Control method of electricity-heat-hydrogen-iron poly-generation system driven by renewable energy sources

Abstract

The invention discloses a control method of an electricity-heat-hydrogen-iron poly-generation system driven by renewable energy sources, the poly-generation system is composed of renewable energy source power generation equipment, water electrolysis hydrogen production equipment, storage battery equipment and metallurgical equipment, the control method is divided into two parts: calculation of a design value and a real-time value, the design values of the hydrogen production amount, the reducing gas temperature and the reducing gas proportion are obtained through the characteristic curve of renewable energy sources such as wind and light, the characteristics of an electrolytic bath and the metallurgical amount of metallurgical equipment; in the real-time value calculation process, regulation and control means such as reducing gas proportion regulation, reducing gas temperature and reducing gas proportion regulation and storage battery mode switching are sequentially carried out through the generating capacity fluctuation value, and the real-time values of the hydrogen production capacity, the reducing gas temperature and the reducing gas proportion are obtained. According to the method, the impact of renewable energy fluctuation on the poly-generation system is relieved through the modes of hierarchical calculation of a design value and a real-time value, combined regulation and control of the reducing gas and the storage battery and the like, and stable, safe and low-carbon operation of the poly-generation system is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of renewable energy utilization and control, and in particular relates to a control method for an electricity-heat-hydrogen-iron polygeneration system driven by renewable energy. Background Art

[0002] The intermittent nature of renewable energy causes fluctuations in power generation and hydrogen production, while metallurgical volume is generally stable. How to use fluctuating "green hydrogen" to reduce stable "iron ore" has become a key technical bottleneck restricting the safe and stable operation of the electricity-heat-hydrogen-iron cogeneration system. Summary of the invention

[0003] The present invention aims to solve the problem that the fluctuation of "green electricity" in the electricity-heat-hydrogen-iron polygeneration system makes it difficult for the system to operate stably, and starts from the total amount and temperature requirements of the reducing gas of the metallurgical system, and aims to propose a control method that satisfies the stable operation of the electricity-heat-hydrogen-iron polygeneration system. The purpose of the present invention is to provide a control method for an electricity-heat-hydrogen-iron polygeneration system driven by renewable energy, which can smooth the impact of the fluctuation of renewable energy on the safe operation of the system by adjusting the reducing gas temperature and ratio, switching the battery mode, etc., to ensure the stable operation of the polygeneration system, and provide technical guidance for the large-scale consumption of renewable energy and low-carbon emissions in the metallurgical industry.

[0004] The technical solution adopted by the present invention to solve the technical problem is:

[0005] A control method for a renewable energy-driven electricity-heat-hydrogen-iron cogeneration system, the cogeneration system comprising renewable energy power generation equipment, water electrolysis hydrogen production equipment, battery equipment and metallurgical equipment; the control method for the cogeneration system is divided into two parts: design value calculation and real-time value calculation; in the design value calculation process, a predicted value of the power generation of the renewable energy power generation equipment is obtained according to the wind and light characteristics, a design value of the hydrogen production amount is obtained according to the predicted value of the power generation of the renewable energy power generation equipment based on the characteristics of the electrolyzer in the water electrolysis hydrogen production equipment, a plurality of groups of hydrogen amounts, reducing gas proportions and reducing gas temperatures are obtained through heat balance and material balance according to the metallurgical amount of the metallurgical equipment, and a design value of the reducing gas temperature and a design value of the reducing gas proportion are determined according to the design value of the hydrogen production amount; in the real-time value calculation process, a change between the predicted value and the real-time value of the power generation of the renewable energy power generation equipment is calculated, which is called the fluctuation value of the power generation amount, and the real-time value of the reducing gas proportion, the real-time value of the reducing gas temperature, the real-time value of the hydrogen production amount and the operating status of the battery are obtained after a speed limit link and an amplitude limit link, so as to complete the stable and safe operation of the cogeneration system.

