Wind-solar complementary hydrogen production system and method based on alkaline electrolytic water hydrogen production

Abstract

The invention discloses a wind-solar complementary hydrogen production system and method based on alkaline electrolytic water hydrogen production. The system comprises a photovoltaic power generation unit, a wind power generation unit, a storage battery energy storage unit, an electrolytic hydrogen production unit, a load and a power electronic converter. The photovoltaic power generation unit is electrically connected with the alternating current bus through an AC / DC converter, the wind power generation unit is electrically connected with the alternating current bus through an AC / AC converter, and the alternating current bus is connected with a superior power distribution network through a transformer; the storage battery energy storage unit is electrically connected with the alternating current bus through the AC / DC converter, the load is electrically connected with the alternating current bus through the AC / AC converter, and the electrolytic hydrogen production unit comprises an electrolytic bath, a compressor and a hydrogen storage tank; the problem that a single AEL technology or a PEMEL technology cannot give consideration to response speed and cost is solved, composite hydrogen production is achieved based on the constructed wind-solar complementary hydrogen production system, flexible absorption of wind-solar resources is achieved, and the hydrogen production cost of the system is reduced on the basis of improving the hydrogen production amount of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production by electrolysis, and in particular to a wind-solar complementary hydrogen production system and method based on hydrogen production by alkaline water electrolysis. Background Art

[0002] At present, the carbon emission problem in the energy industry is becoming increasingly prominent with the extensive use of fossil energy. The use of water electrolysis hydrogen production technology can effectively realize the efficient conversion and flexible consumption of renewable energy. In the water electrolysis hydrogen production technology, alkaline electrolyzer AEL and proton exchange membrane electrolyzer PEMEL have been widely used in the engineering field. AEL water electrolysis technology has the advantages of simple operation and low cost, but AEL has a long start-up time under rated load and a slow response speed to load, and it is difficult to adapt to the highly volatile wind and solar output conditions. PEMEL uses proton exchange membrane to conduct protons, starts quickly under rated load, has the advantages of fast response and high energy efficiency, and PEMEL can adapt to rapidly changing renewable energy power input and has a high hydrogen production efficiency. However, PEMEL has the problem of excessively high equipment cost. Therefore, it is necessary to design a wind-solar complementary hydrogen production system and method based on alkaline water electrolysis hydrogen production to solve the above problems. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a wind-solar complementary hydrogen production system and method based on alkaline water electrolysis to solve the problem that single AEL technology or PEMEL technology cannot take into account both response speed and cost. Based on the constructed wind-solar complementary hydrogen production system, composite hydrogen production is realized, and flexible consumption of wind and solar resources is achieved, thereby reducing the system hydrogen production cost on the basis of increasing the system hydrogen production capacity.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: The wind-solar complementary hydrogen production system based on alkaline water electrolysis hydrogen production includes a photovoltaic power generation unit, a wind power generation unit, a battery energy storage unit, an electrolytic hydrogen production unit, a load and a power electronic converter; the power electronic converter includes an AC / DC converter and an AC / AC converter; the photovoltaic power generation unit is electrically connected to the AC bus through the AC / DC converter, the wind power generation unit is electrically connected to the AC bus through the AC / AC converter, and the AC bus is connected to the upper-level distribution network through a transformer; the battery energy storage unit is electrically connected to the AC bus through the AC / DC converter, and the load is electrically connected to the AC bus through the AC / AC converter. The electrolytic hydrogen production unit includes an electrolyzer, a compressor and a hydrogen storage tank, the electrolyzer is electrically connected to the AC bus through the AC / DC converter, and the compressor is electrically connected to the AC bus through the AC / AC converter.

[0005] Preferably, the method for wind-solar complementary hydrogen production based on alkaline water electrolysis comprises the following steps: S1, build a composite electrolyzer evaluation model and calculate the optimal model, including: S101, construct the evaluation model; S102, constructing an ANP judgment matrix; S103, consistency test of judgment matrix; S104, constructing an ANP supermatrix; S105, stabilization of the ANP weighted supermatrix; S106, calculate the optimal model: By assigning values ​​to the judgment matrix respectively, we can finally get 4 sets of stable weight data. The weight average of the 4 sets of data is calculated using the arithmetic average method to get the final indicators and solution weights.

[0006] S2, mathematical modeling of wind-solar hybrid hydrogen production system; S3, calculate and compare the results based on the mathematical modeling of the wind-solar hybrid hydrogen production system.

