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三相四桥臂整流器的单周期控制

, PP. 121-129

Keywords: 三相四桥臂,整流器,单周期控制,双边沿调制

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Abstract:

三相电压型PWM整流器可以减小输入电流谐波含量,提高系统功率因数。在一些需要采用3P4W连接方式的场合里,三相四桥臂整流电路是常见的3P4W系统拓扑中的一种。PFC电路的单周期控制因其控制简单,无需乘法器及采样输入电压得到广泛研究。此外,单周期控制方案在不同电路拓扑中的扩展应用是其重要研究方向之一。本文推导了三相四桥臂整流器的单周期控制理论依据,分析了采用传统的单边沿脉宽调制方案的整流器工作模态以及对输入电流的影响,揭示了在传统的单边沿脉宽调制方式下,整流器输入电流含有较大幅值的直流分量且该直流分量与整流器的开关周期成正比,与输入滤波电感成反比。提出采用关于x轴对称的双边沿脉宽调制方案,新的控制方法可以有效的抑制单周期控制的三相四桥臂整流器输入电流直流分量,从而大幅改善输入电流波形质量。系统仿真与实验验证了理论分析的正确性。

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