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Automatic frequency regulation: This is the frequency regulation method used in modern power systems. Automatic frequency regulation uses automatic devices installed in power plants and dispatch centers to automatically increase or decrease the power generation output of generators as the system frequency changes.

To keep the system frequency fluctuating within a small range, automatic frequency regulation is an integral part of power system dispatching automation. It has comprehensive functions such as frequency regulation, inter-system tie line exchange power control, and economic dispatch.

Second frequency modulation:

Second frequency modulation refers to the frequency modulation method used when the power system load or power generation output changes significantly and primary frequency modulation cannot restore the frequency to the specified range. Secondary frequency modulation is divided into manual frequency modulation and automatic frequency modulation:

Manual frequency modulation: In the frequency modulation plant, the operator adjusts the generator output according to changes in system frequency to keep the frequency within the specified range. Manual frequency modulation The characteristic is that the response speed is slow. When the adjustment range is large, it often cannot meet the frequency quality requirements. At the same time, the on-duty personnel operate frequently and the labor intensity is high.