[0007] Preferably, in step S101, in the evaluation model, the control layer is the most preferred type of composite electrolyzer, and the network layer is divided into two clusters: a scheme cluster and an indicator cluster; A total of seven related indicators were extracted to form the indicator cluster U1, including rated current density u11, hydrogen production u12, hot start time u13, dynamic response time u14, electrolyzer life u15, component aging rate u16, and equipment cost u17; four candidate schemes were determined by expert experience method to form the scheme cluster U2, including AEL and PEMEL capacity ratio of 1:1u21, AEL and PEMEL capacity ratio of 1.5:1u22, AEL and PEMEL capacity ratio of 2:1u23, and AEL and PEMEL capacity ratio of 2.5:1u24; AEL represents alkaline electrolyzer, and PEMEL represents proton exchange membrane electrolyzer; The expert survey method is used to determine whether the indicators are independent, whether there is an interaction relationship, and whether there is a feedback relationship between the various schemes and the indicators. Finally, it is determined that all indicators in the system have an interactive relationship, and each scheme has a feedback relationship with each indicator. The schemes are independent of each other and have no mutual influence.

[0008] Preferably, in step S102, three types of judgment matrices are generated: the first type is the influence between the indicators, that is, the importance of each indicator relative to other indicators, and a total of seven judgment matrices can be generated; the second type is the influence of each indicator on each solution, that is, the importance of each solution relative to each indicator, and a total of seven judgment matrices can be generated; the third type is the influence of each solution on each indicator, that is, the importance of each indicator relative to each solution, and a total of four judgment matrices can be generated; the element values ​​in the judgment matrix adopt Satty's 9-level scaling method.

[0009] Preferably, in step S103, the random consistency ratio ξ of the judgment matrix is ​​calculated CR : If CR <0.1, then the consistency of the judgment matrix is ​​considered to meet the conditions; if ξ CR ≥0.1, then adjust the value size in the judgment matrix until ξ is satisfied CR So far, CR The calculation formula is: ; In the formula, is the consistency index of the judgment matrix; is the average random consistency index of the judgment matrix, λ max is the maximum eigenvalue of the judgment matrix; n is the order of the judgment matrix.

[0010] Preferably, in step S104, the method for constructing the ANP supermatrix is: Suppose cluster U in the network layer i The element in (i=1, 2, ..., N) is u i1 、u i2 、…、u in , U j The element in (j=1, 2, ..., N) is u j1 、u j2 、…、u jn ; Will U i and U j The elements in the matrix are compared with each other to obtain the judgment matrix. If the judgment matrix satisfies the consistency test, the weight column vector [w i1，jk , w i2，jk ,…,w in，jk ] T (k=1, 2, …, n; Writing it in matrix form, we can get the weight vector matrix W ij for: ; W ij The column vector of is U i Element u i1 、u i2 、…、u in ; for U j Element u j1 、u j2 、…、u jn The importance weight vector of j The elements are not affected by U i The elements in the ij=0, and then we can get the supermatrix W; since there are only 2 clusters in the network layer, that is, N=2, the supermatrix W is: ; Each element in the supermatrix is ​​a matrix, but W is not a normalized matrix; in order to facilitate calculation, the supermatrix columns are normalized, that is, the elements of the supermatrix W are weighted to obtain the weighted supermatrix , where the elements , is the weighting factor.

[0011] Preferably, in step S105, the method for stabilizing the ANP weighted supermatrix is: Weighted Supermatrix Perform stabilization processing and calculate the limiting value of the following formula: ; If this limit converges and is unique, the column vectors in the matrix are the stable weights of each evaluation index.

[0012] Preferably, the mathematical modeling of the wind-solar complementary hydrogen production system includes wind-solar power generation model modeling, water electrolysis hydrogen production model modeling, hydrogen storage model modeling and hydrogen production cost calculation; The wind and solar power generation model includes wind power generation model and photovoltaic power generation model: Calculate the fan output power P wt : ; In the formula, is the output mechanical torque of the wind turbine; is the angular velocity of the wind turbine; is the air density; R0 is the radius of the wind turbine impeller; v is the real-time wind speed; C p is the efficiency value, which is related to the tip speed ratio and the pitch angle; The photovoltaic power generation power PPV is as follows: ; In the formula, C1 and C2 are the volt-ampere characteristic adjustment coefficients; Im is the maximum current; V m is the maximum voltage; I sc is the short-circuit current; V oc is the open circuit voltage; V PV Output voltage for photovoltaic power generation equipment.

