-rich gas entering the solid oxide fuel cell and the hydrogen combustion chamber through the regulating valve based on the temperature of the water circulated through the air energy heat pump;

[0020] The solid oxide fuel cell is used to generate electrical energy using the hydrogen-rich gas;

[0021] The hydrogen combustion chamber is used to burn the hydrogen-rich gas to generate high-temperature combustion gas and heat the water in the pipeline.

[0022] In one embodiment, the microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity further includes: a bidirectional DC / DC converter and an AC / DC converter;

[0023] The photovoltaic panel is connected to the energy storage battery via the bidirectional DC / DC converter;

[0024] The wind turbine is connected to the energy storage battery through the AC / DC converter.

[0025] In one embodiment, the microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity further includes: the photovoltaic controller and the wind turbine controller;

[0026] The photovoltaic controller is used to control the photovoltaic panel to generate electrical energy and send the generated electrical energy to the energy storage battery and the external power grid;

[0027] The wind turbine controller is used to control the wind turbine to generate electrical energy and send the generated electrical energy to the energy storage battery and the external power grid.

[0028] In one embodiment, the methanol-to-hydrogen power generation system further comprises: a unidirectional DC / DC converter;

[0029] The solid oxide fuel cell is connected to an external power grid through the unidirectional DC / DC converter.

[0030] In one embodiment, the air-energy hot water circulation system further comprises: a water reservoir; the water reservoir is connected to the hydrogen combustion chamber and the air-energy heat pump respectively;

[0031] The water reservoir is used to store water and provide water for the air energy heat pump.

[0032] In a second aspect, the present application provides an energy management method for a microgrid system based on wind, solar, alcohol, and hydrogen multi-energy complementarity, which is used to manage the energy of the microgrid system based on wind, solar, alcohol, and hydrogen multi-energy complementarity. The energy management method for the microgrid system based on wind, solar, alcohol, and hydrogen multi-energy complementarity includes:

[0033] Obtain the total electricity consumption of all electrical devices in the microgrid system in the Mth month of each historical year in the historical period and the power generation of each power generation system in the Mth month of each historical year in the historical period; the power generation systems are photovoltaic panels, wind turbines, and methanol-to-hydrogen power generation systems; the historical period is the period before the current year; M=1, 2, ..., 12;

[0034] Determine any historical year in the historical period as the target historical year, and determine any power generation system as the current power generation system;

[0035] Based on the total electricity consumption of the Mth month of the target historical year, determine whether the Mth month of the target historical year belongs to the peak electricity consumption period, and determine the target historical year that belongs to the peak electricity consumption period as the peak electricity consumption year;

[0036] Based on the power generation of the current power generation system in the Mth month of the target historical year, determine whether the Mth month of the target historical year belongs to the peak power generation period of the current power generation system, and determine the target historical year that belongs to the peak power generation period of the current power generation system as the peak power generation period year of the current power generation system;

[0037] Based on all peak electricity consumption years and all peak electricity generation years of the current power generation system, determine whether the current power generation system matches each power-consuming device, and determine each power generation system that matches each power-consuming device as a matching power generation system;

[0038] In the Mth month of the current year, each electrical device is powered by each matching power generation system and / or energy storage battery and / or external power generation device.

[0039] In one embodiment, in the Mth month of the current year, each matching power generation system and / or energy storage battery and / or external power generation device is used to power each electrical device, including:

[0040] Photovoltaic panels and wind turbines are both identified as primary power generation systems;

[0041] When the number of matching power generation systems is 3, based on the power generation of the two primary power generation systems in the Mth month of the peak power generation year and the total power consumption in the Mth month of the peak power consumption year, it is determined whether the power demand in the Mth month of the current year is met, and a first judgment result is obtained;

[0042] If the first judgment result is yes, then in the Mth month of the current year, two primary power generation systems are used to supply power to each electrical device;

[0043] If the first judgment result is no, then based on the power generation of the two primary power generation systems in the Mth month of the peak power generation year, the power generation of the methanol-to-hydrogen power generation system in the Mth month of the peak power generation year, and the total electricity consumption in the Mth month of the peak power consumption year, it is determined whether the electricity demand for the Mth month of the current year is met, and a second judgment result is obtained;

[0044] If the second judgment result is yes, then in the Mth month of the current year, the two primary power generation systems and the methanol-to-hydrogen power generation system are used to jointly supply power to the electrical equipment;

[0045] If the second judgment result is no, then in the Mth month of the current year, the two primary power generation systems, the methanol-to-hydrogen power generation system, and the energy storage battery are used to jointly power each electrical device; and when the power of the energy storage battery is less than the preset power, the two primary power generation systems, the methanol-to-hydrogen power generation system, and the external power generation device are used to jointly power each electrical device;

[0046] When the number of matched power generation systems is two and includes two primary power generation systems, a third judgment result is obtained by determining whether the electricity demand for the Mth month of the current year is met based on the power generation of the two primary power generation systems in the Mth month of the peak power generation year and the total electricity consumption in the Mth month of the peak power consumption year.

