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A frequency estimation method with good resistance to harmonics is proposed in this paper. In the proposed method, a new sequence is constructed using the summation of the samples in the original sampling sequence. The amplitude ratio of the new sequence and the original sequence is used to calculate the fundamental frequency deviation. The effects of negative fundamental component, harmonics, and...
Electrified railway traction loads were affected by many factors, so traction feeder currents has the characteristic of random time-varying. This paper analyzes distribution characteristic of traction feeder currents based on a great deal of measured data. Lognormal distribution function was used to fit the probability density of the feeders. Error analysis shows that this method is feasible. Samples...
Probability density function for feeder current of traction substation is fitted by using beta function through the theory of stochastic process and method of numerical analysis, and the distribution characteristic of feeder current is generalized and analyzed based on a great deal recorded feeder current data. The feeder current sample, which will supply more detailed information for the procedure...
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