中文摘要：

为提高多脉波整流器的直流侧无源谐波抑制能力,研究了基于两抽头变换器的24脉波整流器直流侧谐波抑制机理。根据抽头变换器的结构及安匝平衡原理,分析了抽头变换器的功能及工作模式,研究了抽头变换器的工作模式对整流桥输出电流、整流器输入电流及负载电压的影响,给出了抽头变换器变比的理论最优值。理论分析及实验结果表明,抽头变换器的端电压会使其所接的两个二极管交替导通,对整流桥输出电流进行调制,进而产生环流,该环流流经交流侧时会抵消原输入电流中的12k±1（k为奇数）次谐波。另外,抽头变换器所接的两个二极管的交替导通,会在负载上产生附加电压,附加电压的存在可以显著降低负载电压的纹波系数。相应的实验结果验证了理论分析的正确性。

英文摘要：

In order to improve the ability of harmonic reduction at DC link of multi-pulse rectifier（ MPR）,the harmonic reduction mechanism at DC link of 24-pulse rectifier with double-tapped interphase reactor（ IPR） was analyzed. According to the winding configuration of double-tapped IPR and Ampere-Turn balance,the function and operation mode of double-tapped IPR were analyzed. The effect of operation mode on output currents of the two bridge rectifiers,input current of rectifiers,load voltage were also analyzed,and the theoretical value of turn ratio of IPR was calculated. Theoretical analysis and experimental results show that the conduction in turn of the two diodes connected with IPR will produce a circulating current to modulate the output currents of the bridge rectifiers. When the circulating current flows through the input mains,it reduces the（ 12 k ± 1）th（ k is odd number） harmonics. In addition,conduction in turn of the two diodes produces an additional voltage on the load voltage,which depresses the ripple coefficient of load voltage. Experimental results validate the correctness of theoretical analysis.