LCL型并网逆变器的新型单电流反馈控制方案

Novel single current feedback control scheme for grid-connected inverter with LCL filters

基于有源阻尼控制机理特性,提出一种应用于LCL型并网逆变器的新型单电流闭环反馈控制策略。该控制策略将有源阻尼与谐振控制特性相结合,通过对进网电流全前馈控制,有效抑制谐振尖峰且实现基波频率处高增益。该控制策略不引入额外的传感器,结构简单、成本低、可靠性高。推导了该控制策略下系统传递函数,并给出其实现方法。建立MATLAB/Simulink仿真模型,验证了所提控制策略的可行性与有效性。

Based on the characteristics of active damping control mechanism,a novel single current closed-loop feedback control strategy for LCL grid-connected inverters is proposed in this paper. The control strategy combines active damping and resonance control,and the resonance peak is effectively suppressed and the high gain at the fundamental frequency is realized through full feed-forward of the grid side current. The control strategy contains no added additional sensors,which is simple in structure,low in cost and high in reliability. The system transfer function with the control strategy is derived and its implementation method is given. A MATLAB/Simulink simulation model is established to verify the feasibility and effectiveness of the proposed control strategy.