[0013] Preferably, the water electrolysis hydrogen production model is: The electrolytic cells in the system include AEL and PEMEL. At any temperature, the UI equation of AEL is: ; Where r1 and r2 are the ohmic resistance parameters of the electrolyte; Urev is the reversible voltage; T el is the electrolytic cell temperature; A cell is the electrolysis module area; I el is the DC current; s1, s2, s3, t1, t2, t3 are the electrode overvoltage coefficients; The working characteristics of PEMEL water electrolysis hydrogen production are expressed by the relationship between voltage and current density. The total electrolysis voltage V pem By the open circuit voltage V ocv , activation overpotential V act , diffusion overpotential V diff and Ohmic overpotential V ohm The composition is shown in the following formula: ; ; Where R is the gas constant; T is the electrolysis temperature; z is the number of molar electrons involved in the electrolysis reaction; F is the Faraday constant; a H2 、a O2 、a H2O are the activities of hydrogen, oxygen, and water, respectively, and a H2O =1; Ta and Tc are the reaction temperatures of the anode and cathode respectively; α a and α c are the charge transfer coefficients of the anode and cathode, respectively; J is the current density; J 0，a and J 0，c are the exchange current densities of the anode and cathode respectively; C O2，m and C H2，m are the oxygen and hydrogen concentrations at the interface between the membrane and the porous electrode, respectively; C O2，mo and C H2，mo are the standard reference values ​​of oxygen and hydrogen concentrations at the interface between the membrane and the porous electrode, respectively; δm is the thickness of the membrane; σm is the resistivity of the membrane; the amount of hydrogen produced yH2 by AEL and PEMEL2 electrolyzers is shown in the following formula: ; In the formula, is the Faraday efficiency, M is the number of electrolytic cell units, and I is the electrolytic cell current.

[0014] Preferably, the hydrogen storage model is: the hydrogen storage module mainly uses a hydrogen storage tank to store hydrogen, and the net hydrogen storage rate of the hydrogen storage tank is: ; In the formula, is the net hydrogen storage rate of the hydrogen storage tank at time t; , They are the hydrogen inlet and outlet rates of the hydrogen storage tank at time t respectively; The cost of hydrogen production is calculated as: ; In the formula, C inv is the equipment investment coefficient; L is the full life cycle of the system; n H2 is the total hydrogen production during the entire life cycle of the system; C pur，i and C r，i They are the equipment purchase cost and operation and maintenance cost, including the equipment purchase cost and operation and maintenance cost of wind turbines, photovoltaic arrays, AEL and PEMEL.

[0015] The beneficial effects of a monitoring system data acquisition and processing method and system provided by the present invention are as follows: 1. The present invention designs a wind-solar complementary hydrogen production system based on wind power generation and photovoltaic power generation. The composite hydrogen production solves the problem that single AEL technology or PEMEL technology cannot take into account both response speed and cost. The constructed wind-solar complementary hydrogen production system realizes composite hydrogen production, realizes flexible consumption of wind and solar resources, and reduces the system hydrogen production cost on the basis of increasing the system hydrogen production capacity.

[0016] 2. Based on building an evaluation model and constructing an ANP judgment matrix, the present invention considers the seven indicators of two types of electrolyzers and the mutual influence between the indicators, proposes four candidate schemes for composite electrolyzers, and considers the feedback effect of each scheme on each indicator; finally, the optimal type of composite electrolyzer is obtained, and the effectiveness of this selection scheme is verified in the wind-solar complementary hydrogen production system, while optimizing the hydrogen production efficiency and economy of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the wind-solar complementary hydrogen production system architecture of the present invention. DETAILED DESCRIPTION

[0018] Embodiment 1: like Figure 1 As shown, the wind-solar complementary hydrogen production system based on alkaline water electrolysis hydrogen production includes a photovoltaic power generation unit, a wind power generation unit, a battery energy storage unit, an electrolytic hydrogen production unit, a load and a power electronic converter; the power electronic converter includes an AC / DC converter and an AC / AC converter; the photovoltaic power generation unit is electrically connected to the AC bus through the AC / DC converter, the wind power generation unit is electrically connected to the AC bus through the AC / AC converter, and the AC bus is connected to the upper-level distribution network through a transformer; the battery energy storage unit is electrically connected to the AC bus through the AC / DC converter, the load is electrically connected to the AC bus through the AC / AC converter, the electrolytic hydrogen production unit includes an electrolyzer, a compressor and a hydrogen storage tank, the electrolyzer is electrically connected to the AC bus through the AC / DC converter, and the compressor is electrically connected to the AC bus through the AC / AC converter.

