轨道车辆空调变频装置中电解电容器的应用研究

Selection and verification of electrolytic capacitor in electronic power conversion device

轨道车辆空调变频装置利用三相桥式整流电路将交流电变换成直流电给变频器供电,但是这种直流电压电流中含有频率为电源频率六倍的纹波,变频器也会产生纹波电压和纹波电流,并反过来影响直流电压和电流的品质,为了保证变频装置中逆变电路能够获得高质量的直流电压和电流,必须对整流后的直流电压和电流进行滤波,以减少电压和电流的脉动。

The frequency conversion device of the rail vehicle air conditioning uses the three-phase bridge rectifier to convert the AC to the DC power supply,but the DC voltage current contains the ripple of six times the frequency of the power supply. The frequency converter will also produce ripple voltage and ripple current,and in turn affect the quality of the DC voltage and current,in order to protect the DC voltage and current. In the inverter,the inverter circuit can obtain high quality DC voltage and current. It is necessary to filter the DC voltage and current after rectification so as to reduce the voltage and current pulsation.