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数字控制的单周期PFC整流器的设计与分析

DOI: 10.13334/j.0258-8013.pcsee.2014.21.004, PP. 3423-3431

Keywords: 功率因数校正,单周期控制,三相整流器,数字实现

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Abstract:

单周期控制作为一种简单有效的非线性控制方法,广泛应用于高功率因数整流器。该文研究一种基于单周期控制的三相三开关功率因数校正(powerfactorcorrection,PFC)整流器,基于状态空间平均法研究了三相整流器的控制规律,针对单周期控制下输入电流的奇次谐波问题,提出一种改进的脉冲宽度调制(pulsewidthmodulation,PWM)方法,通过改变比较器的输入调制信号,消除了传统单周期控制方法所带来的输入平均电流中的奇次谐波,并进行了稳定性分析。最后,提出一种数字控制的PFC实现方案。实验结果表明,该文所提出的控制方法使三相整流器输入电流的谐波含量明显降低,功率因数和电能质量得到提高,且有良好的动态响应性能。

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