[0047] If the third judgment result is yes, then in the Mth month of the current year, two primary power generation systems are used to supply power to each electrical device;

[0048] If the result of the third judgment is no, then in the Mth month of the current year, the two primary power generation systems and the energy storage battery are used to jointly power each electrical device, and when the power level of the energy storage battery is less than the preset power level, the two primary power generation systems and the external power generation device are used to jointly power each electrical device;

[0049] When the number of matched power generation systems is two and includes one primary power generation system and a methanol-to-hydrogen power generation system, based on the power generation of the one primary power generation system in the Mth month of the peak power generation year and the total power consumption in the Mth month of the peak power consumption year, it is determined whether the power demand in the Mth month of the current year is met, thereby obtaining a fourth judgment result;

[0050] If the fourth judgment result is yes, then in the Mth month of the current year, one primary power generation system is used to supply power to each electrical device;

[0051] If the fourth judgment result is no, then based on the power generation of one primary power generation system in the Mth month of the peak power generation year, the power generation of the methanol-to-hydrogen power generation system in the Mth month of the peak power generation year, and the total electricity consumption in the Mth month of the peak power consumption year, it is determined whether the electricity demand for the Mth month of the current year is met, and a fifth judgment result is obtained;

[0052] If the result of the fifth judgment is yes, then in the Mth month of the current year, one primary power generation system and the methanol-to-hydrogen power generation system are used to jointly supply power to each electrical device;

[0053] If the result of the fifth judgment is no, then in the Mth month of the current year, one primary power generation system, the methanol-to-hydrogen power generation system, and the energy storage battery are used to jointly power each electrical device; and when the power level of the energy storage battery is less than the preset power level, one primary power generation system, the methanol-to-hydrogen power generation system, and the external power generation device are used to jointly power each electrical device;

[0054] When the number of matched power generation systems is 1, based on the power generation of the matched power generation system in the Mth month of the peak power generation year and the total power consumption in the Mth month of the peak power consumption year, it is determined whether the power demand in the Mth month of the current year is met, thereby obtaining a sixth determination result.

[0055] If the sixth judgment result is yes, then in the Mth month of the current year, one matching power generation system is used to supply power to each electrical device;

[0056] If the result of the sixth judgment is no, then in the Mth month of the current year, a matching power generation system and an energy storage battery are used to jointly power each electrical device, and when the power of the energy storage battery is less than the preset power, the matching power generation system and an external power generation device are used to jointly power each electrical device.

[0057] In one embodiment, based on the total electricity consumption of the Mth month of the target historical year, determining whether the Mth month of the target historical year belongs to the peak electricity consumption period, and determining the target historical year that belongs to the peak electricity consumption period as the peak electricity consumption year includes:

[0058] When the total electricity consumption of the Mth month of the target historical year satisfies the peak electricity consumption period judgment formula, the Mth month of the target historical year is determined to be a peak electricity consumption period, and the target historical year is determined as the peak electricity consumption period year; the peak electricity consumption period judgment formula includes:

[0059] ;

[0060] ;

[0061] in, is the total electricity consumption in the Mth month of any historical year; is the number of electrical equipment; is the actual electricity consumption of the i-th electrical equipment in the M-th month of the historical year; is the rated power consumption of the i-th electrical equipment.

[0062] In one embodiment, based on the power generation of the current power generation system in the Mth month of the target historical year, determining whether the Mth month of the target historical year belongs to the peak power generation period of the current power generation system, and determining the target historical year belonging to the peak power generation period of the current power generation system as the peak power generation period year of the current power generation system includes:

[0063] When the power generation of the current power generation system in the Mth month of the target historical year satisfies the power generation peak period judgment formula, it is determined that the Mth month of the target historical year belongs to the power generation peak period, and the target historical year is determined as the power generation peak period year of the current power generation system; the power generation peak period judgment formula is:

[0064] ;

[0065] in, For power generation systems The power generation in the Mth month of the target historical year, , When the power generation system is photovoltaic panels, When the power generation system is a wind turbine, When, the power generation system is a methanol-to-hydrogen power generation system; For power generation systems The preset power generation threshold.

