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Intermittent power generation of renewable energy power generation system is the active reason affecting the stability of power grid, and adjusting the load imbalance between power generation and power supply through hydrogen production unit is the main means to reduce the impact of natural conditions and ensure continuous and stable power supply. In this paper, the simulation model of permanent magnet direct drive fan system for hydrogen production load is established, and the permanent magnet direct drive wind power generation unit is used to supply power to hydrogen production load to achieve the effect of stable output power.

The key to reduce the concentration of CO2 in atmosphere by using the photocatalytic reduction method lies in the development of low-cost, stable, and environmentally friendly photocatalysts. Given that g-C3N4 has the advantages of non-toxic, no metal elements, narrow band gap, good thermal stability and so on, analysis shows that this is a very potential photocatalyst. However, at present, the photocatalytic efficiency of pure g-C3N4 is limited by small specific surface area, low visible-light utilization efficiency and high recombination rate of photogenerated charge carriers. In this review, we report the methods for improving photoactivity of the g-C3N4, for instance, loading precious metal cocatalysts, earth-abundant metal cocatalysts and non-metallic cocatalysts. Finally, the issues that should be paid attention to when further studying the photoreactivity of g-C3N4 and its future research directions are discussed.