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单周控制下三相四线制PFC整流器输出电压不均匀原因分析及均压数字控制方法

, PP. 143-150

Keywords: 三相四线制,单周控制,均压控制,数字控制

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Abstract:

为解决三相四线制PFC整流器直流侧两输出电容电压不平衡对后级变换器带来的不利影响,本文重点推导出了电压不均衡的原因,在传统的单周控制基础上提出一种改进的数字控制方法用来解决输出电容电压不平衡问题。对输出端两电容分别应用霍尔器件进行采样,将采样值输入到DSP中,由数字控制芯片进行处理,将处理后的均压结果加入到单周控制环节中,实现输出电容的均压控制。最后在数字控制平台上搭建了3kV·A原理样机,通过Matlab仿真和实验验证了改进的控制策略的正确性和可行性,表明系统能满足稳定性与快速跟踪性要求。

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