【摘要】 目的 解决汽车充电桩中DC/DC变换器在负载受到扰动时容易出现输出电压波动大、动态响应时间慢的问题.方法 在建立DC/DC变换器小信号数学模型的前提下,提出一种基于模糊自抗扰控制的DC/DC变换器控制方法.首先,基于扫频法获取变换器低阶等效模型.其次,利用模型参数信息来改进扩张状态观测器的系数矩阵,实时估计并补偿变换器控制系统受到的总扰动.最后,引入模糊控制对线性自抗扰控制器的参数进行在线调整.结果 仿真结果表明,在负载变化条件下,采用模糊自抗扰控制器的变换器输出电压峰值更小,恢复时间更短,动态响应优于PI控制器.结论 相比PI控制策略,模糊自抗扰控制策略能有效增强变换器系统的抗扰能力,提升动态性能,更好地稳定电压.更多还原

【Abstract】 Objective In order to solve the problems of DC/DC converter in vehicle charging pile,which is prone to large output voltage fluctuation and slow dynamic response time when the load is perturbed.Methods Under the premise of establishing a small-signal mathematical model of DC/DC converter,a DC/DC converter control method based on fuzzy active disturbance rejection controller is proposed.Firstly,the low-order equivalent model of the converter is obtained based on the sweep method.Secondly,the model parameter information is utilized to improve the coefficient matrix of the dilated state observer to estimate and compensate the total perturbation to the converter control system in real time.Fuzzy logic control is then introduced to adjust the parameters of the linear active disturbance rejection controller online.Results Simulation results show that under the load variation conditions,the converter with fuzzy self-immunity controller has smaller output voltage peaks,shorter recovery time,and better dynamic response than the PI controller.Conclusion Compared with the PI control strategy,the fuzzy self-immunity control strategy can effectively enhance the immunity of the converter system,improve the dynamic performance,and improve the voltage stability.更多还原