研究目的

To validate both large capacity and high conversion efficiency of the system to reduce the cost of the produced hydrogen. To demonstrate the flexibility of the proposed MPPT algorithm, which does not depend on specific characteristics of the PV modules and capacity of ELY system. To suggest the method to make a simulation model of the PV-ELY system only from on-site operation data to help investigate the system at different scales.

研究成果

The study demonstrates a high solar-to-hydrogen (STH) efficiency CO2-free hydrogen-production system by directly coupling a PEM electrolyzer with up-to-20 kW PV panels. The system achieved an averaged PV efficiency of 17.2%, electrolysis efficiency of 86.5%, and STH efficiency of 14.9% in a whole-day test. The hydrogen generation capacity was 18.6 Nm3, contributing to a CO2 reduction of 5.01 kg. The simulation model built from on-site data allows for the investigation of the PV-electrolyzer system without the need for preliminary or off-site tests, offering a method to check the condition of the entire system and each component in long-term operation.

研究不足

The technical and application constraints include the fluctuation of irradiance affecting the MPP of PV, the need for a method to maintain high STH efficiency throughout the day and year, and the challenges in matching the operating voltage of ELY and PV due to their different IeV characteristics.