High-Speed EMU Considering Regenerative Braking Condition Simulation Research

Electric traction has the characteristics of big traction force and high-speed etc, so most of modern high-speed railway is using electric traction. In recent, with the development of power electronics technology and motor control theory make the alternating current traction becoming the main form of electric traction.Regenerative braking technology is main characteristics of High-speed EMU with AC traction drive system. Regenerative braking technology has become a high-speed EMU brake trends. Regenerative braking is that the traction motor operating as a generator and the regenerative braking energy is fed back to traction power supply system. The energy can enter into the power grid through the traction transformer, supply other trains or is stored. The greatest advantage of regenerative braking is that it not only achieves the train brake, but also saves energy and reduces brake system maintenance.According to High-speed EMU principle of regenerative braking, the paper builds a high-speed EMU Matlab/Simulink simulation model. Simulation is realized in the condition of traction, regenerative braking and traction condition to regenerative braking, the simulation results show that the high-speed EMU model is correct.By negative sequence theory analysis and High-speed EMU model simulation analysis; we can get regenerative braking on the impact of power qualities. This paper is to study the impact for negative sequence and harmonic. For negative sequence, the paper analysis the influence for negative sequence under the different traction transformers and get high-speed EMU traction transformer selection method; For the harmonic, firstly, analyze AC-DC. Electric Locomotive network side harmonic current, and high-speed EMU semi-power and full-power traction network side harmonic current, as well as semi-power and full-power regenerative braking network side harmonic current. Finally, by the above analysis, cause high-speed EMU traction and regenerative braking conditions harmonic characteristics in comparison, as well as high-speed EMU and the AC-DC Electric Locomotive harmonics.characteristics in comparison.