System for producing hydrogen by electrolyzing water by using SOEC and control method thereof

The invention discloses a system for producing hydrogen by electrolyzing water through SOEC and a control method of the system. The system comprises a water supply system, a condensate water tank, a water pump, a steam generator, a heater, a single-chamber SOEC electrolysis module, a condenser and a gas separator. Liquid deionized water is introduced into a steam generator through a water pump, meanwhile, a heater is started to convert liquid water into water vapor, it is ensured that the temperature of the water vapor is larger than 250 DEG C, the flow of the water pump and the power of the heater are controlled, and once the inlet temperature of the water vapor reaches 400 DEG C or above, the electrolysis mode of the single-chamber SOEC electrolysis module is allowed to be started; and electrolysis is started to generate hydrogen. According to the system and the control method, the advantages of the SOEC technology are combined, the system and the control method have the advantages of being efficient, stabl