【作者】 陈鹏；

【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， 2006， 硕士

【摘要】 AC/DC变换器是电力电子装置中最为常用的一种变换器,为了减小其对电网的污染,提高功率因数,功率因数校正技术正得到广泛的运用。目前,单相功率因数校正技术已比较成熟,但三相功率因数校正技术仍处于需进一步研究开发阶段。高频PWM整流可以有效调节输出电压,使输入电流近似于正弦波。但其成本高,且开关损耗大,效率不高。在中、高功率场合下采用,通常采用多脉波二极管整流技术可以降低设备成本,提高效率,并且不会产生额外的EMI。传统的12脉波整流方式可以在输入电流中消除5、7次谐波,但其输入电流的THD为11.3%,谐波污染仍较大。本文研究了一种简单的通过辅助电路回馈部分能量的12脉波整流电路,有效减小了输入电流谐波含量,提高功率因数。辅助电路由单相电压逆变器构成,产生交流辅助电压通过变压器耦合到主电路上,从而改善电流波形。但是该电路不能调节输出电压,为了解决这个问题,本文研究了一种基于Boost电路的12脉波整流电路,可以充分运用较为成熟的单相PFC技术。该电路采用连续电流控制方式,控制简单,采用软开关技术有效提高了效率。本文通过理论分析、仿真研究和实验验证,证实了该电路的合理性和可靠性。与传统的12脉波整流电路相比,以较小的改动改进了PFC的效果,具有一定的实用性。更多还原

【Abstract】 AC/DC converter is the most widely used converter in the power system. Power factor correction technology is widely used to reduce the harmonic pollution of power supply and improve the power factor. At present, the single-phase PFC is already developed, but three-phase PFC is still in the stage of library works.High-frequency PWM rectifier can regulate the output voltage with sinusoidal input current. But this method has practical disadvantages since it is not efficient. In high power conditions, the multi-pulse rectifier has been used widely. This approach has several advantages such high efficiency and no additional EMI. Traditional twelve-pulse rectifier can eliminate the 5th,7th harmonics. However, input current THD is 11.3% in this method.In this paper, a 12-pulse diode rectifier with an auxiliary voltage circuit is proposed. The purpose is to obtain a 12-pulse diode rectifier whose harmonic contents are reduced a lot. The auxiliary voltage circuit consists of two single-phase voltage converters which can be controlled conveniently. The auxiliary voltage reaches to the main circuit through transformer to improve the wave form of the input current. However, this approach can’t regulate the output. In order to solve this problem, this paper analyze a wide input rang active multi-pulse rectifier with Boost modules. Rich single-phase technology is used in the method. The circuit adopts the continuous current method, and adopts soft switch technology to rise efficiency effectively.In conclusion, the correctness and feasibility of the circuit based on Boost is verified by the mathematical analysis, simulation research and experiments validation.更多还原