[0066] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0067] The present application discloses a microgrid system based on wind, solar, alcohol, and hydrogen multi-energy complementation and its energy management method. Specifically, the microgrid system based on wind, solar, and alcohol, and hydrogen multi-energy complementation changes the traditional wind, solar, and hydrogen integration concept, converts hydrogen storage into alcohol, and uses methanol reforming to produce hydrogen. This allows online hydrogen production and use as it is produced, avoiding the additional costs and safety hazards of using hydrogen storage equipment. The methanol-to-hydrogen power generation system is combined with an energy storage battery, effectively addressing the large amount of heat required for methanol reforming and, as a backup energy supply device, effectively solving the problem of unstable power generation when both wind and photovoltaic power are paralyzed. A hydrogen combustion chamber is thermally coupled with an air-energy heat pump, and hydrogen-rich gas is used as fuel, avoiding the problem of large amounts of pollutant emissions generated by traditional diesel engines. A solid oxide fuel cell is coupled with the hydrogen combustion chamber, converting the chemical energy of the hydrogen-rich gas into electrical energy. The high-temperature combustion gas generated by combustion in the combustion chamber provides a sufficient heat source for the air-energy heat pump and methanol reforming reaction, increasing the energy utilization of the hydrogen-rich gas, achieving cogeneration, and improving the operational stability of the microgrid system based on wind, solar, and alcohol, and hydrogen multi-energy complementation. In the energy management method for a microgrid system based on the multi-energy complementarity of wind, solar, alcohol, and hydrogen, the total electricity consumption in the Mth month of multiple historical years and the power generation of each power generation system are used to determine the peak electricity consumption year and the peak power generation year of each power generation system. The power generation systems are then matched, so that in the Mth month of the current year, each matching power generation system and / or energy storage battery and / or external power generation device can be used to power each electrical device. This method implements energy management for the microgrid system based on the multi-energy complementarity of wind, solar, alcohol, and hydrogen, and improves the operational stability of the microgrid system based on the multi-energy complementarity of wind, solar, alcohol, and hydrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0069] Figure 1 This is a schematic diagram of the microgrid system structure based on wind, solar, alcohol storage and hydrogen multi-energy complementarity provided in one embodiment of the present application.

[0070] Figure 2 Schematic diagram of the combustion chamber structure.

[0071] Figure 3 A flowchart of an energy management method based on a wind-solar-storage-methanol-hydrogen multi-energy complementary microgrid system. DETAILED DESCRIPTION

[0072] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0073] The purpose of the present application is to provide a wind-solar-storage-methanol-hydrogen multi-energy complementary microgrid system and an energy management method thereof, aiming to improve the system operation stability.

[0074] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0075] In an exemplary embodiment, as shown in Figure 1 A wind-solar-storage-methanol-hydrogen multi-energy complementary microgrid system is provided, comprising a photovoltaic panel, a wind turbine, an energy storage battery, a battery management system, a methanol hydrogen power generation system, an air energy hot water circulation system and an energy management system; the photovoltaic panel, the wind turbine and the methanol hydrogen power generation system are connected with an external power grid; the photovoltaic panel, the wind turbine, the energy storage battery, the battery management system and the methanol hydrogen power generation system are connected with the energy storage battery; the battery management system, the methanol hydrogen power generation system and the air energy hot water circulation system are connected with the energy management system.

[0076] The photovoltaic panel and the wind turbine are both used to generate electric energy and send the generated electric energy to the energy storage battery and the external power grid.

[0077] The energy storage battery is used to store electric energy and send the electric energy to the external power grid.

[0078] The battery management system is used to collect the electric quantity of the energy storage battery in real time and send the electric quantity to the energy management system.

[0079] The energy management system is used to regulate the methanol hydrogen power generation system to generate power based on the electric quantity.

[0080] Specifically, when the power of the energy storage battery is lower than the preset power, the adjusting valve is set to a delivery mode mainly using the methanol hydrogen production power generation system, and the hydrogen-rich gas produced by the reforming chamber is delivered to the methanol hydrogen production power generation system in whole or in part to generate power, so as to supplement the power reserve lost by the energy storage battery; when the temperature sensor of the air energy heat pump detects that the hot water circulated by the air energy heat pump does not reach the set hot water temperature, the mode of the adjusting valve is changed, and part of the hydrogen-rich gas produced in the reforming chamber is delivered into the hydrogen combustion chamber, the high-temperature combustion gas produced by mixing and burning hydrogen in the hydrogen-rich gas and air is used to heat the water that does not reach the set water temperature, and stable hot water supply is realized through heat exchange between the combustion chamber and the pipeline; if the above problems occur in the energy storage battery and the air energy heat pump at the same time, the hydrogen delivery ratio of the adjusting valve is controlled in real time according to the existing simulation experimental data, and a suitable energy conversion mode is maintained.

[0081] The photovoltaic panel, the wind turbine and the methanol hydrogen production power generation system are connected to the external power grid through the PCS converter.

[0082] As an optional implementation, the methanol hydrogen production power generation system comprises a solution storage tank, a heat exchanger, a reforming chamber, a solid oxide fuel cell and an adjusting valve; and the air energy hot water circulation system comprises an air energy heat pump, a temperature sensor and a hydrogen combustion chamber.

