8992 results about "Electrolytic cell" patented technology

The invention provides a method for participating in primary frequency modulation control of a power system based on a modular large-scale hydrogen production power supply, and the method comprises the steps: obtaining an original data flow from a high-precision synchronous phasor measurement unit, an electrolytic cell and a submodule, and carrying out the multi-scale decomposition and noise reduction processing after time synchronization and anomaly detection restoration; performing state estimation by using unscented Kalman filtering, extracting frequency disturbance characteristics in combination with empirical mode decomposition and Hilbert transform, and estimating the inertia of the power grid; an electrolytic cell dynamic model is established, and parameter identification and optimization are carried out through a recursive least square method; a control strategy is designed based on a multi-time scale control framework, virtual synchronous generator parameters are optimized through online Gaussian process regression, and frequency modulation control is realized in combination with scene tree random model predictive control and minimum-maximum regret learning; and finally, carrying out coordination control through a distributed consistency algorithm and carrying out multi-target performance evaluation optimization. And the frequency modulation performance and the operation efficiency of the system are improved.

The invention discloses a photovoltaic off-grid hydrogen production system and a control method thereof, and the method comprises the following steps: obtaining original data of an environment sensor, carrying out synchronous collection through a distributed data collection system, and obtaining standardized environment data through an STL algorithm, Z-score standardization and wavelet noise reduction processing; carrying out photovoltaic output power prediction by adopting an integrated learning method, and carrying out MPPT control optimization; an electrolytic cell dynamic model is constructed, multi-objective optimization and energy storage system state estimation are carried out, and energy storage optimization scheduling is achieved; and finally, realizing overall optimization of the system through a multi-time-scale coordination control framework. The system operation efficiency is improved, the system reliability is enhanced, the operation cost is reduced, and the system is particularly suitable for an off-grid hydrogen production scene with large photovoltaic energy volatility.

The invention discloses a non-energy-storage off-grid photovoltaic hydrogen production system and a control method. The control method comprises five steps of environmental data acquisition and preprocessing, photovoltaic cell output power estimation, electrolytic cell power management, converter control parameter optimization and system performance evaluation and adaptive adjustment. The method comprises the following steps: firstly, processing environmental data by adopting an isolation forest algorithm, Kriging interpolation and an empirical mode decomposition method, and extracting time sequence features; and then combining with the estimated photovoltaic output power. And then the genetic algorithm and dynamic programming are utilized to realize electrolytic cell power optimization distribution. And then converter control parameters are optimized through subspace identification, pole assignment and a hybrid optimization algorithm. And finally, system performance evaluation and adaptive adjustment are realized by adopting a sliding time window method, singular spectrum analysis and a fuzzy prediction control method. The technical problems of the energy-storage-free photovoltaic hydrogen production system in the aspects of environmental data processing, power estimation, energy management, control optimization and the like are solved, and the operation efficiency and reliability of the system are improved.

The invention discloses an operation state monitoring method and system for AEM water electrolysis hydrogen production equipment, particularly relates to the technical field of electrolytic bath operation monitoring control, and aims to solve the problem of efficiency nonlinear fluctuation caused by polarization mode alternating dominance and microstructure degradation under a low current density working condition in the prior art. Extracting polarization fluctuation characteristics by generating a dynamic response sequence and calculating a dynamic coupling degree to identify a polarization alternating dominant mode; analyzing a local blocking probability based on frequency characteristics, positioning an active site sparse region in combination with temperature gradient spatial distribution characteristics, and generating an efficiency fluctuation evaluation coefficient; an active site sparse region and a dynamic compensation factor matrix of a cathode flow field pressure gradient are constructed to cooperatively adjust an anode current density distribution weight and a cathode pressure gradient parameter, so that an adjusting variable is accurately matched with a local blocking probability and a dynamic coupling degree; the multi-scale correlation analysis of the microcosmic degradation state and the macroscopic efficiency fluctuation of the electrolytic cell is realized, and the operation stability under the low current density is remarkably improved.

