应用于轨道交通中24脉波自耦变压整流器的仿真研究

摘要

整流器在轨道交通中应用非常普遍,但是整流器件的强非线性会使其对电网注入大量谐波.为了减少谐波电流对电力系统产生的影响,提出一种新型24脉波整流方式来抑制谐波.分析了多脉波整流技术的谐波抑制原理、自耦变压器的结构和等效容量,网侧输入电流几个方面的内容.得出自耦变压器网侧输入电流具有良好的波形质量,其等效容量远小于输出功率的特点.最后利用电磁暂态仿真软件PSCAD/EMTDC搭建了该24脉波整流电路在轨道交通中的仿真模型.仿真结果验证了该模型应用于轨道交通中的适用性.%The rectifier is widely used in rail transit, but the strongly nonlinear of the rectifier device makes it become one of the main harmonic source of power grid.In order to reduce the interference of harmonic current in power system, we put forward a new kind of 24-pulse commutation method to suppress harmonic wave.We analyze four aspects of this method, such as the principle of multi-pulse rectifier harmonic suppression technology, the structure and equivalent capacity of auto-transformer and network side input current.We draw a conclusion that the input current of auto-transformer has good waveform and the advantage of that its equivalent capacity is far less than the output power.Finally, we build a 24-pulse rectifier circuit simulation model of rail transit through using thesimulation software PSCAD/EMTDC of electromagnetic transient.The simulation results verify the validity of the model used in rail transit.