[0006] Furthermore, the connection between the various devices in the polygeneration system is as follows: the power generated by the renewable energy power generation equipment is sent to the water electrolysis hydrogen production equipment to produce hydrogen, and the hydrogen replaces part of the carbon monoxide as a reducing gas and is sent to the metallurgical equipment, where it is mixed with carbon monoxide and heated to form a high-temperature reducing gas to reduce the iron ore to produce molten iron; when the battery device is in charging mode, it is connected to the renewable energy power generation equipment; when the battery device is in discharging mode, it is connected to the water electrolysis hydrogen production equipment.

[0007] Furthermore, the design value of the hydrogen production is

[0008] G s =g(P s )

[0009] Where: G s is the design value of hydrogen production capacity of water electrolysis hydrogen production equipment, kg / s; P s is the predicted value of the power generation of renewable energy power generation equipment, kW; g(P s ) is a fitting formula for the relationship between the amount of electricity and the amount of hydrogen produced, which is determined by the characteristics of the electrolyzer in the water electrolysis hydrogen production equipment.

[0010] Furthermore, the reducing gas is composed of carbon monoxide and hydrogen produced in a water electrolysis hydrogen production device, and the reducing gas ratio is the proportion of hydrogen in the reducing gas.

[0011] Furthermore, the multiple groups of hydrogen amounts, reducing gas ratios, and reducing gas temperatures obtained through heat balance and material balance according to the metallurgical amount of the metallurgical equipment are as follows:

[0012]

[0013] Wherein, L is a combination of multiple groups of hydrogen volume, reducing gas ratio, and reducing gas temperature; L i (T i ) is the reducing gas temperature T i The combination of hydrogen volume, reducing gas ratio and reducing gas temperature at the time of T min is the minimum temperature of reducing gas in metallurgical equipment; T max G is the maximum temperature of reducing gas in metallurgical equipment; i When the reducing gas temperature is T i Hydrogen volume range at 10000 ℃; G i,min When the reducing gas temperature is T i The minimum amount of hydrogen when G i,max When the reducing gas temperature is T i The maximum amount of hydrogen at R i When the reducing gas temperature is T i , the amount of hydrogen is G i Reducing gas ratio range; R i,min When the reducing gas temperature is Ti , the amount of hydrogen is G i The minimum value of the reducing gas ratio when R i,max When the reducing gas temperature is T i , the amount of hydrogen is G i The maximum value of the reducing gas ratio.

[0014] Furthermore, the design value of the reducing gas temperature and the design value of the reducing gas ratio are calculated as follows:

[0015] The required hydrogen range at multiple reducing gas temperatures is obtained according to the combination L of multiple hydrogen amounts, reducing gas ratios, and reducing gas temperatures. Take the midpoint of the hydrogen range The design value G closest to the hydrogen production s The reducing gas temperature T i As the design value of reducing gas temperature T s , the reducing gas ratio R at this time i It is called the design value of the reducing gas ratio R s ;

[0016]

[0017] In the formula, When the reducing gas temperature is T i The minimum amount of hydrogen at 100 ℃; When the reducing gas temperature is T i The maximum amount of hydrogen at .

[0018] Furthermore, the calculation method of the fluctuation value of the power generation is as follows:

[0019] ΔP=P rt -P s

[0020] Where: ΔP is the fluctuation value of power generation, kW; P rt It is the real-time value of the power generation of renewable energy power generation equipment, kW.

[0021] Furthermore, the speed limiting link functions as follows:

[0022] 1) Speed ​​limit link 1: |ΔP|≤P 1

[0023] The design value of the reducing gas temperature T s Under the condition that the reduction gas utilization rate is greater than 45%, the maximum and minimum values ​​of the reduction gas ratio are obtained. When the hydrogen change caused by the fluctuation value of the power generation reaches the maximum or minimum value of the reduction gas ratio, the fluctuation value of the power generation at this time is recorded as P 1 ;

[0024] When the fluctuation value of power generation ΔP is less than or equal to P 1 When adjusting the reducing gas ratio, the real-time value of the reducing gas ratio is as follows:

[0025] R rt =R s +K p1 ΔP

[0026] Where: R rt is the real-time value of the reducing gas ratio; R s is the design value of the reducing gas ratio, K p1 In order to adjust the ratio of reducing gas to the change caused by the fluctuation of power generation, a proportional controller can be selected.

