【摘要】 LCL滤波器正广泛应用于并网逆变器,但无阻尼时易使系统谐振,给系统的稳定性控制带来困难。在建立三相并网逆变器数学模型的基础上,采用基于d,q同步旋转坐标系的电压定向控制策略,使用被动阻尼抑制谐振。给出了被动阻尼LCL滤波器的设计方法,详细分析并比较其与单L滤波器的滤波效果,并分析了被动阻尼的选取对系统稳定性的影响,最后通过实验验证了设计。更多还原

【Abstract】 LCL filter is more and more widely used in grid-connected inverter.However,it may result in instability easily due to resonance,which makes it difficult for stability control without damping.Voltage oriented control strategy under the d,q synchronization reference frame is adopted based on the mathematical model of the three-phase gridconnected inverter using LCL filter with passive damping to inhibit the resonance.The design methods of LCL filter with passive damping are given and the characters and performances of an LCL filter compared with the L filter are investigated.At the same time,the influences of system stability with different damping are analyzed.The experimental results effectively verify the design.更多还原