The invention relates to the technical field of electrolytic refining, and provides an electrochemical device and method for extracting metal from molten salt. The electrochemical device comprises an anode, a cathode, an insulating container, an electrolytic bath and an ultrasonic stirring device. The cathode comprises a conductive part and liquid metal; the insulating container is provided with a containing space, the top side of the containing space is open, the liquid metal is contained in the containing space, and a part of the conductive part is inserted into the liquid metal; the electrolytic bath is provided with a containing cavity used for containing molten salt, the insulating container can be used for being immersed in the molten salt so that liquid metal can make contact with the molten salt, and one part of the anode is used for being inserted into the molten salt; a portion of the ultrasonic stirring device is inserted into the liquid metal for oscillating the liquid metal. The liquid metal is subjected to ultrasonic oscillation in the electrolysis process, so that the possibility that metal dendrites are formed on a reduction product or a high-melting-point alloy layer is formed on the surface of the liquid metal is effectively reduced, the reaction efficiency of electrolytic extraction is improved, and the quality of the extracted reduction product is improved.

The invention discloses a DC bus voltage fluctuation suppression method of a renewable energy hydrogen production system, and relates to the technical field of renewable energy electrolysis hydrogen production. The method comprises the following steps: collecting system operation parameters in real time; bus voltage disturbance power is estimated based on a disturbance observer, and frequency decomposition is carried out; fusing the ARIMA model and the LSTM model to predict the load power, and calculating a prediction deviation; dynamically setting upper and lower limits of a bus voltage control interval according to the predicted deviation and the operation state; a multi-objective optimization function is constructed, bus voltage disturbance power, prediction deviation and a control limit value are comprehensively considered, and power regulation instructions of battery energy storage, a fuel cell and an electrolytic cell are solved; and executing power regulation control to realize bus voltage stabilization. The method can improve the grading response capability of voltage disturbance, the prediction accuracy of load power change, the adaptability of the control boundary and the overall operation stability of the system, and is suitable for the electric energy quality control of the hydrogen production system in a multi-source fluctuation scene.

The invention discloses an alkaline electrolytic water hydrogen evolution electrode, a preparation method thereof and an electrolytic bath based on the electrode. The electrode comprises a nickel net base material, raney nickel located on the nickel net base material and a catalytic layer which is electrochemically deposited on the surface of the raney nickel to cover a zigzag edge to form a smooth surface. The catalytic layer is a platinum catalytic layer, a nickel-sulfur alloy catalytic layer, a nickel-cobalt-zinc layer or a nickel-iron-zinc layer, and an electroplate liquid for electrochemical deposition comprises sulfosalicylic acid. According to the electrolytic cell, an alkaline electrolytic water hydrogen evolution electrode is used as a cathode, and Raney nickel / nickel net is used as an anode. According to the alkaline electrolytic water hydrogen evolution electrode, the catalyst layer which is high in binding force with the base material is deposited on the Raney nickel / nickel net base material in a specific electrochemical deposition mode, and the catalyst layer can effectively cover the sawtooth-shaped edge of the surface of the electrode and keep a part of the original high-specific-surface-surface structure of Raney nickel at the same time; the catalytic performance of the electrode is improved, and the overpotential of the electrode under 100mA / cm < 2 > can be lower than 241mV.

The invention discloses a differentiated precise current distribution control method in a multi-workpiece batch electroplating process. The method comprises the following steps: acquiring multi-workpiece feature data and preprocessing the multi-workpiece feature data; workpiece difference characteristic analysis and grouping are carried out; modeling and analyzing the electric field distribution of the electrolytic cell; plating layer growth dynamic monitoring and prediction are carried out; and generating a differential current distribution strategy. A multi-frequency differential resistance spectrum acquisition system is adopted to realize real-time monitoring of plating layer growth, an improved independent component analysis algorithm fused with spatial constraint is applied to perform workpiece group resistance spectrum decoupling, and micro-area accurate current modulation is realized through a self-adaptive waveform library of an electric field distortion area. The problems that dynamic characteristics of plating layers are difficult to monitor and differentiation control of workpieces with similar characteristics is insufficient in multi-workpiece electroplating are solved, and the quality consistency of the plating layers is improved.

The electrochemical mechanical polishing method and device are characterized in that a workpiece clamping device is adjusted according to the size of the semiconductor wafer and is adsorbed on a pressurizing device, and the semiconductor wafer is connected to a positive electrode of a power supply through a conducting ring to serve as an anode of an electrolysis system; the fixed abrasive pad is fixed on the polishing disc through a conductive adhesive and is connected to a power supply cathode through a conductive ring to serve as a cathode of the electrolysis system; during polishing, a polishing solution is connected with a conductive adhesive for fixing the polishing pad through a through hole in the fixed abrasive pad to form an electrolytic tank path, chemical oxidation and anodic oxidation are carried out on the surface of the third-generation semiconductor wafer during polishing to form a passivation oxide layer with low hardness, and valleys of the passivation oxide layer are passivated and protected. And the peak is quickly removed by the fixed abrasive, so that a polishing mode of anodizing and online removing the surface of the third-generation semiconductor wafer is realized. The method has the advantages of high abrasive utilization rate, high material removal rate, good surface quality, recycling of the polishing solution and the like.

