Phasor measurement units, WAMS, and their applications in protection and control of power systems

摘要

The paper provides a short history of the phasor measurement unit（PMU） concept. The origin of PMU is traced to the work on developing computer based distance relay using symmetrical component theory. PMUs evolved from a portion of this relay architecture. The need for synchronization using global positioning system（GPS） is discussed, and the wide area measurement system（WAMS） utilizing PMU signals is described. A number of applications of this technology are discussed, and an account of WAMS activities in many countries around the world are provided.