DC-DC变换器母线电压的模糊自抗扰控制策略

Fuzzy Active Disturbance Rejection Control Strategy for DC Bus Voltage of DC-DC ConvertersLIU Zheng1,WANG Xilu1,WANG Qinglian2,Cheng Peishi3

摘要:

针对双向DC-DC变换器直流母线侧电压波动大和抗扰能力弱等问题，设计了一种基于模糊控制的二阶线性自抗扰控制策略；该策略采用常规的双闭环控制，电流内环采用PI控制，电压外环采用二阶线性自抗扰控制；通过引入模糊控制整定线性自抗扰控制的参数，实现线性扩张状态观测器和线性误差反馈控制律参数的自适应优化；通过对三种工况进行仿真，结果表明所提出的控制策略在提升DC-DC变换器直流母线电压的跟踪能力和抗扰能力方面的有效性。

Abstract:

Aiming at issues such as large DC bus voltage fluctuations and weak anti-disturbance capability in bidirectional DC-DC converters, a second-order linear active disturbance rejection control strategy based on fuzzy control is designed; this strategy adopts conventional double closed-loop control, with the inner current loop using PI control and the outer voltage loop using second-order linear active disturbance rejection control; by introducing fuzzy control to adjust the parameters of linear active disturbance rejection control, adaptive optimization of the parameters for the linear extended state observer and linear error feedback control law is achieved; through simulations of three operating conditions, the results show the effectiveness of the proposed control strategy in improving the tracking capability and anti-disturbance capability of the DC-DC converter's DC bus voltage.