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Extended data:

Frequency modulation mode

Primary frequency modulation

Primary frequency regulation refers to the inherent ability of frequency characteristics of speed regulation system of generator set to automatically adjust frequency with frequency change. Its characteristic is fast frequency adjustment, but the adjustment amount varies with different generator sets, and the adjustment amount is limited, which is difficult for the dispatcher on duty to control.

Secondary frequency modulation

Secondary frequency modulation refers to the frequency modulation method used when the load or power output of the power system changes greatly and the frequency cannot be restored to the specified range by primary frequency modulation. Secondary frequency modulation is divided into manual frequency modulation and automatic frequency modulation:

Manual frequency modulation: In the frequency modulation factory, the operator adjusts the output of the generator according to the change of the system frequency to keep the frequency within the specified range. Manual frequency modulation is characterized by slow response speed, which often fails to meet the requirements of frequency quality when the adjustment range is wide, and at the same time, the personnel on duty operate frequently and have high labor intensity.

Automatic frequency modulation: this is a frequency modulation method adopted by modern power system. Automatic frequency modulation is to automatically increase or decrease the power output of the generator with the change of system frequency through automatic devices installed in power plants and dispatching centers, so as to keep the system frequency fluctuating in a small range. Automatic frequency modulation is an integral part of power system dispatching automation, which has comprehensive functions such as frequency modulation, power control of inter-system tie line exchange, and economic dispatching.

China Radio Network-China People's Broadcasting Station Program Frequency Table