PWM变流器在城市轨道交通再生制动中的应用

Application of PWM Converter in Urban Mass Transit Regenerative Brake

城市轨道交通机车制动时产生的制动能量,除一部分被正在取流的机车利用外,剩余的则会导致直流牵引网压升高。现阶段,由于普遍采用的是电阻制动,剩余的能量全部由电阻消耗,这样不仅造成了再生制动能量的利用率低,还会增加散热通风系统的负担。本文分析了将PWM变流器应用于城市轨道交通再生制动能量吸收,建立了系统数学模型,并在Matlab/Simulink环境下搭建了系统仿真模型。仿真结果验证了方案的可行性,并且具有功率因素较高、系统动态响应快和直流侧电压稳定性好等特点。

In Urban Mass Transit, when the locomotive brakes, the locomotive motor produces braking energy. This part of the energy is used by some locomotives, the remains can make the DC traction network＇s voltage rise. At this stage, the resistance braking is used, most of the remaining energy is consumed by the resistance, which not only results in low utilization of regenerative braking energy, but also increases the burden of cooling ventilation system. This paper analyses using the PWM converter to absore the energy produced by the braking locomotive,establishes the system＇s mathematical model. And then, in theMatlab/Simulink environment established the simulation modesl. The simulation results indicate that the algorithm is available,also has high power factor, low harmonic content, fast dynamic response and stable the the network voltage characteristics.