Electrolytic bath current acquisition method and device based on controlled current source

Abstract

The invention discloses an electrolytic bath current acquisition method and device based on a controlled current source, and the method comprises the steps: obtaining an activation overvoltage measurement value, correcting the activation overvoltage measurement value based on the key measurement point data of an electrolytic bath, and obtaining an activation overvoltage correction value; a controlled current source output current calculation value is obtained according to the activation overvoltage correction value, and a controlled current source module in the electrolytic cell equivalent circuit model is controlled to output the current; the electrolytic cell equivalent circuit model comprises the controlled current source module, and further comprises an ohmic resistance module, a double-electric-layer capacitor module and a reversible overvoltage module which are connected in series, and the controlled current source module is connected to the two ends of the double-electric-layer capacitor module in parallel; the electrolytic bath equivalent circuit model is powered on to operate, and the trunk current of the electrolytic bath equivalent circuit model is obtained and is the electrolytic bath current. According to the method, the strong dependence of electrolytic cell current calculation on activation overvoltage precision can be reduced, the module parameter setting time is shortened, and the accuracy of an equivalent model is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen production, and in particular relates to a method and device for obtaining electrolytic cell current based on a controlled current source. Background Art

[0002] Traditional fossil energy sources are facing increasing depletion, and achieving energy transition is a top priority for contemporary social development and the advancement of human civilization. To address the climate and environmental degradation caused by global carbon emissions, China has proposed a "dual carbon" strategy. The gradual replacement of fossil energy with renewable, clean hydrogen energy has high feasibility and market value. Hydrogen, as the most abundant element in the universe and a highly efficient energy carrier, has attracted considerable attention. In recent years, hydrogen production by water electrolysis has become a mainstream hydrogen production technology due to its advantages such as high maturity, flexible regulation, and high conversion rates. However, when electrolyzers are coupled with renewable energy sources such as wind and solar power, the power delivered to the electrolyzer fluctuates significantly due to the uncontrollable and discontinuous nature of wind and solar power. This negatively impacts the electrolyzer's service life and efficiency, limits the grid-connected operation of renewable energy generation, and hinders the development of hydrogen energy. Establishing a method for calculating electrolyzer current can support the study of integrated electricity-hydrogen operation strategies and electrical transient characteristics in renewable energy hydrogen production scenarios.

[0003] Many scholars have done a lot of work to analyze the dynamic response performance of alkaline electrolyzers powered by renewable energy. In the power supply-power consumption link, the electrolyzer can be seen as an electrical component. By establishing a dynamic mathematical module of the electrolyzer, its working characteristics under renewable energy power supply conditions can be deeply studied and its impact on the stability of the power system can be evaluated. Iribarren et al. published "Dynamic Modeling of a Pressurized AlkalineWater Electrolyzer: A Multiphysics Approach" in the IEEE journal. The article is based on 1 Nm 3 ·h -1Alkaline electrolyzers combine electrochemical and thermodynamic methods to faithfully reproduce the dynamic behavior of the system and achieve detailed characterization of the different phenomena occurring in the electrolyzer. Ursúa et al. published "Static–dynamic modelling of the electrical behavior of a commercial advanced alkaline water electrolyser" in the International Journal of Hydrogen Energy, analyzing the static and dynamic behavior of commercial advanced alkaline water electrolyzers and developing a complete and comprehensive static-dynamic electrical model to simulate the electrolyzer current value. The model is based on the thermodynamics, activation, double-layer capacitance effect and ohmic effect and phenomena that occur in the actual alkaline electrolysis process. However, the traditional equivalent circuit model has the following limitations when applied to large-capacity electrolyzers: (1) The thermal inertia effect is significant, making it difficult to accurately simulate the impedance characteristics; (2) EIS testing of megawatt-level electrolyzers is difficult to conduct, and the double-layer capacitance value is difficult to accurately measure; (3) The parameter calibration process of the controlled source model is cumbersome, time-consuming and inefficient, and difficult to adapt to changing working conditions.

[0004] In summary, this solution was developed to overcome the problems and defects of traditional controlled current source modules, such as their strong dependence on high precision of activation overvoltage and the high complexity of parameter adjustment. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and device for obtaining electrolytic cell current based on a controlled current source, which can reduce the strong dependence of electrolytic cell current calculation on the accuracy of activation overvoltage, shorten the module parameter setting time and improve the accuracy of the equivalent model.