The invention discloses a one-key starting system and method for an alkaline water electrolysis hydrogen production device, the system comprises a control system and a one-key starting control unit, and the control system is connected with the one-key starting control unit; the one-key start control unit comprises a standby panel soft button, a start panel soft button, a make-up pump selection soft button and a drainage panel soft button; therefore, the whole starting process of the alkaline water electrolysis hydrogen production device is subjected to sequential control integration, a safe and efficient one-key starting scheme with high automation degree is formed, safety risks in the manual starting process are avoided, manpower is saved, the labor cost is reduced, meanwhile, the starting time is shortened, unnecessary energy waste in the starting process is reduced, and the starting efficiency is improved. Therefore, the problems that the starting speed of the cluster electrolytic cell is low and the starting operation difficulty of the cluster electrolytic cell is high due to human factors in a large-scale electrolytic hydrogen production project are solved.

The invention relates to the field of durability testing of anion-exchange membrane electrolytic cells, in particular to a durability testing method of an anion-exchange membrane electrolytic cell. The durability testing method for the anion exchange membrane electrolytic cell comprises the following testing steps: S1, assembling the electrolytic cell; s2, activation and initial testing; s3, accelerated durability test: (a) running for 100 hours under the rated current density; (b) running for 100 hours at high current density; (c) periodically and alternately operating for 100 hours at the rated current density and the high current density; and S4, evaluating after testing. According to the application, load fluctuation in practical application is simulated through dynamic working conditions, and a degradation process similar to long-term steady-state operation can be induced within 300 hours in combination with a high-current-density acceleration condition. According to the method, the period of several months or even one year required by a traditional steady state test is shortened to several weeks through scientific design of a test process, and meanwhile, the consistency of a test result and an actual working condition is ensured.

The invention provides a water electrolysis hydrogen production monitoring and control method with dynamic fluctuation adaptability, and relates to the technical field of hydrogen production. Comprising the steps that a multi-dimensional operation parameter set of an electrolytic cell is collected in real time through a multi-source sensor array, an electrolysis process prediction model is established based on the LSTM and the CNN neural network, and therefore the prediction result of the electrolysis state is determined. And according to the prediction result, a dynamic parameter adjustment matrix is constructed, and the electrolytic current density, the electrolyte concentration and other key parameters of the electrolytic cell are adjusted for the first time through fuzzy PID control. After adjustment, the multi-dimensional operation parameter set is updated, the health degree index of the electrolytic cell is calculated, and the relation between the index and a preset health index threshold value is monitored in real time. And second-time adjustment is carried out according to the monitoring result, so that safe and efficient operation of the electrolytic cell under the dynamic fluctuation condition is ensured. The problems that in the prior art, an electrolytic cell is slow in response to load change, insufficient in monitoring capacity, dependent on manual maintenance and the like are effectively solved.

A method for producing product gas (PG) comprising methane is disclosed, the method comprising the steps of providing a biomass (BM), subjecting the biomass (BM) to an anaerobic digestion to produce biogas (BG) and a biomass digestate (BMD), separating the biomass digestate (BMD) into a liquid digestate fraction (LDF) and a solid digestate fraction (SDF), and subjecting the liquid digestate fraction to microbial electrolysis cell (MEC) processing to produce methane and / or hydrogen gas. Also, a system for producing product gas (PG) comprising methane is disclosed.

The invention relates to a durability test method and device, electronic equipment and a readable storage medium, the durability test method is used for testing the durability of an electrolytic catalyst, and the test method comprises the following steps: obtaining first test data of a to-be-tested electrolytic cell; a catalyst is arranged in the to-be-detected electrolytic cell; performing target working condition testing on the to-be-tested electrolytic cell according to the operation data of the power supply; acquiring second test data after the to-be-tested electrolytic cell is subjected to the target working condition test; and obtaining the durability of the catalyst according to the first test data and the second test data. The specific power supply parameters in the target working condition test are determined based on the operation data of the power supply, and the condition of the to-be-tested electrolytic cell in the real working condition can be simulated, so that the durability test result is closer to the real use scene, and the durability test reliability is greatly improved.

