电铁供电系统的有源电力滤波器

The Active Power Filter Used in the Electrified Railway Supply System

在牵引变电所的一次侧并联接入有源电力滤波器,用瞬时无功功率理论检测法检测待补偿电流的指令值,采用空间矢量脉宽调制控制方法,使逆变器产生出待补偿电流,来抵消因单相交流电气化铁道(简称电铁)牵引负荷的使用给三相电力系统带来的谐波电流、无功电流及三相不平衡电流。因有源电力滤波器并联接入系统,所以这些不利电流只在牵引系统和有源电力滤波器中流动,不会进入三相电力系统,从而保证了三相电力系统不受牵引系统的影响而保持电网电流波形纯正弦。

The APF paralleled with the primary side of traction substation offsets harmonies current, reactive current and asymmetric current going along with the using of single--phase AC traction loads in electrified railway system in order to avoid these currents into the three--phase power system. In the APF, the trigger currents are detected by means of the method based on the Instantaneous Reactive Power Theory, and on the basis of the trigger currents, the currents for compensation are obtained from the inverter under the control of SVPWM. As APF parallels with the system, all these disadvantageous currents don＇t flow into the three-- phase power system but only through the traction system and the APF. As a consequence, it can be ensured that the pure sine input current appears in the three--phase power system.