[0019] Embodiment 2: The method for producing hydrogen by wind and solar power complementation based on alkaline water electrolysis comprises the following steps: S1, build a composite electrolyzer evaluation model and calculate the optimal model, including: S101, construct the evaluation model; S102, constructing an ANP judgment matrix; S103, consistency check of judgment matrix; S104, constructing an ANP supermatrix; S105, stabilization of the ANP weighted supermatrix; S106, calculate the optimal model: By assigning values ​​to the judgment matrix respectively, we can finally get 4 sets of stable weight data. The weight average of the 4 sets of data is calculated using the arithmetic average method to get the final indicators and solution weights.

[0020] S2, mathematical modeling of wind-solar hybrid hydrogen production system; S3, calculate and compare the results based on the mathematical modeling of the wind-solar hybrid hydrogen production system.

[0021] Preferably, in step S101, in the evaluation model, the control layer is the most preferred type of composite electrolyzer, and the network layer is divided into two clusters: a scheme cluster and an indicator cluster; A total of seven related indicators were extracted to form the indicator cluster U1, including rated current density u11, hydrogen production u12, hot start time u13, dynamic response time u14, electrolyzer life u15, component aging rate u16, and equipment cost u17; four candidate schemes were determined by expert experience method to form the scheme cluster U2, including AEL and PEMEL capacity ratio of 1:1u21, AEL and PEMEL capacity ratio of 1.5:1u22, AEL and PEMEL capacity ratio of 2:1u23, and AEL and PEMEL capacity ratio of 2.5:1u24; AEL represents alkaline electrolyzer, and PEMEL represents proton exchange membrane electrolyzer; The expert survey method is used to determine whether the indicators are independent, whether there is an interaction relationship, and whether there is a feedback relationship between the various schemes and the indicators. Finally, it is determined that all indicators in the system have an interactive relationship, and each scheme has a feedback relationship with each indicator. The schemes are independent of each other and have no mutual influence.

[0022] Preferably, in step S102, three types of judgment matrices are generated: the first type is the influence between the indicators, that is, the importance of each indicator relative to other indicators, and a total of seven judgment matrices can be generated; the second type is the influence of each indicator on each solution, that is, the importance of each solution relative to each indicator, and a total of seven judgment matrices can be generated; the third type is the influence of each solution on each indicator, that is, the importance of each indicator relative to each solution, and a total of four judgment matrices can be generated; the element values ​​in the judgment matrix adopt Satty's 9-level scaling method.

[0023] Preferably, in step S103, the random consistency ratio ξ of the judgment matrix is ​​calculated CR : If CR <0.1, then the consistency of the judgment matrix is ​​considered to meet the conditions; if ξ CR ≥0.1, then adjust the value size in the judgment matrix until ξ is satisfied CR So far, CR The calculation formula is: ; In the formula, is the consistency index of the judgment matrix; is the average random consistency index of the judgment matrix, λ max is the maximum eigenvalue of the judgment matrix; n is the order of the judgment matrix.

[0024] Preferably, in step S104, the method for constructing the ANP supermatrix is: Suppose cluster U in the network layer i The element in (i=1, 2, ..., N) is u i1 、u i2 、…、u in , U j The element in (j=1, 2, ..., N) is u j1 、u j2 、…、u jn ; Will U i and U j The elements in the matrix are compared with each other to obtain the judgment matrix. If the judgment matrix satisfies the consistency test, the weight column vector [w i1，jk , w i2，jk ,…,w in，jk ] T (k=1, 2, …, n; Writing it in matrix form, we can get the weight vector matrix W ij for: ; W ij The column vector of is Ui Element u i1 、u i2 、…、u in ; for U j Element u j1 、u j2 、…、u jn The importance weight vector of j The elements are not affected by U i The elements in the ij =0, and then we can get the supermatrix W; since there are only 2 clusters in the network layer, that is, N=2, the supermatrix W is: ; Each element in the supermatrix is ​​a matrix, but W is not a normalized matrix; in order to facilitate calculation, the supermatrix columns are normalized, that is, the elements of the supermatrix W are weighted to obtain the weighted supermatrix , where the elements , is the weighting factor.

