基于模糊PI参数自整定和重复控制的三相逆变器并网研究∗

摘要

According to the limitations of traditional PI control, a new control strategy to control three-phase inverter was proposed, which was formed by fuzzy PI control and repetitive control in parallel. And the new method can not only improved the system’s compensation accuracy but also enhance the steady quality of grid connected current. The controller took advantage of fuzzy control to adjust the PI parameters online according to the error, so as to meet the requirements of optimal performance. The zero steady state error of repetitive control could ensure the steady state accuracy of system. Finally, through the simulation experiment, the new strategy, PI control and PI control combined with repetitive control were compared to prove the feasibility of proposed method.%针对传统PI控制的局限性，提出一种新的控制策略，即利用基于模糊PI控制器与重复控制器并联构成的控制方法对三相并网逆变器进行控制，提高系统的补偿精度和并网电流稳态质量。该控制器利用模糊控制技术，根据误差大小对PI参数进行实时在线调整，从而满足最优的性能要求。利用重复控制的零稳态误差能力保证系统的稳态精度。最后通过仿真研究，对新控制策略、PI控制以及PI与重复控制结合三种控制策略比较，结果证实所提出的方法可行。