中文摘要：

提出一种模糊PI智能控制方法,使得Buck电路在负荷波动时稳定输出,其中PI控制的初始值来源于直流变换器Buck电路的传递函数模型,根据该小信号模型优化PI控制及模糊变量的论域,当负载波动时,系统有稳定的输出电压、稳态误差小且有很好的鲁棒性,很好地应对了负载波动对该直流变换器输出电压的影响。最后以仿真实验证实了该方法较传统PI控制有更好的动态性能和稳定性,具有一定的实际价值。

英文摘要：

A new fuzzy PI control method was proposed to deal with the load fluctuation in the Buck circuit , in which the initial value of the PI controll came from the transfer function model of the Buck circuit of the DC converter .Ac-cording to the optimal PI control of the small signal model and the discourse domain of the fuzzy variable , when there is a load fluctuation , the output voltage of the system could stay stable with tiny steady-state error and good robust , which perfectly deals with the influence of the load fluctuation on the output voltage of the DC converter .Finally simu-lation tests verified that compared with the traditional PI control , this method had better dynamic performance and sta-bility, and had certain practical values .