[0025] Preferably, in step S105, the method for stabilizing the ANP weighted supermatrix is: Weighted Supermatrix Perform stabilization processing and calculate the limiting value of the following formula: ; If this limit converges and is unique, the column vectors in the matrix are the stable weights of each evaluation index.

[0026] Preferably, the mathematical modeling of the wind-solar complementary hydrogen production system includes wind-solar power generation model modeling, water electrolysis hydrogen production model modeling, hydrogen storage model modeling and hydrogen production cost calculation; The wind and solar power generation model includes wind power generation model and photovoltaic power generation model: Calculate the fan output power P wt : ; In the formula, is the output mechanical torque of the wind turbine; is the angular velocity of the wind turbine; is the air density; R0 is the radius of the wind turbine impeller; v is the real-time wind speed; C p is the efficiency value, which is related to the tip speed ratio and the pitch angle; The photovoltaic power generation power PPV is as follows: ; In the formula, C1 and C2 are the volt-ampere characteristic adjustment coefficients; Im is the maximum current; V m is the maximum voltage; Isc is the short-circuit current; V oc is the open circuit voltage; V PV Output voltage for photovoltaic power generation equipment.

[0027] Preferably, the water electrolysis hydrogen production model is: The electrolytic cells in the system include AEL and PEMEL. At any temperature, the UI equation of AEL is: ; Where r1 and r2 are the ohmic resistance parameters of the electrolyte; Urev is the reversible voltage; T el is the electrolytic cell temperature; A cell is the electrolysis module area; I el is the DC current; s1, s2, s3, t1, t2, t3 are the electrode overvoltage coefficients; The working characteristics of PEMEL water electrolysis hydrogen production are expressed by the relationship between voltage and current density. The total electrolysis voltage V pem By the open circuit voltage V ocv , activation overpotential V act , diffusion overpotential V diff and Ohmic overpotential V ohm The composition is shown in the following formula: ; ; Where R is the gas constant; T is the electrolysis temperature; z is the number of molar electrons involved in the electrolysis reaction; F is the Faraday constant; a H2 、a O2 、a H2O are the activities of hydrogen, oxygen, and water, respectively, and a H2O =1; Ta and Tc are the reaction temperatures of the anode and cathode respectively; α a and α c are the charge transfer coefficients of the anode and cathode, respectively; J is the current density; J 0，a and J 0，c are the exchange current densities of the anode and cathode respectively; C O2，m and C H2，m are the oxygen and hydrogen concentrations at the interface between the membrane and the porous electrode, respectively; C O2，mo and C H2，mo are the standard reference values ​​of oxygen and hydrogen concentrations at the interface between the membrane and the porous electrode, respectively; δm is the thickness of the membrane; σm is the resistivity of the membrane; the amount of hydrogen produced yH2 by AEL and PEMEL2 electrolyzers is shown in the following formula: ; In the formula, is the Faraday efficiency, M is the number of electrolytic cell units, and I is the electrolytic cell current.

[0028] Preferably, the hydrogen storage model is: the hydrogen storage module mainly uses a hydrogen storage tank to store hydrogen, and the net hydrogen storage rate of the hydrogen storage tank is: ; In the formula, is the net hydrogen storage rate of the hydrogen storage tank at time t; , They are the hydrogen inlet and outlet rates of the hydrogen storage tank at time t respectively; The cost of hydrogen production is calculated as: ; In the formula, C inv is the equipment investment coefficient; L is the full life cycle of the system; n H2 is the total hydrogen production during the entire life cycle of the system; C pur，i and C r，i They are the equipment purchase cost and operation and maintenance cost, including the equipment purchase cost and operation and maintenance cost of wind turbines, photovoltaic arrays, AEL and PEMEL.

Claims

1. A wind-solar complementary hydrogen production system based on alkaline water electrolysis, characterized in that: It includes a photovoltaic power generation unit, a wind power generation unit, a battery energy storage unit, an electrolytic hydrogen production unit, a load and a power electronic converter; the power electronic converter includes an AC / DC converter and an AC / AC converter; the photovoltaic power generation unit is electrically connected to the AC bus through an AC / DC converter, the wind power generation unit is electrically connected to the AC bus through an AC / AC converter, and the AC bus is connected to the upper-level distribution network through a transformer; the battery energy storage unit is electrically connected to the AC bus through an AC / DC converter, and the load is electrically connected to the AC bus through an AC / AC converter. The electrolytic hydrogen production unit includes an electrolyzer, a compressor and a hydrogen storage tank, the electrolyzer is electrically connected to the AC bus through an AC / DC converter, and the compressor is electrically connected to the AC bus through an AC / AC converter.

