Effects Of Electric Railway On Power Quality

With the progress of modern science and technology and the rapid development of the national economy, the issue of power quality and supply more and more concerned about the users, which are most seriously affected by harmonics, or whether it is the electricity sector users, caused by harmonic the loss is immeasurable. On the other hand, unbalanced three-phase power quality to increase the power supply sector and the unnecessary loss of customers, increase their burden. In this paper, make rectifier, single-phase large fluctuations in load a simulation model of electric locomotive, and give the suppression measures.The paper introduces the basic concepts of power quality and the various components of the electric railway. There has a brief study of the status at home and abroad, and then combined with the current electric locomotive made by the research methods Shao-shan 9 parts of electric locomotive rectifier simulation model, On the current input Fourier transform; On this basis for the electrification of railway lines connecting points of the public current Fourier transform, reached the rate of harmonic current distortion and harmonic content, and relevant norms of the country compared to reach a conclusion. In addition, the proposed increase in electric locomotive passive filter devices, filter harmonics generated by rectifier devices,application of the relevant MATLAB analysis module, respectively, electric locomotive and public input current harmonic connection point, With no current harmonic filtering devices, compared to the situation, one can see significantly lower harmonic content, high-order harmonic generation has been completely filtered to GB standard.Finally, the calculation of single units of electric locomotives to inhibit the rate of three-phase imbalance measures to significantly reduce the imbalance ofpower grid system.