[0006] In order to achieve the above object, the solution of the present invention is: A method for obtaining electrolytic cell current based on a controlled current source comprises the following steps: Step 1: obtaining an activation overvoltage measurement value, and correcting the activation overvoltage measurement value based on key measurement point data of the electrolytic cell to obtain an activation overvoltage correction value; Step 2: obtaining a calculated value of a controlled current source output current based on the activation overvoltage correction value, and controlling a controlled current source module in an electrolytic cell equivalent circuit model to output the current; wherein the electrolytic cell equivalent circuit model includes the controlled current source module, and also includes an ohmic resistance module, a double-layer capacitor module, and a reversible overvoltage module connected in series, and the controlled current source module is connected in parallel to both ends of the double-layer capacitor module; Step 3: The electrolytic cell equivalent circuit model is powered on to operate, and the main circuit current of the electrolytic cell equivalent circuit model is obtained, that is, the electrolytic cell current.

[0007] Wherein, in said step 1, the activation overvoltage measurement value is corrected based on the key measurement point data of the electrolytic cell, including: Obtain key measurement point data of the electrolytic cell; Determine the state interval to which the key measurement point data of the electrolytic cell belongs based on the data, and obtain the correction amount corresponding to the state interval; The activation overvoltage measurement value is corrected based on the correction amount to obtain an activation overvoltage correction value.

[0008] Wherein, determining the state interval to which the key measurement point data of the electrolytic cell belongs and obtaining the correction amount corresponding to the state interval includes: Obtaining first key measurement point data X1 of the electrolytic cell, comparing the first key measurement point data X1 with a corresponding first correction threshold value X10, and determining a first state interval to which the first key measurement point data X1 belongs based on the comparison result; Continue to determine whether further determination is required in the first state interval. If so, compare the required second key measurement point data X2 with the corresponding second calibration threshold X20, and determine the second state interval to which it belongs based on the comparison result. Repeat this step until the final state interval is determined. If not, the first state interval is the final state interval. Obtain a correction amount corresponding to the final state interval.

[0009] The activation overvoltage measurement value is corrected based on the correction amount to obtain an activation overvoltage correction value, including: Change the correction amount △ V and activation overvoltage measurement value V Add together to get the activation overvoltage correction value V act =△ V + V .

[0010] Among them, the key measurement point data of the electrolytic cell include but are not limited to the electrolytic cell current, electrolytic cell voltage, anode and cathode circulating alkali solution temperature, hydrogen side and oxygen side gas pressure, electrolytic cell system pressure, hydrogen content in oxygen, oxygen content in hydrogen, and alkali solution flow rate.

[0011] Wherein, in said step 2, obtaining the calculated value of the output current of the controlled current source according to the activation overvoltage correction value includes: The output current of the controlled current source is calculated according to the following formula: , Where, i act Calculate the output current of the controlled current source; k 1, k 2, k 3, z1, z 2, z 3 is the parameter, T is temperature; V act is the activation overvoltage correction value, N s is the number of electrolytic cell groups connected in series.

[0012] Wherein, in said step 2, the method for constructing the electrolytic cell equivalent circuit model is: Powering on the electrolytic cell circuit, obtaining equivalent capacitance, equivalent resistance, and overpotential data during the operation of the electrolytic cell, setting the resistance value of the ohmic resistance module to the equivalent resistance, setting the capacitance value of the double-layer capacitance module to the equivalent capacitance, and setting the reversible overvoltage module to the overpotential; The ohmic resistance module, the double-layer capacitor module, and the reversible overvoltage module are connected in series, and a controlled current source module is connected at both ends of the double-layer capacitor module.

[0013] An electrolytic cell current acquisition device based on a controlled current source, comprising: a data acquisition module configured to obtain activation overvoltage measurements; a voltage correction module configured to correct the activation overvoltage measurement value based on key measurement point data of the electrolytic cell to obtain an activation overvoltage correction value; A controlled current source module output current control module is configured to obtain a calculated value of a controlled current source output current based on the activation overvoltage correction value, and control the controlled current source module in the electrolytic cell equivalent circuit model to output the current; wherein the electrolytic cell equivalent circuit model includes the controlled current source module, and also includes an ohmic resistance module, a double-layer capacitor module, and a reversible overvoltage module connected in series with each other, and the controlled current source module is connected in parallel to both ends of the double-layer capacitor module; and, The main circuit current acquisition module is configured to acquire the main circuit current of the electrolytic cell equivalent circuit model, that is, the electrolytic cell current, when the electrolytic cell equivalent circuit model is powered on and running.