[0083] The solution storage tank is connected to the reforming chamber through the heat exchanger, the reforming chamber is connected to the solid oxide fuel cell and the hydrogen combustion chamber through the adjusting valve, the hydrogen combustion chamber is connected to the air energy heat pump through a pipeline, and the temperature sensor is arranged on the air energy heat pump; the temperature sensor and the adjusting valve are connected to an energy management system; and the solid oxide fuel cell is connected to the external power grid.

[0084] The solution storage tank stores the methanol / water solution with a set water-methanol ratio.

[0085] The heat exchanger exchanges heat of the methanol / water solution delivered from the solution storage tank and then delivers the solution into the reforming chamber.

[0086] The reforming chamber is used for treating the methanol / water solution to obtain hydrogen-rich gas.

[0087] The temperature sensor is used for collecting the temperature of the water circulated by the air energy heat pump.

[0088] The energy management system is further used for adjusting the proportion of the hydrogen-rich gas entering the solid oxide fuel cell and the hydrogen combustion chamber through the adjusting valve based on the temperature of the water circulated by the air energy heat pump.

[0089] The solid oxide fuel cell is used for generating electric energy by using the hydrogen-rich gas.

[0090] The hydrogen combustion chamber is used for burning the hydrogen-rich gas to generate high-temperature combustion gas and heat the water in the pipeline.

[0091] Specifically, the energy storage battery is a liquid flow battery. By using a large-capacity liquid flow battery as an energy storage device, on the one hand, the electrical energy converted from wind energy, light energy and alcohol-hydrogen chemical energy is stored, ensuring the stability and safety of the microgrid system during actual use. On the other hand, the large-capacity characteristics of the liquid flow battery can provide effective protection for the heat source required for the methanol reforming stage.

[0092] A portion of the hydrogen-rich gas enters the cathode of the solid oxide fuel cell for reaction, which converts the chemical energy of the hydrogen in the hydrogen-rich gas into electrical energy and supplies the electrical energy to the energy storage battery and the external power grid; the other portion of the hydrogen-rich gas enters the hydrogen combustion chamber, and air is introduced into the combustion chamber to fully mix with the hydrogen in the hydrogen-rich gas before combustion.

[0093] like Figure 2 As shown, the hydrogen combustion chamber is annular. Air enters the chamber through the air inlet. A portion of the air enters the hydrogen combustion chamber entrance for combustion. The hydrogen combustion chamber entrance has numerous micropores with hydrogen nozzles in the micropores. The hydrogen injection device is connected to the combustion chamber through the hydrogen nozzle. Air enters the combustion chamber micropores and is fully mixed with the hydrogen in the hydrogen-rich gas ejected from the hydrogen nozzle before being burned in the hydrogen combustion chamber. Another portion of air flows upward into the upper chamber, where it enters the hydrogen combustion chamber through side holes. This dilutes the high-temperature combustion gas to prevent nitrogen oxides from being produced due to excessive hydrogen combustion temperature. At the same time, the high-temperature combustion gas is guided to the inside of the hydrogen combustion chamber, allowing for sufficient heat exchange between the gas and the water in the pipeline. The gas after heat exchange is discharged through the exhaust port. The diameter of the hydrogen combustion chamber micropores should not be too large. If the micropore diameter is too large, the micropore injection velocity will be slowed, which will cause hydrogen to burn in the boundary layer and lead to flashback.

[0094] As an optional implementation, the microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity also includes: a bidirectional DC / DC converter and an AC / DC converter.

[0095] The photovoltaic panels are connected to the energy storage battery through a bidirectional DC / DC converter.

[0096] The wind turbine is connected to the energy storage battery through an AC / DC converter.

[0097] Specifically, the electricity generated by photovoltaic and wind power is input into the energy storage battery through a bidirectional DC / DC converter.

[0098] As an optional implementation, the microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity also includes: a photovoltaic controller and a wind turbine controller.

[0099] The photovoltaic controller is used to control the photovoltaic panels to generate electricity and send the generated electricity to the energy storage battery and the external power grid.

[0100] The wind turbine controller is used to control the wind turbine to generate electrical energy and send the generated electrical energy to the energy storage battery and the external power grid.

[0101] Specifically, the photovoltaic panels are controlled and activated by a photovoltaic controller. Sunlight strikes the surface of the photovoltaic cells, and the semiconductor material absorbs the energy of the photons. The absorbed energy causes electrons to transition from the valence band to the conduction band, forming a current and generating electrical energy. The wind turbine controller controls and activates the wind turbine. The wind turbine uses the wind to rotate its blades, and the speed increaser increases the speed, prompting the generator to generate electricity and achieve normal wind power generation.

[0102] As an optional implementation, the methanol-to-hydrogen power generation system further includes: a unidirectional DC / DC converter.

[0103] The solid oxide fuel cell is connected to the external power grid through a unidirectional DC / DC converter.

[0104] As an optional implementation, the air-energy hot water circulation system further includes: a water reservoir; the water reservoir is connected to the hydrogen combustion chamber and the air-energy heat pump respectively.

