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The Wavelet Transform has been widely used to process signals in engineering and sciences areas. This acceptance is rooted on its proven capability to analyze fast transients signals which is difficult to perform with the FFT. In the area of electrical engineering, a number of publications have been presented about the analysis of phenomena in electrical grid at medium and high voltage levels. Some solutions have focused on the power quality (ChiaHungC Tse, 2006), short-term load forecasting (Chen, 2010) and protection of power systems (KashyapS Ning&Gao, 2009). However, there are few contributions in the open literature focusing in using WT for implementing relaying protection algorithms in power grids with presence of FACTS. The Thyristor Controlled Series Capacitor (TCSC), the Universal Power Flow Controller (UPFC), the Static Synchronous Series Compensator (SSSC), and the Statcom are some of the power controllers developed under the umbrella name of “Flexible AC Transmission Systems” (FACTS). These devices play a key role in nowadays electrical networks because they have the capability of improving the operation and control of power networks (power transfer, transient stability among others characteristics). Collateral to their many strong points, the FACTS controllers also have secondary effects on the grid that should be taken into account for engineering the next generation of protection schemes.

intech ebooks

Discrete Wavelet Transform Application to the Protection of Electrical Power System: A Solution Approach for Detecting and Locating Faults in FACTS Environment