[0014] The voltage correction module corrects the activation overvoltage measurement value based on the key measurement point data of the electrolytic cell, including: Obtain key measurement point data of the electrolytic cell; Determine the state interval to which the key measurement point data of the electrolytic cell belongs based on the data, and obtain the correction amount corresponding to the state interval; The activation overvoltage measurement value is corrected based on the correction amount to obtain an activation overvoltage correction value.

[0015] Wherein, determining the state interval to which the key measurement point data of the electrolytic cell belongs and obtaining the correction amount corresponding to the state interval includes: Obtaining first key measurement point data X1 of the electrolytic cell, comparing the first key measurement point data X1 with a corresponding first correction threshold value X10, and determining a first state interval to which the first key measurement point data X1 belongs based on the comparison result; Continue to determine whether further determination is required in the first state interval. If so, compare the required second key measurement point data X2 with the corresponding second calibration threshold X20, and determine the second state interval to which it belongs based on the comparison result. Repeat this step until the final state interval is determined. If not, the first state interval is the final state interval. Obtain a correction amount corresponding to the final state interval.

[0016] The activation overvoltage measurement value is corrected based on the correction amount to obtain an activation overvoltage correction value, including: Change the correction amount △ V and activation overvoltage measurement value V Add together to get the activation overvoltage correction value V act =△ V + V .

[0017] Among them, the key measurement point data of the electrolytic cell include but are not limited to the electrolytic cell current, electrolytic cell voltage, anode and cathode circulating alkali solution temperature, hydrogen side and oxygen side gas pressure, electrolytic cell system pressure, hydrogen content in oxygen, oxygen content in hydrogen, and alkali solution flow rate.

[0018] The output current control module of the controlled current source module obtains the calculated output current value of the controlled current source according to the activation overvoltage correction value, including: The output current of the controlled current source is calculated according to the following formula: , Where, i act Calculate the output current of the controlled current source; k 1, k 2, k 3, z 1, z 2, z 3 is the parameter, T is temperature; V act is the activation overvoltage correction value, N s is the number of electrolytic cell groups connected in series.

[0019] Among them, the construction method of the electrolytic cell equivalent circuit model is: Powering on the electrolytic cell circuit, obtaining equivalent capacitance, equivalent resistance, and overpotential data during the operation of the electrolytic cell, setting the resistance value of the ohmic resistance module to the equivalent resistance, setting the capacitance value of the double-layer capacitance module to the equivalent capacitance, and setting the reversible overvoltage module to the overpotential; The ohmic resistance module, the double-layer capacitor module, and the reversible overvoltage module are connected in series, and a controlled current source module is connected at both ends of the double-layer capacitor module.

[0020] By adopting the above scheme, the present invention dynamically adjusts the activation overvoltage correction value through the control module, combined with the calculation module to output the precise output current value of the controlled current source. This design reduces the dependence on the activation overvoltage accuracy, significantly shortens the parameter setting time, and improves the accuracy of the equivalent model. Specifically, by optimizing the control strategy, the present invention achieves a more accurate description of the complex electrochemical processes within the electrolytic cell, especially with significant advantages in simulating thermal inertia effects and impedance characteristics under high-capacity operating conditions.

[0021] Compared with the prior art, the beneficial effects of the present invention are: (1) reducing dependence: by optimizing the current source control strategy, the dependence on high-precision measurement of activation overvoltage is significantly reduced; (2) improving efficiency: simplifying the parameter adjustment process, reducing the module parameter adjustment time, and improving operating efficiency; (3) enhancing accuracy: by optimizing the dynamic characteristic response, the accuracy of current calculation is improved, which can more accurately reflect the system operation status; (4) improving system performance: enhancing the flexibility and stability of the water electrolysis hydrogen production system, and adapting to the dynamic requirements under complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of a method for obtaining electrolytic cell current based on a controlled current source; Figure 2 It is a structural diagram of the control module of the controlled current source module; Figure 3 It is a logic flow chart of multiple condition judgment of the control module of the controlled current source module; Figure 4 This is the equivalent circuit diagram of the electrolytic cell based on the controlled current source module; Figure 5 It is a schematic diagram of the calculation module structure. DETAILED DESCRIPTION