[0105] The water reservoir is used to store water and provide water for the air energy heat pump.

[0106] In an exemplary embodiment, Figure 3 As shown, an energy management method for a microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity is provided, which is used to perform energy management on a microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity. The energy management method for a microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity includes the following steps.

[0107] Step 1: Obtain the total electricity consumption of all electrical devices in the microgrid system in the Mth month of each historical year in the historical period and the power generation of each power generation system in the Mth month of each historical year in the historical period.

[0108] The power generation systems are photovoltaic panels, wind turbines, and methanol-to-hydrogen power generation systems; the historical period is the period before the current year; M = 1, 2, …, 12.

[0109] Specifically, the total electricity consumption of all electrical equipment in the microgrid system in the Mth month of each historical year in the historical period and the power generation of each power generation system in the Mth month of each historical year in the historical period are obtained through the monitoring center in the microgrid system.

[0110] Step 2: Determine any historical year in the historical period as the target historical year, and determine any power generation system as the current power generation system.

[0111] Step 3: Based on the total electricity consumption in the Mth month of the target historical year, determine whether the Mth month of the target historical year belongs to the peak electricity consumption period, and determine the target historical year that belongs to the peak electricity consumption period as the peak electricity consumption year.

[0112] As an optional implementation, step 3 includes:

[0113] When the total electricity consumption of the Mth month of the target historical year meets the peak electricity consumption period judgment formula, the Mth month of the target historical year is determined to be the peak electricity consumption period, and the target historical year is determined as the peak electricity consumption year; the peak electricity consumption period judgment formula includes:

[0114] .

[0115] .

[0116] in, is the total electricity consumption in the Mth month of any historical year; is the number of electrical equipment; is the actual electricity consumption of the i-th electrical equipment in the M-th month of the historical year; is the rated power consumption of the i-th electrical equipment.

[0117] Step 4: Based on the power generation of the current power generation system in the Mth month of the target historical year, determine whether the Mth month of the target historical year belongs to the peak power generation period of the current power generation system, and determine the target historical year that belongs to the peak power generation period of the current power generation system as the peak power generation period year of the current power generation system.

[0118] As an optional implementation, step 4 includes:

[0119] When the power generation of the current power generation system in the Mth month of the target historical year meets the power generation peak judgment formula, it is determined that the Mth month of the target historical year belongs to the power generation peak period, and the target historical year is determined as the power generation peak year of the current power generation system; the power generation peak judgment formula is:

[0120] .

[0121] in, For power generation systems The electricity generation in the Mth month of the target historical year, , When the power generation system is photovoltaic panels, When the power generation system is a wind turbine, When, the power generation system is a methanol-to-hydrogen power generation system; For power generation systems The preset power generation threshold.

[0122] Step 5: Based on all peak electricity consumption years and all peak electricity generation years of the current power generation system, determine whether the current power generation system matches each power-consuming device, and determine each power generation system that matches each power-consuming device as a matching power generation system.

[0123] Specifically, step 5 includes:

[0124] When the current power generation system meets the matching judgment formula, it is determined whether the current power generation system matches each power-consuming device, and the current power generation system is determined as a matching power generation system. The matching judgment formula is:

[0125] .

[0126] in, For power generation systems The number of peak power generation years and peak power consumption years is the same, assuming that the historical period consists of 5 years, of which the first, second and third years are the power generation system The first and second years are the peak electricity consumption years. The value of is 2; is the number of peak electricity consumption years in the historical period; is the preset matching threshold.

[0127] Step 6: In the Mth month of the current year, each matching power generation system and / or energy storage battery and / or external power generation device is used to supply power to each electrical device.

[0128] As an optional implementation, step 6 includes the following steps.

[0129] Step 61: Determine the photovoltaic panels and wind turbines as the primary power generation system.

[0130] Step 62: When the number of matched power generation systems is 3, based on the power generation of the two primary power generation systems in the Mth month of the peak power generation year and the total power consumption in the Mth month of the peak power consumption year, determine whether the power demand in the Mth month of the current year is met, and obtain a first judgment result.

[0131] If the first judgment result is yes, then in the Mth month of the current year, two primary power generation systems are used to supply power to each electrical device.

[0132] If the first judgment result is no, then based on the power generation of the two primary power generation systems in the Mth month of the peak power generation year, the power generation of the methanol-to-hydrogen power generation system in the Mth month of the peak power generation year and the total electricity consumption in the Mth month of the peak power consumption year, it is judged whether the electricity demand in the Mth month of the current year is met to obtain the second judgment result.

[0133] If the second judgment result is yes, then in the Mth month of the current year, two primary power generation systems and the methanol hydrogen power generation system are used to jointly supply power to various electrical equipment.

