基于模糊分数阶PIλDμ控制的AC/DC变换器

摘要

作为AC/DC电力变换装置的核心,控制系统控制效果的好坏直接影响电压输出波形的质量.为了进一步提高AC/DC电力变换装置的控制性能,增强系统的鲁棒性和稳态性,提出一种模糊控制与分数阶PIλ Dμ控制相结合的复合控制策略,并将其用于十二脉波整流电路的控制系统中.采用模糊控制器可以很好地实现对控制参数的自适应调整,分数阶PIλDμ控制器在非线性系统的控制过程中能够取得比整数阶PID控制器更好的控制效果.仿真和实验结果表明,改进后的控制器具有较强的灵活性和鲁棒性,稳态性和自适应能力得到增强,适用于非线性时变系统.%As the core of the AC/DC power conversion device,the control effect of the control system directly affects the quality of the output voltage waveform.In order to further improve the control performance of AC/ DC power conversion device,and enhance the system robustness and steady-state,a composite control strategy is proposed by combining fractional order PIλDμ control and fuzzy control,and applied to the control system of twelve-pulse rectifier circuit.Fuzzy controller can realize the adaptive adjustment of the control parameters,the fractional order PIλDμμ controller can achieve better control effect than the integer order PID controller in the control process of the nonlinear system.Simulation and experimental results show that the improved controller has strong flexibility and robustness,the steady state and adaptive ability are enhanced,which is suitable for nonlinear time-varying system.