[0023] The technical solutions and beneficial effects of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, the present invention provides a method for obtaining electrolytic cell current based on a controlled current source, which specifically includes the following steps: S1: Establish a control module to obtain an activation overvoltage correction value based on the activation overvoltage measurement value; The control module determines the electrolytic cell state interval based on the real-time temperature and total voltage. Each state interval corresponds to an activation overvoltage correction value. The activation overvoltage measurement value measured in the electrolytic cell is corrected based on the correction value, and the activation overvoltage correction value is finally output, i.e., the measured value + the correction value = the correction value. S2: Establishing a calculation module, coupling the control module with the calculation module by receiving and transmitting the activation overvoltage correction value, and obtaining a controlled current source module; The calculation module calculates the output current calculated value of the controlled current source according to the input activation overvoltage correction value, and controls the actual output current of the controlled current source module to be equal to the calculated output current calculated value of the controlled current source; S3: Connect the controlled current source module in parallel to both sides of the double-layer capacitor module, and then connect it in series with the ohmic resistance module and the reversible overvoltage module to obtain the electrolytic cell equivalent circuit model; S4: Based on the equivalent circuit model, the electrolytic cell current is obtained.

[0025] The equivalent circuit of the present invention obtains the output current response through the changes in temperature and total voltage. The key measurement point data such as the gas pressure on the hydrogen side and the oxygen side, the system pressure, the hydrogen in oxygen, the oxygen content in hydrogen, and the alkali solution flow rate are the data in the electrolytic cell process flow in a time sequence.

[0026] As a possible implementation of this embodiment, the electrolytic cell current acquisition method and device based on a controlled current source is: ①Establish control module like Figure 2 As shown in Figure 1, the control module inputs are the electrolytic cell alkali temperature, activation overvoltage measurement value, and electrolytic cell total voltage, and the output is the activation overvoltage correction value. Figure 3 As shown, the control module determines the working state interval of the electrolytic cell through multiple condition judgment logic. Specifically, in the multiple condition judgment sequence, the monitoring quantity is set x i , x j , x k , threshold y ia , y ib , y ja , y jb , y ka , y kb , y ia >y ib , y ja > y jb , y ka > y kb : If the monitoring amount x i Less than threshold y ia Greater than threshold y ib , then the control module logic judgment interval is x i The first state interval, otherwise the control module logic judgment interval is x i Second state interval; According to the judgment result, the corresponding monitoring quantity is continued to be selected in the corresponding state interval to define its corresponding state interval.

[0027] like Figure 2 As shown, the control module in the present invention monitors the alkali solution temperature and the total electrolytic cell voltage, respectively. The state intervals for the different monitored variables are divided by adjusting thresholds. Within each state interval, the activation overvoltage measurement value and the correction value are related by basic arithmetic operations, and the result of these operations is the activation overvoltage correction value. The difference between the activation overvoltage correction value and the measured value is considered the activation overvoltage correction value. This correction value is determined by observing and comparing the error between the simulated output value and the actual value, and adjusting the constants and coefficients in the calculation.

[0028] ②Establish calculation module Cooperate Figure 5 As shown, the controlled current source calculation module takes the calculation result of the control module as input. Combined with the deformation of the Tafel formula, the relationship between the calculated value of the output current of the controlled current source and the activation overvoltage correction value can be expressed by formula (1): (1) Where, k 1, k 2, k 3, z 1, z 2, z 3 is a parameter, which can be obtained through multiple test debugging. In this embodiment, z 1- z 3Determine the current growth rate, k 1- k 3. Determine the current amplitude and debug it; N s is the number of electrolytic cell units connected in series,i act is the output current of the controlled current source, V act is the activation overvoltage correction value, T is the temperature (℃).

[0029] Adjust the parameters of the controlled current source module calculation module k 1, k 2, k 3, z 1, z 2, z 3. The activation overvoltage correction amount in the control module is determined to obtain the calculated output current value of the controlled current source.

[0030] ③Establish an equivalent circuit model The electrolytic cell current device is obtained by connecting a controlled current source module and a double-layer capacitor module in parallel. Specifically: Double layer capacitor module: The double-layer capacitance effect of the electrolytic cell can be established based on the principle of parallel plate capacitors and can be expressed by formula (2): (2) Where, ε is the dielectric constant, S is the effective area of ​​the capacitor, k is the electrostatic force constant, d is the vertical distance between parallel plate modules.