The invention provides an electrolytic bath three-dimensional temperature field reconstruction method and system based on multi-physics field coupling, and belongs to the technical field of energy equipment thermal management, and the reconstruction method is applied to a reconstruction system comprising an acquisition module, a first processing module, a second processing module, a third processing module, a fourth processing module and a rendering module. The method specifically comprises the following steps: layering a three-dimensional model of the electrolytic cell according to a Z-axis direction, establishing a hierarchical database and setting a reference layer; generating initial temperature field distribution of the reference layer based on an anisotropic radial basis function interpolation algorithm; and establishing an electric-thermal-flow coupling equation, solving according to the hierarchical database, obtaining temperature field distribution of a reference layer, mapping the temperature field distribution to a three-dimensional space, correcting the temperature field distribution by combining interlayer temperature attenuation and a transverse thermal diffusion effect, obtaining target temperature field distribution, and carrying out visualization processing on the target temperature field distribution. Nonlinear temperature distribution of the electrolytic cell can be completely reproduced, and the accuracy of three-dimensional temperature field reconstruction of the electrolytic cell is guaranteed.

The invention relates to the technical field of metal smelting, and provides an electrolytic refining device which comprises an anode assembly, a cathode assembly and an electrolytic bath, the cathode assembly comprises a cathode structure, the cathode structure comprises an ultrasonic transducer and a cathode head, the cathode head is connected with the ultrasonic transducer, and the ultrasonic transducer converts ultrasonic electric signals into mechanical vibration; the electrolytic bath is used for containing electrolyte, and at least part of the anode assembly and at least part of the cathode head are arranged in the electrolytic bath. The ultrasonic transducer drives the cathode head to vibrate, so that dendritic crystals gathered on the surface of the cathode head fall off, dendritic crystal accumulation on the surface of the cathode head is reduced, the surface of the cathode head keeps active, the service life of the cathode structure is prolonged, the electrolytic refining reaction rate and stability are improved, the electrolytic refining reaction can be continuously and uniformly carried out, and energy consumption in the electrolytic process is reduced. The maintenance cost and the production downtime are reduced, and the current efficiency and the collection rate of target metal are improved.

The invention relates to a SOEC (Solid Oxide Electrolyte Cell) hydrogen production system and an operation method thereof. The SOEC hydrogen production system comprises an SOEC galvanic pile module, a deionized water pump, a deionized water preheater, a heat exchange type steam generator, an ejector, a feed gas preheater, a hydrogen preheater, a fan, an air preheater, a combustor, a stop valve, a heat tracing band, a power supply, a control system, a pipeline, a temperature sensor and the like. The system is provided with the combustor, the heat exchange type steam generator and the heat exchanger, heat generated by combustion of natural gas is used for providing heat for high-temperature raw material gas and high-temperature air required by the SOEC hydrogen production system in a heat exchange mode, meanwhile, heat of high-temperature gas at an outlet of an SOEC galvanic pile module is recycled, and the power consumption of the SOEC hydrogen production system is effectively reduced; in addition, the high-temperature raw material gas containing hydrogen is heated in a heat exchange mode instead of an electric heating mode, so that the safety of the hydrogen production system is effectively improved; the system is low in power consumption, stable, reliable and high in operability.

The invention discloses a micro-grid system planning and design method and device based on double-layer optimization, and relates to the field of micro-grid system planning and design, and the method comprises the following steps: S1, collecting the operation data of wind power, photovoltaic, hydropower, an energy storage power station, an electrolytic cell and a hydrogen storage tank in a micro-grid system, and the load data of the micro-grid system; s2, constructing a micro-grid system double-layer optimization model based on a double-layer optimization method; the upper-layer model is a capacity optimization layer, and the maximum total income within the operating age limit is used as a target function; the lower-layer model is a scheduling optimization layer, the maximum operation net income in a scheduling period is taken as an objective function, and system power balance, equipment operation and capacity are taken as constraint conditions; and S3, solving the double-layer optimization model by using an improved grey wolf algorithm and a solver. The microgrid system is planned and designed through a double-layer optimization method, a clean energy power generation and energy storage device capacity configuration scheme is reasonably configured, and an energy scheduling strategy is optimized.