2. The method for producing hydrogen by wind and solar power complementation based on alkaline water electrolysis according to claim 1, characterized in that: The following steps are involved: S1, build a composite electrolyzer evaluation model and calculate the optimal model, including: S101, construct the evaluation model; S102, constructing an ANP judgment matrix; S103, consistency test of judgment matrix; S104, constructing an ANP supermatrix; S105, stabilization of the ANP weighted supermatrix; S106, calculate the optimal model: Assign values ​​to the judgment matrix respectively, and finally get four sets of stable weight data. Use the arithmetic mean method to calculate the weight average of the four sets of data to get the final indicators and solution weights. S2, mathematical modeling of wind-solar hybrid hydrogen production system; S3, calculate and compare the results based on the mathematical modeling of the wind-solar hybrid hydrogen production system.

3. The method for producing hydrogen by wind and solar power complementation based on alkaline water electrolysis according to claim 2, characterized in that: In step S101, in the evaluation model, the control layer is the optimal type of composite electrolyzer, and the network layer is divided into two clusters: a scheme cluster and an indicator cluster; A total of seven related indicators were extracted to form the indicator cluster U1, including rated current density, hydrogen production, hot start time, dynamic response time, electrolyzer life, component aging rate and equipment cost; four candidate schemes were determined by expert experience method to form the scheme cluster U2, including AEL and PEMEL capacity ratio of 1:1, AEL and PEMEL capacity ratio of 1.5:1, AEL and PEMEL capacity ratio of 2:1, AEL and PEMEL capacity ratio of 2.5:1; AEL represents alkaline electrolyzer, PEMEL represents proton exchange membrane electrolyzer; The expert survey method is used to determine whether the indicators are independent, whether there is an interaction relationship, and whether there is a feedback relationship between the various schemes and the indicators. Finally, it is determined that all indicators in the system have an interactive relationship, and each scheme has a feedback relationship with each indicator. The schemes are independent of each other and have no mutual influence.

4. The method for producing hydrogen by wind and solar power complementation based on alkaline water electrolysis according to claim 3, characterized in that: In step S102, three types of judgment matrices are generated: the first type is the influence between the indicators, that is, the importance of each indicator relative to other indicators, and a total of seven judgment matrices can be generated; the second type is the influence of each indicator on each plan, that is, the importance of each plan relative to each indicator, and a total of seven judgment matrices can be generated; the third type is the influence of each plan on each indicator, that is, the importance of each indicator relative to each plan, and a total of four judgment matrices can be generated; the element values ​​in the judgment matrix adopt Satty's 9-level scaling method.

5. The method for producing hydrogen by wind and solar power complementation based on alkaline water electrolysis according to claim 4, characterized in that: In step S103, the random consistency ratio ξ of the judgment matrix is ​​calculated CR : If CR <0.1, then the consistency of the judgment matrix is ​​considered to meet the conditions; if ξ CR ≥0.1, then adjust the value size in the judgment matrix until ξ is satisfied CR So far, CR The calculation formula is: ； In the formula, is the consistency index of the judgment matrix; is the average random consistency index of the judgment matrix, λ max is the maximum eigenvalue of the judgment matrix; n is the order of the judgment matrix.

6. The method for producing hydrogen by wind and solar power complementation based on alkaline water electrolysis according to claim 5, characterized in that: In step S104, the method for constructing the ANP supermatrix is: Suppose cluster U in the network layer i The element in (i=1, 2, ..., N) is u i1 、u i2 、…、u in , U j The element in (j=1, 2, ..., N) is u j1 、u j2 、…、u jn ; Will U i and U j The elements in the matrix are compared with each other to obtain the judgment matrix. If the judgment matrix satisfies the consistency test, the weight column vector [w i1，jk , w i2，jk ,…,w in，jk ] T (k=1, 2, …, n; Writing it in matrix form, we can get the weight vector matrix W ij for: ； W ij The column vector of is U i Element u i1 、u i2 、…、u in ; for U j Element u j1 、u j2 、…、u jn The importance weight vector of j The elements are not affected by U i The elements in the ij =0, and then we can get the supermatrix W; since there are only 2 clusters in the network layer, that is, N=2, the supermatrix W is: ； Each element in the supermatrix is ​​a matrix, but W is not a normalized matrix; in order to facilitate calculation, the supermatrix columns are normalized, that is, the elements of the supermatrix W are weighted to obtain the weighted supermatrix , where the elements , is the weighting factor.