[0031] Controlled current source module: It is composed of the above-mentioned control module and calculation module, and the control module and the calculation module establish a coupling relationship by transmitting the activation overvoltage correction value.

[0032] Based on the actual electrolytic cell circuit, the ohmic resistance module and the reversible overvoltage module are established. The specific methods are as follows: Ohm resistor module: The ohmic resistance of the electrolytic cell is mainly composed of membrane resistance, electrode resistance, electrolyte resistance and bubble resistance. During the actual operation of the electrolytic cell, the current density is usually less than 1A / cm 2 At this time, the bubble resistance of the electrolytic cell is very small, and the influence on the ohmic resistance module can usually be ignored. The membrane resistance and electrode resistance are expressed by formula (3) (4), the electrolyte resistance is expressed by formula (5), and the electrode conductivity and electrolyte conductivity are expressed by formula (6) and (7): (3) (4) (5) (6) (7) Where, δ m is the diaphragm thickness; p m is the membrane porosity; τ m Indicates the degree of diaphragm curvature; S m is the cross-sectional area of ​​the diaphragm, S a,c is the effective area of ​​the electrode, δ a,c is the electrode thickness, σ a,c is the electrode conductivity, σ KOH 30% wtKOH conductivity, T is the temperature (℃), m is the electrolyte molar concentration.

[0033] Reversible overvoltage module: In the actual electrolysis process, the concentrations of reactants and products near the electrode surface change as the reaction proceeds, causing the actual electrode potential to deviate from the theoretical equilibrium potential, thereby generating an overpotential. This can be specifically expressed by equations (8), (9), and (10): (8) (9) (10) in, R is the gas constant ( R =8.314 J / mol · K ); T is the working temperature in the electrolytic cell; F is the Faraday constant ( F =96485); P is the operating pressure in the electrolytic cell; P H2O Indicates the partial pressure of water vapor in the electrolytic cell; α H2O Represents the activity of water.

[0034] like Figure 4 As shown, the controlled current source module is connected in parallel to both sides of the double-layer capacitor module, and then connected in series with the ohmic resistance module and the reversible overvoltage module to obtain the electrolytic cell equivalent circuit model.

[0035] ④Calculate the electrolytic cell current based on Figure 4The equivalent circuit model shown, the input voltage V in Applied between the positive and negative electrodes of the equivalent circuit, the current of the driving circuit flows. The double layer capacitor is connected in parallel with the controlled current source, and the voltage across it is the activation overvoltage. Activation overvoltage correction value V act The output of the control module directly acts on the controlled current source calculation module to adjust its output current. Key parameters such as electrolytic cell temperature and system pressure are measured and obtained in real time by sensors.

[0036] The equivalent circuit consists of the following modules working together: The ohmic resistance module is connected in series with the main circuit to quantify the conduction losses of the electrolytic cell, and its voltage drop directly affects the circuit current distribution. The reversible overvoltage module is connected in series with the circuit to characterize the thermodynamic equilibrium potential shift of the electrolysis reaction and determine the minimum driving voltage requirement of the system. The double-layer capacitor module characterizes the transient charge storage effect of the double layer at the electrode interface, generating charge and discharge currents when the input voltage suddenly changes. The voltage across it is the measured value of the electrolytic cell's activation overvoltage. The controlled current source module is connected in parallel with both sides of the double-layer capacitor, and its output current is driven by the activation overvoltage dynamically corrected by the control module.

[0037] The current calculation logic is as follows: Based on the electrical characteristics of the equivalent circuit, the input voltage V in The driving circuit generates current in the main circuit, and the control module generates current according to the real-time electrolyte temperature and input voltage of the electrolytic cell. V in The activation overvoltage correction is dynamically calculated based on the measured activation overvoltage value of the circuit and output. The calculation module receives this correction value and processes it through a built-in algorithm to output the steady-state current value of the controlled current source, which is also the calculated activation voltage value. For transient operating conditions (such as start-up and shutdown or power fluctuations), the electrolyzer current is composed of the superposition of the output current of the controlled current source and the charge and discharge current of the double-layer capacitor, that is: (11) in, i act is the steady-state current of the controlled current source output by the calculation module, C dl is the equivalent capacitance of the double layer capacitor, is the voltage change rate. Since the capacitor charging and discharging effect decays in milliseconds ( τ = RC ), in steady state, only i act The model uses dynamic correction and transient compensation to ensure that the calculated current values ​​under all operating conditions accurately match the measured data, making it particularly suitable for scenarios with fluctuating power supply from renewable energy.

