摘要
针对无线电能传输系统因忽略逆变器与整流器损耗,仅考虑补偿网络最优负载,导致最大效率点偏移的问题,提出一种减小最优负载偏移的最大效率跟踪和恒压输出复合控制方法。首先,分析LCC-S型无线电能传输系统参数与各部分输出电压、电流之间的关系,建立非线性整流桥负载等效模型,揭示整流二极管压降对负载转换的影响机制。之后构建纳入逆变器和整流器损耗的系统效率量化模型,定量分析系统效率随负载变化的特性,对比仅考虑补偿网络损耗时的效率特性,减小最优负载偏移误差。同时,分析补偿元件参数变化对逆变器输出阻抗的影响,提出一种基于补偿电容参数优化的零电压开通实现方法。然后,在副边采用基于Buck-Boost电路的阻抗匹配技术进行最大效率跟踪控制,在原边增加一个Buck电路调节逆变器输入电压,实现输出电压稳定控制。最后,搭建实验平台对理论分析进行验证。实验结果表明,将逆变器与整流器损耗纳入整体系统效率分析后,系统仍然存在最大效率点,与传统方法相比,所提策略使最优负载偏移误差降低24.6%,最大效率提高1.1%,且在较宽的负载变化范围内实现逆变器零电压开通运行,整体系统效率能够保持在90%左右并实现恒压输出。
To address the issue of maximum efficiency point deviation in wireless power transfer systems caused by neglecting the losses of inverters and rectifiers,a composite control method combining maximum efficiency tracking and constant voltage output is proposed to reduce the optimal load deviation.Firstly,the relationship between the parameters of the LCC-S type wireless power transfer system and the output voltage and current of each component is analyzed.A nonlinear rectifier bridge load equivalent model is established to reveal the influence mechanism of rectifier diode voltage drop on load conversion.Subsequently,a system efficiency quantification model incorporating inverter and rectifier losses is constructed to quantitatively analyze the characteristics of system efficiency with load variation,thereby reducing the deviation error of the optimal load.Meanwhile,the optimization design of LCC-S compensation parameters enables zero-voltage switching operation of the inverter.Then,on the secondary side,an impedance matching technique based on a Buck-Boost circuit is employed for maximum efficiency tracking control,while a Buck circuit is added on the primary side to achieve stable output voltage control.Finally,an experimental platform is constructed to validate the theoretical analysis.Compared with traditional methods,the proposed strategy reduces optimal load deviation error by 24.6%,increases maximum efficiency by 1.1%,realizes zero-voltage turn-on operation of the inverter over a wide load range,and maintains overall system efficiency at approximately 90%with constant-voltage output.To address the issue of deviation in the maximum efficiency point in wireless power transfer systems,caused by overlooking losses in inverters and rectifiers,a composite control strategy is proposed.This strategy combines maximum efficiency tracking with constant voltage output to minimize the optimal load deviation.Initially,the relationship between the parameters of the LCC-S type wireless power transfer system and the output voltage and current of each component is analyzed.A nonlinear rectifier bridge load equivalent model is developed to understand the impact of rectifier diode voltage drops on load conversion.Next,a system efficiency quantification model that incorporates losses from both the inverter and rectifier is created to quantitatively analyze the system efficiency as the load varies,thus reducing the deviation error in the optimal load.Additionally,LCC-S compensation parameters are optimized to enable zero-voltage switching operation for the inverter.On the secondary side,an impedance matching technique based on a Buck-Boost circuit is implemented for maximum efficiency tracking,while a Buck circuit is employed on the primary side to ensure stable output voltage control.Finally,an experimental platform is built to validate the theoretical analysis.Compared to traditional methods,the proposed strategy reduces the optimal load deviation error by 24.6%,increases the maximum efficiency by 1.1%,enables zero-voltage turn-on operation of the inverter across a wide load range,and maintains an overall system efficiency of approximately 90%with constant voltage output.
作者
耿宇宇
陈华国
王涛
Geng Yuyu;Chen Huaguo;Wang Tao(School of Electrical and Electronic Engineering,Chongqing University of Technology,Chongqing 400054,China)
出处
《仪器仪表学报》
北大核心
2025年第4期23-34,共12页
Chinese Journal of Scientific Instrument
基金
重庆市自然科学基金面上项目(CSTB2023NSCQ-MSX0261)
重庆市教委科学技术研究项目(KJQN202401156)资助。
关键词
无线电能传输
最优负载偏移
非线性整流桥负载
最大效率追踪
补偿参数优化
wireless power transfer
optimal load offset
nonlinear bridge load
maximum efficiency tracking
compensation parameter optimization