[0027] 2) Speed ​​limit link 2: P 1 <|ΔP|≤P 2

[0028] At the maximum and minimum temperatures of the reducing gas temperature, with the reducing gas utilization rate greater than 45%, the maximum and minimum values ​​of the reducing gas ratio are obtained. When the hydrogen change caused by the fluctuation value of the power generation reaches the maximum or minimum value of the reducing gas ratio, the fluctuation value of the power generation at this time is recorded as P 2 ;

[0029] When the fluctuation value of power generation ΔP is greater than P 1 and less than or equal to P 2 , adjust the reducing gas temperature and ratio, the real-time values ​​of the reducing gas temperature and ratio are as follows:

[0030] T rt =T s +K p2 ΔP

[0031] R rt =R s +K p1 ΔP

[0032] Where: T rt is the real-time value of the reducing gas temperature; T s is the design value of reducing gas temperature, K p2 In order to adjust the temperature of the reducing gas according to the fluctuation of power generation, a proportional controller can be selected.

[0033] Furthermore, the working process of the limiting link is as follows:

[0034] When the fluctuation value of power generation is greater than P 2 When the fluctuation value of power generation is less than -P 2 When the battery is in discharge mode, part of the electricity in the battery is sent to the water electrolysis hydrogen production equipment;

[0035] The battery charge or discharge capacity is calculated as follows:

[0036] ΔP x =P rt -P 2

[0037] Where: ΔP x is the charge or discharge capacity of the battery, kW.

[0038] Furthermore, the calculation of the real-time value of hydrogen production is as follows:

[0039]

[0040] Where: is the real-time value of hydrogen production, kg / s; ΔP x is the charge or discharge capacity of the battery, kW; g(P rt ) is the fitting formula for the relationship between the real-time value of the power generation of renewable energy power generation equipment and the real-time value of hydrogen production; g(P rt +ΔP x ) is the fitting formula for the relationship between the real-time value of the input power of the electrolyzer in the water electrolysis hydrogen production equipment and the real-time value of the hydrogen production.

[0041] Compared with the prior art, the advantages of the present invention are as follows:

[0042] (1) In view of the intermittent characteristics of renewable energy power generation equipment, a hierarchical calculation method based on the design value based on the predicted value of renewable energy power generation and the real-time value based on the power generation fluctuation value is proposed, which takes into account the rapidity and accuracy of system regulation.

[0043] (2) A multi-level control method based on the speed and amplitude limit link, such as "reducing gas ratio adjustment", "reducing gas temperature and ratio adjustment", and "battery mode switching", is proposed to achieve safe and stable operation of the polygeneration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 The control method flow chart of the polygeneration system.

[0045] Figure 2 Schematic diagram of a power-heat-hydrogen-iron polygeneration system driven by renewable energy. DETAILED DESCRIPTION

[0046] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0047] A control method for a renewable energy-driven electricity-heat-hydrogen-iron polygeneration system, such as Figure 2As shown in Figure 1, the polygeneration system includes renewable energy power generation equipment, water electrolysis hydrogen production equipment, battery equipment and metallurgical equipment; Figure 1 As shown, the control method of the multi-generation system is divided into two parts: design value calculation and real-time value calculation; in the design value calculation process, the predicted value of the power generation of the renewable energy power generation equipment is obtained according to the wind and light characteristics, the design value of the hydrogen production is obtained according to the predicted value of the power generation of the renewable energy power generation equipment based on the characteristics of the electrolyzer in the water electrolysis hydrogen production equipment, and according to the metallurgical amount of the metallurgical equipment, multiple groups of hydrogen quantity, reducing gas ratio, and reducing gas temperature are obtained through heat balance and material balance, and the design value of the reducing gas temperature and the design value of the reducing gas ratio are determined according to the design value of the hydrogen production; in the real-time value calculation process, the change between the predicted value and the real-time value of the power generation of the renewable energy power generation equipment is calculated, which is called the fluctuation value of the power generation, and the real-time value of the reducing gas ratio, the real-time value of the reducing gas temperature, the real-time value of the hydrogen production and the operating status of the battery are obtained after the speed limit link and the amplitude limit link, so as to complete the stable and safe operation of the multi-generation system.

