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不隔离单相光伏并网逆变器系统输入电流低频纹波抑制

, PP. 139-146

Keywords: 光伏,输入电流低频纹波,反向电流增益,平均电流控制

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Abstract:

单相光伏并网逆变器系统网侧功率时变特性导致前级直直变换器输入电流中含较大(两倍电网频率)低频纹波,影响其对光伏面板最大功率跟踪效果。本文基于反向电流增益Ai(s)(输入电流对输出电流)模型,提出一种新的方法,用于分析单相不隔离光伏并网逆变器系统中前级Boost直直变换器低频纹波特性。本文建立并推导了不同控制方式下的Boost变换器的Ai(s)模型,并在Saber软件中得到验证。指出并验证了平均电流控制方式相比电压控制方式及开环控制方式,在输入电流低频纹波抑制方面更有效,并给出相关的设计准则。仿真及实验表明了该模型的正确性及可行性。

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