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三相PWM变换器的鲁棒变结构控制

DOI: 10.16383/j.aas.2015.c140421, PP. 601-610

Keywords: 功率因数校正,PWM整流器,变结构控制,鲁棒性

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Abstract:

?分析了三相脉冲宽度调制(Pulsewidthmodulation,PWM)功率因数校正(Powerfactorcorrection,PFC)变换器的工作原理和数学模型.针对现有控制方法在参数不确定及参数变化时性能变差的问题,提出采用鲁棒变结构控制减小系统参数不确定性的影响,同时采用渐缩滑动边界的方法减小了控制量的颤振.仿真及实验结果表明,与传统PI控制和反馈线性化方法相比,本文方法不仅在标称参数时具有较好的动静态性能,而且在系统参数发生变化时,具有更强的鲁棒性.

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