February 2019
Intermediate
504 pages
18h 11m
English
Content preview from Dynamics and Control of Electric Transmission and Microgrids
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9Wide‐Area Measurements and Applications
9.1 Introduction
The technology of wide‐area measurement systems (WAMS) [1, 2] aims to make available high‐quality system‐wide measurements for enhanced monitoring, control, and protection applications. A key feature of this technology is the precise time synchronization of the measurements using a global positioning system (GPS). This feature also allows for the direct measurement of phase angular differences between phasors at different and distant locations in a power grid. The technology overcomes the limitations of conventional supervisory control and data acquisition (SCADA) systems.
SCADA systems bring system‐wide measurements at relatively slower rates; typically, data is refreshed once every 1–10 s. These measurements are not accurately time‐stamped, and may arrive at the control centres with large communication delays. These factors limit the accuracy and scope of decision‐support tools and reduce the situational awareness of a system operator. For the same reasons, measurements from SCADA systems cannot be used for feedback control and fast‐acting system protection schemes. WAMS is a superior technology and its advent has spurred the development of novel methods to determine the health of a power grid. Enhanced control and protection applications for improving system stability, which were not feasible earlier, are now being contemplated.
Synchronized phasor measurements were introduced in the mid‐1980s [3] and now there are several ...
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