[0048] like Figure 2 As shown, the connection between the various devices in the polygeneration system is as follows: the power generated by the renewable energy power generation device is sent to the water electrolysis hydrogen production device to produce hydrogen, and the hydrogen replaces part of the carbon monoxide as a reducing gas and is sent to the metallurgical equipment, where it is mixed with carbon monoxide and heated to form a high-temperature reducing gas to reduce the iron ore to produce molten iron; when the battery device is in the charging mode, it is connected to the renewable energy power generation device to store the power generated by the renewable energy power generation device in the battery device; when the battery device is in the discharging mode, it is connected to the water electrolysis hydrogen production device to supply power to the water electrolysis hydrogen production device.

[0049] The design value of hydrogen production is

[0050] G s =g(P s )

[0051] Where: G s is the design value of hydrogen production capacity of water electrolysis hydrogen production equipment, kg / s; P s is the predicted value of the power generation of renewable energy power generation equipment, kW; g(P s ) is a fitting formula for the relationship between the amount of electricity and the amount of hydrogen produced, which is determined by the characteristics of the electrolyzer in the water electrolysis hydrogen production equipment.

[0052] The reducing gas is composed of carbon monoxide and hydrogen produced in a water electrolysis hydrogen production device, and the reducing gas ratio is the proportion of hydrogen in the reducing gas.

[0053] The multiple groups of hydrogen quantity, reducing gas ratio, and reducing gas temperature obtained through heat balance and material balance according to the metallurgical quantity of the metallurgical equipment are as follows:

[0054]

[0055] Wherein, L is a combination of multiple groups of hydrogen volume, reducing gas ratio, and reducing gas temperature; L i (T i ) is the reducing gas temperature T i The combination of hydrogen volume, reducing gas ratio and reducing gas temperature at the time of T min is the minimum temperature of reducing gas in metallurgical equipment; T max is the maximum temperature of reducing gas in metallurgical equipment; G i When the reducing gas temperature is T i Hydrogen volume range at 10000 ℃; G i,min When the reducing gas temperature is T i The minimum amount of hydrogen when G i,max When the reducing gas temperature is T i The maximum amount of hydrogen when R i When the reducing gas temperature is T i , the amount of hydrogen is G i Reducing gas ratio range: R i,min When the reducing gas temperature is T i , the amount of hydrogen is G i The minimum value of the reducing gas ratio when R i,max When the reducing gas temperature is T i , the amount of hydrogen is G i The maximum value of the reducing gas ratio.

[0056] The calculation method of the design value of the reducing gas temperature and the design value of the reducing gas ratio is as follows:

[0057] The required hydrogen range at multiple reducing gas temperatures is obtained according to the combination L of multiple hydrogen amounts, reducing gas ratios, and reducing gas temperatures. Take the midpoint of the hydrogen range The design value G closest to the hydrogen production s The reducing gas temperature T i As the design value of reducing gas temperature T s , the reducing gas ratio R at this time i It is called the design value of the reducing gas ratio R s .

[0058]

[0059] In the formula, When the reducing gas temperature is T i The minimum amount of hydrogen at 100 ℃; When the reducing gas temperature is T i The maximum amount of hydrogen at .

