针对感应电能传输(inductive power transfer,IPT)系统多负载条件下能量传输效率问题研究频率与效率的关系,并从系统能量流动的角度解释效率特性。为了验证最大传输效率结论的正确性,采用双工作模式切换的电流调节方法和离散准滑模控制...针对感应电能传输(inductive power transfer,IPT)系统多负载条件下能量传输效率问题研究频率与效率的关系,并从系统能量流动的角度解释效率特性。为了验证最大传输效率结论的正确性,采用双工作模式切换的电流调节方法和离散准滑模控制策略来维持原边谐振电流(激磁电流)的恒定。基于系统能量平衡函数关系,建立关于激磁电流峰值包络的系统离散变结构模型,构建具有重置积分环节的切换函数来改善系统的稳态响应。实验结果表明,当工作频率偏离副边固有谐振频率时,系统效率最大,合理的积分增益可以使系统具有较好的控制性能,对于负载大范围变化具有较强的鲁棒性,如当负载完全拿开时,控制器经过时长约为5 ms的调节,激磁电流最终稳定在参考值,表现出较好的抗扰动性,且系统效率均保持90%以上。展开更多
A novel discrete-time reaching law was proposed for uncertain discrete-time system,which contained process noise and measurement noise.The proposed method reserves all the advantages of discrete-time reaching law,whic...A novel discrete-time reaching law was proposed for uncertain discrete-time system,which contained process noise and measurement noise.The proposed method reserves all the advantages of discrete-time reaching law,which not only decreases the band width of sliding mode and strengthens the system robustness,but also improves the dynamic performance and stability capability of the system.Moreover,a discrete-time sliding mode control strategy based on Kalman filter method was designed,and Kalman filter was employed to eliminate the influence of system noise.Simulation results show that there is no chattering phenomenon in the output of controller and the state variables of controlled system,and the proposed algorithm is also feasible and has strong robustness to external disturbances.展开更多
文摘针对感应电能传输(inductive power transfer,IPT)系统多负载条件下能量传输效率问题研究频率与效率的关系,并从系统能量流动的角度解释效率特性。为了验证最大传输效率结论的正确性,采用双工作模式切换的电流调节方法和离散准滑模控制策略来维持原边谐振电流(激磁电流)的恒定。基于系统能量平衡函数关系,建立关于激磁电流峰值包络的系统离散变结构模型,构建具有重置积分环节的切换函数来改善系统的稳态响应。实验结果表明,当工作频率偏离副边固有谐振频率时,系统效率最大,合理的积分增益可以使系统具有较好的控制性能,对于负载大范围变化具有较强的鲁棒性,如当负载完全拿开时,控制器经过时长约为5 ms的调节,激磁电流最终稳定在参考值,表现出较好的抗扰动性,且系统效率均保持90%以上。
基金Project(50721063) supported by the National Natural Science Foundation of China
文摘A novel discrete-time reaching law was proposed for uncertain discrete-time system,which contained process noise and measurement noise.The proposed method reserves all the advantages of discrete-time reaching law,which not only decreases the band width of sliding mode and strengthens the system robustness,but also improves the dynamic performance and stability capability of the system.Moreover,a discrete-time sliding mode control strategy based on Kalman filter method was designed,and Kalman filter was employed to eliminate the influence of system noise.Simulation results show that there is no chattering phenomenon in the output of controller and the state variables of controlled system,and the proposed algorithm is also feasible and has strong robustness to external disturbances.