How to realize frequency modulation of power grid? There are several ways.

Simply put, it is to change the power output of the system. When the system frequency is too high, reduce the power output, otherwise increase the output. The power dispatching department will predict the power load in advance, assign power generation tasks to each power plant, and then adjust it in time according to the daily load curve. For the impact load, it mainly depends on the automatic adjustment of the governor of the generator prime mover, which will automatically track the system frequency and automatically adjust the generator output in time according to the change of the system load.

Due to the fast start-up speed and load adjustment of hydropower plants, large and medium-sized hydropower plants are generally responsible for frequency modulation in the system.