Mixed Running Simulation Of AC-DC Locomotive And AC-DC-AC Locomotive

With the rapid development of electrified railways, Electric locomotive load has become one of the main harmonic source in power system., which is paid more and more attention As a result, it is necessary to carry out the harmonic characteristics research of locomotive, in order to control the electrification of the railway harmonic reasonably and easily.This article describes main types of our existing AC-DC locomotives and AC-DC-AC locomotives, study the harmonics current of AC-DC electric locomotive and AC-DC-AC electric locomotive. SS4 locomotive was chosen as the AC-DC locomotives on behalf of models, detailed analysis on the working principle and control principle of the main circuit, establishing each work process mathematical model of the main circuit. CRH2 locomotive was chosen as AC-DC-AC electric locomotives on behalf of models, detailed analysis on structure and working principle of the CRH2 AC-DC-AC electric locomotive, focusing on the three-level four quadrant converter main circuit operating principle and control strategy. Summed up load current harmonic characteristics of the AC-DC electric locomotive and AC-DC-AC electric locomotive, introduced the harmonic current superposition theory on traction load.In this paper, the simulation models of SS4 AC-DC electric locomotives and CRH2 AC-DC-AC electric locomotive were established using Matlab/simulink software. The simulation model was simulated in a variety of conditions, through the analysis of simulation results obtained each of the two locomotives Harmonic characteristics. A AC-DC locomotive with one AC-DC-AC locomotives simulation model of hybrid running also was established The AC-DC locomotives stable operation, the AC-DC-AC locomotives run in different conditions, running the simulation model, analyzed the harmonic characteristics of the total current of feeder.Besides it comprises and analyzes simulation current harmonic and measured harmonic current. of CRH2 locomotive when it is traction condition., both of them are similar,, which proved the simulation model is accurate and reliable.