Probability Distribution Model Of Electrified Railway's Traction Load

As the electrified railways rapid development and the same time new electric railways will produce many adverse impact on the main sequence, negative and harmonics pollution to quality of the power system. Contrast with a three-phase power system, the particularity of single-phase exchange electrified railway system reflect its specific structure and every line in the feeders (phase) of independence and random wave properties, therefore, based on this unfolding study the negative three technical problems of reactive power, needle sequence and harmonic.Based on mass traction's load test data, and gained traction's load probability density function by using numerical definition and theoretical distribution fitting method. Because only a few theoretical distribution parameters determined could generate its probability density, applied conveniently, in contrast to the three theory fitting results of Distribution model with Beta Distribution, Lognormal Distribution and Rayleigh Distribution, choose the Beta Distribution which have best fitting effec produced probability density function of traction's load, and gives the conditions of beta function can accurate fitting load. After random sampling by current transform array verify the validity of this method.Due to the limitations of Beta Distribution function fitting, in this paper using a numerical well-defined formalism produced traction's load probability density and probability distribution model, and found the boundary conditions of the new electrified railway traction's load distribution and existing electrified railway traction's load distribution by classification of the characteristic parameters, forecasts the new traction substation feeder current load data. Similarly transform to traction transformer primary side and proof the validity of this method. To new SuiYU line for example, combined with the power line, forecasts ChongQing grid lines negative sequence influence with the parameters of grid.Data from the perspective of measured data, studies the YNd11 and three phase-two phase balance type wiring traction substation of negative sequence distribution charcteristics and traction transformer capacity distribution characteristics, and draws a conclusion.