输入电压不平衡时三相PFC整流器改进单周期控制策略研究

发布时间：2019-05-09 13:00

【摘要】：三相PFC变换器的单周期控制因其控制简单,无需乘法器及采样输入电压受到广泛重视。当输入不平衡时,三相PFC整流器直流侧输出电压将产生两倍于输入电源频率的脉动,该脉动信号经过传统单周期控制环路作用最终导致变换器输入电流产生较大幅值的三次谐波分量,影响输入电流品质。文章通过详细分析输入不平衡时,单周期控制的三相PFC整流器输入输出特性,提出在传统单周期控制策略中引入谐振控制器,从而可以有效抑制输入不平衡引起的单周期控制的三相PFC整流器输入电流中的三次谐波分量,进而大大改善输入电流品质。本文给出了谐振控制器的设计方法,建立了新的控制策略下的系统传递函数并分析了满足系统稳定性要求的设计准则。最后通过仿真与实验验证了所提出的改进单周期控制策略对于输入不平衡时,改善三相PFC输入电流品质的有效性。
[Abstract]:The single-cycle control of three-phase PFC converter has been paid more and more attention because of its simple control and no multiplier and sampling input voltage. When the input is unbalanced, the output voltage on the DC side of the three-phase PFC rectifier will fluctuate twice as much as the frequency of the input power supply. Through the action of the traditional single-cycle control loop, the pulsating signal finally leads to a large amplitude of the third harmonic component of the input current of the converter, which affects the quality of the input current. In this paper, the input and output characteristics of three-phase PFC rectifier controlled by single cycle are analyzed in detail when the input is unbalanced, and a resonant controller is proposed to introduce the resonant controller into the traditional single-cycle control strategy. Thus, the third harmonic component in the input current of the single-cycle controlled three-phase PFC rectifier caused by the input imbalance can be effectively suppressed, and the quality of the input current can be greatly improved. In this paper, the design method of resonance controller is given, the system transfer function under the new control strategy is established, and the design criteria to meet the requirements of system stability are analyzed. Finally, the effectiveness of the proposed improved single-cycle control strategy for improving the input current quality of three-phase PFC is verified by simulation and experiments.
【作者单位】：南京航空航天大学自动化学院;
【基金】：江苏省新能源发电与电能变换重点实验室开放研究基金光宝电力电子技术科研基金和江苏省基础研究计划(BK20131360)资助项目
【分类号】：TM461

【相似文献】