The invention discloses a double-channel hydrogen production system optimization control method for a multi-power-supply scene, and the method comprises the steps: constructing a double-channel hydrogen production system, and obtaining corresponding operation data; decomposing and reconstructing based on the operation data to obtain the initial input power of the electrolytic cell; formulating a start-stop rule of the electrolytic cell based on the initial input power; correcting the initial input power based on a start-stop rule to obtain actual hydrogen production power; an electrolytic cell mathematical model is constructed, and the unit hydrogen production cost and the energy conversion efficiency are obtained based on the actual hydrogen production power; establishing a target function based on the unit hydrogen production cost and the energy conversion efficiency; and optimizing the target function based on a multi-target particle swarm algorithm to obtain an optimal filtering reconstruction order and an electrolytic cell retention ratio, and completing power distribution and optimal capacity configuration of the double-channel hydrogen production system. Power division and capacity configuration of the alkaline electrolytic bath and the PEM electrolytic bath are achieved, the hydrogen production cost of the wind-solar coupled system is effectively reduced, and the energy conversion efficiency of the electrolytic bath is improved.

The invention relates to a multi-cell control method for hydrogen production alkaline electrolytic cells based on nonlinear model predictive control, which belongs to the technical field of hydrogen production and comprises the following steps of: performing data acquisition on key positions of a hydrogen production alkaline electrolytic cell system in real time; based on the dynamically determined priority of each electrolytic cell, dynamic load distribution of each electrolytic cell is carried out, and a multi-dimensional cooperative regulation strategy is implemented to obtain a hydrogen yield target value of each electrolytic cell; constructing a nonlinear model comprising an electrolytic reaction model, a heat transfer model and an inter-tank coupling model, and performing parameter identification and verification; and designing a nonlinear model predictive control algorithm, performing discretization processing on the nonlinear model, introducing Kalman filtering to process the uncertainty of the model, taking a corresponding hydrogen yield target value reached by each electrolytic cell on the premise of meeting the constraint as a final control target, constructing an optimized target function, and performing solving to obtain an optimal control scheme. Compared with the prior art, the control precision and the system stability can be effectively improved.

The invention relates to an optimal configuration and scheduling method and system for a wind-solar hydrogen production and storage system matched with a hydrogen demand, and the method comprises the following steps: converting a configuration problem of the wind-solar hydrogen production and storage system into a double-layer optimization problem according to the demand matching of the wind-solar hydrogen production and storage system and a hydrogen end, initial hydrogen production system parameters, initial new energy power generation system parameters and initial hydrogen storage system parameters are set according to the hydrogen demand curve, and new energy configuration energy storage system parameters and hydrogen production electrolytic cell parameters are determined to serve as inputs for establishing a wind and light hydrogen production and storage system optimization model based on constraint conditions; the upper-layer model takes the minimum life cycle cost of the wind-solar hydrogen production and storage system as an optimization target, and the lower-layer model takes the optimal efficiency of the wind-solar hydrogen production and storage system as an optimization target; solving the double-layer optimization model by adopting a beetle antennae search algorithm to obtain the capacity optimal configuration and the whole life cycle minimum cost of the wind and light hydrogen production and storage system; and according to the hydrogen utilization load interval prediction result and the hydrogen storage capacity, the current-day hydrogen production electrolytic cell operation strategy is optimized.

The invention provides a coordination control method and device for off-grid new energy hydrogen production, electronic equipment and a medium, and relates to the technical field of new energy hydrogen production. The coordination control method for off-grid new energy hydrogen production comprises the following steps: performing first coordination control on off-grid new energy hydrogen production based on a steady-state control mode under the condition that the actually measured current frequency of a system is within an adjustment dead zone range; under the condition that the current frequency of the system is not in the adjustment dead zone range, performing second coordination control based on the transient state control mode; after the second coordination control, under the condition that the current frequency of the system is not in the adjustment dead zone range, third coordination control is carried out on off-network new energy hydrogen production based on the emergency control mode; and after the third coordination control, under the condition that the current frequency of the system is not in the adjustment dead zone range, determining a to-be-cut power value of off-grid new energy hydrogen production according to an overcut principle. According to the method, the load adjusting characteristic of the hydrogen production electrolytic cell is considered, source-load interaction is achieved, and the absorption rate of new energy is increased.

