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。

Efficiency Analysis and Optimization of Wireless Power Transfer System in Concrete

Green building and photovoltaic power generation technology could be organically integrated by wireless power transfer technology which transmits energy from outdoor energy collection system to indoor energy consumption system. However, concrete as a dielectric material affected the mutual inductance between the transmitting coil and the receiving coil, which changes the input impedance and ultimately lead to the decrease of the transmission efficiency of the system. This paper based on the circuit theory analyzed the influence of concrete medium on the transmission efficiency, and proposed an optimization strategy based on impedance matching network to achieve the optimal transmission efficiency. The simulation results show that the restraint effect of concrete medium on the transmission efficiency decreases gradually with the increase of the axial distance. The transmission performance is improved obviously due to the addition of impedance matching network. Finally, the correctness of theory is verified by experiments. It realized the optimization of the efficiency in concrete medium, and reduced the gap between theoretical research and engineering application.