基于LCL滤波器的单相光伏并网逆变控制器设计

摘要

详细叙述了基于LCL滤波器的单相光伏并网逆变器的电流双环控制策略，并对其稳定性进行了分析。为了减少电网电压波动对并网电流的影响，在控制系统中增加了电网电压前馈控制，并对电压前馈控制器进行了设计。此外，设计了电流内外环控制器的参数，通过仿真对控制系统的性能进行了验证。结果表明，设计的控制器能够有效减小入网电流的总谐波失真（THD），使并网逆变器稳定工作。%The double loop current control strategy of the grid-connected inverter with LCL filter is described in this paper. To suppress grid voltage fluctuations the grid voltage feed-forward control is added and then designed. In addition, parameters of the double loop current controller are designed. The simulation results show that, the designed controller is feasible and the total harmonic distortion (THD) of the grid current is reduced effectively.