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This paper presents a universal fault location technique for N-terminal (N ≧ 3) transmission lines based on synchronized phasor measurement units. The development of the technique is based on two-terminal fault location technique. The proposed algorithm is different from traditional multiterminal fault location techniques. We apply two-terminal fault location technique to N-terminal transmission lines and propose a novel fault section selector/fault locator. The proposed method has a very good tolerance. The proposed approach provides an analytical solution and its computational burden is very low since it does not require iterative operations. An extensive series of simulations were conducted to verify the accuracy of the proposed algorithm. The average fault location error under various fault conditions is well below 1%. [ABSTRACT FROM AUTHOR]

A hybrid method which combines four different algorithms for low-frequency oscillation parameter estimation using wide-area measurements is presented in this paper. The first algorithm is the discrete Fourier transform which is used to start the low-frequency oscillation estimation process. The second one is the finite-impulse response (FIR) window filter which is employed in filtering unwanted components, and window correction factor is provided to eliminate the side effect of FIR window filter. The third one is the prototype algorithm which is proposed to estimate low-frequency oscillation parameters, and the last one is the least-square error method which is employed to enhance the computational accuracy by varying the window size. This hybrid method has been implemented in wide-area phasor measurements system by Java language and is under test in Taiwan's power system. Matlab/Simulink simulation and field test results are provided in the present paper. [ABSTRACT FROM AUTHOR]

Examines the protection scheme for parallel transmission lines. Effects of fault inception angles on the protection performance of electric lines; Principle of the fault detection location scheme; Impact of the scheme on power system faults.

Proposes a precise digital algorithm, called smart discrete Fourier transforms (SDFT), to estimate the frequency of a sinusoid power system with harmonics in real-time. Prevention of errors when frequency deviates from nominal frequency; Recursive computing; Frequency estimation; Phasor measurement.

Presents information on a study which proposed methods for the computation of power system dynamic response for real-time transient stability prediction. Real-time prediction problem and dynamic model; Criteria for transient stability prediction; Conclusions.