[0134] If the second judgment result is no, then in the Mth month of the current year, two primary power generation systems, a methanol-to-hydrogen power generation system and an energy storage battery are used to jointly supply power to each electrical equipment, and when the power of the energy storage battery is less than the preset power, two primary power generation systems, a methanol-to-hydrogen power generation system and an external power generation device are used to jointly supply power to each electrical equipment.

[0135] Step 63: When the number of matched power generation systems is 2 and includes 2 primary power generation systems, based on the power generation of the two primary power generation systems in the Mth month of the peak power generation year and the total electricity consumption in the Mth month of the peak electricity consumption year, determine whether the electricity demand in the Mth month of the current year is met, and obtain a third judgment result.

[0136] If the third judgment result is yes, then in the Mth month of the current year, two primary power generation systems are used to supply power to each electrical device.

[0137] If the result of the third judgment is no, then in the Mth month of the current year, two primary power generation systems and energy storage batteries are used to jointly power each electrical equipment, and when the power of the energy storage battery is less than the preset power, two primary power generation systems and an external power generation device are used to jointly power each electrical equipment.

[0138] Step 64: When the number of matched power generation systems is 2 and includes 1 primary power generation system and a methanol-to-hydrogen power generation system, based on the power generation of 1 primary power generation system in the Mth month of the peak power generation year and the total electricity consumption in the Mth month of the peak electricity consumption year, determine whether the electricity demand in the Mth month of the current year is met, and obtain the fourth judgment result.

[0139] If the fourth judgment result is yes, then in the Mth month of the current year, one primary power generation system is used to supply power to each electrical device.

[0140] If the fourth judgment result is no, then based on the power generation of a primary power generation system in the Mth month of the peak power generation year, the power generation of the methanol-to-hydrogen power generation system in the Mth month of the peak power generation year and the total electricity consumption in the Mth month of the peak power consumption year, it is judged whether the electricity demand in the Mth month of the current year is met to obtain the fifth judgment result.

[0141] If the fifth judgment result is yes, then in the Mth month of the current year, one primary power generation system and a methanol-to-hydrogen power generation system are used to jointly supply power to various electrical equipment.

[0142] If the fifth determination result is no, in the Mth month of the current year, each of the electrical equipment is powered by one primary power generation system, the methanol-to-hydrogen power generation system and the energy storage battery, and when the amount of electricity of the energy storage battery is less than the preset amount of electricity, each of the electrical equipment is powered by one primary power generation system, the methanol-to-hydrogen power generation system and the external power generation device.

[0143] Step 65: When the number of matched power generation systems is one, whether the power demand in the Mth month of the current year is met is determined based on the power generation amount of the matched power generation system in the Mth month of the power generation peak period year and the total power consumption in the Mth month of the power consumption peak period year, and a sixth determination result is obtained.

[0144] If the sixth determination result is yes, in the Mth month of the current year, each of the electrical equipment is powered by one matched power generation system.

[0145] If the sixth determination result is no, in the Mth month of the current year, each of the electrical equipment is powered by one matched power generation system and the energy storage battery, and when the amount of electricity of the energy storage battery is less than the preset amount of electricity, each of the electrical equipment is powered by the matched power generation system and the external power generation device.

[0146] Specifically, when there are ( ) matched power generation systems, whether the power demand in the Mth month of the current year is met is determined by the following formula:

[0147] .

[0148] wherein, is the number of power generation peak period years in the historical period for the th matched power generation system; is the power generation amount of the th matched power generation system in the Mth month of the th power generation peak period year; is the number of power consumption peak period years in the historical period; is the total power consumption in the Mth month of the th power consumption peak period year; is a preset difference value.

[0149] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the present disclosure.

[0150] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the system, method, and core concept of this application. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of this application. In summary, the contents of this specification should not be construed as limiting this application.

