输入侧断相对多脉波整流器直流侧谐波抑制方法的影响

In order to describe the fault feature of the multi-pulse rectifier (MPR) when open phasing, the effect of the open-phasing was analyzed on the MPR when using the harmonic reduction method. To set the 24-pulse rectifier with double-tapped inter-phase reactor (IPR) and 12-pulse rectifier with active IPR as examples, the current and voltage characteristic were analyzed under normal operation and open phase, respectively. The theoretical analysis indicates that the instantaneous difference of the two bridge rectifiers' output voltages is equal to zero under open phase, and the MPR is equivalent to be two single-phase rectifiers with the equal input voltages, which cause that the double-tapped IPR and active IPR cannot generate circulating current to eliminate the harmonics in input terminals. In addition, the open phase also results in the large ripple of load voltage, which means the power quality of dc side and ac side will be worsen. The results provide the basis of analysis and real-time processing for parallel-connected MPR under open-phase.