What challenges does large-scale intermittent renewable energy access bring to traditional power grid?

I don't know what you mean by large-scale intermittent renewable energy. As far as I know, renewable energy includes solar energy, water power, wind power, biomass energy, wave energy, tidal energy, ocean temperature difference energy and so on. The ocean temperature difference energy is relatively stable, and the hydropower generation in the form of dam is also relatively stable when generating electricity. Other energy types will fluctuate, which is probably what you said.

These renewable energy sources are just a form of energy, which will eventually be used to generate electricity. For the traditional power grid, it is all electricity. Compared with traditional thermal power plants, they are intermittent and unstable, and are easy to produce harmonics and severe load fluctuations. Therefore, it is generally necessary to equip a large energy storage system for voltage regulation, and pure hand knocking is hoped to be adopted.