The invention discloses a Coanda effect-based sand-proof and dust-proof device for an electrolytic bath, which is characterized in that a surrounding dust cover structure which is in flexible contact with the electrolytic bath or keeps a non-contact gap with the electrolytic bath is formed at the periphery of a full-load-bearing movable bracket, and the dust cover structure forms a semi-closed protection structure between a foundation and the electrolytic bath; dustproof cover structures composed of fences are arranged on the two sides of a foundation with profile steel as the foundation, each dustproof cover structure at least comprises a vertical fence wall arranged on the side portion of the full-bearing type movable bracket, the bottom of each vertical fence wall is connected with the foundation, and the top of each vertical fence wall makes flexible contact with the electrolytic cell or forms a non-contact gap with the electrolytic cell. A continuous variable-curvature Coanda curved surface is adopted, the airflow speed is increased through the wall attachment effect, a laminar flow air curtain is formed, and curvature-flow velocity coupling optimization is formed. Compressed air is injected through the narrow slit nozzle, ambient air is pried to form a large-flow air curtain, the actually measured air curtain coverage area is 3.2 times that of a traditional flow guide plate, and the unit energy consumption is reduced by 57%.

The invention belongs to the technical field of source and load storage optimal configuration, and particularly relates to a hydrogen energy storage-containing high-speed service area source and load storage optimal configuration method and device, and the method comprises the steps: constructing a high-speed service area architecture comprising a photovoltaic array, an energy storage battery, a hydrogen fuel cell, an electrolytic cell, a hydrogen storage tank and a load; constructing a storage battery model and a hydrogen energy storage system model; establishing a multi-service-area collaborative optimization model; establishing an upper-layer model and setting constraint conditions of the upper-layer model by taking minimization of the internal total operation cost and investment cost of the high-speed service area as a target function; establishing a lower-layer model and setting constraint conditions of the lower-layer model by taking the minimum single-day operation cost of the high-speed service area as an objective function; and taking the upper-layer model as a planning layer, taking the lower-layer model as an operation layer, and iteratively solving the double-layer model to obtain a high-speed service area source-load-storage optimal configuration scheme. Through collaborative optimization of the hydrogen energy storage system and the multiple service areas, the operation cost is remarkably reduced, and the reliability and economical efficiency of the high-speed service area are improved.

The invention discloses a preparation method and application of an amorphous nickel-cobalt-iron phosphate anode catalyst, and belongs to the technical field of alkaline water electrolysis hydrogen production, the preparation method comprises the following steps: (1) dissolving transition metal salt in a solvent, and stirring to obtain a metal salt solution; (2) dissolving phosphate in a solvent, and stirring to obtain a phosphate solution; and (3) adding the phosphate solution into the metal salt solution for reaction, washing with deionized water and ethanol, centrifugally separating, and drying to obtain the amorphous nickel-cobalt-iron phosphate anode catalyst. According to the preparation method and application of the amorphous nickel-cobalt-iron phosphate anode catalyst, process safety improvement and environmental friendliness optimization are achieved through an all-water-phase green synthesis system, the obtained catalyst shows excellent performance in an AEM electrolytic cell, the cell voltage is only 1.87 V under the current density of 2 A / cm, and the method has remarkable industrial application prospects.

The invention discloses a hybrid hydrogen production system coupled with photovoltaic renewable energy and an optimal configuration method, and relates to the technical field of new energy utilization and energy storage control, and the hybrid hydrogen production system comprises a photovoltaic power generation unit, an alkaline water electrolytic tank unit, a proton exchange membrane electrolytic tank unit, a hydrogen storage unit, a control unit and the like. Photovoltaic electric energy is directly supplied to the two types of electrolytic cell stacks through the direct current bus, a traditional DC-DC power converter is omitted, and loss in the energy transmission process is reduced; and through a dynamic electrolytic cell switching algorithm configured by the control unit, the input proportion and the number of operation units of the two stacks are changed and adjusted in real time, and the quick response capability and the long-term stability are both considered. The system can stably produce hydrogen under the condition of renewable energy fluctuation, can dynamically adapt to input power change, can realize maximum power point tracking control on the premise of not using extra power conversion equipment, and remarkably reduces initial investment cost and operation energy consumption while ensuring hydrogen production efficiency.

