并网逆变器电流跟踪复合控制的研究及实现

Research and Implement on the Combined Control for the Current Tracking in Grid-connected Inverter

在并网逆变器的电流跟踪控制中,针对无差拍控制对系统参数依赖性较大和鲁棒性较差的缺点,将无差拍控制和重复控制相结合的电流跟踪复合控制应用于具有有源滤波功能的并网逆变器。复合控制可解决无差拍控制在系统参数发生变化时电网电流存在周期性畸变的问题,提高了系统的稳态特性。此处对无差拍控制和重复控制进行了分析,通过仿真和实验结果证明了由该方法设计的逆变器具有动态响应快、适应负载能力强等优点。

Aiming at the dependence on the system parameters and poor robustness for the deadbeat control in grid- connected inverter current tracking control, a combined control is presented based on repetitive control and deadbeat control in the inverter which combines pbotovohaic grid-connected and active power filter.The combined control can eliminate the periodic distortion of the grid current when the system parameters changed and improve the steady state characteristics.The deadbeat control and the repetitive control are analyzed ,the simulation results and the experimental resuhs present that the combined control can improve the transient and steady state responses of the inverter perfectly.