双向无线电能传输系统小体积副边补偿网络参数设计方法

Parameter design method of small-volume secondary compensation network for bi-directional wireless power transmission system

无线电能传输技术是21世纪以来人类最重要的应用科学技术至于,将其应用于电动汽车V2G领域具有重要的研究价值及实用价值。为了实现对于BD-WPT系统的补偿网络参数优化设计的问题,文章首先建立了应用LCC补偿网络的BD-WPT系统集中模型,进一步推导了流经补偿网络元件电流有效值表达式。通过对流经补偿网络元件电流有效值表达式进行分析可知,对于某一传输功率需求P0,若副边补偿电容Cs值越小,则流过副边补偿元件基波电流的有效值越小,且流过原边补偿元件基波电流的有效值越大。副边补偿电容Cs值越小,流过副边补偿元件基波电流有效值越小,均有利于减小副边补偿元件体积。补偿元件体积减小是电动汽车无线充电系统体积控制的重要环节,而平衡系统补偿网络元件承受的电流应力是降低总体元器件体积的前提,因此文章提出了一种以降低元器件承受的电流不平衡应力水平为目的的小体积副边补偿网络参数设计方法,并通过仿真验证了相关理论的正确性。

The wireless power transmission(WPT)technology is the most important applied science and technology since the 21st century,and its application to the V2G field of electric vehicles has both important research value and practical value.Aiming at the problem of designing the compensation network parameters of the WPT system,this paper firstly establishes the mathematical model of the WPT system utilizing the LCC compensation network,and derives the expression of the current RMS value of the flow compensation network component.By analyzing the current RMS expression of the component of compensation network,it can be known that for a certain transmission power demand P0,if the value of the secondary compensation capacitor Cs is smaller,the RMS value of the fundamental wave current flowing through the secondary compensation component is smaller.The RMS value of the fundamental current of the primary compensation component is larger.The smaller the value of the secondary side compensation capacitor Cs is,the smaller the effective value of the fundamental wave current flowing through the secondary compensation element is,which is beneficial to reduce the volume of the secondary compensation element.The reduction of compensation component volume is an important part of the volume control of electric vehicle wireless charging system.The balance between the current stress of the network component in system compensates is the premise of reducing the overall component volume.Therefore,this paper proposes the design method of small-volume secondary compensation network parameters for the purpose of balance stress level and current decrease.Meanwhile,the correctness of the relevant theory is verified by simulation.