【作者】 郭东；

【导师】 何正友；

【作者基本信息】 西南交通大学 ， 电力系统及其自动化， 2008， 硕士

【摘要】 采用地面电阻吸收过剩的再生能量不但能有效地防止再生失效,而且能够避免车辆重量增加和地铁隧道内温度升高的缺点。安置在地面的电阻制动装置,是牵引供电系统的重要组成部分,因此在进行牵引供电系统仿真计算时,不仅要考虑再生能量对牵引网的影响,还要分析地面电阻吸收多余再生能量的工况,确定其容量。所以,建立精确的模型,研究包含地面电阻制动系统的城市轨道交通牵引供电系统,是非常必要的。本文分析了城市轨道交通牵引供电系统的结构及其数学模型、再生制动的原理及剩余能量的处理方式,研究了现有仿真方法,针对其存在的不足,提出了一种考虑地面电阻制动的直流牵引供电仿真分析方法。通过建立直流母线设有电阻制动装置的牵引变电所模型,研究了再生制动能量的吸收过程,讨论了不同的地面制动电阻开启电压对再生能量的利用率和牵引网电压的影响。在该算法的基础上,利用MATLAB/SIMULINK建立交流侧电网模型,通过和M文件编写的直流侧算法进行交互,实现了城市轨道交通交直流潮流计算,并研究了直流侧母线电压的收敛特性,分析了影响牵引变电所交流侧和直流侧母线电压的因素。通过对算例仿真和结果的校验表明:升高开启电压会使变电所总的输出能量减少,提高再生能量的利用率,同时也提高了牵引网的电压;反之,降低开启电压,可限制牵引网的电压,但变电所吸收的能量也相应增多;直流侧母线与交流侧母线的电压之间存在相互影响,在进行城市轨道交通牵引供电计算时应对交直流进行联合潮流计算。本文提出的算法能够对考虑了地面电阻的直流牵引供电系统进行仿真计算。更多还原

【Abstract】 Utilizing ground braking resistor in absorbing the excess regeneration energy can not only avoid the disabled of regenerative braking, but also decrease the vehicle weight and the temperature of the tunnels. The ground braking resistors always set on the ground and become a very important part of the traction power system. Therefore, when the traction power system is simulated, the influence of regeneration energy on traction net is considered, and the ground braking resistors which absorb the excess regeneration energy are analyzed. Thus, it is necessary to establish precise model and research urban traction power system including ground braking resistors.The structure and models of traction power system are analyzed in this paper, then the principle of regeneration braking and the management of excess energy are studied. Based on the analysis of existing simulations and their short comings, an algorithm of DC traction power which concerns ground braking resistors is proposed. Through the modeling of substation with ground braking resistors in the DC bus, the absorbing process of excess energy is studied, and the effect of different start voltage on regenerative energy effective ratio and voltage of traction net are discussed.On basis of above algorithm, the AC side of traction net is modeled in MATLAB/ SIMULINK, and then the model is interacted with the algorithm of DC side which compiles by M document to carry out calculating AC-DC power flow of urban traction power system. Finally, the factors effecting on bus voltage between AC side and DC side are analyzed.The results of simulation and check show as follow. Firstly, going up start-voltage will reduce the total energy of substations output, raise both the utilization of the regeneration energy and voltage of net. Whereas, lower start-voltage can limit the voltage of net, but make more regeneration energy be absorbed by ground braking resistors. Secondly, when analyzing urban traction power system, both DC side and AC side should be considered because of the interaction between AC-DC. Finally, the algorithm proposed in this paper could not only calculate power flow of normal DC traction power system, but effectively simulate power flow when ground brake resistors are included.更多还原