基于模糊变论域的直流变换器改进自抗扰控制

Improved Active Disturbance Rejection Control of DC/DC Converter Based on Variable Universe Fuzzy Control

双向DC/DC变换器是微网的重要组成部分,针对直流负载存在较大扰动,传统控制策略稳压效果不佳的问题,提出基于模糊变论域的二自由度自抗扰控制(ADRC)。从频域角度将一阶线性自抗扰控制(LADRC)实现跟踪性和抗扰性完全解耦,结合变论域模糊控制实现控制器参数在线优化。通过频域理论分析所提控制器收敛性和抗扰性。通过硬件实验和重复实验表明,在简化调参难度和相同带宽的前提下,结合变论域的二自由度ADRC策略在抗扰性能和鲁棒性能上均优于传统控制策略。

Bidirectional DC/DC converter is an important part of the microgrid.To address the problem that the con-ventional control strategy is not effective in regulating the voltage when there are large disturbances in the DC load,a two-degree-of-freedom active disturbance rejection control(ADRC)is proposed based on the variable universe fuzzy con-trol.The first-order linear active disturbance rejection control(LADRC)is completely decoupled from the tracking and immunity from the frequency domain perspective,and the controller parameters are optimized online by combining the fuzzy control in the variable theory domain.The convergence and immunity of the proposed controller are analyzed by the frequency domain theory.The simulations and repeated experiments show that the two-degree-of-freedom ADRC strategy combined with variable universe fuzzy control outperforms the conventional control strategy in terms of anti-disturbance performance and robustness with the same bandwidth and simplified tuning difficulty.