[0060] The calculation method of the fluctuation value of the power generation is as follows:

[0061] ΔP=P rt -P s

[0062] Where: ΔP is the fluctuation value of power generation, kW; P rt It is the real-time value of the power generation of renewable energy power generation equipment, kW.

[0063] The speed limiting link functions as follows:

[0064] 1) Speed ​​limit link 1: |ΔP|≤P 1

[0065] The design value of the reducing gas temperature T s Under the condition that the reduction gas utilization rate is greater than 45%, the maximum and minimum values ​​of the reduction gas ratio are obtained. When the hydrogen change caused by the fluctuation value of the power generation reaches the maximum or minimum value of the reduction gas ratio, the fluctuation value of the power generation at this time is recorded as P 1 ;

[0066] When the fluctuation value of power generation ΔP is less than or equal to P 1 When adjusting the reducing gas ratio, the real-time value of the reducing gas ratio is as follows:

[0067] R rt =R s +K p1 ΔP

[0068] Where: R rt is the real-time value of the reducing gas ratio; R s is the design value of the reducing gas ratio, K p1 In order to adjust the ratio of reducing gas to the change caused by the fluctuation of power generation, a proportional controller can be selected.

[0069] 2) Speed ​​limit link 2: P 1 <|ΔP|≤P 2

[0070] At the maximum and minimum temperatures of the reducing gas temperature, with the reducing gas utilization rate greater than 45%, the maximum and minimum values ​​of the reducing gas ratio are obtained. When the hydrogen change caused by the fluctuation value of the power generation reaches the maximum or minimum value of the reducing gas ratio, the fluctuation value of the power generation at this time is recorded as P 2 ;

[0071] When the fluctuation value of power generation ΔP is greater than P 1 and less than or equal to P 2 When the reducing gas temperature and ratio are adjusted, the real-time values ​​of the reducing gas temperature and ratio are as follows:

[0072] T rt =T s +K p2 ΔP

[0073] R rt =R s +K p1 ΔP

[0074] Where: T rt is the real-time value of the reducing gas temperature; T s is the design value of reducing gas temperature, K p2 In order to adjust the temperature of the reducing gas according to the fluctuation of power generation, a proportional controller can be selected.

[0075] The working process of the limiting link is as follows:

[0076] When the fluctuation value of power generation is greater than P 2 When the fluctuation value of power generation is less than -P 2 When the battery is in discharge mode, part of the electricity in the battery is sent to the water electrolysis hydrogen production equipment.

[0077] The battery charge or discharge capacity is calculated as follows:

[0078] ΔP x =P rt -P 2

[0079] Where: ΔP x is the charge or discharge capacity of the battery, kW.

[0080] The calculation of the real-time value of hydrogen production is as follows:

[0081]

[0082] Where: G H2,rt is the real-time value of hydrogen production, kg / s; ΔP x is the charge or discharge capacity of the battery, kW; g(P rt ) is the fitting formula for the relationship between the real-time value of the power generation of renewable energy power generation equipment and the real-time value of hydrogen production; g(P rt +ΔP x ) is the fitting formula for the relationship between the real-time value of the input power of the electrolyzer in the water electrolysis hydrogen production equipment and the real-time value of the hydrogen production.

[0083] The present invention alleviates the impact of renewable energy fluctuations on the polygeneration system through hierarchical calculation of design values ​​and real-time values, and joint regulation of reducing gas and batteries, thereby achieving stable, safe and low-carbon operation of the polygeneration system.

