A nonlinear pressure controller was presented to track desired feeding pressure for the cutter feeding system(CFS) of trench cutter(TC) in the presence of unknown external disturbances.The feeding pressure control of ...A nonlinear pressure controller was presented to track desired feeding pressure for the cutter feeding system(CFS) of trench cutter(TC) in the presence of unknown external disturbances.The feeding pressure control of CFS is subjected to unknown load characteristics of rock or soil; in addition,the geological condition is time-varying.Due to the complex load characteristics of rock or soil,the feeding velocity of TC is related to geological conditions.What is worse,its dynamic model is subjected to uncertainties and its function is unknown.To deal with the particular characteristics of CFS,a novel adaptive fuzzy integral sliding mode control(AFISMC) was designed for feeding pressure control of CFS,which combines the robust characteristics of an integral sliding mode controller and the adaptive adjusting characteristics of an adaptive fuzzy controller.The AFISMC feeding pressure controller is synthesized using the backstepping technique.The stability of the overall closed-loop system consisting of the adaptive fuzzy inference system,integral sliding mode controller and the cutter feeding system is proved using Lyapunov theory.Experiments are conducted on a TC test bench with the AFISMC under different operating conditions.The experimental results demonstrate that the proposed AFISMC feeding pressure controller for CFS gives a superior and robust pressure tracking performance with maximum pressure tracking error within ?0.3 MPa.展开更多
双向DC-DC变换器是新能源汽车混合动力系统的关键部件,为解决传统比例积分控制下双向DC-DC变换器在动态响应速度与抗干扰能力方面的不足,设计了一种基于前馈变结构比例积分控制(Feedforward Sliding Mode PI Control,FSMPI)的双向DC-DC...双向DC-DC变换器是新能源汽车混合动力系统的关键部件,为解决传统比例积分控制下双向DC-DC变换器在动态响应速度与抗干扰能力方面的不足,设计了一种基于前馈变结构比例积分控制(Feedforward Sliding Mode PI Control,FSMPI)的双向DC-DC变换器控制策略.该策略利用变结构控制对干扰信号的实时信息进行补偿,并结合前馈控制,以增强系统的鲁棒性.为验证所提控制策略的有效性,通过仿真与STM32F4实验平台上的对比实验,评估了其与传统比例积分控制的性能差异.结果表明,在负载变化时,采用前馈变结构比例积分控制的变换器具有更好的动态性能和鲁棒性.展开更多
针对直流配电网中母线电压控制问题,在双向AC/DC变换器传统双闭环控制器的基础上,设计一种基于扩张状态观测器（extended state observer,ESO）和终端滑模的非线性鲁棒电流前馈控制器,在不需要增加额外电压/电流传感器的情况下实现对系...针对直流配电网中母线电压控制问题,在双向AC/DC变换器传统双闭环控制器的基础上,设计一种基于扩张状态观测器（extended state observer,ESO）和终端滑模的非线性鲁棒电流前馈控制器,在不需要增加额外电压/电流传感器的情况下实现对系统内扰动的快速跟踪,有利于直流配电网中分布式电源与负荷的扩展和即插即用。传统电流前馈控制需要多个电流传感器采集负载电流信息,利用ESO与终端滑模控制理论将电流前馈控制系统转变为以直流母线电压为输入信号的非线性鲁棒电流前馈控制器,有效避免额外传感器的加入,减少装置费用,并且ESO可对系统各状态以及系统模型的不确定性和外部扰动进行实时跟踪,实现对系统中母线电压波动的快速抑制。软件数值仿真结果表明,该控制器表现出良好的控制效果和鲁棒性,对于直流母线电压波动具有很好的稳定效果。展开更多
基金Project(2012AA041801)supported by the High-tech Research and Development Program of China
文摘A nonlinear pressure controller was presented to track desired feeding pressure for the cutter feeding system(CFS) of trench cutter(TC) in the presence of unknown external disturbances.The feeding pressure control of CFS is subjected to unknown load characteristics of rock or soil; in addition,the geological condition is time-varying.Due to the complex load characteristics of rock or soil,the feeding velocity of TC is related to geological conditions.What is worse,its dynamic model is subjected to uncertainties and its function is unknown.To deal with the particular characteristics of CFS,a novel adaptive fuzzy integral sliding mode control(AFISMC) was designed for feeding pressure control of CFS,which combines the robust characteristics of an integral sliding mode controller and the adaptive adjusting characteristics of an adaptive fuzzy controller.The AFISMC feeding pressure controller is synthesized using the backstepping technique.The stability of the overall closed-loop system consisting of the adaptive fuzzy inference system,integral sliding mode controller and the cutter feeding system is proved using Lyapunov theory.Experiments are conducted on a TC test bench with the AFISMC under different operating conditions.The experimental results demonstrate that the proposed AFISMC feeding pressure controller for CFS gives a superior and robust pressure tracking performance with maximum pressure tracking error within ?0.3 MPa.
文摘双向DC-DC变换器是新能源汽车混合动力系统的关键部件,为解决传统比例积分控制下双向DC-DC变换器在动态响应速度与抗干扰能力方面的不足,设计了一种基于前馈变结构比例积分控制(Feedforward Sliding Mode PI Control,FSMPI)的双向DC-DC变换器控制策略.该策略利用变结构控制对干扰信号的实时信息进行补偿,并结合前馈控制,以增强系统的鲁棒性.为验证所提控制策略的有效性,通过仿真与STM32F4实验平台上的对比实验,评估了其与传统比例积分控制的性能差异.结果表明,在负载变化时,采用前馈变结构比例积分控制的变换器具有更好的动态性能和鲁棒性.
文摘针对直流配电网中母线电压控制问题,在双向AC/DC变换器传统双闭环控制器的基础上,设计一种基于扩张状态观测器（extended state observer,ESO）和终端滑模的非线性鲁棒电流前馈控制器,在不需要增加额外电压/电流传感器的情况下实现对系统内扰动的快速跟踪,有利于直流配电网中分布式电源与负荷的扩展和即插即用。传统电流前馈控制需要多个电流传感器采集负载电流信息,利用ESO与终端滑模控制理论将电流前馈控制系统转变为以直流母线电压为输入信号的非线性鲁棒电流前馈控制器,有效避免额外传感器的加入,减少装置费用,并且ESO可对系统各状态以及系统模型的不确定性和外部扰动进行实时跟踪,实现对系统中母线电压波动的快速抑制。软件数值仿真结果表明,该控制器表现出良好的控制效果和鲁棒性,对于直流母线电压波动具有很好的稳定效果。
