中文摘要：

电网供电的电力电子变压器在抑制电压跌落,突升以及波动闪变干扰等电能质量问题时动态响应速度慢,调节效果不佳。针对上述问题,提出了一种采用模糊PI控制的双闭环控制方法。首先建立电子变压器的数学模型。然后运用模糊控制原理设计模糊控制器,对系统输入级电压外环的PI控制器参数进行实时调节。最后利用Matlab/Simulink搭建了系统仿真模型,编写了相应的模糊控制算法,并对PI与模糊PI控制的仿真结果进行对比分析。结果表明,模糊控制策略提高了系统动态响应特性与直流母线电压的稳定性,并验证了双环控制方法的可行性与有效性。

英文摘要：

A double closed- loop control method is proposed based on fuzzy PI controller. In this method,a mathematical model is developed first. Then,a fuzzy control theory is applied to design the fuzzy controller which is used to adjust the parameters of the input level PI controller. The simulation model of the electronic transformer system is built as well as the fuzzy control algorithm based on Matlab / Simulink software,and the simulation results of PI and fuzzy PI are compared and analyzed. The results show that the dynamic response characteristic of the system and the stability of the dc bus voltage are improved by the proposed method. The simulation results show the feasibility and effectiveness of the design method.