Claims

1. A control method for a renewable energy-driven electricity-heat-hydrogen-iron polygeneration system, characterized in that: The polygeneration system includes renewable energy power generation equipment, water electrolysis hydrogen production equipment, battery equipment and metallurgical equipment; The control method of the multi-generation system is divided into two parts: design value calculation and real-time value calculation; in the design value calculation process, the predicted value of the power generation of the renewable energy power generation equipment is obtained according to the wind and light characteristics, and the design value of the hydrogen production is obtained according to the predicted value of the power generation of the renewable energy power generation equipment based on the characteristics of the electrolyzer in the water electrolysis hydrogen production equipment. According to the metallurgical amount of the metallurgical equipment, multiple groups of hydrogen quantity, reducing gas ratio, and reducing gas temperature are obtained through heat balance and material balance, and the design value of the reducing gas temperature and the design value of the reducing gas ratio are determined according to the design value of the hydrogen production; in the real-time value calculation process, the change between the predicted value and the real-time value of the power generation of the renewable energy power generation equipment is calculated, which is called the fluctuation value of the power generation, and the real-time value of the reducing gas ratio, the real-time value of the reducing gas temperature, the real-time value of the hydrogen production and the operating status of the battery are obtained after the speed limit link and the amplitude limit link, so as to complete the stable and safe operation of the multi-generation system.

2. The control method of a renewable energy driven electricity-heat-hydrogen-iron polygeneration system according to claim 1, characterized in that: The connection between the various devices in the polygeneration system is as follows: the power generated by the renewable energy power generation device is sent to the water electrolysis hydrogen production device to produce hydrogen, and the hydrogen replaces part of the carbon monoxide and is sent to the metallurgical equipment as a reducing gas, and is mixed with carbon monoxide and heated to form a high-temperature reducing gas to reduce the iron ore to produce molten iron; when the battery device is in charging mode, it is connected to the renewable energy power generation device; when the battery device is in discharging mode, it is connected to the water electrolysis hydrogen production device.

3. The control method of a renewable energy driven electricity-heat-hydrogen-iron polygeneration system according to claim 1, characterized in that: The design value of hydrogen production is G s =g(P s ) Where: G s is the design value of hydrogen production capacity of water electrolysis hydrogen production equipment, kg / s; P s is the predicted value of the power generation of renewable energy power generation equipment, kW; g(P s ) is a fitting formula for the relationship between the amount of electricity and the amount of hydrogen produced, which is determined by the characteristics of the electrolyzer in the water electrolysis hydrogen production equipment.

4. The control method of a renewable energy driven electricity-heat-hydrogen-iron polygeneration system according to claim 1, characterized in that: The reducing gas is composed of carbon monoxide and hydrogen produced in a water electrolysis hydrogen production device.

5. The control method of a renewable energy driven electricity-heat-hydrogen-iron polygeneration system according to claim 1, characterized in that: The reducing gas ratio refers to the proportion of hydrogen in the reducing gas.

6. The control method of a renewable energy driven electricity-heat-hydrogen-iron polygeneration system according to claim 1, characterized in that: The multiple groups of hydrogen quantity, reducing gas ratio, and reducing gas temperature obtained through heat balance and material balance according to the metallurgical quantity of the metallurgical equipment are as follows: Wherein, L is a combination of multiple groups of hydrogen volume, reducing gas ratio, and reducing gas temperature; L i (T i ) is the reducing gas temperature T i The combination of hydrogen volume, reducing gas ratio and reducing gas temperature at the time of T min It is the minimum temperature of reducing gas in metallurgical equipment; T max G is the maximum temperature of reducing gas in metallurgical equipment; i When the reducing gas temperature is T i Hydrogen volume range at 10000 ℃; G i,min When the reducing gas temperature is T i The minimum amount of hydrogen when G i,max When the reducing gas temperature is T i The maximum amount of hydrogen at R i When the reducing gas temperature is T i , the amount of hydrogen is G i Reducing gas ratio range; R i,min When the reducing gas temperature is T i , the amount of hydrogen is G i The minimum value of the reducing gas ratio when R i,max When the reducing gas temperature is T i , the amount of hydrogen is G i The maximum value of the reducing gas ratio.

