China has made remarkable progress in its solar energy sector, achieving a total installed capacity of 610 million kilowatts in photovoltaic power generation. This advancement is coupled with continuous improvements in photovoltaic technology and cost reductions, leading to diverse development models like 'PV+'. However, challenges arise due to the variability of photovoltaic power generation, impacting power grid stability. To counter this, efficient energy storage methods are essential, with hydrogen emerging as a promising solution. By integrating hydrogen generation and storage with solar energy, the instability issues in photovoltaic power systems can be mitigated effectively. Hydrogen not only enhances grid flexibility but also finds applications across various sectors due to its environmental friendliness and storage capabilities. The development of hydrogen as a long-term energy storage medium can balance electricity production and consumption, aiding in power grid flexibility. The integration of photovoltaic systems with hydrogen production for electrolysis offers a flexible approach to generate hydrogen directly from solar energy. This method simplifies the hydrogen production process and ensures high purity for diverse applications. Water electrolysis technologies like alkaline, proton exchange membrane, solid oxide, and anion exchange membrane electrolysis are key in converting electrical energy from solar sources into hydrogen efficiently. The article highlights the classification of photovoltaic hydrogen production systems as off-grid and grid-connected, each offering distinct advantages in terms of flexibility and interaction with the power grid. Overall, the integration of hydrogen with photovoltaic power generation presents a promising solution to enhance grid stability and promote renewable energy development.