Claims

1. An energy management method for a microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity, characterized in that: The energy management method of the microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity includes: Obtain the total electricity consumption of all electrical devices in the microgrid system in the Mth month of each historical year in the historical period and the power generation of each power generation system in the Mth month of each historical year in the historical period; the power generation systems are photovoltaic panels, wind turbines, and methanol-to-hydrogen power generation systems; the historical period is the period before the current year; M=1, 2, ..., 12; Determine any historical year in the historical period as the target historical year, and determine any power generation system as the current power generation system; Based on the total electricity consumption of the Mth month of the target historical year, determine whether the Mth month of the target historical year belongs to the peak electricity consumption period, and determine the target historical year that belongs to the peak electricity consumption period as the peak electricity consumption year; Based on the power generation of the current power generation system in the Mth month of the target historical year, determine whether the Mth month of the target historical year belongs to the peak power generation period of the current power generation system, and determine the target historical year that belongs to the peak power generation period of the current power generation system as the peak power generation period year of the current power generation system; Based on all peak electricity consumption years and all peak electricity generation years of the current power generation system, determine whether the current power generation system matches each power-consuming device, and determine each power generation system that matches each power-consuming device as a matching power generation system; In the Mth month of the current year, each power-consuming device is supplied with power by each matching power generation system and / or energy storage battery and / or external power generation device; In the Mth month of the current year, each matching power generation system and / or energy storage battery and / or external power generation device is used to supply power to each electrical device, including: Photovoltaic panels and wind turbines are both identified as primary power generation systems; When the number of matching power generation systems is 3, based on the power generation of the two primary power generation systems in the Mth month of the peak power generation year and the total power consumption in the Mth month of the peak power consumption year, it is determined whether the power demand in the Mth month of the current year is met, and a first judgment result is obtained; If the first judgment result is yes, then in the Mth month of the current year, two primary power generation systems are used to supply power to each electrical device; If the first judgment result is no, then based on the power generation of the two primary power generation systems in the Mth month of the peak power generation year, the power generation of the methanol-to-hydrogen power generation system in the Mth month of the peak power generation year, and the total electricity consumption in the Mth month of the peak power consumption year, it is determined whether the electricity demand for the Mth month of the current year is met, and a second judgment result is obtained; If the second judgment result is yes, then in the Mth month of the current year, the two primary power generation systems and the methanol-to-hydrogen power generation system are used to jointly supply power to the electrical equipment; If the second judgment result is no, then in the Mth month of the current year, the two primary power generation systems, the methanol-to-hydrogen power generation system, and the energy storage battery are used to jointly power each electrical device; and when the power of the energy storage battery is less than the preset power, the two primary power generation systems, the methanol-to-hydrogen power generation system, and the external power generation device are used to jointly power each electrical device; When the number of matched power generation systems is two and includes two primary power generation systems, a third judgment result is obtained by determining whether the electricity demand for the Mth month of the current year is met based on the power generation of the two primary power generation systems in the Mth month of the peak power generation year and the total electricity consumption in the Mth month of the peak power consumption year. If the third judgment result is yes, then in the Mth month of the current year, two primary power generation systems are used to supply power to each electrical device; If the result of the third judgment is no, then in the Mth month of the current year, the two primary power generation systems and the energy storage battery are used to jointly power each electrical device, and when the power level of the energy storage battery is less than the preset power level, the two primary power generation systems and the external power generation device are used to jointly power each electrical device; When the number of matched power generation systems is two and includes one primary power generation system and a methanol-to-hydrogen power generation system, based on the power generation of the one primary power generation system in the Mth month of the peak power generation year and the total power consumption in the Mth month of the peak power consumption year, it is determined whether the power demand in the Mth month of the current year is met, thereby obtaining a fourth judgment result; If the fourth judgment result is yes, then in the Mth month of the current year, one primary power generation system is used to supply power to each electrical device; If the fourth judgment result is no, then based on the power generation of one primary power generation system in the Mth month of the peak power generation year, the power generation of the methanol-to-hydrogen power generation system in the Mth month of the peak power generation year, and the total electricity consumption in the Mth month of the peak power consumption year, it is determined whether the electricity demand for the Mth month of the current year is met, and a fifth judgment result is obtained; If the result of the fifth judgment is yes, then in the Mth month of the current year, one primary power generation system and the methanol-to-hydrogen power generation system are used to jointly supply power to each electrical device; If the result of the fifth judgment is no, then in the Mth month of the current year, one primary power generation system, a methanol-to-hydrogen power generation system and an energy storage battery are used to jointly power each electrical device, and when the power of the energy storage battery is less than the preset power, one primary power generation system, a methanol-to-hydrogen power generation system and an external power generation device are used to jointly power each electrical device.

2. The energy management method of the microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity according to claim 1 is characterized in that: When the number of matched power generation systems is 1, based on the power generation of the matched power generation system in the Mth month of the peak power generation year and the total power consumption in the Mth month of the peak power consumption year, it is determined whether the power demand in the Mth month of the current year is met, thereby obtaining a sixth determination result. If the sixth judgment result is yes, then in the Mth month of the current year, one matching power generation system is used to supply power to each electrical device; If the result of the sixth judgment is no, then in the Mth month of the current year, a matching power generation system and an energy storage battery are used to jointly power each electrical device, and when the power of the energy storage battery is less than the preset power, the matching power generation system and an external power generation device are used to jointly power each electrical device.

3. The energy management method of the microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity according to claim 1 is characterized in that: Based on the total electricity consumption in the Mth month of the target historical year, determine whether the Mth month of the target historical year belongs to the peak electricity consumption period, and determine the target historical year that belongs to the peak electricity consumption period as the peak electricity consumption year, including: When the total electricity consumption of the Mth month of the target historical year satisfies the peak electricity consumption period judgment formula, the Mth month of the target historical year is determined to be a peak electricity consumption period, and the target historical year is determined as the peak electricity consumption period year; the peak electricity consumption period judgment formula includes: ； ； in, is the total electricity consumption in the Mth month of any historical year; is the number of electrical equipment; is the actual electricity consumption of the i-th electrical equipment in the M-th month of the historical year; is the rated power consumption of the i-th electrical equipment.