7. The control method of a renewable energy driven electricity-heat-hydrogen-iron polygeneration system according to claim 1, characterized in that: The calculation method of the design value of the reducing gas temperature and the design value of the reducing gas ratio is as follows: The required hydrogen range at multiple reducing gas temperatures is obtained according to the combination L of multiple hydrogen amounts, reducing gas ratios, and reducing gas temperatures. Take the midpoint of the hydrogen range The design value G closest to the hydrogen production s The reducing gas temperature T i As the design value of reducing gas temperature T s , the reducing gas ratio R at this time i It is called the design value of the reducing gas ratio R s ; In the formula, When the reducing gas temperature is T i The minimum amount of hydrogen at 100 ℃; When the reducing gas temperature is T i The maximum amount of hydrogen at .

8. The control method of a renewable energy driven electricity-heat-hydrogen-iron polygeneration system according to claim 1, characterized in that: The calculation method of the fluctuation value of the power generation is as follows: ΔP=P rt -P s Where: ΔP is the fluctuation value of power generation, kW; P rt is the real-time value of the power generation of renewable energy power generation equipment, kW; P s is the predicted value of power generation of renewable energy power generation equipment, kW.

9. The control method of a renewable energy driven electricity-heat-hydrogen-iron polygeneration system according to claim 1, characterized in that: The speed limiting link functions as follows: 1) Speed ​​limit link 1: ΔP≤P1 The design value of the reducing gas temperature T s Under the condition that the reduction gas utilization rate is greater than 45%, the maximum and minimum values ​​of the reduction gas ratio are obtained. When the hydrogen change caused by the fluctuation value of the power generation reaches the maximum or minimum value of the reduction gas ratio, the fluctuation value of the power generation at this time is recorded as P1; When the fluctuation value ΔP of power generation is less than or equal to P1, the reduction gas ratio is adjusted, and the real-time value of the reduction gas ratio is as follows: R rt =R s +K p1 ·ΔP Where: R rt is the real-time value of the reducing gas ratio; R s is the design value of the reducing gas ratio, K p1 A proportional controller is selected based on the relationship between the change in the reduction gas ratio caused by the fluctuation in power generation; 2) Speed ​​limit link 2: P1<ΔP≤P2 At the maximum and minimum temperatures of the reducing gas temperature, with the reducing gas utilization rate being greater than 45%, the maximum and minimum values ​​of the reducing gas ratio are obtained. When the hydrogen change caused by the fluctuation value of the power generation reaches the maximum or minimum value of the reducing gas ratio, the fluctuation value of the power generation at this time is recorded as P2; When the fluctuation value ΔP of power generation is greater than P1 and less than or equal to P2, the temperature and proportion of reducing gas are adjusted. The real-time values ​​of the temperature and proportion of reducing gas are as follows: T rt =T s +K p2 ·ΔP R rt =R s +K p1 ·ΔP Where: T rt is the real-time value of the reducing gas temperature; T s is the design value of reducing gas temperature, K p2 In order to use the relationship between the temperature change of the reducing gas caused by the fluctuation of power generation, a proportional controller is selected; The working process of the limiting link is as follows: When the fluctuation value of power generation is greater than P2, the battery is in charging mode, and the power in the renewable energy power generation equipment is sent to the battery; when the fluctuation value of power generation is less than -P2, the battery is in discharging mode, and part of the power in the battery is sent to the water electrolysis hydrogen production equipment; The battery charge or discharge capacity is calculated as follows: ΔP x =P rt -P2 Where: ΔP x is the charge or discharge capacity of the battery, kW.

10. The control method of a renewable energy driven electricity-heat-hydrogen-iron polygeneration system according to claim 1, characterized in that: The calculation of the real-time value of hydrogen production is as follows: Where: is the real-time value of hydrogen production, kg / s; ΔP x is the charge or discharge capacity of the battery, kW; g(P rt ) is the fitting formula for the relationship between the real-time value of the power generation of renewable energy power generation equipment and the real-time value of hydrogen production; g(P rt +ΔP x ) is the fitting formula for the relationship between the real-time value of the input power of the electrolyzer in the water electrolysis hydrogen production equipment and the real-time value of the hydrogen production.

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