An electrolysis system of the present disclosure includes an electrolyzer which includes an electrode to generate a gas from the electrode, and a tightening device which controls a tightening load on the electrolyzer in accordance with a pressure of the gas.

A method for performing an electrolysis using an electrolysis stack having multiple electrolysis cells, wherein each of the electrolysis cells has: an anode space with an anode, a cathode space with a cathode, a membrane that separates the anode space and the cathode space from each other, and a recombination catalyst. The method includes feeding an electrolysis medium to the electrolysis stack and determining a flow rate at which the electrolysis medium is fed to the electrolysis stack, providing electrical energy to the electrolysis stack for performing the electrolysis with the electrolysis medium fed to the electrolysis stack, and determining a degree of degradation of the membranes based on the determined flow rate of the electrolysis medium.

Various examples are directed to a solar power electrolyzer system comprising a first electrolyzer stack, a second electrolyzer stack, a first converter and a first converter controller. The first electrolyzer stack may be electrically coupled in series with a photovoltaic array. The first converter may be electrically coupled in series with the first electrolyzer stack and electrically coupled in series with the photovoltaic array. The second electrolyzer stack electrically may be coupled at an output of the first converter. The first converter controller may be configured to control a current gain of the first converter.

Various examples are directed to a solar power electrolyzer system comprising a first electrolyzer stack, a second electrolyzer stack, a first converter and a first converter controller. The first electrolyzer stack may be electrically coupled in series with a photovoltaic array. The first converter may be electrically coupled in series with the first electrolyzer stack and electrically coupled in series with the photovoltaic array. The second electrolyzer stack electrically may be coupled at an output of the first converter. The first converter controller may be configured to control a current gain of the first converter.

An alternating current electrolysis system, as well as a method and a device for controlling the alternating current electrolysis system are provided. The method includes: acquiring a voltage amplitude at an alternating current side of an electrolysis rectification power supply; and modifying an output parameter of the electrolysis rectification power supply based on the voltage amplitude. Compared with the conventional technology, the problem of oscillation of a power grid due to unbalanced power of the alternating current electrolysis system is effectively solved, thereby facilitating normal operation of a electrolysis station.

An alternating current electrolysis system, as well as a method and a device for controlling the alternating current electrolysis system are provided. The method includes: acquiring a voltage amplitude at an alternating current side of an electrolysis rectification power supply; and modifying an output parameter of the electrolysis rectification power supply based on the voltage amplitude. Compared with the conventional technology, the problem of oscillation of a power grid due to unbalanced power of the alternating current electrolysis system is effectively solved, thereby facilitating normal operation of a electrolysis station.

Fuel production system includes: synthesis gas generation unit configured to generate synthesis gas containing hydrogen and carbon monoxide from carbon-containing raw material; fuel production unit configured to produce fuel from synthesis gas generated; water electrolyzer configured to electrolyze water to generate water-electrolyzed hydrogen; hydrogen supply unit configured to supply water-electrolyzed hydrogen generated to synthesis gas generation unit; and controller. The controller is configured to perform: calculating input energy based on first energy possessed by raw material, second energy consumed by water electrolyzer, third energy consumed by synthesis gas generation unit, and fourth energy consumed by fuel production unit; calculating recovered energy based on fifth energy possessed by fuel produced; and determining supply amount of water-electrolyzed hydrogen to be supplied based on input energy and recovered energy calculated.

Fuel production system includes: synthesis gas generation unit configured to generate synthesis gas containing hydrogen and carbon monoxide from carbon-containing raw material; fuel production unit configured to produce fuel from synthesis gas generated; water electrolyzer configured to electrolyze water to generate water-electrolyzed hydrogen; hydrogen supply unit configured to supply water-electrolyzed hydrogen generated to synthesis gas generation unit; and controller. The controller is configured to perform: calculating input energy based on first energy possessed by raw material, second energy consumed by water electrolyzer, third energy consumed by synthesis gas generation unit, and fourth energy consumed by fuel production unit; calculating recovered energy based on fifth energy possessed by fuel produced; and determining supply amount of water-electrolyzed hydrogen to be supplied based on input energy and recovered energy calculated.

Various examples are directed to a solar power electrolyzer system comprising a first electrolyzer stack, a second electrolyzer stack, a first converter and a first converter controller. The first electrolyzer stack may be electrically coupled in series with a photovoltaic array. The first converter may be electrically coupled in series with the first electrolyzer stack and electrically coupled in series with the photovoltaic array. The second electrolyzer stack electrically may be coupled at an output of the first converter. The first converter controller may be configured to control a current gain of the first converter.

Various examples are directed to a solar power electrolyzer system comprising a first electrolyzer stack, a second electrolyzer stack, a first converter and a first converter controller. The first electrolyzer stack may be electrically coupled in series with a photovoltaic array. The first converter may be electrically coupled in series with the first electrolyzer stack and electrically coupled in series with the photovoltaic array. The second electrolyzer stack electrically may be coupled at an output of the first converter. The first converter controller may be configured to control a current gain of the first converter.