【作者】 曹承洁；

【导师】 李晓帆；

【作者基本信息】 华中科技大学 ， 电力电子与电力传动， 2005， 硕士

【摘要】 当今流行的大多数开关电源,其前置输入部分多采用二极管整流的不控整流环节。由于其本身的非线性特性,会使网侧输入电流严重畸变,谐波含量多,降低了设备的电磁兼容性能,给电网及其它用电设备带来危害。随着开关电源设备功率的增大,这种不控整流装置所产生的谐波更加严重。针对大功率场合下的三相整流电路,通常使用多相整流的方法消除网侧输入电流的某些特定次数的谐波,降低输入电流中的谐波含量,改善波形质量。本文首先介绍了目前已有的几种典型的多相整流方案,以自耦变压器运用于多相整流电路的技术性突破为重点,对其分别进行了详细的理论分析和研究。并在此基础上,总结出多相整流电路的相数和消除谐波次数的规律性关系。接着本文提出了一种基于自耦变压器的24 相整流电路。该电路使用较小容量的自耦变压器,能够消除网侧电流中的5、7、11、13、17、19 次等谐波,与其它的多相整流电路相比,大大降低了输入电流中的谐波含量,使网侧输入电流具有更好的波形质量。本文经过详尽的数学推导,分别从自耦变压器的结构,输入电流,平衡电抗器,自耦变压器的等效容量四个方面,对该电路进行了全面的分析和理论研究。并且给出了电路在Synopsys Saber 软件上进行仿真的仿真波形,验证了该电路的合理性。最后,本文设计了具体的实验装置,介绍了自耦变压器和平衡电抗器的设计参数,对所提出的电路进行了实验,给出了实测波形和谐波分析数据。本文通过理论分析、仿真研究和实验验证,证实了这种基于自耦变压器的24 相整流电路的合理性、可行性。更多还原

【Abstract】 As the non-linear nature of the uncontrolled rectifier, which has been widely used in the power supply equipments, the input line currents have significant harmonics and high total harmonic distortion (THD). When the power of the equipments is higher, the harmonics in the utility interface are larger. At the high power applications, the multi-pulse rectifier has been used to eliminate the certain harmonics, shape the input current, and reduce the harmonics pollution to the utility. The schemes of the present typical multi-rectifiers are given with the detailed conceptions and analysis, on emphasis of the use of autotransformer. The relationship between the number of the rectifier pulse and the order of the harmonics is concluded. The 24-pulse rectifier based on autotransformer scheme is proposed in the paper. This circuit is verified in rigorous theory and analyzed in details in the aspects of autotransformer connection, input current, interphase reactors, and KVA rating of the autotransformer. Proved in mathematics, the proposed circuit can eliminate the 5th,7th,11th,13th,17th,19th etc harmonics, and reduce the THD greatly. The simulated waveforms are given on the software Synopsys Saber. Then an experimental installation is given .The parameters of the autotransformer and the interphase reactors are designed. Finally, the experimental waveforms and results are given. In conclusion, the correctness and feasibility of the proposed 24-pulse rectifier based on autotransformer circuit is verified by the mathematical analysis, simulation research and experiments validation.更多还原