7. The method for producing hydrogen by wind and solar power complementation based on alkaline water electrolysis according to claim 6, characterized in that: In step S105, the ANP weighted supermatrix stabilization processing method is: Weighted Supermatrix Perform stabilization processing and calculate the following limit value: ； If this limit converges and is unique, the column vectors in the matrix are the stable weights of each evaluation index.

8. The method for producing hydrogen by wind and solar power complementation based on alkaline water electrolysis according to claim 2, characterized in that: Mathematical modeling of wind-solar hybrid hydrogen production system includes wind-solar power generation model modeling, water electrolysis hydrogen production model modeling, hydrogen storage model modeling and hydrogen production cost calculation; The wind and solar power generation model includes wind power generation model and photovoltaic power generation model: Calculate the fan output power P wt : ； In the formula, is the output mechanical torque of the wind turbine; is the angular velocity of the wind turbine; is the air density; R0 is the radius of the wind turbine impeller; v is the real-time wind speed; C p is the efficiency value, which is related to the tip speed ratio and the pitch angle; The photovoltaic power generation power PPV is as follows: ； In the formula, C1 and C2 are the volt-ampere characteristic adjustment coefficients; Im is the maximum current; V m is the maximum voltage; I sc is the short-circuit current; V oc is the open circuit voltage; V PV Output voltage for photovoltaic power generation equipment.

9. The method for producing hydrogen by wind and solar power complementation based on alkaline water electrolysis according to claim 8, characterized in that: The model of hydrogen production by water electrolysis is: The electrolytic cells in the system include AEL and PEMEL. At any temperature, the UI equation of AEL is: ； Where r1 and r2 are the ohmic resistance parameters of the electrolyte; Urev is the reversible voltage; T el is the electrolytic cell temperature; A cell is the electrolysis module area; I el is the DC current; s1, s2, s3, t1, t2, t3 are the electrode overvoltage coefficients; The working characteristics of PEMEL water electrolysis hydrogen production are expressed by the relationship between voltage and current density. The total electrolysis voltage V pem By the open circuit voltage V ocv , activation overpotential V act , diffusion overpotential V diff and Ohmic overpotential V ohm The composition is shown in the following formula: ； ； Where R is the gas constant; T is the electrolysis temperature; z is the number of molar electrons involved in the electrolysis reaction; F is the Faraday constant; a H2 、a O2 、a H2O are the activities of hydrogen, oxygen, and water, respectively, and a H2O =1; Ta and Tc are the reaction temperatures of the anode and cathode respectively; α a and α c are the charge transfer coefficients of the anode and cathode, respectively; J is the current density; J 0，a and J 0，c are the exchange current densities at the anode and cathode, respectively; C O2，m and C H2，m are the oxygen and hydrogen concentrations at the interface between the membrane and the porous electrode, respectively; C O2，mo and C H2，mo are the standard reference values ​​of oxygen and hydrogen concentrations at the interface between the membrane and the porous electrode, respectively; δm is the thickness of the membrane; σm is the resistivity of the membrane; the amount of hydrogen produced yH2 by AEL and PEMEL2 electrolyzers is shown in the following formula: ； In the formula, is the Faraday efficiency, M is the number of electrolytic cell units, and I is the electrolytic cell current.

10. The method for producing hydrogen by wind and solar power complementation based on alkaline water electrolysis according to claim 9, characterized in that: The hydrogen storage model is as follows: the hydrogen storage module mainly uses hydrogen storage tanks to store hydrogen, and the net hydrogen storage rate of the hydrogen storage tank is: ； In the formula, is the net hydrogen storage rate of the hydrogen storage tank at time t; , They are the hydrogen inlet and outlet rates of the hydrogen storage tank at time t respectively; The cost of hydrogen production is calculated as: ； In the formula, C inv is the equipment investment coefficient; L is the full life cycle of the system; n H2 is the total hydrogen production during the entire life cycle of the system; C pur，i and C r，i They are the equipment purchase cost and operation and maintenance cost, including the equipment purchase cost and operation and maintenance cost of wind turbines, photovoltaic arrays, AEL and PEMEL.

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