摘要
本文基于LCL滤波的逆变器侧电流反馈结构,建立了连续域的电流内环控制模型,分析了电网电压畸变对并网电流的影响,进而提出了电网电压比例前馈控制方法。通过比较两种不同线电压合成相电压方式下的零序分量幅值,分析了基于电压前馈补偿中的零序分量对三相电流波形的畸变过程,实验结果验证了方法的正确性。
This paper presents the inner current loop control model for the grid-connected inverter with LCL filter,which adopts the inverter-side current as feedback parameter.Since the grid current is sensitive to the grid voltage distortion,the proportion of the grid voltage feedforward was proposed to overcome its shortcomings.It investigates the amplitude of zero-sequence component in two different ways converting line voltage into phase voltage.The distortion process of the three-phase grid current caused by the zero-sequence component in the grid voltage feedforward compensation is analyzed.Experimental results verify the presented analysis.
出处
《变频器世界》
2015年第6期39-41,共3页
The World of Inverters
关键词
LCL滤波
电网电压畸变
比例前馈
零序分量
LCL filter
Grid voltage distortion
Proportion feedforward
Zero-sequence component
