Research On The Simulation And Analysis Of Electric Railway Connected To Power Grid

Electrical railway has the specialties of high conveyance, high speech, low enery consumption and low cost.Now the high speed of building electrical railway in our country, the whole length of our national electric railway will be above 50000 km length in 2020. The ratio of electrical power is above 50%. The load of amount of conveyance is 80% by electrical railway.With the development of large number of elcetical railway is put into general use, these effects on power grid along the railway lines are becoming more and more deeply. It is necessary to construct a real model and an accurate way of calculation of evaluating the affection of electrical railway.To evaluating the affection of electricalrailway in Zhejiang, this thesis deals with the study of emulation of type SS4, SS8, SS9 series electric locomotives which are largely used in our contry,and gets the results in different bridge condions. By the results this thesis also deals with their specialites.This thesis also deals with four different traction transformers:Y-d11 transformer, V-V transformer, Scott transformer and impendance matching balance tansformer, by calculating their modeling results we get the number of harmonic current, positive and negative-sequence component in the high-voltage part of four transfomers. It also anlyzes the effection on power gird and the harmonic current.On the base of simulation data, to control the harmonic effection on Zhejiang power grid by the electrical railway, a reasonable reconstruct way is put forward. The way is alterion the ration of reator in a capacitor device. The results which the alterion the ration of reator in capacitero can control the harmonic current are validated by measerment and monitoring in a power station on and off a capacitor device.At last, by the measurement of harmonce componet in a power line connected by electrical railwy in defferent conditons, the resuls is similar to the vaule of simulation.