PWM整流器的模糊PI内模控制策略

PWM整流器模型中的非线性特性给控制器的设计带来一定的困难，且随着对整流器性能的要求日益提高，传统控制在性能上已难以令人满意。对此提出一种新的双闭环控制策略，电压外环采用模糊PI控制，电流内环采用内模控制。模糊PI控制使系统具有更快的动态响应和更小的超调，电流环内模控制解决控制器过分依赖精确数学模型的问题，提高电流环的抗扰性能，并简化了控制器设计。理论分析和仿真对比验证了所提控制策略的正确性和可行性。

Hybrid Fuzzy-PI and Internal Model Control Strategy for PWM Rectifier

The nonlinear character of PWM rectifiers makes the design of controller some difficult. Facing the increasing requirements of PWM rectifiers, the traditional controller couldn''t achieve satisfactory results. This paper proposed a new dual-loop control strategy with a hybrid fuzzy-PI voltage control as the outer-loop and an internal model current control as the inner-loop. The hybrid fuzzy-PI control makes the system have a faster responsiveness and a less overshoot, current loop adopting internal model control has solved the problem of excessive reliance on the precise mathematical model, improved the performance of anti-interference and simplified the design of controller. Theoretical analysis and simulation result has verified the correctness and feasibility of the control strategy presented.