本文分析了电力系统有功频率调整的特点、规律,介绍了一次调频和二次调频的作用,并说明了水电站在电力系统二次调频的重要地位。 This paper analyzes the characteristics and rules of power system active frequency adjustment, introduces the functions of primary frequency modulation and secondary frequency modulation, and illustrates the important status of hydropower station in power system secondary frequency modulation.