System requirements for dynamic performance and response of generating units

Starting from a discussion of the fundamental characteristics of modern interconnected power systems, this paper goes on to categorize requirements for dynamic performance and response imposed on the aggregate generation which supplies the system. Both normal and abnormal operating modes are considered. The performance and response requirements are shown to stem from basic needs to maintain voltage, frequency, time, and continuity of service as well as the secondary requirements of maintaining operating economies and controlling inadvertent interchange between neighboring power systems. Typical data taken from operating records are used to illustrate and quantify several of the response requirements.