Research purposes:The braking control system is one of the Vey techcologies for guaranteeing the running safety of high - speed EMU and an important part of the driving system of EMU. The regenerating braking is used for the high - speed EMU along with the electric air braking. Among the various braking methods, only can regenerative braking feedback the energy to the catenary. Thus it has become the first choice for the braking mode of AC traction EUM. How to realize the smooth changing - aver among the different control ways for the traction, braking, constant -speed and coasting and how td control the unity power factor of feedback are the key technologies of regenerating braking control system. In this paper, taking the CRH2 -EMU as the study object, the research is done on the key regenerating braking technologies of the EMU for providing the references to the digesting, absorbing and re - innovation of the key traction current - converting technology for the high - speed EUM.Research conclusions:(1) A constant speed controller based on double - hysteretic band adjustment is designed in order that the EMU can stably run at any speed ranging from 0 to 250km/h. (2) The simulation system can realize the energy feedback and control of the unity power factor when the EMU is in the regenerating braking slate, and the system can give the regenerative braking order again according to the characteristic curve to meet the running demand of high -speed EMU.%研究目的:制动控制是高速动车组安全运行的关键技术之一,也是动车组牵引传动系统的重要组成部分.高速动车组的制动系统采用再生制动和电气指令式空气制动相结合的方式.在所有制动方式中,再生制动是唯一一种向电网回馈能量的方式,日益成为交流传动动车组的首选制动方式.如何实现牵引、制动、恒速、惰行等不同控制方式之间的平滑切换、回馈电网的单位功率因数控制是再生制动控制系统的核心技术.本文以CRH2型动车组为研究对象,对动车组再生制动关键技术进行研究,研究成果对高速动车组牵引变流关键技术的消化、吸收、再创新具有一定参考价值.研究结论:(1)设计出一种基于双滞环调节的恒速控制器,实现动车组在0 - 250 km/h范维内任意速度下稳定运行.(2)仿真系统在动车组制动时能够实现能量的回馈和电网的单位功率因数控制,且可以按照特性曲线发出再生制动力指令,满足动车组运行要求.
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