摘要
由于LCL滤波器对电流高频谐波有较好的滤除效果,被越来越多地用于逆变器并网。针对LCL型并网逆变器固有的控制谐振和并网电流低频谐波含量高的问题,提出一种基于有源阻尼的多谐振比例谐振(PR)控制器,在保证稳定性的前提下,实现对输出电流中特定频率谐波的抑制。理论分析、仿真和实验结果证明所提控制算法能在保证并网逆变器稳定运行的同时,明显降低输出电流中的低频谐波含量,达到提高并网逆变器输出电流电能质量的目的。
LCL filter is widely adopted by grid connected inverters because of its ability to reduce harmonics in high frequency.A multi-resonant proportional resonant regulator based on active damping is designed to solve the resonance problem of LCL filters and to eliminate harmonics of output current.Theoretical analysis, simulation and experimental results prove that the control strategy has significant advantage in reducing the total harmonic distortion of output current, and it can realize the target of increasing the power quality of grid-connected output current.
出处
《电力电子技术》
CSCD
北大核心
2016年第9期67-70,共4页
Power Electronics
关键词
并网逆变器
有源阻尼
比例谐振控制
电流谐波
grid-connected inverter
active damping
proportional resonant control
current harmonics