4. The energy management method of a microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity according to claim 1 is characterized in that: Based on the power generation of the current power generation system in the Mth month of the target historical year, determining whether the Mth month of the target historical year belongs to the peak power generation period of the current power generation system, and determining the target historical year belonging to the peak power generation period of the current power generation system as the peak power generation period year of the current power generation system, including: When the power generation of the current power generation system in the Mth month of the target historical year satisfies the power generation peak period judgment formula, it is determined that the Mth month of the target historical year belongs to the power generation peak period, and the target historical year is determined as the power generation peak period year of the current power generation system; the power generation peak period judgment formula is: ； in, For power generation systems The electricity generation in the Mth month of the target historical year, , When the power generation system is photovoltaic panels, When the power generation system is a wind turbine, When, the power generation system is a methanol-to-hydrogen power generation system; For power generation systems The preset power generation threshold.

5. A microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity, used to implement the energy management method of the microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity according to any one of claims 1 to 4, characterized in that: The microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity includes: photovoltaic panels, wind turbines, energy storage batteries, battery management systems, methanol hydrogen production power generation systems, air-energy hot water circulation systems and energy management systems; the photovoltaic panels, wind turbines and methanol hydrogen production power generation systems are all connected to the external power grid; the photovoltaic panels, wind turbines, energy storage batteries, battery management systems and methanol hydrogen production power generation systems are all connected to the energy storage batteries; the battery management systems, methanol hydrogen production power generation systems and air-energy hot water circulation systems are all connected to the energy management system; The photovoltaic panels and wind turbines are both used to generate electrical energy and send the generated electrical energy to the energy storage battery and the external power grid; The energy storage battery is used to store electrical energy and send electrical energy to the external power grid; The battery management system is used to collect the power of the energy storage battery in real time and send the power to the energy management system; The energy management system is used to regulate the methanol-to-hydrogen power generation system to perform supplementary power generation based on the power quantity.

6. The microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity according to claim 5 is characterized in that: The methanol-to-hydrogen power generation system includes: a solution storage tank, a heat exchanger, a reforming chamber, a solid oxide fuel cell and a regulating valve; the air-to-hot water circulation system includes: an air-to-heat pump, a temperature sensor and a hydrogen combustion chamber; The solution storage tank is connected to the reforming chamber via the heat exchanger, the reforming chamber is connected to the solid oxide fuel cell and the hydrogen combustion chamber respectively via the regulating valve, the hydrogen combustion chamber is connected to the air-energy heat pump via a pipeline, and the temperature sensor is provided on the air-energy heat pump; the temperature sensor and the regulating valve are both connected to the energy management system; the solid oxide fuel cell is connected to an external power grid; The solution storage tank stores a methanol / water solution with a set water-to-alcohol ratio; The heat exchanger performs heat exchange on the methanol / water solution stored and transported by the solution storage tank and then transports the solution into the reforming chamber; The reforming chamber is used to process the methanol / water solution to obtain hydrogen-rich gas; The temperature sensor is used to collect the temperature of water after circulating through the air energy heat pump; The energy management system is further configured to adjust the ratio of the hydrogen-rich gas entering the solid oxide fuel cell and the hydrogen combustion chamber through the regulating valve based on the temperature of the water circulated through the air energy heat pump; The solid oxide fuel cell is used to generate electrical energy using the hydrogen-rich gas; The hydrogen combustion chamber is used to burn the hydrogen-rich gas to generate high-temperature combustion gas and heat the water in the pipeline.

7. The microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity according to claim 5 is characterized in that: The microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity also includes: a bidirectional DC / DC converter and an AC / DC converter; The photovoltaic panel is connected to the energy storage battery via the bidirectional DC / DC converter; The wind turbine is connected to the energy storage battery through the AC / DC converter.

8. The microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity according to claim 7 is characterized in that: The microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity also includes: a photovoltaic controller and a wind turbine controller; The photovoltaic controller is used to control the photovoltaic panel to generate electrical energy and send the generated electrical energy to the energy storage battery and the external power grid; The wind turbine controller is used to control the wind turbine to generate electrical energy and send the generated electrical energy to the energy storage battery and the external power grid.

9. The microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity according to claim 6 is characterized in that: The methanol-to-hydrogen power generation system further includes: a unidirectional DC / DC converter; The solid oxide fuel cell is connected to an external power grid through the unidirectional DC / DC converter.

10. The microgrid system based on wind, solar, alcohol storage and hydrogen multi-energy complementarity according to claim 6 is characterized in that: The air-energy hot water circulation system further comprises: a water reservoir; the water reservoir is connected to the hydrogen combustion chamber and the air-energy heat pump respectively; The water reservoir is used to store water and provide water for the air energy heat pump.

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