[0038] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk drives, CD-ROMs, optical storage devices, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention may be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0039] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0040] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0041] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0042] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0043] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for obtaining electrolytic cell current based on a controlled current source, characterized in that The steps include: Step 1: obtaining an activation overvoltage measurement value, and correcting the activation overvoltage measurement value based on key measurement point data of the electrolytic cell to obtain an activation overvoltage correction value; Step 2: obtaining a calculated value of a controlled current source output current based on the activation overvoltage correction value, and controlling a controlled current source module in an electrolytic cell equivalent circuit model to output the current; wherein the electrolytic cell equivalent circuit model includes the controlled current source module, and also includes an ohmic resistance module, a double-layer capacitor module, and a reversible overvoltage module connected in series, and the controlled current source module is connected in parallel to both ends of the double-layer capacitor module; Step 3: The electrolytic cell equivalent circuit model is powered on to operate, and the main circuit current of the electrolytic cell equivalent circuit model is obtained, that is, the electrolytic cell current.

2. The electrolytic cell current acquisition method based on a controlled current source according to claim 1, characterized in that: In the step 1, the activation overvoltage measurement value is corrected based on the key measurement point data of the electrolytic cell, including: Obtain key measurement point data of the electrolytic cell; Determine the state interval to which the key measurement point data of the electrolytic cell belongs based on the data, and obtain the correction amount corresponding to the state interval; The activation overvoltage measurement value is corrected based on the correction amount to obtain an activation overvoltage correction value.

3. The electrolytic cell current acquisition method based on a controlled current source according to claim 2, characterized in that: Determine the state interval to which the key measurement point data of the electrolytic cell belongs according to the data, and obtain the correction value corresponding to the state interval. include, Obtaining first key measurement point data X1 of the electrolytic cell, comparing the first key measurement point data X1 with a corresponding first correction threshold value X10, and determining a first state interval to which the first key measurement point data X1 belongs based on the comparison result; Continue to determine whether further determination is required in the first state interval. If so, compare the required second key measurement point data X2 with the corresponding second calibration threshold X20, and determine the second state interval to which it belongs based on the comparison result. Repeat this step until the final state interval is determined. If not, the first state interval is the final state interval. Obtain a correction amount corresponding to the final state interval.

4. The electrolytic cell current acquisition method based on a controlled current source according to claim 2, characterized in that: Correcting the activation overvoltage measurement value based on the correction amount to obtain an activation overvoltage correction value includes: Change the correction amount △ V and activation overvoltage measurement value V Add together to get the activation overvoltage correction value V act =△ V + V .

5. The electrolytic cell current acquisition method based on a controlled current source according to claim 1 or 2, characterized in that: The key measurement point data of the electrolytic cell include but are not limited to the electrolytic cell current, electrolytic cell voltage, anode and cathode circulating alkali solution temperature, hydrogen side and oxygen side gas pressure, electrolytic cell system pressure, hydrogen content in oxygen, oxygen content in hydrogen, and alkali solution flow rate.

6. The electrolytic cell current acquisition method based on a controlled current source according to claim 1, characterized in that: In the step 2, obtaining the calculated output current value of the controlled current source according to the activation overvoltage correction value includes: The output current of the controlled current source is calculated according to the following formula: ， Where, i act Calculate the output current of the controlled current source; k 1, k 2, k 3, z 1, z 2, z 3 is the parameter, T is temperature; V act is the activation overvoltage correction value, N s is the number of electrolytic cell groups connected in series.

7. The electrolytic cell current acquisition method based on a controlled current source according to claim 1, characterized in that: In step 2, the method for constructing the electrolytic cell equivalent circuit model is: Powering on the electrolytic cell circuit, obtaining equivalent capacitance, equivalent resistance, and overpotential data during the operation of the electrolytic cell, setting the resistance value of the ohmic resistance module to the equivalent resistance, setting the capacitance value of the double-layer capacitance module to the equivalent capacitance, and setting the reversible overvoltage module to the overpotential; The ohmic resistance module, the double-layer capacitor module, and the reversible overvoltage module are connected in series, and a controlled current source module is connected at both ends of the double-layer capacitor module.

