混凝土介质中无线电能传输系统的效率分析及优化

运用无线电能传输技术将室外能量收集系统的能量无线传输到室内能量消耗系统可以减少对建筑物结构的破坏,能够实现绿色建筑与光伏发电技术的有机融合。但是,作为电介质的混凝土材料会对发射线圈与接收线圈间的互感产生影响,使得输入阻抗发生改变并最终导致系统传输效率的下降。以电路理论为基础,分析了混凝土介质对无线电能传输系统传输效率的影响,并且提出了基于阻抗匹配网络实现系统最优传输效率的优化策略。仿真结果表明,随着轴向距离的增加,混凝土介质对无线电能传输系统传输效率的抑制作用逐渐减小,同时由于阻抗匹配网络的加入,系统的传输性能得到明显的改善。最后通过实验验证理论的正确性,实现了针对混凝土介质中无线电能传输系统效率的优化,减少了理论研究与工程应用之间的差距。

基于MCR-WPT系统拓扑与负载匹配研究

针对在磁耦合谐振无线输电系统中,当负载类型和拓扑结构不完全匹配时,存在系统的输出功率会下降明显的问题,根据电路互感理论分析四种不同的拓扑结构模型,并利用Matlab分别对纯阻性负载、阻感性负载和阻容性负载进行仿真分析。得出当负载为纯阻性负载选用串联-串联结构、阻感性负载选用串联-并联结构、阻容性负载选用串联-串联结构进行匹配传输时系统可以获得最优功率的传输。所得结论对于深入研究无线电能传输技术奠定了基础,为设计不同负载时的传输系统提供了有益指导。

Garbage sorting and disposal in Japan and its implications to China

Beginning from Shanghai,and then Beijing,China has started its garbage sorting enforcement.Before 2025,all cities above the prefecture level will set up and perfect their garbage sorting and disposal system.As Japan is the most successful example in garbage sorting and disposal in the world,where garbage sorting is different district from district,we put our focus on a district Nerima district,in Tokyo about its garbage classification and daily practice.It eventually aims to draw implications for China’s garbage sorting and disposal.As residents,we Chinese people can also learn from the Japanese daily practice in garbage sorting.Only after the government builds a reasonable gathering and disposing system,residents absolutely shoulder the responsibility of sorting garbage,can we succeed in garbage sorting enforcement and environment protection.