中文摘要：

为提高多脉波整流器的谐波抑制能力和功率密度,提出了一种使用直流侧有源谐波抑制方法和星形联结自耦变压器的多脉波整流器。该整流器的两个整流桥分别与两个Boost变换器相连,通过控制Boost电路的输入电感电流使整流器输入电流近似为正弦波;使用星形联结自耦变压器作为移相变压器,该变压器绕组结构交互联结,可显著降低变压器的容量,提高系统的功率密度。计算了使整流器输入电流为正弦波时的Boost变换器电感电流理论波形,并给出了可实现的电感电流波形,进一步分析了直流侧谐波抑制方法对星形联结自耦变压器容量的影响。仿真及实验结果表明,该整流器可有效抑制输入电流谐波,且具有较高的功率密度。

英文摘要：

In order to improve the ability of harmonic reduction and power density,this paper proposes a multipulse rectifier based on harmonic reduction technology at DC link and star-connected autotransformer. The proposed rectifier employs two diode bridges,each followed by a Boost converter. By controlling the inductor current of Boost converter,the input line current of the proposed rectifier can be shaped as sinusoidal waveform approximately. A star-connected autotransformer is used to be phase-shift transformer and the winding of the autotransformer are interconnected,which can significantly reduce the equivalent k VA rating of the transformer and improve the power density. This paper also calculates the theoretical inductor current waveform of Boost converter when the input line current is sinusoidal,and presents the applicable current waveform. The effect of harmonic reduction method on the k VA rating of star-connected autotransformer is also analyzed. The simulated and experimental results indicate that the rectifier can restrain large harmonic contents in input current obviously and has the merits of high power density.