1.National User-Side Energy Storage Innovation Research and Development Center (North China University of Technology), Beijing 100144, China;2.Electric Power Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211103, China

Photovoltaic (PV) electrolytic water hydrogen production technology is an important way of realizing PV accommodation and green power hydrogen production. In fluctuating power input state, there are many problems in the operation stability of the electrolyzer hydrogen production system and the economy of hydrogen production. Aiming at these problems, a PV hydrogen production strategy based on hybrid-electrolyzer hydrogen production system is constructed, using the combination of alkaline electrolyer (AEL) water hydrogen production systems and proton exchange membrane electrolyzer (PEMEL) systems, and the power optimal control technology and capacity configuration method of the hybrid-electrolyzer hydrogen production system are proposed. Based on the combined operation and reasonable configuration of different types of electrolyzers, the performance of hydrogen production is improved. Results show that the quantity of hydrogen production of the hybrid electrolyzer hydrogen production system is improved by 5% compared with the single AEL hydrogen production system. The fluctuation rate and the hydrogen production cost are dramatically reduced compared with the PEMEL hydrogen electrolytic water production system. With the adoption of the power optimization control technology, the quantity of the hydrogen production is increased in the operation state with the same power. When the single electrolyzer is in the fluctuating working condition, the array rotation mode is adopted to ensure the safe operation of the electrolyzer system.

This work is supported by National Natural Science Foundation of China (Game control-based planning and simulation modelling of coupled optical storage hydrogen production system, No.52277211) and State Grid Corporation of China (No. J2023166).