The invention relates to a wind power off-grid hydrogen production system and a control method thereof. The system comprises a wind driven generator, a black start power supply, an energy storage converter, a machine side converter, a grid side converter, a direct current bus capacitor, a first transformer, a second transformer, a third transformer, an AC-DC converter, a DC-DC converter, an electrolytic bath, a first switch, a second switch, a third switch and a fourth switch. The system comprises a black start mode, a normal operation mode and an emergency operation mode. In the black-start mode, the system is started from a closed state to an operating state through a black-start power supply; in the normal operation mode, the system power balance is maintained by adjusting the electrolysis power; in the emergency operation mode, the system power balance is maintained by adjusting the output power of the wind driven generator; according to the system, the flexible adjusting capacity of the load of the electrolytic cell can be fully explored, an energy storage device except a black-start power supply does not need to be additionally arranged, and wind power off-grid hydrogen production without energy storage can be achieved.

A water electrolysis hydrogen production system, and a method and apparatus for controlling gas purity in a water electrolysis hydrogen production process, relating to the technical field of electrolytic hydrogen production. The water electrolysis hydrogen production system comprises an electrolytic cell, a hydrogen gas-liquid separation unit, and an oxygen gas-liquid separation unit. A hydrogen side gas outlet of the electrolytic cell is connected to the hydrogen gas-liquid separation unit, and an oxygen side gas outlet of the electrolytic cell is connected to the oxygen gas-liquid separation unit. A liquid outlet of the hydrogen gas-liquid separation unit is connected to a first pipeline; a liquid outlet of the oxygen gas-liquid separation unit is connected to a second pipeline; the first pipeline and the second pipeline are converged and then connected to one end of an alkaline liquor backflow main pipeline; and the other end of the alkaline liquor backflow main pipeline is connected to an oxygen side pipeline and a hydrogen side pipeline. The hydrogen side pipeline is connected to a hydrogen side alkaline liquor flow channel inlet of the electrolytic cell, and the oxygen side pipeline is connected to an oxygen side alkaline liquor flow channel inlet of the electrolytic cell. The hydrogen side pipeline and the oxygen side pipeline are each provided with a flow measurement assembly and a flow adjustment assembly. The flows at the hydrogen side inlet and the oxygen side inlet of the electrolytic cell are respectively controlled, and the concentration of the alkaline liquor is kept consistent at the two sides.

The invention relates to the technical field of renewable energy hydrogen production and intelligent control, discloses a multi-target prediction control method and system based on an ALK-PEM hybrid electrolytic cell array, and solves the problems that in the prior art, wind and light power generation fluctuation cannot be deeply adapted, and hydrogen production economy, response speed and long-term reliability of equipment are difficult to consider. According to the scheme, the method comprises the following steps: obtaining wind-solar power generation power prediction data, and operating parameters and health state indexes of each ALK and PEM in a hybrid array to form a time sequence data set; a hybrid array prediction model based on data driving is constructed, a multi-target cost function is constructed by taking maximization of wind and light absorption, stable hydrogen production and minimization of equipment life loss as targets, rolling optimization is performed on the model, and an optimal power set point sequence of each electrolytic cell in a future preset time domain is solved; and in combination with the operating characteristic difference of the ALK and the PEM, a differential control instruction is generated and executed, and meanwhile, dynamic grouping management is performed on the hybrid array according to the wind-solar power prediction data and the health state of the electrolytic cell.

The invention discloses a multi-electrolytic cell collaborative optimization control method suitable for wide-range power fluctuation, and belongs to the technical field of new energy. According to the method, an optimization framework is adopted for collaborative optimization of hydrogen production power supply power, electrolytic cell power, electric energy storage power and electrolytic cell time sequence production state, a finite time domain rolling solving method is adopted in optimization, the rolling time domain length is hour level, the sampling time is minute level or hour level, an optimization objective function and a constraint model are established respectively, and the optimization objective function and the constraint model are optimized. And solving the optimization model by adopting a mathematical programming or heuristic algorithm to obtain the operation power of each device of the multi-electrolytic cell hydrogen production system and the electrolytic cell state. According to the method, under the wide-range power fluctuation working condition, battery energy storage weakening of frequent starting and stopping of the electrolytic cell is achieved, under the narrow-range power fluctuation working condition, battery energy storage is achieved, it is guaranteed that the electrolytic hydrogen production system operates at the optimal efficiency, and maximum energy utilization and efficient operation of the system are guaranteed; and a new method is provided for collaborative optimization control of the multi-electrolytic-bath hydrogen production system.