8. An electrolytic cell current acquisition device based on a controlled current source, characterized in that: include, a data acquisition module configured to obtain activation overvoltage measurements; a voltage correction module configured to correct the activation overvoltage measurement value based on key measurement point data of the electrolytic cell to obtain an activation overvoltage correction value; A controlled current source module output current control module is configured to obtain a calculated value of a controlled current source output current based on the activation overvoltage correction value, and control the controlled current source module in the electrolytic cell equivalent circuit model to output the current; wherein the electrolytic cell equivalent circuit model includes the controlled current source module, and also includes an ohmic resistance module, a double-layer capacitor module, and a reversible overvoltage module connected in series with each other, and the controlled current source module is connected in parallel to both ends of the double-layer capacitor module; and, The main circuit current acquisition module is configured to acquire the main circuit current of the electrolytic cell equivalent circuit model, that is, the electrolytic cell current, when the electrolytic cell equivalent circuit model is powered on and running.

9. The electrolytic cell current acquisition device based on a controlled current source according to claim 8, characterized in that: The voltage correction module corrects the activation overvoltage measurement value based on the key measurement point data of the electrolytic cell, including: Obtain key measurement point data of the electrolytic cell; Determine the state interval to which the key measurement point data of the electrolytic cell belongs based on the data, and obtain the correction amount corresponding to the state interval; The activation overvoltage measurement value is corrected based on the correction amount to obtain an activation overvoltage correction value.

10. The electrolytic cell current acquisition device based on a controlled current source according to claim 9, characterized in that: Determine the state interval to which the key measurement point data of the electrolytic cell belongs according to the data, and obtain the correction value corresponding to the state interval. include, Obtaining first key measurement point data X1 of the electrolytic cell, comparing the first key measurement point data X1 with a corresponding first correction threshold value X10, and determining a first state interval to which the first key measurement point data X1 belongs based on the comparison result; Continue to determine whether further determination is required in the first state interval. If so, compare the required second key measurement point data X2 with the corresponding second calibration threshold X20, and determine the second state interval to which it belongs based on the comparison result. Repeat this step until the final state interval is determined. If not, the first state interval is the final state interval. Obtain a correction amount corresponding to the final state interval.

11. The electrolytic cell current acquisition device based on a controlled current source according to claim 9, characterized in that: Correcting the activation overvoltage measurement value based on the correction amount to obtain an activation overvoltage correction value includes: Change the correction amount △ V and activation overvoltage measurement value V Add together to get the activation overvoltage correction value V act =△ V + V .

12. The electrolytic cell current acquisition device based on a controlled current source according to claim 8 or 9, characterized in that: The key measurement point data of the electrolytic cell include but are not limited to the electrolytic cell current, electrolytic cell voltage, anode and cathode circulating alkali solution temperature, hydrogen side and oxygen side gas pressure, electrolytic cell system pressure, hydrogen content in oxygen, oxygen content in hydrogen, and alkali solution flow rate.

13. The electrolytic cell current acquisition device based on a controlled current source according to claim 8, characterized in that: The output current control module of the controlled current source module obtains the calculated output current value of the controlled current source according to the activation overvoltage correction value, including: The output current of the controlled current source is calculated according to the following formula: ， Where, i act Calculate the output current of the controlled current source; k 1, k 2, k 3, z 1, z 2, z 3 is the parameter, T is temperature; V act is the activation overvoltage correction value, N s is the number of electrolytic cell groups connected in series.

14. The electrolytic cell current acquisition device based on a controlled current source according to claim 8, characterized in that: The method for constructing the electrolytic cell equivalent circuit model is: Powering on the electrolytic cell circuit, obtaining equivalent capacitance, equivalent resistance, and overpotential data during the operation of the electrolytic cell, setting the resistance value of the ohmic resistance module to the equivalent resistance, setting the capacitance value of the double-layer capacitance module to the equivalent capacitance, and setting the reversible overvoltage module to the overpotential; The ohmic resistance module, the double-layer capacitor module, and the reversible overvoltage module are connected in series, and a controlled current source module is connected at both ends of the double-layer capacitor module.

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