Abstract: An eco-friendly energy storage system for frequency regulation, includes: a water electrolysis apparatus and a hydrogen storage apparatus for performing discharge of surplus power for a power system; a fuel cell power generation apparatus for performing charge of deficiency power; and a control device for controlling charge and discharge by detecting a system frequency for controlling charge and discharge of the system, comparing the system frequency with a frequency reference value, and reflecting a frequency regulation amount calculated on the basis of a hydrogen storage amount of the system.

Abstract: Disclosed is a water electrolysis system that improves durability by preventing performance degradation inside a water electrolysis stack. According to the present invention, in order to reduce electrode degradation in a water electrolysis unit cell, which can frequently occur in the starting and stopping stages of a process for producing hydrogen from the water electrolysis system, power of a constant current is supplied to the water electrolysis stack and electrolyte circulating water is heated while being circulated in the water electrolysis stack in the starting stage of the water electrolysis system. Also, when performing a stopping process, power of a constant current is supplied to the water electrolysis stack and electrolyte circulating water is cooled while being circulated in the water electrolysis stack. Accordingly, it is possible to improve durability by preventing performance degradation inside the water electrolysis stack.

Abstract: A water electrolysis system including a water electrolysis stack having a structure where a plurality of unit cells and a separator plate are stacked and produces hydrogen and oxygen, a variable current power supplying supplies electrical energy, an electrolyte circulation line through which an electrolyte supplied to the water electrolysis stack circulates, a first electrolyte tank being provided on the electrolyte circulation line and is provided with a heating device, a first bypass line that branches off from the electrolyte circulation line at a first point located at a front end of the first electrolyte tank in a flow direction of an electrolyte, bypasses the first electrolyte tank, and is joined with the electrolyte circulation line at a second point located at a rear end of the first electrolyte tank, and a second electrolyte tank that is provided on the first bypass line, and a method of operating the same.

Abstract: A method of operating a water electrolysis system including a water electrolysis stack discharging moisture-containing hydrogen gas, a plurality of dehumidification devices including a regenerative adsorbent removing moisture from the moisture-containing hydrogen gas discharged from the water electrolysis stack, temperature and pressure sensors detecting an internal temperature and pressure of each of the plurality of dehumidification devices, and a heating device heating the plurality of dehumidification devices, and in which the plurality of dehumidification devices are connected in parallel to a hydrogen gas supply pipe connecting the water electrolysis stack and the plurality of dehumidification devices and a hydrogen gas discharge pipe discharging moisture-reduced hydrogen gas from the plurality of dehumidification devices and are alternately used to remove moisture from the moisture-containing hydrogen gas, and the hydrogen gas supply pipe and the hydrogen gas discharge pipe are provided with a pluralit

Abstract: Disclosed is a water electrolysis system that improves durability by preventing performance degradation inside a water electrolysis stack. According to the present invention, in order to reduce electrode degradation in a water electrolysis unit cell, which can frequently occur in the starting and stopping stages of a process for producing hydrogen from the water electrolysis system, power of a constant current is supplied to the water electrolysis stack and electrolyte circulating water is heated while being circulated in the water electrolysis stack in the starting stage of the water electrolysis system. Also, when performing a stopping process, power of a constant current is supplied to the water electrolysis stack and electrolyte circulating water is cooled while being circulated in the water electrolysis stack. Accordingly, it is possible to improve durability by preventing performance degradation inside the water electrolysis stack.

Abstract: An eco-friendly energy storage system for frequency regulation, includes: a water electrolysis apparatus and a hydrogen storage apparatus for performing discharge of surplus power for a power system; a fuel cell power generation apparatus for performing charge of deficiency power; and a control device for controlling charge and discharge by detecting a system frequency for controlling charge and discharge of the system, comparing the system frequency with a frequency reference value, and reflecting a frequency regulation amount calculated on the basis of a hydrogen storage amount of the system.