移动式直流应急无线充电模块的磁芯优化设计研究

Research on the optimization design of magnetic core in DC emergency wireless power charging module

采用无线电能传输是开展移动式直流应急保障的有效途径。提出了一种适用于移动式直流应急无线充电模块的铁氧体磁芯设计和优化方法,可进一步提高发射器与接收器之间的未对准误差容限、降低磁芯损耗。当无线充电模块发射器与接收器之间存在未对准误差时,磁通密度不再均匀,磁芯损耗也随之增加。因而,应通过磁芯优化设计使得磁芯各处磁通均匀分布以及损耗降低。经综合考虑,提出了一种分段线性圆形和附加条形磁芯的优化结构,并提出基于有限元连续非线性规划优化算法,可使得磁通密度分布均匀和降低损耗。经仿真验证,与原始磁芯结构相比,优化后的圆形磁芯结构可降低单位体积磁芯损耗,另加附加条形磁芯优化后可使单位体积磁芯损耗降低39%,并且优化后的磁芯,单位损耗的磁芯体积可减少17. 5%。

This paper designs a perturbation observer based robust fractional-order PID control(PORF-PID)scheme to achieve the maximum power point tracking(MPPT)of photovoltaic(PV)inverters.Firstly,the nonlinearities,parameter uncertainties and un-modeled dynamics of PV inverter are aggregated into a perturbation,which is then estimated online by a sliding-mode perturbation observer(SMPO).In addition,the perturbation estimate is fully compensated in the real-time by a robust fractional-order PID control(FPID),so that a global control consistency could be realized in the presence of various operation conditions.Due to the utilization of fractional-order control framework,the additional controller parameters could further improve the dynamical responses of the closed-loop system.Two case studies are carried out,e.g.,solar irradiation variation and power grid voltage drop,to verify the effectiveness of the proposed approach.Simulation results demonstrate that PORF-PID control can achieve the fastest dynamical responses and the lowest overshoot in comparison to that of conventional PID control,FPID control,and feedback linearization control(FLC)under different operation conditions.