一种基于全波平衡电抗器的双反星形12脉波整流器

为了有效抑制常规双反星形整流器的输入电流谐波和输出电压脉动,提出一种基于全波平衡电抗器的双反星形12脉波整流器。所提出的12脉波整流器由常规的双反星形整流器和全波平衡电抗器组成。全波平衡电抗器中含有带副边绕组的平衡电抗器和辅助单相全波整流器,辅助单相全波整流器通过从平衡电抗器的副边绕组提取方波电流来增加2个三相半波整流桥的输出电流和电压模态,然后依据交直流两侧电流和直流侧电压的关系,将双反星形整流器的脉波数从6倍增到12,显著抑制了输入电流谐波和输出电压脉动。因流过辅助单相全波整流器的电流仅为负载电流的6.69%,相较于现有基于抽头平衡电抗器的脉波倍增方法,所提方法除具备电路结构简单可靠、易于实现和成本低廉等优点外,还具有更小的附加导通损耗,更适用于低压大功率工业场合。研制了一台功率为1.1 kW的实验样机,验证了理论分析的正确性和该方法的有效性。

Double-star 12-pulse rectifier based on full-wave inter-phase reactor

In order to effectively suppress the input current harmonic and output voltage ripple of the conventional double-star rectifier, the double-star 12-pulse rectifier based on full-wave inter-phase reactor is proposed, which consists of conventional double-star rectifier and full-wave inter-phase reactor. The full-wave inter-phase reactor includes inter-phase reactor with secondary winding and auxiliary single-phase full-wave rectifier. The auxiliary single-phase full-wave rectifier increases the output current and voltage mode of the two three-phase half-wave rectifier bridges by extracting the square wave current from the secondary win-ding of the inter-phase reactor. Then, according to the relationship between the current of both AC and DC sides and the voltage of DC side, the pulse number of double-star rectifier is extended from 6 to 12, which significantly suppresses the input current harmonics and the output voltage ripple. The current flowing through the auxiliary single-phase full-wave rectifier is only 6.69 % of the load current. Compared with the existing pulse multiplication method based on tapped inter-phase reactor, the proposed method has lower conduction loss and is more suitable for low voltage and high power industrial applications, as well as the advantages of simple and reliable circuit structure, easy implementation and low cost. An experimental prototype with power of 1.1 kW is developed to verify the correctness of theoretical analysis and the effectiveness of the proposed method.