【摘要】 目前LCL滤波的并网逆变器常采用d,q坐标系下的PI控制,由于LCL滤波器存在一个谐振频率,若控制参数设计不合理,易造成系统不稳定,从而引起设备损坏。针对系统稳定性问题,提出一种基于z域双参数根轨迹稳定性分析的PI参数设计方法,并通过样机测试验证了该方法的有效性。更多还原

【Abstract】 Nowadays inverter with LCL filter are usually controlled by PI in d,q coordinate.As the existence of resonant frequency of LCL filter,systems may be unstable and the device may be destroied if the control parameters is not designed rationally.Aimming at the stability of system,a PI parameters design method is proposed based on stability analysis with z domain root locus of two parameters.The validity of the proposed method are verified by prototype test.更多还原