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This paper presents a new procedure for tracking the source location of voltage sags in a power system. In the proposed method, the power quality meter locations are firstly determined based on the sensitivity of the system fault current level to the faulted voltage. Then, a current deviation index for representing the variation of each branch current before and after the disturbance is calculated...
Fast Fourier transform (FFT) has been widely used for the signal processing because of its computational efficiency. Most power quality meters and digital relays adopt FFT-based algorithm to characterize harmonics of the measured signals. A direct application of FFT-based algorithms may lead to inaccurate results, if the system fundamental frequency varies or interharmonics are present. This paper...
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