以嵌入式系統與IEEE 1588實作微型相量量測器

Abstract

Synchronous phasor measurement units (PMUs) are data acquisition devices utilized in wide-area monitoring systems (WAMS). They are installed at selected buses, sampling three-phase voltage and three-phase current to calculate the phasor. The capability of receiving Global Positioning System (GPS) signals such as time tag and 1- pulse-per-second signal synchronizes phasor data collected all over the power grid. Synchrophasors in real-time applications are used to monitor the status of the power system so as to, when fault occurs, enable operators to take proper measures as soon as possible. In non-real-time applications, researchers analyze these data to find the cause of the event in the hope of preventing similar events from reoccurring. Nevertheless, if failing to receive correct GPS signals in any case, PMUs are not able to be synchronized, and the acquired data are rendered valueless. Moreover, equip every PMU with GPS signal receiver will raise the cost. Hence, this research uses IEEE 1588 to achieve synchronization with cheaper computer network system, and has higher reliability than the ones depending on GPS systems.